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   1450篇
  免费   65篇
  国内免费   173篇
安全科学   76篇
废物处理   4篇
环保管理   234篇
综合类   653篇
基础理论   451篇
污染及防治   109篇
评价与监测   15篇
社会与环境   46篇
灾害及防治   100篇
  2023年   3篇
  2018年   4篇
  2016年   7篇
  2015年   11篇
  2014年   3篇
  2013年   8篇
  2012年   8篇
  2011年   171篇
  2010年   93篇
  2009年   40篇
  2008年   19篇
  2007年   30篇
  2006年   22篇
  2005年   31篇
  2004年   227篇
  2003年   219篇
  2002年   87篇
  2001年   57篇
  2000年   54篇
  1999年   86篇
  1998年   58篇
  1997年   127篇
  1996年   37篇
  1995年   31篇
  1994年   37篇
  1993年   70篇
  1992年   55篇
  1991年   39篇
  1990年   6篇
  1989年   7篇
  1986年   2篇
  1984年   2篇
  1983年   2篇
  1982年   8篇
  1978年   1篇
  1977年   1篇
  1976年   1篇
  1975年   1篇
  1974年   5篇
  1973年   2篇
  1972年   1篇
  1971年   2篇
  1967年   1篇
  1966年   1篇
  1965年   1篇
  1964年   1篇
  1963年   1篇
  1961年   2篇
  1957年   1篇
  1933年   1篇
排序方式: 共有1688条查询结果,搜索用时 0 毫秒
971.
煤矿井下作业场所粉尘浓度的法律管理   总被引:2,自引:0,他引:2  
煤矿井下作业场所粉尘浓度管理标准的变动,会给煤矿的防尘工作带来很大影响。煤矿防尘工作的好坏主要取决于综合防尘措施的落实、防尘科技的发展状况以及与此相适应的法规标准。脱离实际的防尘标准,只能导致实际工作中的虚夸与浮躁,不利于防尘工作的正常开展  相似文献   
972.
人工神经网络在沿海区域环境复杂系统预测中的应用   总被引:6,自引:0,他引:6  
针对复杂系统的非线性特征,分析了应用人工神经网络技术实现可持续发展复杂系统预测的可能性,并以上海市和崇明县为例建立沿海区域预测模型,取得了较好的预测结果,为可持续发展复杂系统的预测研究探索了一种新的可能方法。  相似文献   
973.
974.
为探讨内源性二氧化硫(SO2)对动脉血压的影响及其信号转导通路,采用大鼠颈动、静脉插管技术研究SO2对动脉压调节作用,通过离体血管环灌流试验观察SO2对NE引起的主动脉血管环收缩作用的影响,用生物化学方法与实时定量RT-PCR技术研究SO2对离体血管一氧化氮(NO)生成、一氧化氮合酶(NOS)活性和基因表达的调节作用....  相似文献   
975.
2014年是环境经济政策改革元年,环境经济政策建设取得了重要进展和突破。本文综合采用实地调研法、政策追踪法、政策计量分析法对2014年度我国重点环境经济政策的年度进展、成效与问题进行了系统评估与分析,在此基础上提出了下一步我国环境经济政策的改革方向和重点,以及要解决的关键问题。  相似文献   
976.
China is going through a rapid development stage of industrialization and urbanization.Although tremendous achievements have been made in the aspects of energy conservation,improvement of energy effectiveness and development of new and renewable energies,because of the rapid development of economy,it is difficult to change the huge total amount and fast increase of CO2 emission in the near future.China has to confront the tough challenge to address global climate change.China plans to reduce carbon intensity,that is,CO2 emissions per unit GDP,by 40 to 45% by 2020 compared with the 2005 level.It is a strategic option to coordinate domestic sustainable development with coping with global climate change on the basis of China’s national circumstances,representing the core content and key measures for transforming development pattern and realizing low-carbon development.To achieve the target,more capital and technology inputs are required for energy conservation and low-carbon development during the twelfth and Thirteenth Five Year Plan period than in the Eleventh Five Year Plan period.In addition,energy conservation achieved by structural adjustment,industrial upgrading and product value-added improvement is also expected to play a greater role.Therefore,China should strengthen technological innovation,make greater efforts to transform the development pattern,take advantage of the synergistic effect of policies and measures while coping with global climate change and building a domestic tow-oriented society.China should also establish an industrial system characterized by low-carbon emission.Then China will ultimately achieve a win-win situation in both domestic sustainable development and coping with global climate change.  相似文献   
977.
The fundamental way of satisfying the basic needs of human development is to secure the basic needs,limit luxurious and wasteful emissions,and ensure the fulfillment of climate targets,so as to achieve intra-and intergenerational equity.In this paper,the author discusses and analyzes a series of challenges that the development has to face,such as poverty elimination,urbanization,and industrialization,and the problems of increased consumption that is brought about by the improvement of living standards;the author distinguishes the stock emission,which does not need annual updating,and the flow emission of regular consumption;the author also defines the standards of energy consumption and carbon emissions that can meet the basic needs.On this basis,the author proposes the concept and method of carbon budget,compares this method with other means,and in particular,studies and analyzes the implications of international equity and sustainability of carbon budget as part of the international climate regime design.  相似文献   
978.
Climate change has become a hot topic in international environmental negotiations.For post-Kyoto international climate regime negotiations,many countries have proposed a variety of frameworks to share the emission reduction responsibilities and allocate carbon emission rights,and have tried to quantify the emission reduction obligations of all countries based on the perspectives of international equity and individual equity.In this paper,the authors have distinguished the concepts of carbon emissions rights based on these two perspectives respectively,have analyzed the relationship between carbon emissions per capita and economic development,and have calculated and compared the proportion of cumulative emissions per capita of different countries in history and future,and then authors conclude that emission reduction obligations should be allocated based on each country’s conditions,including historical emissions,development stage,and future demands.Developed countries should take the initiative to significantly reduce their emissions because they have already accomplished their industrialization process.However,developing countries are still in the process of industrialization,which requires more emission rights to meet their development needs.For China,the concept of carbon emissions based on individual equity can be used as a theoretical tool for the allocating the international carbon emissions rights.  相似文献   
979.
In the context of global climate change,the internalization of negative externality,which is brought about by the traditional mode of economic growth,has become an inevitable choice.In order to achieve the internalization,it is necessary to make innovations on the market mechanism and system,find the value of environmental capital,establish a new mode of economic growth based on environmental capital,and then transform the environmental capital,an exogenous factor of economic growth,into an endogenous factor.Of this,the key of market mechanism and system innovation is the financial innovation that is based on environmental capital and negative externality;the government defines the initial property right of environmental resources and establishes environment energy trading market,so as to guide enterprises to trade environmental resources(represented by carbon emission permit trading) based on the Clean Development Mechanism,and to vigorously develop environmental finance and carbon finance.  相似文献   
980.
Among all the emission reduction measures,carbon tax is recognized as the most effective way to protect our climate.That is why the Chinese government has recently taken it as a tax reform direction.In the current economic analysis,the design of carbon tax is mostly based on the target to maximize the efficiency.However,based on the theory of tax system optimization,we should also consider other policy objectives,such as equity,revenue and cost,and then balance different objectives to achieve the suboptimum reform of carbon tax system in China.  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