环境系统决策的专家排序法

文中根据系统分析的 Delphi 法和位分值法,提出了专家排序法,决策结果较为客观、合理对解决环境系统决策问题有一定指导意义。     

Effective Periodic Poling in Optical Fibers

The distributions of electric field and induced second‐order nonlinearity are analyzed in the periodic poling of optical fibers. A quasi‐phase matching efficiency for the induced nonlinearity is calculated in terms of both the electrode separation distance between the applied voltage and generalized electrode width for the periodic poling. Our analysis of the quasi‐phase matching efficiency implies that the conversion efficiency can be enhanced through adjusting the separation distance, and the electrode width can be maximized if the electrode width is optimized.     

ADPTIVE INTERFERENCE CANCELER BASED ON FOURTH ORDER CUMULANT

An adaptive interference cancler algorithm based on fourth-order cumulant is proposed to overcome the fault of conventional autocorrelation-based Least Mean Square (LMS)algorithm which cannot suppress the correlated Gaussian noises. The recursive formulation of the proposed algorithm is given to reduce its computational complexity. The simulation results are presented to demonstrate the effectiveness of this novel approach.     

基于一阶差分的粗差剔除方法

粗大误差的剔除是数据处理的重要内容。本文提出了基于一阶差分的分位数粗大误差剔除方法。实验证明，该方法与带通滤波器的结合可以取得良好的滤波效果，并在流化床压力信号的处理中得到了成功的应用。     

Pro/E明细表快速生成及零件自动标序时的汉字应用

介绍了在Pro/E2001软件的Pro/DETAIL模块中,用中文字体快速实现零件自动标序以及生成明细表的特殊功能。通过实例给出了这种特殊功能的使用方法和技巧。该方法和技巧能极大地提高工程技术人员的设计效率和设计准确性。     

一类四阶半正边值问题正解的存在性

证明了四阶半正边值问题　　 y( 4) -λf(x ,y) =0 ,0 0且充分小时正解的存在性 ,应用的工具是锥上的不动点定理。     

一种新的RBAC角色协同关系及其Petri网模型

角色授权约束是RBAC研究的重要内容.有效表达多角色授权和激活的序约束是一个难点问题.提出了新的角色授权协同及其序关系,扩展了现有的角色关系概念,使RBAC能够表达复杂的角色授权和激活序约束.其次,提出了角色授权协同及其序关系一致性分析和模拟的时间Petri网方法.     

脉冲啁啾对高次谐波谱影响的理论研究

采用单电子近似和软核势模型 ,通过数值求解一维含时薛定谔方程的方法 ,研究了当脉冲分别带有正、负啁啾的情况下所产生的高次谐波谱的变化。结果表明 ,对于正啁啾脉冲 ,其高次谐波谱将出现分裂 ,而对于负啁啾 ,高次谐波谱呈现展宽的趋势。同时发现 ,在激光脉冲带有很大的啁啾的情况下 ,无论是正啁啾还是负啁啾 ,都会使谐波峰分裂成多个更加细小的谱峰     

Optimized High-Order Derivative and Dissipation Operators Satisfying Summation by Parts,and Applications in Three-dimensional Multi-block Evolutions

We construct optimized high-order finite differencing operators which satisfy summation by parts. Since these operators are not uniquely defined, we consider several optimization criteria: minimizing the bandwidth, the truncation error on the boundary points, the spectral radius, or a combination of these. We examine in detail a set of operators that are up to tenth order accurate in the interior, and we surprisingly find that a combination of these optimizations can improve the operators’ spectral radius and accuracy by orders of magnitude in certain cases. We also construct high-order dissipation operators that are compatible with these new finite difference operators and which are semi-definite with respect to the appropriate summation by parts scalar product. We test the stability and accuracy of these new difference and dissipation operators by evolving a three-dimensional scalar wave equation on a spherical domain consisting of seven blocks, each discretized with a structured grid, and connected through penalty boundary conditions. In particular, we find that the constructed dissipation operators are effective in suppressing instabilities that are sometimes otherwise present in the restricted full norm case.     

瞬时进货、允许缺货的租赁库存系统存贮模型

在经典的瞬时进货、允许一定量缺货的库存系统存贮模型的基础上,建立考虑经典的最佳存贮批量Q*1大于企业仓库容量Q0时,瞬时进货、允许缺货的租赁库存系统存贮模型,并确定了最优存贮策略。