微生物批式流加发酵脉冲系统的参数辨识及稳定性

针对微生物批式流加发酵生产1,3-丙二醇的非线性脉冲系统,建立敏感参数的优化辨识模型(PDP),论述了模型解的性质、解与参量的关系以及辨识问题最优解的存在性.通过构造算法求得辨识问题最优解,并讨论了新参数下脉冲系统解的稳定性.     

Banach空间中N阶脉冲积分-微分方程边值问题的解

运用Monch不动点定理，获得了Banach空间中一类N阶非线性混合型脉冲积分-微分方程边值问题解的存在性．最后给出一个三阶无穷脉冲积分-微分方程边值问题的例子来说明文中所给的条件是合理的．     

一种半导体脉冲激光信号源的设计方法

介绍一种易于实现的操作信号源的设计方法，并对光学结构设计，机械设计和控制电路设计进行详细说明。     

S1240长途交换设备产生短话单原因分析及处理方法

本文主要阐述S1240长途交换设备产生长途超短话单原因，并从多个方面进行分析，希望引起相关设备维护人员注意，减少超短话单产生。并总结作者日常处理短话单经验，供大家参考。     

Laser-induced Alignment and Coulomb Explosion of CO2

Dynamic processes of CO2 are experimentally studied in intense femtosecond laser fields with laser intensity varying from 1×10^13 W/cm^2 to 6×10^14 W/cm^2. When the laser intensity is below the ionization threshold, a coherent rotational wave-packet is formed for CO2 at room temperature through nonadiabatic rotational excitation. The evolution of the wave-packet leads to transient alignment. The field-free alignment revives periodically after the laser pulse is over. The revival structure can be modified by a second laser pulse for the rotational wave-packet through precisely adjusting the time delays between the two laser pulses. When the laser intensity excesses the ionization threshold, ionization and Coulomb explosion occur. The atomic ions C^m＋ （re=1-3） and On＋ （n=1-3） observed in the experiment exhibit highly anisotropic angular distributions relative to the laser polarization. Using two linearly polarized laser pulses with crossed polarization, we conclude that the anisotropic angular distribution results from dynamic alignment, in which the rising edge of the laser pulse aligns the neutral CO2 along the laser polarization direction prior to ionization.     

安捷伦推出脉冲函数任意噪声发生器

安捷伦科技推出一款精确测试设备脉冲函数任意噪声发生器Agilent 81150A，在任何频率都具有8 ps rms的固有抖动。具有13个标准函数，高达10 MHZ的调制能力，可进行80多种测量；81150A脉冲函数任意噪声发生器可为进行脉冲生成和噪声生成的强化测试提供通用波形。它采用的一体化设计可以大限度减少电缆、空间和测试时同。差分输出和用于一流设备的高压放大器。www．agilent．com