基于Labview的多通道数据采集系统设计

围绕多通道数据采集系统,提出了基于Labview的多通道数据采集系统设计,该采集系统主要由硬件系统和Labview软件系统组成。硬件系统主要介绍了调理电路与数据采集卡选型;软件系统重点介绍了数据采集、滤波与存储,通道波形回放,模拟信号输出三个模块的Labview程序设计。所设计的系统能够为各种现场的多通道数据采集系统提供一定的指导作用与实践参考。     

基于虚拟仪器技术的多通道压力监测系统

本文是在虚拟仪器技术的基础上对多通道压力监测系统进行了设计，该监测系统包括四个功能模块：即数据采集模块、分析处理模块、数据存储与数据回放模块。该系统可实现实时多通道数据采集、存储、显示与分析处理。     

基于虚拟仪器的多通道数据采集分析系统

本系统以数据采集卡和PC机为主要硬件,构建了基于的多通道数据采集和分析系统,设计了人机界面。该系统结构简单、抗干扰性强、实时性好,具有较高的稳定性和可靠度。     

基于PXI和LabVIEW的双板卡远程数据采集系统设计

介绍了一种基于PXI总线及LabVIEW平台的数据采集系统设计方法,该系统可实现双板卡协同工作下的多通道数据采集,并通过TCP技术实现远程数据传送,并能够进行数据的存储和回放。该系统已成功应用于转子实验台动平衡的测试工作。     

高速数据采集器的设计与应用

主要介绍应用多通道通信技术开发研制的调整数据采集器的功能特点，对实际研制和使用中的几个关键技术进行了较详细的分析讨论。应用于流场测试的结果表明，该系统速度快，稳定性好，功能齐全且自动化程度高，该系统具有的高精度非常适合于流场测试，能确保测试的准确性。     

基于MAX125的多通道同步采样数据采集系统

介绍了一种基于MAX125的多通道同步采样数据采集系统.该系统由89C51单片机作为控制核心完成控制功能.文中较详细地介绍了本系统的硬件电路设计和软件设计方法.     

多通道无纸记录仪的研制和开发

介绍一种多通道无纸记录仪的研制和开发。该系统采用虚拟仪器技术，有高数据采集率及数据回放率、原始数据后备、数据曲线分析处理等功能，适用于化工、制药、电力、冶金等行业的温度、压力、流量等数据的显示和记录。     

一种高性价比A/D、D/A转换电路的实现

介绍了一种用于小型飞行器数据采集和信号处理系统的多通道A／D、D／A转换电路；并采用性价比较高的ADC、DAC芯片，给出了电路设计和详细工作过程．针对小型飞行器电磁环复杂的情况，采用了新的设计方案，提高了电路的转换精度和系统的可靠性；在电路板设计中采用了适当的措施，增强了电路的抗干扰能力．实验证明，该电路能够满足飞行器系统要求．     

基于PCI总线的数据采集卡设计

高速数据采集是雷达采集系统的关键部分,利用PCI总线的高速传输特性,给出了一种设计方法.介绍以Xilinx公司的CPLD芯片XC95144XL控制模块和总线接口芯片PLX9054为核心的多通道数据采集卡的设计,包括原理设计、芯片选择、PCB制作等.通过在探地雷达探测地下矿产资源中对数据采集卡的测试分析,证明该采集系统能够满足探地雷达中高速数据传输和处理的实时性的要求.     

多通道卫星导航探空接收机射频前端的设计与仿真

结合卫星导航探空系统的发展需要，为实现卫星导航探空系统实时跟踪多个探空仪，使用EDA软件设计对多通道卫星导航探空接收机射频(RF)前端进行仿真。内容包括功率分配器、低噪声放大器和滤波器3种元器件与射频链路的级联仿真。信号经功率分配器变为多通道信号，不同通道使用不同解码方式可实现同时跟踪多个目标。仿真结果表明，方案可实现良好的物理多通道效果，解决了射频放大器芯片阻抗不匹配问题，实现了2.5%带宽超窄带滤波。     

Ecriture,Recherche et Pédagogie

Résumé Cet essai évoque les contextes pédagogiques de l'écriture au-delà des formes d'écriture convenues en recherche, et questionne les usages scolaires de l'écriture. J'y suggère d'autres usages inspirés d'une approche qui inverse les rapports usuels entre communication et représentation, entre kinésis et mimésis. Cette approche vise une démystification du pouvoir de l'écriture à représenter le réel, à dominer la communication, et une promotion d'une écriture expressive et métaphorique, favorisant l'appropriation de cette technologie virtuellement libérante.Université Laval     

教你正确用(二十二)

Mother's Day--母亲节 Mother's Day falls on the second Sunday in May every year. This is the occasion we show appreciation to our mothers and to people who have worked so hard to take care of us. Today, I'm sharing thoughts from a friend about mother, love,and the study of English. When we were young students, a teacher touched our heart,and we all miss her very much on this special day in May.     

汉字倒说

汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。     

找到心仪工作,只需六招

Whether your preferred destination is the executive suite or simply the nearest exit from your current position, don't let your job take you aimlessly down any path. In fact when it comes to career planning, don't think in terms of "jobs" at all, says corporate transitions expert William Bridges, Ph.D. Instead he suggests building your career plan on "doing the work you're best at for the employers who need it."     

钱生钱!

我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了     

Inequalities for inscribed simplexes

The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex.     

微薄的薪水,高尚的情操

现在,我们可以没有面包,没有钱,没有房子,没有车子……但我们唯独不能丢失的是高尚的情操,笃定的信念,还有,满满的希望!     

Virtual reality approach for 3D large model browsing on web site

Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching.     

An Analysis of Individualism in the Declaration of Independence

The awareness of individualism can be traced back to the period of American Revolution when the Declaration of Independence was produced.It expressed basic beliefs concerning freedom,equality,democracy,privacy and the relationship between people and government,which were exactly what the philosophy of individualism mostly dealt with at that time.This paper is to exploit the essence of individualism by analyzing the Declaration .The analysis enables us to reconsider its significance to the issue of America human rights and foreign policies.     

Pragmatic Analysis of Personal Pronouns in Public Speech

Public speaking, as one kind of speech act, the speaker uses some pragmatic strategies, for example,the use of personal pronoun, in order to achieve effective communication. Speakers use the first personal pro-noun we and the second personal pronoun you conventionally, also there are some deviations in the use of person-al pronouns. However, theses kinds of uses have to be explained and understood in such a specific context.