基于ADuC841的数据采集系统的设计

针对油田现场环境复杂,一直面临着因采集到的数据不准确的问题,采用ADI公司的ADuC841芯片设计了一种具有在油田现场实现数据采集的小型电路。该数据采集电路采用片内集成的A/D转换器,大大减小电路体积;满足系统的高温、高压工作环境以及低功耗。现在的数据采集系统速度更快,功能更强,精度更高,但是体积却显得更小,总体性价比越来越高。     

基于ADuC812的电源监控系统

基于ADuC812的电源监控系统,分为信号检测和放大处理、A/D转换、键盘输入和显示、报警保护、通信和单片机系统模块等部分.主程序完成对系统的总体调度和功能的管理.数据显示、键盘输入、电压电流采样及通信则放入相应中断处理程序.系统采取电源与被测源隔离、合理布线、加防护壳等多种措施并用以抗干扰.     

基于LabWindows/CVI和Matlab平台的温度控制系统设计与实现

采用PCL-812PG多功能采集卡,建立了虚拟仪表下的温度模糊控制系统,实现了模糊表和模糊规则的可视化.介绍了控制系统的硬件结构和软件设计方法,尤其是LabWindows/CVI与Matlab的软件接口方法,给出了基于Matlab模糊逻辑工具箱的模糊控制设计方案.最终的控制结果表明,设计的系统能满足设备实时控制要求.     

基于ADuC812的温湿度测量控制系统

文中介绍了ADuC812为核心的温湿度测控系统的原理，并给出了硬件电路和软件编程的设计方法。     

基于ADuC812的在系统可编程数据采集电路的设计

介绍了一种采用ADuC812单片机芯片设计的具有在系统可编程能力的数据采集电路。该电路不仅可以方便地在应用现场对系统进行升级而且在设计调试阶段不需要专用硬件开发设备和编程设备的支持。     

基于ADuC812单片机的堵漏材料评价系统设计

本文首先介绍了堵漏材料评价系统的仪器结构和原理．着重介绍了温度控制电路设计及软件设计．给出了温度控制的方法．     

A new framework for identifying differentially expressed genes

Microarrays have been widely used to classify cancer samples and discover the biological types, for example tumor versus normal phenotypes in cancer research. One of the challenging scientific tasks in the post-genomic epoch is how to identify a subset of differentially expressed genes from thousands of genes in microarray data which will enable us to understand the underlying molecular mechanisms of diseases, accurately diagnosing diseases and identifying novel therapeutic targets. In this paper, we propose a new framework for identifying differentially expressed genes. In the proposed framework, genes are ranked according to their residuals. The performance of the framework is assessed through applying it to several public microarray data. Experimental results show that the proposed method gives more robust and accurate rank than other statistical test methods, such as t-test, Wilcoxon rank sum test and KS-test. Another novelty of the method is that we design an algorithm for selecting a small subset of genes that show significant variation in expression (“outlier” genes). The number of genes in the small subset can be controlled via an alterable window of confidence level. In addition, the results of the proposed method can be visualized. By observing the residual plot, we can easily find genes that show significant variation in two groups of samples and learn the degrees of differential expression of genes. Through a comparison study, we found several “outlier” genes which had been verified in previous biological experiments while they were either not identified by other methods or had lower ranks in standard statistical tests.     

便携式温湿度环境试验箱校准仪的研制

针对现有温湿度环境试验箱校准方法复杂、操作不便的现状,研制了一种便携式、智能化校准仪,详细介绍了校准仪的构成、测量原理等。该校准仪充分利用ADuC834集成的模拟信号采集功能,使硬件电路得到简化;经ADuC834内部软件计算,可直接读取温湿度值并将数据传输到计算机,方便检定校准工作。对整机进行测试,结果表明温度测量误差≤±0.1℃,湿度测量误差≤±3%RH,符合实际需求,并提高了工作效率。     

高功率因数串级调速系统触发器设计

普通串级调速功率因数低，影响了该技术的推广。本文介绍的数字化的触发器及与之配合的主回路能提高串级调速系统的功率因数。本文重点介绍了怎样以ADuC812为核心构成这种高功率因数串级调速系统触发器的硬件电路以及如何进行相应的软件设计。     

基于PCL-812PG数据采集卡的变压器试验系统设计

分析了用计算机来完成变压器试验的测试系统,该系统由计算机、PCL-821PG数据采集卡、变送器等组成,可以完成变压器的空载、短路和温升等实验,提出了系统的软、硬件的实现方法.实验数据能自动生成、存档和打印,提高了试验的精确度和效率.