化工工艺设计常用基础数据的数学模型

利用化工工艺设计中的最新资料与数据，采用计算机回归分析技术，得到现代化工工艺设计中常用的理化数据的数学模型，供有关化工工艺设计人员进行计算机辅助化工工艺设计时直接使用．     

动态分布参数神经网络及其稳定性分析

文中将Ｈｏｐｆｉｅｌｄ型有限状态空间动态神经网络推广到无穷维状态空间动态神经网络，即动态分布参数神经网络（ＤＤＰＮＮ），并给出了它们的有界性和稳定性，尤其是，还研究了带有微分算子的多维分布参数神经网络的时空稳定性以及在保证稳定性情况下所应满足的边界条件，文中从理论上完善和发展了动态神经网络。     

Propagation properties of a non-canonical vortex beam in a high numerical aperture system

A non-canonical vortex is an optical helical phase structure with the same topological charge of a canonical vortex but different phase distributions. Based on the Richards&Wolf vectorial diffraction theory, the expression for the strongly focused, linearly polarized non-canonical vortex beam is derived, and its propagation properties are studied numerically in the focal region. It is that the transverse focal shift does not only occur in the strongly focused, off-axis (or on-axis) canonical vortex beams, but also can be seen in a strongly focused, non-canonical vortex beam. The transverse focal shift in these two fields have the same form, but the factors influencing them are quite different. It is also demonstrated that because of the transverse focal shift, if both the semi-aperture angle and the phase distribution factor meet a certain requirement, the total field intensity pattern in the focus region can rotate clockwise in the propagation direction, while the intensity maxima will also rotate 180° from the negative half space to the positive half space. The result will provide a new way for controlling the field distribution in structured fields, which may be applied in optical tweezers.     

二维时延有序反向传播神经网络模型与算法

基于有序系统的概念,文中提出了一种二维时延有序反向传播神经网络模型并给出了相应的有序BP算法,同时指出传统的BP算法可看作是该算法的一种特例。该模型可用于模式识别、图像处理等领域。文中最后对5类飞机模型纵向像识别的实验比较,结果表明该模型及算法比传统的BP算法在性能上有一定的优越性。     

Al—Li合金的焊接性及其改进途径

本文对Ai-Li合金焊接性的研究现状作了扼要评述。重点是阐述商用Al-Li合金2090和8090焊接时发生的热裂纹敏感性,焊区气孔和接头力学性能等特性。文中对如何改善Al-Li合金焊接性的可能途径进行了讨论。     

一种全自动充放电机监测系统

介绍了 TDC—B型单片机全自动充、放电机监测系统。本系统由80 C 31单片机配接7109、5832,8279等芯片组成,能对105路信号进行巡检、显示、报警、打印等工作。     

0A0C 计算机病毒的分析、诊断与清除

本文分析了0A0C 计算机病毒的运行过程、传播机制和对系统的干扰破坏情况,给出了诊断和清除该病毒的方法。     

非线性平方和函数极小化的两种方法及其收敛性质

本文给出了求平方和函数极小化问题的两种改进方法,并讨论了它们的收敛性质,最后的数值例子也说明了算法是有效的.     

Fast frequency-sweep analysis of RF coils for MRI

A fast frequency-sweep technique is developed for the analysis of radio-frequency coils for magnetic resonance imaging. This technique applies the method of asymptotic waveform evaluation to the moment method solution of the integral equation for the original physical problem. Numerical examples show that the proposed technique can speed up the analysis by more than an order of magnitude.     

一种新的自适应子波预滤波器设计

基于一般的紧支撑尺度函数,本文设计了一咎单参数且具有良好逼近性能的新的自适应ＦＩＲ预滤波器,分析和模拟结果与表明这种预波滤算法具有较高的逼近精度和较快的逼近速度。