52 results on '"Nguyen Bich Ngoc"'
Search Results
2. Computational Pathology: A Survey Review and The Way Forward
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Hosseini, Mahdi S., Bejnordi, Babak Ehteshami, Trinh, Vincent Quoc-Huy, Hasan, Danial, Li, Xingwen, Kim, Taehyo, Zhang, Haochen, Wu, Theodore, Chinniah, Kajanan, Maghsoudlou, Sina, Zhang, Ryan, Yang, Stephen, Zhu, Jiadai, Chan, Lyndon, Khaki, Samir, Buin, Andrei, Chaji, Fatemeh, Salehi, Ala, Luna, Alejandra Zambrano, Nguyen, Bich Ngoc, Samaras, Dimitris, and Plataniotis, Konstantinos N.
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FOS: Computer and information sciences ,Computer Vision and Pattern Recognition (cs.CV) ,Image and Video Processing (eess.IV) ,Computer Science - Computer Vision and Pattern Recognition ,FOS: Electrical engineering, electronic engineering, information engineering ,Electrical Engineering and Systems Science - Image and Video Processing - Abstract
Computational Pathology (CoPath) is an interdisciplinary science that augments developments of computational approaches to analyze and model medical histopathology images. The main objective for CoPath is to develop infrastructure and workflows of digital diagnostics as an assistive CAD system for clinical pathology facilitating transformational changes in the diagnosis and treatment of cancer diseases. With evergrowing developments in deep learning and computer vision algorithms, and the ease of the data flow from digital pathology, currently CoPath is witnessing a paradigm shift. Despite the sheer volume of engineering and scientific works being introduced for cancer image analysis, there is still a considerable gap of adopting and integrating these algorithms in clinical practice. This raises a significant question regarding the direction and trends that are undertaken in CoPath. In this article we provide a comprehensive review of more than 700 papers to address the challenges faced in problem design all-the-way to the application and implementation viewpoints. We have catalogued each paper into a model-card by examining the key works and challenges faced to layout the current landscape in CoPath. We hope this helps the community to locate relevant works and facilitate understanding of the field's future directions. In a nutshell, we oversee the CoPath developments in cycle of stages which are required to be cohesively linked together to address the challenges associated with such multidisciplinary science. We overview this cycle from different perspectives of data-centric, model-centric, and application-centric problems. We finally sketch remaining challenges and provide directions for future technical developments and clinical integration of CoPath.
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- 2023
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3. Discovering Novel Bioactivities of Controversial Food Additives by Means of Simple Zebrafish Embryotoxicity (ZET) Assays
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Dinh Duy-Thanh, Nguyen Bich-Ngoc, François Van den Bossche, Nguyen Lai-Thanh, and Marc Muller
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Chemical Health and Safety ,food additives ,bioactivities ,zebrafish ,embryos ,food safety ,developmental toxicology ,Health, Toxicology and Mutagenesis ,Toxicology - Abstract
The rising concerns about controversial food additives’ potential hazardous properties require extensive yet animal-minimized testing strategies. Zebrafish embryos are the ideal in vivo model representing both human and environmental health. In this study, we exposed zebrafish embryos to eight controversial food additives. Our results indicate that Sodium Benzoate is a Cat.3 aquatic toxicant, while Quinoline Yellow is a strong teratogen. At high concentrations, non-toxic chemicals induced similar phenotypes, suggesting the impact of ionic strength and the applicability of the darkened yolk phenotype as an indicator of nephrotoxicity. Three food additives showed unpredicted bioactivities on the zebrafish embryos: Brilliant Blue could weaken the embryonic yolk, Quinoline Yellow may interfere with nutrient metabolism, and Azorubine induced precocious zebrafish hatching. In conclusion, the zebrafish embryo is ideal for high throughput chemical safety and toxicity screening, allowing systematic detection of biological effects—especially those unexpected by targeted in vitro and in silico models. Additionally, our data suggest the need to reconsider the safety status of food additives Quinoline Yellow, Brilliant Blue, Sodium Benzoate, and other controversial food additives in further studies, as well as pave the way to further applications based on the newly found properties of Brilliant Blue and Azorubine.
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- 2022
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4. LAND USER SATISFACTION WITH PUBLIC ADMINISTRATIVE SERVICES AT LAND REGISTRATION OFFICE BRANCH IN BINH SON DISTRICT, QUANG NGAI PROVINCE
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Ho Viet Hoang, Le Thao Nguyen, Tran Thi Phuong, and Nguyen Bich Ngoc
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General Medicine - Abstract
Land user satisfaction is one of the essential factors reflecting the quality of public administrative services provided by state administrative agencies. The study is based on a survey of 164 people using public administrative services at the Branch in 2018–2020. Exploratory Factor Analysis and Multivariate Regression Analysis indicate that six factors affect user satisfaction: Reliability, Responsiveness, Competence of staff, Processes and procedures, Tangibility, and Service Attitude. Reliability has the most significant influence, while Service Attitude is the lowest. The study has also proposed several solutions to improve the quality of the land services at the Branch.
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- 2022
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5. Academic Entrepreneurship: An Empirical Research of Invention Commercialisation
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Duong Cong Doanh, Nguyen Thanh Hieu, Nguyen Bich Ngoc, Tomasz Bernat, and Nguyen Thi Phuong Linh
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Entrepreneurship ,business.industry ,Strategy and Management ,05 social sciences ,Theory of planned behavior ,Public relations ,Empirical research ,Conceptual framework ,Management of Technology and Innovation ,0502 economics and business ,Normative ,050211 marketing ,Business and International Management ,Invention ,Emerging markets ,Institutional theory ,Psychology ,business ,050203 business & management - Abstract
Empirical studies exploring particular mechanisms that the country’s institutional profile, such as regulatory and normative dimensions are internalised into scientists’ cognitive process of commercialising their research results, are rather sparse. This study aims to develop a conceptual framework in which integrated the lens of institutional theory and theory of planned behaviour to empirically test and discover the effects of regulatory and normative supports on scientists’ intention to commercialise an invention. A survey was conducted at institutions and universities using stratified random sampling from 255 scientists during the period of 2 months from May to July 2020. Structural equation modelling was employed to estimate the paths and correlations. Results revealed that although regulatory support was not found to have a direct role in shaping intention to commercialise the invention, it had more influences and significances in the increase of attitude towards entrepreneurship, subjective norms, perceived behavioural control. Also, attitude towards entrepreneurship and perceived behavioural control were found to be full mediators in the linkage between regulatory support and intention to commercialise the invention, but subjective norms were not. Besides, normative support, although it was not related to subjective norms, it had direct influences on attitude toward invention commercialisation, perceived behaviour control, and intention to commercialise the invention. Thus, attitude toward invention commercialisation, perceived behaviour control was figured out to play a partially mediating role in the relationship between normative support and intention to commercialise invention among scientists. This research shows that new institutions that address younger generations and concentrate on enhancing entrepreneurial qualities are crucial to foster commercialisation in emerging economies. Also, by representing outstanding issues, our research encourages further debate and research activities. Implications for Central European audience: Even though the research results are related to academic entrepreneurship in Vietnam, the findings of this study can advocate that to promote academic entrepreneurship in emerging economies, enhancing both regulatory and normative supports are really necessary. In addition to theoretical contributions, this study also has several practical implications for researchers and policymakers in Central Europe.
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- 2021
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6. BUILDING REASONABLE AGRICULTURAL LAND-USE STRUCTURE WITH OPTIMAL MATHEMATICAL MODEL
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Ho Viet Hoang, Tran Thi Phuong, Nguyen Hong Mai, and Nguyen Bich Ngoc
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General Medicine - Abstract
This study applies the optimal mathematical model to develop a rational agricultural land-use structure that brings economic, social, and environmental benefits to Que Son district, Quang Nam province. We utilized the method of focus group discussions and household interviews. One hundred and twenty-five households directly engaging in agricultural production in five communes of the district participated in the study. The model was used to build the agricultural land-use structure with the following conditions: limiting the cultivated area, ensuring food security, and guaranteeing labour in the agriculture sector. The results indicate that Que Son district needs to reduce 29.1 ha for peanuts and 8.8 ha for vegetable cultivation while increasing 387.6 ha for maize, 190.1 ha for sweet potato, and 190.1 ha for sesame cultivation.
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- 2022
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7. The Application of Geographical Information Systems and the Analytic Hierarchy Process in Selecting Sustainable Areas for Urban Green Spaces: A Case Study in Hue City, Vietnam
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Nguyen Hoang Khanh Linh, Pham Gia Tung, Huynh Van Chuong, Nguyen Bich Ngoc, and Tran Thi Phuong
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Atmospheric Science ,analytic hierarchy process ,land evaluation ,Hue City ,urban green space - Abstract
In recent years, there has been growing awareness about the roles and benefits of urban green spaces (UGSs), particularly in the context of mitigating the negative effects of climate change, which have become increasingly serious. In Vietnam, the government has allocated considerable resources to the development of UGSs in many cities. However, regarding implementation, UGS development in Vietnam faces many challenges; many cities find it difficult to meet the set criterion regarding the number of green spaces per capita. This research was conducted in Hue City, which is known as one of the greenest cities in Vietnam. The results show that there are twenty-one UGSs in Hue City (with a total area of 88.67 ha). These are located primarily along the Huong River and around the Hue Imperial Citadel. However, under government stipulations, the current number of UGSs is not considered sufficient in proportion to the local population, and will not accommodate the future growth of the population. We applied the analytic hierarchy process (AHP) along with the participation of local residents, using six criteria to map potential areas for future UGS planning. In this, the distance from existing residential areas to potential UGS locations is the most important criterion. The suitability map identified 684 hectares of Hue City as highly suitable for UGSs. This research also proposes a scenario for UGS planning in Hue based on retaining the existing green spaces combined with creating another 35 green spaces, comprising a total area of 167 hectares. This is to meet the needs of local residents by 2030.
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- 2022
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8. FACTORS AFFECTING EFFICIENCY OF AGRICULTURAL LAND-USE MODEL
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Nguyen Bich Ngoc, Ho Viet Hoang, Mai Thi Khanh Van, Le Ngoc Phuong Quy, and Tran Thi Phuong
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General Medicine - Abstract
This research identifies and analyzes factors affecting the efficiency of agricultural land-use models in Hai Lang district, Quang Tri province, with logistic regression. The sample size is 98 households applying and not applying sustainable agricultural land-use models in Hai Ba, Hai Duong, and Hai Que communes. The results show that education level and income affect the application of land-use models. Besides, the agricultural land is used relatively reasonably. The land-use models reflect sustainability but are not entirely consistent with theory.
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- 2022
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9. B-fields in Star-forming Region Observations (BISTRO): Magnetic Fields in the Filamentary Structures of Serpens Main
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Woojin Kwon, Kate Pattle, Sarah Sadavoy, Charles L. H. Hull, Doug Johnstone, Derek Ward-Thompson, James Di Francesco, Patrick M. Koch, Ray Furuya, Yasuo Doi, Valentin J. M. Le Gouellec, Jihye Hwang, A-Ran Lyo, Archana Soam, Xindi Tang, Thiem Hoang, Florian Kirchschlager, Chakali Eswaraiah, Lapo Fanciullo, Kyoung Hee Kim, Takashi Onaka, Vera Könyves, Ji-hyun Kang, Chang Won Lee, Motohide Tamura, Pierre Bastien, Tetsuo Hasegawa, Shih-Ping Lai, Keping Qiu, David Berry, Doris Arzoumanian, Tyler L. Bourke, Do-Young Byun, Wen Ping Chen, Huei-Ru Vivien Chen, Mike Chen, Zhiwei Chen, Tao-Chung Ching, Jungyeon Cho, Yunhee Choi, Minho Choi, Antonio Chrysostomou, Eun Jung Chung, Simon Coudé, Sophia Dai, Pham Ngoc Diep, Yan Duan, Hao-Yuan Duan, David Eden, Jason Fiege, Laura M. Fissel, Erica Franzmann, Per Friberg, Rachel Friesen, Gary Fuller, Tim Gledhill, Sarah Graves, Jane Greaves, Matt Griffin, Qilao Gu, Ilseung Han, Jennifer Hatchell, Saeko Hayashi, Martin Houde, Tsuyoshi Inoue, Shu-ichiro Inutsuka, Kazunari Iwasaki, Il-Gyo Jeong, Miju Kang, Janik Karoly, Akimasa Kataoka, Koji Kawabata, Francisca Kemper, Kee-Tae Kim, Gwanjeong Kim, Mi-Ryang Kim, Shinyoung Kim, Jongsoo Kim, Jason Kirk, Masato I. N. Kobayashi, Takayoshi Kusune, Jungmi Kwon, Kevin Lacaille, Chi-Yan Law, Chin-Fei Lee, Yong-Hee Lee, Hyeseung Lee, Jeong-Eun Lee, Sang-Sung Lee, Dalei Li, Di Li, Hua-bai Li, Sheng-Jun Lin, Sheng-Yuan Liu, Hong-Li Liu, Junhao Liu, Tie Liu, Xing Lu, Steve Mairs, Masafumi Matsumura, Brenda Matthews, Gerald Moriarty-Schieven, Tetsuya Nagata, Fumitaka Nakamura, Hiroyuki Nakanishi, Nguyen Bich Ngoc, Nagayoshi Ohashi, Geumsook Park, Harriet Parsons, Nicolas Peretto, Felix Priestley, Tae-Soo Pyo, Lei Qian, Ramprasad Rao, Jonathan Rawlings, Mark G. Rawlings, Brendan Retter, John Richer, Andrew Rigby, Hiro Saito, Giorgio Savini, Masumichi Seta, Yoshito Shimajiri, Hiroko Shinnaga, Mehrnoosh Tahani, Ya-Wen Tang, Kohji Tomisaka, Le Ngoc Tram, Yusuke Tsukamoto, Serena Viti, Hongchi Wang, Jia-Wei Wang, Anthony Whitworth, Jintai Wu, Jinjin Xie, Hsi-Wei Yen, Hyunju Yoo, Jinghua Yuan, Hyeong-Sik Yun, Tetsuya Zenko, Yapeng Zhang, Chuan-Peng Zhang, Guoyin Zhang, Jianjun Zhou, Lei Zhu, Ilse de Looze, Philippe André, C. Darren Dowell, Stewart Eyres, Sam Falle, Jean-François Robitaille, Sven van Loo, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), Centre National d'Études Spatiales [Toulouse] (CNES)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ), and Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France -Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France
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POLARIZATION ,FOS: Physical sciences ,F500 ,IMAGING POLARIMETRY ,1ST ,INTERSTELLAR CLOUDS ,Astrophysics::Solar and Stellar Astrophysics ,SCUBA-2 ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astrophysics::Galaxy Astrophysics ,[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] ,LEGACY ,Astronomy and Astrophysics ,VELOCITY ,Astrophysics - Astrophysics of Galaxies ,SPITZER ,Astrophysics - Solar and Stellar Astrophysics ,Physics and Astronomy ,Space and Planetary Science ,[SDU]Sciences of the Universe [physics] ,OUTFLOWS ,Astrophysics of Galaxies (astro-ph.GA) ,STRENGTHS - Abstract
We present 850 $��$m polarimetric observations toward the Serpens Main molecular cloud obtained using the POL-2 polarimeter on the James Clerk Maxwell Telescope (JCMT) as part of the B-fields In STar-forming Region Observations (BISTRO) survey. These observations probe the magnetic field morphology of the Serpens Main molecular cloud on about 6000 au scales, which consists of cores and six filaments with different physical properties such as density and star formation activity. Using the histogram of relative orientation (HRO) technique, we find that magnetic fields are parallel to filaments in less dense filamentary structures where $N_{H_2} < 0.93\times 10^{22}$ cm$^{-2}$ (magnetic fields perpendicular to density gradients), while being perpendicular to filaments (magnetic fields parallel to density gradients) in dense filamentary structures with star formation activity. Moreover, applying the HRO technique to denser core regions, we find that magnetic field orientations change to become perpendicular to density gradients again at $N_{H_2} \approx 4.6 \times 10^{22}$ cm$^{-2}$. This can be interpreted as a signature of core formation. At $N_{H_2} \approx 16 \times 10^{22}$ cm$^{-2}$ magnetic fields change back to being parallel to density gradients once again, which can be understood to be due to magnetic fields being dragged in by infalling material. In addition, we estimate the magnetic field strengths of the filaments ($B_{POS} = 60-300~��$G)) using the Davis-Chandrasekhar-Fermi method and discuss whether the filaments are gravitationally unstable based on magnetic field and turbulence energy densities., 18 pages, accepted for publication in ApJ
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- 2022
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10. Modeling Extinction and Reddening Effects by Circumstellar Dust in the Betelgeuse Envelope in the Presence of Radiative Torque Disruption
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Bao Truong, Le Ngoc Tram, Thiem Hoang, Nguyen Chau Giang, Pham Ngoc Diep, Dieu D. Nguyen, Nguyen Thi Phuong, Thuong D. Hoang, Nguyen Bich Ngoc, Nguyen Fuda, Hien Phan, Tuan Van Bui, Centre de Recherche Astrophysique de Lyon (CRAL), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
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FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Circumstellar matter ,Extinction ,Astrophysics - Astrophysics of Galaxies ,Circumstellar envelopes ,Red supergiant stars ,Circumstellar dust ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,[SDU]Sciences of the Universe [physics] ,Astrophysics of Galaxies (astro-ph.GA) ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics::Galaxy Astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) - Abstract
Circumstellar dust is formed and evolved within the envelope of evolved stars, including Asymptotic Giant Branch (AGB) and Red Supergiant (RSG). The extinction of stellar light by circumstellar dust is vital for interpreting RSG/AGB observations and determining high-mass RSG progenitors of core-collapse supernovae. Nevertheless, circumstellar dust properties are not well understood. Modern understanding of dust evolution suggests that intense stellar radiation can radically change the dust properties across the circumstellar envelope through the RAdiative Torque Disruption (RAT-D) mechanism. In this paper, we study the impacts of RAT-D on the grain size distribution (GSD) of circumstellar dust and model its effects on photometric observations of $\alpha$ Orionis (Betelgeuse). Due to the RAT-D effects, large grains formed in the dust formation zone are disrupted into smaller species of size $a < 0.5\,\rm\mu m$. Using the GSD constrained by the RAT-D effects, we model the visual extinction of background stars and Betelgeuse. We find that the extinction decreases at near-UV, optical, and infrared wavelengths while increasing at far-UV wavelengths. The resulting flux potentially reproduces the observation from the near-UV to near-IR range. Our results can be used to explain dust extinction and photometric observations toward other RSG/AGB stars., Comment: 21 pages, 18 figures, 2 tables, accepted to ApJ
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- 2022
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11. The JCMT BISTRO-2 survey : magnetic fields of the massive DR21 filament
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Tao-Chung Ching, Keping Qiu, Di Li, Zhiyuan Ren, Shih-Ping Lai, David Berry, Kate Pattle, Ray Furuya, Derek Ward-Thompson, Doug Johnstone, Patrick M. Koch, Chang Won Lee, Thiem Hoang, Tetsuo Hasegawa, Woojin Kwon, Pierre Bastien, Chakali Eswaraiah, Jia-Wei Wang, Kyoung Hee Kim, Jihye Hwang, Archana Soam, A-Ran Lyo, Junhao Liu, Valentin J. M. Le Gouellec, Doris Arzoumanian, Anthony Whitworth, James Di Francesco, Frédérick Poidevin, Tie Liu, Simon Coudé, Mehrnoosh Tahani, Hong-Li Liu, Takashi Onaka, Dalei Li, Motohide Tamura, Zhiwei Chen, Xindi Tang, Florian Kirchschlager, Tyler L. Bourke, Do-Young Byun, Mike Chen, Huei-Ru Vivien Chen, Wen Ping Chen, Jungyeon Cho, Yunhee Choi, Youngwoo Choi, Minho Choi, Antonio Chrysostomou, Eun Jung Chung, Y. Sophia Dai, Pham Ngoc Diep, Yasuo Doi, Yan Duan, Hao-Yuan Duan, David Eden, Lapo Fanciullo, Jason Fiege, Laura M. Fissel, Erica Franzmann, Per Friberg, Rachel Friesen, Gary Fuller, Tim Gledhill, Sarah Graves, Jane Greaves, Matt Griffin, Qilao Gu, Ilseung Han, Saeko Hayashi, Martin Houde, Charles L. H. Hull, Tsuyoshi Inoue, Shu-ichiro Inutsuka, Kazunari Iwasaki, Il-Gyo Jeong, Vera Könyves, Ji-hyun Kang, Miju Kang, Janik Karoly, Akimasa Kataoka, Koji Kawabata, Francisca Kemper, Jongsoo Kim, Mi-Ryang Kim, Shinyoung Kim, Hyosung Kim, Kee-Tae Kim, Gwanjeong Kim, Jason Kirk, Masato I. N. Kobayashi, Takayoshi Kusune, Jungmi Kwon, Kevin Lacaille, Chi-Yan Law, Sang-Sung Lee, Hyeseung Lee, Jeong-Eun Lee, Chin-Fei Lee, Yong-Hee Lee, Guangxing Li, Hua-bai Li, Sheng-Jun Lin, Sheng-Yuan Liu, Xing Lu, Steve Mairs, Masafumi Matsumura, Brenda Matthews, Gerald Moriarty-Schieven, Tetsuya Nagata, Fumitaka Nakamura, Hiroyuki Nakanishi, Nguyen Bich Ngoc, Nagayoshi Ohashi, Geumsook Park, Harriet Parsons, Nicolas Peretto, Felix Priestley, Tae-Soo Pyo, Lei Qian, Ramprasad Rao, Mark Rawlings, Jonathan Rawlings, Brendan Retter, John Richer, Andrew Rigby, Sarah Sadavoy, Hiro Saito, Giorgio Savini, Masumichi Seta, Yoshito Shimajiri, Hiroko Shinnaga, Ya-Wen Tang, Kohji Tomisaka, Le Ngoc Tram, Yusuke Tsukamoto, Serena Viti, Hongchi Wang, Jintai Wu, Jinjin Xie, Meng-Zhe Yang, Hsi-Wei Yen, Hyunju Yoo, Jinghua Yuan, Hyeong-Sik Yun, Tetsuya Zenko, Chuan-Peng Zhang, Yapeng Zhang, Guoyin Zhang, Jianjun Zhou, Lei Zhu, Ilse de Looze, Philippe André, C. Darren Dowell, Stewart Eyres, Sam Falle, Jean-François Robitaille, Sven van Loo, National Natural Science Foundation of China, Chinese Academy of Sciences, Natural Sciences and Engineering Research Council of Canada, Ministerio de Ciencia, Innovación y Universidades (España), National Research Foundation of Korea, National Research, Japan Society for the Promotion of Science, Agencia Estatal de Investigación (España), Ching, Tao-Chung [0000-0001-8516-2532], Qiu, Keping [0000-0002-5093-5088], Li, Di [0000-0003-3010-7661], Ren, Zhiyuan [0000-0003-4659-1742], Lai, Shih-Ping [0000-0001-5522-486X], Berry, David [0000-0001-6524-2447], Pattle, Kate [0000-0002-8557-3582], Furuya, Ray [0000-0003-0646-8782], Ward-Thompson, Derek [0000-0003-1140-2761], Johnstone, Doug [0000-0002-6773-459X], Koch, Patrick M [0000-0003-2777-5861], Lee, Chang Won [0000-0002-3179-6334], Hoang, Thiem [0000-0003-2017-0982], Hasegawa, Tetsuo [0000-0003-1853-0184], Kwon, Woojin [0000-0003-4022-4132], Bastien, Pierre [0000-0002-0794-3859], Eswaraiah, Chakali [0000-0003-4761-6139], Wang, Jia-Wei [0000-0002-6668-974X], Kim, Kyoung Hee [0000-0001-9597-7196], Hwang, Jihye [0000-0001-7866-2686], Soam, Archana [0000-0002-6386-2906], Lyo, A-Ran [0000-0002-9907-8427], Liu, Junhao [0000-0002-4774-2998], Le Gouellec, Valentin JM [0000-0002-5714-799X], Arzoumanian, Doris [0000-0002-1959-7201], Whitworth, Anthony [0000-0002-1178-5486], Francesco, James Di [0000-0002-9289-2450], Poidevin, Frédérick [0000-0002-5391-5568], Liu, Tie [0000-0002-5286-2564], Coudé, Simon [0000-0002-0859-0805], Tahani, Mehrnoosh [0000-0001-8749-1436], Liu, Hong-Li [0000-0003-3343-9645], Onaka, Takashi [0000-0002-8234-6747], Tamura, Motohide [0000-0002-6510-0681], Chen, Zhiwei [0000-0003-0849-0692], Tang, Xindi [0000-0002-4154-4309], Kirchschlager, Florian [0000-0002-3036-0184], Bourke, Tyler L [0000-0001-7491-0048], Byun, Do-Young [0000-0003-1157-4109], Chen, Huei-Ru Vivien [0000-0002-9774-1846], Chen, Wen Ping [0000-0003-0262-272X], Cho, Jungyeon [0000-0003-1725-4376], Chrysostomou, Antonio [0000-0002-9583-8644], Chung, Eun Jung [0000-0003-0014-1527], Dai, Y Sophia [0000-0002-7928-416X], Diep, Pham Ngoc [0000-0002-2808-0888], Doi, Yasuo [0000-0001-8746-6548], Duan, Hao-Yuan [0000-0002-7022-4742], Eden, David [0000-0002-5881-3229], Fanciullo, Lapo [0000-0001-9930-9240], Fissel, Laura M [0000-0002-4666-609X], Franzmann, Erica [0000-0003-2142-0357], Friberg, Per [0000-0002-8010-8454], Friesen, Rachel [0000-0001-7594-8128], Fuller, Gary [0000-0001-8509-1818], Gledhill, Tim [0000-0002-2859-4600], Graves, Sarah [0000-0001-9361-5781], Greaves, Jane [0000-0002-3133-413X], Gu, Qilao [0000-0002-2826-1902], Hayashi, Saeko [0000-0001-5026-490X], Houde, Martin [0000-0003-4420-8674], Hull, Charles LH [0000-0002-8975-7573], Inoue, Tsuyoshi [0000-0002-7935-8771], Inutsuka, Shu-ichiro [0000-0003-4366-6518], Jeong, Il-Gyo [0000-0002-5492-6832], Könyves, Vera [0000-0002-3746-1498], Kang, Ji-hyun [0000-0001-7379-6263], Kang, Miju [0000-0002-5016-050X], Karoly, Janik [0000-0001-5996-3600], Kataoka, Akimasa [0000-0003-4562-4119], Kawabata, Koji [0000-0001-6099-9539], Kemper, Francisca [0000-0003-2743-8240], Kim, Jongsoo [0000-0002-1229-0426], Kim, Shinyoung [0000-0001-9333-5608], Kim, Kee-Tae [0000-0003-2412-7092], Kim, Gwanjeong [0000-0003-2011-8172], Kirk, Jason [0000-0002-4552-7477], Kobayashi, Masato IN [0000-0003-3990-1204], Kusune, Takayoshi [0000-0002-9218-9319], Kwon, Jungmi [0000-0003-2815-7774], Lacaille, Kevin [0000-0001-9870-5663], Law, Chi-Yan [0000-0003-1964-970X], Lee, Sang-Sung [0000-0002-6269-594X], Lee, Hyeseung [0000-0003-3465-3213], Lee, Jeong-Eun [0000-0003-3119-2087], Lee, Chin-Fei [0000-0002-3024-5864], Lee, Yong-Hee [0000-0001-6047-701X], Li, Guangxing [0000-0003-3144-1952], Li, Hua-bai [0000-0003-2641-9240], Lin, Sheng-Jun [0000-0002-6868-4483], Liu, Sheng-Yuan [0000-0003-4603-7119], Lu, Xing [0000-0003-2619-9305], Mairs, Steve [0000-0002-6956-0730], Matsumura, Masafumi [0000-0002-6906-0103], Matthews, Brenda [0000-0003-3017-9577], Moriarty-Schieven, Gerald [0000-0002-0393-7822], Nagata, Tetsuya [0000-0001-9264-9015], Nakamura, Fumitaka [0000-0001-5431-2294], Ngoc, Nguyen Bich [0000-0002-5913-5554], Ohashi, Nagayoshi [0000-0003-0998-5064], Park, Geumsook [0000-0001-8467-3736], Parsons, Harriet [0000-0002-6327-3423], Pyo, Tae-Soo [0000-0002-3273-0804], Qian, Lei [0000-0003-0597-0957], Rao, Ramprasad [0000-0002-1407-7944], Rawlings, Mark [0000-0002-6529-202X], Rawlings, Jonathan [0000-0001-5560-1303], Richer, John [0000-0002-9693-6860], Rigby, Andrew [0000-0002-3351-2200], Savini, Giorgio [0000-0003-4449-9416], Shimajiri, Yoshito [0000-0001-9368-3143], Shinnaga, Hiroko [0000-0001-9407-6775], Tang, Ya-Wen [0000-0002-0675-276X], Tomisaka, Kohji [0000-0003-2726-0892], Tram, Le Ngoc [0000-0002-6488-8227], Viti, Serena [0000-0001-8504-8844], Wang, Hongchi [0000-0003-0746-7968], Wu, Jintai [0000-0001-7276-3590], Xie, Jinjin [0000-0002-2738-146X], Yen, Hsi-Wei [0000-0003-1412-893X], Yoo, Hyunju [0000-0002-8578-1728], Yun, Hyeong-Sik [0000-0001-6842-1555], Zhang, Chuan-Peng [0000-0002-4428-3183], Zhang, Yapeng [0000-0002-5102-2096], Zhou, Jianjun [0000-0003-0356-818X], André, Philippe [0000-0002-3413-2293], Falle, Sam [0000-0002-9829-0426], Robitaille, Jean-François [0000-0001-5079-8573], van Loo, Sven [0000-0003-4746-8500], and Apollo - University of Cambridge Repository
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STAR-FORMING REGIONS ,SUBMILLIMETER POLARIZATION ,HERSCHEL ,FOS: Physical sciences ,Astronomy and Astrophysics ,MU-M POLARIZATION ,MOLECULAR CLOUD ,Astrophysics - Astrophysics of Galaxies ,1ST ,Astrophysics - Solar and Stellar Astrophysics ,Physics and Astronomy ,5101 Astronomical Sciences ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,SCUBA-2 ,GOULD BELT SURVEY ,DUST EMISSION ,51 Physical Sciences ,Solar and Stellar Astrophysics (astro-ph.SR) ,FAR-INFRARED POLARIMETRY - Abstract
Tao-Chung Ching et al., We present 850 μm dust polarization observations of the massive DR21 filament from the B-fields In STar-forming Region Observations (BISTRO) survey, using the POL-2 polarimeter and the SCUBA-2 camera on the James Clerk Maxwell Telescope. We detect ordered magnetic fields perpendicular to the parsec-scale ridge of the DR21 main filament. In the subfilaments, the magnetic fields are mainly parallel to the filamentary structures and smoothly connect to the magnetic fields of the main filament. We compare the POL-2 and Planck dust polarization observations to study the magnetic field structures of the DR21 filament on 0.1–10 pc scales. The magnetic fields revealed in the Planck data are well-aligned with those of the POL-2 data, indicating a smooth variation of magnetic fields from large to small scales. The plane-of-sky magnetic field strengths derived from angular dispersion functions of dust polarization are 0.6–1.0 mG in the DR21 filament and ∼0.1 mG in the surrounding ambient gas. The mass-to-flux ratios are found to be magnetically supercritical in the filament and slightly subcritical to nearly critical in the ambient gas. The alignment between column density structures and magnetic fields changes from random alignment in the low-density ambient gas probed by Planck to mostly perpendicular in the high-density main filament probed by James Clerk Maxwell Telescope. The magnetic field structures of the DR21 filament are in agreement with MHD simulations of a strongly magnetized medium, suggesting that magnetic fields play an important role in shaping the DR21 main filament and subfilaments., This work is supported by National Natural Science Foundation of China (NSFC) grant Nos. 11988101, U1931117, 11725313, and 12073061 and the CAS International Partnership Program of Chinese Academy of Sciences grant No. 114A11KYSB20160008. T.-C.C. is funded by Chinese Academy of Sciences Taiwan Young Talent Program grant No. 2018TW2JB0002. T.-C.C. and C.E. were supported by Special Funding for Advanced Users, budgeted and administrated by Center for Astronomical Mega-Science (CAMS), Chinese Academy of Sciences. K.P. is a Royal Society University Research Fellow, supported by grant No. URF\R1\211322. D.J. is supported by the National Research Council of Canada and by a Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant. P.M.K. is supported by the Ministry of Science and Technology (MoST) in Taiwan through grants 109-2112-M-001-022 and 110-2112-M-001-057. C.W.L. is supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2019R1A2C1010851), and by the Korea Astronomy and Space Science Institute grant funded by the Korea government (MSIT; Project No. 2022-1-840-05). T.H. is supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) through the Mid-career Research Program (2019R1A2C1087045). W.K. was supported by the NRF grant funded by the MSIT (2021R1F1A1061794). C.E. acknowledges the financial support from grant RJF/2020/000071 as a part of Ramanujan Fellowship awarded by the Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Govt. of India. F.P. acknowledges support from the Spanish State Research Agency (AEI) under grant No. PID2019-105552RB-C43. M.T. is supported by JSPS KAKENHI grant Nos. 18H05442, 15H02063, and 22000005. J.K. is supported by JSPS KAKENHI grant No. 19K14775. L.F. and F.K. acknowledge the support by the MoST in Taiwan through grant 107-2119-M-001-031-MY3 and Academia Sinica through grant AS-IA-106-M03. L.F. acknowledges the support by the MoST in Taiwan through grants 111-2811-M-005-007 and 109-2112-M-005-003-MY3. C.L.H.H. acknowledges the support of the NAOJ Fellowship and JSPS KAKENHI grants 18K13586 and 20K14527. F.K. is supported by the Spanish program Unidad de Excelencia María de Maeztu CEX2020-001058-M, financed by MCIN/AEI/10.13039/501100011033. K.Q. is partially supported by National Key R&D Program of China No. 2022YFA1603100, and acknowledges the National Natural Science Foundation of China (NSFC) grant U1731237. S.P.L. acknowledges grants from the Ministry of Science and Technology of Taiwan 106-2119-M-007-021-MY3 and 109-2112-M-007-010-MY3. Y.D. acknowledges the support of JSPS KAKENHI grants 25247016 and 18H01250. Y.S.D. is supported by the National Key R&D Program of China for grant No. 2022YFA1605300, and NSFC grants Nos. 12273051, 11933003.
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- 2022
12. The JCMT BISTRO survey: A spiral magnetic field in a hub-filament structure, monoceros R2
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Jihye Hwang, Jongsoo Kim, Kate Pattle, Chang Won Lee, Patrick M. Koch, Doug Johnstone, Kohji Tomisaka, Anthony Whitworth, Ray S. Furuya, Ji-hyun Kang, A-Ran Lyo, Eun Jung Chung, Doris Arzoumanian, Geumsook Park, Woojin Kwon, Shinyoung Kim, Motohide Tamura, Jungmi Kwon, Archana Soam, Ilseung Han, Thiem Hoang, Kyoung Hee Kim, Takashi Onaka, Chakali Eswaraiah, Derek Ward-Thompson, Hong-Li Liu, Xindi Tang, Wen Ping Chen, Masafumi Matsumura, Thuong Duc Hoang, Zhiwei Chen, Valentin J. M. Le Gouellec, Florian Kirchschlager, Frédérick Poidevin, Pierre Bastien, Keping Qiu, Tetsuo Hasegawa, Shih-Ping Lai, Do-Young Byun, Jungyeon Cho, Minho Choi, Youngwoo Choi, Yunhee Choi, Il-Gyo Jeong, Miju Kang, Hyosung Kim, Kee-Tae Kim, Jeong-Eun Lee, Sang-Sung Lee, Yong-Hee Lee, Hyeseung Lee, Mi-Ryang Kim, Hyunju Yoo, Hyeong-Sik Yun, Mike Chen, James Di Francesco, Jason Fiege, Laura M. Fissel, Erica Franzmann, Martin Houde, Kevin Lacaille, Brenda Matthews, Sarah Sadavoy, Gerald Moriarty-Schieven, Mehrnoosh Tahani, Tao-Chung Ching, Y. Sophia Dai, Yan Duan, Qilao Gu, Chi-Yan Law, Dalei Li, Di Li, Guangxing Li, Hua-bai Li, Tie Liu, Xing Lu, Lei Qian, Hongchi Wang, Jintai Wu, Jinjin Xie, Jinghua Yuan, Chuan-Peng Zhang, Guoyin Zhang, Yapeng Zhang, Jianjun Zhou, Lei Zhu, David Berry, Per Friberg, Sarah Graves, Junhao Liu, Steve Mairs, Harriet Parsons, Mark Rawlings, Yasuo Doi, Saeko Hayashi, Charles L. H. Hull, Tsuyoshi Inoue, Shu-ichiro Inutsuka, Kazunari Iwasaki, Akimasa Kataoka, Koji Kawabata, Gwanjeong Kim, Masato I. N. Kobayashi, Tetsuya Nagata, Fumitaka Nakamura, Hiroyuki Nakanishi, Tae-Soo Pyo, Hiro Saito, Masumichi Seta, Yoshito Shimajiri, Hiroko Shinnaga, Yusuke Tsukamoto, Tetsuya Zenko, Huei-Ru Vivien Chen, Hao-Yuan Duan, Lapo Fanciullo, Francisca Kemper, Chin-Fei Lee, Sheng-Jun Lin, Sheng-Yuan Liu, Nagayoshi Ohashi, Ramprasad Rao, Ya-Wen Tang, Jia-Wei Wang, Meng-Zhe Yang, Hsi-Wei Yen, Tyler L. Bourke, Antonio Chrysostomou, Victor Debattista, David Eden, Stewart Eyres, Sam Falle, Gary Fuller, Tim Gledhill, Jane Greaves, Matt Griffin, Jennifer Hatchell, Janik Karoly, Jason Kirk, Vera Könyves, Steven Longmore, Sven van Loo, Ilse de Looze, Nicolas Peretto, Felix Priestley, Jonathan Rawlings, Brendan Retter, John Richer, Andrew Rigby, Giorgio Savini, Anna Scaife, Serena Viti, Pham Ngoc Diep, Nguyen Bich Ngoc, Le Ngoc Tram, Philippe André, Simon Coudé, C. Darren Dowell, Rachel Friesen, Jean-Franćois Robitaille, National Research Foundation of Korea, Japan Society for the Promotion of Science, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), and National Science Foundation (US)
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POLARIZATION ,CLOUDS ,FOS: Physical sciences ,Astronomy and Astrophysics ,REGIONS ,Astrophysics - Astrophysics of Galaxies ,1ST ,DENSE CORES ,MODEL ,Physics and Astronomy ,GRAVITY ,POL-2 ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,SCUBA-2 - Abstract
Hwang et al., We present and analyze observations of polarized dust emission at 850 μm toward the central 1 × 1 pc hub-filament structure of Monoceros R2 (Mon R2). The data are obtained with SCUBA-2/POL-2 on the James Clerk Maxwell Telescope (JCMT) as part of the B-fields in Star-forming Region Observations survey. The orientations of the magnetic field follow the spiral structure of Mon R2, which are well described by an axisymmetric magnetic field model. We estimate the turbulent component of the magnetic field using the angle difference between our observations and the best-fit model of the underlying large-scale mean magnetic field. This estimate is used to calculate the magnetic field strength using the Davis–Chandrasekhar–Fermi method, for which we also obtain the distribution of volume density and velocity dispersion using a column density map derived from Herschel data and the C18O (J = 3 − 2) data taken with HARP on the JCMT, respectively. We make maps of magnetic field strengths and mass-to-flux ratios, finding that magnetic field strengths vary from 0.02 to 3.64 mG with a mean value of 1.0 ± 0.06 mG, and the mean critical mass-to-flux ratio is 0.47 ± 0.02. Additionally, the mean Alfvén Mach number is 0.35 ± 0.01. This suggests that, in Mon R2, the magnetic fields provide resistance against large-scale gravitational collapse, and the magnetic pressure exceeds the turbulent pressure. We also investigate the properties of each filament in Mon R2. Most of the filaments are aligned along the magnetic field direction and are magnetically subcritical., J.H. is supported by the University of Science and Technology (UST) Overseas Training Program 2022, funded by the University of Science and Technology, Korea (No. 2022-017). K.P. is a Royal Society University Research Fellow, supported by grant number URF\R1\211322. C.W.L. was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF- 2019R1A2C1010851), and by the Korea Astronomy and Space Science Institute grant funded by the Korea government (MSIT; Project No. 2022-1-840-05). D.J. and J.d.F. are supported by the National Research Council of Canada and by Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grants. G.P. is supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF; 2020R1A6A3A01100208) W.K. was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT; NRF-2021R1F1A1061794). M.T. is supported by JSPS KAKENHI grant Nos. 18H05442, 15H02063, and 22000005. J.K. is supported by JSPS KAKENHI grant No. 19K14775. M.M. is supported by JSPS KAKENHI grant No. 20K03276. F.P. acknowledges support from the Spanish State Research Agency Agencia Estatal de Investigación (AEI) under grant number PID2019-105552RB-C43. S.P.L., H.Y.D., S.J.L., and M.Z.Y. acknowledge grants from the Ministry of Science and Technology of Taiwan 106-2119-M-007-021-MY3 and 109-2112-M-007-010-MY3. C.E. acknowledges the financial support from grant RJF/2020/000071 as a part of a Ramanujan Fellowship awarded by Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Govt. of India. L.F. and F.K. acknowledge support from the Ministry of Science and Technology of Taiwan, under grant No. MoST107-2119-M-001-031- MY3 and from Academia Sinica under grant No. AS-IA-106-M03. L.F. acknowledges the support by the MoST in Taiwan through grants 111-2811-M-005-007 and 109-2112-M-005-003-MY3. F.K. acknowledges support from the Spanish program Unidad de Excelencia María de Maeztu CEX2020-001058-M, financed by MCIN/AEI/10.13039/501100011033. Y.S.D. would like to acknowledge the support from NSFC grants 12273051 and 10878003. M.R. is supported by the international Gemini Observatory, a program of NSFs NOIRLab, which is managed by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation, on behalf of the Gemini partnership of Argentina, Brazil, Canada, Chile, the Republic of Korea, and the United States of America. The JCMT is operated by the East Asian Observatory on behalf of The National Astronomical Observatory of Japan; Academia Sinica Institute of Astronomy and Astrophysics; the Korea Astronomy and Space Science Institute; the Operation, Maintenance and Upgrading Fund for Astronomical Telescopes and Facility Instruments, budgeted from the Ministry of Finance of China. Additional funding support is provided by the Science and Technology Facilities Council of the United Kingdom and participating universities and organizations in the United Kingdom, Canada, and Ireland. Additional funds for the construction of SCUBA-2 were provided by the Canada Foundation for Innovation.
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- 2022
13. Oxidative Treatment of Rhodamine B Solution on CoOx/sepiolite Catalysts
- Author
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Thao Nguyen Tien, Nguyen Bich Ngoc, Dang Van Long, and Nguyen Thi Nhu
- Subjects
chemistry.chemical_compound ,chemistry ,Oxidative treatment ,Sepiolite ,Rhodamine B ,Catalysis ,Nuclear chemistry - Abstract
Sepiolite loaded with different cobalt oxide contents has been prepared by the precipitation method followed by calcination at 410ºC. The synthesized Co-loaded samples were characterized by physical methods using XRD, SEM, BET, and H2-TPR. The obtained solids have a large specific area and good distribution of cobalt oxide nanoparticles on sepiolite carrier. The catalysts were tested for the oxidative removal of rhodamine B solution and found that 1.0-3.0 wt.% cobalt ion/sepiolite samples exhibited the highest decoloration efficiency of rhodamine B (88-90%) in the presence of hydrogen peroxide at room temperature after the treatment of 30 mg/L of RhB solution in 210 minutes.
- Published
- 2020
- Full Text
- View/download PDF
14. Development of the generation of alkyl radicals from N-tosyloxaziridines
- Author
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Nguyen Bich Ngoc and Cao Hai Thuong
- Subjects
Gerontology ,Chemistry ,Life satisfaction ,Alkyl radicals - Published
- 2019
- Full Text
- View/download PDF
15. Contributions of Rotation, Expansion and Line Broadening to the Morphology and Kinematics of the Inner CSE of Oxygen-rich AGB Star R Hya
- Author
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Pham Tuyet Nhung, Do Thi Hoai, Pierre Darriulat, Pham Ngoc Diep, Nguyen Bich Ngoc, Tran Thi Thai, and Pham Tuan-Anh
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Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,Astrophysics::Solar and Stellar Astrophysics ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics - Astrophysics of Galaxies ,Astrophysics::Galaxy Astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) - Abstract
We use archival ALMA observations of the CO(2-1) and SiO(5-4) molecular line emissions of AGB star R Hya to illustrate the relative contributions of rotation, expansion and line broadening to the morphology and kinematics of the circumstellar envelope (CSE) within some ~70 au (~0.5 arcsec) from the centre of the star. We give evidence for rotation and important line broadening to dominate the inner region, within ~14 au (~100 mas) from the centre of the star. The former is about an axis that projects a few degrees west of north and has a projected rotation velocity of a few km/s. The latter occurs within some 7-14 au (50-100 mas) from the centre of the star, the line width reaching two to three times its value outside this region. We suggest that it is caused by shocks induced by stellar pulsations and convective cell granulation. We show the importance of properly accounting for the observed line broadening when discussing rotation and evaluating the radial dependence of the rotation velocity., 9 pages, 8 figures
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- 2022
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- View/download PDF
16. The JCMT BISTRO Survey: An 850/450$\mu$m Polarization Study of NGC 2071IR in OrionB
- Author
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A-Ran Lyo, Jongsoo Kim, Sarah Sadavoy, Doug Johnstone, David Berry, Kate Pattle, Woojin Kwon, Pierre Bastien, Takashi Onaka, James Di Francesco, Ji-Hyun Kang, Ray Furuya, Charles L. H. Hull, Motohide Tamura, Patrick M. Koch, Derek Ward-Thompson, Tetsuo Hasegawa, Thiem Hoang, Doris Arzoumanian, Chang Won Lee, Chin-Fei Lee, Do-Young Byun, Florian Kirchschlager, Yasuo Doi, Kee-Tae Kim, Jihye Hwang, Pham Ngoc Diep, Lapo Fanciullo, Sang-Sung Lee, Geumsook Park, Hyunju Yoo, Eun Jung Chung, Anthony Whitworth, Steve Mairs, Archana Soam, Tie Liu, Xindi Tang, Simon Coudé, Philippe André, Tyler L. Bourke, Huei-Ru Vivien Chen, Zhiwei Chen, Wen Ping Chen, Mike Chen, Tao-Chung Ching, Jungyeon Cho, Minho Choi, Yunhee Choi, Antonio Chrysostomou, Sophia Dai, C. Darren Dowell, Hao-Yuan Duan, Yan Duan, David Eden, Chakali Eswaraiah, Stewart Eyres, Jason Fiege, Laura M. Fissel, Erica Franzmann, Per Friberg, Rachel Friesen, Gary Fuller, Tim Gledhill, Sarah Graves, Jane Greaves, Matt Griffin, Qilao Gu, Ilseung Han, Jannifer Hatchell, Saeko Hayashi, Martin Houde, Tsuyoshi Inoue, Shu-ichiro Inutsuka, Kazunari Iwasaki, Il-Gyo Jeong, Miju Kang, Akimasa Kataoka, Koji Kawabata, Francisca Kemper, Gwanjeong Kim, Mi-Ryang Kim, Shinyoung Kim, Kyoung Hee Kim, Jason Kirk, Masato I. N. Kobayashi, Vera Könyves, Takayoshi Kusune, Jungmi Kwon, Kevin Lacaille, Shih-Ping Lai, Chi-Yan Law, Jeong-Eun Lee, Yong-Hee Lee, Hyeseung Lee, Dalei Li, Di Li, Hua-Bai Li, Hong-Li Liu, Junhao Liu, Sheng-Yuan Liu, Xing Lu, Masafumi Matsumura, Brenda Matthews, Gerald Moriarty-Schieven, Tetsuya Nagata, Fumitaka Nakamura, Hiroyuki Nakanishi, Nguyen Bich Ngoc, Nagayoshi Ohashi, Harriet Parsons, Nicolas Peretto, Felix Priestley, Tae-soo Pyo, Lei Qian, Keping Qiu, Ramprasad Rao, Jonathan Rawlings, Mark G. Rawlings, Brendan Retter, John Richer, Andrew Rigby, Hiro Saito, Giorgio Savini, Anna Scaife, Masumichi Seta, Yoshito Shimajiri, Hiroko Shinnaga, Mehrnoosh Tahani, Ya-Wen Tang, Kohji Tomisaka, Le Ngoc Tram, Yusuke Tsukamoto, Serena Viti, Jia-Wei Wang, Hongchi Wang, Jinjin Xie, Hsi-Wei Yen, Jinghua Yuan, Hyeong-Sik Yun, Tetsuya Zenko, Guoyin Zhang, Chuan-Peng Zhang, Yapeng Zhang, Jianjun Zhou, Lei Zhu, Ilse de Looze, Sam Falle, Jean-François Robitaille, Sven van Loo, Lyo, A-Ran [0000-0002-9907-8427], Kim, Jongsoo [0000-0002-1229-0426], Johnstone, Doug [0000-0002-6773-459X], Pattle, Kate [0000-0002-8557-3582], Kwon, Woojin [0000-0003-4022-4132], Bastien, Pierre [0000-0002-0794-3859], Onaka, Takashi [0000-0002-8234-6747], Kang, Ji-Hyun [0000-0001-7379-6263], Furuya, Ray [0000-0003-0646-8782], Hull, Charles L. H. [0000-0002-8975-7573], Tamura, Motohide [0000-0002-6510-0681], Koch, Patrick M. [0000-0003-2777-5861], Ward-Thompson, Derek [0000-0003-1140-2761], Hoang, Thiem [0000-0003-2017-0982], Arzoumanian, Doris [0000-0002-1959-7201], Lee, Chin-Fei [0000-0002-3024-5864], Byun, Do-Young [0000-0003-1157-4109], Kirchschlager, Florian [0000-0002-3036-0184], Doi, Yasuo [0000-0001-8746-6548], Kim, Kee-Tae [0000-0003-2412-7092], Hwang, Jihye [0000-0001-7866-2686], Lee, Sang-Sung [0000-0002-6269-594X], Park, Geumsook [0000-0001-8467-3736], Yoo, Hyunju [0000-0002-8578-1728], Chung, Eun Jung [0000-0003-0014-1527], Mairs, Steve [0000-0002-6956-0730], Soam, Archana [0000-0002-6386-2906], Liu, Tie [0000-0002-5286-2564], Tang, Xindi [0000-0002-4154-4309], Coudé, Simon [0000-0002-0859-0805], André, Philippe [0000-0002-3413-2293], Bourke, Tyler L. [0000-0001-7491-0048], Chen, Zhiwei [0000-0003-0849-0692], Ping Chen, Wen [0000-0002-5519-0628], Ching, Tao-Chung [0000-0001-8516-2532], Cho, Jungyeon [0000-0003-1725-4376], Chrysostomou, Antonio [0000-0002-9583-8644], Eden, David [0000-0002-5881-3229], Franzmann, Erica [0000-0003-2142-0357], Friberg, Per [0000-0002-8010-8454], Friesen, Rachel [0000-0001-7594-8128], Fuller, Gary [0000-0001-8509-1818], Gledhill, Tim [0000-0002-2859-4600], Graves, Sarah [0000-0001-9361-5781], Gu, Qilao [0000-0002-2826-1902], Hatchell, Jannifer [0000-0002-4870-2760], Houde, Martin [0000-0003-4420-8674], Inoue, Tsuyoshi [0000-0002-7935-8771], Inutsuka, Shu-ichiro [0000-0003-4366-6518], Iwasaki, Kazunari [0000-0002-2707-7548], Kang, Miju [0000-0002-5016-050X], Kataoka, Akimasa [0000-0003-4562-4119], Kawabata, Koji [0000-0001-6099-9539], Kemper, Francisca [0000-0003-2743-8240], Kim, Gwanjeong [0000-0003-2011-8172], Kim, Mi-Ryang [0000-0002-1408-7747], Kim, Shinyoung [0000-0001-9333-5608], Kirk, Jason [0000-0002-4552-7477], Kobayashi, Masato I. N. [0000-0003-3990-1204], Könyves, Vera [0000-0002-3746-1498], Kusune, Takayoshi [0000-0002-9218-9319], Kwon, Jungmi [0000-0003-2815-7774], Lacaille, Kevin [0000-0001-9870-5663], Lai, Shih-Ping [0000-0001-5522-486X], Law, Chi-Yan [0000-0003-1964-970X], Lee, Jeong-Eun [0000-0003-3119-2087], Lee, Yong-Hee [0000-0001-6047-701X], Lee, Hyeseung [0000-0003-3465-3213], Li, Di [0000-0003-3010-7661], Li, Hua-Bai [0000-0003-2641-9240], Liu, Junhao [0000-0002-4774-2998], Liu, Sheng-Yuan [0000-0003-4603-7119], Lu, Xing [0000-0003-2619-9305], Matsumura, Masafumi [0000-0002-6906-0103], Matthews, Brenda [0000-0003-3017-9577], Moriarty-Schieven, Gerald [0000-0002-0393-7822], Nagata, Tetsuya [0000-0001-9264-9015], Nakamura, Fumitaka [0000-0001-5431-2294], Ohashi, Nagayoshi [0000-0003-0998-5064], Parsons, Harriet [0000-0002-6327-3423], Pyo, Tae-soo [0000-0002-3273-0804], Qian, Lei [0000-0003-0597-0957], Qiu, Keping [0000-0002-5093-5088], Rao, Ramprasad [0000-0002-1407-7944], Rawlings, Jonathan [0000-0001-5560-1303], Rawlings, Mark G. [0000-0002-6529-202X], Richer, John [0000-0002-9693-6860], Rigby, Andrew [0000-0002-3351-2200], Savini, Giorgio [0000-0003-4449-9416], Shimajiri, Yoshito [0000-0001-9368-3143], Shinnaga, Hiroko [0000-0001-9407-6775], Tang, Ya-Wen [0000-0002-0675-276X], Tomisaka, Kohji [0000-0003-2726-0892], Tram, Le Ngoc [0000-0002-6488-8227], Viti, Serena [0000-0001-8504-8844], Wang, Jia-Wei [0000-0002-6668-974X], Wang, Hongchi [0000-0003-0746-7968], Yen, Hsi-Wei [0000-0003-1412-893X], Yun, Hyeong-Sik [0000-0001-6842-1555], Zhang, Chuan-Peng [0000-0002-4428-3183], and Apollo - University of Cambridge Repository
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Young stellar object ,FAR-INFRARED POLARIZATION ,Astrophysics ,F500 ,IMAGING POLARIMETRY ,MAGNETIC-FIELDS ,Gravitational energy ,STAR-FORMATION ,interstellar magnetic fields ,Bipolar outflow ,SCUBA-2 ,FORMING MOLECULAR CLOUDS ,GOULD BELT SURVEY ,James Clerk Maxwell Telescope ,polarimetry ,Physics ,interstellar medium ,SUBMILLIMETER POLARIZATION ,Magnetic energy ,Center (category theory) ,Interstellar Matter and the Local Universe ,CORES ,Astronomy and Astrophysics ,Polarization (waves) ,Astrophysics - Astrophysics of Galaxies ,Magnetic field ,Physics and Astronomy ,BIPOLAR OUTFLOW ,Space and Planetary Science ,star forming regions - Abstract
We present the results of simultaneous 450 $\mu$m and 850 $\mu$m polarization observations toward the massive star forming region NGC 2071IR, a target of the BISTRO (B-fields in Star-Forming Region Observations) Survey, using the POL-2 polarimeter and SCUBA-2 camera mounted on the James Clerk Maxwell Telescope. We find a pinched magnetic field morphology in the central dense core region, which could be due to a rotating toroidal disk-like structure and a bipolar outflow originating from the central young stellar object, IRS 3. Using the modified Davis-Chandrasekhar-Fermi method, we obtain a plane-of-sky magnetic field strength of 563$\pm$421 $\mu$G in the central $\sim$0.12 pc region from 850 $\mu$m polarization data. The corresponding magnetic energy density of 2.04$\times$10$^{-8}$ erg cm$^{-3}$ is comparable to the turbulent and gravitational energy densities in the region. We find that the magnetic field direction is very well aligned with the whole of the IRS 3 bipolar outflow structure. We find that the median value of polarization fractions, 3.0 \%, at 450 $\mu$m in the central 3 arcminute region, which is larger than the median value of 1.2 \% at 850 $\mu$m. The trend could be due to the better alignment of warmer dust in the strong radiation environment. We also find that polarization fractions decrease with intensity at both wavelengths, with slopes, determined by fitting a Rician noise model, of $0.59 \pm 0.03$ at 450 $\mu$m and $0.36 \pm 0.04$ at 850 $\mu$m, respectively. We think that the shallow slope at 850 $\mu$m is due to grain alignment at the center being assisted by strong radiation from the central young stellar objects., Comment: 17 pages, 11 figures, 4 tables
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- 2021
17. Laparoscopic excision of symptomatic prostatic utricle following proximal hypospadias repair
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Vo Ta Chung, Nguyen Bich Ngoc, Dang Thi Huyen Trang, Hong Quy Quan, Vu Hong Tuan, Nguyen Viet Hoa, and Pham Quang Hung
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Laparoscopic surgery ,medicine.medical_specialty ,Hypospadias ,medicine.diagnostic_test ,RD1-811 ,business.industry ,medicine.medical_treatment ,Laparoscopic excision ,medicine.disease ,Prostatic utricle ,Pediatrics ,RJ1-570 ,Endoscopy ,Surgery ,medicine.anatomical_structure ,Pediatrics, Perinatology and Child Health ,medicine ,Hypospadias repair ,Cyst ,business ,Laparoscopy - Abstract
Prostatic utricle results from incomplete regression of the Mullerian duct remnant and is closely associated with diseases such as proximal hypospadias. Surgical treatment is indicated for the symptomatic cyst. Laparoscopic excision is a modern and widely used approach. We report a 9-year-old boy with prostatic utricle who underwent proximal hypospadias repair four times in the preschool years. He was hospitalized for recurrent right epididymo-orchitis and his psychological anxiety. The patient was successfully and safely removed from the prostatic utricle by laparoscopy assistance of endoscopy. We suggest that periodic ultrasonography for pre- and post-operative severe hypospadias. Laparoscopic surgery should be the first approach because of its efficacy and safety.
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- 2021
18. FORECAST EFFECTS OF DROUGHT ON AGRICULTURAL LAND USE BY GIS AND REMOTE SENSING IN BAC TRA MY DISTRICT, QUANG NAM PROVINCE
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Huynh Van Chuong, Nguyen Thi Hong Mai, Tran Thi Phuong, Nguyen Bich Ngoc, and Nguyen Hoang Khanh Linh
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Remote sensing (archaeology) ,Agricultural land ,Environmental science ,Water resource management - Abstract
The phenomenon of prolonged drought as one of the consequences of climate change has significantly affected the agricultural production of rural communities in both mountainous and plain areas of Vietnam. This study, using standardized precipitation index (SPI) combining with the space technologies of Geographical Information Systems (GIS) and Remote Sensing (RS) to simulate and forecast the effects of drought on agricultural land use in Bac Tra My district, Quang Nam province. The data was set up for two scenarios of RCP 4.5 and RCP 8.5 in Bac Tra My district of Quang Nam province. Simultaneously, the research has also applied the focus group discussion, in-depth interview and field survey for data cross-checking to ensure highly reliable predictions. The research result has addressed four levels of drought, including normal, mild, moderate and severe drought appearing in the Summer-Autumn crop in the period 2016 – 2035 of the district. In which, severe drought will appear on large scale for both scenarios of RCP 4.5 and RCP 8.5 for 5 types of agricultural land use including paddy, annual crop, perennial, afforestation and aquacultural land. From these findings, the local authorities can consider and apply the adaptation and mitigation measures to climate change in agricultural land use planning.
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- 2021
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19. The JCMT BISTRO Survey: Revealing the Diverse Magnetic Field Morphologies in Taurus Dense Cores with Sensitive Submillimeter Polarimetry
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A-Ran Lyo, Nguyen Bich Ngoc, Jean-François Robitaille, L. M. Fissel, Jonathan Rawlings, Yapeng Zhang, Andrew Rigby, Matthew Joseph Griffin, Tetsuo Hasegawa, Ji-hyun Kang, Sam Falle, Jongsoo Kim, Jason Fiege, Il-Gyo Jeong, Ya-Wen Tang, Kate Pattle, Zhiwei Chen, Rachel Friesen, Florian Kirchschlager, Doris Arzoumanian, Chang Won Lee, Jennifer Hatchell, Ramprasad Rao, Shih-Ping Lai, Sung-ju Kang, Di Li, Kevin Lacaille, Keping Qiu, Eun Jung Chung, Dalei Li, Gerald H. Moriarty-Schieven, Archana Soam, Anthony Peter Whitworth, Shu-ichiro Inutsuka, Hua-bai Li, Per Friberg, Doug Johnstone, Lei Qian, Thiem Hoang, Kazunari Iwasaki, Lapo Fanciullo, Pham Ngoc Diep, Sarah Graves, Masato I. N. Kobayashi, Nicolas Peretto, Harriet Parsons, Jungyeon Cho, Hiroyuki Nakanishi, Chuan-Peng Zhang, Y. Shimajiri, Martin Houde, Fumitaka Nakamura, John Richer, Kee-Tae Kim, Serena Viti, Derek Ward-Thompson, Jianjun Zhou, Jason M. Kirk, Geumsook Park, Nagayoshi Ohashi, Erica Franzmann, C. Darren Dowell, Woojin Kwon, Mi-Ryang Kim, Sven Van Loo, Tyler Bourke, Mark G. Rawlings, Ilseung Han, Masumichi Seta, Junhao Liu, Motohide Tamura, Minho Choi, Jinghua Yuan, Hao-Yuan Duan, Hong-Li Liu, Wen Ping Chen, Jinjin Xie, Tie Liu, David Eden, S. P. S. Eyres, Yan Duan, Miju Kang, Charles L. H. Hull, Le Ngoc Tram, Koji S. Kawabata, Giorgio Savini, Sophia Dai, Masafumi Matsumura, Chakali Eswaraiah, Tae-Soo Pyo, Francisca Kemper, Yong-Hee Lee, Jia-Wei Wang, Saeko S. Hayashi, Yusuke Tsukamoto, Hsi-Wei Yen, Hyunju Yoo, Sang-Sung Lee, Antonio Chrysostomou, Gwanjeong Kim, Huei-Ru Vivien Chen, Brenda C. Matthews, S. Coude, Qilao Gu, Yasuo Doi, Guoyin Zhang, Tao-Chung Ching, Hiro Saito, Hongchi Wang, Ilse De Looze, Sheng-Yuan Liu, Philippe André, Jihye Hwang, Hiroko Shinnaga, David Berry, Hyeong-Sik Yun, Jane Greaves, Vera Konyves, Do-Young Byun, Ray S. Furuya, Mike Chen, Tim Gledhill, Kyoung Hee Kim, Tetsuya Zenko, Steve Mairs, Jungmi Kwon, Takayoshi Kusune, Chin-Fei Lee, Tetsuya Nagata, Tsuyoshi Inoue, Brendan Retter, Xing Lu, Patrick M. Koch, Yunhee Choi, Chi-Yan Law, Gary A. Fuller, Mehrnoosh Tahani, Takashi Onaka, Pierre Bastien, Xindi Tang, Anna M. M. Scaife, Kohji Tomisaka, Lei Zhu, Sarah Sadavoy, Akimasa Kataoka, Chakali, Eswaraiah [0000-0003-4761-6139], Furuya, Ray S. [0000-0003-0646-8782], Hasegawa, Tetsuo [0000-0003-1853-0184], Ward-Thompson, Derek [0000-0003-1140-2761], Qiu, Keping [0000-0002-5093-5088], Ohashi, Nagayoshi [0000-0003-0998-5064], Pattle, Kate [0000-0002-8557-3582], Sadavoy, Sarah [0000-0001-7474-6874], Hull, Charles L. H. [0000-0002-8975-7573], Berry, David [0000-0001-6524-2447], Doi, Yasuo [0000-0001-8746-6548], Ching, Tao-Chung [0000-0001-8516-2532], Lai, Shih-Ping [0000-0001-5522-486X], Wang, Jia-Wei [0000-0002-6668-974X], Koch, Patrick M. [0000-0003-2777-5861], Kwon, Jungmi [0000-0003-2815-7774], Kwon, Woojin [0000-0003-4022-4132], Bastien, Pierre [0000-0002-0794-3859], Arzoumanian, Doris [0000-0002-1959-7201], Coudé, Simon [0000-0002-0859-0805], Soam, Archana [0000-0002-6386-2906], Fanciullo, Lapo [0000-0001-9930-9240], Yen, Hsi-Wei [0000-0003-1412-893X], Liu, Junhao [0000-0002-4774-2998], Hoang, Thiem [0000-0003-2017-0982], Ping Chen, Wen [0000-0003-0262-272X], Shimajiri, Yoshito [0000-0001-9368-3143], Liu, Tie [0000-0002-5286-2564], Chen, Zhiwei [0000-0003-0849-0692], Li, Hua-bai [0000-0003-2641-9240], Lyo, A-Ran [0000-0002-9907-8427], Hwang, Jihye [0000-0001-7866-2686], Johnstone, Doug [0000-0002-6773-459X], Rao, Ramprasad [0000-0002-1407-7944], Bich Ngoc, Nguyen [0000-0002-5913-5554], Ngoc Diep, Pham [0000-0002-2808-0888], Mairs, Steve [0000-0002-6956-0730], Parsons, Harriet [0000-0002-6327-3423], Tamura, Motohide [0000-0002-6510-0681], Tahani, Mehrnoosh [0000-0001-8749-1436], Vivien Chen, Huei-Ru [0000-0002-9774-1846], Nakamura, Fumitaka [0000-0001-5431-2294], Shinnaga, Hiroko [0000-0001-9407-6775], Tang, Ya-Wen [0000-0002-0675-276X], Cho, Jungyeon [0000-0003-1725-4376], Won Lee, Chang [0000-0002-3179-6334], Inutsuka, Shu-ichiro [0000-0003-4366-6518], Iwasaki, Kazunari [0000-0002-2707-7548], Qian, Lei [0000-0003-0597-0957], Xie, Jinjin [0000-0002-2738-146X], Liu, Hong-Li [0000-0003-3343-9645], Zhang, Chuan-Peng [0000-0002-4428-3183], Zhou, Jianjun [0000-0003-0356-818X], André, Philippe [0000-0002-3413-2293], Liu, Sheng-Yuan [0000-0003-4603-7119], Lu, Xing [0000-0003-2619-9305], Bourke, Tyler L. [0000-0001-7491-0048], Byun, Do-Young [0000-0003-1157-4109], Eden, David [0000-0002-5881-3229], Matthews, Brenda [0000-0003-3017-9577], Fissel, Laura M. [0000-0002-4666-609X], Kim, Kee-Tae [0000-0003-2412-7092], Lee, Chin-Fei [0000-0002-3024-5864], Kim, Jongsoo [0000-0002-1229-0426], Pyo, Tae-Soo [0000-0002-3273-0804], Chrysostomou, Antonio [0000-0002-9583-8644], Jung Chung, Eun [0000-0003-0014-1527], Ngoc Tram, Le [0000-0002-6488-8227], Franzmann, Erica [0000-0003-2142-0357], Friberg, Per [0000-0002-8010-8454], Friesen, Rachel [0000-0001-7594-8128], Fuller, Gary [0000-0001-8509-1818], Gledhill, Tim [0000-0002-2859-4600], Graves, Sarah [0000-0001-9361-5781], Griffin, Matt [0000-0002-0033-177X], Gu, Qilao [0000-0002-2826-1902], Hatchell, Jennifer [0000-0002-4870-2760], Houde, Martin [0000-0003-4420-8674], Kawabata, Koji [0000-0001-6099-9539], Jeong, Il-Gyo [0000-0002-5492-6832], Kang, Ji-hyun [0000-0001-7379-6263], Kang, Sung-ju [0000-0002-5004-7216], Kang, Miju [0000-0002-5016-050X], Kataoka, Akimasa [0000-0003-4562-4119], Kemper, Francisca [0000-0003-2743-8240], Rawlings, Mark [0000-0002-6529-202X], Rawlings, Jonathan [0000-0001-5560-1303], Richer, John [0000-0002-9693-6860], Rigby, Andrew [0000-0002-3351-2200], Savini, Giorgio [0000-0003-4449-9416], Scaife, Anna [0000-0002-5364-2301], Kim, Gwanjeong [0000-0003-2011-8172], Hee Kim, Kyoung [0000-0001-9597-7196], Kim, Mi-Ryang [0000-0002-1408-7747], Kirchschlager, Florian [0000-0002-3036-0184], Kirk, Jason [0000-0002-4552-7477], Kobayashi, Masato I. N. [0000-0003-3990-1204], Konyves, Vera [0000-0002-3746-1498], Kusune, Takayoshi [0000-0002-9218-9319], Lacaille, Kevin [0000-0001-9870-5663], Law, Chi-Yan [0000-0003-1964-970X], Lee, Sang-Sung [0000-0002-6269-594X], Lee, Yong-Hee [0000-0001-6047-701X], Matsumura, Masafumi [0000-0002-6906-0103], Moriarty-Schieven, Gerald [0000-0002-0393-7822], Nagata, Tetsuya [0000-0001-9264-9015], Onaka, Takashi [0000-0002-8234-6747], Park, Geumsook [0000-0001-8467-3736], Tang, Xindi [0000-0002-4154-4309], Tomisaka, Kohji [0000-0003-2726-0892], Viti, Serena [0000-0001-8504-8844], Wang, Hongchi [0000-0003-0746-7968], Yoo, Hyunju [0000-0002-8578-1728], Zhang, Yapeng [0000-0002-5102-2096], Falle, Sam [0000-0002-9829-0426], Robitaille, Jean-François [0000-0001-5079-8573], Apollo - University of Cambridge Repository, Eswaraiah, Chakali [0000-0003-4761-6139], Laboratoire d'Astrophysique de Marseille (LAM), and Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)
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low mass stars ,010504 meteorology & atmospheric sciences ,Continuum (design consultancy) ,AXISYMMETRICAL CLOUD CORES ,Astrophysics ,F500 ,MOLECULAR CLOUD ,IMAGING POLARIMETRY ,01 natural sciences ,AMBIPOLAR-DIFFUSION ,STAR-FORMATION ,interstellar magnetic fields ,Protein filament ,CONTRACTION ,0103 physical sciences ,SCUBA-2 ,COLLAPSE ,010303 astronomy & astrophysics ,James Clerk Maxwell Telescope ,0105 earth and related environmental sciences ,dust continuum emission ,polarimetry ,Physics ,Ambipolar diffusion ,Star formation ,F510 ,dense interstellar clouds ,Astronomy and Astrophysics ,GOULD BELT ,Magnetic flux ,Magnetic field ,DARK CLOUDS ,Core (optical fiber) ,Physics and Astronomy ,[SDU]Sciences of the Universe [physics] ,Space and Planetary Science - Abstract
We have obtained sensitive dust continuum polarization observations at 850 μm in the B213 region of Taurus using POL-2 on SCUBA-2 at the James Clerk Maxwell Telescope as part of the B-fields in STar-forming Region Observations (BISTRO) survey. These observations allow us to probe magnetic field (B-field) at high spatial resolution (∼2000 au or ∼0.01 pc at 140 pc) in two protostellar cores (K04166 and K04169) and one prestellar core (Miz-8b) that lie within the B213 filament. Using the Davis–Chandrasekhar–Fermi method, we estimate the B-field strengths in K04166, K04169, and Miz-8b to be 38 ± 14, 44 ± 16, and 12 ± 5 μG, respectively. These cores show distinct mean B-field orientations. The B-field in K04166 is well ordered and aligned parallel to the orientations of the core minor axis, outflows, core rotation axis, and large-scale uniform B-field, in accordance with magnetically regulated star formation via ambipolar diffusion taking place in K04166. The B-field in K04169 is found to be ordered but oriented nearly perpendicular to the core minor axis and large-scale B-field and not well correlated with other axes. In contrast, Miz-8b exhibits a disordered B-field that shows no preferred alignment with the core minor axis or large-scale field. We found that only one core, K04166, retains a memory of the large-scale uniform B-field. The other two cores, K04169 and Miz-8b, are decoupled from the large-scale field. Such a complex B-field configuration could be caused by gas inflow onto the filament, even in the presence of a substantial magnetic flux.
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- 2021
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20. Internationalization of Vietnamese garment manufacturers from an innovation perspective: toward a U-shaped internationalization path
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Nguyen Bich Ngoc, Olav Jull Sørensen, Rana, Mohammad B., and Allen, Matthew M.C.
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Product (business) ,Internationalization ,U-shaped Internationalization Process ,Innovation ,Upgrading ,Global Value Chain ,Domestic Market in Emerging Economies ,Vietnam Garment Industry ,business.industry ,Multinational corporation ,Perfect competition ,business ,Emerging markets ,Domestic market ,Industrial organization ,Outsourcing ,Global value chain - Abstract
Innovation is a prerequisite for growing firms in a competitive market that is increasingly structured within global value chains. These global highways are organized and managed by multinational companies (MNCs), which are continuously seeking international locations possessing a business community that could add value by increasing the efficiency and effectiveness of product and service provision on a broad scale. Such locations are often found within emerging economies.This single case study from the garment industry in Vietnam explores how the case company internationalizes and the role played by innovation in shaping the internationalization path. The frame for the study is the global value chain and its associated upgrading models. A U-shaped internationalization model is found for the case company.. Efficiency and reactive innovations play a crucial role for the first degree of internationalization on the global outsourcing market, and the domestic market and proactive innovations related to design and brand play a crucial role as a pre-requisite for a second degree of internationalization. The study also contributes to the literature by aligning the internationalization path with an innovation path (reactive, interactive, and proactive innovation). Finally, the study concludes that the upgrading theory drawn from the global value chain frame should and could be aligned with the broader frame of innovation theory.
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- 2021
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21. Morpho-kinematics of the circumstellar envelope of the AGB star R Dor: a global view
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N. T. Phuong, Do Thi Hoai, Nguyen Bich Ngoc, T T Thai, P. Tuan-Anh, Pierre Darriulat, Pham Tuyet Nhung, and Pham Ngoc Diep
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Physics ,Line-of-sight ,010504 meteorology & atmospheric sciences ,FOS: Physical sciences ,Astronomy and Astrophysics ,Circumstellar envelope ,Astrophysics ,Star (graph theory) ,01 natural sciences ,Astrophysics - Astrophysics of Galaxies ,Flattening ,Cover (topology) ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,0103 physical sciences ,Asymptotic giant branch ,Continuum (set theory) ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,0105 earth and related environmental sciences ,Line (formation) - Abstract
We analyse new ALMA observations of the $^{29}$SiO ($\nu$=0, $J$=8$-$7) and SO$_2$($\nu$=0, $34_{3,31}$$-$$34_{2,32}$) line emissions of the circumstellar envelope (CSE) of the oxygen-rich AGB star R Dor. With a spatial resolution of $\sim$2.3 au, they cover distances below $\sim$30 au from the star providing a link between earlier observations and clarifying some open issues. The main conclusions are: 1) Rotation is confined below $\sim$15 au from the star, with velocity reaching a maximum below 10 au and morphology showing no significant disc-like flattening. 2) In the south-eastern quadrant, a large Doppler velocity gas stream is studied in more detail than previously possible and its possible association with an evaporating planetary companion is questioned. 3) A crude evaluation of the respective contributions of rotation, expansion and turbulence to the morpho-kinematics is presented. Significant line broadening occurs below $\sim$12 au from the star and causes the presence of high Doppler velocity components near the line of sight pointing to the centre of the star. 4) Strong absorption of the continuum emission of the stellar disc and its immediate dusty environment is observed to extend beyond the disc in the form of self-absorption. The presence of a cold SiO layer extending up to some 60 au from the star is shown to be the cause. 5) Line emissions from SO, $^{28}$SiO, CO and HCN molecules are used to probe the CSE up to some 100 au from the star and reveal the presence of two broad back-to-back outflows, the morphology of which is studied in finer detail than in earlier work., Comment: 20 pages, 26 figures, accepted for publication in MNRAS
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- 2021
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22. Observations of magnetic fields surrounding LkH$\alpha$ 101 taken by the BISTRO survey with JCMT-POL-2
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Fumitaka Nakamura, Lapo Fanciullo, Eun Jung Chung, Yan Duan, Sophia Dai, Saeko S. Hayashi, Sven Van Loo, Dalei Li, Nicolas Peretto, Ray S. Furuya, Miju Kang, Tyler Bourke, Mark G. Rawlings, John Richer, Archana Soam, Kee-Tae Kim, Anna M. M. Scaife, Kohji Tomisaka, Jason M. Kirk, Hiroko Shinnaga, Anthony Peter Whitworth, David Berry, Chakali Eswaraiah, Le Ngoc Tram, Masumichi Seta, Serena Viti, Geumsook Park, Sheng-Yuan Liu, Nagayoshi Ohashi, Antonio Chrysostomou, Yunhee Choi, Tsuyoshi Inoue, Tae-Soo Pyo, Hongchi Wang, Pham Ngoc Diep, Erica Franzmann, Matthew Joseph Griffin, Francisca Kemper, Kyoung Hee Kim, Tetsuo Hasegawa, Hiro Saito, C. Darren Dowell, Philippe André, Chuan-Peng Zhang, Yong-Hee Lee, Sung-ju Kang, Sam Falle, Mike Chen, Gary A. Fuller, Jongsoo Kim, Chi-Yan Law, Mi-Ryang Kim, Tetsuya Zenko, Thiem Hoang, Tim Gledhill, A-Ran Lyo, Gerald Moriarty-Schieven, Nguyen Bich Ngoc, Takashi Onaka, Pierre Bastien, Motohide Tamura, Harriet Parsons, Hua-bai Li, Takayoshi Kusune, Jungmi Kwon, Xindi Tang, Zhiwei Chen, Tetsuya Nagata, Chin-Fei Lee, Brendan Retter, Guoyin Zhang, Martin Houde, Ji-hyun Kang, Jason Fiege, Il-Gyo Jeong, James Di Francesco, Jane Greaves, Vera Konyves, Do-Young Byun, Junhao Liu, Chang Won Lee, Jia-Wei Wang, Qilao Gu, Patrick M. Koch, Kate Pattle, Shu-ichiro Inutsuka, Derek Ward-Thompson, Florian Kirchschlager, Doris Arzoumanian, Hyeong-Sik Yun, Jianjun Zhou, Lei Zhu, Yusuke Tsukamoto, Charles L. H. Hull, Koji S. Kawabata, Minho Choi, Hyeseung Lee, Yasuo Doi, Kevin Lacaille, Brenda C. Matthews, Ilseung Han, Per Friberg, S. Coude, Jennifer Hatchell, Ramprasad Rao, Di Li, Jihye Hwang, Jean-François Robitaille, L. M. Fissel, Jonathan Rawlings, Gwanjeong Kim, Huei-Ru Vivien Chen, Sarah Sadavoy, Giorgio Savini, Yapeng Zhang, Shih-Ping Lai, Akimasa Kataoka, Xing Lu, Doug Johnstone, Steve Mairs, Andrew Rigby, Mehrnoosh Tahani, Masato I. N. Kobayashi, Hsi-Wei Yen, Hyunju Yoo, Tie Liu, Woojin Kwon, S. L. Kim, Hao-Yuan Duan, Hong-Li Liu, Sang-Sung Lee, Jinjin Xie, Masafumi Matsumura, Tao-Chung Ching, David Eden, Ilse De Looze, Jeong-Eun Lee, S. P. S. Eyres, Rachel Friesen, Jinghua Yuan, Keping Qiu, Sarah Graves, Jungyeon Cho, Wen Ping Chen, Hiroyuki Nakanishi, Y. Shimajiri, Lei Qian, Kazunari Iwasaki, and Ya-Wen Tang
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Physics ,010308 nuclear & particles physics ,Star formation ,Molecular cloud ,Astronomy and Astrophysics ,molecular clouds ,Astrophysics ,F500 ,Polarization (waves) ,01 natural sciences ,Astrophysics - Astrophysics of Galaxies ,star formation ,Redshift ,interstellar magnetic fields ,Magnetic field ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,0103 physical sciences ,Gravitational collapse ,Radiative transfer ,010303 astronomy & astrophysics ,James Clerk Maxwell Telescope ,Astrophysics::Galaxy Astrophysics - Abstract
We report the first high spatial resolution measurement of magnetic fields surrounding LkH$\alpha$ 101, a part of the Auriga-California molecular cloud. The observations were taken with the POL-2 polarimeter on the James Clerk Maxwell Telescope within the framework of the B-fields In Star-forming Region Observations (BISTRO) survey. Observed polarization of thermal dust emission at 850 $\mu$m is found to be mostly associated with the red-shifted gas component of the cloud. The magnetic field displays a relatively complex morphology. Two variants of the Davis-Chandrasekhar-Fermi method, unsharp masking and structure function, are used to calculate the strength of magnetic fields in the plane of the sky, yielding a similar result of $B_{\rm POS}\sim 115$ $\mathrm{\mu}$G. The mass-to-magnetic-flux ratio in critical value units, $\lambda\sim0.3$, is the smallest among the values obtained for other regions surveyed by POL-2. This implies that the LkH$\alpha$ 101 region is sub-critical and the magnetic field is strong enough to prevent gravitational collapse. The inferred $\delta B/B_0\sim 0.3$ implies that the large scale component of the magnetic field dominates the turbulent one. The variation of the polarization fraction with total emission intensity can be fitted by a power-law with an index of $\alpha=0.82\pm0.03$, which lies in the range previously reported for molecular clouds. We find that the polarization fraction decreases rapidly with proximity to the only early B star (LkH$\alpha$ 101) in the region. The magnetic field tangling and the joint effect of grain alignment and rotational disruption by radiative torques are potential of explaining such a decreasing trend., Comment: 25 pages, 19 figures, Accepted for publication in The Astrophysical Journal
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- 2020
23. MASS APPRAISAL APPLICATION FOR LAND VALUATION USING REGRESSION MODEL: A CASE STUDY IN THE C ZONE OF NAM HOI AN PROJECT, THANG BINH DISTRICT, QUANG NAM PROVINCE, CENTRAL VIETNAM
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Tran Thi Phuong, Nguyen Van Viet, Ho Viet Hoang, Nguyen Bich Ngoc, and Huynh Van Chuong
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Valuation (logic) ,Geography ,Mass appraisal ,Forestry ,Regression analysis - Abstract
This study focuses on building a regression model in the series of land pricing for frontages and alleys in the C zone of Nam Hoi An project, Thang Binh district, Quang Nam province. The research applied data collection method, data processing method, regression analysis method to build a model of mass land valuation. The results of this study show that the location of the facade in the C zone of Nam Hoi An project is affected by various factors such as security, plot width, plot shape, distance to Hoi An city, traffic congestion, land use type, and road boundary. Meanwhile, the unit price of land in the alley is influenced by factors such as security, alley level, plot shape, distance to Hoi An city, road structure, traffic congestion and alley location. The biggest factor affecting frontage land price is the type of land use with regression coefficient BLAND_USE_TYPE = 14,199. In terms of unit price of alley land, that is the type of alley with regression coefficient BALLEY_LOCATION = 10,772. The results of verification of the accuracy of the land unit price from the regression model to the compensation land unit price have a negligible difference, which is completely consistent with the requirement of determining the price level close to the market price. The results of this study show the practical applicability of mass appraisal for land valuation using a regression model in land acquisition and financial management of land.
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- 2020
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24. Grain alignment and disruption by radiative torques in dense molecular clouds and implication for polarization holes
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Pham Ngoc Diep, Le Ngoc Tram, Hyeseung Lee, Thiem Hoang, and Nguyen Bich Ngoc
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Physics ,Earth and Planetary Astrophysics (astro-ph.EP) ,010504 meteorology & atmospheric sciences ,Degree (graph theory) ,Molecular cloud ,FOS: Physical sciences ,Astronomy and Astrophysics ,Polarization (waves) ,01 natural sciences ,Molecular physics ,Astrophysics - Astrophysics of Galaxies ,Interstellar medium ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,0103 physical sciences ,Optical depth (astrophysics) ,Radiative transfer ,Protostar ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,0105 earth and related environmental sciences ,Cosmic dust ,Astrophysics - Earth and Planetary Astrophysics - Abstract
Dust polarization induced by aligned grains is widely used to study magnetic fields in various environments, including star-forming regions. However, the question of to what optical depth grain alignment still exists in a dense molecular cloud (MC) is unclear. In this paper, we aim to achieve analytical formulae for the minimum size of aligned grains ($a_{\rm align}$) and rotational disruption ($a_{\rm disr}$) by RAdiative Torques (RATs) as a function of the local physical parameters within dense MCs. We first find the analytical approximations for the radiation strength and the mean wavelength of the attenuated radiation field in a dense MC without and with embedded stars and then derive analytical formulae for $a_{\rm align}$ and $a_{\rm disr}$ as functions of the visual extinction $A_{V}$ and the gas density. We find that within a starless core of density $n_{\rm H}\sim 10^{5}\rm cm^{-3}$, grains of size $a, 18 pages, 12 figures, submitted to ApJ
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- 2020
25. Studying Magnetic Fields and Dust in M17 Using Polarized Thermal Dust Emission Observed by SOFIA/HAWC+
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Thuong Duc Hoang, Nguyen Bich Ngoc, Pham Ngoc Diep, Le Ngoc Tram, Thiem Hoang, Kate Pattle, Wanggi Lim, Ngan Le, Dieu D. Nguyen, Nguyen Thi Phuong, Nguyen Fuda, Tuan Van Bui, Gia Bao Truong Le, Hien Phan, and Nguyen Chau Giang
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Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics - Astrophysics of Galaxies ,Astrophysics::Galaxy Astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) - Abstract
We report the highest spatial resolution measurement of magnetic fields in M17 using thermal dust polarization taken by SOFIA/HAWC+ centered at 154 $\mu$m wavelength. Using the Davis-Chandrasekhar-Fermi method, we found the presence of strong magnetic fields of $980 \pm 230\;\mu$G and $1665 \pm 885\;\mu$G in lower-density (M17-N) and higher-density (M17-S) regions, respectively. The magnetic field morphology in M17-N possibly mimics the fields in gravitational collapse molecular cores while in M17-S the fields run perpendicular to the matter structure and display a pillar and an asymmetric hourglass shape. The mean values of the magnetic field strength are used to determine the Alfv\'enic Mach numbers ($\mathcal{M_A}$) of M17-N and M17-S which turn out to be sub-Alfv\'enic, or magnetic fields dominate turbulence. We calculate the mass-to-flux ratio, $\lambda$, and obtain $\lambda=0.07$ for M17-N and $0.28$ for M17-S. The sub-critical values of $\lambda$ are in agreement with the lack of massive stars formed in M17. To study dust physics, we analyze the relationship between the dust polarization fraction, $p$, and the thermal emission intensity, $I$, gas column density, $N({\rm H_2})$, and dust temperature, $T_{\rm d}$. The polarization fraction decreases with intensity as $I^{-\alpha}$ with $\alpha = 0.51$. The polarization fraction also decreases with increasing $N(\rm H_{2})$, which can be explained by the decrease of grain alignment by radiative torques (RATs) toward denser regions with a weaker radiation field and/or tangling of magnetic fields. The polarization fraction tends to increase with $T_{\rm d}$ first and then decreases when $T_ {\rm d} > 50$ K. The latter feature seen in the M17-N, where the gas density changes slowly with $T_{d}$, is consistent with the RAT disruption effect., Comment: Submitted to Apj
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- 2022
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26. Factors influencing residential water consumption in Wallonia, Belgium
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Mario Cools, Jacques Teller, Cédric Prevedello, and Nguyen Bich-Ngoc
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Urban form ,Sociology and Political Science ,Water source ,Urban density ,Environmental science ,Spatial variability ,Management, Monitoring, Policy and Law ,Development ,Business and International Management ,Water resource management ,Water consumption ,Water use ,Rainwater harvesting - Abstract
Studies on residential water determinants often considered a limited number of possible factors due to lacking data, especially at micro-levels. This study aims to address the simultaneous effects of (1) household characteristics, (2) alternative sources of water, (3) dwelling properties, (4) water appliances, (5) attitudes, and (6) urban form on household water use in Wallonia (Belgium). Results emphasize the importance of household characteristics, use of alternative water sources, and dwelling properties. When compared to these variables, the influence of urban density appears very limited. Accordingly, the often-observed location factors are mainly related to the shared household characteristics, such as composition, income, lot area, or the practice of using rainwater.
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- 2022
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27. The characteristics of non-tariff measures in Vietnam foreign trade
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Nguyen Bich Ngoc
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Commercial policy ,Market structure ,World economy ,business.industry ,Openness to experience ,Developing country ,Tariff ,Business ,International trade ,Diversification (marketing strategy) ,Developed country - Abstract
Non-tariff measures (NTMs) are the key instruments in the trade policy in recent years. The high rate of integration in the world market are required the high prevalence of NTMs imposed on products. In fact, developing countries have less concern about the vital role of NTMs than developed nations. Vietnam are the exporting-led economy with the highest rate of trade openness and the diversification of products and market structure. The aim of the paper identifies the characteristics of Vietnam’s non-tariff measures imposing on imports. The role of non-tariff measures in Vietnam parallel with the increasingly prevalence of these measures in the world economy.
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- 2018
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28. The transition process of Vietnam’s trade policy from closed economy to 'servicification' economy
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Nguyen Bich Ngoc
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Commercial policy ,Economy ,Process (engineering) ,Transition (fiction) ,Vietnamese ,Transition economy ,Economics ,language ,Economic reform ,Closed economy ,language.human_language - Abstract
As one typical transition economy, Vietnam has sharply progressed from a centrally-planned system to a market economy due to the economic reform. Together with the socio-economic development strategy, trade policy has been fully consistent with the transformation. While the effects of trade policy have received much concern in the academia, the paper finds out deeply the change on strategies of trade policy in transition economies in the attempt to catching up the advanced countries. The finding is to draw on the whole picture of Vietnamese trade policy over the period (from 1986 to 2016) and to analyse the remarkable changes leading to successes and failures on these policies.
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- 2018
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29. An energy consumption model for the Algerian residential building's stock, based on a triangular approach: Geographic Information System (GIS), regression analysis and hierarchical cluster analysis
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Marwa Afaifia, Jacques Teller, Nguyen Bich-Ngoc, and Kahina Amal Djiar
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Geographic information system ,Renewable Energy, Sustainability and the Environment ,business.industry ,Computer science ,Geography, Planning and Development ,Urban density ,Transportation ,Regression analysis ,Energy consumption ,Energy transition ,Environmental economics ,Energy policy ,Hierarchical clustering ,Cluster analysis ,business ,Civil and Structural Engineering - Abstract
Modelling residential energy consumption (REC) represents a key step towards the implementation of energy transition policies for more sustainable cities. Developing such policies requires considering the characteristics of the residential building stock (RBS). In the literature, REC modelling is generally applied on a single or set of cities-provinces, through limited approaches, using data from one typical year. In this paper, an energy consumption model for the entire Algerian RBS is developed through a triangular approach combining Geographic Information System, regression analysis and hierarchical clustering, applied to all provinces from 1995 to 2018. This allows mapping the spatial-temporal distribution of REC and RBS, developing a REC model, and dividing all provinces into clusters based on their REC behaviour. Provinces are aggregated into four clusters and four provinces are identified as archetypes. The results highlight that, besides the size of the RBS, REC is highly dependent on the electricity and gas connection rates. However, the influence of GDP and urban density only play a minor role. This can be explained by the evolving demands in thermal comfort associated with access to energy networks. The likely impact of increased gas and electricity connection represents a crucial factor in the design of energy policies.
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- 2021
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30. Equivariant extension of distributions on GLn
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Nguyen, Bich-Ngoc Cao
- Abstract
Let k be a non-Archimedean local field, and Cc∞(GLn) the space of locally constant compactly supported complex-valued functions on the general linear group GLn over k. For every irreducible representation (𝜋,V) of GLn, the space Hom(Cc∞(GLn), V ⊗ Ṽ) is one-dimensional. This space is generated by an element denoted by 𝜁, which can be thought of as an integral against matrix coefficients. In this thesis, we are interested in the so-called "extension problem" of 𝜁. More explicitly, for 0≤m≤n, GLn can be embedded into the space R≥m of all n×n matrices over k of rank at least m. If 𝜁 lies in the image of the induced map of this embedding, then we say that 𝜁 can be extended to rank at least m. For m=0, the extension problem of 𝜁 to rank at least 0 has been completely answered in Tate's thesis for n=1, and by Moeglin, Vignéras, Waldspurger, and Minguez for general n. Our goal is to determine the least value m for a given representation such that 𝜁 can be extended to rank at least m. A representation is said to appear in rank m if Hom(Cc∞(R≥m), V ⊗ Ṽ) is non-trivial. It is natural to conjecture that 𝜁 extends to rank at least m+1 but does not extend to rank at least m where m is the highest rank less than n that 𝜋 appears in. In this thesis, this conjecture is proved for spherical representations, by means of extending Satake transform to the space of K-bi-invariant functions on Mn and obtaining a partial description of the image of the rank filtration under this extended Satake transform. Some explicit computations for spherical representations of GL₃ are included as motivating examples of the general case.There are also some suggestive calculations for non-spherical representations of GL₂.
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- 2020
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31. Diabetes: What Challenges Lie Ahead for Vietnam?
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Zhou Lu Lin, Nguyen Bich Ngoc, and Waqas Ahmed
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Rural Population ,Health Knowledge, Attitudes, Practice ,Vietnamese ,Population ,Ethnic group ,Review ,Infectious and parasitic diseases ,RC109-216 ,Health Services Accessibility ,03 medical and health sciences ,0302 clinical medicine ,Quality of life ,Risk Factors ,Environmental health ,Health care ,Diabetes Mellitus ,Ethnicity ,Prevalence ,Humans ,Medicine ,Obesity ,030212 general & internal medicine ,education ,Health policy ,Dyslipidemias ,education.field_of_study ,business.industry ,Health Policy ,030503 health policy & services ,Smoking ,Social environment ,Health Care Costs ,General Medicine ,language.human_language ,Diet ,Vietnam ,Hypertension ,Quality of Life ,language ,Health Expenditures ,Sedentary Behavior ,Public aspects of medicine ,RA1-1270 ,Rural area ,0305 other medical science ,business ,Risk Reduction Behavior - Abstract
Background: Economic development and social environment changes influence disease patterns ranging from infectious diseases to noncommunicable diseases, and diabetes is one of the seven causes leading to death and disability in Vietnam. Objectives: The purpose of this research is to present an overview of the challenges related to diabetes prevention in Vietnam and to find effective ways for the prevention and control of diabetes, as well as to improve the quality of life among diabetes patients. Methods: The literature review was conducted using a variety of databases, such as PubMed, Google Scholar, Science Direct, Vietnamese data sources, and papers published in the Vietnamese language. For the searches, we used keywords such as “Diabetes,” “Prevention,” and “Prevalence of Diabetes.” Findings and Conclusions: With the increasing prevalence of diabetes, there are approximately 5.76 million people with diabetes currently living in Vietnam. The age-adjusted comparative prevalence of diabetes in the population of Vietnam was approximately 6% in 2017. This review suggests that the government needs to establish social security and policy programs aimed at reducing social risk factors and the burden of healthcare costs for diabetes treatment in older people. In addition, attention should be paid to the management and control of diabetes-related diseases, with an emphasis on new techniques for early diagnosis and treatment. Simultaneously, the health system should ensure that diabetes patients living in rural areas and belonging to ethnic minorities can access better healthcare services to improve their health and decrease their risk for chronic disease and death.
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- 2020
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32. Spectral properties of the surface reflectance of the northern polar region of Mercury
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Nicolas Bott, Nguyen Bich Ngoc, and Pham Ngoc Diep
- Subjects
Physics ,Earth and Planetary Astrophysics (astro-ph.EP) ,Spectrometer ,010308 nuclear & particles physics ,Mineralogy ,chemistry.chemical_element ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,01 natural sciences ,Regolith ,Spectral line ,Mercury (element) ,Wavelength ,Astrophysics - Solar and Stellar Astrophysics ,chemistry ,Space and Planetary Science ,0103 physical sciences ,Spectral slope ,Polar ,Ejecta ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astrophysics - Earth and Planetary Astrophysics - Abstract
We analyse MESSENGER reflectance measurements covering the northern polar region of Mercury, the least studied region of the northern mercurian hemisphere. We use observations from the Mercury Dual Imaging System Wide-Angle Camera (MDIS/WAC) and the Mercury Atmospheric and Surface Composition Spectrometer (MASCS/VIRS) to study the spectral dependence of the surface reflectance. The results obtained from the observations made by both instruments are remarkably consistent. We find that a second degree polynomial description of the measured reflectance spectra gives very good fits to the data and that the information that they carry can best be characterized by two parameters, the mean reflectance and the mean relative spectral slope, averaged over the explored range of wavelengths. The properties of the four main types of terrains known to form Mercury's regolith in the northern region, smooth plains (SP), heavily cratered terrain (HCT), fresh ejecta/materials and red pitted ground (RPG) are examined in terms of these two parameters. The results are compared, and found consistent with those obtained by earlier studies in spite of difficulties met in obtaining accurate reflectance measurements under the large incidence angle condition characteristic of polar regions. These results will help with the preparation of the BepiColombo mission and with supporting its observational strategy., Comment: 21 pages, 15 figures, accepted for publication in Research in Astronomy and Astrophysics
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- 2019
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33. Temperature preference of Nile tilapia (Oreochromis niloticus) juveniles induces spontaneous sex reversal
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Renaud Nivelle, Vincent Gennotte, Emery Jules Kembolo Kalala, Nguyen Bich Ngoc, Marc Muller, Charles Mélard, and Carole Rougeot
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Male ,Multidisciplinary ,Hot Temperature ,Sex Differentiation ,lcsh:R ,Temperature ,Correction ,lcsh:Medicine ,Cichlids ,Sex Determination Processes ,Models, Biological ,Species Specificity ,Animals ,Female ,lcsh:Q ,Sex Ratio ,lcsh:Science - Abstract
Nile tilapia (Oreochromis niloticus) is an African freshwater fish that displays a genetic sex determination system (XX|XY) where high temperatures (above 32°C to 36.5°C) induce masculinization. In Nile tilapia, the thermosensitive period was reported from 10 to 30 days post fertilization. In their natural environment, juveniles may encounter high temperatures that are above the optimal temperature for growth (27-30°C). The relevance of the thermal sex reversal mechanism in a natural context remains unclear. The main objective of our study is to determine whether sexually undifferentiated juveniles spontaneously prefer higher, unfavorable temperatures and whether this choice skews the sex ratio toward males. Five full-sib progenies (from 100% XX crosses) were subjected to (1) a horizontal three-compartment thermal step gradient (thermal continuum 28°C- 32°C- 36.5°C) during the thermosensitive period, (2) a control continuum (28°C- 28°C- 28°C) and (3) a thermal control tank (36.5°C). During the first days of the treatment, up to an average of 20% of the population preferred the masculinizing compartment of the thermal continuum (36.5°C) compared to the control continuum. During the second part of the treatment, juveniles preferred the lower, nonmasculinizing 32°C temperature. This short exposure to higher temperatures was sufficient to significantly skew the sex ratio toward males, compared to congeners raised at 28°C (from 5.0 ± 6.7% to 15.6 ± 16.5% of males). The proportion of males was significantly different in the thermal continuum, thermal control tank and control continuum, and it was positively correlated among populations. Our study shows for the first time that Nile tilapia juveniles can choose a masculinizing temperature during a short period of time. This preference is sufficient to induce sex reversal to males within a population. For the first time, behavior is reported as a potential player in the sex determination mechanism of this species.
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- 2019
34. The Effect of Corporate Social Responsibility Disclosure on Financial Performance: Evidence from Credit Institutions in Vietnam
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Nguyen Bich Ngoc
- Subjects
050208 finance ,Financial performance ,business.industry ,General Arts and Humanities ,media_common.quotation_subject ,05 social sciences ,General Social Sciences ,Accounting ,Linkage (mechanical) ,law.invention ,Content analysis ,law ,Negative relationship ,Perception ,0502 economics and business ,Ordinary least squares ,Corporate social responsibility ,Business ,General Economics, Econometrics and Finance ,Social responsibility ,050203 business & management ,media_common - Abstract
This study examines the relationship between corporate social responsibility (CSR) disclosure and financial performance of banks in Vietnam over the period 2011 – 2016. By using content analysis to approach CSR related data as well as ordinary least square (OLS) estimator to analyse data, the finding of this study indicates that there is a significant negative relationship between CSR disclosure and financial performance of commercial banks in Vietnam. This result might be explained by additional requirements of the law for social responsibility while banks are in difficult situation as a result of economic slowdown during researched period. Together with that, perception of banks’ customers toward banking corporate social responsibility of Vietnam also contributed to build up this negative linkage.
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- 2018
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35. A Review of Residential Water Consumption Determinants
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Jacques Teller and Nguyen Bich-Ngoc
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Resource (biology) ,Scope (project management) ,business.industry ,Smart meter ,0208 environmental biotechnology ,Water supply ,02 engineering and technology ,010501 environmental sciences ,Environmental economics ,01 natural sciences ,020801 environmental engineering ,Spillover effect ,Cultural diversity ,Consumer privacy ,business ,Proxy (statistics) ,0105 earth and related environmental sciences - Abstract
Water supply sectors are facing higher uncertainty in both resource availability and consumer demand. Future conservation programs require a full understanding of underlying factors of residential water consumption. However, previous studies have only considered one or several groups of factors without putting them all together in a bigger picture. This study was developed to provide a comprehensive view on these determinants and their relationships, as well as to discuss current gaps and possible directions. Determinants are categorized into six groups: (1) Economic; (2) Socio-demographic; (3) Physical properties; (4) Technological; (5) Climatic; and (6) Spatial drivers. All these determinants produce a very complex picture with many possible interrelationships. This nature, in one hand, poses challenges in selecting suitable technique to avoid autocorrelation, but on the other hand, provides chances to substitute unavailable important data with proxy variables. We have emphasized the lack of regional and cultural diversity in current studies, as most of them were carried out in developed and arid areas. Hence, a wider range of country specific and local-based studies is needed to better reflect the determinants and their relationships in diverse contexts. In future studies, a broader assessment scope taking into account effects such as feedback loop, spillover, and rebound should also be considered. In addition, these studies must deal with modern issues such as balancing between smart monitoring device utilization and consumer privacy.
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- 2018
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36. Mapping Risk of Landslide at A Luoi District, Thua Thien Hue Province, Vietnam by GIS-Based Multi-Criteria Evaluation
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Nguyen Hoang Khanh Linh, Degener, Jan, Nguyen Bich Ngoc, and Chau, Tran Thi Minh
- Subjects
landslide ,A Luoi ,AHP ,Risk and Uncertainty ,GIS ,Land Economics/Use - Abstract
The study was conducted to determine the weight of factors influencing landslides through the algorithm Analytical Hierarchy Process (AHP). These factors were used as inputs for establishing a landslide susceptibility map based on the geographic information technologies (GIS) at A Luoi District, Thua Thien Hue province. Results of the study showed that landslide risk could be divided into five levels: very low risk of landslide covered 17,638.22 ha (14%), low risk areas accounted for 41,036.20 ha (34%), medium risk of landslide covered an area of 22,380.84 ha (18%), high risk area was 27,176.99 ha (22.19%), and very high risk area was about 14,231 ha (12%). The results of this study could be used to support the implementation of land use planning, which could help reduce adverse impact of landslides on people and property.
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- 2018
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37. Mapping biomass and carbon stock of forest by remote sensing and GIS technology at Bach Ma National Park, Thua Thien Hue province
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Nguyen, Hoang Khanh Linh and Nguyen, Bich Ngoc
- Subjects
0301 basic medicine ,National park ,Ecology ,Biomass ,Climate change ,chemistry.chemical_element ,Forestry ,03 medical and health sciences ,030104 developmental biology ,chemistry ,Remote sensing (archaeology) ,Environmental science ,Satellite imagery ,Carbon ,Carbon stock ,Hue - Abstract
The objective of this study is to build biomass and carbon stock map at several type of forest in Bach Ma National Park, Thua Thien Hue province. To accomplish that goal, field survey was accompanied with the interpretation result of remote satellite imagery in the GIS to determine biomass and carbon stock accumulation of forest. Landsat 8 satellite image year 2014 at 15 meters resolution was used for the analysis and classification of forest status. The results showed that the rich forest had the biggest amount biomass reserve in comparison with medium and restoration forest. It indicated that estimated biomass of rich forest was 144.16 tons/ha; meanwhile, biomass of medium and res- toration forest was reached at 43.17 tons/ha and 20.31 tons/ha, respectively. It means that the total biomass of rich forest was approximately three times as the total biomass of medium forest and seven times compared to restoration forest. Based on estimated biomass map, carbon stock map at Bach Ma National Park was calculated. The carbon stock reserve of differential forest types was unequal and considerable disparity between the rich forest and the rest. Carbon stock of rich forest was 264.53 tons/ha, which was higher nearly three times than medium forest and nearly seven times than restoration forest. The determination of biomass and carbon stock map from tree layer not only contributes to understand the status of forest conditions, but also provide a strategy in reducing emissions and adaptation to climate change. In addition, the research results could be the scientific reference for trade sell carbon certificates in the commercial market within the country and globally. Mục tiêu của nghiên cứu này là xây dựng được bản đồ sinh khối và trữ lượng cacbon của tầng cây gỗ tại một số trạng thái rừng thuộc vườn quốc gia Bạch Mã, tỉnh Thừa Thiên Huế. Để thực hiện được mục tiêu đó, nghiên cứu đã phối hợp kết quả phân loại ảnh với số liệu điều tra thực địa trong GIS để xác định sinh khối rừng, trữ lượng carbon tích lũy của tầng cây gỗ ở các trạng thái rừng thuộc vườn quốc gia Bạch Mã, tỉnh Thừa Thiên Huế. Ảnh vệ tinh landsat 8 năm 2014 có độ phân giải 15 mét được sử dụng để phân tích và phân loại hiện trạng rừng. Kết quả nghiên cứu cho thấy, trạng thái rừng giàu có sinh khối lớn hơn nhiều so với 2 trạng thái rừng còn lại, tổng sinh khối ước tính là144,16 tấn/ha. Sinh khối rừng trung bình đạt 43,17 tấn/ha, còn sinh khối rừng của rừng phục hồi là 20,31 tấn/ha. Tổng sinh khối rừng giàu xấp xỉ gấp 3 lần so với rừng trung bình và gấp 7 lần so với rừng phục hồi. Đối với trữ lượng carbon của các trạng thái rừng không đồng đều nhau và có sự chênh lệch khá lớn giữa rừng giàu và các trạng rừng còn lại. Trữ lượng carbon của rừng giàu là 264,53 tấn/ha cao hơn gần gấp 3 so với rừng trung bình và gấp gần 7 lần so với rừng phục hồi. Kết quả việc xác định sinh khối và trữ lượng carbon tầng cây gỗ của các trạng thái rừng cung cấp cơ sở khoa học và tạo điều kiện thuận lợi cho việc buôn bán chứng chỉ carbon trên thị trường thương mại trong phạm vi quốc gia và toàn cầu., Journal of Vietnamese Environment, Vol 8 No 2 (2016)
- Published
- 2017
- Full Text
- View/download PDF
38. Study on biomass and carbon stock of woody floor at several forests in Bach Ma national park, Thua Thien Hue province
- Author
-
Van, Thi Yen, Nguyen, Hoang Khanh Linh, Nguyen, Bich Ngoc, and Le, Quy Tai
- Subjects
0106 biological sciences ,National park ,Ecology ,Forest management ,Diameter at breast height ,Forestry ,010501 environmental sciences ,01 natural sciences ,010601 ecology ,Environmental science ,Ton ,Carbon stock ,0105 earth and related environmental sciences ,Hue - Abstract
The aims of the research are to identify biomass and estimate carbon stock of woody floor at some forest status in Bach Ma National Park and to recommend some solutions in order to improve the effectiveness of forest management toward sustainable development. Collecting the relative data through articles, books, internet information and organizations and inheriting the data from previous research on biomass and carbon stock. Moreover, the research implemented field surveys by designing 31 circular plots (1,256 m2) with three radii including 4 m, 14 m and 20 m for measuring trees from 5 to 20 cm, 20-50 cm and > 50 cm DBH (diameter at breast height), respectively. Correspondingly, D1.3, H were measured. The results showed that biomass of rich, medium and restoration forests are 144.16, 43.17 and 20.31 ton/ ha, respectively. The total average C-stock is calculated as follows: rich forest 264.53 (ton/ha), medium forest (79.21 ton/ha) and restoration forest (37.27 ton/ha). Therefore, the rich forest has the highest CO2 absorption (399.78 ton/ha). Meanwhile, CO2 absorption of medium and restoration forests are 133.13 ton/ha and 46.81 ton/ha. Mục tiêu của đề tài là nghiên cứu sinh khối và trữ lượng carbon của tầng cây gỗ tại một số trạng thái rừng thuộc vườn quốc gia Bạch Mã, tỉnh Thừa Thiên Huế. Để thực hiện được mục tiêu đó, đề tài cần xác định sinh khối của tầng cây gỗ ở một số trạng thái rừng tại vườn quốc gia Bạch Mã, đánh giá trữ lượng carbon của tầng cây gỗ ở một số trạng thái rừng tại vườn quốc gia Bạch Mã, đề xuất một số giải pháp nhằm nâng cao hiệu quả quản lý rừng theo hướng phát triển bền vững. Đề tài tiến hành thu thập các số liệu có liên quan bằng cách tham khỏa tài liệu từ sách báo, internet, tìm kiếm thông tin từ các cơ quan, ban ngành, kế thừa số liệu từ các công trình nghiên cứu sinh khối và trữ lượng carbon. Bên cạnh đó, đề tài còn thực hiện quá trình đi điều tra thực địa lập 31 ô tiêu chuẩn, mỗi ô tiêu chuẩn có diện tích là 1256m2, ô tiêu chuẩn hình tròn với 3 cấp bán kính là 4m, 14m, 20m tương ứng với đường kính cây lần lượt là 5-20cm, 20-50cm và lớn hơn 50 cm. Tiến hành đo các chỉ số sinh trưởng của cây là D1.3, Hvn. Kết quả nghiên cứu cho thấy sinh khối trạng thái rừng giàu chiếm khối lượng lớn nhất khoảng 144,16 tấn/ha, tiếp đến là trạng thái rừng trung bình chiếm 43,17 tấn/ha và rừng phục hồi là 20,31 tấn/ha. Đối với trữ lượng carbon thì rừng giàu là 264,53 tấn/ha, rừng trung bình là 79,21 tấn/ha, rừng phục hồi là 37,27 tấn/ha. Xét về khả năng hấp thụ CO2 thì trạng thái rừng giàu là hấp thụ nhiều nhất khoảng 399,78 tấn/ha, thấp nhất là rừng phục hồi với 46,81 tấn/ha, còn rừng trung bình là 133,13 tấn/ha., Journal of Vietnamese Environment, Vol 8 No 2 (2016)
- Published
- 2016
- Full Text
- View/download PDF
39. Mapping biomass and carbon stock of forest by remote sensing and GIS technology at Bach Ma National Park, Thua Thien Hue province
- Author
-
Nguyen, Hoang Khanh Linh and Nguyen, Bich Ngoc
- Subjects
Bach Ma, Biomasse, CO2 Vorrat, Wald, Remote-Satellit ,ddc:363 ,ddc:7 ,Bach Ma, biomass, CO2 stock, forest, remote satellite - Abstract
The objective of this study is to build biomass and carbon stock map at several type of forest in Bach Ma National Park, Thua Thien Hue province. To accomplish that goal, field survey was accompanied with the interpretation result of remote satellite imagery in the GIS to determine biomass and carbon stock accumulation of forest. Landsat 8 satellite image year 2014 at 15 meters resolution was used for the analysis and classification of forest status. The results showed that the rich forest had the biggest amount biomass reserve in comparison with medium and restoration forest. It indicated that estimated biomass of rich forest was 144.16 tons/ha; meanwhile, biomass of medium and restoration forest was reached at 43.17 tons/ha and 20.31 tons/ha, respectively. It means that the total biomass of rich forest was approximately three times as the total biomass of medium forest and seven times compared to restoration forest. Based on estimated biomass map, carbon stock map at Bach Ma National Park was calculated. The carbon stock reserve of differential forest types was unequal and considerable disparity between the rich forest and the rest. Carbon stock of rich forest was 264.53 tons/ha, which was higher nearly three times than medium forest and nearly seven times than restoration forest. The determination of biomass and carbon stock map from tree layer not only contributes to understand the status of forest conditions, but also provide a strategy in reducing emissions and adaptation to climate change. In addition, the research results could be the scientific reference for trade sell carbon certificates in the commercial market within the country and globally. Mục tiêu của nghiên cứu này là xây dựng được bản đồ sinh khối và trữ lượng cacbon của tầng cây gỗ tại một số trạng thái rừng thuộc vườn quốc gia Bạch Mã, tỉnh Thừa Thiên Huế. Để thực hiện được mục tiêu đó, nghiên cứu đã phối hợp kết quả phân loại ảnh với số liệu điều tra thực địa trong GIS để xác định sinh khối rừng, trữ lượng carbon tích lũy của tầng cây gỗ ở các trạng thái rừng thuộc vườn quốc gia Bạch Mã, tỉnh Thừa Thiên Huế. Ảnh vệ tinh landsat 8 năm 2014 có độ phân giải 15 mét được sử dụng để phân tích và phân loại hiện trạng rừng. Kết quả nghiên cứu cho thấy, trạng thái rừng giàu có sinh khối lớn hơn nhiều so với 2 trạng thái rừng còn lại, tổng sinh khối ước tính là144,16 tấn/ha. Sinh khối rừng trung bình đạt 43,17 tấn/ha, còn sinh khối rừng của rừng phục hồi là 20,31 tấn/ha. Tổng sinh khối rừng giàu xấp xỉ gấp 3 lần so với rừng trung bình và gấp 7 lần so với rừng phục hồi. Đối với trữ lượng carbon của các trạng thái rừng không đồng đều nhau và có sự chênh lệch khá lớn giữa rừng giàu và các trạng rừng còn lại. Trữ lượng carbon của rừng giàu là 264,53 tấn/ha cao hơn gần gấp 3 so với rừng trung bình và gấp gần 7 lần so với rừng phục hồi. Kết quả việc xác định sinh khối và trữ lượng carbon tầng cây gỗ của các trạng thái rừng cung cấp cơ sở khoa học và tạo điều kiện thuận lợi cho việc buôn bán chứng chỉ carbon trên thị trường thương mại trong phạm vi quốc gia và toàn cầu.
- Published
- 2016
40. Study on biomass and carbon stock of woody floor at several forests in Bach Ma national park, Thua Thien Hue province
- Author
-
Van, Thi Yen, Nguyen, Hoang Khanh Linh, Nguyen, Bich Ngoc, and Le, Quy Tai
- Subjects
Biomasse, Bestand, CO2, Wald, Bach Ma National Park ,biomass, stock, CO2, forest, Bach Ma National Park ,ddc:363 ,ddc:7 - Abstract
The aims of the research are to identify biomass and estimate carbon stock of woody floor at some forest status in Bach Ma National Park and to recommend some solutions in order to improve the effectiveness of forest management toward sustainable development. Collecting the relative data through articles, books, internet information and organizations and inheriting the data from previous research on biomass and carbon stock. Moreover, the research implemented field surveys by designing 31 circular plots (1,256 m2) with three radii including 4 m, 14 m and 20 m for measuring trees from 5 to 20 cm, 20-50 cm and > 50 cm DBH (diameter at breast height), respectively. Correspondingly, D1.3, H were measured. The results showed that biomass of rich, medium and restoration forests are 144.16, 43.17 and 20.31 ton/ ha, respectively. The total average C-stock is calculated as follows: rich forest 264.53 (ton/ha), medium forest (79.21 ton/ha) and restoration forest (37.27 ton/ha). Therefore, the rich forest has the highest CO2 absorption (399.78 ton/ha). Meanwhile, CO2 absorption of medium and restoration forests are 133.13 ton/ha and 46.81 ton/ha. Mục tiêu của đề tài là nghiên cứu sinh khối và trữ lượng carbon của tầng cây gỗ tại một số trạng thái rừng thuộc vườn quốc gia Bạch Mã, tỉnh Thừa Thiên Huế. Để thực hiện được mục tiêu đó, đề tài cần xác định sinh khối của tầng cây gỗ ở một số trạng thái rừng tại vườn quốc gia Bạch Mã, đánh giá trữ lượng carbon của tầng cây gỗ ở một số trạng thái rừng tại vườn quốc gia Bạch Mã, đề xuất một số giải pháp nhằm nâng cao hiệu quả quản lý rừng theo hướng phát triển bền vững. Đề tài tiến hành thu thập các số liệu có liên quan bằng cách tham khỏa tài liệu từ sách báo, internet, tìm kiếm thông tin từ các cơ quan, ban ngành, kế thừa số liệu từ các công trình nghiên cứu sinh khối và trữ lượng carbon. Bên cạnh đó, đề tài còn thực hiện quá trình đi điều tra thực địa lập 31 ô tiêu chuẩn, mỗi ô tiêu chuẩn có diện tích là 1256m2, ô tiêu chuẩn hình tròn với 3 cấp bán kính là 4m, 14m, 20m tương ứng với đường kính cây lần lượt là 5-20cm, 20-50cm và lớn hơn 50 cm. Tiến hành đo các chỉ số sinh trưởng của cây là D1.3, Hvn. Kết quả nghiên cứu cho thấy sinh khối trạng thái rừng giàu chiếm khối lượng lớn nhất khoảng 144,16 tấn/ha, tiếp đến là trạng thái rừng trung bình chiếm 43,17 tấn/ha và rừng phục hồi là 20,31 tấn/ha. Đối với trữ lượng carbon thì rừng giàu là 264,53 tấn/ha, rừng trung bình là 79,21 tấn/ha, rừng phục hồi là 37,27 tấn/ha. Xét về khả năng hấp thụ CO2 thì trạng thái rừng giàu là hấp thụ nhiều nhất khoảng 399,78 tấn/ha, thấp nhất là rừng phục hồi với 46,81 tấn/ha, còn rừng trung bình là 133,13 tấn/ha.
- Published
- 2016
41. Applying discriminant model to manage credit risk for consumer loans in Vietnamese commercial bank
- Author
-
NGUYEN THUY DUONG, DO THI THU HA, and NGUYEN BICH NGOC
- Subjects
CONSUMER CREDIT,FINANCIAL DISTRESS,PREDICTION,DEMOGRAPHIC AND SOCIO-ECONOMIC CHARACTERISTICS,TWO-GROUP DISCRIMINANT ANALYSIS,ПОТРЕБИТЕЛЬСКИЙ КРЕДИТ,ФИНАНСОВОЕ НЕБЛАГОПОЛУЧИЕ,ДЕМОГРАФИЧЕСКИЕ И СОЦИАЛЬНО-ЭКОНОМИЧЕСКИЕ ХАРАКТЕРИСТИКИ,БИНАРНЫЙ ДИСКРИМИНАЦИОННЫЙ АНАЛИЗ - Abstract
This study estimates a two-group discriminant function to determine the expected financial health of the consumer credit customers’ of a bank of Vietnam by using five demographic, socio-economic, and loan characteristics of the sample borrowers. The estimated function is significant at one per cent level of significance and the model estimates financial health/group membership with average seventy-three per cent accuracy. Like developed countries, it is expected that use of the estimated discriminant function in the consumer credit decision making will decrease bad debts, will help to set risk based credit pricing for the clients and will make the credit granting faster and more accurate.
- Published
- 2016
42. Strategic Analysis of MB TOOL, s. r. o. Company
- Author
-
Nguyen Bich, Ngoc, Boukal, Petr, and Špička, Jindřich
- Subjects
Financial Analysis ,Micro-environment ,finanční analýza ,mikrookolí ,Macro-environment ,Strategic Analysis ,strategická analýza ,makrookolí - Abstract
The aim of the bachelor´s thesis is to conduct a strategic analysis of MB TOOL, s. r. o. company and within that evaluate the financial health and determine the position of the company on the market. The thesis is divided into two parts, methodical and practical part where there are specifically chosen methods of strategic analysis applied. First, there is the analysis of the company´s external environment, both macro-environment by using PESTLE analysis and also analysis of micro-environment. Within the framework of examining micro-environment there is implemented industry analysis, for analysis of competitive environment there is used Porter´s Five Forces tool. This is followed by the analysis of internal resources and also financial analysis of the company. Lastly, the relationship between external and internal environments is summarized in SWOT analysis.
- Published
- 2015
43. Population Problem of Asia
- Author
-
Nguyen, Bich Ngoc, Jeníček, Vladimír, and Buryan, Šimon
- Subjects
Populační problém ,Populační politika ,Asie ,Asia ,Population politics ,Population problem - Abstract
The topic of this thesis is Population Problem of Asia. The work anylyses not only population development in Asia, but also in the world. A significant part is dedicated to these three countries: PRC, India and Vietnam, where are examined their population politics and current population problems. These countries were successful with slowing down the population growth, but as for PRC and Vietnam ageing and shrinking population is a new phenomen. Moreover, the thesis also mentions future population projections.
- Published
- 2015
44. Management of current land use of perennial industrial crops by NDVI index: A case study in Chu Se District, Gia Lai Province, Vietnam
- Author
-
Nguyen, Hoang Khanh Linh and Nguyen, Bich Ngoc
- Subjects
Geography ,Forestry ,Remote sensing - Abstract
Remote sensing and Geographic Information System (GIS) - an effective tool for managing natural resources, is quite common application in establishing thematic maps. However, the application of this modern technology in natural resource management has not yet been popular in Vietnam, particularly mapping the land use/cover. Currently, land use/cover map is constructed as traditional methods and gets limitations of management counting due to time-consuming for mapping and synthesis the status of land use/cover. Hence, information on the map is often outdated and inaccurate. The main objective of this study is to upgrade the accuracies in mapping current perennial crops in Chu Se District, Gia Lai Province in Vietnam by interpreted NDVI index (Normalized Difference Vegetation Index) from Landsat 8-OLI (Operational Land Imager). The results of study is satisfied the urgent of practical requirement and scientific research. There are 3 types of perennial industrial plants in the study area including rubber, coffee, and pepper, in which most coffee is grown, with an area of over 10,000 hectares. The results also show that integration of remote sensing and GIS technology enables to map current management and distribution of perennial industrial plants timely and accurately. This application is fully consistent with the trend of the world, and in accordance with regulations of established land use/cover map, and the process could be applied at other districts /towns or in higher administrative units. Viễn thám và hệ thông tin địa lý (GIS) là công cụ hữu hiệu để quản lý tài nguyên thiên nhiên, được ứng dụng khá phổ biến để thành lập các loại bản đồ. Tuy nhiên, việc áp dụng công nghệ hiện đại này trong lĩnh vực quản lý tài nguyên thiên nhiên ở Việt Nam chưa phổ biến, nhất là công tác xây dựng bản đồ hiện trạng sử dụng/độ phủ đất. Việc xây dựng bản đồ hiện trạng hiện nay vẫn theo phương pháp truyền thống, thường gặp nhiều hạn chế do thời gian tổng hợp và xây dựng bản đồ hiện trạng kéo dài, dẫn đến thông tin trên bản đồ bị lạc hậu và không chính xác. Mục tiêu chính của nghiên cứu này là nâng cao độ chính xác kết quả giải đoán ảnh viễn thám Landsat 8 bằng chỉ số NDVI (chỉ số khác biệt thực vật) để thành lập bản đồ hiện trạng sử dụng đất cây công nghiệp lâu năm ở huyện Chư Sê, tỉnh Gia Lai, Việt Nam. Từ đó quản lý hiện trạng sử dụng loại đất này phù hợp yêu cầu cấp bách thực tiễn sản xuất và nghiên cứu khoa học. Kết quả của nghiên cứu cho thấy có 3 loại hình cây công nghiệp trên địa bàn nghiên cứu gồm cây cao su, cà phê và hồ tiêu, trong đó cây cà phê được trồng nhiều nhất, với diện tích hơn 10.000 ha. Nghiên cứu cũng cho thấy, tích hợp công nghệ viễn thám và GIS cho phép quản lý hiện trạng và phân bố cây công nghiệp trong không gian một cách hiệu quả và nhanh chóng. Ứng dụng này hoàn toàn phù hợp với xu hướng của thế giới, đồng thời theo đúng quy định thành lập bản đồ hiện trạng sử dụng đất, và quy trình này có thể thực hiện được ở cấp huyện/thị xã hoặc đơn vị hành chính cấp cao hơn., Journal of Vietnamese Environment, Vol 6 No 2 (2014)
- Published
- 2014
- Full Text
- View/download PDF
45. Basin resources management: simulating soil erosion risk by soil and water assessment tool (SWAT) in Ta Trach river watershed, central Vietnam
- Author
-
Nguyen, Bich Ngoc and Nguyen, Hoang Khanh Linh
- Subjects
Hydrology ,Topsoil ,Soil retrogression and degradation ,Land degradation ,Erosion ,Environmental science ,Dryland salinity ,WEPP ,Soil conservation ,Surface runoff - Abstract
Nowadays, one of the urgent issues in the management of river basin resources as land degradation, especially soil erosion risk occurs due to complex factors of climate, cultivation practices of human and impacting of the operation of socio-economic development taking place in the basin. Soil erosion has been considered as the primary cause of soil degradation since soil erosion leads to the loss of topsoil and soil organic matters, which are essential for the growing of plants. Ta Trach river watershed, is a mountainous basin lying to the West - South of Thua Thien Hue province, having complex terrain. The result of this study showed that the amount of sediment yield accounts for high percentage. The average annual sedimentation is 41.60 tones per hectometer in the period of 2005 to 2010, soil erosion were classified by 5 levels. In which, the less deleterious erosion level still occupies high percentage with more than 55 % of watershed area. The main area of less deleterious soil erosion was located at high topography and high slope. The area of deleterious soil erosion occupies percentage lower than 22.63% of the entire basin, but it is also a warning sign to the extent of land degradation taking place in the basin if the erosion rate increases in the future. Ngày nay, một trong những vấn đề cấp bách trong quản lý tài nguyên lưu vực sông là sự thoái hóa đất và đặc biệt là nguy cơ xói mòn đất xảy ra do yếu tố khí hậu phức tạp, phương thức canh tác của con người và tác động của những hoạt động phát triển kinh tế - xã hội đang diễn ra ở lưu vực. Lưu vực sông Tả Trạch là một lưu vực miền núi nằm về phía Tây - Nam của tỉnh Thừa Thiên Huế, có địa hình khá phức tạp. Mục tiêu của nghiên cứu này là ứng dụng công cụ SWAT để mô phỏng xói mòn đất ở lưu vực sông Tả Trạch thuộc tỉnh Thừa Thiên Huế từ năm 2005 đến năm 2010. Kết quả của nghiên cứu cho thấy lượng đất bồi lắng ở lưu vực chiếm tỷ lệ cao, trung bình mỗi năm bồi lắng 41.60 tấn/ha trong giai đoạn 2005 đến 2010, mức độ xói mòn được phân cấp thành 5 cấp xói mòn. Trong đó, mức độ xói mòn ít nguy hại chiếm ở tỷ lệ cao hơn 55 % diện tích lưu vực, chủ yếu phân bố ở những khu vực có địa hình cao, độ dốc lớn. Diện tích xói mòn nguy hại chiếm tỷ lệ thấp hơn 22,63% diện tích toàn lưu vực nhưng đây cũng là một dấu hiệu báo động cho mức độ thoái hóa đất diễn ra ở lưu vực trong tương lai nếu mức xói mòn này tăng lên., Journal of Vietnamese Environment, Vol 6 No 2 (2014)
- Published
- 2014
- Full Text
- View/download PDF
46. Foritin, a new Limonoid from Harrisonia Perforata
- Author
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Mai Van Tri, Nguyen Bich Ngoc, Thierry Sévenet, Huong Do Thi Thu, Marie-Thérèse Martin, and Mary Païs
- Subjects
Chemistry ,Stereochemistry ,visual_art ,visual_art.visual_art_medium ,medicine ,Molecular Medicine ,Harrisonia perforata ,Bark ,Limonoid ,medicine.drug - Abstract
A novel rearranged limonoid, foritin (1), was isolated from the bark of Harrisonia perforata and its structure elucidated by 2D NMR.
- Published
- 2000
- Full Text
- View/download PDF
47. Basin resources management: simulating soil erosion risk by soil and water assessment tool (SWAT) in Ta Trach river watershed, central Vietnam: Research article
- Author
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Nguyen, Bich Ngoc and Nguyen, Hoang Khanh Linh
- Subjects
erosion, GIS, modeling, river basin, SWAT ,ddc:363.7 ,Erosion, GIS, modellieren, Flussbecken, SWAT - Abstract
Nowadays, one of the urgent issues in the management of river basin resources as land degradation, especially soil erosion risk occurs due to complex factors of climate, cultivation practices of human and impacting of the operation of socio-economic development taking place in the basin. Soil erosion has been considered as the primary cause of soil degradation since soil erosion leads to the loss of topsoil and soil organic matters, which are essential for the growing of plants. Ta Trach river watershed, is a mountainous basin lying to the West - South of Thua Thien Hue province, having complex terrain. The result of this study showed that the amount of sediment yield accounts for high percentage. The average annual sedimentation is 41.60 tones per hectometer in the period of 2005 to 2010, soil erosion were classified by 5 levels. In which, the less deleterious erosion level still occupies high percentage with more than 55 % of watershed area. The main area of less deleterious soil erosion was located at high topography and high slope. The area of deleterious soil erosion occupies percentage lower than 22.63% of the entire basin, but it is also a warning sign to the extent of land degradation taking place in the basin if the erosion rate increases in the future. Ngày nay, một trong những vấn đề cấp bách trong quản lý tài nguyên lưu vực sông là sự thoái hóa đất và đặc biệt là nguy cơ xói mòn đất xảy ra do yếu tố khí hậu phức tạp, phương thức canh tác của con người và tác động của những hoạt động phát triển kinh tế - xã hội đang diễn ra ở lưu vực. Lưu vực sông Tả Trạch là một lưu vực miền núi nằm về phía Tây - Nam của tỉnh Thừa Thiên Huế, có địa hình khá phức tạp. Mục tiêu của nghiên cứu này là ứng dụng công cụ SWAT để mô phỏng xói mòn đất ở lưu vực sông Tả Trạch thuộc tỉnh Thừa Thiên Huế từ năm 2005 đến năm 2010. Kết quả của nghiên cứu cho thấy lượng đất bồi lắng ở lưu vực chiếm tỷ lệ cao, trung bình mỗi năm bồi lắng 41.60 tấn/ha trong giai đoạn 2005 đến 2010, mức độ xói mòn được phân cấp thành 5 cấp xói mòn. Trong đó, mức độ xói mòn ít nguy hại chiếm ở tỷ lệ cao hơn 55 % diện tích lưu vực, chủ yếu phân bố ở những khu vực có địa hình cao, độ dốc lớn. Diện tích xói mòn nguy hại chiếm tỷ lệ thấp hơn 22,63% diện tích toàn lưu vực nhưng đây cũng là một dấu hiệu báo động cho mức độ thoái hóa đất diễn ra ở lưu vực trong tương lai nếu mức xói mòn này tăng lên.
- Published
- 2014
48. Management current land use of perennial industrial crops by NDVI index: A case study in Chu Se District, Gia Lai Province, Vietnam: Research article
- Author
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Nguyen, Hoang Khanh Linh and Nguyen, Bich Ngoc
- Subjects
GIS, Karte Landnutzung / -bedeckung, mehrjährige Industriepflanzen, Fernerkundung ,ddc:363.7 ,GIS, land use/cover map, perennial industrial crops, remote sensing - Abstract
Remote sensing and Geographic Information System (GIS) - an effective tool for managing naturalresources, is quite common application in establishing thematic maps. However, the application of this modern technology in natural resource management has not yet been popular in Vietnam, particularly mapping the land use/cover. Currently, land use/cover map is constructed as traditional methods and gets limitations of management counting due to time-consuming for mapping andsynthesis the status of land use/cover. Hence, information on the map is often outdated and inaccurate.The main objective of this study is to upgrade the accuracies in mapping current perennialcrops in Chu Se District, Gia Lai Province in Vietnam by interpreted NDVI index (Normalized Difference Vegetation Index) from Landsat 8-OLI (Operational Land Imager). The results of studyis satisfied the urgent of practical requirement and scientific research. There are 3 types of perennial industrial plants in the study area including rubber, coffee, and pepper, in which most coffee isgrown, with an area of over 10,000 hectares. The results also show that integration of remote sensing and GIS technology enables to map current management and distribution of perennial industrialplants timely and accurately. This application is fully consistent with the trend of the world, and in accordance with regulations of established land use/cover map, and the process could be appliedat other districts /towns or in higher administrative units. Viễn thám và hệ thông tin địa lý (GIS) là công cụ hữu hiệu để quản lý tài nguyên thiên nhiên, được ứng dụng khá phổ biến để thành lập các loại bản đồ. Tuy nhiên, việc áp dụng công nghệ hiện đại này trong lĩnh vực quản lý tài nguyên thiên nhiên ở Việt Nam chưa phổ biến, nhất là công tác xây dựng bản đồ hiện trạng sử dụng/độ phủ đất. Việc xây dựng bản đồ hiện trạng hiện nay vẫn theo phương pháp truyền thống, thường gặp nhiều hạn chế do thời gian tổng hợp và xây dựng bản đồ hiện trạng kéo dài, dẫn đến thông tin trên bản đồ bị lạc hậu và không chính xác. Mục tiêu chính của nghiên cứu này là nâng cao độ chính xác kết quả giải đoán ảnh viễn thám Landsat 8 bằng chỉ số NDVI (chỉ số khác biệt thực vật) để thành lập bản đồ hiện trạng sử dụng đất cây công nghiệp lâu năm ở huyện Chư Sê, tỉnh Gia Lai, Việt Nam. Từ đó quản lý hiện trạng sử dụng loại đất này phù hợp yêu cầu cấp bách thực tiễn sản xuất và nghiên cứu khoa học. Kết quả của nghiên cứu cho thấy có 3 loại hình cây công nghiệp trên địa bàn nghiên cứu gồm cây cao su, cà phê và hồ tiêu, trong đó cây cà phê được trồng nhiều nhất, với diện tích hơn 10.000 ha. Nghiên cứu cũng cho thấy, tích hợp công nghệ viễn thám và GIS cho phép quản lý hiện trạng và phân bố cây công nghiệp trong không gian một cách hiệu quả và nhanh chóng. Ứng dụng này hoàn toàn phù hợp với xu hướng của thế giới, đồng thời theo đúng quy định thành lập bản đồ hiện trạng sử dụng đất, và quy trình này có thể thực hiện được ở cấp huyện/thị xã hoặc đơn vị hành chính cấp cao hơn.
- Published
- 2014
49. The Application of Discriminant Model in Managing Credit Risk for Consumer Loans in Vietnamese Commercial Bank
- Author
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Do Thi Thu Ha, Nguyen Thuy Duong, and Nguyen Bich Ngoc
- Subjects
050208 finance ,Actuarial science ,Variables ,Discriminant model ,General Arts and Humanities ,Vietnamese ,media_common.quotation_subject ,05 social sciences ,General Social Sciences ,Commercial bank ,language.human_language ,Discriminant function analysis ,Loan ,0502 economics and business ,language ,Business ,Salary ,050207 economics ,General Economics, Econometrics and Finance ,Credit risk ,media_common - Abstract
The study focus on analysing financial status of consumer credit customers of Vietnamese commercial banks through two group discriminant function. Five independent variables were used in which some variables are related with the loan and the others are related with the demographic and socio-economic conditions of the borrower. Particularly, the variables related with the demographic and socio-economic conditions of the borrower are age; number of dependents; years at present job and salary while the independent variable related with the loan is loan amount. The result indicates that the estimated function is significant at 1 per cent level of significance and could forecast financial health with average 72.3 per cent accuracy. Therefore, in this study, the demographic, socio-economic and loan related variables can be used to determine the expected group membership of the borrowers in Vietnam.
- Published
- 2017
- Full Text
- View/download PDF
50. Institutions for Agricultural Mitigation: Potential and Challenges in Four Countries
- Author
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Elizabeth Bryan, Nguyen Bich Ngoc, Bruce Sarpong, Khalid El-Harizi, Mohamed Bendaoud, Alessandro De Pinto, Eduardo Mondlane, and Luís Artur
- Subjects
Government ,Land use ,Agriculture ,business.industry ,Corporate governance ,Greenhouse gas ,Resource constraints ,Environmental science ,Developing country ,Lack of knowledge ,business ,Environmental planning - Abstract
The agriculture sector has great potential to contribute to the mitigation of greenhouse gas emissions through changes in agricultural management and land use. However, the technical potential for agricultural mitigation has yet to translate into actual emission reductions due to considerable constraints to the generation of emission offsets through agricultural projects. These constraints include national and subnational policies and institutional structures as well as institutional and resource constraints at the local level, such as lack of knowledge, organizational capacity, and start-up finance. This paper explores the institutional barriers to agricultural mitigation in four developing countries: Ghana, Morocco, Mozambique, and Vietnam. The findings show that the institutional environment greatly influences the capacity to engage in agricultural mitigation activities. In particular, the centrally planned system in Vietnam provides little space for local, communitybased organizations to act collectively around issues of mutual interest, making it difficult to engage numerous smallholders in agricultural mitigation projects. At the same time, government-led mitigation projects may be more feasible in Vietnam compared to the African case studies, where the governments lack well-defined and coordinated strategies and regulations to support mitigation. Governance of contractual obligations is also a challenge to agricultural mitigation. While several organizations in the case study countries have relevant experience for organizing smallholder farmers, most of these organizations lack technical expertise in carbon markets, have limited knowledge of strategies for agricultural mitigation, and lack resources needed for start-up and implementation of mitigation projects.
- Published
- 2012
- Full Text
- View/download PDF
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