一类函数不定积分的简捷求法

以矩阵为工具，给出了一类函数不定积分的简捷求法，用此法求形如：∫ｓｉｎｐｘｃｏｓｑｘｄｘ，∫ｃｏｓｐｘｃｏｓｑｘｄｘ，∫ｓｉｎｐｘｓｉｎｑｘｄｘ，∫ｅｐｘｓｉｎｑｘｄｘ，∫ｅｐｘｓｉｎｑｘｄｘ，∫ｓｉｎａｘｓｉｎｂｘｓｉｎｃｘｄｘ等类型的不定积分较方便，并给出了方法的理论依据，又通过实例指出了方法的具体运用，结果是有意义的．     

一种提高冲激雷达信噪比的方法

提出一种基于取样平均器的提高冲激雷达信噪比的方法 ,采用了一种新型的高时间分辨率取样积分器 ,解决了采样和积累的矛盾 ,实现了信号的多次积累。分析和实验表明 ,在高距离分辨率下 ,不但使信噪比有很大程度的改善 (可实现 1 0 0 0 0次积累 ) ,而且采样效率高 ,还可工作于高重复频率     

具有波动算子的非线性Schrdinger方程的Preissman格式

探讨了具有波动算子的非线性Schr dinger方程的多辛格式.用隐式中点公式离散多辛方程组得到多辛Preissman积分.用数值实验验证了理论分析的正确性.     

Exponential Integrators for Quantum-Classical Molecular Dynamics

We study time integration methods for equations of mixed quantum-classical molecular dynamics in which Newtonian equations of motion and Schrödinger equations are nonlinearly coupled. Such systems exhibit different time scales in the classical and the quantum evolution, and the solutions are typically highly oscillatory. The numerical methods use the exponential of the quantum Hamiltonian whose product with a state vector is approximated using Lanczos' method. This allows time steps that are much larger than the inverse of the highest frequencies.We describe various integration schemes and analyze their error behaviour, without assuming smoothness of the solution. As preparation and as a problem of independent interest, we study also integration methods for Schrödinger equations with time-dependent Hamiltonian.     

一种新的SC浮地电流回转型负阻抗变换器

本文提出了一种新的,包含有一个射极跟随器和一个积分器的开关电容(SC)浮地电流回转型负阻抗变换器电路结构,对于该电路结构进行了实际模拟和测试.     

对ACAR-GHAUSI连续时间积分器结构的改进

本文提出增加一个匹配 MOS 管作为 Acar-Ghausi 连续时间积分器结构的改进。结果得到偶次和奇次非线性失真的全部补偿,其传输函数与阈电压 V_T 无关,减小了温度和本体影响。     

基于VXI总线的四路门控积分器模件的研制

 介绍了一个基于标准总线VXI的四路门控积分器模块插件。在四路独立的纳秒门控积分电路的基础上,采用VXI寄存器基接口实现对各路门控积分器的数据采集和控制,采用Labwindows/CVI编写了数据采集系统软件,从而完成了纳秒级门控积分器的实用化的基本工作。电子学测试结果和现场打靶结果表明该系统完全符合实用系统的要求。     

A symplectic, symmetric algorithm for spatial evolution of particles in a time-dependent field

A symplectic, symmetric, second-order scheme is constructed for particle evolution in a time-dependent field with a fixed spatial step. The scheme is implemented in one space dimension and tested, showing excellent adequacy to experiment analysis. Higher order schemes are deduced by composition.     

Analytical Stability Bound for a Class of Delayed Fractional-Order Dynamic Systems

Delayed Linear Time-Invariant (LTI) fractional-order dynamic systems areconsidered. The analytical stability bound is obtained by using Lambertfunction. Two examples are presented to illustrate the obtainedanalytical results.