A new FDTD scheme analysis for the characteristics of the magnetic‐anisotropic EBG structure

In this article, the new grid finite‐difference time‐domain (NG‐FDTD) method is applied to calculate the dispersion curves of electromagnetic band‐gap structures, and the dispersion characteristics of three magnetic‐anisotropic medium EBG structure are obtained using the NG‐FDTD method. According to these results, we can conclude that the EBG structure of a magnetic‐anisotropic medium, in which the permeability of nondiagonal elements is real, has a much larger band‐stop than that of isotropic EBG. Other magnetic‐anisotropic EBG structures can also increase the first band‐stop. © 2005 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2005.     

On the linear complexity profile of nonlinear congruential pseudorandom number generators of higher orders

Nonlinear congruential methods are attractive alternatives to the classical linear congruential method for pseudorandom number generation. Generators of higher orders are of interest since they admit longer periods. We obtain lower bounds on the linear complexity profile of nonlinear pseudorandom number generators of higher orders. The results have applications in cryptography and in quasi-Monte Carlo methods.     

一种用于调制识别的盲码元定时估计算法

针对通信信号调制识别中的同步分类问题提出一种盲码元定时估计算法,对于调制方式未知的信号,可以估计未知信号的定时同步,得到最佳采样点信息,实现数字信号的同步分类。仿真结果表明本文的算法对于各种信号具有良好的同步效果。     

n-m≥2的高阶极值调节控制系统最优工作点预估研究

利用相关辨识法预估极值调节控制系统最化工作点的方法，推广到n-m≥2的高阶极值调节控制系统，使其应用范围更为广泛。     

进化的建筑——采访柯里斯·威尔金森和吉姆·艾尔

与柯里斯·威尔金森和吉姆·艾尔的访谈围绕9个问题展开,从对“进化的建筑”的解释,到他们对设计理论和方法的阐述,以及时下建筑的发展方向的泛泛讨论,直至他们对中国的一些看法,比较全面地展现了威尔金森·艾尔的设计世界。     

论康德绝对命令的实践理路及价值指归

康德所谓绝对命令是指主体无条件地服从义务以实现道德价值的道德律令。本文论述了绝对命令的双向实践理路：意志自律——绝对命令的我向规定；“以人为目的”——绝对命令的外向要求；理性幸福——绝对命令的价值指归。     

性能好的布尔函数的研究

对n(n=3,4,5)个变量的布尔函数进行了研究,得出了满足平衡性、相关免疫性、SAC和高的代数式次数的布尔函数的精确数目,利用它们可以构造出满足上述特性的任意n(n>5)个变量的布尔函数。     

CVC轧机冷轧宽带材板形控制特性的数值模拟

以六次偶函数拟合宽带材出口横向厚度分布，计算了ＣＶＣ轧机冷轧宽带材前张应力横向分布，首次以张应力横向分布的形式，模拟了ＣＶＣ轧机冷轧宽带材板形控制特性，模拟结果证明：ＣＶＣ轧机冷轧宽带材时具有很强的板形控制能力。     

三维方腔拖曳流的数值模拟

本文推导出一种适用于定常和不定常粘性不可压缩Navier-Stokes方程的分裂步方法。采用Taylor-Galerkin有限元格式进行求解，对有限元等式中关于速度的时间项进行三点向后差分，深入考虑粘性不可压缩流Navier-Stokes方程中对流项的作用，利用二阶Taylor展开完成时间项向空间项的转化，采用张量分析的方法推导了N-S方程分裂步方法的有限元离散格式，并采用低Reynolds数三维方腔拖曳粘性流^[23][24]作为基本算例，检验了这种分裂步方法的稳定性和有效性，同时与大涡模拟相结合对Reynolds数为10000的三维方腔拖曳湍流流场进行了相关的分析，进一步揭示了方腔回流运动的非定常非对称性、流动结构表现为竖轴环流与立面环流相叠加、流速沿垂线分布相对均匀等流动规律，显示了该方法与大涡模拟相结合能够有效地捕捉涡系及其时变过程。     

The equational theory of regular words

Courcelle introduced the study of regular words, i.e., words isomorphic to frontiers of regular trees. Heilbrunner showed that a nonempty word is regular iff it can be generated from the singletons by the operations of concatenation, omega power, omega-op power, and the infinite family of shuffle operations. We prove that the algebra of nonempty regular words on the set A, equipped with these operations, is freely generated by A in a variety which is axiomatizable by an infinite collection of some natural equations. We also show that this variety has no finite equational basis and that its equational theory is decidable in polynomial time.