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   33909篇
  免费   360篇
  国内免费   476篇
安全科学   1043篇
废物处理   1624篇
环保管理   3989篇
综合类   5606篇
基础理论   8834篇
环境理论   19篇
污染及防治   8877篇
评价与监测   2308篇
社会与环境   2243篇
灾害及防治   202篇
  2023年   159篇
  2022年   365篇
  2021年   355篇
  2020年   251篇
  2019年   304篇
  2018年   523篇
  2017年   533篇
  2016年   812篇
  2015年   611篇
  2014年   970篇
  2013年   2695篇
  2012年   1168篇
  2011年   1588篇
  2010年   1299篇
  2009年   1330篇
  2008年   1594篇
  2007年   1625篇
  2006年   1417篇
  2005年   1217篇
  2004年   1104篇
  2003年   1211篇
  2002年   1057篇
  2001年   1396篇
  2000年   959篇
  1999年   582篇
  1998年   371篇
  1997年   399篇
  1996年   386篇
  1995年   463篇
  1994年   485篇
  1993年   395篇
  1992年   404篇
  1991年   395篇
  1990年   438篇
  1989年   375篇
  1988年   333篇
  1987年   312篇
  1986年   270篇
  1985年   284篇
  1984年   296篇
  1983年   290篇
  1982年   281篇
  1981年   241篇
  1980年   197篇
  1979年   215篇
  1978年   198篇
  1975年   155篇
  1974年   143篇
  1972年   151篇
  1971年   142篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Abstract: As zebra mussels (Dreissena polymorpha) continue to spread among inland lakes of the United States and Canada, there is growing interest from professionals, citizens, and other stakeholders to know which lakes are likely to be colonized by zebra mussels. Thus, we developed a classification of lake suitability for zebra mussels on the basis of measured or estimated concentrations of dissolved calcium in lake water and applied the classification to >11,500 lakes in Wisconsin and the Upper Peninsula of Michigan. The majority of lakes (58%) were classified as unsuitable (<10 mg/L Ca) for survival and reproduction of zebra mussels, 27% were identified as suitable (≥21 mg/L Ca), and 15% were classified as borderline suitable (≥10 and <21 mg/L Ca). Of the 77 inland lakes with confirmed zebra mussel records for which data on dissolved calcium were available, our method classified 74 as suitable and 3 as borderline suitable. To communicate this lake‐specific suitability information and to help prioritize regional efforts to monitor and prevent the expansion of zebra mussels and other invasive species, we developed a web‐based interface (available from http://www.aissmartprevention.wisc.edu/ ). Although we are still uncertain of how access to suitability information ultimately affects decision making, we believe this is a useful case study of building communication channels among researchers, practitioners, and the public.  相似文献   
992.
Environmental Science and Pollution Research - The order Odonata has been regularly used as an indicator of the ecosystem’s condition. The objective of this review was to analyze the...  相似文献   
993.
Environmental Science and Pollution Research - The scientific knowledge produced by academic research can be valued in all sectors of human activity, including private sector. The ROVALTAIN...  相似文献   
994.
Environmental Science and Pollution Research - The process TiO2/PAC/UV-vis has been under study and compared with the isolated treatments of adsorption and photocatalysis determining possible...  相似文献   
995.
Environmental Science and Pollution Research - Acrylamide (AA) is a hazardous chemical that is widely used in industrial practices. Spirulina platensis (SP) is a blue green alga that is rich in...  相似文献   
996.
Environmental Science and Pollution Research - Banana is one of the most important agricultural products of Ecuador. It relies on intensive monoculture cropping systems with a large volume of...  相似文献   
997.
Environmental Science and Pollution Research - This paper presents the synthesis of a hybrid material through the use of natural pozzolan and titanium(IV) isopropoxide using the sol-gel method and...  相似文献   
998.
Environmental Science and Pollution Research - Trophic status in surface waters has been mostly monitored by measuring soluble reactive phosphorus (SRP) and total phosphorus (TP). Additional to...  相似文献   
999.
Environmental Science and Pollution Research - Persistent organic pollutants (POPs) are still globally distributed and can exert different effects on ecosystems. Little is known about the...  相似文献   
1000.
Environmental Science and Pollution Research - Environmental arsenic exposure in adults and children has been associated with a reduction in the expression of club cell secretory protein (CC16) and...  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