21 results on '"Meiping Gao"'
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2. Financial Big Data Intelligent Service System Based on Cloud Computing of Internet of Things
- Author
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Meiping Gao, Qingfang He, and Xiaoping Ruan
- Subjects
Article Subject ,Computer Networks and Communications ,Computer Science Applications - Abstract
The financial big data intelligent service system belongs to the technical field of financial data management. It is an innovation of the client and server of the financial service system, which promotes the electronic office of the financial system. This paper aimed to analyze the cloud computing means of the Internet of things (IoT), select a more suitable specific algorithm, and conduct an in-depth study of the financial big data intelligent service system so that it can better serve the current financial situation. This paper gave a general introduction to the cloud computing of the Internet of things, researched and analyzed the financial big data intelligent service system machine, and applied the cloud computing of the Internet of things to the research of the financial big data intelligent service system. Based on the experiments in this paper, it can be seen that among the students in the three colleges and universities in place A, 567 people thought that they can adapt to the intelligent financial system better than the already employed salesmen, and 245 people held a negative attitude. It showed that the intelligent development of financial systems is a trend, but at the same time, it is also a development trend to strengthen the business training capabilities of professionals. The experimental results of this paper showed that the process of studying the financial big data intelligent service system based on the cloud computing of the IoT is more scientific and effective than using other means to analyze the experimental data, and it has greater reference significance for the intelligent development of the financial system.
- Published
- 2023
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3. Emission factors and emission inventory of volatile organic compounds (VOCs) from hair products application in hair salons in Beijing through measurement
- Author
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Meiping Gao, Wenwen Liu, Xiaoshuan An, Lei Nie, Zhenxia Du, Panjin Chen, and Xiaoyu Liu
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Environmental Engineering ,Environmental Chemistry ,Pollution ,Waste Management and Disposal - Published
- 2023
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4. Influence of temperature on formaldehyde emission parameters of solvent-based coatings
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Li’an Hou, Zhanjun Cheng, Beibei Yan, Lei Nie, Guanyi Chen, Meiping Gao, Yatao Zhi, and Tan Yaoyao
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chemistry.chemical_classification ,Work (thermodynamics) ,Materials science ,Diffusion ,Environmental chamber ,Formaldehyde ,Analytical chemistry ,02 engineering and technology ,Surfaces and Interfaces ,General Chemistry ,engineering.material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,Solvent ,Partition coefficient ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,chemistry ,Coating ,engineering ,Volatile organic compound ,0210 nano-technology - Abstract
Temperature affects the emission behavior of formaldehyde from coatings. Initial emittable concentration (C0), diffusion coefficient (Dm) and partition coefficient (K) are three key parameters for characterizing the formaldehyde emission from coatings. However, recent research concerning temperature effect on volatile organic compound (VOC) emission from coatings mainly focused on the influence on gas-phase concentration or emission rate, and few studies were conducted on the correlation between temperature and key emission factors (C0, Dm and K). In this work, formaldehyde emission from a solvent-based coating was measured at 10, 15, 20 and 25°C in a 30 L environmental chamber. From 10 to 25°C, C0 increased by 2.35-fold, and positive linear correlation was observed between ln(C0*T0.5) and 1/T. An empirical equation characterizing temperature effect on K was derived. Temperature effects on Dm were negligible. Through the obtained equations that can characterize the correlation between temperature and the key parameters, C0 and K at different temperatures from this work can be easily calculated. This study would be useful for predicting emission behavior of formaldehyde from solvent-based coatings and better understanding the influence of temperature.
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- 2021
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5. Characteristics, Ozone and Soa Formation Potentials and Health Risk Assessment of Vocs in Hair Cosmetic Products (Hcps) in Beijing
- Author
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Panjin Chen, Wenwen Liu, Lei Nie, Zhenxia Du, and Meiping Gao
- Subjects
History ,Polymers and Plastics ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2022
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6. SMRT and Illumina RNA-Seq Identifies Potential Candidate Genes Related to the Double Flower Phenotype and Unveils SsAP2 as a Key Regulator of the Double-Flower Trait in
- Author
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Meiping, Gao, Wen, Jiang, Zhicheng, Lin, Qian, Lin, Qinghua, Ye, Wei, Wang, Qian, Xie, Xinhua, He, Cong, Luo, and Qingxi, Chen
- Subjects
Plant Breeding ,Sagittaria ,Phenotype ,Gene Expression Regulation, Plant ,High-Throughput Nucleotide Sequencing ,Flowers ,RNA-Seq ,Genes, Plant ,Transcriptome - Abstract
Double flowers are one of the important objectives of ornamental plant breeding.
- Published
- 2021
7. High Temperature Adsorption of SO2 on Mixed Oxides Derived from CaAl Hydrotalcite-Like Compounds
- Author
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Meiping Gao, Zhengping Hao, Run Hao, Zhongshen Zhang, and Hailin Wang
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Thermogravimetric analysis ,Materials science ,Coprecipitation ,Thermal desorption spectroscopy ,Alkalinity ,high temperature adsorption ,Bioengineering ,010501 environmental sciences ,lcsh:Chemical technology ,010402 general chemistry ,01 natural sciences ,law.invention ,lcsh:Chemistry ,chemistry.chemical_compound ,Adsorption ,law ,Chemical Engineering (miscellaneous) ,lcsh:TP1-1185 ,Calcination ,hydrotalcite-like compounds ,0105 earth and related environmental sciences ,Hydrotalcite ,Process Chemistry and Technology ,0104 chemical sciences ,lcsh:QD1-999 ,chemistry ,SO2 ,CaAlO ,Derivative (chemistry) ,Nuclear chemistry - Abstract
SO2 which is usually emitted at high temperature is one of the most important air pollutants. It is of great significance to develop high temperature SO2 adsorbent with high efficiency and low cost. In this work, a series of hydrotalcite-like compound-derived CaAlO and CaXAlO(X = Ce, Co) were prepared by coprecipitation and calcination method, and were employed as adsorbents for SO2 adsorption at high temperature (700 °C). The structure and surface properties of these adsorbents were characterized by XRD, Brunauer–Emmett–Teller (BET), Derivative thermogravimetric analysis (DTG) and CO2-TPD (temperature programmed desorption) measurement. Addition of a minor amount of Ce, Co (5 wt%) could significantly increase the number of weak alkalinity sites. CaO in CaCeAlO showed the best SO2 adsorption capacity of 1.34 g/g, which is two times higher than that of CaO in CaAlO (0.58 g/g).
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- 2021
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8. Source profiles and emission factors of VOCs from solvent-based architectural coatings and their contributions to ozone and secondary organic aerosol formation in China
- Author
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Meiping Gao, Wenwen Liu, Lei Nie, Zhengchao Shen, Wei Teng, Zhenxia Du, Aijun Shi, Xiao-Shuan An, and Xuechun Sun
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China ,Environmental Engineering ,Ozone ,Health, Toxicology and Mutagenesis ,0208 environmental biotechnology ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Ethylbenzene ,Chemical reaction ,chemistry.chemical_compound ,Environmental Chemistry ,Reactivity (chemistry) ,Benzene ,0105 earth and related environmental sciences ,Aerosols ,Air Pollutants ,Volatile Organic Compounds ,Public Health, Environmental and Occupational Health ,General Medicine ,General Chemistry ,Pollution ,Toluene ,020801 environmental engineering ,Aerosol ,Solvent ,chemistry ,Environmental chemistry ,Solvents ,Environmental science ,Environmental Monitoring - Abstract
Volatile organic compounds (VOCs) from solvent-based architectural coatings (SBACs) play an important role in photochemical air pollution with increasing consumption of architectural coatings in China. In this study, we collected 148 typical SBACs of 3 types in China. The TVOC emission factors and source profiles were established, the contributions of SBACs to ozone and secondary organic aerosol (SOA) formation were investigated. The VOC emissions and O3 and SOA amounts formed in chemical reactions from SBACs in 2017 were estimated. Key organic groups and VOC species with high reactivity were identified. According to the results, the TVOC emission factors were 507.17 g L−1 for solvent-based anticorrosive coatings, 381.34 g L−1 for solvent-based floor coatings and 459.68 g L−1 for solvent-based fire-retardant coatings. The VOC emissions were 186,902.11 t, 88,225.41 t and 71,352.32 t; the O3 amounts formed were 742,001.39 t, 397,896.60 t and 244,738.46 t; the SOA amounts formed were 3934.29 t, 2488.04 t and 1104.61 t, respectively, from 3 types of SBACs in 2017. The O3 production factors were 1781.82 g O3 (kg paint)−1, 1457.50 g O3 (kg paint)−1 and 1176.63 g O3 (kg paint)−1, the SOA production factors were 9.45 g SOA (kg paint)−1, 9.11 g SOA (kg paint)−1 and 5.31 g SOA (kg paint)−1, for 3 types of SBACs. Priority should be given to organic group of aromatics and top 17 VOC species with high reactivity for O3 and SOA eliminating strategies, especially three xylenes (o-xylene, m-xylene and p-xylene), ethylbenzene, trimethyl benzenes (1,3,5-trimethyl benzene, 1,2,3-Trimethyl benzene) and toluene.
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- 2020
9. SMRT and Illumina RNA-Seq Identifies Potential Candidate Genes Related to the Double Flower Phenotype and Unveils SsAP2 as a Key Regulator of the Double-Flower Trait in Sagittaria sagittifolia
- Author
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Meiping Gao, Wen Jiang, Zhicheng Lin, Qian Lin, Qinghua Ye, Wei Wang, Qian Xie, Xinhua He, Cong Luo, and Qingxi Chen
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Sagittaria sagittifolia ,double flower ,SMRT and RNA-Seq ,WGCNA ,plant hormone ,APETALA2 ,Inorganic Chemistry ,fungi ,Organic Chemistry ,food and beverages ,General Medicine ,Physical and Theoretical Chemistry ,Molecular Biology ,Spectroscopy ,Catalysis ,Computer Science Applications - Abstract
Double flowers are one of the important objectives of ornamental plant breeding. Sagittaria sagittifolia is an aquatic herb in the Alismataceae family that is widely used as an ornamental plant in gardens. However, the reference genome has not been published, and the molecular regulatory mechanism of flower formation remains unclear. In this study, single molecule real-time (SMRT) sequencing technology combined with Illumina RNA-Seq was used to perform a more comprehensive analysis of S. sagittifolia for the first time. We obtained high-quality full-length transcripts, including 53,422 complete open reading frames, and identified 5980 transcription factors that belonged to 67 families, with many MADS-box genes involved in flower formation being obtained. The transcription factors regulated by plant hormone signals played an important role in the development of double flowers. We also identified an AP2 orthologous gene, SsAP2, with a deletion of the binding site for miR172, that overexpressed SsAP2 in S. sagittifolia and exhibited a delayed flowering time and an increased number of petals. This study is the first report of a full-length transcriptome of S. sagittifolia. These reference transcripts will be valuable resources for the analysis of gene structures and sequences, which provide a theoretical basis for the molecular regulatory mechanism governing the formation of double flowers.
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- 2022
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10. Emission factors and characteristics of volatile organic compounds (VOCs) from adhesive application in indoor decoration in China
- Author
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Lei Nie, Meiping Gao, Wen-Wen Liu, Xia Shao, Hailin Wang, Aijun Shi, Xiao-Shuan An, and Guohao Li
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chemistry.chemical_classification ,Environmental Engineering ,010504 meteorology & atmospheric sciences ,Sealant ,010501 environmental sciences ,Pulp and paper industry ,01 natural sciences ,Pollution ,chemistry ,Environmental Chemistry ,Environmental science ,Volatile organic compound ,Adhesive ,Emission inventory ,GLUE ,Waste Management and Disposal ,0105 earth and related environmental sciences - Abstract
Adhesive application in indoor decoration is an important anthropogenic volatile organic compound (VOC) emission source of both indoors and outdoors. However, few studies have been conducted on VOC emission factors and characteristics from indoor decorating adhesives. In this study, the VOC emission factors were obtained by measurement of VOCs in 210 adhesives. The results showed that the VOC emission factors were 41.23 g/L for wall and ground solidify, 33.49 g/L for tile adhesive, 76.88 g/L for white glue, 52.36 g/L for wallcovering adhesive, 132.28 g/L for sealant glue, 49.33 g/kg for foaming adhesive, 654.23 g/L for all-purpose adhesive, 251.93 g/L for free nails adhesive, 152.01 g/L for marble glue, and 136.79 g/L for beautiful sealant. Methodology for calculating activity data of decorating adhesive consumptions was developed and a VOC emission inventory from adhesive application in indoor decoration was developed using a bottom-up estimation methodology. The VOC emissions from 2012 to 2017 in China were 235,987.76, 246,230.47, 250,981.62, 249,849.48, 227,150.33 and 212, 433.07 t, respectively. The beautiful sealant, wall and ground solidify, sealant glue and all-purpose adhesive contributed the most of the total emissions, collectively accounting for 78.14%. Shandong, Jiangsu, Zhejiang, Sichuan and Guangdong ranked as the top five provinces for VOC emissions, together contributing 39.10% to the national total emissions. Shandong and Jiangsu reached up to 17,057.95 t/year and 15,207.92 t/year, respectively. Priority should be given to four types of adhesives with pretty high VOC contents for designing effective VOC control measures, including solvent-based all-purpose adhesive, solvent-based free nails adhesive, solvent-based sealant glue, and solvent-based beautiful sealant. Future emission trends are projected through 2030 based on current emission control policies and real estate trend. It may be possible to reduce VOC emissions by 60.81% and 69.37% by 2030 under the two scenarios, respectively, compared with the VOC emissions in 2017.
- Published
- 2021
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11. Rogue wave solutions of the nonlinear Schrödinger equation with variable coefficients
- Author
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Yan yan Li, Zhengde Dai, Chuanjian Wang, Meiping Gao, Changfu Liu, and Zeping Wang
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Variable coefficient ,Physics ,Series (mathematics) ,Mathematical analysis ,General Physics and Astronomy ,Schrödinger equation ,symbols.namesake ,Transformation (function) ,Quantum mechanics ,symbols ,Rogue wave ,Nonlinear Sciences::Pattern Formation and Solitons ,Nonlinear Schrödinger equation ,Variable (mathematics) - Abstract
In this paper, a unified formula of a series of rogue wave solutions for the standard (1+1)-dimensional nonlinear Schrodinger equation is obtained through exp-function method. Further, by means of an appropriate transformation and previously obtained solutions, rogue wave solutions of the variable coefficient Schrodinger equation are also obtained. Two free functions of time t and several arbitrary parameters are involved to generate a large number of wave structures.
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- 2015
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12. Physico-chemical characterization and source tracking of black carbon at a suburban site in Beijing
- Author
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Meiping Gao, Minyan Wang, Lei Nie, Hailin Wang, Zhengping Hao, and Dan Liu
- Subjects
Air Pollutants ,China ,Environmental Engineering ,Chemistry ,Analytical chemistry ,chemistry.chemical_element ,Coal combustion products ,Mineralogy ,General Medicine ,Carbon black ,Combustion ,Nitrogen ,Oxygen ,Diesel fuel ,Microscopy, Electron, Transmission ,Soot ,Volume (thermodynamics) ,Amorphous carbon ,Transmission electron microscopy ,Microscopy, Electron, Scanning ,Environmental Chemistry ,Cities ,Environmental Monitoring ,General Environmental Science - Abstract
Particles from ambient air and combustion sources including vehicle emission, coal combustion and biomass burning were collected and chemically pretreated with the purpose of obtaining isolated BC (black carbon) samples. TEM (transmission electron microscopy) results indicate that BC from combustion sources shows various patterns, and airborne BC appears spherical and about 50 nm in diameter with a homogeneous surface and turbostratic structure. The BET (Barrett-Emmett-Teller) results suggest that the surface areas of these BC particles fall in the range of 3-23 m(2)/g, with a total pore volume of 0.03-0.05 cm(3)/g and a mean pore diameter of 7-53 nm. The nitrogen adsorption-desorption isotherms are indicative of the accumulation mode and uniform pore size. O-2-TPO (temperature programmed oxidation) profiles suggest that the airborne BC oxidation could be classified as the oxidation of amorphous carbon, which falls in the range of 406-490 degrees C with peaks at 418, 423 and 475 degrees C, respectively. Generally, the BC characteristics and source analysis suggest that airborne BC most likely comes from diesel vehicle emission at this site. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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- 2015
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13. Ozonation of Acid Red 14 in the Presence of Inorganic Salts in a Microporous Tube-in-Tube Microchannel Reactor
- Author
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Lei Shao, Jian-Feng Chen, Hong Meng, Meiping Gao, Moses Arowo, Jie-Xin Wang, and Baochang Sun
- Subjects
chemistry.chemical_classification ,Inorganic salts ,Material balance ,Chemistry ,General Chemical Engineering ,Inorganic chemistry ,Oxidizing agent ,Salt (chemistry) ,Tube (fluid conveyance) ,General Chemistry ,Microporous material ,Microreactor ,Industrial and Manufacturing Engineering - Abstract
This study was conducted to investigate the effect of inorganic salts on the mass-transfer coefficient of O3 and decolorization of azo dye (Acid Red 14, AR14) solution through ozonation in a microporous tube-in-tube microchannel reactor (MTMCR). The overall volumetric mass-transfer coefficient (KGa) of O3 in the MTMCR was deduced by material balance. The effects of different salts on the KGa of O3 and decolorization efficiency of the AR14 solution were studied, and results show that both were significantly affected by the inorganic salts. Although the KGa of O3 and the decolorization efficiency of AR14 increased with increasing salt concentration and pH, the effect of NaNO3 was much weaker than that of NaCl, Na2SO4, Na2CO3, and NaHCO3. The enhanced KGa of O3 and decolorization could be due to the generation of species with high oxidizing ability in the presence of the salts.
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- 2014
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14. Enhanced removal of acid red 1 with large amounts of dyeing auxiliaries: the pivotal role of cellulose support
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Nan Li, Wenxing Chen, Meiping Gao, and Wangyang Lu
- Subjects
Cellulose fiber ,chemistry.chemical_compound ,Aqueous solution ,Materials science ,Polymers and Plastics ,chemistry ,Catalytic oxidation ,Organic chemistry ,Hydroxyl radical ,Alcohol ,Cellulose ,Dyeing ,Catalysis - Abstract
As an almost inexhaustible material with unique and outstanding properties, cellulose presents promising potential in the practical issues. In this study, the cellulose fibers-supported cobalt tetra(2,4-dichloro-1,3,5-triazine)aminophthalocyanine(denoted as Co-TDTAPc-F) catalyst and H2O2 system was introduced for removing organic dyes from aqueous solution with large amounts of dyeing auxiliaries. The model dye (acid red 1, AR1) in a relatively low concentration was removed efficiently with a hydroxyl radical (·OH)-involved mechanism. Due to the inherently excellent performance of cellulose fibers (CFs) such as the controllable surface potential and unique swelling ability in aqueous solution, the catalytic oxidation of AR1 was evidently enhanced in the presence of typical dyeing additives (NaCl and urea). Furthermore, CFs have significantly reduced the alcohol inhibition in traditional ·OH-involved reactions by forming hydrogen bonds with hydroxyl group-containing compounds, just like isopropanol. Consequently, such innately wonderful properties of cellulose carriers allowed Co-TDTAPc-F to be a promising catalyst for removing highly hazardous target pollutants in actual wastewater with large amounts of organic and inorganic compounds. The finding serves as an example of well used excellent performance of cellulose support for better reactions, further leading to a comprehensive understanding and application of cellulose.
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- 2014
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15. Ozonation of azo dye Acid Red 14 in a microporous tube-in-tube microchannel reactor: Decolorization and mechanism
- Author
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Lei Shao, Zequan Zeng, Meiping Gao, Haikui Zou, Jian-Feng Chen, and Baochang Sun
- Subjects
Environmental Engineering ,Ozone ,Health, Toxicology and Mutagenesis ,Ion chromatography ,Kinetics ,Color ,Industrial Waste ,chemistry.chemical_compound ,Mass transfer ,Environmental Chemistry ,Coloring Agents ,Chromatography ,Aqueous solution ,Public Health, Environmental and Occupational Health ,General Medicine ,General Chemistry ,Microporous material ,Hydrogen-Ion Concentration ,Pollution ,Volumetric flow rate ,chemistry ,Chemical engineering ,Microtechnology ,Environmental Pollutants ,Microreactor ,Azo Compounds ,Porosity - Abstract
The ozonation of synthetic wastewater containing azo dye Acid Red 14 (AR 14) was investigated in a high-throughput microporous tube-in-tube microchannel reactor. The effects of design and operating parameters such as micropore size, annular channel width, liquid volumetric flow rate, ozone-containing gas volumetric flow rate, initial pH of the solution and initial AR 14 concentration on decolorization efficiency and ozone utilization efficiency were studied with the aim to optimize the operation conditions. An increase of the ozone-containing gas or liquid flow rate could greatly intensify the gas–liquid mass transfer. Reducing the micropore size and the annular channel width led to a higher mass transfer rate and was beneficial to decolorization. Decolorization efficiency increased with an increasing ozone-containing gas volumetric flow rate, as well as a decreasing liquid volumetric flow rate and initial AR 14 concentration. The optimum initial pH for AR 14 ozonation was determined as 9.0. The degradation kinetics was observed to be a pseudo-first-order reaction with respect to AR 14 concentration. The difference between the decolorization and COD removal efficiency indicated that many intermediates existed in AR 14 ozonation. The formation of six organic intermediates during ozonation was detected by GC/MS, while the concentration of nitrate and sulfate ions was determined by ion chromatography. The possible degradation mechanism of AR 14 in aqueous solution was proposed.
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- 2012
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16. A unified formula of a series of breather solitons for the nonlinear Schrödinger equation
- Author
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Yan yan Li, Changfu Liu, Chuanjian Wang, and Meiping Gao
- Subjects
Series (mathematics) ,Breather ,Mathematical analysis ,Function (mathematics) ,symbols.namesake ,Nonlinear Sciences::Exactly Solvable and Integrable Systems ,Transformation (function) ,Dimension (vector space) ,symbols ,Peregrine soliton ,Soliton ,Nonlinear Sciences::Pattern Formation and Solitons ,Nonlinear Schrödinger equation ,Mathematics ,Mathematical physics - Abstract
In this paper, a unified formula of a series of breather soliton solutions for the standard (1+1) dimension nonlinear Schrodinger equation is obtained through Exp-function method. Further, by using appropriate transformation, based on solutions obtained, breather soliton solutions of the variable coefficient nonlinear Schrodinger equation are also obtained. One free function of time t and several arbitrary parameters are involved to generate abundant wave structures.
- Published
- 2015
- Full Text
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17. Effects of "3414" Fertilization Effect Test on the Yield and Economic Benefit of Sagittaria sagittifolia.
- Author
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Chi ZHANG, Meiping GAO, Zhihuan MO, Wen JIANG, Shaolong WEI, Fanglian HE, and Meixin YAN
- Published
- 2017
18. A Unified Formula of a Series of Breather Solitons for the Nonlinear Schrödinger Equation.
- Author
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Changfu Liu, Meiping Gao, Yan yan Li, and Chuanjian Wang
- Subjects
- *
SOLITONS , *NONLINEAR analysis , *SCHRODINGER equation , *PARAMETER estimation , *ROGUE waves - Abstract
In this paper, a unified formula of a series of breather soliton solutions for the standard (1+1) dimension nonlinear Schrödinger equation is obtained through Exp-function method. Further, by using appropriate transformation, based on solutions obtained, breather soliton solutions of the variable coefficient nonlinear Schrödinger equation are also obtained. One free function of time t and several arbitrary parameters are involved to generate abundant wave structures. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
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19. Flowering Habits and Seed Setting Traits under Artificial Pollination in Chinese Water Chestnut (Eleocharis dulcis).
- Author
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Kunpeng OU, Yan WANG, Fanglian HE, Wen JIANG, Meiping GAO, Lijuan CHEN, and Yuan ZENG
- Subjects
CHINESE water chestnut ,ANGIOSPERMS ,POLLINATION ,INFLORESCENCES ,STAMEN - Abstract
Copyright of Agricultural Science & Technology is the property of Hunan Academy of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2016
20. Morphogenesis of Chinese Water Chestnut Pistil and Pollen Tube during Germination.
- Author
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Kunpeng OU, Fanglian HE, Yan WANG, Wen JIANG, Meiping GAO, Zhiqiang BI, Lijuan CHEN, Weiqing DONG, and Jie GUI
- Abstract
With the forms of pistil stigma of "Guiti 2" Chinese water chestnut cnltivar during the pollination as the object of observation, we reveal the pollination process of Chinese water chestnut from the microscopic point of view, to provide reference for Chinese water chestnut crossbreeding. The results show that the Chinese water chestnut pistil has 2-4 stigmas which present white filament and vascular bundle forms, and the vessels on epidermis are thick with long translucent branched hairs; after pollination, pollen grains are tightly bound on branched hairs, and after identification, the pollen tube can penetrate branched hairs. continue to grow, and transfer the genetic material in pollen to vascular" bundle. [ABSTRACT FROM AUTHOR]
- Published
- 2016
21. Physico-chemical characterization and source tracking of black carbon at a suburban site in Beijing.
- Author
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Hailin Wang, Lei Nie, Dan Liu, Meiping Gao, Minyan Wang, and Zhengping Hao
- Subjects
- *
CARBON-black , *COAL combustion , *BIOMASS burning , *NITROGEN absorption & adsorption , *DIESEL motor exhaust gas , *AMORPHOUS carbon , *OXIDATION - Abstract
Particles from ambient air and combustion sources including vehicle emission, coal combustion and biomass burning were collected and chemically pretreated with the purpose of obtaining isolated BC (black carbon) samples. TEM (transmission electron microscopy) results indicate that BC from combustion sources shows various patterns, and airborne BC appears spherical and about 50 nm in diameter with a homogeneous surface and turbostratic structure. The BET (Barrett-Emmett-Teller) results suggest that the surface areas of these BC particles fall in the range of 3-23 m²/g, with a total pore volume of 0.03-0.05 cm³/g and a mean pore diameter of 7-53 nm. The nitrogen adsorption-desorption isotherms are indicative of the accumulation mode and uniform pore size. O2-TPO (temperature programmed oxidation) profiles suggest that the airborne BC oxidation could be classified as the oxidation of amorphous carbon, which falls in the range of 406-490°C with peaks at 418, 423 and 475°C, respectively. Generally, the BC characteristics and source analysis suggest that airborne BC most likely comes from diesel vehicle emission at this site. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
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