Application of causality diagram in system safety analysis

Causality Diagram （CD） is a new graphical knowledge representation based on probability theory. The application of this methodology in the safety analysis of the gas explosion in collieries was discussed in this paper, and the Minimal Cut Set, the Minimal Path Set and the Importance were introduced to develop the methodology. These concepts are employed to analyze the influence each event has on the top event - the gas explosion, so as to find out about the defects of the system and accordingly help to work out the emphasis of the precautionary work and some preventive measures as well. The results of the safety analysis are in accordance with the practical requirements; therefore the preventive measures are certain to work effectively. In brief, according to the research CD is so effective in the safety analysis and the safety assessment that it can be a qualitative and quantitative method to predict the accident as well as offer some effective measures for the investigation, the prevention and the control of the accident.     

由CD4098组成的晶闸管三相过零触发器

本文针对晶闸管移相触发的一些弱点，提出了过零触发的观点。应用CD4098单稳态触发器组成了三相过零触发电路，达到了较为理想的调功效果。该触发器电路简单．调试方便，具有一定的实用价值。     

关于提高随书光盘利用率的思考

文章在简要分析随书光盘利用率影响因素的基础上,就如何充分利用随书光盘、提高随书光盘的利用率提出了若干具体对策。     

超声波传感器在智能小车避障系统中的应用

该文为实现智能小车的避障要求,设计了一套超声波传感器测距系统.首先介绍了超声波传感器工作原理和应用电路设计,并详细介绍了使用CD4051的简单电路实现多路超声波信号的循环发射与接收电路以及接收芯片CX20106的使用情况,最后给出了如何提高精度的方法,从而增强了系统的可靠性     

Growing role of CD40 ligand gene transfer therapy in the management of systemic malignancies besides hepatocellular carcinomas

The article "Cationic liposome-mediated trans-fection of CD40 ligand gene inhibits hepatic tumor growth of hepatocellular carcinoma in mice" [doi:10. 1631/jzus.B0820178] by Jiang et a1.(2009) in a recent issue of the Journal of Zhejiang University SCIENCE B was highly thought provoking. The authors have clearly demonstrated the efficacy of CD40 ligand gene therapy in inhibiting the growth of hepatocellu-lar carcinomas. The findings of Jiang et al.(2009) are highly important as they further support and cor-roborate the rapidly expanding role of CD40 ligand gene therapy in the management of systemic malig-nancies besides hepatocellular carcinomas.     

再生障碍性贫血患者外周血T淋巴细胞亚群检测在治疗选择上的意义

目的：探讨再生障碍性贫血患者治疗前后外周血T淋巴细胞亚群检测的变化及其在不同治疗中的意义。为合理治疗提供依据。方法：采用流式细胞技术检测40例再生障碍性贫血患者治疗前后外周血T淋巴细胞亚群检测的变化及CD4＋／CD8＋,并根据其比值与正常对照组比较将患者分为比值正常型、比值倒置和比值超高型3个免疫亚型。同时按常规治疗和联合免疫抑制治疗进行疗效比较。结果：单独常规治疗时。3个亚型组之间疗效无明显差异;联合免疫抑制治疗时,比值正常型患者的总有效率与常规治疗组无显著差异,而免疫倒置型和免疫异常型（比值减低和增高）患者总有效率较同组常规治疗疗效均显著提高（P〈0．05）,也显著高于比值正常者（P〈0．05）。结论：大多数再生障碍性贫血患者存在着CD4＋／CD8＋的失调。再生障碍性贫血患者的发病机制与免疫异常有密切的相关性。T淋巴细胞亚群检测对临床了解病情和发病机制、合理选择治疗方案、提高诊断和治疗水平都具有重要价值。     

边远地方高校图书馆随书光盘的管理与利用

文章围绕边远地方高校图书馆的具体情况及随书光盘的特点,分析了边远地方高校图书馆随书光盘管理现状,对如何“因地制宜”有效提高光盘的利用率提出了一些针对性的建议。     

光盘编目初探

随着光盘技术的成熟,图书馆馆藏光盘数量日益增多,对光盘的科学分编和合理利用已经成为图书馆所面临的一个重要问题。针对光盘的特点,文章根据《中国机读目录格式》的基本要求,结合工作实践,对光盘的著录规则和管理表达了一些看法和建议,提出了几种著录方法和管理模式。     

谈随书附盘的管理和应用

针对目前图书出版业为适应读者阅读需求出现的随书配盘现象,图书馆必须有与之相配套的管理措施.文章分析了以往图书馆界在附盘管理和利用上存在的不足,联系实际,提出解决问题的新举措.