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。     

鄯善油田天然裂缝性油藏地层参数及试井资料处理方法

针对鄯善油田具有天然裂缝的特征,运用了一个新颖的复合模型,分析其试井资料,求得近并裂缝延伸尺寸.流体流动参数及整个系统平均值等评价天然裂缝性油藏所需的几个基本参数.所得结果与鄯善油田开发生产实际相符合.因此,本文所探求的方法对天然裂缝性油(?)的动态监测及数值模拟预测具有一定的参考价值.     

客户／服务器型实时气象信息处理系统的设计与实现

实时气象信息处理在气象预报工作中具有重要意义,该系统为气象预报人员及时地提供各种气象数据,使气象预报人员准确地进行天气分析、预报以及各种气象图形、图象的显示和处理。本文介绍了系统的设计与实现思想,详细阐述了系统硬件配置、运行环境、实时气象信息接收和信息组织方式。     

弧焊电源动特性微机测试仪

本文介绍了一种由MCS-51系列单片机构成的数据采集系统以及用于电焊机动特性的测试软件。采用PP-40绘图打印机可打印出焊机动特性特征参数,并可描绘焊接电流、电压的动态波形。从而解决了《弧焊电源》课程实验和直流焊机动特性评定中存在的问题。     

数据压缩的功能字典方法

提出一种无损数据压缩字典方法，称为功能字典方法．该方法能较大程度上消除数据文件中多种形式的冗余，达到较好的压缩效果．     

七号信令测试分析仪数据链路功能级的软,硬件研制

作者以七号信令链路级及链路功能级的功能实现为主要讨论对象，提出了实现其功能的七号信令规程板的设计方案和思想。七号信令规程板是七号信号信令分析仪表的一个重要组成部分，因此对七号信号系统的链路功能级的硬件实现和软件实现进行了讨论，介绍了一种实现的方法。     

会计电算化教育存在的问题及其对策

考察我国目前会计电算化的现状．根据对会计电算化课程的教学实践，从师资、教学、目标、教材及教学软件四个方面揭示了会计电算化教育所存在的问题，提出了应采取的对策     

在Novell网络中实现对等数据通信

在Ｎｏｖｅｌｌ网络中，利用Ｎｅｔｗａｒｅ的ＩＰＸ协议实现对等数据通信，这种数据通信具有实时性好、可靠性高、效率高等优点．在数据通信设计中。设计了若干重要的数据结构和Ｃ语言程序．     

高电压设备绝缘在线监测数据采集的研究

提出了数据采集的系统方案，对数据采集器的计算机接口和模数转换电路进行了分析，通过采用高速光电隔离方法，有效抑制了计算机系统对模拟信号的干扰．简要给出了编程步骤．     

Spectral analysis of phylogenetic data

The spectral analysis of sequence and distance data is a new approach to phylogenetic analysis. For two-state character sequences, the character values at a given site split the set of taxa into two subsets, a bipartition of the taxa set. The vector which counts the relative numbers of each of these bipartitions over all sites is called a sequence spectrum. Applying a transformation called a Hadamard conjugation, the sequence spectrum is transformed to the conjugate spectrum. This conjugation corrects for unobserved changes in the data, independently from the choice of phylogenetic tree. For any given phylogenetic tree with edge weights (probabilities of state change), we define a corresponding tree spectrum. The selection of a weighted phylogenetic tree from the given sequence data is made by matching the conjugate spectrum with a tree spectrum. We develop an optimality selection procedure using a least squares best fit, to find the phylogenetic tree whose tree spectrum most closely matches the conjugate spectrum. An inferred sequence spectrum can be derived from the selected tree spectrum using the inverse Hadamard conjugation to allow a comparison with the original sequence spectrum. A possible adaptation for the analysis of four-state character sequences with unequal frequencies is considered. A corresponding spectral analysis for distance data is also introduced. These analyses are illustrated with biological examples for both distance and sequence data. Spectral analysis using the Fast Hadamard transform allows optimal trees to be found for at least 20 taxa and perhaps for up to 30 taxa. The development presented here is self contained, although some mathematical proofs available elsewhere have been omitted. The analysis of sequence data is based on methods reported earlier, but the terminology and the application to distance data are new.