全文获取类型
收费全文 | 26093篇 |
免费 | 2164篇 |
国内免费 | 4302篇 |
专业分类
安全科学 | 4447篇 |
废物处理 | 1140篇 |
环保管理 | 3892篇 |
综合类 | 14124篇 |
基础理论 | 2555篇 |
环境理论 | 16篇 |
污染及防治 | 2121篇 |
评价与监测 | 1294篇 |
社会与环境 | 1743篇 |
灾害及防治 | 1227篇 |
出版年
2024年 | 54篇 |
2023年 | 286篇 |
2022年 | 556篇 |
2021年 | 781篇 |
2020年 | 751篇 |
2019年 | 679篇 |
2018年 | 619篇 |
2017年 | 836篇 |
2016年 | 999篇 |
2015年 | 1109篇 |
2014年 | 1289篇 |
2013年 | 1576篇 |
2012年 | 1971篇 |
2011年 | 2065篇 |
2010年 | 1541篇 |
2009年 | 1513篇 |
2008年 | 1203篇 |
2007年 | 1852篇 |
2006年 | 1888篇 |
2005年 | 1451篇 |
2004年 | 1227篇 |
2003年 | 1338篇 |
2002年 | 1078篇 |
2001年 | 915篇 |
2000年 | 870篇 |
1999年 | 804篇 |
1998年 | 602篇 |
1997年 | 498篇 |
1996年 | 428篇 |
1995年 | 367篇 |
1994年 | 313篇 |
1993年 | 271篇 |
1992年 | 215篇 |
1991年 | 152篇 |
1990年 | 108篇 |
1989年 | 56篇 |
1988年 | 48篇 |
1987年 | 28篇 |
1986年 | 27篇 |
1985年 | 34篇 |
1984年 | 18篇 |
1983年 | 19篇 |
1982年 | 16篇 |
1981年 | 14篇 |
1980年 | 12篇 |
1979年 | 15篇 |
1978年 | 9篇 |
1977年 | 16篇 |
1974年 | 10篇 |
1973年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 283 毫秒
41.
Bhopal Gas Tragedy was the worst industrial accident in the world where several thousand persons lost their lives. It occurred at the Union Carbide plant located inside the city of Bhopal and close to the railway station, at midnight of December 2-3, 1984 due to the leakage of MIC gas which took the local sleeping and floating population unawares.
This paper describes the experience of a transit passenger who reached the Bhopal Railway Station by train at about the same time when the deadly gas leakage occurred. 相似文献
42.
Mfon T.Udo 《环境科学学报(英文版)》2002,14(4)
Aspects of the trophic attributes of the mudskipper,Periophthalmus barbarus occurring in the mangrove swamps of ImoRiver estuary, Nigeria, were investigated during a 12-month period(April, 1992-March, 1993). Feeding intensity increased with size;it was higher in the dry season (November-April) than in the wetseason (May-October); monthly changes in the indices of feedingintensity were significantly correlated. Major food objectscomprised detritus and benthic algae; crustaceans, insects,macrophyte matter and sand grains were minor food objects whilefish, molluscs, Chilopoda, nematodes and fungi were unconsciouslydevoured objects. Diet varied seasonally; algae and sesarmid crabswere generally more in the dry season than during the rains whereasFPOM and fish increased in the wet over dry season. The mudskipperdisplay a high degree of euryphagy and can be considered as ageneralist and an omnivore. The lower trophic status of P. barbarusqualifies it as a good aquaculture candidate. Food richness washigher in big-sized class (BSC) than small-sized class (SSC).Size-based and seasonal variations were not apparent in foodrichness. Diet breadth was higher in the BSC than the SSC; therewas dry season increase in diet breadth. 相似文献
43.
张似松 《长江流域资源与环境》1993,2(2):155-159
分析江汉平原粮食生产的优势与问题,运用商品经济的观念,提出改革开放新形势下加快江汉平原粮食开发的设想,即依托市场,按照价值规律,科学地调整种植业比例和粮食种类结构,发展优质品种,扩大优化模式及采用高新技术等,通过优质、高产、高效,促进江汉平原粮食生产的发展。 相似文献
44.
Russian Journal of Ecology - 相似文献
45.
46.
有意违章行为动因分析与控制对策探讨 总被引:11,自引:3,他引:8
毛海峰 《中国安全科学学报》2003,13(2):18-21
对有意违章行为的含义进行了界定 ,并对有意违章行为产生的动因进行了详细分析 ,提出了有意违章行为的动因主要包含违章行为与遵章行为满足生理心理需要作用的差值ΔXW、违章行为会受到法规惩处的作用FW、违章行为可导致人身伤害的主观感觉的作用RW3个方面。同时对 3个方面的动因按弗鲁姆的激励理论进行了转化 ,给出了各自的含义说明。笔者按动因分析的结果 ,给出了控制有意违章行为的步骤和措施 相似文献
47.
Evolution of environmental impact assessment as applied to watershed modification projects in Canada
Herman J. Dirschl Nicholas S. Novakowski M. Husain Sadar 《Environmental management》1993,17(4):545-555
This article reviews the application of environmental impact assessment (EIA) procedures and practices to three watershed
modification projects situaled in western Canada. These ventures were justified for accelerating regional economic development,
and cover the period during which public concerns for protecting the environment rapidly made their way into the national
political agenda. An historical account and analysis of the situation, therefore, seems desirable in order to understand the
development of EIA processes, practices, and methodologies since the start of construction of the first project in 1961. This
study concludes that there has been good progress in predicting and evaluating environmental and related social impacts of
watershed modification proposals. However, a number of obstacles need to be overcome before EIA can firmly establish itself
as an effective planning tool. These difficulties include jurisdictional confusions and conflicts, division of authority and
responsibility in designing and implementing appropriate mitigative and monitoring measures, lack of tested EIA methodologies,
and limited availability of qualified human resources. A number of conclusions and suggestions are offered so that future
watershed modification proposals may be planned and implemented in a more environmentally sustainable fashion. These include:
(1) EIA processes must be completed before irrevocable decisions are made. (2) Any major intrusion into a watershed is likely
to impact on some major components of the ecosystem(s). (3) Mitigation costs must form part of the benefit-cost analysis of
any project proposal. (4) Interjurisdictional cooperation is imperative where watersheds cross political boundaries. (5) The
EIA process is a public process, hence public concerns must be dealt with fairly. (6) The role of science in the EIA process
must be at arms length from project proponents and regulators, and allowed to function in the interest of the protection of
the environment and public health and safety.
The views expressed here are the authors’ own and do not necessarily reflect those of FEARO and/or other government agencies
and officials involved in the review of these projects. 相似文献
48.
由于我国对企业特别是海外来大陆投资的企业,缺乏严格的安全管理手段,致使不少企业屡次出现安全事故。为了减少企业安全事故的发生,提高企业安全度,要求企业在贯彻“安全第一,预防为主”的基本方针的基础上。建立“以人为本。以制度和伦理道德为约束的人性化的安全管理系统”。本文给出了该系统的模型,并对此模型进行了分析和解释,探讨了相关的几个理论基础,最后给出了人性化安全管理的实质。通过该系统的管理执行,使企业在尊重人权、尊重生命的前提下发展壮大,最终实现安全的全球化。 相似文献
49.
长江河口近岸水体自然净化作用及其初步评价 总被引:9,自引:1,他引:8
按照水体的净化机理,结合长江口和上海滨岸带近岸水体的物理、化学和生物等因素的实际特征,对近岸水体的自然净化作用进行了阐述和分析。并在历史资料和实测资料基础上,就近岸水体的自然净化作用进行了评价。评价结果表明,因长江河口近岸水体存在较强的自然净化作用机制,近岸水体体的自然净化能力较强,环境容量较大,但由于污染物输入量的不断增加,部分岸段近岸水体的环境质量有逐渐下降的趋势;近岸水体的自然净化作用具有明显的季节性变化,长江口南岸水域洪水季节水体的自然净化作用比估水季节强,而杭州湾北岸水域的自然净化作用表现为相反的变化趋势,因此建议在近岸污水排放过程中应考虑近岸水体的净化能力,遵循水体的自然净化作用规律。 相似文献
50.