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   16902篇
  免费   2573篇
  国内免费   177篇
安全科学   2652篇
废物处理   270篇
环保管理   5119篇
综合类   7053篇
基础理论   1628篇
环境理论   54篇
污染及防治   561篇
评价与监测   926篇
社会与环境   1061篇
灾害及防治   328篇
  2023年   195篇
  2022年   252篇
  2021年   404篇
  2020年   487篇
  2019年   389篇
  2018年   388篇
  2017年   665篇
  2016年   723篇
  2015年   738篇
  2014年   759篇
  2013年   1098篇
  2012年   1130篇
  2011年   1224篇
  2010年   934篇
  2009年   994篇
  2008年   718篇
  2007年   1053篇
  2006年   1043篇
  2005年   887篇
  2004年   844篇
  2003年   723篇
  2002年   593篇
  2001年   553篇
  2000年   550篇
  1999年   396篇
  1998年   284篇
  1997年   266篇
  1996年   200篇
  1995年   218篇
  1994年   114篇
  1993年   125篇
  1992年   97篇
  1991年   71篇
  1990年   53篇
  1989年   42篇
  1988年   44篇
  1987年   35篇
  1986年   33篇
  1985年   25篇
  1984年   31篇
  1983年   18篇
  1982年   25篇
  1981年   24篇
  1980年   28篇
  1979年   40篇
  1978年   23篇
  1977年   16篇
  1975年   18篇
  1973年   17篇
  1972年   20篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
The present state of accident hazard at work in the Polish mining industry is presented. A comparison is made of the accident indices in relation to other countries. A reference is made to the work safety management system implemented in the mines. Safety management is discussed in terms of risk management. On the basis of the natural death index and that of accidents at work, numerical scales are presented defining the limits of the inadmissable, tolerable, and acceptable risk. The course of variation of risk indices for fatal, serious, and minor accidents is evaluated. The results of the assessment for all kinds of accidents at work in the mining industry are presented.  相似文献   
2.
Incineration is the main option for residual Municipal Solid Waste treatment in France. This study compares the environmental performances of 110 French incinerators (i.e. 85% of the total number of plants currently in activity in France) in a Life Cycle Assessment perspective, considering 5 non-toxic impact categories: climate change, photochemical oxidant formation, particulate matter formation, terrestrial acidification and marine eutrophication. Mean, median and lower/upper impact potentials are determined considering the incineration of 1 tonne of French residual Municipal Solid Waste. The results highlight the relatively large variability of the impact potentials as a function of the plant technical performances. In particular, the climate change impact potential of the incineration of 1 tonne of waste ranges from a benefit of ?58 kg CO2-eq to a relatively large burden of 408 kg CO2-eq, with 294 kg CO2-eq as the average impact. Two main plant-specific parameters drive the impact potentials regarding the 5 non-toxic impact categories under study: the energy recovery and delivery rate and the NOx process-specific emissions. The variability of the impact potentials as a function of incinerator characteristics therefore calls for the use of site-specific data when required by the LCA goal and scope definition phase, in particular when the study focuses on a specific incinerator or on a local waste management plan, and when these data are available.  相似文献   
3.
Life cycle thinking is a good approach to be used for environmental decision-support, although the complexity of the Life Cycle Assessment (LCA) studies sometimes prevents their wide use. The purpose of this paper is to show how LCA methodology can be simplified to be more useful for certain applications.In order to improve waste management in Catalonia (Spain), a Cumulative Energy Demand indicator (LCA-based) has been used to obtain four mathematical models to help the government in the decision of preventing or allowing a specific waste from going out of the borders. The conceptual equations and all the subsequent developments and assumptions made to obtain the simplified models are presented.One of the four models is discussed in detail, presenting the final simplified equation to be subsequently used by the government in decision making.The resulting model has been found to be scientifically robust, simple to implement and, above all, fulfilling its purpose: the limitation of waste transport out of Catalonia unless the waste recovery operations are significantly better and justify this transport.  相似文献   
4.
This study identified the changing preferences of country park visitors in Hong Kong and the potential for such changes to have further negative impacts on the ecologically sensitive areas of country parks. A questionnaire was used to collect feedback from 644 country park visitors to understand their preferences and visitation patterns. To investigate visitors’ preferences and behaviours and to develop better visitor management strategies, the survey data were compared with studies conducted 20 years ago. The results showed that the most popular nature‐based activities of 20 years ago, namely, picnicking and barbecuing, have significantly declined in popularity, while other activities, namely, nature studies and nature photography, have surged in popularity in recent years. These changes in visitor preferences have directly increased the negative impacts of visitors on country parks as they dispersed away from the high intensity recreation zones to the ecological sensitive areas. This emerging group of country park visitors has not been fully considered in the existing approach to visitor management and may irreversibly impact the ecological value of country parks. In this study, visitor management in Hong Kong's country parks was reviewed based on these research findings, and potential improvements were suggested.  相似文献   
5.
Participatory irrigation management (PIM) was adopted in Thailand in 2004 to encourage the sustainable use of water in the agricultural sector. The research presented in this paper sought to understand the relationships between public participation, learning, and the implementation of more sustainable water practices through PIM in Thailand. Data was collected through document reviews, observation, informal meetings, and a total of 55 semi‐structured face‐to‐face interviews of local irrigators from two case study regions around the Krasiew Reservoir. Results showed that participating in PIM activities facilitated both instrumental (e.g., water supply and demand data, benefits of on‐time water delivery) and communicative (e.g., reasons for past PIM failure, expectations of fellow farmers) learning among PIM participants. Findings also revealed that social action is fostered through the recognition of human dignity and compassionate communication that instils a sense of ownership and solidarity among irrigators. Sustainable water practices among local farmers were spurred further through learning that the reservoir is a finite water source.  相似文献   
6.
Fly and bottom ashes are the main by-products arising from the combustion of solid biomass. Since the production of energy from this source is increasing, the processing and disposal of the resulting ashes has become an environmental and economic issue. Such ashes are of interest as a construction material because they are composed of very fine particles similar to fillers normally employed in bituminous and cementitious mixtures. This research investigates the potential use of ash from biomass as filler in bituminous mixtures. The morphological, physical and chemical characteristics of 21 different ashes and two traditional fillers (calcium carbonate and “recovered” plant filler) were evaluated and discussed. Leaching tests, performed in order to quantify the release of pollutants, revealed that five ashes do not comply with the Italian environmental re-use limits. Experimental results show a wide range of values for almost all the investigated properties and a low correlation with biomass type in terms of origin and chemical composition. Furthermore, sieving and milling processes were found to improve the properties of the raw material in terms of grading and sample porosity. The effectiveness of these treatments and the low content of organic matter and harmful fines suggest that most of the biomass ashes investigated may be regarded as potential replacements for natural filler in bituminous mixtures.  相似文献   
7.
页岩气开发面临的环保挑战及建议   总被引:3,自引:2,他引:1  
我国的页岩气勘探开发处于起步阶段,还未建立完善的环保政策,大规模开发将面临诸多环保挑战。我国页岩气主要分布在四川、重庆等南方地区,结合该区域地少人多、地质灾害多发等特点,文章从页岩气压裂作业所需水资源、大量压裂返排液和地层水无害化处理、勘探开发过程中噪声污染以及开发用地与耕地之间的矛盾等方面探讨了页岩气开发面临的主要环境风险,并提出了页岩气开发的环保对策建议。  相似文献   
8.
That segment of the community I would say is just in general pretty disenfranchised. We found that if you want participation you have to go to them. I mean there are days when you just need to go knock on the door.

Brownfields developer in a poor urban neighbourhood

This article considers the role that champions play as advocates for socioeconomically disadvantaged community member involvement in environmental management decision-making. Six case studies of brownfields redevelopment projects located in poor urban neighbourhoods are examined. Analysis of these case studies reveals how champion behaviour, which has typically been studied only in the context of technological innovation, is enacted in public participation efforts in the service of environmental justice. The study finds that champions who emerge in these settings lead the development and implementation of non-standard public participation process innovations.  相似文献   
9.
This paper explores the development towards sustainability management systems (SMSs) in three Swedish local authorities. Many local authorities have extensive experience in using standardised Environmental Management Systems (EMSs). Recently EMSs have extended their reach by widening the scope of the systems including other dimensions of sustainable development. Case studies have been performed in three of the most EMS-experienced local authorities in Sweden. These authorities have extended their EMSs into a sustainability management approach in different ways. This paper discusses the development, possible contributions, and constraints with this development. Expanding EMSs into SMSs can be seen as a learning process in which a larger systems perspective leads to increased awareness that the management system becomes limited by only managing environmental issues. Expanding the EMSs into SMSs may lead to a more complete view of the organisation's total impact on nature and society, and issues that need to be managed.  相似文献   
10.
Book reviews     
Abstract

The basic aim of this article is to briefly explore the links between socio-economic dynamics and desertification in western Lesvos, Greece. The area is characterised by certain socio-economic and development disadvantages, dependence on few productive sectors (mainly on livestock breeding) and by severe problems of land degradation and desertification. The linkages between socio-economic profile, characteristics and development trajectory with the state of environment in the area are identified through a series of in-depth qualitative interviews with local producers (livestock breeders). Research findings reveal the major socio-economic driving forces towards unsustainable productive practices, which contribute to the persistence of the problems of land degradation and desertification.  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