全文获取类型
收费全文 | 949篇 |
免费 | 23篇 |
国内免费 | 10篇 |
专业分类
安全科学 | 45篇 |
废物处理 | 6篇 |
环保管理 | 173篇 |
综合类 | 518篇 |
基础理论 | 37篇 |
环境理论 | 3篇 |
污染及防治 | 25篇 |
评价与监测 | 94篇 |
社会与环境 | 50篇 |
灾害及防治 | 31篇 |
出版年
2023年 | 1篇 |
2022年 | 5篇 |
2021年 | 10篇 |
2020年 | 13篇 |
2019年 | 9篇 |
2018年 | 6篇 |
2017年 | 11篇 |
2016年 | 30篇 |
2015年 | 20篇 |
2014年 | 29篇 |
2013年 | 54篇 |
2012年 | 38篇 |
2011年 | 54篇 |
2010年 | 37篇 |
2009年 | 56篇 |
2008年 | 44篇 |
2007年 | 55篇 |
2006年 | 54篇 |
2005年 | 43篇 |
2004年 | 32篇 |
2003年 | 44篇 |
2002年 | 39篇 |
2001年 | 41篇 |
2000年 | 52篇 |
1999年 | 37篇 |
1998年 | 30篇 |
1997年 | 32篇 |
1996年 | 21篇 |
1995年 | 13篇 |
1994年 | 17篇 |
1993年 | 16篇 |
1992年 | 11篇 |
1991年 | 7篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1988年 | 7篇 |
1986年 | 1篇 |
1985年 | 6篇 |
1982年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有982条查询结果,搜索用时 265 毫秒
111.
Bulent?InancEmail author Azni?Idris Atsushi?Terazono Shin-ichi?Sakai 《Journal of Material Cycles and Waste Management》2004,6(2):97-103
This article briefly summarizes the limited landfill/dump information available for developing Asian countries, and introduces a database that aims to close the information gap through collecting and sharing data. Developing nations usually try to adapt the systems and technologies of developed countries. However, this approach may not be appropriate because of differences in socioeconomic, cultural, and political backgrounds. Many waste management projects fail after operations are transferred to local authorities owing to a lack of funds to cover the high operational expenses. Some successful projects have been adapted to local conditions, although the information on these successes is not often available for others. Nevertheless, only a few developing countries even have a national inventory of their dumps/landfills, and decision-makers have little awareness of the dumps and their impacts. The database introduced here will gather landfill/dump information from each country and organize it in a comparable format, and it will then be published on the Internet. 相似文献
112.
阐述了地表移动与变形预计理论在矿山开发项目环境影响评价工作中的必要性,着重介绍了典型曲线预计法建立的方法及预计的步骤. 相似文献
113.
The treatments of municipal solid waste (MSW) and the domestic sewage (DS) are critical issues of the current political and environment discussions. These concerns are due to the lack of dumping areas, the continuous increase of the population, and public health issues. The adequate treatment and management of MSW and DS can produce many benefits such as financial funds, heat and energy production, reduction of emissions and recuperation of water for reuse. Currently in Campinas MSW and DS are deposited in landfills or discharged into rivers and other sites. In the present study two scenarios are evaluated for the treatment of MSW and DS in Campinas: recycling with biological treatment and recycling with thermal treatment. The most suitable treatments for Campinas, based on the data from the present analysis and taking into consideration the local conditions, maximization of energy potential and environmental benefits, are incineration for the MSW and biological treatment for DS, both with energy recuperation. The main gains of this option are substantial environmental benefits, generated energy which can reach 18% of the total electrical energy consumed in Campinas while about 53% recuperation of the total amount of water treated for Campinas in 2010. 相似文献
114.
David Galán-Madruga 《环境科学学报(英文版)》2021,33(4):138-147
This work aims to provide a methodology framework which allows to improve the performance and efficiency of an air quality monitoring network (AQMN). It requires to be constituted by a minimum and reliable number of measurement sites. Nevertheless, the AQMN efficiency should be assessed over time, as a consequence of the possible emergence of new emission sources of air pollutants, which could lead to variations on their spatial distribution within the target area. PM10 particles data monitored by the Community of Madrid's (Spain) AQMN between 2008 and 2017 were used to develop a methodology to optimize the AQMN performance. The annual spatial distribution of average PM10 levels over the studied period monitored by all current stations vs those more representative was provided by a geographic information system (GIS), and the percentage of similarity between both postulates was quantified using simple linear regression (> 95%). As one innovative tool of this study, the practical application of the proposed methodology was validated using PM10 particles data measured by AQMN during 2007 and 2018, reaching a similitude degree higher than 95%. The influence of temporal variation on the proposed methodological framework was around 20%.The proposed methodology sets criteria for identifying non-redundant stations within AQMN, it is also able to appropriately assess the representativeness of fixed monitoring sites within an AQMN and it complements the guidelines set by European legislation on air pollutants monitoring at fixed stations, which could help to tackle efforts to improve the air quality management. 相似文献
115.
This paper focuses on the exergetic sustainability indicators of a medium-range commercial aircraft engine for constant reference environment and ground running conditions. First, a detailed exergy analysis of turbofan engine have been performed based on engine test cell parameters. Starting from the sustainability considerations and the second law of the thermodynamics, the paper presents six exergy-based sustainability indicators. The indicators of the turbofan engine developed here in conjunction with exergetic analysis and sustainable development are exergy efficiency, waste exergy ratio, exergy destruction factor, recoverable exergy rate, environmental effect factor, and exergetic sustainability index. The investigated sustainable indicators have been calculated by using exergy analysis outputs for aircraft ground running condition. Results from this study show that values of exergy efficiency, waste exergy ratio, exergy destruction factor, recoverable exergy rate, environmental effect factor, and exergetic sustainability index of investigated turbofan engine are found to be 0.315, 0.685, 0.408, 0, 2.174, and 0.460, respectively. These parameters are expected to quantify how the turbofan engine and aircraft become more environmentally benign and sustainable. 相似文献
116.
117.
118.
介绍了污水自动监测系统的基本组成及相对于传统采样监测的优势,并就系统在企业中的应用实例和取得的明显效果进行综述。 相似文献
119.
张雅琴 《辽宁城乡环境科技》2006,26(5):20-21
从环保审计的现状入手,分析目前企业环保审计难以向纵深发展的主要原因,提出实施企业环保审计的最佳切入点,将环保审计融入常规审计之中,并对环保审计提出配套的措施,确保环保审计适应现代化企业的发展。 相似文献
120.
/ The problem of assuring government operational continuity following earthquakes has been given little research attention. Recent earthquake experience has documented that government organizations without a public safety mission do incur damaged facilities and routinely see increases in public demands following an earthquake. Impediments to service delivery associated with such dam-ages can be minimized if agencies address earthquake plan elements likely to enhance postimpact functioning, including: the potential to relocate operations, protection for the workplace, possession of an organizational inventory, emergency instructions for employees, the ability to use volunteers, and communication capacity. Factors associated with the adoption of these plan elements were studied in one county government and its municipal county seat in the southwestern United States. A census of departments within these jurisdictions was asked to complete a questionnaire reporting the level of planning activity relative to each of these plan elements. It was found that the overall level of preparedness was low, but statistically significantly related to agency size, perceived risk, and information seeking. The implications of these findings underscore the potential for disruption to government service delivery and permit the identification of potential avenues for increasing levels of preparedness.KEY WORDS: Emergency planning; Earthquakes; Government preparedness 相似文献