首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   45598篇
  免费   468篇
  国内免费   554篇
安全科学   1281篇
废物处理   2040篇
环保管理   5297篇
综合类   9772篇
基础理论   11072篇
环境理论   24篇
污染及防治   11650篇
评价与监测   2937篇
社会与环境   2308篇
灾害及防治   239篇
  2022年   470篇
  2021年   454篇
  2020年   324篇
  2019年   384篇
  2018年   729篇
  2017年   694篇
  2016年   1078篇
  2015年   792篇
  2014年   1253篇
  2013年   3517篇
  2012年   1479篇
  2011年   1950篇
  2010年   1626篇
  2009年   1662篇
  2008年   1971篇
  2007年   2000篇
  2006年   1736篇
  2005年   1480篇
  2004年   1406篇
  2003年   1432篇
  2002年   1310篇
  2001年   1660篇
  2000年   1154篇
  1999年   728篇
  1998年   502篇
  1997年   506篇
  1996年   496篇
  1995年   616篇
  1994年   615篇
  1993年   509篇
  1992年   529篇
  1991年   518篇
  1990年   567篇
  1989年   520篇
  1988年   423篇
  1987年   407篇
  1986年   367篇
  1985年   392篇
  1984年   416篇
  1983年   407篇
  1982年   397篇
  1981年   388篇
  1980年   309篇
  1979年   338篇
  1978年   289篇
  1977年   236篇
  1974年   240篇
  1972年   248篇
  1971年   241篇
  1967年   263篇
排序方式: 共有10000条查询结果,搜索用时 363 毫秒
31.
Environmental Economics and Policy Studies - Streets are an essential element of cities, and their design has a profound impact on their functionality to the movement of people and their...  相似文献   
32.
Journal of Material Cycles and Waste Management - Material flow analysis (MFA) is a well-established tool for supporting decisions on nutrient management. This paper shows the importance of the...  相似文献   
33.
34.
Gentle remediation options (GRO) are risk management strategies/technologies that result in a net gain (or at least no gross reduction) in soil function as well as risk management. They encompass a number of technologies, including the use of plant (phyto‐), fungi (myco‐), and/or bacteria‐based methods, with or without chemical soil additives or amendments, for reducing contaminant transfer to local receptors by in situ stabilization, or extraction, transformation, or degradation of contaminants. Despite offering strong benefits in terms of risk management, deployment costs, and sustainability for a range of site problems, the application of GRO as practical on‐site remedial solutions is still in its relative infancy, particularly for metal(loid)‐contaminated sites. A key barrier to wider adoption of GRO relates to general uncertainties and lack of stakeholder confidence in (and indeed knowledge of) the feasibility or reliability of GRO as practical risk management solutions. The GREENLAND project has therefore developed a simple and transparent decision support framework for promoting the appropriate use of gentle remediation options and encouraging participation of stakeholders, supplemented by a set of specific design aids for use when GRO appear to be a viable option. The framework is presented as a three phased model or Decision Support Tool (DST), in the form of a Microsoft Excel‐based workbook, designed to inform decision‐making and options appraisal during the selection of remedial approaches for contaminated sites. The DST acts as a simple decision support and stakeholder engagement tool for the application of GRO, providing a context for GRO application (particularly where soft end‐use of remediated land is envisaged), quick reference tables (including an economic cost calculator), and supporting information and technical guidance drawing on practical examples of effective GRO application at trace metal(loid) contaminated sites across Europe. This article introduces the decision support framework. ©2015 Wiley Periodicals, Inc.  相似文献   
35.
36.
37.
Biomethane production through biogas upgrading is a promising renewable energy for some industries which could be part of the equilibrium needed with fossil fuels consumption to achieve a sustainable society. This paper presents a comprehensive list of biogas upgrading technologies focused on carbon dioxide removal as well as recent advances reported by researcher with wide expertise in this topic. Additionally, an extensive costs–performance comparison among the technologies studied is discussed. Among the different alternatives, chemical scrubbing stood out to achieve high biomethane purities while cryogenic technologies proved to be effective against methane losses. Regarding the different costs, water scrubbing and membrane separation seem to be the most affordable techniques.  相似文献   
38.
39.
Environmental Science and Pollution Research - The reduction of estrogen levels, as a result of menopause, is associated with the development of metabolic diseases caused by alterations in...  相似文献   
40.
To explore the relationships between human factors and accident proneness of coal mine workers, the depth perception, dark adaptation and vigilance abilities of 239 Chinese coal mine workers were tested and their accident proneness was surveyed with an accident proneness questionnaire. The results indicated that dark adaptation and vigilance abilities of the mine workers declined with increasing age. Vigilance had a significant negative relationship with accident proneness. There were significant differences in vigilance between coal mine workers doing different types of work. Individual difference in vigilance was relevant to the type of work that an individual did in a coal mine. The dark adaptation index had a significant positive relationship with accident proneness. Coal mine workers with weaker dark adaptation ability were also more accident prone. Some ergonomics recommendations concerning coal mine safety management in China are proposed.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号