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   1967篇
  免费   133篇
  国内免费   161篇
安全科学   272篇
废物处理   106篇
环保管理   517篇
综合类   891篇
基础理论   88篇
环境理论   2篇
污染及防治   59篇
评价与监测   98篇
社会与环境   216篇
灾害及防治   12篇
  2024年   9篇
  2023年   23篇
  2022年   35篇
  2021年   43篇
  2020年   58篇
  2019年   60篇
  2018年   47篇
  2017年   57篇
  2016年   82篇
  2015年   77篇
  2014年   127篇
  2013年   121篇
  2012年   170篇
  2011年   190篇
  2010年   130篇
  2009年   135篇
  2008年   88篇
  2007年   116篇
  2006年   116篇
  2005年   72篇
  2004年   72篇
  2003年   56篇
  2002年   63篇
  2001年   62篇
  2000年   61篇
  1999年   42篇
  1998年   34篇
  1997年   26篇
  1996年   19篇
  1995年   15篇
  1994年   10篇
  1993年   10篇
  1992年   7篇
  1991年   5篇
  1990年   2篇
  1989年   3篇
  1988年   4篇
  1987年   1篇
  1986年   3篇
  1985年   5篇
  1984年   2篇
  1982年   1篇
  1980年   1篇
  1976年   1篇
排序方式: 共有2261条查询结果,搜索用时 15 毫秒
921.
近几年来,徐州市经济发展迅速,但环保产业发展相对滞后,文章分析了徐州市环保产业的发展现状和存在的问题,提出了相应的解决措施,希望能够对徐州市环保产业的发展起到一定的促进作用。  相似文献   
922.
This paper addresses a measurement of corporate environmental performance, and its application to the analysis of efficiency in the petroleum firms. In order to measure firms' environmental performance, we suggest a framework called “Gscore” that consists of five categories, namely general environmental management (GEM), input, process, output, and outcome. Gscore is a proxy measure of corporate environmental performance based on voluntary environment, health, and safety (EHS) report and is calculated by aggregating the points of the above five-categories. We apply our measurement framework to the data of 39 firms' voluntary EHS reports which are available on the internet. Ten of them, on which efficiency analysis was conducted with Gscore, assets, employee, and profits, are in petroleum and refining industry. According to our results: (1) a gap is found between rhetoric and practical environmental management stemming from calculating the relation between GEM and data part in 39 EHS reports. (2) On the whole, EHS reports of petroleum firms have something in common, but there are significant differences in the type and amounts of disclosed data among the EHS reports. (3) From the results of efficiency analysis, it is found that the number of employee exerts a considerable influence on determining the relative efficiency of petroleum firms, then Gscore, profits, and assets in sequence. Furthermore, Exxon, Ashland, Phillips Petroleum, and ARCO are shown to be efficient among 10 petroleum firms.  相似文献   
923.
通过对星云湖、杞麓湖水体磷含量变化情况、流域产业结构和磷入湖途径的比较分析,认为近年来星云湖水体磷含量水平的大幅提高,使星云湖水质由Ⅲ类在大约5a的时间里下降为V类、劣V类,与星云湖流域及周边磷化工产业的快速发展息息相关。而杞麓湖由于流域内无磷矿资源也没有大的磷化工产业,其磷含量水平得于稳定。  相似文献   
924.
京津冀地区是我国工业发展的核心区域之一 ,大耗水型的重化工结构突出 ,长期发展造成了地区水资源供需的尖锐矛盾 ,并导致了严重的区域环境问题。论文提出了以水资源高效利用为引导机制 ,调整工业结构,建立适水型工业体系是此地区工业发展的必然选择的观点 ;阐述了优化城市工业结构,发展清洁生产,建立滨海产业的建议与措施  相似文献   
925.
Cleaner production (CP) working methods should facilitate the search for feasible CP options and contribute to their on-going implementation in a company. Over the past decade, numerous working methods have been developed in order to cater for specific segments of industry. This paper describes, compares and analyses the core components of six Dutch working methods to develop a framework for CP methodologies, to draft guidelines for the selection of an appropriate working method for a certain industry, and to identify areas which require additional methodology development. A division is proposed between four types of CP working methods: indicators, scan, pre-assessment and assessment. Each of these has its strengths and weaknesses, which calls for a careful selection of the working method, which in turn could be based on size of the company, material- and energy-intensity of the production, and complexity of the production processes. This comparative evaluation further proves that the working methods are still weak in stimulating the corporate transition process from ‘end-ofpipe’ to CP thinking and acting. It is tentatively concluded that an ‘assessment’ is superior in identifying comparatively radical environmental improvements (‘innovations’) as well as in fostering the integration of CP into the daily operation and management of a company. The use of simplified working methods in selected industries, is, however, justified given their ability to contribute to the implementation of relatively obvious CP options.  相似文献   
926.
孝义市焦炭产业在规模不断壮大的同时,面临着严重的资源浪费和环境污染问题.本文应用代谢分析方法对产业链中主要元素碳和元素硫进行代谢分析,找出元素代谢关键环节,为焦炭产业生态链设计提供依据.在此基础上,依据循环经济理念和工业生态理论构建出孝义焦炭产业生态工业网络体系,指明孝义焦炭产业未来发展方向.  相似文献   
927.
化工行业是一个环境风险比较大的行业,由于化工企业经营内容、生产工艺、使用的原材料不同,潜在的环境风险也有很大的差异.为了区别对待合理选址,对化工类项目可能产生的环境风险后果进行环境风险评价与分类,再结合周围环境对环境风险的承载能力进行综合分析,根据环境优先的原则,可以合理的确定化工类项目的选址.  相似文献   
928.
Fugitive emission has been becoming an important source of volatile organic compounds (VOCs) in pharmaceutical industry, but the exact contribution of fugitive emission remains incompletely understood. In present study, pollution characteristics, odorous activity and health risk of stack and fugitive emissions of VOCs from four functional units (e.g., workshop, sewage treatment station, raw material storage and hazardous waste storage) of three representative pharmaceutical factories were investigated. Workshop was the dominant contributor to VOCs of fugitive emission in comparison with other functional units. Extreme high concentration of VOCs from fugitive emission in unsealed workshop (94.87 mg/m3) was observed relative to sealed one (1.18 mg/m3), accounting for 31% and 5% of total VOCs, respectively. Fugitive emission of VOCs in the unsealed workshop mainly consisted of n-hexane, 1-hexene and dichloromethane. Odorous activity indexes and non-cancer hazard ratios of these VOCs from fugitive emission in the unsealed workshop were as high as that from stack exhaust. Furthermore, cancer risk of dichloromethane from fugitive emission and stack exhaust was up to (1.6-1.8) × 10−5. Odorous activity or health risk index of the VOCs from fugitive emission was up to 13 or 11 times of the corresponding threshold value, posing remarkable health threat on pharmaceutical workers. Our findings highlighted the possibly underestimated contribution of fugitive emission on VOCs in the pharmaceutical industry.  相似文献   
929.
建筑节能节水节地节材是按照循环经济的3R原则,实现环境保护工作的“三个转变“、建设节约型社会的必然要求.但目前我国在这一领域的还处于发展初期,其立法尤为薄弱,主要存在的问题是:一、可持续发展思想和循环经济理念未得到充分体现;二、环境影响评价制度难以推动循环经济的发展;三、相关标准体系不健全,浪费水、能、地、材的法律责任不明确;四、建筑业资源再生利用制度不健全.文章阐述了循环经济的内涵,并就我国建筑业循环经济发展中的法律障碍提出了初步的完善对策.  相似文献   
930.
环保产业的特点及其前景   总被引:1,自引:0,他引:1  
文章分析了环保产业作为环境保护的重要支撑,已成为具有广阔的发展前景的新兴产业,具有新兴产业发展的一般特征。以环境法规和环境管理政策去推动环保产业发展,已成为世界环保产业发展新的动力,使环保产业在国际上构成一个竞争激烈的潜在的大市场。  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