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Search Results: 1 - 10 of 116342 matches for " FENG Zhao-Yang "
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2-(2-Chloropyrimidin-4-yl)-3,5,6,7,8,9-hexahydro-2H-1,2,4-triazolo[4,3-a]azepin-3-one
Gong-Chun Li,Li-Ye Wang,Zhao-Yang Li,Feng-Ling Yang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808028900
Abstract: In the title compound, C11H12ClN5O, the triazolone and pyrimidine rings are almost coplanar [dihedral angle = 2.98 (14)°]. The total puckering amplitude QT of the seven-membered lactam ring is 0.706 (3) .
A CYTOGEOGRAPHICAL STUDY ON CLINTONIAUDENSIS (LILIACEAE)
七筋姑的细胞地理学研究

Li Si-feng Chang Zhao-yang,
李思锋
,常朝阳

植物分类学报 , 1996,
Abstract: 根据本文对中国境内(从西藏聂拉木—吉林长白山)七筋姑10个居群的核型及细胞地理学和形态学分化的研究结果及前人的资料指出,东亚的七筋姑具有两种倍性,2n=14的二倍体和2n=28的四倍体。二倍体分布于云南~俄罗斯远东滨海边区,核型相当一致:K(2n)=2V+6J+2V+4j(2NOR+2j), 2A(→2B)。四倍体除出现在东亚(或二倍体分布区)的两端——云南及其以西的喜马拉雅地区和日本外,目前仅在陕西南部化龙山北坡中山一带较狭的范围内发现。在东亚两端四倍体的核型为K(2n)=4V+12J+4v+8j(2NOR十6j),2A(→2B),且相当一致;在中部为K(2n)=4V+12J(2NOR+10J)+4v+8jK(2n)=10m+16sm(2SAT)+2st],2A,二者核型具有相似性但有一定的差异。北美4种全部为2n=28,且核型一致。因此,七筋姑属的染色体基数x=7而非14。该属核型的原始类型在东亚,北美是该属的次生分化中心和现代分布中心。在东亚类群中,除种子随多倍化而增大,种子的颜色与地理分布有关外,很难从其它形态特征上作进一步区分。因此,主要以叶子大小、花序类型和花的数目,果实、种子的大小和颜色等特征作为(Clintonia alpina或C.udensis var.alpina的分类依据是不充分的。
A Cytogeographical Study on Clintonia udensis (Liliaceae)
七筋姑的细胞地理学研究

Li Si-feng,Chang Zhao-yang,
李思锋
,常朝阳

中国科学院研究生院学报 , 1996,
Abstract:
3-Chloro-4-dimethylamino-5-[(1R,2S,5R)-2-isopropyl-5-methylcyclohexyloxy]furan-2(5H)-one
Xiu-Mei Song,Ning Wang,Zhao-Yang Wang,Zong-Cai Feng
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811015583
Abstract: The title compound, C16H26ClNO3 contains one almost planar furanone ring [maximum deviation of 0.021 (2) for the O atom] with a stereogenic center (S) and one cyclohexane ring which displays a chair conformation and has three stereogenic centers [S at the C atom bearing the isopropyl group, R at the C atom attached to the O atom and R at the C atom bearing the methyl group].
Evolution of Hydrate Dissociation by Warm Brine Stimulation Combined Depressurization in the South China Sea
Jing-Chun Feng,Gang Li,Xiao-Sen Li,Bo Li,Zhao-Yang Chen
Energies , 2013, DOI: 10.3390/en6105402
Abstract: To evaluate the gas production performance of the hydrate accumulations in the South China Sea, a numerical simulation with warm brine stimulation combined depressurization has been conducted. A dual horizontal well system is considered as the well configuration in this work. In order to reduce energy input and improve energy utilization, warm brine (<30 °C) instead of hot brine (>50 °C) is injected into the reservoir for hydrate dissociation. The effect of the intrinsic permeability of the hydrate reservoir, the salinity and the temperature of the injected brine to gas hydrate exploitation have been investigated. The numerical simulation results indicate that the average gas production rate Q avg is about 1.23 ′ 10 5 ST m 3/day for the entire hydrate deposit, which has the same order of magnitude compared with the commercially viable production rate. The injected brine can be pumped out from the upper production well directly after the hydrate between the two wells is dissociated completely. Thus, the effective region of heat and inhibitor stimulation is limited. The sensitivity analyses indicate that the dissociation rate of hydrate can be enhanced by increasing the temperature of the injected brine and raising the salinity of the injected brine. The parametric study of permeability shows that the hydrate of the reservoir with the larger permeability has a higher dissociation rate.
Congenital meningomyelocele complicated by incontinence of urine following the burn of the four limbs : A report of one case
DONG Zhao-Yang
Zhong Xi Yi Jie He Xue Bao , 2003,
Abstract:
Compressed Domain Moving Object Detection Based Entropy Model
基于熵模型的压缩域运动对象检测

XU Jian-feng,LIU Zhi,ZHANG Zhao-yang,
徐剑峰
,刘志,张兆杨

中国图象图形学报 , 2007,
Abstract: With the development of video encoder and decoder technology,H.264 has become one of the most important standards.In this paper,we proposed novel moving object detection based on spatial-temporal method in compressed domain,which mainly depended on the motion vector field and efficiently segmented the object.Firstly,a spatially median filter was applied to the motion vector to alleviate the error vector due to difference between the motion vector obtained from motion estimation and the real motion information.Secondly,we built the spatial and temporal coherence model with the entropy based method.We obtain the threshold with these models.The effectiveness of our method was demonstrated with its performance on experiment results.
CD98 Positive Eosinophils Contribute to T Helper 1 Pattern Inflammation
Fu-Min Xue, Huan-Ping Zhang, Hui-Jie Hao, Zhao-Yang Shi, Chuan Zhou, Baisui Feng, Ping-Chang Yang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0051830
Abstract: Background and Aims The pathogenesis of inflammatory bowel disease (IBD) has not been fully understood yet. Eosinophils (Eo) are one type of the major proinflammatory cells of the chronic inflammation in the intestine. CD98 is involved in the pathogenesis of a number of inflammations. This study aims to elucidate the role of CD98+ Eos in the initiation of intestinal inflammation. Methods The colon biopsies were collected from 60 patients with IBD. The expression of CD98 in the biopsies was examined by immunohistochemistry. The serum levels of the flagellin (FGN) antibody and Eo-derived mediators in the culture supernatants were assessed by enzyme-linked immunosorbent assay. The role of FGN on Eo activation was examined in a cell culture model. The role of FGN in the induction of colitis was observed in a mouse model. Results Compared to normal controls, the frequency of CD98+ Eos was markedly increased in the IBD colon mucosa. FGN were detected in the colon biopsies and in the sera of IBD patients. Exposure to FGN induced the expression of galectin 3 (the ligand of CD98) in dendritic cells. The exposure to galectin 3 activated the CD98+ Eos. After treatment with FGN intrarectally, mice with eosinophilia showed severe inflammation in the colon. Conclusions The interaction of galectin 3 and CD98 can induce Eos to release chemical mediators that contributes to the initiation of the intestinal inflammation.
Molecular dynamics simulation of CO2 separation from integrated gasification combined cycle syngas via the hydrate formation
整体煤气化联合循环合成气水合物法分离CO2的分子动力学模拟

Yan Ke-Feng,Li Xiao-Sen,Chen Zhao-Yang,Xu Chun-Gang,
颜克凤
,李小森,陈朝阳,徐纯钢

物理学报 , 2010,
Abstract: 利用分子动力学(MD)模拟方法研究整体煤气化联合循环(IGCC)合成气(CO2/H2)水合物法分离CO2的分离机理,系统研究了CO2水合物、H2水合物以及合成气水合物法一级分离所得CO2/H2混合气体水合物的微观结构及性质.模拟分析n个CO2或H2与水合物笼状结构的整体结合能ΔE
Changes in plant functional groups and species diversity under three grassland using modes in typical grassland area of Inner Mongolia, China
内蒙古典型草原区3种不同草地利用模式下植物功能群及其多样性的变化

MA Jian-Jun,YAO Hong,FENG Zhao-Yang,ZHANG Shu-Li,
马建军
,姚虹,冯朝阳,张树礼

植物生态学报 , 2012,
Abstract: Aims Our objectives were to reveal changes in plant functional groups and species diversity under three grassland using modes in typical steppe of Inner Mongolia, China. Methods Three plots in similar habitats were selected from the Hulunbeier steppe area of the Hui River National Nature Reserve: an meadow plot (controlled utilization), pasture plot (moderate utilization) and public pasture plot (severe utilization). Plots were 250 m × 250 m and consisted of three sample belts separated by 20 m. Each sample belt had eight 1 m × 1 m sample plots. Important findings There were differences in species composition and community characteristics of the functional groups. Shrubs and sub-shrubs combined were significantly different (p < 0.05) among the plots, with the highest value in meadow. Perennial grasses were significantly different (p < 0.05). Annual and biennial herbs combined had significant differences (p < 0.05), with the highest value in the public pasture. The public pasture also had the highest percentage of the xerophyte functional group (50%) and the lowest mesoxerophyte and mesophyte (19%), and differences were significant (p < 0.05) among the plots. The biomass of shrubs and sub-shrubs were lower in all plots. The combined biomass of perennial grasses and forbs decreased with the increase in grassland use intensity among meadow, pasture and public pasture, while the combined biomass of annual and biennial herbs increased. With the increase in use intensity, the community structure and composition tended to become simplified and susceptible to change. Richness and diversity were lowest in the pasture and highest in meadow. Differences in evenness were not significant. The use of meadow contributed to improving the health of the grassland, but pasture and public pasture exhibited over-grazing phenomena. The public pasture had degraded significantly because of the uncertainty about property responsibility and ineffective management.
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