钒－4－（2－噻唑偶氮）－间苯二酚的络合吸附波研究

运用单扫描示波极谱法，在ｐＨ５．５的乙酸－乙酸钠介质中找到了钒（Ｖ）－４－（２－噻唑偶氮－）间苯二酚（ＴＡＲ）络合物灵敏的吸附波，发现Ｖ（Ｖ）的浓度在２×ｌ０－３～４×ｌ０－６ｍｏｌ·Ｌ－１范围内与波峰高成线性关系；此吸附波为不可逆的络合吸附波；Ｖ（Ｖ）－ＴＡＲ络合比为１：１．运用该法测定矿石中的微量钒，得到了满意结果。     

On arcs with weighted points

In the present paper we start the study of arcs with weighted points in a finite projective plane, and we get some particular results about the existence or non-existence of these arcs.     

论先秦至秦汉时期岭南的民族及其经济

本文探讨了今广东、广西在先秦至秦汉时期的民族形成过程和经济发展状况，并分析了这一时期岭南经济发展的内在原因。     

加强P除环上半正定（正定）自共轭矩阵乘积的特征值

得到了下述结果：１）加强Ｐ除环上两个ｎ阶半正定自共轭矩阵之积在Ｒ中至少有ｎ个形如‖ａ‖~２的特征值；特别地，当它们可换时，其积仍为半正定自共轭矩阵；２）加强Ｐ除环上两个ｎ阶正定自共轭矩阵之积在Ｒ中至少有ｎ个形如‖ａ‖~２（‖ａ‖≠０）的特征值；特别地，当它们可换时，其积仍为正定自共轭矩阵。     

贸易技术壁垒及其对中国的挑战

随着国际贸易的发展和全球市场竞争的日趋激烈,发达国家越来越多地利用贸易技术壁垒充当保护主义的新工具。这加大了我国商品出口的难度,极大地阻碍了国际贸易的正常发展。面对这一挑战,我国在应对时存在着诸如出口产品质量较低等一系列缺陷,故而常在国际贸易中处于不利地位。为此,我们应采取包括建立完整通畅的信息体系在内的一系列措施,来跨越国际贸易技术壁垒,从而促进国际贸易的发展。     

Characterizations of geometric distribution and discrete IFR (DFR) distributions using order statistics

Let X be a discrete random variable the set of possible values (finite or infinite) of which can be arranged as an increasing sequence of real numbers a₁<a₂<a₃<…. In particular, a_i could be equal to i for all i. Let X_1n≦X_2n≦?≦X_nn denote the order statistics in a random sample of size n drawn from the distribution of X, where n is a fixed integer ≧2. Then, we show that for some arbitrary fixed k(2≦k≦n), independence of the event {X_kn=X_1n} and X_1n is equivalent to X being either degenerate or geometric. We also show that the montonicity in i of P{X_kn = X_1n | X_1n = a_i} is equivalent to X having the IFR (DFR) property. Let a_i = i and $\text{G(i) = P(X≧i), i = 1, 2, …}$. We prove that the independence of {X_2n ? X_1n ∈B} and X_1n for all i is equivalent to X being geometric, where B = {m} (B = {m,m+1,…}), provided G(i) = q^i?1, 1≦i≦m+2 (1≦i≦m+1), where 0<q<1.     

网絡协議TCP/IP

网络协议TCP/IP,分别相当于ISO/OSI参考模式中的第四层和第三层,源于美国国防部ARPANET的协议标准.目前,在高档微机工程工作站中得到广泛的应用,并成为工业界的一个“公认”标准. 本文介绍TCP/IP协议,并结合对B-NET(运行于16位微机DUAL系统83和UNIX系统V)中的TCP/IP的提取和分析,着重说明它们的接口及其执行过程机理.     

中港两地法律冲突的解决原则及其现行的国际私法规范

“一国两制”已从理论的构思即将跨入社会实践阶段.香港特别行政区1997年成立后,我国将出现一崭新的法律现象——“一国两法”。那么在一个主权国家之内,如果存在着不同的法律区域,而这些不同法域民事法律关系的主体又不可避免地要进行交往,这就产生了这种跨区域的民事法律关系受哪一区域的法律调整的问题。这种法律上的矛盾和抵触状态,法律上称之为“区际法律冲突”。     

The effect of information on health risk valuations

This article examines the effect of familiarity with chronic lung disease on people's willingness to pay to reduce their risk of contracting chronic bronchitis, and on their willingness to increase their risk of auto death to reduce chronic bronchitis risk. We find that persons who have a relative with chronic lung disease are willing to give up more income to reduce their risk of chronic bronchitis than persons with no first-hand knowledge of the disease; however, their willingness to increase their risk of auto death to reduce their risk of chronic bronchitis is no different, on average, than persons with no first-hand knowledge of lung disease. This suggests that responses to risk-risk tradeoffs may be more stable than responses to risk-income choices.This research was sponsored by Resources for the Future and by the U.S. Environmental Protection Agency, Office of Policy Planning and Evaluation, Alan Carlin and Joel Scheraga, project officers. We thank Robert Mitchell for his help in conducting focus groups, and Caroline Harnett and Sari Radin for research assistance. Stan Presser, Sue Dowden, and Tim Triplett of the University of Maryland's Survey Research Center administered the survey. We especially thank Stan Presser for his suggestion that we sample relatives of people with chronic lung disease. We also thank Kip Viscusi, Wes Magat, and Joel Huber for making available their computer programs and data, and Ajay Kalra for programming help. Paul Portney and John Mullahy provided useful comments on an earlier draff of the article, as did two referees.     

TM_(010)模圆柱腔GUNN振荡器

本文论述了 TM_(010)模式圆柱腔 GUNN 振荡器的理论基础、设计原理与使用特点。这种振荡器在微波技术中作为中精度、小功率信号源在测量、雷达、微波通信、卫星通信以及微波报警器等方面有广泛的应用。