一个基于反馈的信息过滤系统的设计与实现

随着互联网上信息的迅速增长 ,信息过滤技术得到越来越广泛的应用。本文论述了一个基于反馈的内容信息过滤系统的设计和实现。它采用向量空间模型 ,使用类重心分类算法来形成用户兴趣文件 ,采用余弦算法比较待过滤文档和用户兴趣文件的相似度 ,并使用Rocchio反馈模型来重建用户兴趣文件。实验表明 ,本文提出的策略和方法是切实可行的     

原子吸收光谱法测定TC11钛合金中微量Fe

将TC11钛合金试样经盐酸-硝酸在加热的条件下滴加氢氟酸溶解后,加入锶盐以消除基体钛及其它元素对铁的干扰,采用原子吸收分光光度法对其中铁元素含量进行了测定.结果显示,其RSD为0.7%,加标回收率为99.99%～100.05%,微量Fe的质量百分含量为0.020%.该方法测定速度快,灵敏度高,干扰小,测定结果可靠.     

对Turbo C编程环境的两点改进

本文中实现了对TurboC的两点改进：TC软件的重载和其编辑器下文件的自动定时存盘,有一定应用价值并可为其它同类软件参考．     

ISO/TC 176质量管理八项原则在科技期刊编辑出版中的应用

阐述了国际标准化组织ISO/TC 176的质量管理八项原则;论述了“以顾客为焦点、领导作用、全员参与、过程方法、管理的系统方法、持续改进、基于事实的决策方法、与供方互利的关系”质量管理八项原则在科技期刊编辑出版中的应用。指出,质量管理八项原则是ISO 9000族标准的灵魂,质量管理八项原则为提高科技期刊的编辑出版质量提供了理论指导,以顾客（读者）为焦点是科技期刊生存的基础。     

TC码在多机位录制教学课中的应用

多台摄录机在同一现场拍摄后再进行编辑合成是电视节目制作常用的方法之一。其优点是不需要繁多的现场制作设备,到现场拍摄灵活便捷。缺点是编辑合成对位困难。利用TC码精确编辑已有不少论述文章,但涉及到TC码在多机位录制中的应用文章很难查到。我们采用统一设置录像机TC码初始值和记录模式的方法,在编辑合成中取得了比听声音、看动作对位快捷准确的显著效果。     

Comparison of two methods of estimation of low density lipoprotein cholesterol, the direct versus friedewald estimation

Current recommendations of the Adult Treatment Panel and Adolescents Treatment Panel of National Cholesterol Education Program make the low-density lipoprotein cholesterol (LDL-C) levels in serum the basis of classification and management of hypercholesterolemia. A number of direct homogenous assays based on surfactant/solubility principles have evolved in the recent past. This has made LDL-C estimation less cumbersome than the earlier used methods. Here we compared one of the direct homogenous assays with the widely used Friedewald’s method of estimation of LDL-C to see the differences and correlation. We used direct homogenous assay kit to estimate serum LDL-C and high-density lipoprotein cholesterol (HDL-C). Serum Triglyceride (TG) and Total Cholesterol (TC) was estimated and using Friedewald’s formula LDL-C was calculated. The LDL-C level obtained by both methods in 893 fasting serum samples were compared. The statistical methods used were paired t-test and Pearson’s correlation. There was significant difference in the mean LDL-C levels obtained by the two methods at the TG levels <200 mg/dl (p<0.02) and TC levels >150 mg% (p<0.001). The correlation coefficient (r) between Friedewald’s and direct assay estimation was 0.88. Friedewald’s method classified 23.5 % of patients as high cardiac risk whereas there were 17.58% by direct assay. Both had good correlation even though the serum triglyceride and total cholesterol levels affect the difference in LDL-C estimated by both methods. Taking into account the cost and performance, Friedewald’s method is as good or even better for classifying and managing patients.     

中印两国服务贸易国际竞争力比较研究

在经济全球化和服务贸易迅速发展的今天,服务业的发展水平在很大程度上体现了一国的经济发展水平。文章从服务贸易开放度、RCA和TC指数以及国际市场占有率三个角度对中印两国服务贸易的国际竞争力进行了比较分析,发现中国的服务贸易整体竞争力明显落后于印度。文章最后提出了提升我国服务贸易国际竞争力的相应策略。     

Relationship of plasma homocysteine with lipid profile parameters in ischemic heart disease

The present study was undertaken to explore the relationship of plasma homocysteine with other biochemical parameters in ischemic heart disease. Plasma levels of total homocysteine was measured by HPLC—fluorescence detection with internal standard in 60 ischemic heart disease patients and were compared with 30 age matched normal healthy controls. The significant increase of plasma homocysteine was observed in both myocardial infarction and chronic stable ischemic heart disease patients when compared with the controls. The hyperhomocysteinemia appears be to due to increased body demand of vitamins such as folic acid, vitamin B₁₂, B₆, B₂ either alone or in combination to regulate normal homocysteine metabolism.     

基于SMS的监控与数据采集系统的设计

本文论述了采用AT89C52单片机控制GSM模块TC35，并利用短消息传输来实现SCADA系统的方案。该系统通过RUT采集各类数据，整理后由TC35模块发送到监控中心，再由监控中心作出相应的处理。该系统适用于对移动目标的间断监控。     

TC2模型下荷电介子top(∏+t)衰变过程研究

为了给高能实验探测top-pion介子提供有价值的理论指导,我们计算了∏ t介子的各衰变道(∏ t→t-b、∏ t→c-b、∏ t→W γ、∏ t→W Z0)的衰变分支比.结果表明:∏ t→t-b,∏ t→c-b应是探测∏ t介子的主要衰变道.由于∏ t→c-b道是味改变的,背景比较清晰,所以对于较轻的∏ t介子,它是探测∏ t介子的理想衰变道;而对于较重的∏ t介子,∏ t→t-b是最主要的衰变道,但由于∏ t→t-b衰变道的背景不是很清晰,并且重的∏ t介子的衰变宽度很大,使得通过该道探测重的∏ t介子比较困难.