全文获取类型
收费全文 | 1658篇 |
免费 | 133篇 |
国内免费 | 203篇 |
专业分类
安全科学 | 336篇 |
废物处理 | 15篇 |
环保管理 | 350篇 |
综合类 | 761篇 |
基础理论 | 191篇 |
污染及防治 | 60篇 |
评价与监测 | 85篇 |
社会与环境 | 116篇 |
灾害及防治 | 80篇 |
出版年
2024年 | 3篇 |
2023年 | 15篇 |
2022年 | 37篇 |
2021年 | 60篇 |
2020年 | 58篇 |
2019年 | 64篇 |
2018年 | 49篇 |
2017年 | 69篇 |
2016年 | 83篇 |
2015年 | 64篇 |
2014年 | 84篇 |
2013年 | 110篇 |
2012年 | 111篇 |
2011年 | 119篇 |
2010年 | 80篇 |
2009年 | 93篇 |
2008年 | 63篇 |
2007年 | 120篇 |
2006年 | 122篇 |
2005年 | 94篇 |
2004年 | 70篇 |
2003年 | 65篇 |
2002年 | 53篇 |
2001年 | 54篇 |
2000年 | 33篇 |
1999年 | 38篇 |
1998年 | 40篇 |
1997年 | 19篇 |
1996年 | 15篇 |
1995年 | 20篇 |
1994年 | 17篇 |
1993年 | 17篇 |
1992年 | 16篇 |
1991年 | 15篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1973年 | 2篇 |
1969年 | 1篇 |
排序方式: 共有1994条查询结果,搜索用时 125 毫秒
991.
重大灾害对社会经济和生命财产安全都存在严重的影响,而灾区人们的心理变化和行为反应,与社会整体的抗灾救灾效果都具有较大的关联性。该文探讨重大灾害后心理干预行为教育对策,针对灾害对灾区人们产生的心理应激障碍问题,采用叙事疗法按照构建契约、故事重建、制图、探险、结束和复查五步骤,将灾区受灾人群从不良的生活模式中唤醒,并通过体育干预从主体、个体、群体三个角度指引灾区人群,建立正确、积极的人生价值观与社会价值观,采用阅读疗法优化灾区人群的认知结构。 相似文献
992.
A. Kontogianni D. Damigos T. Kyrtzoglou C. Tourkolias M. Skourtos 《Environmental Hazards》2019,18(2):173-190
Coastal areas around the world are threatened by an accelerated sea level rise (SLR), storm surges and coastal flooding related to climate change. These threats, together with the land use pattern of coastal areas, could create a dangerous mix for coastal communities and could result in major socio-economic and environmental consequences. Apart from human settlements, seaports are likely to be most vulnerable to climate change because they are located at areas exposed to SLR and storm surges or at mouths of rivers susceptible to flooding. To remain efficient and resilient, seaports must anticipate the impacts of climate change and proactively prepare for SLR, increased flooding, and more frequent extreme storm events. This paper presents the analytical and empirical aspects of an integrated vulnerability index (VI) for small raft harbours based on the methodology of the IPCC for coastal vulnerability assessment. Six corresponding steps are adopted to assess the fishing ports VI (VIP-F) considering geophysical and socio-economic parameters. The proposed index is applied to 47 fishing boats and small commercial harbours of Lesvos, Greece. The proposed methodology can be adapted for assessing the vulnerability of major ports. 相似文献
993.
Seat belt laws by themselves led to increased belt use in the United States and Canada, but initial effects were limited. Canadian provincial officials launched highly publicized enforcement campaigns in the early 1980s that resulted in substantially increased belt use. Canadian-style enforcement programs subsequently were adopted in the United States, and the use of such programs has grown in recent years. Lessons from these efforts include the importance of police leadership, focused publicity about enforcement, and sustained rather than single-shot efforts. What is needed in the United States to achieve a national belt use rate of 90% or greater is widespread, methodical, and sustained application of enforcement programs augmented by creative publicity. Enhanced penalties-in particular drivers license points-likely will be needed to reach hard-core nonusers. 相似文献
994.
995.
The local branches of the Russian Forestry Service, the leskhozy, were known for their efficiency and management skills in the Soviet era and were one of the very few community-based Soviet-type institutions to survive the transition. This article examines the role of the leskhozy in the new market economy. Our analysis is based on data from interviews with informants attached to the forestry sector in the Murmansk area. In some cases their knowledge of the leskhozy stretches back to the emergence of the system in 1947. Our principal finding is that the struggle to survive as a federal body in the current legal and economic climate is forcing the leskhozy to relegate sustainable forestry management, presumably their primary raison dêtre, to the lower portions of their list of priorities. Several consequences result. There is a heightened incidence of illegal logging, and corruption informs the allocation of forest areas to private interests. Stumpage prices have plummeted as timber from subsidized commercial cutting (ostensibly sanitary cutting or thinning) has flooded the markets. The root cause of these tribulations lies with the market-based harvesting permit system. Its introduction in the 1990s did little to eliminate the self-seeking practices of the old Soviet forestry management hierarchies. In the free market, local forestry managers can turn their dual responsibilities to their own advantage inasmuch as they control the allocation of harvesting permits while at the same time controlling logging practices. 相似文献
996.
Environmental Education: Biodiversity 总被引:4,自引:0,他引:4
M. Kassas 《The Environmentalist》2002,22(4):345-351
Environmental education was a principal topic on the agenda of the Stockholm 1972 Conference. In response to its recommendation UNESCO and UNEP developed and launched the International Environmental Education Program (IEEP) in 1977. Environmental education was perceived to encompass in-school and out-of-school activities and public awareness. Later developments added training to its objectives and the concept of sustainable development to its dimensions. The international Convention on Biological Diversity (CBD) represented a phase in the world commitment to conservation of nature. It underpinned biodiversity in the fields of environmental education. Biodiversity education is based on five pivots: scale of boundaries (from local to worldwide), perspectives, goals, themes (vary according to actors), and assimilation (evaluation of programs of action). Directions relate to learners and teachers, and processes address: awareness, school education, education (and professional training) at tertiary level, roles of communication and media institutions. 相似文献
997.
998.
杨金柱 《中国环境管理干部学院学报》2005,15(2):124-126
素质教育的提出与实施,是我国教育改革发展的必然趋势,是提高全民素质,迎接21世纪挑战、参与国际竞争的迫切需要,是全面贯彻教育方针,建设中国特色社会主义教育体系的时代要求. 相似文献
999.
煤矿井下作业场所粉尘浓度的法律管理 总被引:2,自引:0,他引:2
煤矿井下作业场所粉尘浓度管理标准的变动,会给煤矿的防尘工作带来很大影响。煤矿防尘工作的好坏主要取决于综合防尘措施的落实、防尘科技的发展状况以及与此相适应的法规标准。脱离实际的防尘标准,只能导致实际工作中的虚夸与浮躁,不利于防尘工作的正常开展 相似文献
1000.
Tiao J. Chang Xenia A. Kleopa 《Journal of the American Water Resources Association》1991,27(2):275-281
ABSTRACT: Existing definitions of drought have focused on limited hydrologic indicators and are less effective for the purpose of drought monitoring. This study uses historical records of streamflow, precipitation, ground water, temperature, and lake elevation to define drought. Based on the method of truncation, drought durations and conditional probabilities of each indicator were estimated to define the drought severity levels, namely, 70 percent, 80 percent, 90 percent, and 95 percent. A drought monitoring method was developed by a combination of truncation level, duration, and conditional probabilities of five indicators. A six-month period of the 1988 drought in the central Ohio region was used to test the monitoring method. It was found that the developed method could effectively detect an occurrence of drought. 相似文献