伴行血管在高强度聚焦超声下对温度场的影响

在高强度聚焦超声(HIFU)下，研究了管径不同的伴行血管对于组织温度分布的影响．基于3个热平衡方程提出了1个生物热传导模型，针对带有直径为50～300μm成对血管的组织，利用有限元方法进行了3-D温度瞬态仿真，并对血管直径、血液流速和血液灌流率对3-D温度分布的影响进行了比较．结果表明，血管直径和血流速度是影响HIFU作用下组织温度分布的决定因素，此外，该模型可以给出较为准确的组织消融量．     

基于时序依赖表达的工作流过程模型

时间管理是日益复杂的业务处理环境对工作流管理系统提出的新的要求。本文在对丁作流过程控制结构描述的基础上，定义了活动的时序依赖图，并在全面描述活动各种属性的同时分析活动时序依赖的内在决定因素。从而建立了一种以时序依赖的定义为核心的完整的过程模型。     

In situ hyperspectral data analysis for pigment content estimation of rice leaves

Analyses of the correlation between hyperspectral reflectance and pigment content including chlorephyll-a, chlorephyll-b and carotenoid of leaves in different sites of rice were reported in this paper. The hyperspectral reflectance of late rice during the whole growing season was measured using a Spectroradiometer with spectral range of 350 - 1050 nm and resolution of 3 nm. The chlorophyll-a, chlorephyll-b and carotenoid contents in rice leaves in rice fields to which different levels of nitrogen were applied were measured. The chlorephyll-a content of upper leaves was well correlated with the spectral variables. However, the correlation between both chlorephyll-b and careteniod and the spectral variables was far from that of chlorophyll-a. The potential of hyperspectral reflectance measurement for estimating chlorophyll-a of upper leaves was evaluated using univariate correlation and multivariate regression analysis methods with different types of predictors. This study showed that the most suitable estimated model of chlorephyll-a of upper leaves was obtained by using some hyperspectral variables such as SDr , SDb and their integration.     

镓的高灵敏显色反应(Ga(Ⅲ)-BPR-Tween80-CTAB体系)

本文研究了高灵敏的Ga(Ⅲ)-BPR-Tween80-CTAB体系。该体系的适宜酸度为pH2.87～3.42。最大吸收在528nm。锌量在0.1～1.0μg/25ml范围遵守比耳定律。当Tween80在高浓度(0.8％)时,ε=5.72×10~5l·mol~(-1)·cm~(-1);当Twnne80在低浓度(0.24％)并辅以少量H_2O_2(浓度为4.8×10~(-3)％)时,ε=1.09×10~6l·mol~(-1)·cm~(-1)。镓在6mol/l盐酸介质中用乙酸丁酯萃取分离后,测定了分子筛型催化剂中的镓含量。     

黄河水体对苯酚吸附作用的研究

研究了黄河沉积物对苯酚的吸附作用 ,吸附等温线符合Freundlich方程 ,即Cs=0 .186 5×C0 .5191eq .结果表明 ,黄河水中有微量苯酚存在时 ,绝大部分吸着于河流沉积物上 .     

大学生群体心理试析

通过对大学生群体的分类，探讨了群体成因及各群体内成员个体意识与群体意识的关系，并对大学生教育模式提出展望。     

本能与生物进化

较为详细地论述了达尔文主义及非达尔文主义对本能与进化之间的关系问题的分析，对本能能否遗传的问题进行了初步探讨。     

Effect of Caffeic acid on the Tumor Cells U937 Evaluated by an Electrochemical Voltammetric Method

Catl'eicacidisoneofthemajorpolyphenolcompoundsfoundinnumerousplantspecies.t'llbicbcallbeaccumulatedto29/Oinhumandailydieti.Itiswidelyrecognizedtobedlllioxidallt.whichcallscavengereactivespeciesofoxygenandnitrogen?.itsantimutagenecit}hasalsobeenevaluatedbySa/l}]()}7el/atjphi)]lllrllll)Isystem'.however.thereisnorepoltofthischemical'sdirecteft'ectontumorcells.Recently,asakindofnon-morpllologicalobservationmethod,electrochemicalmethodhasbeendevelopedforfollowingcellhealthstates#andevaluatingeffec…     

时间分辨荧光免疫分析法间接测定雌二醇

以氯磺酰基噻吩甲酰三氟丙酮（CTTA）为铕（Eu)的螯合剂,羊抗鼠（SAM）的IgG为二抗,用SAM－IgG-CTTA-Eu作标记二抗,建立了以竞争抑制为基础的时间分辨荧光免疫分析测定离雌二醇（E2）的新方法。同均相方法相比灵敏度有很大提高,测定雌二醇（E2）的线性范围为2．5－200pg/mL,检测限为2.5pg/mL。这一方法可望用于E2的临床检测。