Complex display behaviour during the intraspecific interactions of myrmecomorphic jumping spiders (Araneae,Salticidae)

Jumping spiders (Salticidae) are known for their elaborate vision‐based display behaviour, and a sizeable minority of the species in this large family resemble ants. The display repertoire of two ant‐like salticid species from the Philippines is investigated. Myrmarachne assimilis is a specialist ant mimic, closely matching the appearance of the weaver ant Oecophylla smaragdina. Myrmarachne bakeri is a generalist mimic, which, although ant‐like, is not a close match to any sympatric ant species. Myrmarachne are sexually dimorphic, with males having enlarged chelicerae. The copulatory posture of Myrmarachne is unique among salticids, apparently as an adjustment for the male's elongated chelicerae. Details concerning the intraspecific behaviour of Myrmarachne appear to be adjustments to living in environments populated by numerous other animals with similar appearance (ants). However, the specialist and the generalist that were investigated have display repertoires that are broadly similar to each other and to those of more typical salticids. Generally, the display behaviour of Myrmarachne appears not to have necessitated dramatic deviation from typical salticid display and mating strategies.     

从技术标准竞争影响因素看我国通信产业TD-SCDMA标准推广策略

标准的确立对于一个国家或地区的经济发展、产业优化乃至国家和地区的安全具有重要意义,但标准的实施及推广受到诸多因素的影响。在分析技术标准竞争的主要影响因素的基础上,探讨了我国的3G标准国际化竞争所面临的有利条件和不利因素,由此提出了我国TD-SCDMA标准推广实施策略。     

大众传播对产品的评价标准的影响

本文从产品的评价标准的基本涵义和重要性入手,运用传播学和设计艺术学的相关理论,就大众传播对人们意识形态的教养作用以及大众传播中常用的消费偶像的现象进行分析,探讨了大众传播对于消费文化的形成的作用——将物品转化为符号,从而提出：大众传播挑起了消费者对产品占有和展示的欲望,帮助消费者不断更新产品形象的审美标准。     

能量无限的信号的小波分析方法

利用连续小波变换研究了能量为无限的信号的谱分析，引进了时－频功率谱的概念，并研究了时－频功率谱与经典的功率谱及平均功率的关系；还引进了自相关函数的小波变换，且研究了它与时－频功率谱之间的关系。     

数字式GPS信号适配器

采用数学信号的多抽样率处理技术，设计了ＧＰＳ信号适配器．这一系统具有精确的线性相位特性，可保证ＧＰＳ信号的频谱结构不发生畸变．较详细地论述了系统的组成，工作原理及实现方法．所述的信号处理方法可用于类似的其它场合．本信号适配器是“Ｓ波段ＧＰＳ接收机”中的一个组成部分．     

Controlled analogue experiments on propagation of seismic electromagnetic signals

This study presented a method of laboratory analogue experiments based on a geographical scaling model and a waveguide model to investigate the characteristics of the propagation of seismic electromagnetic signals in the crust and the atmosphere. Some controlled experiments were done to evaluate the possible influence on the experimental results from the background electromagnetic field, geographical conditions, boundary effects, the source of electromagnetic signals （position, magnitude, and frequency）, and media conductivity. The reliability and the extensibility of the above analogue experimental method were also investigated. This study indicated that such kind of analogue experimental method provided an intuitionistic way of studying the propagation of seismic electromagnetic signals, which is one of the most difficult research topics in seismo-electromagnetism.     

直接序列扩频信号快速捕获

提出一种新的基于频域并行搜捕法的改进型快捕电路结构.该结构利用设计复用技术实现FFT单元和IFFT单元的复用;通过软件计算本地伪码FFT,并将其结果存储在ROM中,使硬件规模大幅减少;采用并行设计提高系统的运算速度;采用块浮点算法提高动态范围和运算精度.整个快捕电路由一块FPGA XC2V3000-5实现,工作时钟为29 ns,精度为1/4码片情况下,伪码捕获仅需4.145 ms.仿真和测试结果验证了设计的正确性.     

如何配置局域网中的通信协议

基于局域网环境，以Windows NT为主，同时兼顾NetWare与Windows95／98等操作系统，介绍和分析了常用通信协议(NetBEUI协议、IPX／SPX及其兼容协议和TCP／IP)协议)的特点、性能和必要的配置方法。     

一种视频数据错误的自适应处理方法

视频通信中信号的误码、数据的丢失可引起视频图像质量下降、甚至无法解码,必须进行数据恢复、错误掩盖.在分析各种数据错误处理方法的基础上,结合数据传输中各参数对数据恢复的影响,提出了一种自适应错误处理方法:根据视频图像的运动情况及其编码类型,自适应、动态地选择某种错误隐藏技术或它们的加权组合,从而达到最好的错误隐藏效果.通过PSNR图分析和图像主观质量表明该方法行之有效.     

高速折叠式包装机送纸长度微机测控系统的研究

根据高速折叠式包装机送纸系统送纸长度精确定位和纸长伸缩误差补偿的要求,提出了一种微机测控方法,并给出了机械装置和电路软硬件的设计框图．