基于改进的BP网络的CD4细胞图像识别

采用改进的BP网络分类器对CD4细胞图像进行识别.首先对图像进行了预处理,分析了图像的特征,然后通过增L减R法选择,介绍了BP网络分类器和LM算法的原理,构建了基于LM算法的BP网络分类器,较好地实现了CD4细胞的识别.     

对《中国学术期刊（光盘版）检索与评价数据规范》的几点看法

《CAJ－CD规范》的试行，为中国学术期刊的检索与评价奠定了坚实的基础，但该规范在其主要项目及编排格式和标点符号的应用方面存在一些问题，值得商榷，主要表现在选择余地过大，难以统一，操作时不好把握，部分地方不符合“简明，易行”的原则以及有关本属于检索与评价内容的部分有空白点，尚未涉及。     

基于单片机"看门狗"抗干扰技术的探讨

在实验中开发出来的各种控制小系统经常会出现运行不稳定、死机或停不了机即程序跑飞等现象,这是由于恶劣的工业现场环境如大功率感性负载的干扰所至。基于单片机的“看门狗”技术能解决这个问题。本文将通过应用实例,分别介绍用软件和硬件来实现“看门狗”技术。为技术人员在单片机开发过程中出现的干扰现象提供一个有效的解决思路。     

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。