全文获取类型
收费全文 | 89486篇 |
免费 | 1222篇 |
国内免费 | 1084篇 |
专业分类
安全科学 | 3708篇 |
废物处理 | 3268篇 |
环保管理 | 13755篇 |
综合类 | 21038篇 |
基础理论 | 26161篇 |
环境理论 | 71篇 |
污染及防治 | 14218篇 |
评价与监测 | 5378篇 |
社会与环境 | 3667篇 |
灾害及防治 | 528篇 |
出版年
2022年 | 797篇 |
2021年 | 796篇 |
2020年 | 645篇 |
2019年 | 857篇 |
2018年 | 1118篇 |
2017年 | 1165篇 |
2016年 | 2159篇 |
2015年 | 1825篇 |
2014年 | 2575篇 |
2013年 | 9244篇 |
2012年 | 2153篇 |
2011年 | 2382篇 |
2010年 | 3285篇 |
2009年 | 3368篇 |
2008年 | 1901篇 |
2007年 | 1749篇 |
2006年 | 2173篇 |
2005年 | 2183篇 |
2004年 | 2511篇 |
2003年 | 2334篇 |
2002年 | 1893篇 |
2001年 | 2222篇 |
2000年 | 1972篇 |
1999年 | 1488篇 |
1998年 | 1361篇 |
1997年 | 1351篇 |
1996年 | 1477篇 |
1995年 | 1566篇 |
1994年 | 1472篇 |
1993年 | 1330篇 |
1992年 | 1315篇 |
1991年 | 1289篇 |
1990年 | 1221篇 |
1989年 | 1214篇 |
1988年 | 1042篇 |
1987年 | 980篇 |
1986年 | 985篇 |
1985年 | 1055篇 |
1984年 | 1153篇 |
1983年 | 1162篇 |
1982年 | 1170篇 |
1981年 | 1091篇 |
1980年 | 942篇 |
1979年 | 917篇 |
1978年 | 820篇 |
1977年 | 714篇 |
1976年 | 637篇 |
1975年 | 601篇 |
1973年 | 629篇 |
1972年 | 634篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
981.
Cary T. Chiou 《Environment international》1980,4(1):15-19
Considerations are given to the simultaneous evaporation of both components in a miscible (binary) solution based on the properties of related components. Rates of evaporation of several binary systems of nonpolar organics and of polar organics with water in unstirred solutions were determined and interpreted using the model previously proposed. This study presents an approach to assess the evaporative loss of the volatile solute and solvent components from a (miscible) solution that may become a source of concern as a health risk. 相似文献
982.
Substantial progress has been made in the production of environmental level, natural matrix, radioactivity standards of soil of low organic and low carbonate content, and of human lung and human liver. This is in response to the deliberations of the 1977 ICRM meeting at which the need for such standards was voiced and the criteria suggested. The soil samples have been reduced to optimum particle size and are ready for blending and standardization. A ten year supply of this standard should be ready in a year or less. Reducing the dried lung and liver to less than 74 μm has proven formidable because of the natural fat and oil content. Using cyrogenic milling techniques more than three quarters of the total mass of each has been reduced to the desired particle size; the balance will either be reduced or removed and we can then proceed to the final standardization. 相似文献
983.
984.
985.
986.
987.
988.
989.
Christopher C. Lutes Robert S. Truesdale Brian W. Cosky John H. Zimmerman Brian A. Schumacher 《补救:环境净化治理成本、技术与工艺杂志》2015,25(4):7-26
This article summarizes a long‐term study of vapor intrusion mitigation system performance in a historic, unoccupied residential duplex with an extensive set of temporal variability observations. The experimental design included multiple cycles of subslab depressurization (SSD) system operation and shut‐off during a seven‐month period, followed by a year‐long period of continuous operation. Results showed that the system provided rapid pressure field extension and radon control as much as 100 days of operation before optimum volatile organic compound (VOC) mitigation was achieved. Greater variability in VOC concentrations than in radon concentrations was observed during the initial mitigation system cycling. Subslab VOC concentrations at numerous locations increased during this initial period of SSD operation, and indoor air VOC concentrations were more variable than radon. However, indoor air concentrations were considerably less variable (and lower) during the first year of continuous mitigation system operation. ©2015 Wiley Periodicals, Inc. 相似文献
990.
R.P. Beaven K. Knox J.R. Gronow O. Hjelmar D. Greedy H. Scharff 《Waste management (New York, N.Y.)》2014,34(7):1191-1198
The key aspects of landfill operation that remain unresolved are the extended timescale and uncertain funding of the post-closure period. This paper reviews the topic and proposes an economic instrument to resolve the unsustainable nature of the current situation. Unsustainability arises from the sluggish degradation of organic material and also the slow flushing of potential pollutants that is exacerbated by low-permeability capping. A landfill tax or aftercare provision rebate is proposed as an economic instrument to encourage operators to actively advance the stabilization of landfilled waste. The rebate could be accommodated within existing regulatory and tax regimes and would be paid for: (i) every tonne of nitrogen (or other agreed leachate marker) whose removal is advanced via the accelerated production and extraction of leachate; (ii) every tonne of non-commercially viable carbon removed via landfill gas collection and treatment. The rebates would be set at a level that would make it financially attractive to operators and would encourage measures such as leachate recirculation, in situ aeration, and enhanced flushing. Illustrative calculations suggest that a maximum rebate of up to ~€50/tonne MSW would provide an adequate incentive. 相似文献