Symplectic Topology of Integrable Hamiltonian Systems, II: Topological Classification

The main purpose of this paper is to give a topological and symplectic classification of completely integrable Hamiltonian systems in terms of characteristic classes and other local and global invariants.     

一种求闭环频率特性的图解法

本文介绍的求闭环频率特性的图解法，其特点是不用Ｎｉｃｈｏｌｓ图线或等Ｍ圆、等Ｎ圆图，而是通过向量叠加的办法，由开环频率特性求闭环频率特性。该方法计算量少，简单方便，适用于自动控制系统的分析与设计。     

Asymptotic Bound on the Characteristic Function of Signed Linear Serial Rank Statistics

This work establishes an asymptotic bound on the characteristic function of signed linear serial rank statistics. The result is obtained under rather general conditions including the important case of van der Waerden scores. It generalizes the result of Seoh (1983, Ph.D. Thesis, Department of Mathematics, Indiana University) and constitutes an essential step to the elaboration of Berry-Esséen's bounds and the establishment of Edgeworth expansions. These statistics constitute a natural tool for testing the hypothesis of white noise with a symmetrical (unspecified) distribution in comparison to other alternative hypothesis of serial dependence.     

三波非共线作用参变过程的相位匹配研究

对各向异性单轴和双轴非线性晶体中三波非共线作用参变过程的相位匹配进行了详细的研究，给出了参变光在非线性晶体主平面内传播的所有非共线参变过程可能的相位匹配类型和相位匹配条件，并推出了所有可能的非共红参变过程的临界相位匹配解的解析表达式。     

APPLICATION OF MOLECULAR ORBITAL GRAPH THEORY——A CUTTING-OFF BOND FORMULA FOR α_k

The graph formula for the coefficient α_k of the HMO characteristic polynomial hasbeen obtained by means of the molecular orbital graphic theory, and thus the closedformulas for the homologous conjugated molecule are given.     

关于全图补图的完美匹配

G是一个简单图,变换图G---是G的全图的补图.证明了对于给定的一个图G,G K1 K2,G---有一个完美匹配的充要条件是V(G) E(G)是偶数.     

TTL门电路的Pspice仿真分析

应用Pspice对分立元件TTL反相器的逻辑特性和电气特性进行定量分析，加深对TTL门电路工作原理的理解。     

自控设计中调节阀流量特性的选用问题

文中分析了调节阀的理想流量特性到工作流量特性的畸变原因及其畸变过程，介绍了流量特性的选择步骤及方法，并就如何提高调节阀的适应性和调节阀选用中应注意的问题进行了探讨。     

Invariants de Maslov équivariants

We construct two cohomological invariants associated to pairs of Lagrangian sub-bundles of a symplectic bundle on a compact manifold upon which a compact Lie group is acting. The first invariant, which we call the classical equivariant Maslov H-invariant, provides an obstruction to Lagrangian transversality and lives in the Borel cohomology. The second invariant, which we call the equivariant Maslov U-invariant, generalises the author's results in K-Theory 13 (1998), 347–361 to the equivariant context and provides a necessary and sufficient condition for equivariant Lagrangian transversality, up to homotopic stability, and lives in the U-theory (intermediate between the real complex K-theories). As an application, we show that two Lagrangian sub-bundles of a symplectic bundle on a homogeneous space are always stably transverse.     

W-Mo系复合材料的制备及其特性波阻抗

 采用放电等离子烧结技术，在相同的温度（1 473 K）及压力（30 MPa）下，制备出不同配比的致密的W-Mo系复合材料样品。采用高精度超声波脉冲回波重合方法，精确测量了超声波在样品中传播的横、纵波声速，并由此得到样品的特性波阻抗值。对样品的相组成分析及电子探针分析的结果表明，W-Mo系复合材料主要是以W、Mo机械混合的形式通过粘结相获得致密化的。因此，选用混合物模型对其特性波阻抗值进行了理论预测，与实测值的比较表明该模型能对W-Mo系复合材料的特性波阻抗作出比较准确的预测。