全文获取类型
收费全文 | 3187篇 |
免费 | 416篇 |
国内免费 | 282篇 |
专业分类
安全科学 | 1904篇 |
废物处理 | 47篇 |
环保管理 | 260篇 |
综合类 | 876篇 |
基础理论 | 193篇 |
环境理论 | 1篇 |
污染及防治 | 128篇 |
评价与监测 | 114篇 |
社会与环境 | 77篇 |
灾害及防治 | 285篇 |
出版年
2024年 | 14篇 |
2023年 | 71篇 |
2022年 | 130篇 |
2021年 | 160篇 |
2020年 | 170篇 |
2019年 | 149篇 |
2018年 | 123篇 |
2017年 | 138篇 |
2016年 | 151篇 |
2015年 | 152篇 |
2014年 | 153篇 |
2013年 | 232篇 |
2012年 | 317篇 |
2011年 | 261篇 |
2010年 | 192篇 |
2009年 | 178篇 |
2008年 | 116篇 |
2007年 | 220篇 |
2006年 | 223篇 |
2005年 | 147篇 |
2004年 | 137篇 |
2003年 | 95篇 |
2002年 | 64篇 |
2001年 | 72篇 |
2000年 | 46篇 |
1999年 | 39篇 |
1998年 | 35篇 |
1997年 | 16篇 |
1996年 | 23篇 |
1995年 | 8篇 |
1994年 | 11篇 |
1993年 | 10篇 |
1992年 | 12篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1988年 | 5篇 |
1986年 | 5篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有3885条查询结果,搜索用时 31 毫秒
921.
922.
923.
矿井外因火灾计算机控制及有待解决的若干问题 总被引:2,自引:0,他引:2
针对矿井外因火灾,评价了计算机技术在矿井火灾防治应用中的研究现状,阐述了发展矿井火灾计算机控制技术的重要意义及其应用前景。同时,指出了进一步发展矿井火灾计算机控制技术中有待解决的问题 相似文献
924.
Tom Van Remmen 《Waste management (New York, N.Y.)》1998,18(6-8)
After many years of research and debate, in August of 1997 the United States Environmental Protection Agency (EPA) issued New Source Performance Standards (NSPS) and Emission Guidelines (EG) for medical/infectious waste incinerators in the United States. These new emissions and operational standards establish considerably more restrictive limitations on air emissions for medical/infectious waste incinerators and will undoubtedly have a significant impact on the over 2300 hospitals presently operating an incinerator on-site. This paper will explore the options available to these facilities, and those facilities which may be considering installation of an incinerator, relative to achieving compliance with the NSPS and EG for medical/infectious waste incinerators. 相似文献
925.
超大规模工业厂越来越多地应用于工业生产,但与我国现行防火技术规范存在突出的矛盾,有些地方甚至突破了我国现行防火技术规范。本文即对这一矛盾进行典型事例分析,并研究上应的安全措施。 相似文献
926.
National park resource management planning requires ecological information describing the objectives to be achieved. This information must be quantitative and unambiguous. Since most acts creating United States national parks, beginning with the Yellowstone National Park Act of 1872, specify that these parks should be maintained in a natural condition, resource management objectives for each national park must be defined in terms of quantitative standards of naturalness. Such quantitative standards of naturalness do not yet exist for any national park in the United States. Although this article focuses on US national parks, the same problem exists in national parks, reserves, and wilderness areas throughout the world. The physical evidence needed to develop quantitative standards of naturalness is rapidly disappearing because of the effects of management fires, wildfires, decomposition, successional changes, and other disturbances. Therefore, a nationwide rescue ecology program is recommended to recover as much remaining ecological information as possible before it is lost. This information is essential for developing quantitative standards to restore naturalness to national parks. 相似文献
927.
Risk management entails knowledge of the risk and how best to reduce it; its objective is to minimize losses arising from existing or potential risk. With effective contingency planning, risk analysis and its corollary, consequence analysis, can contribute synergistically to improved risk management. Until recently, risk analysis and contingency or emergency response planning were considered distinct disciplines with little interactive potential. Fortunately, industry now recognizes that linking the two can help ensure public safety as well as preserve the financial integrity of plant owners. Both areas are receiving increased and well-deserved attention; several incidents in recent years have demonstrated that losses could have been greatly reduced if better precautions and procedures had been in place as a result of risk analysis and contingency planning. 相似文献
928.
开展工业行业碳排放绩效研究,对于落实碳减排承诺、完善碳交易体制、推动低碳产业发展具有重要意义。采用郑州市2013年181家工业企业的基础数据,通过构建碳排放综合绩效指标体系和配额分配模型,开展不同行业的综合绩效评价和配额分配模拟。主要结论如下:(1)不同行业的碳排放强度分布极不均衡且与碳排放总量具有一定的关联性,但关联类型不尽相同。电力、热力生产和供应业的碳排放强度最高(5.4115 t/万元),烟草制品业的碳排放强度最低(0.0046 t/万元)。(2)不同行业单位用地碳排放量、单位劳动力碳排放量差异较大。电力、热力生产和供应业的单位用地碳排放及单位劳动力碳排放明显高于其他行业。(3)碳排放综合绩效表明,电力、热力生产和供应业的碳排放绩效最低,汽车制造业的碳排放绩效最高。(4)不同行业因综合绩效的差异获得与基准年碳排放不同增减比例的配额,其中,电力、热力生产和供应业获得的配额最多,化学纤维制造业获得的配额最少。通过碳配额分配模拟,郑州市整体减排18.206万t,减排比例为5.56%。(5)建议完善行业配额分配方案,并试点实施以碳排放综合绩效评价为基础的行业配额分配,实现资源节约、环境保护和碳减排的协同。 相似文献
929.
Sergey Venevsky 《Mitigation and Adaptation Strategies for Global Change》2006,11(1):241-268
The conceptual scheme of integrated assessment of vulnerability to climate change in Siberian forests is elaborated and applied
to the extensive area in Siberia covered by Larch forests. Forest stakeholders on the provincial level are identified to be
the most relevant for an integrated impact assessment. Organisation of the assessment study as a combination of
'top-down' and 'bottom-up' approaches is suggested. Major biophysical vulnerability indexes and regional syndromes are identified
as the growing stock and current increment averaged by administrative unit. Models and data suitability and quality for an
analysis of biophysical vulnerability in conditions of climate change are studied for Siberian forests and future development
trends are identified. An application of the elaborated conceptual scheme, which employs two models of different type and
forest inventory data, is presented for the Larch area. 相似文献
930.
陈伟 《安全.健康和环境》2003,3(7):34-36
本文运用美国道化学公司危险指数评价法对MIBE装置进行定量化的安全评价,说明装置建成后,其固有的危险便客观存在,由于设计时采用了一些安全措施,起到了安全补偿作用,使实际的危险程度达到可接受的范围;同时通过评价,识别导致事故的危险因素,完善安全措施,可以进一步降低装置的风险度。 相似文献