全文获取类型
收费全文 | 20643篇 |
免费 | 191篇 |
国内免费 | 203篇 |
专业分类
安全科学 | 537篇 |
废物处理 | 1000篇 |
环保管理 | 2516篇 |
综合类 | 2712篇 |
基础理论 | 5349篇 |
环境理论 | 4篇 |
污染及防治 | 5659篇 |
评价与监测 | 1668篇 |
社会与环境 | 1463篇 |
灾害及防治 | 129篇 |
出版年
2023年 | 94篇 |
2022年 | 217篇 |
2021年 | 218篇 |
2020年 | 139篇 |
2019年 | 181篇 |
2018年 | 333篇 |
2017年 | 329篇 |
2016年 | 535篇 |
2015年 | 375篇 |
2014年 | 580篇 |
2013年 | 1776篇 |
2012年 | 688篇 |
2011年 | 875篇 |
2010年 | 813篇 |
2009年 | 796篇 |
2008年 | 895篇 |
2007年 | 1007篇 |
2006年 | 885篇 |
2005年 | 730篇 |
2004年 | 730篇 |
2003年 | 715篇 |
2002年 | 674篇 |
2001年 | 916篇 |
2000年 | 633篇 |
1999年 | 396篇 |
1998年 | 275篇 |
1997年 | 250篇 |
1996年 | 294篇 |
1995年 | 273篇 |
1994年 | 258篇 |
1993年 | 238篇 |
1992年 | 246篇 |
1991年 | 211篇 |
1990年 | 218篇 |
1989年 | 223篇 |
1988年 | 197篇 |
1987年 | 166篇 |
1986年 | 130篇 |
1985年 | 141篇 |
1984年 | 172篇 |
1983年 | 154篇 |
1982年 | 197篇 |
1981年 | 135篇 |
1980年 | 121篇 |
1979年 | 156篇 |
1978年 | 118篇 |
1977年 | 108篇 |
1976年 | 102篇 |
1975年 | 83篇 |
1974年 | 89篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
941.
942.
A feature of the 63rd annual meeting of the Air Pollution Control Association, held June 14–18, 1970 in St. Louis, was a plenary session on national emission standards. Presided over by John S. Lagarias, APCA past president, the session explored the theme for both motor vehicles and stationary sources through the presentations of Delbert S. Barth and Arthur C. Stern and the discussions of John A. Maga and Robert L. Harris, Jr. The essence of their remarks appears on the following pages. 相似文献
943.
Donald S. Shepard 《Journal of the Air & Waste Management Association (1995)》2013,63(11):756-761
Load-shifting, a relatively inexpensive approach to air pollution control, involves transferring the generating load from one power plant to another according to meteorological conditions. In this paper, an atmospheric dispersion model is adapted to estimate the exposure of the urban population to sulfur dioxide from operating the power system in different ways. Then a mathematical model of the power system of a metropolitan area is constructed to determine the reduction in pollution exposure which could be achieved, and the costs involved. As a case study, the application of the model to St. Louis, Missouri, is simulated. Under favorable conditions, load shifting could reduce pollution exposure up to 95%, while increasing the costs of electric power generation by only 4%. The load-shifting model has use not only as an operational control strategy, but also as an analytical tool to evaluate alternative pollution control measures in the electric power industry. 相似文献
944.
Seymour Calvert Dale Lundgren Dilip S. Mehta 《Journal of the Air & Waste Management Association (1995)》2013,63(7):529-532
The object of this program was to study particle collection efficiency in venturi scrubbers in order to account for the effects of particle size and wettability, venturi size, and fluid flow rates. The body of information is directed to those interested in the prediction of particle collection efficiency in venturi scrubbers. 相似文献
945.
N.C.G. Freeman T. Wainman P.J. Lioy A.H. Stern S.I. Shupack 《Journal of the Air & Waste Management Association (1995)》2013,63(8):604-605
Honorary Memberships are conferred by the Air Pollution Control Association on persons of widely recognized eminence in some part of the field of air pollution control or who have rendered especially meritorious service to the Association. Honorary Memberships were awarded this year to Dr. Leonard Greenburg and Mr. Milton Reizenstein, both past presidents of APCA. 相似文献
946.
Keshava S. Murthy Harvey S. Rosenberg Richard B. Engdahl 《Journal of the Air & Waste Management Association (1995)》2013,63(9):851-855
Fourteen sulfur and/or sulfuric acid producing regenerate FGD processes were discussed at the 1974 FGD Symposium in Atlanta. During the period elapsed since then, considerable status change has occurred on many of these regenerable processes. Other regenerable processes which were not as well known during 1974 have surfaced in 1975. The problems of obtaining reducing gases (hydrogen sulfide, carbon monoxide, and hydrogen) for the reduction of sulfur dioxide product streams to elemental sulfur have become severe due to shortages of natural gas or other petroleum based feedstock. A new sulfur producing process which employs CO and H2 directly (rather than the H2S required for liquid and vapor base Claus reactions) is gaining attention. This paper discusses briefly: (1) the announced status of the many regenerable FGD processes, (2) the problem of reductant gas supply, and (3) the effect on FGD processes of using coal based reducing gas instead of reformed natural gas. 相似文献
947.
Hans T. Karlsson Harvey S. Rosenberg 《Journal of the Air & Waste Management Association (1995)》2013,63(7):822-826
This is the conclusion of a 2-part article dealing with the technical aspects of lime/limestone scrubbers for coal-fired power plants, it covers instrumentation, participate removal and sludge disposal. Part I (June JAPCA) covered process chemistry and scrubber systems 相似文献
948.
Mario C.R. Vidal Paulo V.R. Carvalho Marcello S. Santos Isaac J.L. dos Santos 《Journal of Loss Prevention in the Process Industries》2009,22(4):516-527
This article aims to describe the characteristics of collective working situations in complex systems – especially those in nuclear power plants – related to common forms of cooperation, in order to improve systems resilience. In addition, we will try to detail some aspects of collective working situations, emphasizing the differences between various forms of control. The similarities between work activities (multi-addressed messages, linkage to regulation, central and peripheral information) are nonetheless exposed. We conclude by proposing a contribution to support systems design, thus facilitating cooperation in teamwork activities. 相似文献
949.
Experimental study on the influence mechanism of gas seepage on coal and gas outburst disaster 总被引:1,自引:0,他引:1
By using the self-developed triaxial servo-controlled seepage equipment for thermo-fluid-solid coupling of coal containing gas and the self-developed coal and gas outburst simulation test device, experiments to study the influence mechanism of gas seepage on coal and gas outburst disasters. The results show that: (i) gas seepage decreases the strength of coal containing gas and accelerates its failure process; (ii) under the same gas pressure, the confining pressure is larger, the more difficult the gas flows and the greater the intensity of coal containing gas is; (iii) in the process of coal and gas outburst, the greater the vertical ground stress is, the more powerful the outburst will be; (iv) the influence mechanism of gas seepage on coal and gas outburst disasters is as follows: firstly, gas seepage weakens the mechanical properties of coal body, which makes it much easier for coal and gas outburst to occur; secondly, on the same effect of external force, it will be easy to form a high gas pressure zone in the coal body under the difficult condition of gas seepage, and accumulate more gas compression energy, which is the energy source for coal and gas outburst, and it is also the main dynamic source to throw and grind the coal. 相似文献
950.
This paper presents the design and the implementation of a methodology for measuring and improving safety culture at a nuclear power plant (NPP). The study has involved the completion of a pilot project aimed at seeing how to make use of the RADAR logic (Results, Approach, Deployment, Assessment and Review) of the EFQM model as a tool for the self assessment of safety culture in a nuclear power plant. The work was aimed at finding evidence of the safety culture that was in place at the plant and at identifying both the strengths of that culture and any areas in which it could be improved. The score obtained from an analysis of those strengths and areas for improvement has made it possible to prioritise the actions to be taken. The identification of perceptions and evidence, the agreement on the strong points and areas for improvement and the quantification of the safety culture have been performed by groups comprising volunteers who work at the NPP. The advantages of this methodology are assessed in the paper. 相似文献