全文获取类型
收费全文 | 807篇 |
免费 | 26篇 |
国内免费 | 43篇 |
专业分类
安全科学 | 73篇 |
废物处理 | 11篇 |
环保管理 | 229篇 |
综合类 | 267篇 |
基础理论 | 106篇 |
污染及防治 | 31篇 |
评价与监测 | 82篇 |
社会与环境 | 60篇 |
灾害及防治 | 17篇 |
出版年
2023年 | 4篇 |
2022年 | 9篇 |
2021年 | 14篇 |
2020年 | 25篇 |
2019年 | 16篇 |
2018年 | 11篇 |
2017年 | 16篇 |
2016年 | 27篇 |
2015年 | 25篇 |
2014年 | 32篇 |
2013年 | 81篇 |
2012年 | 31篇 |
2011年 | 56篇 |
2010年 | 36篇 |
2009年 | 57篇 |
2008年 | 48篇 |
2007年 | 64篇 |
2006年 | 35篇 |
2005年 | 35篇 |
2004年 | 31篇 |
2003年 | 39篇 |
2002年 | 27篇 |
2001年 | 27篇 |
2000年 | 29篇 |
1999年 | 19篇 |
1998年 | 9篇 |
1997年 | 14篇 |
1996年 | 1篇 |
1995年 | 9篇 |
1994年 | 5篇 |
1993年 | 5篇 |
1992年 | 6篇 |
1991年 | 5篇 |
1990年 | 6篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 2篇 |
1986年 | 4篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1977年 | 2篇 |
1972年 | 1篇 |
排序方式: 共有876条查询结果,搜索用时 31 毫秒
101.
Paolo Ciavola Oscar Ferreira Piet Haerens Mark Van Koningsveld Clara ArmaroliAuthor vitae 《Environmental Science & Policy》2011,14(7):924-933
This paper describes the MICORE approach to quantify for nine field sites the crucial storm related physical hazards (hydrodynamic as well as morphodynamic) in support of early warning efforts and emergency response.As a first step historical storms that had a significant morphological impact on a representative number of sensitive European coastal stretches were reviewed and analysed in order to understand storm related morphological changes and how often they occur around Europe. Next, an on-line storm prediction system was set up to enable prediction of storm related hydro- and morphodynamic impacts. The system makes use of existing off-the-shelf models as well as a new open-source morphological model. To validate the models at least one year of fieldwork was done at nine pilot sites. The data was safeguarded and stored for future use in an open database that conforms to the OpenEarth protocols.To translate quantitative model results to useful information for Civil Protection agencies the Frame of Reference approach (
[Van Koningsveld et al., 2005]
and
[Van Koningsveld et al., 2007]
) was used to derive Storm Impact Indicators (SIIs) for relevant decision makers. The acquired knowledge is expected to be directly transferred to the civil society trough partnerships with end-users at the end of the MICORE project. 相似文献
102.
剖析通用电气Plan(政策/目标)-Do(运营体系)-Check&Act(检查改进)的EHS管理体系框架;通过综合指数法分析各环境、健康和安全绩效指标近年的变化趋势以及采取的管理措施;分析总结GE环境管理和环境质量绩效持续改进的机制与工具:(1)全球统一的EHS管理和运营体系;(2)自上而下的EHS培训与自下而上的沟通;(3)数字化的EHS管理工具;(4)严格的EHS审计保证机制;(5)强烈的企业公民责任意识和EHS文化,为国内企业建立和完善EHS管理和运营体系所借鉴。 相似文献
103.
土壤中微生物及其环境效益的浅析 总被引:1,自引:0,他引:1
关于土壤微生物活性,已经成为目前土壤方面研究的热点问题。有些学者曾经对微生物在土壤环境中的作用表示怀疑,他们过分强调物理化学作用在土壤形成和土壤环境效应中的作用,而忽视微生物的研究。随着土壤学研究的深入,关于土壤成因、土壤生产力和环境现象已经越来越复杂,单纯依靠物理和化学的知识已经无法解释某些复杂的实验现象,现在必须依靠微生物来解释某些现象。本文将对土壤微生物在土壤研究中的作用进行简述,同时分析土壤环境变化对微生物数量和活性的影响,并简述一些微生物研究的进展。 相似文献
104.
105.
106.
107.
Peter J. Peterson W. Peter Williams 《Environmental science and pollution research international》1999,6(4):225-232
Measurements of urban air quality at monitoring stations in developed countries have frequently involved the criteria gaseous
pollutants, particulates, hazardous air pollutants, perceived air quality and relevant meteorological conditions. Large numbers
of indicators have therefore been established to quantify emissions, concentrations and environmental and human health impacts
of each of these groups of substances. To simplify the data for management, several indicators have been grouped together
to form urban air quality indices but the weightings of individual variables is contentious.
In industrialising and developing countries, data may be limited and traditional air pollutant indicators cannot often be
constructed. The emphasis therefore has to be placed on the development of policy-relevant indicators, such as Response Indicators
that reflect different policy principles for regulating air pollutant emissions. Indices that quantify the air quality management
capabilities and capacities at the city level provide further useful decision-relevant tools. Four sets of indices, namely,
1. air quality measurement capacity, 2. data assessment and availability, 3. emissions estimates, and 4. management enabling
capabilities, and a composite index to evaluate air quality management capability, were constructed and applied to 80 cities.
The indices revealed that management capability varied widely between the cities. In some of the cities, existing national
knowledge on urban air quality could have been more effectively used for management.
It was concluded that for effective urban air quality management, a greater emphasis should be given, not just to monitoring
and data capture programmes, but to the development of indicators and indices that empower decision-makers to initiate management
response strategies. Over-reliance on restricted, predetermined sets of traditional air quality indicators should be avoided. 相似文献
108.
109.
110.
Axel Hochkirch Michael J. Samways Justin Gerlach Monika Böhm Paul Williams Pedro Cardoso Neil Cumberlidge P. J. Stephenson Mary B. Seddon Viola Clausnitzer Paulo A. V. Borges Gregory M. Mueller Paul Pearce-Kelly Domitilla C. Raimondo Anja Danielczak Klaas-Douwe B. Dijkstra 《Conservation biology》2021,35(2):502-509
Measuring progress toward international biodiversity targets requires robust information on the conservation status of species, which the International Union for Conservation of Nature (IUCN) Red List of Threatened Species provides. However, data and capacity are lacking for most hyperdiverse groups, such as invertebrates, plants, and fungi, particularly in megadiverse or high-endemism regions. Conservation policies and biodiversity strategies aimed at halting biodiversity loss by 2020 need to be adapted to tackle these information shortfalls after 2020. We devised an 8-point strategy to close existing data gaps by reviving explorative field research on the distribution, abundance, and ecology of species; linking taxonomic research more closely with conservation; improving global biodiversity databases by making the submission of spatially explicit data mandatory for scientific publications; developing a global spatial database on threats to biodiversity to facilitate IUCN Red List assessments; automating preassessments by integrating distribution data and spatial threat data; building capacity in taxonomy, ecology, and biodiversity monitoring in countries with high species richness or endemism; creating species monitoring programs for lesser-known taxa; and developing sufficient funding mechanisms to reduce reliance on voluntary efforts. Implementing these strategies in the post-2020 biodiversity framework will help to overcome the lack of capacity and data regarding the conservation status of biodiversity. This will require a collaborative effort among scientists, policy makers, and conservation practitioners. 相似文献