77 results on '"Ngo, Thi-Huong"'
Search Results
52. Geology, mineralogy, geochemistry and δ 34 S of sedimentary rock-hosted Au deposits in Song Hien structure, NE Vietnam
- Author
-
Ly Vu Hoang, Ngo Thi Huong, Dung Pham Thi, Peter A. Nevolko, Yury O. Redin, Tran Tuan Anh, Tran Trong Hoa, Ngo Thi Phuong, and V.F. Dultsev
- Subjects
Arsenopyrite ,010504 meteorology & atmospheric sciences ,Chalcopyrite ,Metamorphic rock ,Geochemistry ,Mineralogy ,Geology ,engineering.material ,010502 geochemistry & geophysics ,01 natural sciences ,Devonian ,Sphalerite ,δ34S ,Geochemistry and Petrology ,visual_art ,engineering ,visual_art.visual_art_medium ,Economic Geology ,Sedimentary rock ,Pyrite ,0105 earth and related environmental sciences - Abstract
The Song Hien rift basin is considered to be one of the most important regions of gold mineralisation in North East Vietnam. A number of gold deposits in the Song Hien rift basin are hosted in Triassic and Devonian sedimentary formations of the basin. The largest among them are the Bo Va, Tham Riem and Khung Khoang deposits. The Bo Va deposit is hosted in carbonaceous sedimentary rocks of Triassic age, whereas the Tham Riem and Khung Khoang deposits are hosted in carbonaceous sedimentary rocks of Devonian ages. Based on the mineral composition of the ores, the deposits can be divided into to two types: (i) pyrite dominated and (ii) pyrite-arsenopyrite dominated. The Khung Khoang is of the first type and the Bo Va and Tham Riem deposits belong to the second type. The isotopic composition of pyrite and arsenopyrite in the Tham Riem deposit however, is close to that for the ores of the Bo Va deposit. The δ 34 S value for pyrite ranging from −3.7‰ to −7.4‰ and for arsenopyrite ranging from −3.2‰ to 7.4‰. The δ 34 S of pyrite in the ore from the Khung Khoang deposit however, has a much heavier isotopic composition of +18.9 to +20.2‰. A narrow range of the variation of sulfur isotopic composition of pyrite and arsenopyrite, the presence of visible gold as inclusions, the presence of chalcopyrite, sphalerite and other inclusions in arsenopyrite and pyrite, the large size of the grains of major ore minerals allow us to assume that the primary gold ores of the Bo Va and Tham Riem deposits underwent metamorphic transformations. The absence of arsenic, antimony, mercury and other characteristic elements in the ores of the Khung Khoang deposit, and substantially heavier isotopic composition of sulfur similar to the sulfur isotopic composition of marine sulfates in the Devonian, allow us to assume another source of the ore components, not connected with the Triassic sedimentary rocks of the Song Hien rift.
- Published
- 2017
53. MOVPE growth of buffer layers on 3C-SiC/Si(111) templates for AlGaN/GaN high electron mobility transistors with low RF losses
- Author
-
Frayssinet, Eric, Nguyen, Luan, Lesecq, Marie, Defrance, N., Garcia Barros, Maxime, Comyn, Rémi, Ngo, Thi Huong, Zielinski, Marcin, Portail, Marc, de Jaeger, Jean-Claude, Cordier, Yvon, Centre de recherche sur l'hétéroepitaxie et ses applications (CRHEA), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Puissance - IEMN (PUISSANCE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Photonique Quantique et Moléculaire (LPQM), École normale supérieure - Cachan (ENS Cachan)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), RENATECH, French National Research Agency. Grant Numbers: ANR-16-ASTR-0006-01, ANR-11-LABX-0014, Renatech Network, ANR-16-ASMA-0006,RAFQO 2016,Réseau Actif de Formateurs Quasi-Optiques(2016), and ANR-11-LABX-0014,GANEX,Réseau national sur GaN(2011)
- Subjects
[SPI]Engineering Sciences [physics] ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics - Abstract
International audience; Herein, the interest of cubic silicon carbide as a template for the growth of AlGaN/ GaN high electron mobility transistor (HEMT) heterostructures on silicon substrates for high-frequency operation is shown. On the one hand, 0.6-0.8 μm-thick 3C-SiC grown by chemical vapor deposition on intrinsic silicon substrate having initial resistivity superior to 5 kΩ cm enables the metalorganic vapor phase epitaxy of GaN buffer layers with propagation losses below 0.4 dB mm À1 at 40 GHz and 0.5 dB mm À1 at 67 GHz. On the other hand, an HEMT heterostructure is grown on 1.5 μm-thick 3C-SiC on 4 off-axis silicon substrate having an initial resistivity superior to 200 Ω cm that allows to keep a sufficiently resistive epilayer stack limiting the loss up to 0.78 dB mm À1 at 40 GHz. Device process developed on a piece of the 100 mm diameter wafer leads to the demonstration of DC transistor operation with low leakage currents. Compared with direct growth on silicon, these templates enable reduced radio frequency (RF) propagation losses that are very interesting for high-frequency transistors and circuits operation.
- Published
- 2019
54. Selective GaN sublimation and local area regrowth for co-integration of enhancement mode and depletion mode Al(Ga)N/GaN high electron mobility transistors
- Author
-
Flavien Cozette, Nathalie Labat, Benjamin Damilano, Stéphane Vézian, Sébastien Chenot, F. Lecourt, Nicolas Defrance, Eric Frayssinet, Yvon Cordier, Julien Brault, Rémi Comyn, Hassan Maher, Christophe Rodriguez, Ngo Thi Huong, Centre de recherche sur l'hétéroepitaxie et ses applications (CRHEA), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), Université Côte d'Azur (UCA), Institut Interdisciplinaire d'Innovation Technologique [Sherbrooke] (3IT), Université de Sherbrooke (UdeS), Laboratoire Nanotechnologies et Nanosystèmes [Sherbrooke] (LN2), Université de Sherbrooke (UdeS)-École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-École supérieure de Chimie Physique Electronique de Lyon (CPE)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Puissance - IEMN (PUISSANCE - IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), This work was supported by French technology facility network RENATECH and the French National Research Agency (ANR) through the projects ED-GaN (ANR-16-CE24-0026-02) and the 'Investissements d'Avenir' program GaNeX (ANR-11-LABX-0014)., Renatech Network, ANR-16-CE24-0026,ED-GaN,Co-intégration des transistors GaN à enrichissement et à déplétion pour les circuits de communication RF de la prochaine génération(2016), ANR-11-LABX-0014,GANEX,Réseau national sur GaN(2011), Université Nice Sophia Antipolis (1965 - 2019) (UNS), Université de Lyon-Université de Lyon-École Supérieure de Chimie Physique Électronique de Lyon (CPE)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), and Université catholique de Lille (UCL)-Université catholique de Lille (UCL)
- Subjects
[PHYS]Physics [physics] ,010302 applied physics ,Materials science ,business.industry ,Transistor ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Electronic, Optical and Magnetic Materials ,law.invention ,law ,0103 physical sciences ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,Materials Chemistry ,Optoelectronics ,Sublimation (phase transition) ,[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] ,Electrical and Electronic Engineering ,0210 nano-technology ,business ,High electron - Abstract
In this paper, we report on the fabrication of a normally-off Al(Ga)N/GaN high electron mobility transistor with selective area sublimation under vacuum of the p type doped GaN cap layer. This soft method makes it possible to avoid damages otherwise induced by post processing with reactive ion etching techniques. The GaN evaporation selectivity is demonstrated on AlN as well as on AlGaN barrier layers. Furthermore, by properly choosing the AlGaN barrier thickness and composition it is possible to co-integrate a normally-off with a normally-on device on the same substrate. Finally, a local area regrowth of AlGaN can complement this process to increase the maximum drain current in the transistors.
- Published
- 2020
55. The microstructure, local indium composition and photoluminescence in green-emitting InGaN/GaN quantum wells
- Author
-
Chery, Nicolas, Ngo, Thi Huong, Chauvat, M.P., Damilano, B., Courville, A, Ruterana, Pierre, Gil, Bernard, de Mierry, P., Grieb, Tim, Mehrtens, Thorsten, Krause, Florian, Müller-Caspary, Knut, Schowalter, Marco, Rosenauer, Andreas, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique de l'Exciton, du Photon et du Spin (PEPS), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur l'hétéroepitaxie et ses applications (CRHEA), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), Laboratoire de cristallographie et sciences des matériaux (CRISMAT), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Universität Bremen, and ANR-11-LABX-0014,GANEX,Réseau national sur GaN(2011)
- Subjects
III-nitrides semiconductors ,Quantum wells ,Semiconductors ,Green LEDs ,Thin films ,[PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other] ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,Analytical STEM - Abstract
In this work, we analyse the microstructure and local chemical composition of green-emitting InxGa1-xN/GaN quantum well (QW) heterostructures in correlation with their emission properties. Two samples of high structural quality grown by metalorganic vapour phase epitaxy (MOVPE) with a nominal composition of x = 0.15 and 0.18 indium are discussed. The local indium composition is quantitatively evaluated by comparing scanning transmission electron microscopy (STEM) images to simulations and the local indium concentration is extracted from intensity measurements. The calculations point out that the measured indium fluctuations may be correlated to the large width and intensity decrease of the PL emission peak.
- Published
- 2018
56. Enhanced excitonic emission efficiency in porous GaN and GalnN-GaN quantum wells grown along the polar direction
- Author
-
Ngo, Thi Huong, primary, Gil, Bernard, additional, Shubina, Tatiana V., additional, Valvin, Pierre, additional, Damilano, Benjamin, additional, Vezian, Stephane, additional, and Massies, Jean, additional
- Published
- 2019
- Full Text
- View/download PDF
57. Optimisation du rendement quantique des dispositifs luminescents à base de nitrures opérant du jaune au rouge
- Author
-
Ngo, Thi Huong, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université Montpellier, and Bernard Gil
- Subjects
Modelization ,Semiconducteurs ,Semiconductors ,[PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other] ,Optical spectroscopy ,Diodes électroluminescentes ,Spectroscopie optique ,Modelisation ,Light emitting diodes - Abstract
Non renseigné; Ce travail de doctorat est dédié à l’étude des mécanismes régissant l’interaction lumière-matière dans des dispositifs optoélectroniques à base d’alliages (Al,Ga,In,)N. Diverses compositions de ces alliages sont assemblées en structures multicouches de matériaux d’épaisseurs nanométriques afin d’obtenir une émission à plus grande longueur d’onde que le bleu, couleur pour laquelle la technologie est mature depuis plus de vingt ans. Il s’agit de réaliser des émetteurs efficaces de lumière jaune, verte ou blanche (avec une approche alternative au pompage optique de luminophore par une diode bleue). Les solutions solides assemblées pour obtenir des émissions à grandes longueur d’onde sont à base de GaN et de Ga0.8In0.2N, matériaux pour lesquels les mailles cristallographiques sont désaccordées. Lorsqu’elles sont déposées sur un substrat ou un pseudo-substrat de GaN, matériau pour lequel les dopages n et p sont maitrisés et permettent l’injection électrique des porteurs, les tranches de Ga0.8In0.2N subissent de très fortes compressions dans leur plan de croissance et l’énergie élastique est relaxée par la formation de défauts délétères pour le rendement lumineux. Nous avons construit des hétéro-structures plus complexes en intercalant une couche complémentaire d’Al0.2Ga0.8N afin de réduire la densité d’énergie élastique globale. L’insertion de telles couches améliore la qualité cristalline et augmente leur rendement optique. Nous avons mesuré le rendement quantique interne en utilisant la spectroscopie de photoluminescence résolue en temps et une analyse des temps de déclins par une approche de type Lotka-Volterra des équations de recombinaison pour obtenir les taux de recombinaisons radiatifs et non-radiatifs. Nous avons montré quantitativement comment les champs électriques internes résultant du contraste de polarisation électrique aux interfaces et les recombinaisons non-radiatives de type Schockley-Read-Hall contribuent à définir le rendement quantique à faible densité d’excitations (optique ou électrique). L’objectif est l’obtention d’une émission spontanée intense pour une densité d’excitation modérée. Nous avons donc conduit une campagne d’expériences en variant l’intensité d’injection. Nous avons montré que l’effet Auger est le facteur dominant régissant la chute du rendement quantique interne sous fortes densités d’injection. Nous avons étudié diverses architectures à simple puits quantique ou à puits quantiques multiples émettant à des longueurs d’onde identiques pour quantifier l’influence spécifique de l’effet Stark confiné quantique. Nous avons corrélé l’apparition d’un seuil d’excitation au-delà duquel domine la recombinaison non-radiative de type Auger avec l’augmentation du temps de recombinaison radiative et de l’énergie de localisation des porteurs dans l’alliage inhomogène. Nous arrivons à la conclusion que la localisation des porteurs produite par le champ électrique aux interfaces et les fluctuations de la composition chimique de Ga0.8In0.2N contribuent de concert, facilitant l’interaction répulsive électron-électron et la recombinaison non-radiative Auger nnp. Nous avons montré que le modèle ABC permet de bien décrire la physique du phénomène si ses trois paramètres tiennent compte des effets d’écrantages sous injections modérées et des effets de remplissage de l’espace des phases sous fortes injections. Enfin, nous nous sommes écartés de l’étude des structures traditionnellement épitaxiées selon le plan polaire (0001) pour choisir des plans d’épitaxie semi-polaire (11-22). Dans ces conditions, il a été nécessaire de fabriquer des puits quantiques en Ga0.65In0.35N. Nous avons montré que la quasi-absence d’effet Stark confiné quantique augmente de manière très significative le seuil d’excitation au-delà duquel domine la recombinaison non-radiative de type Auger. Cette amélioration par rapport aux échantillons épitaxiés selon le plan (0001) est d’autant plus marquée que la longueur d’onde émise est grande.
- Published
- 2017
58. Ganglioside Hp-s1 Analogue Inhibits Amyloidogenic Toxicity in Alzheimer’s Disease Model Cells
- Author
-
Tsai, Yow-Fu, primary, Yang, Dun-Jhu, additional, Ngo, Thi Huong, additional, Shih, Cheng-Hua, additional, Wu, Yu-Fa, additional, Lee, Ching-Kuo, additional, Phraekanjanavichid, Veerapol, additional, Yen, Shu-Fen, additional, Kao, Shu-Huei, additional, Lee, Horng-Mo, additional, Huang, Vivian Shuhsien, additional, Shieh, Jonathan Chang-Cheng, additional, and Lin, Yung-Feng, additional
- Published
- 2018
- Full Text
- View/download PDF
59. SYNTHESIS OF CdSe/CdS AND CdSe/CdS/SiO2 NANOPARTICLES VIA WET CHEMICAL METHOD
- Author
-
Ngo Thi Huong, Tran Hong Nhung, Chu Viet Ha, Hoang Thi Hang, Vu Thi Kim Lien, and Nguyen Thi Bich Ngoc
- Subjects
Materials science ,Chemical engineering ,Sio2 nanoparticles - Published
- 2015
60. Multilocus nuclear DNA markers reveal population structure and demography ofAnopheles minimus
- Author
-
Ngo Thi Huong, Uraiwan Arunyawat, Jyotsana Dixit, and Aparup Das
- Subjects
Gene Flow ,Genetic Markers ,X Chromosome ,Range (biology) ,Lineage (evolution) ,Molecular Sequence Data ,Population ,India ,Single-nucleotide polymorphism ,Biology ,DNA, Mitochondrial ,Polymorphism, Single Nucleotide ,Linkage Disequilibrium ,Nucleotide diversity ,Anopheles ,Genetic variation ,Genetics ,Animals ,education ,Asia, Southeastern ,Ecology, Evolution, Behavior and Systematics ,Cell Nucleus ,Population Density ,education.field_of_study ,Genetic Variation ,Sequence Analysis, DNA ,Phylogeography ,Genetics, Population ,Genetic marker ,Demography - Abstract
Utilization of multiple putatively neutral DNA markers for inferring evolutionary history of species population is considered to be the most robust approach. Molecular population genetic studies have been conducted in many species of Anopheles genus, but studies based on single nucleotide polymorphism (SNP) data are still very scarce. Anopheles minimus is one of the principal malaria vectors of Southeast (SE) Asia including the Northeastern (NE) India. Although population genetic studies with mitochondrial genetic variation data have been utilized to infer phylogeography of the SE Asian populations of this species, limited information on the population structure and demography of Indian An. minimus is available. We herewith have developed multilocus nuclear genetic approach with SNP markers located in X chromosome of An. minimus in eight Indian and two SE Asian population samples (121 individual mosquitoes in total) to infer population history and test several hypotheses on the phylogeography of this species. While the Thai population sample of An. minimus presented the highest nucleotide diversity, majority of the Indian samples were also fairly diverse. In general, An. minimus populations were moderately substructured in the distribution range covering SE Asia and NE India, largely falling under three distinct genetic clusters. Moreover, demographic expansion events could be detected in the majority of the presently studied populations of An. minimus. Additional DNA sequencing of the mitochondrial COII region in a subset of the samples (40 individual mosquitoes) corroborated the existing hypothesis of Indian An. minimus falling under the earlier reported mitochondrial lineage B.
- Published
- 2014
61. Polar and semi-polar oriented InGaN-(In)GaN multiple quantum wells for red-light emitters (Conference Presentation)
- Author
-
Ngo, Thi Huong, primary, Gil, Bernard, additional, Damilano, Benjamin, additional, Courville, Aimeric, additional, and De Mierry, Philippe, additional
- Published
- 2018
- Full Text
- View/download PDF
62. DUV LEDs based on AlGaN quantum dots
- Author
-
Fujioka, Hiroshi, Morkoç, Hadis, Schwarz, Ulrich T., Brault, Julien, Al Khalfioui, Mohamed, Leroux, Mathieu, Matta, Samuel, Ngo, Thi-Huong, Zaiter, Aly, Courville, Aimeric, Damilano, Benjamin, Chenot, Sébastien, Duboz, Jean-Yves, Massies, Jean, Valvin, P., and Gil, Bernard
- Published
- 2021
- Full Text
- View/download PDF
63. Nutritional Characteristics and Feeding of Rabbitfish (Siganus guttatus) in Tam Giang-Cau Hai Lagoon Systems
- Author
-
Nguyen Van Hue, Nguyen Quang Linh, Ngo Thi Huong Giang, Kieu Thi Huyen, and Tran Nguyen Ngoc
- Subjects
Food group ,Larva ,biology ,Algae ,Ecology ,Animal feed ,Zoology ,Omnivore ,Vegetation ,Siganus guttatus ,biology.organism_classification ,Rabbitfish - Abstract
The research aimed to investigate for lagoon foodweb and dietary composition for rabbitfish in different stages (larvae, fingerlings and grower). Data were collected from two experiments using basic methods in field and laboratory. Experiments were structured on 2,000 larval head, 500 each tanks for nursery and 90 heads of three groups were collected in different seasons to laboratories for analysis of feeding intake and food compositions. Results showed that the number of omnivorous species, including animals, plants and organics, have been identified and grouped in 39 genera, 30 families, 23 sets, 8 classes and 6 branches. Animal groups have been identified as 18 breeds, 18 families, 13 lines, 3 classes and 3 animal species of industry animal. Plant foodweb, mainly Bacillariophyta, have accounted for 27 genera and 67.5% of total expenditure vegetation eaten by the rabbitfish. For the animal feed industry joint foot, Arthropoda have the highest number of 15 varieties, accounting for 83.3% of the animal’s nutritional ratio. Organic residues as food for species have the highest prevalence in digestive tract (94.4%). The dominant food groups were determined as 15 genera and 5 animal breeds, particularly those large groups of algae.
- Published
- 2015
64. Ov-APR-1, an aspartic protease from the carcinogenic liver fluke, Opisthorchis viverrini: Functional expression, immunolocalization and subsite specificity
- Author
-
Paul J. Brindley, Ngo Thi Huong, Sasithorn Kaewkes, Sopit Wongkham, Jason Mulvenna, Thewarach Laha, Sutas Suttiprapa, Mark S. Pearson, Banchob Sripa, and Alex Loukas
- Subjects
Protein Folding ,Molecular Sequence Data ,Cyprinidae ,Serum albumin ,Cathepsin D ,Biochemistry ,Article ,Substrate Specificity ,law.invention ,Hemoglobins ,law ,Cricetinae ,Escherichia coli ,Animals ,Aspartic Acid Endopeptidases ,Humans ,Amino Acid Sequence ,Opisthorchis viverrini ,Cloning, Molecular ,Bovine serum albumin ,Cathepsin ,biology ,Opisthorchis ,Serum Albumin, Bovine ,Cell Biology ,Liver fluke ,biology.organism_classification ,Immunohistochemistry ,Molecular biology ,Recombinant Proteins ,Enzyme assay ,biology.protein ,Recombinant DNA - Abstract
The human liver fluke Opisthorchis viverrini is endemic in Thailand, Laos and Cambodia where long standing infection is associated with cancer of the bile ducts, cholangiocarcinoma. Here we describe a cathepsin D-like aspartic protease from the gut and other tissues in O. viverrini. Phylogenetic analysis indicated that Ov-APR-1 is cathepsin D-like, conforming with Clan AA, Family A1 of the MEROPS classification. Ov-APR-1 is expressed in the gut of the mature hermaphroditic parasite, in the reproductive tissues including the testis and immature spermatids, and the developing miracidium within the eggshell. The enzyme was also detected in the excretory/secretory products of cultured adult flukes, indicating a role in host-parasite relationships. A recombinant form of the enzyme expressed in Escherichia coli and refolded from denatured inclusion bodies underwent autocatalytic activation and demonstrated hydrolytic activity against the peptide substrate 7-methoxycoumarin-4-acetyl-GKPILFFRLK(DNP)-D-Arg-amide with a k(cat)/K(m)=1.7 x 10(4)M(-1)s(-1) and a pH optimum around pH 2.5-3.0. The recombinant enzyme digested hemoglobin and bovine serum albumin. Forty-six serum albumin peptides were detected after digestion with recombinant Ov-APR-1 and sequenced. Like many other aspartic proteases, Ov-APR-1 displayed promiscuous preferences for residues accommodated at the key subsites of the binding pocket although hydrophobic (Leu, Ala, Ile), positively charged (Lys) and bulky aromatic (Phe) residues, in that order, were preferred at P1. Similar residues were accommodated at P1' although even less selectivity was exerted at this position.
- Published
- 2009
65. Photo-induced droop in blue to red light emitting InGaN/GaN single quantum wells structures
- Author
-
Ngo, Thi Huong, primary, Gil, Bernard, additional, Damilano, Benjamin, additional, Valvin, Pierre, additional, Courville, Aimeric, additional, and de Mierry, Philippe, additional
- Published
- 2017
- Full Text
- View/download PDF
66. Photo-induced droop in blue to red light-emitting GaInN-GaN heterostructures (Conference Presentation)
- Author
-
Ngo, Thi Huong, primary, Gil, Bernard, additional, Damilano, Benjamin, additional, Courville, Aimeric, additional, and De Mierry, Philippe, additional
- Published
- 2017
- Full Text
- View/download PDF
67. Ultraviolet light emitting diodes using III-N quantum dots
- Author
-
Brault, Julien, primary, Matta, Samuel, additional, Ngo, Thi-Huong, additional, Rosales, Daniel, additional, Leroux, Mathieu, additional, Damilano, Benjamin, additional, Khalfioui, Mohamed Al, additional, Tendille, Florian, additional, Chenot, Sébastien, additional, De Mierry, Philippe, additional, Massies, Jean, additional, and Gil, Bernard, additional
- Published
- 2016
- Full Text
- View/download PDF
68. Geology, geochemistry and sulphur isotopes of the Hat Han gold–antimony deposit, NE Vietnam
- Author
-
Tran, Trong Hoa, primary, Nevolko, P.A., additional, Ngo, Thi Phuong, additional, Svetlitskaya, T.V., additional, Vu, Hoang Ly, additional, Redin, Yu.O., additional, Tran, Tuan Anh, additional, Pham, Thi Dung, additional, and Ngo, Thi Huong, additional
- Published
- 2016
- Full Text
- View/download PDF
69. Asymmetrical radiation pattern synthesis of a linear array antenna by a least mean square method
- Author
-
Yoshihide Yamada, Ngo Thi Huong, Naobumi Michishita, Le Mai Ngoc Quynh Trang, and Nguyen Quoc Dinh
- Subjects
business.industry ,Computer science ,Reflective array antenna ,Acoustics ,Electrical engineering ,Slot antenna ,Collinear antenna array ,Radiation pattern ,law.invention ,Side lobe ,law ,Sector antenna ,Dipole antenna ,Antenna (radio) ,business - Abstract
In mobile base station antennas, linear array antennas are employing and asymmetrical radiation patterns are achieved. For multi frequency use, unequally spaced array configurations are preferable because of reducing grating lobes in higher frequency operations. Previously, radiation pattern synthesis methods were developed for equally spaced array configurations. In radiation pattern synthesis method, the least mean square (LMS) method was very conveniently used in mobile base station designing. The convenience of this method is obtaining array excitation coefficients by simply giving the objective radiation pattern. Moreover, the merit of this method is having the function of emphasizing design importance in the radiation angles that is called the weighting matrix. In this paper, a radiation pattern synthesis program based on LMS scheme is developed for unequally spaced array configuration. As an initial step, the accuracies of a developed program are examined. Through designing actual asymmetric radiation pattern with very low side lobe levels, the accuracies of program and effects of weighting matrix are ensured.
- Published
- 2014
70. Ganglioside Hp-s1 Analogue Inhibits Amyloidogenic Toxicity in Alzheimer's Disease Model Cells.
- Author
-
Tsai, Yow-Fu, Yang, Dun-Jhu, Ngo, Thi Huong, Shih, Cheng-Hua, Wu, Yu-Fa, Lee, Ching-Kuo, Phraekanjanavichid, Veerapol, Yen, Shu-Fen, Kao, Shu-Huei, Lee, Horng-Mo, Huang, Vivian Shuhsien, Shieh, Jonathan Chang-Cheng, and Lin, Yung-Feng
- Published
- 2019
- Full Text
- View/download PDF
71. Proposal of two ultra-wide band antennas for UWB-MIMO
- Author
-
Ngo Thi Huong, Le Trong Trung, and Nguyen Quoc Dinh
- Subjects
Reconfigurable antenna ,Directional antenna ,business.industry ,Computer science ,Antenna measurement ,Slot antenna ,Collinear antenna array ,law.invention ,Biconical antenna ,Optics ,law ,Dipole antenna ,Telecommunications ,business ,Monopole antenna - Abstract
In this paper, the authors propose 2 structures of UWB antennas: one operates as a magnetic dipole with the size of 15 mm × 26 mm × 1.6 mm and the other operates as an electric dipole with the size of 9 mm × 64 mm × 1.6 mm. The proposed antennas can work in the frequency band 3.1–10.6 GHz with VSWR ≤ 2. They also can be used in MIMO system to reduce the mutual coupling between antenna elements.
- Published
- 2013
72. Molecular population genetics of the NADPH cytochrome P450 reductase (CPR) gene in Anopheles minimus
- Author
-
Uraiwan Arunyawat, Aparup Das, Ngo Thi Huong, and Hemlata Srivastava
- Subjects
Population ,Molecular Sequence Data ,Population genetics ,Genes, Insect ,Plant Science ,Biology ,Nucleotide diversity ,Evolution, Molecular ,parasitic diseases ,Anopheles ,Genetics ,medicine ,Animals ,education ,Gene ,NADPH-Ferrihemoprotein Reductase ,Genetic diversity ,education.field_of_study ,Natural selection ,Polymorphism, Genetic ,Base Sequence ,General Medicine ,medicine.disease ,Phylogeography ,Insect Science ,Animal Science and Zoology ,Adaptation ,Malaria - Abstract
Development of insecticide resistance (IR) in mosquito vectors is a primary huddle to malaria control program. Since IR has genetic basis, and genes constantly evolve with response to environment for adaptation to organisms, it is important to know evolutionary pattern of genes conferring IR in malaria vectors. The mosquito Anopheles minimus is a major malaria vector of the Southeast (SE) Asia and India and is susceptible to all insecticides, and thus of interest to know if natural selection has shaped variations in the gene conferring IR. If not, the DNA fragment of such a gene could be used to infer population structure and demography of this species of malaria vector. We have therefore sequenced a ~569 bp DNA segment of the NADPH cytochrome P450 reductase (CPR) gene (widely known to confer IR) in 123 individuals of An. minimus collected in 10 different locations (eight Indian, one Thai and one Vietnamese). Two Indian population samples were completely mono-morphic in the CPR gene. In general, low genetic diversity was found with no evidence of natural selection in this gene. The data were therefore analyzed to infer population structure and demography of this species. The 10 populations could be genetically differentiated into four different groups; the samples from Thailand and Vietnam contained high nucleotide diversity. All the 10 populations conform to demographic equilibrium model with signature of past population expansion in four populations. The results in general indicate that the An. minimus mosquitoes sampled in the two SE Asian localities contain several genetic characteristics of being parts of the ancestral population.
- Published
- 2013
73. Auger effect in yellow light emitters based on InGaN–AlGaN–GaN quantum wells
- Author
-
Ngo, Thi Huong, primary, Gil, Bernard, additional, Valvin, Pierre, additional, Damilano, Benjamin, additional, Lekhal, Kaddour, additional, and De Mierry, Philippe, additional
- Published
- 2016
- Full Text
- View/download PDF
74. Investigation of AlyGa1− yN/Al0.5Ga0.5N quantum dot properties for the design of ultraviolet emitters
- Author
-
Brault, Julien, primary, Matta, Samuel, additional, Ngo, Thi-Huong, additional, Korytov, Maxim, additional, Rosales, Daniel, additional, Damilano, Benjamin, additional, Leroux, Mathieu, additional, Vennéguès, Philippe, additional, Al Khalfioui, Mohamed, additional, Courville, Aimeric, additional, Tottereau, Olivier, additional, Massies, Jean, additional, and Gil, Bernard, additional
- Published
- 2016
- Full Text
- View/download PDF
75. Internal quantum efficiency in yellow-amber light emitting AlGaN-InGaN-GaN heterostructures
- Author
-
Ngo, Thi Huong, primary, Gil, Bernard, additional, Valvin, Pierre, additional, Damilano, Benjamin, additional, Lekhal, Kaddour, additional, and De Mierry, Philippe, additional
- Published
- 2015
- Full Text
- View/download PDF
76. Synthesis and comparative behaviour study of fluorocarbon and hydrocarbon cationic surfactants in aqueous media
- Author
-
Ngo, Thi Huong Viet, primary, Damas, Christine, additional, Naejus, Régine, additional, and Coudert, Robert, additional
- Published
- 2010
- Full Text
- View/download PDF
77. Impact of Climate Change on Aquaculture in Phu Vang District, Thua Thien Hue Province, Vietnam.
- Author
-
Mac Nhu Binh, Le Van An, Nguyen Thi Thanh Thuy, Ngo Thi Huong Giang, Ho Thi Thu Hoai, and Dan, Truong Van
- Subjects
CLIMATE change ,AQUACULTURE ,SUSTAINABLE development ,COMMUNITIES - Abstract
Climate change is a major global concern that greatly affects people, including their source of living. In 2010, the Asian Development Bank reported that Vietnam is one of the five countries most severely affected by climate change. About 70 percent of the country's total population lives along coastal areas and in islands. This study aimed to (1) evaluate the impacts of climate change on aquaculture in Phu Vang district (Thua Thien Hue province, Vietnam), and (2) develop a climate change adaptation model for aquaculture. Data on impact of climate change to aquaculture production were gathered through participatory rural appraisal tools, while spatial changes in water quality were determined through Geographic Information System (GIS). Experimental polyculture models were set up in the five study-site communes to determine the aquaculture practices that could be disseminated to small farmers. It was found out that Phu Vang had suffered heavy losses from climate change brought about by a combination of droughts and prolonged heat waves, and cold weather that lasted longer. Floods and typhoons have likewise occurred with stronger intensities, and tide amplitude has changed drastically. All these affected agricultural activities, especially aquaculture, which is considered as one of the most vulnerable sectors to climate change impacts. As a result, many households shifted from intensive to extensive culture, and some even left their ponds for other jobs. The limited understanding and capacity of people on climate change aggravated the situation, affecting their ability to respond and mitigate negative impacts. Water quality, specifically for aquaculture, was also affected as a result of rising temperature, prolonged droughts, rainfall, flooding, and salinization, which in turn reduced productivity and yield. Meanwhile, polyculture models of aquaculture implemented for this study brought high economic returns, and could be promising to replicate in various communes of Phu Vang district. The following are the primary recommendations to mitigate climate change impact in aquaculture and to facilitate sustainable livelihood for coastal people: capacitate communities and government in climate change adaptation and mitigation; expand promising aquaculture practices, area, infrastructure, and marketing of produce; and implement policies to mitigate damages of climate change to aquaculture and the community as a whole. [ABSTRACT FROM AUTHOR]
- Published
- 2016
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.