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Search Results: 1 - 10 of 121198 matches for " ZHANG Ben-Gang "
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Application of Poloxamer in Fat-soluble Allelochemicals Bioassay
泊洛沙姆(Poloxamer)在脂溶性化感物质生物检测中的应用

TAO Yue-Hong,ZHANG Zhao,ZHANG Ben-Gang,SI Jian-Yong,
陶月红
,张昭,张本刚,斯建勇

植物科学学报 , 2008,
Abstract: 在脂溶性化感物质的生物检测中,常规方法是使用有机溶剂对化感物质进行助溶,此法本身会对受体植物产生为害,并且不能准确定量.本研究结合药剂学理论,将动物和细胞实验中常用的增溶剂泊洛沙姆(F-68)应用于脂溶性化感物质的生物检测,用泊洛沙姆对香草醛和阿魏酸两种化感物质进行增溶,以乙醇助溶为对照,比较两种方法的化感物质活性.结果表明,化感物质用泊洛沙姆增溶后,形成的溶液是一个稳定的体系,试验过程中浓度不会发生变化,可准确定量考察化感物质的活性,同时泊洛沙姆对受体植物不产生影响.乙醇助溶处理中,或由于乙醇不易完全挥发,因乙醇的存在而对受体植物产生影响,表现为化感物质活性的加强;或随乙醇的挥发,化感物质以晶体析出,表现为化感物质活性的减弱,不能准确定量考察化感物质的活性.
Discussion of Research Methods for Fat-soluble Allelochemicals
关于脂溶性化感物质研究方法的商榷

TAO Yue-Hong,ZHANG Zhao,ZHANG Ben-Gang,SI Jian-Yong,
陶月红
,张昭,张本刚,斯建勇

植物科学学报 , 2008,
Abstract: 在有关化感物质的研究中,由于一些观念和实验方法的限制,对于脂溶性物质在自然生态环境中是否有化感作用存在争议.在化感物质的生物检测中,脂溶性成分的实验方法比较混乱,并存在很多问题,直接影响到实验的准确性和有效性,不能客观科学地进行定性及定量测定.植物的化感作用是在一个复杂的生态体系中发生的,不应主观排除脂溶性物质在自然界中的化感作用,尤其是现在化感作用机理研究越来越成为研究的热点和重点,要阐明化感作用的分子化学、酶调控和基因调节机制,迫切需要建立一个目标植物全成分化感活性筛选的基础平台,并建立定量化感活性生物检测方法.
A New Method for Vegetation Change Detection Based on Multitemporal Landsat TM Images-application in Vegetation Change Detection of Dunhuang Oasis
一种利用多时相TM影像分析地表植被变化的新方法——以敦煌地区绿洲植被变化分析为例

LI Ben-gang,TAO Shu,
李本纲
,陶澍

遥感学报 , 2000,
Abstract: Land cover change detection is an important applica ti on field of remotely sensed data In this paper, a new method for vegetation chan ge detection based on multitemporal Landsat TM images is introduced. Results of its application in vegetation change detection of Dunhuang Qasis show positive a spects of this method Color composition of multitemporal TM data gives an obviou s view of vegetation change in the stady area. Color components from color space transformation can be used for quantitative analysis of vegetation change. Hue and Saturation components indicate types and intensity of changes respectively. Lightness component shows general NDVI distribution over the study period. This new method can be easily applied to other change study fields.
Heuristic algorithm for consolidation problem of air cargo forwarders
一种求解航空货代拼箱问题的启发式算法*

GUI Yun-miao,GONG Ben-gang,CHENG You-ming,
桂云苗
,龚本刚,程幼明

计算机应用研究 , 2011,
Abstract: In order to solve realistically large-scale cargo consolidation problems,this paper transformed the air cargo forwarders consolidation problem to well-known set covering problem based on mixed integer programming model and used Lagrangian Relaxation to develop a recursive heuristic algorithm,and discussed the problems of feasible solution determination and set adjustment.Tested a numerical experiment.The results show that the algorithm is feasible with high computing efficiency,and the generated solutions i...
Quantitative assessment of hepatic fibrosis by contrast-enhanced ultrasonography with different regions of interest
肝纤维化超声造影定量分析中不同形状及不同部位感兴趣区的差异性研究

LI Na,DING Hong,WANG Ben-gang,LIN Xi-yuan,FAN Pei-li,WANG Wen-ping,
李娜
,丁红,王本刚,林希元,范培丽,王文平

中华医学超声杂志(电子版) , 2009,
Abstract: 目的 探讨超声造影定量分析中选择不同形状及不同部位感兴趣区测定肝纤维化定量参数有无差异性.方法 对30例血清乙型肝炎病毒标志物检测阳性的患者穿刺前行超声造影检查,采集动态造影数据,使用超声造影定量分析软件进行脱机分析.选择同一断面的边缘肝实质、中心肝实质、门静脉主干和肝右静脉分别以椭圆、矩形及不现则形感兴趣区经拟合获得相应的时间-强度曲线(TIC),得到定量参数:强度增量(ISI)、峰值减半斜率(a2)、上升斜率(a3)、平始显影时间(AT)、达峰时间(TTP)、峰值强度(PI)、曲线下面积(AUC)和平均通过时间(MTT).比较不同形状感兴趣区及边缘与中心肝实质各项定量参数有无差异.结果 不同形状感兴趣区的各项参数ISI、a2、a3、AT、TTPPI、AUC和MTT测值比较差异均无统计学意义(P>0.05);边缘肝实质与中心肝实质各项参数中,ISI、a2、AT、PI和AUC测值比较差异有统计学意义(P<0.05).结论 肝纤维化超声造影定量分析中绘制不同形状感兴趣区对分析结果无影响;边缘肝实质与中心肝实质的微循环灌注不同.
Source Apportionment of Polycyclic Aromatic Hydrocarbons in the Topsoil of Tianjin
天津表层土壤中多环芳烃的主要来源

DUAN Yong-hong,TAO Shu,WANG Xue-jun,LI Ben-gang,ZHU Li-zhong,LUO Yong-ming,
段永红
,陶澍,王学军,李本纲,朱利中,骆永明

环境科学 , 2006,
Abstract: The sources of PAHs in the topsoil were apportioned using principal component analysis with multiple linear regression.Three sub-regions with significant differences in PAH levels and profiles were investigated individually.The results indicated that coal combustion and coking production were the dominate PAH source for the entire Tianjin,particularly for Tanggu-Hangu region with the highest PAH level,to which 79% of PAHs came from coal combustion and coking industry and 21% was from vehicles.For the city center and outskirts,vehicles and coal burning contributed 35% each,while incineration provided 21% of the total. Sources of PAHs in rural soil with relatively low level of PAHs were more diverse.In addition to coal,vehicles,and coking,straw burning added 11% to the total.The results based on the source apportionment were compared with those from emission modeling.
Frequency distributions of anthracene and pyrene in the topsoil of Tianjin
天津地区表土中蒽和芘的频率分布特征

DUAN Yong-hong,LI Ben-gang,TAO Shu,WANG Xue-jun,XU Fu-liu,CAO Jun,LIU Wen-xin,
段永红
,李本纲,陶澍,王学军,徐福留,曹军,刘文新

地理研究 , 2005,
Abstract: Frequency distributions of contaminants in special medium can reflect from one profile its macroscopic statistic characteristics, and can also supply necessary basic information for the classical, multivariate and spacial statistic analysis, so as to ensure basic needs to all kinds of methods for statistic analytical data.So for special studies on statistic distribution characteristics of PAH content with large numbers of specimen in a vast region have been rarely seen. Characteristics of frequency distributions of anthracene and pyrene in the topsoil of Tianjin, China, which was polluted seriously by PAHs, were studied based on frequency analysis, K-Means clustering and least-square fitting. It was demonstrated that both anthracene and pyrene, especially the former, are bimodally distributed. Double gaussian function can be used to fit the empirical distribution well after log-transformation, suggesting the presence of two independent lognormally distributed populations for either anthracene or pyrene. The geometric means of the two populations were 2.73±2.17 ng/g and 26.52±1.55ng/g for anthracene and 11.05±2.11ng/g and 82.52±3.24ng/g for pyrene. Hereby, the research which adopts two-division-methods and three-division-methods indicates: that the spatial separation of the two pyrene populations is explicitely illustrated by symbol mapping, showing that the indiviudals of the high value population clustered in urban, near-suburb, and newly developed industrial areas.For anthracene, there is a tendency of local clustering. Besides, the similarity between the spatial distribution patterns of pyrene and pyrene/benzo\pyrene ratio suggests that the dual-modal distribution of pyrene was emission-source related. Fitting and separating methods of multi-modal distributions mentioned above provided methodological grounds for deep probing into their differences and origins of the distributive characteristics of different PAHs.
Population Exposure to HCH in Tianjin Area
天津地区人群对六六六的暴露分析

GUO Miao,TAO Shu,YANG Yu,LI Ben-gang,CAO Jun,WANG Xue-jun,LIU Wen-xin,XU Fu-liu,WU Yong-ning,
郭淼
,陶澍,杨宇,李本纲,曹军,王学军,刘文新,徐福留,吴永宁

环境科学 , 2005,
Abstract: The population exposure to HCH in Tianjin area is estimated based on field data on media concentration and other data from the literature. A multimedia /multipathway human exposure model is employed to calculate the population' s Chronic Daily Intake (CDI) of HCH. The population's lifetime CDI was 0.05microg x (kg x d)-1, and the daily exposures of child, youth and adult were 0.10, 0.06, and 0.04microg x (kg x d)-1, respectively. The result indicates that diet exposure was the most important route, accounting for 87% of total dose. Respiration ranked second and contributed 5% - 10% of the total dose.
trans-Diaquabis[5-carboxy-2-(3-pyridyl)-1H-imidazole-4-carboxylato-κ2N3,O4]iron(II)
Wei Liu,Gang Zhang,Xia Li,Ben-Lai Wu
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809027457
Abstract: In the title complex, [Fe(C10H6N3O4)2(H2O)2], the FeII atom is located on an inversion centre and is trans-coordinated by two N,O-bidentate 5-carboxy-2-(3-pyridyl)-1H-imidazole-4-carboxylate ligands and two water molecules, defining a distorted octahedral environment. A two-dimensional network of N—H...O and O—H...O hydrogen bonds extending parallel to (110) helps to stabilize the crystal packing.
Crowds on Wall Street: Extracting Value from Social Investing Platforms
Gang Wang,Tianyi Wang,Bolun Wang,Divya Sambasivan,Zengbin Zhang,Haitao Zheng,Ben Y. Zhao
Computer Science , 2014,
Abstract: For decades, the world of financial advisors has been dominated by large investment banks such as Goldman Sachs. In recent years, user-contributed investment services such as SeekingAlpha and StockTwits have grown to millions of users. In this paper, we seek to understand the quality and impact of content on social investment platforms, by empirically analyzing complete datasets of SeekingAlpha articles (9 years) and StockTwits messages (4 years). We develop sentiment analysis tools and correlate contributed content to the historical performance of relevant stocks. While SeekingAlpha articles and StockTwits messages provide minimal correlation to stock performance in aggregate, a subset of authors contribute more valuable (predictive) content. We show that these authors can be identified via both empirical methods or by user interactions, and investments using their analysis significantly outperform broader markets. Finally, we conduct a user survey that sheds light on users views of SeekingAlpha content and stock manipulation.
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