全文获取类型
收费全文 | 10674篇 |
免费 | 981篇 |
国内免费 | 1187篇 |
专业分类
安全科学 | 1207篇 |
废物处理 | 152篇 |
环保管理 | 2670篇 |
综合类 | 5717篇 |
基础理论 | 977篇 |
环境理论 | 66篇 |
污染及防治 | 485篇 |
评价与监测 | 682篇 |
社会与环境 | 797篇 |
灾害及防治 | 89篇 |
出版年
2024年 | 49篇 |
2023年 | 148篇 |
2022年 | 197篇 |
2021年 | 326篇 |
2020年 | 330篇 |
2019年 | 339篇 |
2018年 | 310篇 |
2017年 | 573篇 |
2016年 | 600篇 |
2015年 | 598篇 |
2014年 | 499篇 |
2013年 | 794篇 |
2012年 | 760篇 |
2011年 | 744篇 |
2010年 | 613篇 |
2009年 | 565篇 |
2008年 | 396篇 |
2007年 | 637篇 |
2006年 | 638篇 |
2005年 | 583篇 |
2004年 | 508篇 |
2003年 | 474篇 |
2002年 | 357篇 |
2001年 | 347篇 |
2000年 | 344篇 |
1999年 | 232篇 |
1998年 | 171篇 |
1997年 | 146篇 |
1996年 | 105篇 |
1995年 | 124篇 |
1994年 | 69篇 |
1993年 | 67篇 |
1992年 | 42篇 |
1991年 | 26篇 |
1990年 | 22篇 |
1989年 | 16篇 |
1988年 | 10篇 |
1986年 | 7篇 |
1984年 | 5篇 |
1982年 | 5篇 |
1981年 | 6篇 |
1980年 | 6篇 |
1979年 | 9篇 |
1978年 | 4篇 |
1977年 | 7篇 |
1976年 | 5篇 |
1975年 | 6篇 |
1974年 | 4篇 |
1973年 | 5篇 |
1972年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
景观生态学在建设项目生态环境影响评价中的应用 总被引:13,自引:0,他引:13
景观生态学目前是国家环境保护总局《非污染生态影响评价技术导则》引入的概念框架和理论方法。本文通过景观生态学在不同性质建设项目中的运用分析,进行了一定的尝试,更加希望在今后建设项目生态环境影响评价工作中得到修正和完善。 相似文献
992.
公众参与市容环境规划与管理的方法设计--以南京市的实践为例 总被引:1,自引:0,他引:1
市容环境是与公众生活联系最为紧密的领域,也是公众参与最容易进行的领域。南京的城市建设要实现“经济发达、环境优美、融古都特色和现代文明于一体的现代化江滨城市”的目标,公众参与市容环境的规划与管理是关键内容之一。论文以“南京市市容环境卫生发展规划”项目工作为基础,分析和阐述公众参与的内涵,提出公众参与市容环境的五大步骤,并针对南京市容环境方面的具体案例,设计出符合南京特色的公众参与市容环境规划与管理的方法框架模型,包括决策模式、制度框架的共管体系。 相似文献
993.
994.
刘昕 《中国环境管理干部学院学报》2003,13(4):21-23
创建国家环保模范城市是提高城市管理水平,改善城市环境质量,实施城市经济可持续发展的重要举措,本文结合秦皇岛市创建国家环保工作的当前进展,客观分析总结了创建工作存在的差距和面临的任务,对下步工作提出了意见和建议。 相似文献
995.
长江流域生态环境的意义及生态功能区段的划分 总被引:15,自引:3,他引:12
虞孝感 《长江流域资源与环境》2002,11(4):323-326
中国加入WTO之后,中国经济进一步与国际市场接轨,融入世界经济体系,机遇和挑战同在。欧美各国近年大力推行的环境标志产品认证,对第三世界商品质量设置入关的环境门槛。长江产业带作为世界最大的内河产业带和制造业基地,现在世界通行的环境管理认证体系和环境标志产品的认证,对长江流域产业尤其是外贸出口产业有长远而深刻的影响。这种认证制度,一方面对我出口商品设置了新的障碍,另一方面又将环境保护压力直接施加到企业。重视流域生态环境将从政府行为、公民压力扩展到企业行动,由于流域生态环境的负荷愈来愈重,流域生态环境的自我调节和恢复功能大幅下降,引起了日益严重的流域性生态安全问题。根据长江流域生态环境特征、不同的生态功能及存在的主要生态安全问题,将长江流域划性生态安全问题。根据长江流域生态环境特征、不同的生态功能及存在的主要生态安全问题,将长江流域划分成以下五个不同的生态功能区段,即长江源地区、金少江段(直门达至宜宾)、长江上游段(宜宾至宜昌)、长江中游段(宜昌至湖口段)、长江下游段(湖口至入海口)。针对不同区段主要的生态安全问题,应因地制宜采取相应的防范和整治措施。为保护与恢复生态功能服务。 相似文献
996.
The production of large quantities of wastes globally has created a commercial activity involving the transfrontier shipments
of hazardous wastes, intended to be managed at economically attractive waste-handling facilities located elsewhere. In fact,
huge quantities of hazardous wastes apparently travel the world in search of “acceptable” waste management facilities. For
instance, within the industrialized countries alone, millions of tonnes of potentially hazardous waste cross national frontiers
each year on their way for recycling or to treatment, storage, and disposal facilities (TSDFs) because there is no local disposal
capacity for these wastes, or because legal disposal or reuse in a foreign country may be more environmentally sound, or managing
the wastes in the foreign country may be less expensive than at home. The cross-boundary traffic in hazardous wastes has lately
been under close public scrutiny, however, resulting in the accession of several international agreements and laws to regulate
such activities. This paper discusses and analyzes the most significant control measures and major agreements in this new
commercial activity involving hazardous wastes. In particular, the discussion recognizes the difficulties with trying to implement
the relevant international agreements among countries of vastly different socioeconomic backgrounds. Nonetheless, it is also
noted that global environmental agreements will generally be a necessary component of ensuring adequate environmental protection
for the world community—and thus a need for the careful implementation of such agreements and regulations. 相似文献
997.
Sakai Y Shoji R Kim BS Sakoda A Suzuki M 《Environmental monitoring and assessment》2001,70(1-2):57-70
Among bioassays for evaluating various impacts of chemicalson humans and ecosystems, those based on culturedmammalian-cells can best predict acute lethal toxicity to humans. Weexpect them to be employed in the future in environmentalrisk management alongside mutagenicity tests and endocrine-disrupting activity tests. We recently developed adisposable bioassay device that immobilizes humanhepatocarcinoma cells in a small micropipette tip. Thisenables very quick (within 2 h) evaluation of acute lethaltoxicity to humans. For bioassay-based environmentalmanagement, 2 promising approaches have been demonstrated bythe US-EPA: toxicity identification evaluation (TIE) andtoxicity reduction evaluation (TRE). The Japanese Ministryof Environment has been supporting a multi-center validationproject, aimed at assembling a bioassay database. To makefull use of these resources, we present a numerical modelthat describes contribution of individual chemical toobserved toxicity. This will allow the selection of the mosteffective countermeasure to reduce the toxicity. Bioassay-based environmental risk management works retrospectively,whereas impact assessment using substance flow models andtoxicity databases works prospective. We expect that these 2approaches will exchange information, act complementarily,and work effectively in keeping our environment healthy inthe 21st century. 相似文献
998.
P. Gyau-Boakye 《Environment, Development and Sustainability》2001,3(1):17-29
The Akosombo dam was constructed on the Volta river primarily for the generation of hydropower. The resultant Volta lake which was formed between 1962 and 1966 in Ghana will probably long be one of the greatest man-made lakes. It produces 912MW of electricity at its maximum operating capacity. The Akosombo hydroelectric project (HEP) was meant among others to open up Ghana to rapid industrialization and hence modern development. Other positive impacts of the HEP include fishing, farming, transportation and tourism. However, there are equally negative impacts, some of which the project did not envisage and these are felt on the physical, biological and human subsystems within the immediate project environments and places much more distant from them. Recently, there have been declines in the lake levels resulting most probably from inadequate rainfall and/or runoff from the river catchments that feed the lake, and also from the observed rising temperatures. Comparisons of the runoff from two most important tributaries of the Volta (White Volta and Oti) for two time periods of 1951–1970 and 1971–1990 showed reductions in mean streamflows of 23.1% on the White Volta and 32.5% on the Oti. Similarly, a plot of the mean annual temperatures for the upper Volta basin indicated a 1^C rise in temperature from 1945–1993. 相似文献
999.
It is now part of received wisdom that humanitarian assistance in conflict and post-conflict situations may be ineffective or even counterproductive in the absence of an informed understanding of the broader political context in which so-called 'complex political emergencies' (CPEs) occur. Though recognising that specific cases have to be understood in their own terms, this article offers a framework for incorporating political analysis in policy design. It is based on a programme of research on a number of countries in Africa and Asia over the last four years. It argues that the starting-point should be an analysis of crises of authority within contemporary nation-states which convert conflict (a feature of all political systems) into violent conflict; of how such conflict may in turn generate more problems for, or even destroy, the state; of the deep-rooted political, institutional and developmental legacies of political violence; and of the difficulties that complicate the restoration of legitimate and effective systems of governance after the 'termination' of conflict. It then lists a series of questions which such an analysis would need to ask--less in order to provide a comprehensive check-list than to uncover underlying political processes and links. It is hoped these may be used not only to understand the political dynamics of emergencies, but also to identify what kinds of policy action should and should not be given priority by practitioners. 相似文献
1000.