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   54090篇
  免费   560篇
  国内免费   428篇
安全科学   1644篇
废物处理   2345篇
环保管理   7400篇
综合类   8249篇
基础理论   15080篇
环境理论   28篇
污染及防治   13132篇
评价与监测   3506篇
社会与环境   3349篇
灾害及防治   345篇
  2022年   406篇
  2021年   441篇
  2020年   305篇
  2019年   403篇
  2018年   1068篇
  2017年   1036篇
  2016年   1379篇
  2015年   906篇
  2014年   1316篇
  2013年   4015篇
  2012年   1754篇
  2011年   2641篇
  2010年   2072篇
  2009年   2159篇
  2008年   2586篇
  2007年   2727篇
  2006年   2044篇
  2005年   1806篇
  2004年   1752篇
  2003年   1678篇
  2002年   1673篇
  2001年   1957篇
  2000年   1380篇
  1999年   871篇
  1998年   696篇
  1997年   680篇
  1996年   726篇
  1995年   798篇
  1994年   691篇
  1993年   635篇
  1992年   654篇
  1991年   627篇
  1990年   592篇
  1989年   633篇
  1988年   542篇
  1987年   467篇
  1986年   450篇
  1985年   464篇
  1984年   490篇
  1983年   504篇
  1982年   526篇
  1981年   432篇
  1980年   368篇
  1979年   406篇
  1978年   343篇
  1977年   288篇
  1976年   285篇
  1975年   292篇
  1973年   301篇
  1972年   300篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
Wir danken Dr. Kerndorff für die kritische Durchsicht des Manuskripts.  相似文献   
112.
113.
114.
Mitigation and adaptation synergy in forest sector   总被引:1,自引:1,他引:1  
Mitigation and adaptation are the two main strategies to address climate change. Mitigation and adaptation have been considered separately in the global negotiations as well as literature. There is a realization on the need to explore and promote synergy between mitigation and adaptation while addressing climate change. In this paper, an attempt is made to explore the synergy between mitigation and adaptation by considering forest sector, which on the one hand is projected to be adversely impacted under the projected climate change scenarios and on the other provide opportunities to mitigate climate change. Thus, the potential and need for incorporating adaptation strategies and practices in mitigation projects is presented with a few examples. Firstly, there is a need to ensure that mitigation programs or projects do not increase the vulnerability of forest ecosystems and plantations. Secondly, several adaptation practices could be incorporated into mitigation projects to reduce vulnerability. Further, many of the mitigation projects indeed reduce vulnerability and promote adaptation, for example; forest and biodiversity conservation, protected area management and sustainable forestry. Also, many adaptation options such as urban forestry, soil and water conservation and drought resistant varieties also contribute to mitigation of climate change. Thus, there is need for research and field demonstration of synergy between mitigation and adaptation, so that the cost of addressing climate change impacts can be reduced and co-benefits increased.  相似文献   
115.
This paper explores the practical application of life cycle assessment (LCA) to product system development. While life cycle assessment methods have been studied and demonstrated extensively over the last two decades, their application to product design and development has not been critically addressed. Many organizational and operational factors limit the integration of the three LCA components (inventory analysis, impact assessment and improvement assessment) with product development. Design of the product system can be considered a synthesis of individual decisions and choices made by the design team, which ultimately shape the system's environmental profile. The environmental goal of life cycle design is to minimize the aggregate environmental impacts associated with the product system. Appropriate environmental information must be supplied to decision makers throughout each stage of the development process to achieve this goal. LCA can serve as a source of this information, but informational requirements can vary as the design moves from its conceptual phase, where many design choices are possible, to its detailed design and implementation. Streamlined approaches and other tools, such as design checklists, are essential. The practical use of this tool in product development also depends on the nature and complexity of the product system (e.g. new vs. established), the product development cycle (time-to-market constraints), availability of technical and financial resources, and the design approach (integrated vs. serial). These factors will influence the role and scope of LCA in product development. Effective communication and evaluation of environmental information and the integration of this information with cost, performance, cultural and legal criteria will also be critical to the success of design initiatives based on the life cycle framework. An overview of several of these design initiatives will be presented.  相似文献   
116.
117.
118.
119.
120.
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