全文获取类型
收费全文 | 5615篇 |
免费 | 656篇 |
国内免费 | 842篇 |
专业分类
安全科学 | 2004篇 |
废物处理 | 476篇 |
环保管理 | 633篇 |
综合类 | 2640篇 |
基础理论 | 352篇 |
环境理论 | 4篇 |
污染及防治 | 457篇 |
评价与监测 | 381篇 |
社会与环境 | 100篇 |
灾害及防治 | 66篇 |
出版年
2024年 | 12篇 |
2023年 | 81篇 |
2022年 | 150篇 |
2021年 | 200篇 |
2020年 | 199篇 |
2019年 | 185篇 |
2018年 | 152篇 |
2017年 | 231篇 |
2016年 | 241篇 |
2015年 | 335篇 |
2014年 | 326篇 |
2013年 | 394篇 |
2012年 | 541篇 |
2011年 | 488篇 |
2010年 | 337篇 |
2009年 | 369篇 |
2008年 | 215篇 |
2007年 | 357篇 |
2006年 | 389篇 |
2005年 | 270篇 |
2004年 | 208篇 |
2003年 | 227篇 |
2002年 | 200篇 |
2001年 | 179篇 |
2000年 | 178篇 |
1999年 | 137篇 |
1998年 | 122篇 |
1997年 | 102篇 |
1996年 | 88篇 |
1995年 | 53篇 |
1994年 | 45篇 |
1993年 | 31篇 |
1992年 | 23篇 |
1991年 | 13篇 |
1990年 | 14篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1973年 | 1篇 |
排序方式: 共有7113条查询结果,搜索用时 15 毫秒
131.
天然气压缩机站的安全生产管理 总被引:1,自引:0,他引:1
天然气压缩机组目前在油田的注气采油,增压外输等方面发挥着越来越重要的作用。在压缩机站的生产管理中,安全管理非常重要,建立健全安全规范将对压缩机站的安全运行提供保证。本文主要从油水管理,操作规程,容器管网,安全教育等方面进行阐述。 相似文献
132.
133.
134.
为了探讨玻璃纤维过滤器处理含DEP雾废气的效率问题,在实验室进行了DEP雾去除实验。考查了不同气体入口浓度、过滤流速下玻璃纤维过滤捕集装置对含DEP雾废气的净化能力,结果表明:利用玻璃纤维过滤器去除DEP雾,在DEP雾粒径主要分布为0.48~3.4μm之间,DEP雾浓度小于220 mg/m3,过滤流速小于10 cm/s情况下,玻璃纤维过滤器对DEP雾的去除率大于99%,最大气体流量下的压力降小于1610Pa;同时对含油(酸)雾废气除雾效果好,特别是对于粒径特别细微的油(酸)雾,捕集效率也很高,还可回收利用,不会产生二次污染。 相似文献
135.
Major mining companies have recently embraced the sustainable development paradigm, in seeking to improve their competitiveness and increase shareholder returns. Successful mine closure is one important element of this process. Improved performance in this area is essential if surrounding communities are to see mining companies as responsible corporate and social partners.
In Indonesia, the new approach has coincided with the development of specific mine closure legislation. To facilitate the legislation, a consortium of mining companies joined to form the Industry Mine Closure Steering Committee. This Committee has lobbied the Government, actively negotiating to incorporate sustainable development ideals and practices into the new legislation. The Committee's aim has been to foster continued development of the mining industry, while taking account of variation in environmental, social and community conditions. In describing the process, this article seeks to provide guidance for the development of mine closure legislation in other nations. 相似文献
In Indonesia, the new approach has coincided with the development of specific mine closure legislation. To facilitate the legislation, a consortium of mining companies joined to form the Industry Mine Closure Steering Committee. This Committee has lobbied the Government, actively negotiating to incorporate sustainable development ideals and practices into the new legislation. The Committee's aim has been to foster continued development of the mining industry, while taking account of variation in environmental, social and community conditions. In describing the process, this article seeks to provide guidance for the development of mine closure legislation in other nations. 相似文献
136.
137.
138.
现代电化学技术与环境保护 总被引:2,自引:0,他引:2
介绍了电化学技术在清洁工艺的开发、清洁产品的制备、废水与废气的处理、被污染土壤的修复和环境污染物监测方面的应用情况。电化学技术具有能量利用率高、经济实用以及污染物产生量少或污染物去除率高等特点,在环境保护领域具有广阔的应用前景。 相似文献
139.
140.
Open-cast lignite mining in the Lusatian mining district resulted in rehabilitated mine soils containing up to four organic matter types: (1) recent plant litter, (2) lignite deposited by mining activity, (3) carbonaceous ash particles deposited during amelioration of the lignite-containing parent substrate and (4) airborne carbonaceous particles deposited during contamination. The influence of lignite-derived carbon types on the organic matter development and their role in the soil carbon cycle was unknown. This paper presents the findings obtained during a six year project concerning the impact of lignite on soil organic matter composition and the biogeochemical functioning of the ecosystem. The organic matter development after rehabilitation was followed in a chronosequence of rehabilitated mine soils afforested in 1966, 1981 and 1987. A differentiation of the organic matter types and an evaluation of their role within the ecosystem was achieved by the use of 14C activity measurements, 13C CPMAS NMR spectroscopy and wet chemical analysis of plant litter compounds. The results showed that the amount and degree of decomposition of the recent organic matter derived from plant material of the 30 year old mine soil was similar to natural uncontaminated forest soil which suggests complete rehabilitation of the ecosystem. The decomposition and humification processes were not influenced by the presence of lignite. On the other hand it was shown that lignite, which was thought to be recalcitrant because of its chemical structure, was part of the carbon cycle in these soils. This demonstrates the need to elucidate further the stabilisation mechanisms of organic matter in soils. 相似文献