辊式拉拔模用于连续拉拔机组的新技术

针对进口连续拉拔机组，独创设计了可配套使用的二连式辊模，并首次很好地解决了惯用模在辊模后的安装问题，是一种很有前途的新技术。     

Noise exposed of the operators of combine harvesters with and without a cab

A considerable number of the combine harvesters in Turkey are rather old and used without cabs resulting in unhealthy working conditions for their operators. Noise is one of the detrimental factors. This study deals with determining and comparing the noise exposed on the operators of the combines with and without a cab used for wheat harvesting in Turkey. The sound pressure levels (dB) at octave band center frequencies (31.5–8000 Hz) and the sound levels (dBA) at the ear level of the operators were measured on 37 different combine harvesters with four different makes and different years from 1976 to 2001. Fifteen of the combines were without a cab, another 15 had original cabs while remaining seven combines had cabs mounted on them after manufacturing.

The sound pressure levels were in a decreasing trend from the lower frequencies to higher frequencies. This trend was more noticeable for the combines with original cab and with the cab mounted after manufacturing compared to the ones without cab. The use of a cab was more effective in the insulation of the noise at the medium and higher frequencies, which have more bothersome effect compared to the lower frequencies. The sound pressure levels were 75–102 dB and 46–89 dB at low (31.5–500 Hz) and high (500–8000 Hz) frequencies for all combines, respectively. The sound pressure levels at the frequency of 4000 Hz at which the human ear is most sensitive were 6–17 dB lower for the combines with the cabs mounted after manufacturing and 9–28 dB lower for the ones with the original cabs compared to the combines without cab. The sound levels were 85–90, 81–83, and 76–81 dBA for the combines without cab, with cab mounted after manufacturing, and with original cab, respectively.

The study showed that the use of a cab was useful in the insulation of the noise, particularly at higher frequencies. In addition, it protects the operator from the factors having detrimental effects on the working efficiency such as high temperature and dusty environment. The authors strongly recommend mounting of a cab on to the combines currently being used without a cab in rental system in Turkey to provide healthy working conditions for their operators.     

视频会议中的多画面码流合成的研究与实现*

H.323视频会议系统中的多点控制单元(MCU)能在多点会议中提供音频、视频和数据流的集中处理。针对视频信息的处理需求,提出了一种实用的多画面码流合成策略,它具有计算复杂度低、处理速度快、延时小、不改变原有画面质量等特点。     

相关瑞利衰落信道MRC接收性能分析

通过一种一般性方法研究两种天线设置时相关瑞利衰落信道上MRC接收的BPSK性能，并利用衰落信道上数字信号传输的归一化性能研究结果，分析MRC接收的MQAM的性能，给出平均比特差错率的解析表达式。     

仿真利器Matlab6的混合编程

该文从Malab6的ActiveX接口出发，深入讨论了利用Matlab6进行混合编程的思路及详细的实现方案与实现难点，尤其是针对Matlab6编程出现的新问题。混合编程具有很强的实践性与可操作性，为工程技术与科研工作人员提供了有效借鉴。     

加强农业综合开发工作服务垦区社会主义新农村建设——谈农业综合开发与新农村建设的结合

农业综合开发与新农村建设都是中国农村工作的重要组成部分,但两者可相互促进,相互补充.在新农村建设中应充分发挥农业综合开发的推动作用,同时,通过农业综合开发的制度创新,加快新农村建设步伐.     

构建基于微证书的物联网密码认证系统

针对物联网环境中传感节点运算能力弱,存储空间有限的特点,本文研究和设计了基于微证书的物联网密码认证系统,通过使用微证书技术来提高系统的认证,数据完整性验征以及加解密数据的速度和安全性。基丁微证书的密码认证系统,主要采用组合对称密钥技术和安全芯片技术,实现微证书的一次一变的动态特征以及硬件芯片的安全存储,町以满足夫规模的感知设备认证、签名以及加解密等物联网安全需求,提高物联网的安全性能。     

基于Motion的升降割台仿真分析与优化设计

对4LB-0.6半喂入水稻联合收割机升降割台进行了研究设计。首先确定了割台传动系统方案,并确定了曲柄转速、横向输送链速等主要设计参数,然后对割台升降机构进行了设计,确定了升降方案,并初步设计了机构尺寸。通过Solidworks Motion软件进行了动态仿真分析,获取了割刀速度、横向输送链速度,对割台传动系统进行了验证分析。最后通过Motion设计算例对升降机构进行了优化设计,得出不发生干涉、收割机行走通过性好、电动推杆功率最小情况下最优设计尺寸,缩短了收割机纵向尺寸。     

材料成型与控制技术专业352工学结合人才培养模式创新

陕西工业职业技术学院材料成型与控制专业积极响应教育部"工学结合"高职人才培养模式改革的号召,通过与行业企业合作,定位专业人才培养目标、开发基于工作过程系统化的课程体系及专业核心课程、实行顶岗实习等教学改革,形成了本专业独特的全真载体、实境训能的"352"工学结合人才培养模式,提高了教学质量和人才培养的效果.     

整合技术在系统架构上的应用——利用Windows XP轻松实现Internet上的远程控制详解

在计算机产业的快速发展下,许多的实际应用很难用单一的技术就能实现。要使应用系统达到用户的多种需求(如应用需求,安全需求,资金需求),工程师们经常通过多种技术的综合应用来满足需求。这种综合,为整合。这里,我们以解决Internert上的远程控制问题为例说明。