FINITE DIMENSIONAL BEHAVIOR FOR THE DISSIPATIVE GENERALIZED SYMMETRIC REGULARIZED LONG WAVE EQUATIONS

This paper deals with the asymptotic behaviour of solutions for the generalized symmetric regularized long wave equations with dissipation term. We first show the existence of global weak attractors for the periodic initial value problem of this equations in H2 x H1. And then by an energy equation and an idea of Ghidaglia and Guo, we conclude that the global weak attractor is actually the global strong attractor for S(t) in H2(2) x H1(M).The finite dimensionality of the global attractor is also established.     

脊形波导缝隙天线的共形FDTD分析

采用一种改进的局部网格共形时域有限差分法(FDTD)对脊形波导宽边缝隙天线进行数值分析,该方法部分修改磁场的迭代方程,提高了计算精度。给出了计算所得到的波导缝隙天线阵单元的回波损耗参数(S11)和方向图,通过与实验结果相比较,两者吻合得较好,从而证明了该分析模型和计算方法的正确性与有效性。     

信息主义视野下世界图景的科学及哲学诠 释简

通过对最大信息熵原理（MaximumInformation EntropyPrinciple，MIEP）中约束条件的新理解，进一步把经典的MIEP运用于边界彻底开放的情形，建立起拓展的MIEP。由此不同于现有的诸多前沿理论，提出了一个关于世界的信息过程本体论的论点，并导出了相应的动力学机制，把世界万象描述为一个从无限的深层次的“隐存在”到有限的“具象存在”尔后又回归无限的隐存在”之动态涌现和不断进化的过程，形成一种基于信息过程本体论的世界观，从信息主义的角度对宇宙万象的本质作了统一阐述。     

IMPLICIT—EXPLICIT MULTISTEP FINITE ELEMENT METHODS FOR THE SEMICONDUCTOR DEVICE PROBLEM

The transient behavior of a semiconductor device consists of a Poisson equation for the electric potential and of two nonlinear parabolic equations for the electron density and hole density.The electric potential equation is discretized by the finite element method.The electron and hole density equations are treated by implicit-explicit multistep finite element methods.The optimal L^2-norm error estimates are derived.     

两相流重粒子运动的非线性系统方程组的计算

本文阐述两相流重粒子运动的非线性常微分方程组实际上代表一个系统的方程组,讨论了常用的解法如Runge—Kutta法等和它的结果。本文采取变步长用有限分析法把非线性项线性化,构造一个迭代序列,逐步迭代修正非线性项,求解一般形式的非线性系统方程;并验证迭代逼近解的收缩运算条件;给出计算重粒子运动轨迹和速度的算例,结果分析和说明应用的实例。     

对降维STAP机载雷达的延时混叠转发干扰方法分析

针对降维空时自适应处理(space-time adaptive processing, STAP)在不满足独立同分布(independent identical distribution, IID)训练样本的需求时性能严重下降的问题,提出了一种改进的延时混叠转发干扰方法。该方法主要是通过延时混叠协同频率调制,产生多个距离单元分布可控的假目标,成为STAP前向滤波阶段选取的训练样本的一部分,从而破坏训练样本IID的条件,导致形成的空时自适应权产生主瓣畸变,最终无法获得真实的目标信息。仿真结果表明,该方法产生的假目标数目多且距离单元分布可控,降维STAP系统处理性能严重下降。     

A Strongly-Consistent Difference Scheme for 3D Nonlinear Navier-Stokes Equations

Journal of Systems Science and Complexity - This paper constructs a strongly-consistent explicit finite difference scheme for 3D constant viscosity incompressible Navier-Stokes equations by using...     

A Proposed Gravitodynamic Theory

1.IntRODUCTIONInarecentreviewPaper,Norton[11hasshownthattheprincipleofgeneralcovariancehasbeendisputedasphysicallyvacuous.ThedebateoverthisprinciplePersiststoday.Ingeneralrelativity,spaCe-timecoordinatescanbearbitrarilychosen[2,3]andgravitationalPOtentialsarerepresentedbythemetrictensof,gp.inthefouredimensional(4ro)lineelement:wheregpvhastenindependentcomPOnents,andGreekletterspandvrunfrom0tO3.InEq.(l),d/isan'invariantunderspace--timecoordinatetransformation.However,inordertogetunique…     

Equivalent Joint Space-Time Multiuser Detection for Uplink ISI-Corrupted Multicarrier CDMA Systems with Arbitrary Antenna Arrays

The multicarrier code division multiple access (MC-CDMA) systems without cyclic prefix (CP) hold a fine spectral efficiency though they are unavoidably corrupted by the intersymbol interference (ISI) over the finite impulse response (FIR) channel. We call MC-CDMA systems without CP the ISI-corrupted MC-CDMA systems in some sense. Considering the fact that combining antenna arrays with so-called ISI-corrupted MC-CDMA systems is advantageous in suppressing cochannel interference in cellular communication systems, this paper investigates ISI-corrupted MC-CDMA systems with base station antenna arrays. Joint space-time multiuser detection (MUD) schemes for DS-CDMA systems with antenna arrays have drawn much attention recently. Based upon them, we can derive the equivalent joint spatial-temporal MUD scheme for ISI-corrupted MC-CDMA systems with antenna arrays. In order to achieve this goal, an equivalent space-time estimation method of uplink vector channel is first derived for the ISI-corrupted MC-CDMA syste     

Einstein's Theory of Gravity: Alternative Experiment and Theory

1.INTRODUCTIONThegeneralasanextendedspecial[l]Einsteintheoryofrelativityisabuildingontwocornerstones:thegeneralprincipleofrelativityandtheprincipleofequivalence.BoththeseprinciplesarenotcorrectlyinterpretedbyEinstein[21andothers.Asaresultitmustbeconfessedthatinspiteofa3/4centuryexistenceofthistheoryithasnotfoundtechnicalapplicationsandhasnotchangedourtechnologies.Thisputonusguard.InthisconnectionitisusefultocallintomemorythatthePeriodofkinematicaltheoryofgravitationofPtoiemaeus--KoPeru…     

飞机燃油复杂管道压力瞬态特性分析

针对飞机加装管路系统的压力瞬变过程,给出了流体及管路结构的动特性方程,提出采用特征线法和有限元法相结合的方法来研究流体结构相互作用。通过构造通向机翼12号油箱的1:1地面试验台架,监测加油控制活门关闭时油箱前的动态压力,仿真分析表明:管道应力波与水锤压力波之间会产生能量转换,导致压力的高频脉动及传统基波周期的改变。仿真分析与试验结果的吻合验证了考虑FSI(fluid-structureinteraction)的合理性及所采用方法的正确性。     

Finite element approximation for a class of parameter estimation problems

This paper investigates the finite element approximation of a class of parameter estimation problems which is the form of performance as the optimal control problems governed by bilinear parabolic equations,where the state and co-state are discretized by piecewise linear functions and control is approximated by piecewise constant functions.The authors derive some a priori error estimates for both the control and state approximations.Finally,the numerical experiments verify the theoretical results.     

L ∞-estimates of mixed finite element methods for general nonlinear optimal control problems

This paper investigates L~∞-estimates for the general optimal control problems governed by two-dimensional nonlinear elliptic equations with pointwise control constraints using mixed finite element methods.The state and the co-state are approximated by the lowest order Raviart-Thomas mixed finite element spaces and the control is approximated by piecewise constant functions.The authors derive L~∞-estimates for the mixed finite element approximation of nonlinear optimal control problems.Finally,the numerical examples are given.     

THE SPACE-TIME INTEGRALITY FOR SOLUTIONS OF SOME HIGHER EVOLUTION

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Systematical Scrutiny into Special Relativity

This paper examines some basic propositions of the special relativity theory. A Gedanken experiment is proposed to disprove Einstein's light speed invariance; the 4-dimension invariant seems invalid because it is impossible for the time and spatial coordinate variables to be orthogonal, because of their presumed cross-correlations; and the Lorentz transformation is therefore bounded to have an intrinsic arbitrariness. In addition, the well-known topic of the "relativity of simultaneity" turns out to be a false proposition, because of at least one logical error made by Einstein that violates the two postulates of his own theory. Einstein's theory is flooded with vital errors and flaws, and must be reexamined thoroughly as soon as possible.     

应用多元隶属函数对厅堂测量点的音质效果进行分类

应用模糊集理论 ,将测量点听音效果作为全体测量点这一论域 U上的模糊子集 ,介绍了一种构造多元隶属函数的方法 ,并且把它用于对 2 0个测量点的音质效果进行分类 ,其判别的正确率为90 % .可以作为一种有效的方法应用于厅堂音质的判别过程.     

基于空时二维结构的低旁瓣宽带波束形成

在分析空时自适应处理结构的基础上,提出了一种工程上易于实现的低旁瓣波束形成算法.虚拟了不同幅度、不同频点、不同方位角的干扰源,使得空时二维方向图的主瓣指向期望信号来波方向的同时,在其他方向上形成低旁瓣,达到抑制干扰和噪声的目的.由于此算法权值是已知系数矩阵与当前时刻期望信号的空时二雏导向矢量的乘积,计算量简单,避免了传统线性约束算法中多次矩阵求逆的复杂运算,既保证了抗干扰性能又便于工程实现.     

基于引力场模型的城市轨道交通与城市发展的相关性

城市快速轨道交通是一种快速、便捷、大容量的公共交通系统，它不仅有效地缓解了城市的交通压力，同时城市轨道交通的规模和线路走向也同城市的空间结构发展密切相关。本文在对原有城市引力模型加以修正的基础上引入城市引力场概念。建立了城市轨道交通条件下以交通时间为基础的城市引力场模型，并对参数的影响因素和变化趋势进行了讨论。最后以上海为实例，按建设城市轨道交通的时间顺序绘制了不同时期城市引力场分布图，揭示了城市轨道交通建设与上海发展的密切关系，指出规划中的上海城市轨道交通网对形成“多中心”的城市空间结构具有积极的促进作用。     

空时MIMO无线通信系统随机信道模型的仿真研究与实现

对智能天线、空间分集和MIMO OFDM等多天线技术的信道传输特征进行了分析,提出了一种用于第三代及多天线MIMO无线通信系统的信道模型。该信道模型不仅涉及到接收信号的功率水平分布和多普勒频移,还考虑了信道衰落系数间的相关性以及智能天线阵列的几何分布和到达角度等特性。用3GPP通信协议基于Matlab实现了一个完整的MIMO信道仿真器。最后,通过实验验证了不同无线通信环境下MIMO模拟的信道容量与Shan non理论容量的一致性,从而说明了该仿真器的有效性和实用性。     

作战想定的形式化表述方法研究

作战想定是作战仿真中军事与技术沟通的桥梁,需要通过形式化的方式进行有效的表述.从作战需求和仿真系统开发技术出发,通过分析抽象提出了作战想定形式化表述的W5(Who, When, Where, What, hoW)原则,并进而对作战单元的时空运动和使命任务规划方法进行研究,提出了一种基于原子条件和原子行为的任务规划方法,最后介绍了采用这一研究结果开发实现的一个作战仿真系统.