C504微控制器在无传感器的BLDC电机控制中的应用

论述了利用C504输入捕捉/输出比较单元(CCU)控制无传感器的BLDC电机的原理及其硬件实现和软件结构     

基于BPR技术的纱线张力信号去噪研究

讨论了纱线拉伸张力信号的平滑算法。三阶平滑B-样条函数插值算法应用于低信噪比的纱线张力信号滤波取得了良好滤波效果,纱线断裂点校正（BPR）算法使被延时的纱线断裂点位置得到了校正。平滑算法使本文的试验样品纱线张力信号的信噪比（SNR）从21dB提高到45dB。平滑B-样条函数插值将离散信号转换成B-样条空间的连续信号（离散的B-样条函数系数代表的连续信号）。基于这种连续信号的计算使得张力结果更为精确。     

基于快速小波变换的信号分析系统

介绍了小波分析中的快速小波变换算法,通过与常用小波基相对应的正交镜像滤波器组,实现了信号的快速小波分解和重构。结合虚拟仪器技术,研制成功虚拟式快速小波变换信号分析系统。经由该系统分析的动态信号,即可看到信号的概貌,又可看到信号的细节,特别能捕获到反映设备重要故障特征的奇异信号以及提纯被噪声污染的信号。     

Modelling Experiments as Mediating Models

Syntactic and structural models specify relationships between their constituents but cannot show what outcomes their interaction would produce over time in the world. Simulation consists in iterating the states of a model, so as to produce behaviour over a period of simulated time. Iteration enables us to trace the implications and outcomes of inference rules and other assumptions implemented in the models that make up a theory. We apply this method to experiments which we treat as models of the particular aspects of reality they are designed to investigate. Scientific experiments are constantly designed and re-designed in the context of implementation and use. They mediate between theoretical understanding and the practicalities of engaging with the empirical and social world. In order to model experiments we need to identify and represent features that all experiments have in common. We treat these features as parameters of a general model of experiment so that by varying these parameters different types of experiment can be modelled.

超混沌时序加密数字信号的应用

给出一个超混沌系统模型,利用此系统生成的超混沌时序作为密钥,采用模２加法的方式对数字信号进行重新编码,实现了对文本、图像和声音等数字信号的加密与解密。     

自适应通信环境(ACE)及其用于构建异构网络计算环境

自适应通信环境(ACE)是一个实现了并发通信软件的核心设计模式的、免费的、开放源代码的、面向对象软件框架.自适应通信环境(ACE)提供了丰富的完成公共通信功能的、可重用c++类包和框架组件,它可以运行于众多的平台.该文比较全面地介绍了自适应通信环境(ACE)的结构和功能及安装.接着构建了一个用于实验的实用而低价位的异构网络计算环境.     

无失真传输和希尔伯特变换

本文利用希尔伯特变换的概念及因果系统H（jω）的实部与虚部之间的关系来分析通信系统的无失真传输．     

专用短程通信协议模型的建立

以专用短程通信(DSRC)协议的开发为背景,参照现有国际标准,提出了适合我国通信环境和面向多应用的DSRC协议的总体结构,描述了协议的帧格式,论述了车-路的通信过程,在此基础上建立了协议的数学模型,并给出了模型的假设条件和部分在求解过程中将要用到的基础数据．     

科技查新实践中的技巧

本文系统的从查新合同的填写，查新员与委托人的沟通，检索式的拟定三个方面入手，分析查新基本流程中常见的问题，探讨相应的解决措施和工作技巧．以提高查新效率和质量。     

The simulation of electrostatic coupling intra body communication based on the finite element method

In this paper, investigation has been done in the computer simulation of the electrostatic coupling IBC by using the developed finite-element models, in which a.the incidence and reflection of electronic signal in the upper arm model were analyzed by using the theory of electromagnetic wave;b.the finite-element models of electrostatic coupling IBC were developed by using the electromagnetic analysis package of ANSYS software;c.the signal attenuation of electrostatic coupling IBC were simulated under the conditions of different signal frequencies, electrodes directions, electrodes sizes and transmission distances. Finally, some important conclusions are deduced on the basis of simulation results.