冷轧厂酸洗机组3号横剪大流量中高压液压系统设计方案探讨

在宝钢２０３０ｍｍ冷轧厂酸洗机组中，为了满足厚规格ＩＦ钢的生产，拟将原有的气动式剪切机改成液压式剪切机。为此，设计了一套中高压大流量的液压系统以满足３号横剪大剪切力（最高达７００ｋＮ）和快速剪切（３秒／次）的需要。由于采用了蓄能器增速回路和二通插装阀控制技术，使该液压系统较传统的剪切机液压系统具有响应速度快、体积小、重量轻、发热少和降低电机能耗等优点。     

An efficient hierarchicaltraversal algorithm for ray tracing

Ray tracing has been shown to be an excellent technique for rendering realistic images. However, it is important to reduce the lengthy computation time resulting from the brute-force nature of the original ray-tracing algorithms. In this paper, two ideas are proposed to speep up the well-known hierarchical subdivision method. First, a new hierarchy traversal scheme is described to reduce the number of raybounding volume intersection tests for secondary rays. Then, a plane-sweep method is proposed to make fewer intersection checks for eye rays. Experiments and discussions are presented to prove the feasibility of our methods.     

ⅡB型LBO光参量振荡器

二极管泵浦的Nd:YAG激光器美国加州圣克拉拉的Continuum公司推出的HPO-300型高功率二极管泵浦Nd:YAG激光器,在1064nm波长输出3mJ.该激光器重复率在1～300Hz可产生接近衍射极限的脉冲。     

无横梁高刚性轧机的结构分析

本文介绍了无横梁高刚性轧机的新颖结构，分析了该轧机高刚性及轴承长寿的原理。该轧机在现场使用中，取得了良好的效果。     

与国际综合业务数字网连接的京,沪,穗国际交换机工程

本文介绍了在新建的北京、上海、广州、国际交换机工程中采用新一代程控交换技术接通国际综合业务数字网，以及本工程采用的中继方式。     

On the capacity of packet reservation multiple access with capturein personal communication systems

A new Markovian model is developed to analyze the packet reservation multiple access (PRMA) protocol over Rician fading channels with lognormal shadowing. The packet dropping probability and the voice user capacity are defined as the performance measures. A new formula is derived to evaluate the dropping probability in the fading environment. The analytical results from our new formula show close agreement with those from computer simulations. The capture effect on the PRMA system performance is also studied. We found that, with capture, the user capacity will be improved and the service quality will degrade gracefully when the number of active users in the system increases. Using the dropping probability as the criterion, we also determine the optimal permission probability in a microcellular environment     

EFFECT OF HYDROGEN ON THE MICROSTRUCTURE OF SUPER-α2 ALLOY WITH β SOLUTION AND AGEING TREATMENT

借助透射电镜和Ｘ射线衍射仪探讨了氢对Ｓｕｐｅｒ－α２合金β固溶后时效组织的影响，结果表明，氢使时效组织显著细化，使析出相呈细小板条状规则排布，此外，氢还促进Ｂ２相转变为Ｏ相。     

智能电视,电话信息查询系统

本文阐述了在ＷＩＮＤＯＷＳ环境下开发电脑，电视、电话信息查询系统系统的基本思想、硬软件环境和具体实施方法，并介绍了软件流程。