On using exponential basis functions for laminates modeled by CLPT,FSDT and TSDT: Further tests and results

In this paper we present some results from the application of a mesh-free method introduced previously (Compos Struct 2011;93:3112–9 and 94:84–91) for bending analysis of laminated composite plates. This method is applicable to a wide range of bending problems without limitation in the stacking sequence of the laminated plates and the boundary conditions. Herein, two specific types of problems, having traction free boundaries, are examined and the issues related to the solution of them are addressed. Also as new benchmark problems, some more results for cross-ply and angle-ply composites are presented.     

基于过采样投影近似基追踪的无人机异常检测

针对无人机飞行模式切换导致飞行数据在线异常检测准确率低的问题,提出基于过采样投影近似基追踪(OSPABP)的在线异常检测框架。首先利用滑窗和Z-score变换消除飞行数据流量纲,并抽取相关的飞行数据子集;然后过采样当前时刻子集的输入数据,放大异常数据对数据子空间的影响,并通过在线估计和追踪匹配过采样后数据子空间的投影近似基方向变化,从而判断子集实时输入数据的异常程度。同时该方法还可抑制飞行模式切换对异常检测效果的影响。采用Flight Gear模拟飞行数据和明尼苏达大学真实无人机飞行数据的实验结果表明,所提出方法对飞行模式切换敏感度低,可明显降低异常检测的误检率,并有效提高检测准确率。此外,算法的计算和存储复杂度均可满足机载处理要求。     

Cascadic meshfree method for the elliptic Monge–Ampère equation

The elliptic Monge–Ampère equation is a fully nonlinear partial differential equation, which originated in geometric surface theory and has been widely applied in dynamic meteorology, elasticity, geometric optics, image processing and others. The numerical solution of the elliptic Monge–Ampère equation has been a subject of increasing interest recently. In this paper, we design a cascadic algorithm which is meshfree. We first generate hierarchical scattered data sets. Then on each successive refinement levels, the Monge–Ampère equation can be solved by Kansa's method. We call this method as cascadic meshfree method (CMF). Different from cascadic multigrid method, CMF avoids tedious interpolation and is more easy for implementation and coding. Finally, numerical experiments confirm the efficiency and robustness of CMF method.     

电石法PVC企业催化剂研发体系的设想与建立

介绍了电石法聚氯乙烯企业应对汞资源减少和汞污染问题,建立企业催化剂研发体系的思路设计与实施过程,并提出了相应的建议。     

Correlation-spectral transformation of signals in adaptive sequential basis

A procedure for deriving a system of stochastic sequential basis functions is described. It is shown that the use of these functions for correlation and spectral analysis of stochastic signals substantially reduces and simlifies computing operations. A simple method of calculation of the spectrum of variances is given. Translated from Kibernetika i Sistemnyi Analiz, No. 3, pp. 159–164, May–June, 2000.     

DE+RBFNs based classification: A special attention to removal of inconsistency and irrelevant features

A novel approach for the classification of both balanced and imbalanced dataset is developed in this paper by integrating the best attributes of radial basis function networks and differential evolution. In addition, a special attention is given to handle the problem of inconsistency and removal of irrelevant features. Removing data inconsistency and inputting optimal and relevant set of features to a radial basis function network may greatly enhance the network efficiency (in terms of accuracy), at the same time compact its size. We use Bayesian statistics for making the dataset consistent, information gain theory (a kind of filter approach) for reducing the features, and differential evolution for tuning center, spread and bias of radial basis function networks. The proposed approach is validated with a few benchmarked highly skewed and balanced dataset retrieved from University of California, Irvine (UCI) repository. Our experimental result demonstrates promising classification accuracy, when data inconsistency and feature selection are considered to design this classifier.     

Basis Set Extrapolation for the High Resolution Spectroscopy

Valence and all electron correlation energies of a large set of atoms and molecules with structural motifs from amino acids and peptides at their equilibrium as well as non-equilibrium geometries are calculated at the levels of MP2, RI-MP2, and CCSD （T） with Dunnings sequential correlation consistent basis sets. A two point basis set extrapolation scheme for correlation energies to the complete basis set limit based on only DZ （double-zeta） and TZ （triple-zeta） results is presented and analyzed. We show that this basis set extrapolation scheme reduces the computational cost by two to three orders of magnitude to obtain the same accuracy as simpler extrapolations from higher order basis set computations.     

Double ionization energy spectra of small alkali-metal clusters

In this article, we calculate the spectra of the double ionization energy (the energy required for adding two electrons to the neutral system) of small alkali-metal clusters (K₂ and Li₂) including the effect of electron–electron short-range correlation by adding two one-particle energies within the GW approximation and taking into account the electron–electron repulsive interaction effectively.     

无工装定位数模测量技术试验设计论证

为了解决在无工装定位的条件下激光跟踪仪能直接测量产品,制订了数模测量技术试验设计论证方案。通过对坐标系建立与转换有序地试验设计实施、测量基准点约束和自由两种状态下的翔实严谨的科学试验论证、测量数据在三维数模(CATIA理论数模)分析、经过四次生产现场产品的测试,获得了科学的实验成果、专利产权的试验设计成就。研究的成果是减少了检验工装或替代了工装,可用于实地测量产品的尺寸、形状、位置、空间等真实状态,得到的三维数据精确可靠且直观,为工程设计解决当前飞机活动面交点不协调难题提供了准确的数据,技术含金量高操作又简便。实验表明无工装定位数模测量技术在航空航天产品制造测控领域中大有应用发展前景。