具有挠性附件充液运动体的姿态动力学与控制

研究了一类带挠性附件的充液运动体的姿态运动及其控制，建立了系统的运动微分方程；给出了刚体、液体和弹性体的控制律；利用现代数学方法；得到了受控系统姿态渐近定位和指数镇定的结果。     

Bacterial suicide through stress

Outside of the laboratory, bacterial cells are constantly exposed to stressful conditions, and an ability to resist those stresses is essential to their survival. However, the degree of stress required to bring about cell death varies with growth phase, amongst other parameters. Exponential phase cells are significantly more sensitive to stress than stationary phase ones, and a novel hypothesis has recently been advanced to explain this difference in sensitivity, the suicide response. Essentially, the suicide response predicts that rapidly growing and respiring bacterial cells will suffer growth arrest when subjected to relatively mild stresses, but their metabolism will continue: a burst of free-radical production results from this uncoupling of growth from metabolism, and it is this free-radical burst that is lethal to the cells, rather than the stress per se. The suicide response hypothesis unifies a variety of previously unrelated empirical observations, for instance induction of superoxide dismutase by heat shock, alkyl-hydroperoxide reductase by osmotic shock and catalase by ethanol shock. The suicide response also has major implications for current [food] processing methods. Received 29 March 1999; received after revision 14 May 1999; accepted 17 May 1999     

PC空间上泛函微分方程解的存在唯一性及应用

研究某类不连续初始函数空间上有限时滞泛函微分方程解的存在唯一性，并应用它来讨论脉冲泛函数微分方程的某些局部理论。     

Stereoselectivity in mammalian chemical communication: Male mouse pheromones

Two male mouse pheromones, 3,4-dehydro-exo-brevicomin (DHB) and 2-sec-butyldihydrothiazole (SBT), are chiral molecules which were previously tested in their respective bioasays as racemic mixtures. The focus of this study has been to determine the absolute configuration of their natural forms and its relation to stereospecific biological action. DHB was established as the R,R-enantiomer possessing biological activity. Due to an extremely easy racemization of SBT under very mild conditions, enantioselectivity of its transmission and its action at the receptor site appear to be of secondary importance.     

煤矿安全生产预防预警机制和应急预案及其关键技术研究

分析了煤矿建立事故预警机制及应急预案的必要性,探讨了重大事故应急预案的核心要素,展望了煤矿应用预警机制和应急预案的前景。     

远场涡流三维缺损响应的仿真研究

应用有限元方法，采用Ａ，Ｖ－Ａｓ－ψ位函数计算并结合三维场数值计算中的子结构－波阵法，给出了一种能在微机上对远场涡流的三维缺损响应的进行仿真的方法，同时重点研究了相同体积的周向和轴向缺损响应信号及管中涡流分布。研究结果表明，轴向缺损引起的涡流畸变小于周向缺损时的变化，故周向缺损响应信号大于轴向缺损的响应信号。     

聚ω-甲硒基十一烷基硅氧烷铂配合物的合成及其催化烯烃硅氢化性能

ω-氯代十一烷基三乙氧基硅烷依次用气相法二氧化硅固载、甲硒基钠硒化,再与氯亚铂酸钾作用,合成了聚ω-甲硒基十一烷基硅氧烷铂配合物．研究了该铂配合物对烯烃与三乙氧基硅烷的硅氢加成反应的催化特性．结果表明,当反应温度为80℃,催化剂用量为底物的万分之六时,该铂配合物对所用烯烃表现出很高的催化活性,且回收再用时其活性基本不变．     

混合时滞系统的BIBO稳定性

根据Lyapunov稳定性的理论,利用Lyapunov-Krasovskii泛函方法并结合不等式的技巧,研究了非线性扰动混合时滞系统的BIBO稳定性,分析了系统在闭环状态下的BIBO稳定,所得的结果推广了已有文献的有关内容。     

基于响应面法的海上油藏注气参数设计方法

针对海上低渗油藏注气方案设计受平台环境、油藏特征和工艺条件等众多因素影响而复杂烦琐的问题,将响
应面方法引入水气交替驱方案的设计中。在确定了少量但具有代表性的气驱方案的基础上,通过对其结果的统计分
析,形成了采收率指标与注气时机、水气比、周期注入段塞3 个因素之间的预测模型与响应曲面,并在此基础上开展了
注气参数优化设计。通过该方法可以对研究范围内的气驱方案进行高效地设计、预测和优化,简洁、直观地确定最佳
气驱方案,科学、高效地实现设计目标,提高了海上低渗油藏气驱设计工作的效率和质量。