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   14836篇
  免费   547篇
  国内免费   5824篇
安全科学   922篇
废物处理   946篇
环保管理   1177篇
综合类   8187篇
基础理论   2618篇
环境理论   2篇
污染及防治   5690篇
评价与监测   549篇
社会与环境   498篇
灾害及防治   618篇
  2024年   3篇
  2023年   225篇
  2022年   689篇
  2021年   554篇
  2020年   416篇
  2019年   434篇
  2018年   543篇
  2017年   662篇
  2016年   815篇
  2015年   1015篇
  2014年   1167篇
  2013年   1623篇
  2012年   1270篇
  2011年   1350篇
  2010年   966篇
  2009年   961篇
  2008年   1020篇
  2007年   924篇
  2006年   826篇
  2005年   606篇
  2004年   421篇
  2003年   552篇
  2002年   483篇
  2001年   410篇
  2000年   433篇
  1999年   474篇
  1998年   422篇
  1997年   351篇
  1996年   333篇
  1995年   285篇
  1994年   235篇
  1993年   188篇
  1992年   151篇
  1991年   88篇
  1990年   69篇
  1989年   54篇
  1988年   47篇
  1987年   30篇
  1986年   25篇
  1985年   13篇
  1984年   15篇
  1983年   18篇
  1982年   11篇
  1981年   12篇
  1979年   2篇
  1978年   3篇
  1976年   2篇
  1975年   4篇
  1974年   2篇
  1966年   1篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
171.
山东省胶南市地震局在上级业务主管部门精心指导和市委、市政府正确领导下,在兄弟区市的大力支持配合下,认真贯彻落实防震减灾法律法规,切实履行工作职责,依法加强建设工程抗震设防管理,积极主动应对挑战,创新工作思路,扎实提高地震安评工作能力,始终把全市重要建设工程安全性评价工作做为首要工作来抓。2006年对青岛港董家口码头等10项重大工程进行了地震安全性评价工作,工程安评率达到100%,在青岛地区保持领先地位,地震安评工作实现了历史性的突破,从而确保了胶南市各类工程的抗震质量,提高了城乡规划建设安全系数和整体防御能力,保障了全市经济和社会的协调发展。  相似文献   
172.
1972年联合国在瑞典的斯德哥尔摩召开了有113个国家参加的联合国人类环境会议。会议讨论了保护全球环境的行动计划,通过了《人类环境宣言》。会议建议联合国大会将这次会议开幕的6月5日定为“世界环境保护日”。同年10月联合国大会第27届会议接受并通过了这一建议。每年的6月5日,世界各国都开展群众性的环境保护宣传纪念活动,以唤起全世界人民都来注意保护人类赖以生存的环境,自觉采取行动参与环境保护的共同努力,同时要求各国政府和联合国系统为推进环境保护进程做出贡献。  相似文献   
173.
1971年,联合国志愿人员组织正式成立,它的宗旨是动员具有献身精神并有一技之长的志愿人员,帮助发展中国家尽快实现其发展目标。1985年,第40届联大确定从1986年起,每年12月5日为“国际志愿人员日”。1994年12月5日,由共青团中央等单位发起的中国青年志愿者协会在北京成立。中国志愿者也从此在全国各地展开了活动。  相似文献   
174.
Environmental Science and Pollution Research - Glyphosate is a non-selective organophosphate herbicide that is widely used in agriculture, but its effects on soil microbial communities are highly...  相似文献   
175.
Environmental Science and Pollution Research - This study aims at investigating the electrocatalytic oxidation of sodium pentachlorophenate (PCP-Na) using a novel nano-PbO2 powder anode. The...  相似文献   
176.

The adverse impacts of lead and cadmium exposure on health outcomes have been reported in the past. Few studies have been conducted on the relationship between lead and cadmium exposures and disability. We evaluated whether lead and cadmium exposures were associated with functional dependence including the total number of disabilities, activities of daily living (ADL), instrumental activities of daily living (IADL), leisure and social activities (LSA), lower extremity mobility (LEM), and general physical activities (GPA) in an elderly population. A total of 5513 eligible subjects were enrolled in the study from the National Health and Nutrition Examination Survey 2001–2006. Serum lead and cadmium exposure assessments were performed using atomic absorption spectrometry. Functional dependence was assessed by 19 structured questions. The relationships between lead and cadmium exposures and functional dependence were investigated using by multivariable linear regression models. Q2, Q3, and Q4 of lead exposure were significantly associated with the total number of disabilities, with β coefficients of ??0.62 (95% CI ??0.99, ??0.24), ??0.64 (95% CI ??1.02, ??0.26), and ??0.81 (95% CI ??1.19, ??0.42), respectively. This relationship remained significant in males. Furthermore, we analyzed the relationships between lead and cadmium exposure quartiles and various functional dependence metrics, and we determined that lead content was significantly associated with decreased ADL, LEM, and GPA (p?<?0.05) and cadmium content was inversely associated with ADL (p?<?0.05). Our study demonstrated a strong relationship between exposure to lead and cadmium and functional dependence in an elderly population.

  相似文献   
177.

The optimal allocation of sediment resources needs to balance three objectives including ecological, economic, and social benefits so as to realize sustainable development of sediment resources. This study aims to apply fuzzy programming and bargaining approaches to solve the problem of optimal allocation of sediment resources. Firstly, Pareto-optimal solutions of multi-objective optimization were introduced, and the multi-objective optimal allocation model of sediment resources and fuzzy programming model was constructed. Then, from the perspective of multiplayer cooperation, the optimal allocation model of sediment resources was transformed into a game model by using Nash bargaining, and Nash bargaining solution was obtained as the optimal equilibrium strategy. Finally, the influence of different disagreement utility points and bargaining weights on the results was discussed, and the results of Nash bargaining and fuzzy programming methods were compared and analyzed. Results corroborate that Nash bargaining can achieve the cooperative optimization of multiple objectives with competitive relationship and obtain satisfactory scheme. Disagreement utility points and bargaining weights have a certain impact on the optimization results. The solution of fuzzy programming is close to that of Nash bargaining, which provides different ideas for multi-objective optimization problem.

  相似文献   
178.
Environmental Science and Pollution Research - In this paper, the panel data of China’s four municipalities and 223 prefecture-level cities were used to investigate whether the EKC hypothesis...  相似文献   
179.
Environmental Science and Pollution Research - With the acceleration of China’s urbanization process, construction activities have led to a substantial increase in construction waste....  相似文献   
180.
Environmental Science and Pollution Research - This study collected and compiled statistical data on atmospheric pollution in Jilin City, China during 2013–2014, using models and methods to...  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