非结构网格迎风格式中的一种重构方法研究

研究了一种基于网格节点重构的二阶迎风格式在非结构网格无粘流场计算中的应用，提出了一种新的网格节点流场参数的重构方法。并通过ONERA M6机翼、带副翼的直机翼、翼身组合体以及翼身组合体带增升装置无粘绕流流动计算对该重构方法进行了验证。算例表明新方法可以在确保格式精度和不显著增加流场计算时间的前提下，明显改善迎风格式的稳定性、收敛性和鲁棒性，减小了网格质量对流场求解精度的影响，因此十分适合非结构网格计算复杂外形流场时使用。     

柱塞悬浮式单体液压支柱

在对DZ型单体液压支柱研究的基础上，提出了采用柱塞悬浮式单体液压支柱的新概念．介绍了DWX型柱塞悬浮式单体液压支柱的工作原理及结构特点．通过受力分析和强度计算，得出了其活柱和油缸的受力特点和强度计算公式；通过稳定性分析和计算，得出了其稳定性计算公式和稳定性安全系数标准．所研制的新型单体液压支柱具有结构工艺简单、工作行程大、使用范围大、稳定性安全系数大、重量轻、操作安全可靠等特点．并采用QPQ氮化处理工艺和Ni—P化学镀层工艺，使其具有防腐，耐磨，防炮崩等特点．     

BaTiO_3对SnO_2基CO气敏元件性能影响

通过掺入BaTiO3来调整SnO2基CO气敏元件的温度系数,进而改善气敏元件的长期稳定性。元件的各种性能与BaTiO3的性质和含量密切相关。当掺入质量分数为2%的含YCl3摩尔分数为0.4%的BaTiO3时,元件的烧结温度升高,抗酒精的干扰能力增强,元件的长期稳定性得到了改善。     

153Sm-葡庚糖酸钠的制备

研究了制备条件对153Sm标记GH的影响及标记物的体外稳定性,建立了有效的153Sm标记葡萄糖酸钠(GH)方法。结果表明:用通氮敞开体系、沸水浴加热的标记方法,反应时间不低于30min,GH浓度不低于2.4×10-2mol/L时,可获得标记率大于98%的153Sm-GH;用高比活度153Sm(～4.5TBq/g(Sm))标记,其比活度可达14GBq/g(GH)。该标记物在室温下具有较好的稳定性,放置40h内,其放化纯度>96%。     

模糊关系极限方程及其求解

模糊关系方程在模糊推理、模糊控制中有着重要的应用，语言变量模糊控制器的稳定性设计与模糊关系方程求解密切相关。由模糊控制系统稳定性判据首先导出了一类模糊关系极限方程，接着讨论了这类极限方程解的结构、最小解的存在性，并给出基于路径分析的模糊关系方程的求解方法。     

用均匀设计方法研究药皮辅料与稳弧性的关系

运用均匀设计方法，研究了交流电弧稳定性与焊条药皮辅料之间的关系，建立了二者之间的数学模型．方差分析表明，回归方程呈高度显著，并给出了三种辅料交互作用对稳弧性影响规律曲线，用以预测电弧稳定性或控制药皮辅料的配比，也可以直观地分析焊条药皮辅料的作用.     

一类不确定性Lurie系统的鲁棒绝对稳定性分析

通过构造Lyapunov函数，提出了不确定性在满足非结构前提下Lurie系统Robust稳定的充分条件，并验证了这个条件。     

On bounds for the existence of a bistable controller

By we shall denote the set of polynomials nonzero on the closed disk {z: |z|r}. The problem to be studied is given as follows.Avoidance Problem. Given polynomials A and B, nonnegative integers n, m, and positive numbers r₁, r₂, r₃, determine if there exist , with degrees n and m, respectively, such that AP+BQ is in .It is shown that the Avoidance Problem for r₁=r₂=r₃=1 is equivalent to the well-known Bistable Stabilization Problem for a large class of control systems.Also, a general class of optimization problems for solving the Avoidance Problem is introduced. The class of optimization problems includes problems with sets more general than disks . In addition, an algorithm is proposed for solving these optimization problems, and numerical experience is reported.As an application, bistable controllers for the plant are shown to exist for values of β as low as 0.0246, thus improving on previously reported results by Blondel et al. for this difficult case.Furthermore, it is shown how in some cases it is possible to find optimal controllers by using a combination of numerical and algebraic techniques, and a variant of the algorithm already introduced. As an example, a low order controller is found for for the case when .This method could be applied to other problems where the plant depends on a parameter.     

含时变滞后的不确定系统的时滞相关型鲁棒控制设计

研究含时变滞后的不确定系统的控制综合问题. 基于Lyapunov方法提出了一种含滞后补偿的鲁棒控制设计方法. 闭环稳定性条件由一组线性矩阵不等式表示. 在这些条件中给出了稳定性和滞后以及其导数之间的关系. 实例显示, 利用提供的方法所给出的结果比以往文献给出的结果保守性小.     

Robust stability of a special class of polynomial matrices with control applications

The robust stability problem of uncertain continuous-time systems described by higher-order dynamic equations is considered in this paper. Previous results on robust stability of Metzlerian matrices are extended to matrix polynomials, with the coefficient matrices having exactly the same Metzlerian structure. After defining the structured uncertainty for this class of polynomial matrices, we provide an explicit expression for the real stability radius and derive simplified formulae for several special cases. We also report on alternative approaches for investigating robust Hurwitz stability and strong stability of polynomial matrices. Several illustrative examples throughout the paper support the theoretical development. Moreover, an application example is included to demonstrate uncertainty modeling and robust stability analysis used in control design.