全文获取类型
收费全文 | 25532篇 |
免费 | 251篇 |
国内免费 | 208篇 |
专业分类
安全科学 | 679篇 |
废物处理 | 1046篇 |
环保管理 | 3248篇 |
综合类 | 4333篇 |
基础理论 | 6944篇 |
环境理论 | 11篇 |
污染及防治 | 6453篇 |
评价与监测 | 1649篇 |
社会与环境 | 1460篇 |
灾害及防治 | 168篇 |
出版年
2022年 | 212篇 |
2021年 | 184篇 |
2020年 | 164篇 |
2019年 | 187篇 |
2018年 | 334篇 |
2017年 | 356篇 |
2016年 | 523篇 |
2015年 | 427篇 |
2014年 | 671篇 |
2013年 | 1961篇 |
2012年 | 791篇 |
2011年 | 1099篇 |
2010年 | 932篇 |
2009年 | 977篇 |
2008年 | 1109篇 |
2007年 | 1154篇 |
2006年 | 975篇 |
2005年 | 854篇 |
2004年 | 801篇 |
2003年 | 813篇 |
2002年 | 769篇 |
2001年 | 1027篇 |
2000年 | 753篇 |
1999年 | 436篇 |
1998年 | 285篇 |
1997年 | 338篇 |
1996年 | 346篇 |
1995年 | 400篇 |
1994年 | 388篇 |
1993年 | 319篇 |
1992年 | 313篇 |
1991年 | 324篇 |
1990年 | 337篇 |
1989年 | 322篇 |
1988年 | 251篇 |
1987年 | 262篇 |
1986年 | 256篇 |
1985年 | 233篇 |
1984年 | 244篇 |
1983年 | 230篇 |
1982年 | 222篇 |
1981年 | 215篇 |
1980年 | 194篇 |
1979年 | 219篇 |
1978年 | 161篇 |
1977年 | 178篇 |
1975年 | 150篇 |
1974年 | 139篇 |
1973年 | 157篇 |
1972年 | 143篇 |
排序方式: 共有10000条查询结果,搜索用时 616 毫秒
611.
Ernest J. Kulik Joseph P. Lingle Thomas A. Nowlan Rickie G. Nesbit 《补救:环境净化治理成本、技术与工艺杂志》1996,6(4):51-66
For both private corporations and military branches, downsizing and consolidation are becoming more commonplace. A range of environmental concerns must be addressed to effectively implement a consolidation program. A facility deactivation program can often become a minefield for an organization. Responsible personnel are typically inexperienced with the process, and this can lead to costly mistakes. This article provides insight into this topic based on experience gained with a multifacility program and related environmental issues. It emphasizes the importance of detailed, up-front, proactive project planning; a solid program management system; and accurate identification of project objectives and deliverables. 相似文献
612.
Robert B. Olshansky 《Environmental management》1996,20(1):11-23
The California Environmental Quality Act (CEQA) has evolved from a mini-NEPA, first enacted in 1970, into a procedural act
that affects the approval process of all large developments in California. In 1990, California local governments produced
over 1600 environmental impact reports and 30,000 initial studies under CEQA. Because of its widespread use, CEQA has periodically
drawn the attention of the state legislature, most recently in 1993, when over 60 CEQA reform bills were introduced. This
paper describes the CEQA process and evaluates its success at meeting its explicit and implicit goals. The research includes
a statewide survey of CEQA practice, sent to the planning departments of all 513 local governments in California in 1991.
Survey respondents agreed that CEQA helps in evaluating environmental impacts, reducing impacts, informing the public, and
coordinating public agency review. It is effective in reducing the environmental impacts of individual projects, but is not
as effective in improving environmental quality on an areawide scale. This research concludes that CEQA has led to positive
outcomes and is not as deeply flawed as many of its critics claim. Still, CEQA as currently designed may not be the optimal
vehicle for ensuring environmental quality. 相似文献
613.
Katie D. Smythe J. Christopher Bernabo Thomas B. Carter Peter R. Jutro 《Environmental management》1996,20(6):865-872
The project on Biodiversity Uncertainties and Research Needs (BURN) ensures the advancement of usable knowledge on biodiversity by obtaining input from decision makers on their priority information needs about biodiversity and then using this input to engage leading scientists in designing policy-relevant research. Decision makers articulated concerns related to four issues: significance of biodiversity; status and trends of biodiversity; management for biodiversity; and the linkage of social, cultural, economic, legal, and biological objectives. Leading natural and social scientists then identified the research required to address the decision makers' needs and determined the probability of success. The diverse group of experts reached consensus on several fundamental issues, helping to clarify the role of biodiversity in land and resource management. The BURN participants identified several features that should be incorporated into policy-relevant research plans and management strategies for biodiversity. Research and assessment efforts should be: multidisciplinary and integrative, participatory with stakeholder involvement, hierarchical (multiple scales), and problem- and region-specific. The activities should be focused regionally within a global perspective. Meta-analysis of existing data is needed on all fronts to assess the state of the science. More specifically, the scientists recommended six priority research areas that should be pursued to address the information needs articulated by decision makers: (1) characterization of biodiversity, (2) environmental valuation, (3) management for sustainability—for humans and the environment (adaptive management), (4) information management strategies, (5) governance and stewardship issues, and (6) communication and outreach. Broad recommendations were developed for each research area to provide direction for research planning and resource management strategies. The results will directly benefit those groups that require biodiversity research to address their needs—whether to develop policy, manage natural resources, or make other decisions affecting biodiversity. 相似文献
614.
In 1995 the authors spent a considerable amount of time conducting audits and audit training classes all over the world. In rolling out Colgate-Palmolive's reengineered environmental audit program, they coupled a two-day training program with a three-day audit. Whether in Asia-Pacific, South America, Europe, or the United States, auditors, especially those newly trained, always seemed to fall into the same traps time and again. In order to facilitate the learning process, the authors prepared a list of 20 tips to use at the beginning and end of all training programs and audits. In this article, the authors share the 20 “golden rules” to help all auditors improve the quality of their audits. 相似文献
615.
616.
Frank A. Ward Thomas P Lynch 《Journal of the American Water Resources Association》1996,32(6):1127-1138
ABSTRACT: This paper presents an integrated optimal control model that optimizes economic performance of reservoir management in watersheds in which there are significant economic and hydrologic interdependencies. The model is solved using the General Algebraic Modeling System (GAMS). Results show that application of this model to New Mexico's Rio Chama basin can increase total system benefits over historical benefits by exploiting complementarities between hydroelectricity production, instream recreation, and downstream lake recreation. 相似文献
617.
618.
619.
Jiří Pšeja Josef Hrnčiřík Jan Kupec Hana Charvátová Petr Hruzík Michael Tupý 《Journal of Polymers and the Environment》2006,14(3):231-237
Biodegradability testing was performed in an aqueous environment under anaerobic conditions after inoculation with digested sludge from municipal wastewater treatment plant. In cross-linking with 1,2:3,4-diepoxybutane in limits 0.8–9.1% weight, biodegradability degree decreased from 76.8 to 62.2%; when 1,2:7,8 diepoxyoctane in quantities 1.1–13.2% weight was used, biodegradability degree dropped more prominently – from 72.3 to 22.8%. There is obviously a direct connection between growing cross-link degree (assessed by so-called fixation index) and decreasing readiness to biodegradation, apparently owing to build-up of a network forming an obstacle to access of micro-organisms and enzymes. 相似文献
620.