含油废水的超临界水氧化反应机理及动力学特性

针对传统的处理方法不能有效地去除油田开采废水中化学需氧量(COD)的缺点,引入超临界水氧化法作为含油废水的深度处理技术,研究了含油废水在超临界水中的氧化降解过程,并用自由基反应机理解释了超临界水氧化反应的机理.实验结果表明:超临界水氧化法是一种高效快速的有机废物处理技术,COD的去除率近90%;反应温度、停留时间是影响废水COD去除率的主要因素,随着反应温度、停留时间的增加,废水COD去除率显著增大;氧化反应对废水的反应级数为1.62,对氧为0.22,反应活化能和频率因子分别为(92.2±9.9)kJ.mol-1和(3.53±3.33)×103,所建立的反应动力学模型与实验结果的偏差在±10%之内.此外,在分析综述基础上指出了超临界水氧化处理过程存在的问题及可能的解决方法.     

基于气泡尺度的泡沫压裂液流变机理研究

从介观层次入手，以高压高剪切速率下气泡尺寸均匀分布的泡沫压裂液为基础，建立了一个二维泡沫压裂液物理模型．该模型视泡沫压裂液的最小组成单元为气泡，将气泡和周围液相以及气泡与气泡之间的作用力用弹簧表示，并从能量耗散的角度出发，成功推导了当泡沫质量（气相的体积分数）大于70％、剪切速率大于500s^-1时的泡沫压裂液流变特性的本构方程．利用该本构方程计算得到的泡沫压裂液有效黏度和试验结果对比最大误差只有9．7％，平均误差只有4．9％，所得结果明显地优于Reidenbach和Mathel等人给出的拟合公式．该模型不仅可以从机理上阐述泡沫压裂液的流变特性，而且还能够很好地表现出泡沫压裂液在泡沫质量较高时的有效黏度特性．更为主要的是该模型还可以用于解释泡沫压裂液的屈服应力和壁面滑夥现象．     

面向快速原型的数据处理与三维造型一体化软件系统

基于MDT软件环境，开发了面向快速原型（RP）的数据处理与三维造型一体化软件系统．首先对系统的集成框架进行描述，然后在深入研究MDT软件平台下CAD模型数据的内部表达方法以及拓扑信息和几何信息提取方法的基础上，运用基于网格划分的曲面与平面求交原理，构造并实现了一种法矢和面积双重判据的自适应直接分层算法．按照所提出的新型二维层片数据文件格式，运用VC＋＋6．0和MDT软件应用程序开发接口，对MDT软件进行二次开发，从而实现了CAD造型与RP数据处理的无缝集成．研究结果表明，该系统具有良好的柔性和实用性，可有效提高快速原型制件质量和简化数据前处理的过程。     

大射电望远镜馈源柔索支撑系统的建模与控制

根据柔索精确的悬链线解析表达式，推导出了两端固定时柔索初始长度与拉力之间的关系，从而能够精确而高效地获得柔索对两端节点的拉力，在此基础上应用牛顿-欧拉法建立了大射电望远镜馈源柔索支撑系统的动力学简化模型．针对该系统的非线性、慢时变、多变量耦合等特点，提出了一种带有自调整因子和比例积分校正环节的双模糊控制器来实现馈源轨迹跟踪．采用双模糊控制器对所建立的动力学模型进行了系统控制仿真实验．结果表明，该控制系统不仅能较好地跟踪期望信号，而且能满足馈源柔索支撑系统轨迹跟踪精度要求．     

Zircon SHRIMP U-Pb dating for the Cangshuipu volcanic rocks and its implications for the lower boundary age of the Nanhua strata in South China

Continental volcanic rocks and volcaniclastic sedi-mentary conglomerates of the Cangshuipu Formation oc- cur as wedge-shaped Neoproterozoic strata in the Yiyang region, Hunan Province. They overlie with a high-angle unconformity the Lengjiaxi Group of the Upper Meso- proterozoic Eonothem. The wedge-shaped Neoproterozoic strata of the continental clastic rocks and the Mesopro-terozoic deep marine flysch turbidites of the Lengjiaxi Group represent two distinct stages of basin-tectonic evo-…     

Numerical analysis on intermittent flow in a longitudinal section of Bingham fluid along a slope

The transition process of intermittent flow in a longitudinal section of Bingham fluid from initial distribution to fully developed state was numerically investigated in this paper. The influences of slope θ. dimensionless runoff Q* and viscosity μ0* on the dimensionless surge speed U* were also presented in a wide range of parameters. By one typical example, the intermittent flow possessed wave characteristics and showed a supercritical flow conformation for a fully developed flow. The distributions of gravity and bed drag along the flow path and the velocity distribution of flow field were also analyzed.     

Modulating multidrug resistance through inhibiting of protein kinase C activity by phenothiazines

In the present study, actions of phenothiazines(PTZ) in reversing multidrug resistance(MDR) and inhibiting PKC activity were investigated. It was found that the three PTZs caused 2.49, 36.58 and 75.78 fold reversal of K562/AO2 MDR cells resistant to adriamycin, respectively, while the chemosensitizer verapamil caused 40 fold reversal in the same condition, indicating that PTZ11 is a novel reversal agent of MDR and a potential chemotherapeutic reagent for tumor therapy. PKC activity analysis in the presence of PTZs showd that PTZ6 and PTZ11 inhibited rat brain protein kinase C activity in a manner of dose_dependent. The IC 50 values were (489.77±31.4) and (113±9.64) μmol/L, respectively. PTZ7 had no inhibition on PKC activity. Further study showed that PTZ11 could reduce PMA_mediated activation of PKC in a manner of dose_dependent, suggesting that PTZ11 might compete for the high_affinity phorbol ester binding site within PKC molecule. Recently, an X_ray structure of PMA in complex with PKC Cys2 activator_binding domain was solved. We therefore decided to explore the possible binding model of PTZ11 with PKC molecule using SYBYL 6.02 program. It was shown that the binding site of PTZ11 with PKC molecule partially overlapped with that of PMA, providing for the first time new data for designing PKC inhibitors and MDR reversal drugs.     

头部重点低温对缺血后再灌注时兔脑神经元转归的影响

探讨头部重点低温（ＳＨＣ）能否改善受损兔脑神经元的转归,以及相应的生化机制,方法：采用“四血管”模式造成脑缺血３０ｍｉｎ,然后将１６８只新西兰兔随机分为三组,Ｉ组为未缺血对照组,其余两组动物的３个来组均在缺血３０ｍｉｎ后分别再灌注３０,１８０和３６０ｍｉｎⅡ组为常温财灌注组,Ⅲ组为ＳＨＣ治疗组,开始再灌注时实施ＳＨＣ（２８℃）,检测了脑组织中２１项生化指标的变化和采用计算机图像分析技术,将１２个脑     

煤层动压注水的现场实验研究

主要以西山矿务忆官地矿３２３０３工作面高压注水为例,实测了高压注水时,注水压力,注水量与时间的变化规律及煤体的湿润情况与防水效果,论述了煤体高压注水及防尘机理。