矿产资源规划的若干问题研究

矿产资源规划是实现资源可持续利用和矿业可持续发展的重要保证.矿产资源规划的编制是…项新的工作,许多问题还处在探索当中.作者结合参与区县级矿产资源规划工作的实际,对矿产资源规划编制工作中存在的若干问题进行了探讨,提出了一系列切实可行的解决办法和措施.在规划的过程中,应注意引导下面的几个问题,以有利于国家体系性规划的顺利进行.     

SARS防治无效成本的制度经济学反思

2002年底SARS在中国的首度出现有一定的偶然性,但2003年在中国的大面积爆发与蔓延却有着一定的必然性。中国在防治SARS过程中出现了大量的无效成本,这本质上是我国经济转型和改革开放以来经济社会发展目标和实施过程中的失误和偏颇的集中反映,是制度性失误的成本。在现有制度约束下,政府、企业和居民等主体的不当行为直接生成了现实的无效成本。以SARS事件为鉴,我们应重新审视中国经济社会发展的路径选择。从转变政府职能切入,重构现存的公共卫生制度和危机管理制度应该是后SARS时期政策改革的着力点。     

Communique of the National Sample Survey of Fertility and Birth Control (abstract)

The State Family Planning Commission in China surveyed 2,151,212 people, including 459,269 married women aged 15-57 on fertility and birth control, in July, 1988 from 30 provinces and other regions. From 1980- 87 the average total fertility rate was 2.47 vs. 4.01 in the 1970s. Fertility rates in the 80s were 1.33 for cities, 2.43 for towns, and 2.84 for villages. 1st parity births rose from 44.15% to 52.55% from Jan. to July of 1988 and 2nd parity births were about 30%. Women aged 50-57 had an average of 5.27 children while women aged 45-59 had an average of 4.44 children. 71.21% of childbearing-age women use contraception: 10.99% use male sterilization, 38.24% use female sterilization, 41.48% use IUDs, 4.91% oral pills, 2.65% condoms, 0.42% external contraceptives, and 1.32% use other methods. 13.79% of the married, childbearing-age couples have one-child certificates. The population of China as of April 1989 was 1.1 billion. In 1988 the birth rate was 20.78/1000 and the death rate was 6.58/1000.     

Bulletin of major figures from manual tabulation of the national sample survey on fertility and birth control of China

The State Council, the State Family Planning Commission, the State Statistical Bureau, the State Planning Commission, the Ministry of Finance, and the Ministry of Public Security of China together carried out a national sample survey on fertility and birth control in China in 1988. The survey was carried out in 30 provinces, autonomous regions, and municipalities directly under the Central Government. The Tibetan Autonomous Region and the Hainan Province were surveyed for the 1st time, but the results from Tibet were not collected in time for this publication. The main respondents were the married women at age 15-57, with 2,114,591 people surveyed and a sampling proportion of 1.98/1000. This article describes the survey and its results according to birth rate, parity composition, and rural-urban fertility differences. Birth rates, mortality rates, and natural increase rates from high to low orders were tabulated for: urban areas, farms, towns, rural townships, and suburban townships. With the first 1/2 of 1988 birth rates tabulated, it was estimated that the total number of births in China will be less than in 1987. In 1987, the rate of 3rd or higher parity birth was below 5% in 6 provinces and municipalities, but 10 provinces and autonomous regions were over 20%. Fertility rates showed considerable disparity depending on the locational demographics (e.g. birth rates in urban areas were 14.3/1000 yet birth rates were 24.3/1000 in suburban townships).     

凝胶色谱图象计算机分析技术用于DNA检测的实验研究

用计算机图象分析技术对凝胶色谱图象进行分析从而获得DNA分子量和其它参数 构成了数字化凝胶色谱图象计算机系统分析系统。本文介绍了该项技术的实验仪器构成、工作原理及国内外有关的最新发展情况 并结合临床实验给出了实验分析结果。     

拉萨柳梧大桥抗震性能研究

复式钢箱提篮拱是一种新型的桥梁结构形式，以拉萨柳梧大桥为例主要介绍了该桥型的受力特点、动力特性及其在地震作用下的反应特性。复式钢箱提篮拱桥面系在横桥向地震作用下横向位移量较大，不同方向地震作用下，主副拱内力响应不同，主桥拱肋有较好的整体性及抗震性能。     

甲苯二异氰酸酯交联聚乙烯醇类环保粘合剂

采用正交实验法探讨在水基中甲苯二异氰酸酯(TDI)交联聚乙烯醇(PVA)的反应.结果表明少量TDI的加入,较大程度地提高PVA胶水的粘结性能和耐水性能.同时还探讨了PVA的含量、TDI的加入量、催化剂-X和交联反应的温度等对该粘合剂性能的影响.从反应原理和反应后游离TDI的量的检测结果说明其对环境和人体健康无明显影响.