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   15519篇
  免费   497篇
  国内免费   1919篇
安全科学   487篇
废物处理   1033篇
环保管理   1661篇
综合类   4617篇
基础理论   4003篇
环境理论   1篇
污染及防治   3180篇
评价与监测   1359篇
社会与环境   1399篇
灾害及防治   195篇
  2024年   28篇
  2023年   133篇
  2022年   374篇
  2021年   357篇
  2020年   358篇
  2019年   287篇
  2018年   1717篇
  2017年   1677篇
  2016年   1501篇
  2015年   503篇
  2014年   476篇
  2013年   555篇
  2012年   952篇
  2011年   1814篇
  2010年   1072篇
  2009年   974篇
  2008年   1287篇
  2007年   1520篇
  2006年   327篇
  2005年   234篇
  2004年   214篇
  2003年   264篇
  2002年   285篇
  2001年   168篇
  2000年   176篇
  1999年   107篇
  1998年   116篇
  1997年   80篇
  1996年   71篇
  1995年   48篇
  1994年   51篇
  1993年   45篇
  1992年   37篇
  1991年   20篇
  1990年   18篇
  1989年   12篇
  1988年   13篇
  1986年   8篇
  1984年   16篇
  1983年   10篇
  1982年   8篇
  1981年   2篇
  1978年   6篇
  1975年   1篇
  1974年   1篇
  1973年   1篇
  1972年   3篇
  1971年   2篇
  1970年   1篇
  1935年   2篇
排序方式: 共有10000条查询结果,搜索用时 343 毫秒
201.
刘裕  蔡诗琪  田欢 《安全》2019,40(2):24-28
随着我国加快从"乡村社会"迈向"城市社会",城市安全问题成为了新时期亟待解答的"国家命题",分析了城市化与城市风险相关问题,提出了适合成都的安全风险预防指标体系,并以"技术防控"开发建设城市安全监测预警系统,以"标准防控"推动企业和公共领域安全管理标准化,以"群众防控"依托安全社区为载体,构建基层社区公共安全体系,为我国城市安全风险防控体系建设提供了宝贵经验和有益启示。  相似文献   
202.
203.
Environmental Science and Pollution Research - Water conservation and soil retention are two essential regulating services that are closely related, and their relationship might produce synergies...  相似文献   
204.
205.
206.
This study aimed at finding effective strategies for high-performance removal of reactive blue 19 (RB19) dye from aqueous solution. Chitosan (CS) films had been prepared by using solvent casting with mild drying for this purpose. The CS films were characterized by X-ray diffraction, field-emission scanning electron microscopy, and Fourier transform infrared (FTIR) spectroscopy. The performance of RB19 removal using CS were evaluated by varying contact time, solution pH, initial dye concentration, and adsorbent dosage. Adsorption isotherms, kinetics, and desorption were investigated by batch experiments. Results showed that CS films exhibited the optimal adsorption performance for RB19 removal and high maximum adsorption capacities of RB19, which were 799 and 822.4 mg g?1 at 20 and 40 °C, respectively. Adsorption kinetic data were well described by the pseudo-second-order kinetic model. FTIR analyses further indicated that interactions between RB19 and the CS film occurred during adsorption. The CS films also exhibited satisfactory desorption of RB19 at about 80 % after 30 min of desorption at pH 11. Our study demonstrated that the CS films can be easily prepared and applied for effective removal of RB19 in treatment of wastewater.  相似文献   
207.
The fifth meeting of INRA’s national network of ecotoxicologists took place on 25 to 27 November 2014 in Biarritz, France. The main aim of the meeting was to bring together ecotoxicologists from INRA and associated partners, providing them ample opportunity to share and discuss their latest scientific results as well as the national policy of research in ecotoxicology and to precise perspectives for the network.  相似文献   
208.
209.
This study examines the relationship between national-level militarism and consumption-based carbon dioxide emissions. We analyze panel data from 1990 to 2010 for 81 nations to determine whether the magnitude of the effects of (1) military expenditures as percent of total gross domestic product and (2) military personnel as percent of total labor force on carbon emissions change over time. Results of two-way fixed effects models highlight the temporal stability of the environmental impacts of both national-level military characteristics. The findings also reveal that the effect of military expenditures on emissions is larger in the more developed OECD nations than in the developing non-OECD nations. Overall, the results support the treadmill of destruction perspective, which suggests that the nations’ militaries are an important social institution to consider in sustainability science research on the human drivers of global environmental change.  相似文献   
210.
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