通信网技术的发展及其市场预测

本文详细地评述了发展通信网所涉及的一些关键技术以及国外通信网的现状和发展趋热;并简要地介绍了我国通信网的发展情况;最后,对通信网市场进行了预测。     

余热锅炉的发展趋势和欧萨斯锅炉的特点

通过对有色冶金系统余热锅炉的设计和运行之总结，结合欧萨斯锅炉的特点，分析研究了冶金余热锅炉的发展趋势，提出了新的设计思想。     

晶须碳酸钙的开发

利用碳酸化合成方法开发了文石型碳酸钙晶须材料,并对氯化镁浓度的影响和反应过程进行了详细研究。实验表明,氯化镁的加入有利于石石相碳酸钙的形成,在浓度为０．４ｍｏｌ／Ｌ以上可以得到单一文石晶须;反应终点可以通过ＰＨ值的测定加以检测。     

0412-1961

TAN Yanchang; HE Bin; ZHAO Yuhua (Northeast Institute of Technology, Shenyang)     

Identification of atypical Aeromonas salmonicida: inter-laboratory evaluation and harmonization of methods

Estrogen therapy increases plasma HDL levels, which may reduce cardiovascular risk in postmenopausal women. The mechanism of action of estrogen in influencing various steps in hepatic HDL and apolipoprotein (apo) A-I synthesis and secretion are not fully understood. In this study, we have used the human hepatoblastoma cell line (Hep G2) as an in vitro model system to delineate the effect of estradiol on multiple regulatory steps involved in hepatic HDL metabolism. Incubation of Hep G2 cells with estradiol resulted in the following statistically significant findings: (1) increased accumulation of apoA-I in the medium without affecting uptake/removal of radiolabeled HDL-protein; (2) accelerated incorporation of [3H]leucine into apoA-I; (3) selective increase in [3H]leucine incorporation into lipoprotein (LP) A-I but not LP A-I+A-II HDL particles (HDL particles without and with apoA-II, respectively); (4) increased ability of apoA-I-containing particles to efflux cholesterol from fibroblasts; (5) stimulated steady state apoA-I but not apoA-II mRNA expression; and (6) increased newly transcribed apoA-I mRNA message without effect on apoA-I mRNA half-life. The data indicate that estradiol stimulates newly transcribed hepatic apoA-I mRNA, resulting in a selective increase in LP A-I, a subfraction of HDL that is associated with decreased atherosclerotic cardiovascular disease, especially in premenopausal women.     

家庭智能化系统

由新加坡鸿城宝德胜有限公司生产的家庭智能化系统由保安、通讯和管理控制3个系统组成.其中保安系统具有如下功能:①防盗检测,触发警笛、警灯并通过电话通知保安公司;②当电话线或电源发生故障时系统会及时发出警告;③火警检测;④遥控关注模式,当子女分居时,可通过遥控按钮,使老人得到及时的援助.     

卫星通信技术的新进展

本文对国内外卫星通信的最新发展作了详尽论述;并综合概括了未来卫星通信技术的发展趋势;最后,对卫星通信市场进行了预测。     

低荧光阳离子防塌剂WFT─666的合成与性能

ＷＦＴ－６６６是由磺甲基腐殖酸钾、有机硅聚合物、低分子阳离子有机化合物、苯酚、甲醛缩聚而成的一种新型阳离子低荧光防塌剂。本文介绍了ＷＦＴ－６６６的合成及室内性能评定结果。ＷＦＴ－６６６可抗盐至饱和盐水，抗钙和镁，耐２００℃高温，荧光显示低。用该剂处理的钻井液性能稳定，流变参数合理，页岩回收率高，页岩相对膨胀率低，页岩稳定指数高，与其它处理剂的配伍性好。     

海湾战争后防空系统及雷达电子设备的新发展

本文针对海湾战争后的新形势,介绍了战略防御的新构想、战术防空导弹系统及21世纪的防空概念,论述了AEW、AWACS、战场监视目标攻击雷达及其它雷达的最新发展情况,此外,还对国外的反隐身技术进展情况作了介绍。