全文获取类型
收费全文 | 3018篇 |
免费 | 42篇 |
国内免费 | 25篇 |
专业分类
安全科学 | 163篇 |
废物处理 | 154篇 |
环保管理 | 612篇 |
综合类 | 334篇 |
基础理论 | 725篇 |
环境理论 | 5篇 |
污染及防治 | 756篇 |
评价与监测 | 212篇 |
社会与环境 | 106篇 |
灾害及防治 | 18篇 |
出版年
2023年 | 25篇 |
2022年 | 37篇 |
2021年 | 26篇 |
2020年 | 21篇 |
2019年 | 31篇 |
2018年 | 66篇 |
2017年 | 67篇 |
2016年 | 89篇 |
2015年 | 58篇 |
2014年 | 84篇 |
2013年 | 280篇 |
2012年 | 143篇 |
2011年 | 177篇 |
2010年 | 120篇 |
2009年 | 122篇 |
2008年 | 154篇 |
2007年 | 187篇 |
2006年 | 152篇 |
2005年 | 105篇 |
2004年 | 104篇 |
2003年 | 116篇 |
2002年 | 89篇 |
2001年 | 67篇 |
2000年 | 46篇 |
1999年 | 51篇 |
1998年 | 38篇 |
1997年 | 43篇 |
1996年 | 43篇 |
1995年 | 40篇 |
1994年 | 41篇 |
1993年 | 34篇 |
1992年 | 37篇 |
1991年 | 26篇 |
1990年 | 29篇 |
1989年 | 19篇 |
1988年 | 13篇 |
1987年 | 20篇 |
1986年 | 25篇 |
1985年 | 17篇 |
1984年 | 18篇 |
1983年 | 28篇 |
1982年 | 28篇 |
1981年 | 25篇 |
1980年 | 19篇 |
1979年 | 16篇 |
1977年 | 11篇 |
1976年 | 9篇 |
1975年 | 9篇 |
1974年 | 10篇 |
1971年 | 11篇 |
排序方式: 共有3085条查询结果,搜索用时 15 毫秒
91.
The radon isotope 222Rn and salinity in coastal surface water were mapped on regional scales, to improve the understanding of coastal processes and their spatial variability. Radon was measured with a surface-towed, continuously recording multi-detector setup on a moving vessel. Numerous processes and locations of land-ocean interaction along the Central Great Barrier Reef coastline were identified and interpreted based on the data collected. These included riverine fluxes, terrestrially-derived fresh submarine groundwater discharge (SGD) and the tidal pumping of seawater through mangrove forests. Based on variations in the relationship of the tracers radon and salinity, some aspects of regional freshwater inputs to the coastal zone and to estuaries could be assessed. Concurrent mapping of radon and salinity allowed an efficient qualitative assessment of land-ocean interaction on various spatial and temporal scales, indicating that such surveys on coastal scales can be a useful tool to obtain an overview of SGD locations and processes. 相似文献
92.
The current trend in foreign aid is toward small-scale sustainable development projects in partnership with defined communities.
However, these projects are subject to the influences of self-interested human behavior, poorly defined community structures
and resources and organizational constraints that can prevent full realization of development models. Under these constraints,
attempting participatory community development models to the exclusion of other techniques may not be the most effective way
to achieve positive change. Instead, development agencies should consider adopting other proven elements of development in
combination with the spirit of community development to achieve a positive impact within the community and organizational
structures and ensure accountability for success. A small-scale attempted, sustainable development case study in Rwanda is
reviewed, as well as a new concept for larger scale development integrating ‘carbon credits’. Additionally, a development
accreditation organization is proposed to ensure additional accountability in this field. 相似文献
93.
A Generic Bio-Economic Farm Model for Environmental and Economic Assessment of Agricultural Systems 总被引:2,自引:0,他引:2
Janssen S Louhichi K Kanellopoulos A Zander P Flichman G Hengsdijk H Meuter E Andersen E Belhouchette H Blanco M Borkowski N Heckelei T Hecker M Li H Oude Lansink A Stokstad G Thorne P van Keulen H van Ittersum MK 《Environmental management》2010,46(6):862-877
Bio-economic farm models are tools to evaluate ex-post or to assess ex-ante the impact of policy and technology change on agriculture, economics and environment. Recently, various BEFMs have been developed, often for one purpose or location, but hardly any of these models are re-used later for other purposes or locations. The Farm System Simulator (FSSIM) provides a generic framework enabling the application of BEFMs under various situations and for different purposes (generating supply response functions and detailed regional or farm type assessments). FSSIM is set up as a component-based framework with components representing farmer objectives, risk, calibration, policies, current activities, alternative activities and different types of activities (e.g., annual and perennial cropping and livestock). The generic nature of FSSIM is evaluated using five criteria by examining its applications. FSSIM has been applied for different climate zones and soil types (criterion 1) and to a range of different farm types (criterion 2) with different specializations, intensities and sizes. In most applications FSSIM has been used to assess the effects of policy changes and in two applications to assess the impact of technological innovations (criterion 3). In the various applications, different data sources, level of detail (e.g., criterion 4) and model configurations have been used. FSSIM has been linked to an economic and several biophysical models (criterion 5). The model is available for applications to other conditions and research issues, and it is open to be further tested and to be extended with new components, indicators or linkages to other models. 相似文献
94.
Thomas WH 《Environmental management》2010,45(1):82-92
It has been proposed that indigenous societies can be models for the conservation of biodiversity. However, attempts at implementing
conservation-based development plans are being judged failures. In this article, I argue that these failures can be addressed
by translating indigenous knowledge into context that is mutually intelligible to both indigenous people and conservation
biologists. Drawing on sixteen months of ethnobiological fieldwork, this article uses indigenous knowledge to describe the
relationship of traditional life to biodiversity for the Hewa of Papua New Guinea’s Central Range. The island of New Guinea
is one of the planet’s last bastions of cultural and biological diversity. Using birds as an indicator of diversity, I argue
that more productive conservation policies will emerge when indigenous activities are viewed not as vehicles for establishing
equilibrium with the environment, but as a source of ecological disturbance. Although Hewa traditions currently play a significant
role in shaping this biologically diverse environment, their lifestyle is not necessarily a template for sustainability in
the future. 相似文献
95.
Urban futures that are more resilient and sustainable require an integrated social–ecological system approach to urban policymaking, planning, management, and governance. In this article, we introduce the Urban Biodiversity and Ecosystem Services (URBES) and the Cities and Biodiversity Outlook (CBO) Projects as new social–ecological contributions to research and practice on emerging urban resilience and ecosystem services. We provide an overview of the projects and present global urbanization trends and their effects on ecosystems and biodiversity, as a context for new knowledge generated in the URBES case-study cities, including Berlin, New York, Rotterdam, Barcelona, and Stockholm. The cities represent contrasting urbanization trends and examples of emerging science–policy linkages for improving urban landscapes for human health and well-being. In addition, we highlight 10 key messages of the global CBO assessment as a knowledge platform for urban leaders to incorporate state-of-the-art science on URBES into decision-making for sustainable and resilient urban development. 相似文献
96.
Emmanuel Kumi Albert A. Arhin Thomas Yeboah 《Environment, Development and Sustainability》2014,16(3):539-554
The Rio+20 summit of the United Nations in Brazil in 2012 committed governments to formulate a set of sustainable development goals (SDGs) that would be integrated into the Millennium Development Goals (MDGs) following its expiration in 2015. This decision has pushed sustainable development agenda into the limelight of development once again. Meanwhile, we note that the development agenda of many developing countries has been dominated by neoliberal orientation driven by market reforms, social inequality, and a move towards enhancing the economic competitiveness of the supply side of the economy. In this paper, we discuss the relationship between neoliberal economic agenda and sustainable development. We do so by examining how neoliberal policies of privatisation, trade liberalisation and reduction in governments spending stand to affect the attainment of sustainable development ideals and their implications on the post-2015 Sustainable Development Goals. The paper then suggests that relying solely on the mechanisms of the market in governing and allocating environmental resources is necessarily insufficient and problematic and therefore calls for a new approach—one which goes beyond just recognising the interdependency among social, environmental and economic goals and places issues of equity and addressing unfavourable power relations at the centre of interventions aimed at achieving the ideals of sustainable development. 相似文献
97.
Mover D. Thomas 《Journal of the Air & Waste Management Association (1995)》2013,63(12):517-520
The current literature on the role of sulfur dioxide in air pollution 相似文献
98.
H. P. Sanderson R. Thomas Morris Katz 《Journal of the Air & Waste Management Association (1995)》2013,63(6):328-330
Field experience with the lead acetate impregnated paper tape sampler has indicated that large errors may arise in this method due to fading of the color of the precipitated lead sulfide spots. This fading is due to the action of light, sulfur dioxide, ozone, on other substances capable of oxidizing lead sulfide. The moisture content or relative humidity of the air sample must be maintained at an appropriate level to ensure reaction with the impregnated paper tape. The effects of the factors have been investigated in laboratory experiments with known concentrations of H2S. A number of antioxidants were studied in relation to the stability of the resultant spots to light and oxidation Orthophenyl phenol was found to be the most effective antioxidant for this purpose. A number of necessary precautions to be employed in the use of the lead acetate method are recommended and the limitations are discussed. 相似文献
99.
Timothy M. Gilmore Thomas R. Hanna 《Journal of the Air & Waste Management Association (1995)》2013,63(10):965-967
Recent investigations have indicated that ambient air CO measurements may not reflect population exposure to CO. The lack of correlation may be due to improper siting of CO instruments, improper interpretation of air quality data, or both. Studies of population carboxy-hemoglobin levels are evaluated and compared with ambient air data., No significant correlation was found between median population COHb levels and reductions in CO concentrations required to meet ambient air standards when calculations used to estimate reductions were based on the second highest 8 hour average. However, calculated reductions based on annual average concentrations and a trend analysis technique correlated significantly with COHb levels in five cities from which both CAMP and COHb data were available. Studies to determine the nature of the relationship between ambient air CO concentrations and population COHb levels are needed. The differences between the Occupational Safety and Health Act Regulations and the National Ambient Air Standards for carbon monoxide should be scrutinized to determine if a redefinition of the standards or their applicability is warranted. A reevaluation of the controls necessary to make reductions in population COHb burden may be necessary. 相似文献
100.
Roger J. Cheng Volker A. Mohnen Thomas T. Shen Michael Current John B. Hudson 《Journal of the Air & Waste Management Association (1995)》2013,63(8):787-790
The emphasis on participate control from industrial processes has been shifted recently towards fine particulates, having diameters less than 3 microns. There exists an urgent need for more scientific information of fine particle characterization.1,2 Coal and oil fired power plants are among the largest anthropogenic point sources of particulate matter.3 Limited knowledge is available on particle size distribution and trace metal composition in power plant emissions.4-7 The morphological properties of particle emissions have been largely neglected. In this report we present some information on particle characteristics for an oil-fired and coal-fired power plant. 相似文献