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   34490篇
  免费   310篇
  国内免费   303篇
安全科学   852篇
废物处理   1569篇
环保管理   4073篇
综合类   5986篇
基础理论   8505篇
环境理论   11篇
污染及防治   9124篇
评价与监测   2535篇
社会与环境   2282篇
灾害及防治   166篇
  2022年   340篇
  2021年   352篇
  2020年   209篇
  2019年   277篇
  2018年   532篇
  2017年   519篇
  2016年   844篇
  2015年   588篇
  2014年   904篇
  2013年   2762篇
  2012年   1075篇
  2011年   1458篇
  2010年   1207篇
  2009年   1244篇
  2008年   1466篇
  2007年   1569篇
  2006年   1410篇
  2005年   1152篇
  2004年   1142篇
  2003年   1123篇
  2002年   1052篇
  2001年   1405篇
  2000年   931篇
  1999年   633篇
  1998年   416篇
  1997年   425篇
  1996年   466篇
  1995年   460篇
  1994年   445篇
  1993年   425篇
  1992年   387篇
  1991年   384篇
  1990年   382篇
  1989年   356篇
  1988年   339篇
  1987年   294篇
  1986年   266篇
  1985年   273篇
  1984年   316篇
  1983年   298篇
  1982年   349篇
  1981年   270篇
  1980年   230篇
  1979年   260篇
  1978年   232篇
  1977年   207篇
  1976年   177篇
  1975年   181篇
  1974年   184篇
  1973年   163篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Mountain ecosystems are considered vulnerable to early impacts of climate change. Whether and how local residents of these areas perceive these changes, however, remain under-studied questions. By conducting a household survey in the Khumbu region of Nepal, this study assessed local residents’ experience-based perception of changes in climate trends and patterns, perceived risk, and attitudes towards climate issues. Multivariate cluster analysis based on residents’ climate change beliefs revealed three segments: “Cautious,” “Disengaged,” and “Alarmed.” A comparison of these segments along key psychosocial constructs of Protection Motivation Theory (PMT) revealed significant inter-segment differences in residents’ perception of severity, vulnerability, response efficacy, self-efficacy, and response cost associated with engaging in mitigating behavior. Results shed light on how residents of high elevation areas that are considered to be exposed to early impacts of climate change perceive the risk and intend to respond. These findings could also assist stakeholders working in other similar mountain ecosystems in understanding vulnerability and in working towards climate readiness.Electronic supplementary materialThe online version of this article (10.1007/s13280-020-01369-x) contains supplementary material, which is available to authorized users.  相似文献   
992.
Environmental Science and Pollution Research - For the photocatalytic degradation of antioxidant 2,6-di-tert-butyl-hydroxytoluene (BHT), several TiO2-based composites have been prepared in MWCNT...  相似文献   
993.
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   
994.
Environmental Science and Pollution Research - In this study, the photocatalytic degradation of four fungicides, myclobutanil, penconazole and difenoconazole (triazole compounds) and boscalid...  相似文献   
995.
Environmental Science and Pollution Research - In this work, the activated persulfate oxidation of ciprofloxacin (CIP) using a low-grade titanium ore under sunlight or simulated sunlight were...  相似文献   
996.
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   
997.
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   
998.
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   
999.
Environmental Science and Pollution Research - Formation of oil-suspended sediment aggregates (OSAs) is believed to be one of the natural cleaning processes in the marine environment. In this...  相似文献   
1000.
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   
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