8B10B编解码器在PCI Express总线中的实现

本文在深入研究8B10B编、解码原理的基础上,利用其DWS特性,用Verilog HDL语言实现编、解码算法的描述,并通了modelsim仿真.在ISE9.1i平台上综合后下载到FPGA上实现具体的硬件电路,同时分析了系统各项性能.在PCI Express总线上,实现了一个性能良好的8810B编解码系统,它具有很好的可移植性以及一定的实用价值.     

葡萄酒中铁和锌含量的测定

本实验研究了用双波长分光光度法以锌试剂为显色剂,同时测定葡萄酒中的微量元素铁和锌,铁离子的检出限为0～20μg／25 ml,锌离子的检出限为0～30μg／25 ml。本法简便易行,结果可靠,能够同时测定葡萄酒生产中铁离子和锌离子的含量,为葡萄酒生产的质量控制和储存期对品质的影响提供一种途径。     

软件无线电中直接波形合成的研究

直接数字频率合成（DDS）是一种新型的频率合成技术。介绍了如何利用DDS技术来产生调频波形及其他的数字调制波形;阐述了一种新的适合于软件无线电实现的算法,即采用预先计算后存贮在贮存器中的波形来代替实时运算,直接合成数字调制波形（DWS）;研究了一种压缩查找表的方法。此外,还对此算法在实现过程中遇到的截断误差、运算量和存贮量的问题进行了探讨。对于所提及的算法,给出了仿真结果。     

数字车间系统中机床管理模块设计

介绍了一个有自主知识产权的数字车间系统(DWS),它提供了企业车间设计和漫游功能;提出了其机床管理模块设计框架,介绍了其后台管理,以及普通机床管理模块;最后用该系统构建了一个车间模型,验证了该机床管理模块可快速简单辅助车间设计.     

研究蛋白质凝聚凝胶的技术进展

由于蛋白质形成的凝胶会影响食品的质构和品质,所以研究蛋白质凝胶对于食品科学有极其重要的意义.然而,蛋白质形成凝胶的机理过于复杂,需要更先进的技术来研究.介绍了用于蛋白质凝胶研究的最新技术进展,如原子力显微镜(AFM),共聚焦激光显微镜(CSLM)和漫射波光谱(DWS).与传统研究凝胶的方法如动态流变仪和扫描电子显微镜(SEM)相比,这些新方法简化了样品的预处理,有实现在线测定的可能.由于样品处于天然状态,所以反映的信息更具有真实性,加上高分辨率,可以实现蛋白形成凝胶过程分子水平的可视化.因此,采用以上的新技术可以为研究蛋白凝胶的形成提供更多的信息.     

数字车间系统中夹具子系统的设计

数字车间系统提供一个数字环境使企业能快速进行可视化车间设计,并验证和优化其方案,因此可带来巨大的效益.本文介绍了一个数字车间系统;提出了其夹具子系统设计框架,详细设计了其中的组合夹具管理模块,并阐述了该系统的关键技术;最后用该系统构建了一个钻孔工序的装备模型,从而验证了该夹具系统可快速简单地辅助车间设计.     

Fundamental research on machining performance of diamond wire sawing and diamond wire electrical discharge sawing quartz glass

In reciprocating diamond wire sawing of quartz glass, the reversing and acceleration and deceleration will cause the position change of diamond wire, resulting in the discontinuous wire sawing in the reversing stage, so as to leave residual material on the processing surface and form wire marks. Also, the cutting load will cause diamond wire deformation as bow shape, and affect the machining accuracy. In this paper, the evaluation of DWS machining performance of quartz glass focus on the sawing time, cutting force and vibration, wire tension, machining surface flatness and roughness, surface morphology and wire state. The theoretical analysis of wire mark was carried out, and the simplified wire bow model of quartz glass sawing was established. The existence of wire mark and wire bow were verified by detecting the 3D contour of the slice. In addition, a diamond wire electrical discharge sawing (DWEDS) was performed to find the differences to DWS in the above indicators. Experiments were presented in jet cooling and bath cooling conditions. It was found that the cutting force, vibration, and wire tension of DWEDS are more stable than that of DWS. The DWEDS has been proved helpful to improve machining performance of quartz glass from surface roughness, sawing time, processing state, and wire bow control as it reduces the macro cutting force acting on the diamond wire although the discharge effect is weak. The SEM of slice surface and diamond wire showed no significant difference between DWEDS and DWS. Also, the influence of feed speed and cooling methods on machining performance was investigated.     

PWT全自动管道焊接DWS.03软件系统

由于管道全位置自动焊接时焊接位置不断变化,焊接自动化难度较高,针对管道自动焊接的特殊性和复杂性,以国外先进的PWT最新的DWS.03焊接系统为研究对象,PWT能从外部焊接从打底到填充的整个焊缝,特别先进的是外部进行根焊。介绍了管道外焊接打底到盖面的焊接工艺,详细分析软件系统如何通过程序设置,实现管道焊接自动化控制。在研究过程中发现该焊接系统能自动焊接高品质环焊缝,但是系统还是可以从焊枪角度和驻留时间不对称设置进行升级,进一步提高外焊机的适用范围。     

基于内容的分布式Web服务器调度算法

在分布式Web服务系统的研究中,基于内容的调度策略日益受到关注.但是,基于内容的请求调度带来的额外开销使得调度节点成为系统的瓶颈,限制了系统规模.为了实现系统的容错和扩展,集中讨论了分布式调度策略的设计问题,并针对难于分布的面向缓存调度策略设计了相应的分布式调度算法DWARD(distributed workload-aware request distribution).基于LINUX IP协议栈的系统测试表明,DWARD算法可以在适当调整的情况下获得良好的性能.     

Recidivist drink drivers’ self-reported reasons for driving whilst unlicensed—A qualitative analysis

Aim

This paper presents qualitative data from an in-depth interview study of 40 repeat drink drivers in Perth Western Australia to inform countermeasures for these high risk offenders.

Background

Licence sanctions are effective countermeasures for most drink drivers but the small group of repeat offenders are less responsive. Many choose to drive whilst unlicensed as the probability of detection is low and the social and economic costs of not driving can be high. This undermines other drink drive countermeasures.

Results

Most respondents who had had their licence suspended admitted to driving whilst under suspension. Employment and social factors were key themes emerging in respondents’ accounts of driving whilst under licence suspension.

Conclusions

Whilst a range of enforcement countermeasures are needed to deter drunk and unlicensed driving, this study suggests that where possible we aim to keep offenders within the system that consists of formal laws and informal social controls, rather than apply penalties in ways that undermine adherence to the law by increasing unlicensed driving. Allowing for interlock installation early in the driving suspension period, and allowing fines to offset cost of interlock installation and monitoring, may maximise community benefit and reduce unlicensed driving.