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   1103篇
  免费   14篇
  国内免费   8篇
安全科学   46篇
废物处理   35篇
环保管理   270篇
综合类   150篇
基础理论   278篇
环境理论   3篇
污染及防治   223篇
评价与监测   73篇
社会与环境   32篇
灾害及防治   15篇
  2024年   9篇
  2023年   13篇
  2022年   12篇
  2021年   16篇
  2020年   23篇
  2019年   21篇
  2018年   22篇
  2017年   25篇
  2016年   29篇
  2015年   25篇
  2014年   33篇
  2013年   100篇
  2012年   40篇
  2011年   72篇
  2010年   38篇
  2009年   46篇
  2008年   55篇
  2007年   83篇
  2006年   42篇
  2005年   37篇
  2004年   30篇
  2003年   34篇
  2002年   37篇
  2001年   29篇
  2000年   18篇
  1999年   14篇
  1998年   15篇
  1997年   14篇
  1996年   15篇
  1995年   9篇
  1994年   14篇
  1993年   13篇
  1992年   7篇
  1991年   6篇
  1990年   10篇
  1989年   12篇
  1988年   6篇
  1987年   10篇
  1986年   5篇
  1985年   6篇
  1984年   8篇
  1983年   4篇
  1982年   4篇
  1981年   12篇
  1980年   5篇
  1979年   6篇
  1978年   4篇
  1977年   4篇
  1975年   8篇
  1974年   5篇
排序方式: 共有1125条查询结果,搜索用时 15 毫秒
261.
    
This article employs a close reading of documents related to the permitting process for the Dakota Access Pipeline (DAPL) and ensuing legal battle in order to argue that extant regulatory frameworks for environmental decision-making are insufficient to promote environmental justice outcomes. By analyzing the US Army Corps of Engineer's responses to comments made during the public comment phase of the NEPA evaluation of the DAPL, I argue that regulatory frameworks may exacerbate environmental justice concerns by incentivizing decision makers to prioritize justification for their decisions and avoiding legal battles over meaningfully engaging with communities. This finding leads me to call for more engagement with energy democracy's orientation toward community-led processes as a corrective to current regulatory systems. This article expands on extant work in environmental communication by more thoroughly investigating the flaws in extant regulatory frameworks and calling for a perspectival shift in environmental decision-making.  相似文献   
262.
Over 50 non-PCB polyhalogenated organic chemicals have been identified by GC/MS in fish from the Great Lakes and other major watersheds near the Great Lakes. p,p′-DDE, hexachlorobenzene, and components of tech-chlordane were the most frequently found chemicals. Also described are advances in sample preparation methodology which allow the identification of many frequently occuring unusual chemicals. Several chemicals not previously reported in environmental samples are identified.  相似文献   
263.
In 2004–05, Niger suffered a food crisis during which global attention focused on high levels of acute malnutrition among children. In response, decentralised emergency nutrition programmes were introduced into much of southern Niger. Child malnutrition, however, is a chronic problem and its links with food production and household food security are complex. This qualitative, anthropological study investigates pathways by which children are rendered vulnerable in the context of a nutritional 'emergency'. It focuses on household-level decisions that determine resource allocation and childcare practices in order to explain why practices apparently detrimental to children's health persist. Risk aversion, the need to maintain self-identity and status, and constrained decision making result in a failure to invest extra necessary resources ingrowth-faltering children. Understanding and responding to the social context of child malnutrition will help humanitarian workers to integrate their efforts more effectively with longer-term development programmes aimed at improving livelihood security.  相似文献   
264.
Following the severe flood events of 1998 and 2000, the United Kingdom's Environment Agency prioritised the need to increase public flood risk awareness. Drawing on data collected during research undertaken for the Environment Agency, this paper contributes to understanding of one aspect of flood awareness: people's recognition that their property is in an area that is potentially at risk of flooding. Quantitative analyses indicate that class is the most influential factor in predicting flood risk awareness, followed by flood experience and length of time in residence. There are also significant area differences. Our qualitative work explores how those defined as 'at risk' account for their lack of awareness or concern about their risk status. We conclude that the problem is often not simply a lack of awareness, but rather, assessments of local risk based on experience that underestimate the impact of rare or extreme events. We underline the importance of engaging with local perspectives on risk and making local people part of 'awareness-raising' processes.  相似文献   
265.
266.
Space medicine     
How does the human body adapt to conditions of weightlessness, and are the changes reversible?  相似文献   
267.
268.
269.
    
Over the years, sampling and experimental design have developed independently with little mutual compatibility. However, many studies do (or should) involve both a sampling design and an experimental design. For example, a polluted site may be exhaustively partitioned into area plots, a random sample of plots selected, and the selected plots randomly assigned to three clean‐up regimens. An established estimator that combines sampling and experimental design is presented and its development explained. Properties of this estimator will be derived and some applications of the estimator will be examined. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   
270.
  总被引:2,自引:0,他引:2       下载免费PDF全文
Three treatments, sediment plus lake water (S+W), sterilized sediment plus lake water (SS+W), and sediment plus filtered lake water (S+FW), were recruited to investigate the growth characteristics of algae during pre-bloom and the importance of algal inocula in the water column and sediment. The results showed that in the water column, biomass of all algae increased in all treatments when recruitment was initiated, whereas this tendency differed among treatments with further increment of temperature. The process of algal growth consisted of two stages: Stage I, the onset of recruitment and Stage II, the subsequent growth of algae. Compared with S+W, in Stage I, SS+W significantly increased the biomass of cyanophytes by 178.70%, and decreased the biomass of non-cyanophytes by 43.40%; In Stage II, SS+W notably stimulated the growth of all algae, thus incurring the occurrence of phytoplankton bloom. Further analyses revealed that both metabolic activity and photochemical activity of algae were enhanced in SS+W, which resulted from the releasing of nutrients from sediment. These results suggest that algal growth in Stage II and algal inocula in the water column can be important factors for the formation of phytoplankton bloom. In addition, possible mechanisms promoting algal recruitment and subsequent growth of algae were explored.  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