基于DSP的变频调速系统与PC的通信软件设计

介绍了基于TS320F240DSP的变频调速系统与PC机的串行通信设计方法，阐述了Windows98环境下的多线程通信编程技术，并给出了VC＋＋6．0、DSP汇编语言写的主要程序段代码。     

新型瓦斯压缩机密封设计

结合长炼生产实际,分析了常用瓦斯压缩机机械密封存在的问题,利用波纹管的追随性和补偿能力,设计了三点一面式新型密封装置.在生产实践中,保障了低压瓦斯系统长周期运行,获得了可观的经济效益.     

ISE系列加入法的计算方法

本文为离子选择电极(ISE)四类系列加入法建立统一模型并编制应用程序,经实验考核,结果满意.     

MCS—51串行接口在煤矿监控监测系统中的应用

本文就MCS—51系列单片机串行接口在井下多机通信中的应用、设计思想和实施手段,提供了较为详细的软、硬件设计方法和技巧。     

一种工业控制串行通信网络

论述了一种用工业 PC,STD-PC 工控机异步串行通信口组成串行通信网络的方案。主要讨论了网络中信息包的组成,主从机的通信协议及信息包接收、发送的程序设计。     

Serial nuclear transfer improves the development of interspecies reconstructed giant panda (Aluropoda melanoleuca) embryos

Interspecies somatic nuclear transfer (NT) may provide a new approach for preservation of the endangered rare species. Previous interspecies cloning studies have shown that a nucleus from a quiescent somatic cell supports early development of reconstructed embryos in the ooplasm from another species. In this study, we transferred nonquiescent somatic cells from a giant panda into the perivitelline space of the enucleated rabbit oocytes. After electrofusion (at the rate of 71.6%) and electrical activation, 4.2% of the panda-rabbit reconstructed embryos developed to blastocyst in vitro. For improving the development rate of reconstructed embryos, we used serial NT in this study, i.e. blastomeres from reconstructed morulae were transferred into the perivitelline space of the enucleated rabbit oocytes. The fusion rates in the groups of serial I, serial II and serial III were 79.5%, 84.1% and 78.0%, respectively, having no difference with that of somatic group. And the blastocyst rates in serial NT groups were 19.4%, 13.5% and 10.3%, respectively, which are significantly higher than that in somatic NT group. These results indicate that the nuclei from nonquiescent somatic cells can support early development of reconstructed embryos and serial NT can improve the development rate of interspecies reconstructed embryos. These authors contributed equally to this work.     

VB.Net 2003中串行端口通信的实现

针对MSComm控件的不足,探讨在VB.Net2003中如何利用API函数来定义串行端口类,并通过一个应用实例介绍如何利用该类的声明来实现PC与可编程控制器之间的串行通信.这对开发高质量的串行通信有一定的应用和借鉴价值.     

An ERP study for the degrees of the difficulty in visual search

The present study mainly probed the relationships between ERP components and the degrees of difficulty in visual search. Three experimental and one controlled conditions were randomly selected. Results showed that the P1, N1, and P2 amplitudes and latencies had no significant differences among the three experimental and one controlled conditions, and the ERP waveforms of low perceptual load of visual search were different from that of high perceptual load. These results might indicate that the latencies and amplitudes of initial P1, N1 and P2 in high and low perceptual load conditions were almost the same. The ERP waveforms of parallel search were very different from that of serial search, and the ERP waveforms of serial search were very similar. The P3 amplitudes increased as the degrees of the difficulty in visual search decreased.     

PIC单片机在产品开发中程序设计的探讨

对PIC单片机在产品开发中的程序设计进行了分析,并详细讨论了PIC单片机程序计数器(PC)和串口中断数据接收处理程序的设计,对后者给出了部分程序和流程图.     

PLC远程控制通信程序的设计

计算机通过PPI协议与SIEMENS S7-200系列PLC串行通信不需要PLC方编写通信程序,不占用PLC的系统资源,读写PLC数据快速、可靠.基于此通信技术,用C Builder编写的通信串行程序在多个实际项目中得到了应用,效果良好.