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Search Results: 1 - 10 of 120499 matches for " ZHANG Fa-Sheng "
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Research on high-voltage 4H-SiC P-i-N diode with planar edge junction termination techniques

Zhang Fa-Sheng,Li Xin-Ran,

中国物理 B , 2011,
Abstract: The planar edge termination techniques of junction termination extension (JTE) and offset field plates and field-limiting rings for the 4H-SiC P-i-N diode were investigated and optimized by using a two-dimensional device simulator ISE-TCAD10.0. By experimental verification, a good consistency between simulation and experiment can be observed. The results show that the reverse breakdown voltage for the 4H-SiC P-i-N diode with optimized JTE edge termination can accomplish near ideal breakdown voltage and much lower leakage current. The breakdown voltage can be near 1650 V, which achieves more than 90 percent of ideal parallel plane junction breakdown voltage and the leakage current density can be near 3×10-5 A/cm2.
Natural taurine promotes apoptosis of human hepatic stellate cells in proteomics analysis
Xin Deng, Jian Liang, Zhi-Xiu Lin, Fa-Sheng Wu, Ya-Ping Zhang, Zhi-Wei Zhang
World Journal of Gastroenterology , 2010,
Abstract: AIM: To study the differential expression of proteins between natural taurine treated hepatic stellate cells and controls, and investigate the underlying regulatory mechanism of natural taurine in inhibiting hepatic fibrosis.METHODS: A proteomic strategy combining two-dimensional gel electrophoresis and ultra-performance liquid chromatography-electrospray ionization-tandem mass spectrometry (UPLC-ESI-MS/MS) was used to study the differential expression of proteins and Western blotting was used to validate the results. Gene ontology (GO) method was utilized to analyze the functional enrichment of differentially expressed proteins. Flow cytometry was performed to compare the apoptosis rate between taurine-treated and untreated hepatic stellate cells (HSCs).RESULTS: Nineteen differentially expressed proteins (11 up-regulated and 8 down-regulated) were identified by 2D/MS, and the expression profiles of GLO1 and ANXA1 were validated by Western blotting. GO analysis found that these differentially expressed proteins were enriched within biological processes such as “cellular apoptosis”, “oxidation reaction” and “metabolic process” in clusters. Flow cytometric analysis showed that taurine-treated HSCs had a significantly increased apoptosis rate when compared with the control group.CONCLUSION: Natural taurine can promote HSC apoptosis so as to inhibit hepatic fibrosis.
Bird Diversity and Seasonality in Urban Parks of Guangzhou

LI Hui,HONG Yong-mi,ZOU Fa-sheng,ZHANG Qiang,HUANG Jun-hui,

动物学研究 , 2008,
Abstract: 1999年1月—2000年4月和2006年7月—2007年6月,用路线法对广州市中心城区5个公园的鸟类组成及多样性进行了调查,共记录到鸟类64种。暗绿绣眼鸟(Zosterops japonica)、白头鹎(Pycnonotus sinensis)和夜鹭(Nycticorax nyctinorax)是优势种。留鸟、冬候鸟和夏候鸟分别占鸟类种数的64.1%、26.6%和7.8%。以9月份记录到的鸟种最多(31种)、7月份和11月份记录到的鸟种最少(均为20种)。公园鸟类的平均遇见率为(65±5)ind./h],3月份鸟的遇见率最高(98±29)ind./h],1月份鸟的遇见率最低(35±11)ind./h],但各月鸟类的遇见率无显著性差异(F3,56=1.35,P=0.226)。在4、9和12月,迁徙鸟种类最多,迁徙鸟遇见率季节变化明显(F11,48=3.098,P=0.003)。各公园鸟类的丰度不同,鸟种数与公园总面积显著相关(R=0.905,P=0.035;S=11.02A0.28,S:鸟类种数,A:公园总面积),即鸟种的数量随公园面积的增大而增加。从鸟类多样性保护和城市用地的角度考虑,广州市公园面积在65hm2左右较佳。
Polymorphism in the Hypoxia-Inducible Factor 1alpha Gene May Confer Susceptibility to LDD in Chinese Cohort
Wen-Ping Lin, Xue-Jin Wang, Cong-Ren Wang, Li-Qun Zhang, Neng Li, Fa-Sheng Wang, Jian-Hua Lin
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0073158
Abstract: Objective This study aimed to investigate whether or not hypoxia-inducible factor-1α (HIF-1α) gene variants are associated with the susceptibility and clinical characteristics of lumbar disc degeneration (LDD). Methods We examined 320 patients with LDD and 447 gender- and age-matched control subjects. We also determined the HIF-1α gene variants, including C1772T (P582S) and G1790A (A588T) polymorphisms. Results Significant differences were observed in allelic and genotypic distributions of 1790 A > G polymorphisms between LDD cases and control subjects. Logistic regression revealed that 1790 AA genotypes indicated a protective effect against the development of LDD. The HIF-1α 1790 A > G polymorphisms also affected the severity of LDD as evaluated based on the modified Japanese Orthopedic Association (mJOA) scores. The 1790 AA genotype carriers exhibited significantly lower mJOA scores than AG and GG carriers. C1772T did not show any association with the risk and severity of LDD. Conclusion Our study suggested that HIF-1α 1790 A > G polymorphisms may be used as a molecular marker to determine the susceptibility and severity of LDD.
A study of understory bird communities in tropical mountain rain forest of Jianfengling, Hainan Island, China

ZOU Fa-Sheng,

生态学报 , 2004,
Abstract: Understory birds were sampled by mist-nets in tropical mountain rain forest (including secondary and primary) of Jianfengling, Hainan Island from May 2000 to March 2002. A total of 312 individuals of 40 species representing 11 families, and 6 orders were captured. The species and captures of Passeriformes less than 25 g in mass constituted the largest component of understory birds, accounting for 30.0% of total species and 50.32% of total captures respectively. However biomass of these species was less than the biomass of species of 25~50g weight or more than 100g weight. Many species of non-passeriformes often visited the understory strata, with the heaviest individual being 370 g. Understory birds belonged to various taxonomical species. Understory insectivorous birds formed the most dominant group with 70.0% of all species and 77.56% of all captures in tropical mountain rain forests of Jianfengling. Though understory frugivorous birds formed the second richness group, it consisted of species of Pycnonotidae and Columbidae and accounted for a small part of the community (10.0% of species and 10.90% of captures). This paucity of frugivorous species contrasts with the rain forests of America and Africa where frugivorous birds are abundant. Grey-Cheeked Fulvetta (Alcippe morrisonia) was the most dominant insectivorous species of understory communities, accounting for 37.88%, and 29.44% of all captures in primary and secondary forests respectively. The White-throated Bulbul (Alophoixus pallidus) was the most dominant frugivorous species in both primary and secondary forests. The density of understory birds fluctuated seasonly. There was greater density in dry seasons than in rainy seasons in primary forest, but almost the same density between dry seasons and rainy seasons in the secondary forest. The composition of understory birds varied seasonly with only a few species being captured across seasons in both primary and secondary forests. Resident birds constituted more than 85% of all species and 90% of all captures in communities. Only 5 species were migratory birds (wintering in Hainan Island):Rufous-tailed Robin (Luscinia sibilans), Red-flanked Bush Robin (Tarsiger cyanurus), Scaly Thrush (Zoothera dauma), Grey Thrush (Turdus cardis) and Fukien Niltava (Niltava davidi). The number of migratory birds accounted for 7.37% of all captures and had an insignificant effect on seasonal changes of bird densities of understory birds. The results showed a similar mean capture rate of birds in between primary and secondary forests, but composition of species were different and Jaccard's similarity index was only 0.35.
Patterns of PAHs Components and Levels in Surface Soils of Main Areas in China

Li Fa-Sheng,

环境科学学报 , 2011,
Abstract: 关于我国表层土壤多环芳烃的含量、组成及来源分析的报道很多,但大部分都是针对某一地点或地区的研究,关于我国主要地区总体分布情况的研究很少。为全面了解我国表层土壤中多环芳烃组成及含量特征,本文基于文献报道结果,较系统地分析了全国土壤多环芳烃的总体污染状况及规律。对140组数据进行分析的结果表明:我国表层土壤∑PAHs的含量中位值为580 μg/kg。从PAHs的组成来看,4~6环PAHs的相对比例较高,占68.53%。我国表层土壤中∑PAHs平均含量的分布趋势为东北>华北>华中>华南,东北地区表层土壤中∑PAHs的含量显著高于其他三个地区(P<0.05),其它三个地区间无显著差异。东北地区土壤中∑PAHs的含量约是华南地区的5倍。造成这种差异的原因可能和气候条件的地理性差异以及产业结构的区域性分布有关。不同的污染源类型对土壤中PAHs的含量影响很大,点源污染表层土壤多环芳烃的含量显著高于面源污染的土壤(P<0.01),面源与点源污染表层土壤中∑PAHs的平均含量分别为317.3 μg/kg和1812.95 μg/kg。上述研究结果可为全国和区域土壤环境质量评价以及土壤环境质量标准制修订提供参考。
Adsorption performance of CMC polymer for heavy metal ions

LIU Zuo-Xin,QU Wei,MIAO Yong-Gang,WANG Zhen-Ying,YIN Guang-Hua,ZHANG Fa-Sheng,

中国科学院研究生院学报 , 2009,
Abstract: 通过正交试验得出制备羧甲基纤维素(CMC)聚合物的最佳工艺条件:丙烯酸(AA)/羧甲基纤维素=10,引发剂(硫酸铵)和交联剂(N,N′-亚甲基双丙烯酰胺)用量分别为单体的0.0014倍和0.0015倍.吸胀平衡后,将CMC聚合物在400~450℃下完全灰化16h,消解并用火焰原子吸收法测定聚合物对Zn2+、Cu2+、Pb2+、Cd2+、Cr2+、Ni2+和Mn2+的吸附性能.结果表明,CMC聚合物对重金属离子具有一定的吸附能力,其吸附量随着溶液pH值和重金属离子质量浓度的增加而增大,当pH为9时达到最大;并且CMC聚合物对Pb2+和Cu2+的吸附量要大于其他金属离子.
Occurrence of Dissolved Polychlorinated Biphenyls and Organic Chlorinated Pesticides in the Surface Water of Haihe River and Bohai Bay, China

WANG Tai,ZHANG Zu-lin,HUANG Jun,HU Hong-ying,YU Gang,LI Fa-sheng,

环境科学 , 2007,
Abstract: Polychlorinated biphenyls (PCBs), hexachlorocyclohexanes (HCHs) and dichlorodiphenyl-trichloroethanes (DDTs) were analyzed in the surface water of Haihe River and Bohai Bay, in north of China. Concentrations of PCBs, HCHs and DDTs were 0.31 - 3.11 microg/L, 0.30 -1.07 microg/L and 0.02 - 0.15 microg/L in river, and in sea were 0.06 - 0.70 microg/L, 0.05 - 0.75 microg/L and 0.01 - 0.11 microg/L respectively. Mostly, the PCBs, HCHs and DDTs in the Bohai Bay are from terrestrial input by Haihe River. PCBs and organic chlorinated pesticides (OCPs) are positively correlated with DOC (dissolved organic carbon). The levels of PCBs and OCPs in Haihe River in this study are quite higher than the similar surface waters in China, while the levels in Bohai Bay are quite consistent with similar waters abroad.
Research on the Characteristic of Toluene Migration and Distribution in Fluvo-Aquic Soil and Its Simulation Using STOMP Model

HAN Chun-mei,RAN Juan,ZHANG Hui,LI Fa-sheng,LI Yan,GU Qing-bao,

环境科学 , 2012,
Abstract: Frequently accidental spill of hazard materials into soil environment posed significant threats to human health and natural environment in China. In this paper, simulated nonaqueous phase liquid (NAPLs) toluene sudden spill in fluvo-aquic soil was performed in a two-dimensional tank to investigate the migration and distribution characteristics of toluene as well as its simulation through STOMP model. Visual observation showed that the horizontal expansion of toluene with concentration>1 g·kg-1 and>20 g·kg-1 were approximate 2.3 and 3 times the length of the corresponding vertical transportation, respectively. The result revealed that toluene exerted a preferential tendency to lateral spread compared to the vertical migration trends, which may contribute to the impeding effect as a result of the low permeable capacity of soil (permeability coefficient was 0.12 cm·h-1). The behavior and fate of toluene in heterogeneous soil layers (combined fluvo-aquic-sand and sand-fluvo-aquic soil layers, respectively) after spill were simulated using STOMP model and the results indicated that the significant difference in relative permeability of interface layer, due to the much higher value of permeability coefficient of sand (29.70 cm·h-1) than that of fluvo-aquic soil, played an important role on the redistribution of toluene after its spill into the heterogeneous soil layers. For practical purposes, the results of this study may be beneficial to identify the distribution property of NAPLs in time after its release into the soil environment.
Seed dispersal of the pioneer shrub Rhodomyrtus tomentosa by frugivorous birds and ants

WEI Ming-Si,CHEN Zhang-He,REN Hai,ZOU Fa-Sheng,YIN Zuo-Yun,College of Life Science,South China Normal University,Guangzhou South China Botanical Garden,Chinese Academy of Sciences,Guangzhou South China Institute of Endangered Animals,Guangzhou Guangdong Research Institute of Forestry,Guangzhou,

生物多样性 , 2004,
Abstract: 在中国科学院鹤山丘陵综合开放试验站观察研究了鸟类和蚂蚁对桃金娘 (Rhodomyrtustomentosa)种子的传播。据野外观察和网捕法所捕鸟的情况可知 :红耳鹎 (Pycnonotusjocosus)和白头鹎 (P .sinensis)两种鸟传播桃金娘种子 ,白头鹎比红耳鹎的数量多。在网捕到的红耳鹎和白头鹎的粪便中收集到的桃金娘种子分别为 8.0± 3.0粒/只和 10 .0± 2 .0粒 /只。在显微镜下观察经过鸟消化道的桃金娘种子都没有破损。传播桃金娘种子的蚂蚁有全异巨首蚁 (Pheidologetiondiversus)和梅花山大头蚁 (Pheidolemeihuashanensis)。它们传播的最远距离分别为 4m和 5m ,平均为 1.1± 0 .0 9m和 1.3± 0 .0 7m。全异巨首蚁占样地蚂蚁个体总数的 6 0 .0 % ;梅花山大头蚁占个体总数的8.1% ;余下的为其他种蚂蚁。每个全异巨首蚁蚁巢平均贮藏桃金娘种子 195 .0± 82 .9粒 ,其中 73.2 %是完好种子。每个梅花山大头蚁蚁巢平均贮藏 2 8.8± 11.4粒种子 ,全部是完好种子。林窗、闲置的空旷地、植物群落交错带都有桃金娘实生苗。在阳光充足的全异巨首蚁和梅花山大头蚁蚁巢边也有桃金娘实生苗的存在
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