全文获取类型
收费全文 | 979篇 |
免费 | 85篇 |
国内免费 | 16篇 |
专业分类
安全科学 | 188篇 |
废物处理 | 10篇 |
环保管理 | 349篇 |
综合类 | 240篇 |
基础理论 | 88篇 |
环境理论 | 14篇 |
污染及防治 | 14篇 |
评价与监测 | 15篇 |
社会与环境 | 107篇 |
灾害及防治 | 55篇 |
出版年
2023年 | 16篇 |
2022年 | 19篇 |
2021年 | 27篇 |
2020年 | 30篇 |
2019年 | 34篇 |
2018年 | 39篇 |
2017年 | 52篇 |
2016年 | 73篇 |
2015年 | 63篇 |
2014年 | 41篇 |
2013年 | 87篇 |
2012年 | 47篇 |
2011年 | 63篇 |
2010年 | 54篇 |
2009年 | 43篇 |
2008年 | 53篇 |
2007年 | 51篇 |
2006年 | 61篇 |
2005年 | 59篇 |
2004年 | 29篇 |
2003年 | 25篇 |
2002年 | 11篇 |
2001年 | 13篇 |
2000年 | 14篇 |
1999年 | 12篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1979年 | 6篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1973年 | 5篇 |
1972年 | 2篇 |
1971年 | 6篇 |
排序方式: 共有1080条查询结果,搜索用时 31 毫秒
981.
982.
城市公共场所人群拥挤踩踏事故分析 总被引:12,自引:5,他引:12
城市公共场所人群高度聚集、流动性大,紧急状态时常发生群死群伤的拥挤踩踏事故,造成大量人员伤亡和恶劣的社会影响。笔者首先提出拥挤踩踏事故分析的一般方法,并用群集指数来表征人群高度聚集这一参量;通过对近年来国内外人群拥挤踩踏事故的分析,认为该类事故以人群高度聚集为条件,由公众造成又危害公众,具有诱因众多、发生突然、难以控制等特点;强调事故预防和控制重点是建立事故应急机制,加强人群的管理和疏导等;同时从公共场所的性能优化设计、人群素质和群集密度、人群管理控制以及信息交流等方面分析其事故原因及提出相应对策,对预防此类事故发生,减少群集伤亡有重要意义。 相似文献
983.
建立突发公共事件应急机制的探讨 总被引:5,自引:12,他引:5
闪淳昌 《中国安全生产科学技术》2005,1(2):24-26
本文根据我国目前公共安全的现状、问题与经验,提出了建立健全应急机制的指导思想和工作原则,并根据突发公共事件的分类、分级,探讨了建立和完善突发公共事件的应急体制、机制和法制的途径和方法. 相似文献
984.
突发公共事件与个体防护装备 总被引:2,自引:0,他引:2
本文论述了个体防护装备的作用、种类和发展;从军事斗争、劳动防护和社会公众防护等方面论述了个体防护装备的重要性,指出突发公共事件正在呼唤个体防护装备;对我国个体防护装备的发展和应用提出了意见和建议。 相似文献
985.
The notion that the idea of nature isnot quite the unbiased rule to designsustainable futures is obvious. But,nevertheless, questions about nature, how itfunctions and what it might aim at, is leadingthe controversial debates about bothsustainability and biotechnology. These tworesearch areas hardly have the same theorybackground. Whereas in the first concept, theidea of eternal cyclical processes is basic,the latter focuses on optimization. However,both concepts can work together, but only undera narrow range of public acceptance in Europe.The plausibility of arguments for usingbiotechnology within sustainable technologiesvaries according to the assumed part natureitself plays for reaching optimized states. Theculture related vision of nature's functionshas impact on agricultural biotechnology,dealing not only with food crops but also withnon-food plants like renewable resources thatare used for energy or fiber production. Theseplants are grown to reach sustainabledevelopment. However, there is a fundamentaldifference between regarding biofuels as``renewable' and ``regenerative,' due to thetension between the concepts of ``the natural'and ``the sustainable.' Arguments ofoptimization, efficiency, and efficacy arecritically discussed in order to take thepresent need for sustainable technologies forserious. 相似文献
986.
建设项目竣工环境保护验收中公众参与的有效性分析 总被引:2,自引:0,他引:2
对公众参与在建设项目竣工环境保护验收中的作用、特点作了简单介绍,对影响公众参与有效性的因素作了初步分析,结合实际工作中的经验,对提高建设项目竣工环境保护验收中公众参与有效性因素进行了分析,对存在的问题提出了建议和意见。 相似文献
987.
Madge O. Ertel 《Journal of the American Water Resources Association》1980,16(2):300-304
ABSTRACT: The research project reported here surveyed planners in Coastal Zone Management and “208” programs in New England to determine the nature of their educational and experiential preparation for carrying out public participation functions, and to identify the planners’ own perceptions of the relative importance of those functions and their adequacy for performing them. Criteria for effective programming were developed and used as a standard for comparing various backgrounds with capability for performing necessary tasks. The research indicates that prior planning experience is more directly related to perceived adequacy than either academic or other experiential backgrounds. The survey also revealed a predominant emphasis on activities involving direct public conduct, e.g., organizing citizen advisory groups and conducting public meetings. The results of the analysis were used to make recommendations for curriculum topics that should be incorporated into the training of professional planners so that they will be better prepared to undertake public participation responsibilities. Those recommendations stress preparation for direct public contact, but also for training in other means of public involvement, such as media contact, that are not now being carried out with comparable emphasis or effectiveness. 相似文献
988.
Ung Soo Kim 《Journal of the American Water Resources Association》1980,16(5):804-812
ABSTRACT: The reduction of regional unemployment requires a sufficient demand for regional labor and the demand pattern must parallel that of supply. Due to the interdependency of Appalachian economy with the rest of the Nation, the leakage of the final demand imposed on a subregion of Appalachia is substantial. The more capital intensive the investment the higher the leakage which will lead to less demand for labor in Appalachia. While water resource projects are generally longterm projects which aim at structural changes in a regional economy, consumption expenditures induced by welfare payments or public employment programs are basically temporary measures for the rescue of unemployment. Average consumption and private investment programs may impose on Appalachia a larger material demand but the demand for the total regional labor, off-site and on-site combined, is estimated to be less than that from water resource investments. The public expenditure program for combating regional unemployment must be discretionary based on its purpose and its potential to generate optimum demand for labor which will be created by the pattern of regional resource distribution and interindustrial and interregional interactions. An interregional I/O model is best suited for analysis of this type. 相似文献
989.
Douglas M. Knudson 《Journal of the American Water Resources Association》1979,15(3):718-727
ABSTRACT: Efforts to protect free flowing streams of state significance have met with limited success. Some states established large numbers of “instant” scenic rivers through legislation, then have worked out procedures to add new streams. Other have inadequate current funding and staff to implement the law. The chief barriers to growth of the systems are:
- lack of program staffing and funding and support in some states,
- slowness of the study and planning process,
- landowner uncertainties about the effects on their property and rights, and
- legal complexities.
990.