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   894篇
  免费   43篇
  国内免费   98篇
安全科学   197篇
废物处理   11篇
环保管理   152篇
综合类   375篇
基础理论   72篇
污染及防治   69篇
评价与监测   36篇
社会与环境   65篇
灾害及防治   58篇
  2023年   6篇
  2022年   6篇
  2021年   18篇
  2020年   19篇
  2019年   12篇
  2018年   18篇
  2017年   22篇
  2016年   25篇
  2015年   39篇
  2014年   40篇
  2013年   86篇
  2012年   57篇
  2011年   69篇
  2010年   51篇
  2009年   51篇
  2008年   39篇
  2007年   97篇
  2006年   61篇
  2005年   52篇
  2004年   35篇
  2003年   38篇
  2002年   42篇
  2001年   27篇
  2000年   29篇
  1999年   16篇
  1998年   20篇
  1997年   8篇
  1996年   4篇
  1995年   8篇
  1994年   10篇
  1993年   2篇
  1992年   3篇
  1991年   2篇
  1990年   8篇
  1989年   1篇
  1988年   2篇
  1987年   4篇
  1985年   2篇
  1984年   1篇
  1982年   1篇
  1980年   2篇
  1974年   1篇
  1973年   1篇
排序方式: 共有1035条查询结果,搜索用时 218 毫秒
661.
In Germany, plans at the local level to construct wind turbines often find support as well as rejection – often in both cases for ecological reasons. In this paper, we argue that the key to understanding local wind energy debates is to analyse the interrelations between collective identities and concepts of place. Based on the discourse theory of Laclau and Mouffe, we analyse how two completely contradictory place notions have evolved in a local dispute in a small town in Germany, and how existing political identities have been modified, realigned and superseded in the course of the conflict. Furthermore, we show how the involved discourses are characterised by strong continuities with respect to an earlier struggle over an asphalt mixing plant.  相似文献   
662.
Sustainability science represents a fundamental shift in the nature of research on environmental problems, calling for specialists to expand beyond their disciplinary perspectives in order to cooperate together to understand and address systemic problems. This shift demands a corresponding shift in education in order to equip students with the skills, theories, and methods they need to address contemporary challenges. We argue that case studies are a productive pedagogical approach to teaching about sustainability and teaching for sustainability. Case-based approaches equip students to encounter complexity, manage uncertainty, and generate innovative strategies. In laying out of the pedagogical challenges inherent in sustainability education, we highlight opportunities and demands for environmental communication scholars to contribute to the emerging discipline of sustainability science.  相似文献   
663.
Abstract

Strategic environmental assessment (SEA) in China has developed rapidly since it was introduced into China in the 1990s. Chinese government promulgated the Environmental Impact Assessment Law of China (hereinafter referred to as the EIA Law) in 2002. In this law, it is stipulated clearly that regional and sector plans should be assessed. Through investigating materials and analyzing literatures, this article analyses the practical and academic study achievements of SEA in China that have been achieved since the EIA Law was implemented, probes into the current situation of the main level of SEA in China—plan EIA, then summarizes the development characteristics, and eventually, puts forward the development trends of SEA in China. The research conclusions can offer the foundations for comprehending systematically the progress of SEA in China.  相似文献   
664.
围绕南京城市环境主要问题对国际访客和南京市民进行调查,分别发放186和205份问卷,其中有效问卷为178和200份,回收率分别为95.7%和97.6%,使用拟合优度方法检验。结果表明,国际访客对南京城市环境的满意度明显低于南京市民;国际访客对旅游区环境更看重;两者都认为视觉环境中的户外广告、城市绿化和城市扬尘是南京主要城市环境问题,而政府和普通市民是最应该对南京城市环境问题负责的群体,但南京市民更倾向把环保问题推给政府。围绕调查问卷中所反映的3大主要环境问题,本研究还对北京、新加坡、美国加利福尼亚州等国内外先进地区进行案例分析和经验总结,可为解决南京城市环境问题提供新的思路。  相似文献   
665.
基于3D Voronoi图提出一种能够反映岩石矿物晶粒结构的三维精细化建模方法,分析了晶粒排列均匀化程度及大小等微观结构的变化对模型宏观力学性质的影响程度,并进行了晶粒结构优化设计。通过模拟粉砂质板岩单轴压缩和巴西劈裂的破坏过程,以及与室内试验对比验证了其适用性,并从细观角度揭示了岩石的破坏机理。研究结果表明:通过裂纹生长速率大致可以表征室内试验中弹性变形、非弹性变形和峰值后宏观破坏阶段;岩样在单轴压缩和巴西劈裂破坏过程中以拉伸断裂为主,在宏观上表现为脆性断裂;岩样宏观断裂呈现沿晶和穿晶断裂的组合形态,弹性变形阶段裂纹的萌生和扩展以沿晶断裂为主,而穿晶断裂的扩展和贯通往往导致局部失稳,表现为非弹性变形阶段。  相似文献   
666.
We describe a case study where one software module of an existing physical access control system was re-developed using formal software development methods. Because of increased software quality and comparable development efforts, we are considering the use of formal methods for the future development of critical modules. Further results of this work include the identification of a critical property of the given requirements, as well as insights into overall requirements quality.  相似文献   
667.
目前国内外危险与可操作(HAZOP)分析方法主要用于工艺过程风险分析,而很多伤害事故是由于人员操作过程出现偏差引起的,采用头脑风暴式的HAZOP分析可对操作规程安全性进行系统全面的系统化的审查.结合实例对比分析了操作规程HAZOP分析与工艺过程HAZOP分析的差异,对操作步骤与引导词的关系、分析成员差别、操作规程HAZOP分析风险等级确定和分析重心等问题等进行了研究分析.  相似文献   
668.
The dominant view of calling among management scholars is that it is a stable construct that does not change. This view has resulted in a research void about calling's early development and subsequent evolution. Insight into the dynamic process through which callings develop is fundamental to understanding its role in people's careers and lives. In this study, I focus on the antecedents of calling, a consuming, meaningful passion people can experience toward a domain. I propose a dynamic model in which calling can change over time and can be shaped by antecedent factors, specifically, through people's ability, behavioral involvement, and social comfort in the area toward which they feel a calling. I tested these ideas in a seven‐year, four‐wave prospective longitudinal survey study of 450 amateur musicians. Multilevel analyses indicate individuals who were more behaviorally involved and felt higher social comfort in the calling domain (e.g., music) experienced higher levels of calling early on but experienced a decline in calling over time. Individuals' ability in the calling domain was not related to initial calling or change in calling. I discuss the implications for theory and research on calling, meaning of work, and the dynamics of careers. Copyright © 2012 John Wiley & Sons, Ltd.  相似文献   
669.
The musculoskeletal health among 57 operators at 1 call centre in Sweden was studied with 10 monthly follow-ups, parallel to a reference group of 1,226 professional computer users in other occupations. Operators at this call centre were more symptom-loaded than the other professional computer users in spite of their younger age and shorter exposure to computer work. Symptoms were long-lasting or recurrent. Muscle tenderness and nerve affections in the neck- shoulder region were the most common specific findings and diagnoses at medical examination of incident symptom cases. More extensive studies should be done on the working conditions and health status among call centre workers.  相似文献   
670.
This paper attempts to replicate a safety climate model originally tested in Australia to assess its applicability in a different context: namely, across production workers in 22 medium-sized metal processing organizations in Austria. The model postulates that safety knowledge and safety motivation mediate the relation between safety climate on the one hand and safety compliance and participation on the other. Self-report data from 1075 employees were analyzed using structural equation modeling (SEM). The results of the replication study largely confirmed the original safety climate model. However, in addition to indirect effects, direct links between safety climate and actual safety behavior were found.  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