低气压下长间隙工频放电试验平台研究

为研究极高海拔低气压下工频放电特性,搭建了包括真空试验腔、真空泵、真空计、工频电源、高速摄像机等仪器的低气压长间隙工频放电试验平台,并对其气密性和放电性能进行测试。该平台可实现23 Pa~100 k Pa范围内气压调节和600mm以内放电间隙调节。测试结果表明:试验平台能够模拟海拔20 km以上的长间隙工频放电,且对于试验周期较短的工频放电特性研究具有良好的气密性和放电性能。研究成果对高海拔低气压下长间隙放电特性研究具有重要参考价值。     

一种快速检测反应堆大厅密封性能的方法

发展了一种检验反应堆大厅密封性能的新的实验方法——正压试验法;该方法操作简便、快捷、直观,利用反应堆大厅原有的通风系统就可以很容易地实现,不仅在短至几分钟的时间内即可获得反应堆大厅在有超压和无超压两种情况下的气体泄漏率,还能直观地检查和发现漏点,以便于进行有效封堵。介绍正压试验法的实验原理,以及用此法检查两个临界实验装置大厅密封性能的实验结果。与传统的SF_6扩散法实验测量的气体泄漏率结果相比较,证明正压试验法的实验结果是可信的。     

IPv6协议栈性能分析

对常用操作系统支持的IPv6协议栈进行了实验研究,并与IPv4协议栈进行了量化对比分析.实验结果表明,Linux的IPv6协议栈的性能远远好于Windows XP的IPv6协议栈性能.     

ORGANIZATIONAL LEARNING AND VENDOR SUPPORT QUALITY BY THE USAGE OF APPLICATION SOFTWARE PACKAGES： A STUDY OF ASIAN ENTREPRENEURS

In this paper we study how organizational learning impacts organizational behavior, and howvendor support quality enhances product adoption and usage behavior.These constructs were verifiedusing Application Software Packages(ASP)-a prewritten, precoded, commercially available set ofprograms that eliminates the need for individuals or organizations to write their own softwareprograms for certain functions. The relationship between ASP usage, usage outcomes and useprocesses were also investigated. Two hundred and ninety-five Chinese, Indian, and Malayentrepreneurships were studied. It was found that usage outcome strongly determines usage, while useprocess has only an indirect relationship (via outcome) on usage. The impact of organizational learningand vendor service quality on usage, usage outcome, and use process were robust. Theoretical andpractical implications of the research are discussed.     

探究分析纳米金属材料计算机模拟研究进展

随着科技的快速发展,纳米金属材料在新材料的研究领域中已经越来越引起人们的重视,现在在很多领域也有着极其广泛的应用.下文将对计算机模拟在纳米金属材料研究的历程,以及它在微观结构、内在机制以及性能方面的研究进展做一个简单的阐述,希望能对我国纳米技术今后的应用提供借鉴和指导.     

In vitro and in vivo studies on biodegradable magnesium alloy

The microstructure, mechanical property, electrochemical behavior and biocompatibility of magnesium alloy(Bio De MSM^TM) were studied in the present work. The experimental results demonstrated that grain refining induced by extrusion improves the alloy strength significantly from162 MPa for the as-cast alloy to 241 MPa for the as-extruded one. The anticorrosion properties of the as-extruded alloy also increased.Furthermore, the hemolysis ratio was decreased from 4.7% for the as-cast alloy to 2.9% for the as-extruded one, both below 5%. Bio De MSM^TMalloy shows good biocompatibility after being implanted into the dorsal muscle and the femoral shaft of the New Zealand rabbit, respectively, and there are no abnormalities after short-term implantation. In vivo observation indicated that the corrosion rate of this alloy varies with different implantation positions, with higher degradation rate in the femur than in the muscle.     

碳酸酐酶在四氧化三铁上固定化及其性能表征研究

以四氧化三铁为载体,利用共价结合和交联法相结合的方法制备固定化碳酸酐酶(CA),通过单因素试验,得出CA最佳固定化条件,并对固定化酶进行性能表征.结果表明,在最优的固定化条件下,固定化酶的酶活回收率可达到66.90%,且其pH值稳定性、操作稳定性、热稳定性和贮藏稳定性明显高于同等条件下的游离酶,该固定化酶经5次催化水解底物后仍能保持62.58%的相对酶活.     

镍氢电池负极新型粘合剂及其电极性能

研究了一种镍氢电池负极－金属氢化物电极新型粘合剂ＳＢＳ,测定了以ＳＢＳ为粘合剂的电极性能,并与ＰＴＦＥ和ＨＰＭＣ两种粘合剂进行了对比。研究结果表明：采用ＳＢＳ作粘合剂的电极的耐碱性和柔性优于其它粘合剂,其放电容量、放电电位、大电流放电能力、内阻、电催化活性等性能也较好,尤其是循环性能优良,有望成为一种比较理想的金属氢化物电极粘合剂;ＳＢＳ的最佳加入量为１％左右。     

无线局域网中移动IPv6的实施

移动IPv6允许用户在移动的过程中保持连续的通信.为研究移动IPv6机制的可行性,按照802.11无线局域网标准搭建了移动IPv6实验网络并进行了切换性能测试与分析,实验结果表明标准移动IPv6引入的信号负载不会影响网络性能,网络中UDP应用性能要优于TCP应用性能.     

改性脲醛树脂合成工艺与性能的关系

比较了不同工艺、参数条件下合成改性脲醛树脂性能指标的变化趋势,以及不同工艺参数对改性树脂胶合性能的影响。结果表明:加成反应阶段,pH的降低对改性脲醛树脂各项性能的提高有利;升高反应温度可以改善改性脲醛树脂的综合性能,适中的加成反应时间有助于改性脲醛树脂的各项性能的改善;缩聚反应阶段,pH的降低不利于储存期的延长,但对改性脲醛树脂其他性能的提高均有较好影响,缩聚反应的温度过高或过低均不利于改性脲醛树脂综合性能的提高;初摩尔比明显地影响储存期,初摩尔比高则储存期长;甲醛释放量随初摩尔比降低呈升高趋势。