全文获取类型
收费全文 | 1025篇 |
免费 | 37篇 |
国内免费 | 80篇 |
专业分类
安全科学 | 70篇 |
废物处理 | 13篇 |
环保管理 | 312篇 |
综合类 | 416篇 |
基础理论 | 99篇 |
环境理论 | 1篇 |
污染及防治 | 139篇 |
评价与监测 | 50篇 |
社会与环境 | 34篇 |
灾害及防治 | 8篇 |
出版年
2024年 | 2篇 |
2023年 | 6篇 |
2022年 | 17篇 |
2021年 | 22篇 |
2020年 | 28篇 |
2019年 | 14篇 |
2018年 | 17篇 |
2017年 | 23篇 |
2016年 | 28篇 |
2015年 | 30篇 |
2014年 | 36篇 |
2013年 | 41篇 |
2012年 | 55篇 |
2011年 | 84篇 |
2010年 | 51篇 |
2009年 | 65篇 |
2008年 | 62篇 |
2007年 | 71篇 |
2006年 | 60篇 |
2005年 | 43篇 |
2004年 | 49篇 |
2003年 | 48篇 |
2002年 | 39篇 |
2001年 | 34篇 |
2000年 | 38篇 |
1999年 | 29篇 |
1998年 | 38篇 |
1997年 | 25篇 |
1996年 | 23篇 |
1995年 | 17篇 |
1994年 | 6篇 |
1993年 | 2篇 |
1992年 | 6篇 |
1991年 | 7篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1973年 | 2篇 |
1971年 | 1篇 |
排序方式: 共有1142条查询结果,搜索用时 48 毫秒
941.
A. Mauffret A. Rico-Rico J. Blasco 《Environmental pollution (Barking, Essex : 1987)》2010,158(2):529-535
Linear Alkylbenzene Sulfonates (LAS) effects (mortality, egestion rate, behaviour) on the marine deposit feeder Hydrobia ulvae were assessed in whole-sediment and water-only systems. The results were combined with a bioenergetic-based kinetic model of exposure pathways to account for the observed toxicity. The 10-d LC50 value based on the freely dissolved fraction was 9.3 times lower in spiked sediment (0.152 ± 0.001 (95% CI) mg/L) than in water-only (1.390 ± 0.020 (95% CI) mg/L). Consequently, the actual 10-d LC50 value (208 mg/kg) was overestimated by the Equilibrium Partitioning calculation (1629 mg/kg). This suggests that the sediment associated LAS fraction was bioavailable to the snails. It could also be due to modifications in physiological parameters in absence of sediment, the organism natural substrate. 相似文献
942.
Shinichi Ogiyama Hiroshi Takeda Nobuyoshi Ishii Shigeo Uchida 《Journal of environmental radioactivity》2010,101(2):177-184
Migration of 14C derived from 14C-acetic acid was examined by using soils sampled from paddies in four administrative areas in Japan (Aomori, Yamanashi, Ehime and Okinawa) and rice plant in a tracer experiment to understand the fate of 14C in the paddy soil-to-rice plant system. The loss of 14C radioactivity levels derived from 14C-acetic acid was caused by soil microorganism breakdown. A part of the 14C fixation to soil was caused by microbial assimilation into the fatty acid fraction. 14C moved upward via two different types of 14C dynamics in soil: quick movement upward; and constant but slow movement upward. 14C was highly assimilated into the plant panicle and that was caused by the root-uptake and the transfer of 14C. Migration of 14C derived from 14C-acetic acid relied heavily upon changes of chemical forms and characteristics of 14C-compound as caused by microorganisms in soil. 相似文献
943.
944.
The application of an indicator based on taxonomic distinctness for UK marine biodiversity assessments 总被引:3,自引:0,他引:3
Leonard DR Robert Clarke K Somerfield PJ Warwick RM 《Journal of environmental management》2006,78(1):52-62
Mankind needs to use the resources and opportunities offered by the marine environment while protecting ecological processes and systems. This is the foundation for sustainable development, which can only be achieved by adopting an appropriate management approach. Whether internationally or at a regional scale, successful management of marine ecosystems needs to be based on a scientifically robust approach to monitoring environmental change. Within such a framework, the conservation of marine biological diversity is problematic, as many conventional measures of diversity are not appropriate for measuring the types of change that require management. New indicators are required and in this paper we summarise some of the current methodology being used to derive such indices, which may be used to evaluate the effectiveness of marine stewardship initiatives. Through a series of examples we demonstrate the application of the taxonomic distinctness indicator of biodiversity to marine environmental assessment and its development towards becoming an operational tool. 相似文献
945.
我国的固体废物处理处置现状与发展 总被引:66,自引:2,他引:64
本文在对固体废物的污染状况、管理中存在的问题,现有技术水平以及社会需求进行分析的基础上,提出了建立了区域性集中处理处置技术体系的观点及应考虑优先发展的处理处置技术。 相似文献
946.
我国公路交通防抗极端天气灾害的应急探讨 总被引:1,自引:1,他引:0
极端天气事件将变得更加频繁和剧烈,为了提高我国公路交通防抗极端天气灾害的应急能力,采用分析对比和调查研究的方法,探讨我国公路交通在防抗2008年南方大雪灾中的应急管理工作与处置技术,研究国内外目前应对极端天气的成功经验。结果表明:我国公路交通防抗极端天气灾害主要在组织机构、责任机制、信息渠道和处置技术等方面存在问题。通过提出我国公路交通防抗极端天气应急处置的具体流程,可以迅速控制、减轻和消除公路交通极端天气引起的危害,及时恢复公路交通正常通行。 相似文献
947.
为准确测算尾矿膏体排放的堆积坡度,在已有研究的基础上,分析了膏体坡面明渠流动的自适应变化过程,提出膏体恒定均匀流动时的平衡坡降等同堆积坡度。研究平衡坡降状态下,明渠流动断面、临界流速以及阻力系数的确定方法,建立堆积坡度测算的基本流程和方法。以某铜矿为背景,测算不同质量分数及排放流量条件下膏体的堆积坡度,结果表明:流量一定,质量分数越高堆积坡度越大;质量分数一定,排放流量越大堆积坡度越小;推荐该矿排放质量分数70%,排量150 m3/h,此时堆积坡度为5.34%,尾矿库占地面积较原湿式排放降低27%。 相似文献
948.
949.
New perspectives on sea use management: initial findings from European experience with marine spatial planning 总被引:3,自引:0,他引:3
Increased development pressures on the marine environment and the potential for multiple use conflicts, arising as a result of the current expansion of offshore wind energy, fishing and aquaculture, dredging, mineral extraction, shipping, and the need to meet international and national commitments to biodiversity conservation, have led to increased interest in sea use planning with particular emphasis on marine spatial planning. Several European countries, on their own initiative or driven by the European Union's Marine Strategy and Maritime Policy, the Bergen Declaration of the North Sea Conference, and the EU Recommendation on Integrated Coastal Zone Management, have taken global leadership in implementing marine spatial planning. Belgium, The Netherlands, and Germany in the North Sea, and the United Kingdom in the Irish Sea, have already completed preliminary sea use plans and zoning proposals for marine areas within their national jurisdictions. This paper discusses the nature and context of marine spatial planning, the international legal and policy framework, and the increasing need for marine spatial planning in Europe. In addition, the authors review briefly three marine spatial planning initiatives in the North Sea and conclude with some initial lessons learned from these experiences. 相似文献
950.
Artisanal fishing is an activity which has long occupied an important place on the West African coast. In less than 20 years,
the increasingly widespread use of motors in fishing boats and cold storage facilities both on board and on land have enabled
fishermen to master the constraints of space and time. Furthermore, globalization has created a demand for new products, thus
influencing the behaviour of fishermen and consequently the status of some fish, turtle and marine mammal species. Development
policies for artisanal fishing do not adequately reflect the importance of these changes. They tend to use inappropriate scales
of reference, be it spatially (national borders take precedence over ecosystems) or temporally (the long-term consequences
of development plans are seldom considered). Some international conservation organizations are testing promising new approaches
to managing resources more sustainably and restoring degraded ecosystems, and their recent experiences can serve as useful
examples to others. It is recommended to grant special rights of access to resident fishermen. In defending ‘their’ resources,
they will also protect the ecological functions of the area. Close collaboration with administrations and development assistance
agencies is needed to assess consequences of political decisions on the use of resources. The important role of marine protected
areas as a tool for fishing management should be better documented and strengthened. These areas should not be considered
as isolated units but rather as vital parts of a comprehensive system for improved coastal zone management. Consistent with
the ecosystem approach, fishermen and their communities, being the main users of coastal resources, should also play a major
role in the design and implementation of any fishing management actions. 相似文献