首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   193篇
  免费   10篇
  国内免费   1篇
安全科学   49篇
环保管理   78篇
综合类   33篇
基础理论   15篇
污染及防治   11篇
评价与监测   6篇
社会与环境   11篇
灾害及防治   1篇
  2024年   7篇
  2023年   6篇
  2022年   3篇
  2021年   3篇
  2020年   8篇
  2019年   5篇
  2018年   4篇
  2017年   7篇
  2016年   10篇
  2015年   7篇
  2014年   9篇
  2013年   12篇
  2012年   15篇
  2011年   11篇
  2010年   7篇
  2009年   13篇
  2008年   4篇
  2007年   11篇
  2006年   6篇
  2005年   3篇
  2004年   6篇
  2003年   4篇
  2002年   5篇
  2001年   4篇
  2000年   2篇
  1999年   6篇
  1998年   6篇
  1996年   1篇
  1995年   3篇
  1994年   1篇
  1993年   1篇
  1992年   5篇
  1991年   1篇
  1990年   1篇
  1988年   2篇
  1986年   1篇
  1984年   1篇
  1980年   1篇
  1976年   1篇
  1975年   1篇
排序方式: 共有204条查询结果,搜索用时 15 毫秒
81.
  总被引:6,自引:0,他引:6  
Soil contaminated with heavy metals cadmium(Cd)and lead(Pb)is hard to be remediated.Phytoremediation may be a feasible method to remove toxic metals from soil,but there are few suitable plants which can hyperaccumulate metals.In this study,Cd and Pb accumulation by four plants including sunflower(Helianthus annuus L.),mustard(Brassica juncea L.),alfalfa(Medicago sativa L.), ricinus(Ricinus communis L.)in hydroponic cultures was compared.Results showed that these plants could phytocxtract heavy metals, the ability of accumulation differed with species,concentrations and categories of heavy metals.Values of BCF(bioconcentration factor)and TF(translocation factor)indicated that four species had dissimilar abilities of phytoextraction and transportation of heavy metals.Changes on the biomass of plants,pH and Eh at different treatments revealed that these four plants had distinct responses to Cd and Pb in cultures.Measurements should be taken to improve the phytoremediation of sites contaminated with heavy metals,such as pH and Eh regulations,and so forth.  相似文献   
82.
为监督中国环境政策的执行、环境保护管理体系的运行情况、环保资金的投入与效益以及资源的合理开发利用、大气污染、水污染、有害废物控制与治理情况及自然资源保护状况等,需要审计机关通过环境审计进行监督,因此开展环境审计势在必行.文章从论证开展环境审计的必要性入手,就完善环境审计的法律法规提出了意见.  相似文献   
83.
    
The income and pollution relationship is widely debated in the literature, but income alone cannot control emissions, and that requires environmental regulation measures. Even though weak environmental regulations may offset market failures caused by negative externality of pollution, investigation of their role in the control of environmental pollution is of prime importance. To better understand the role of environmental regulations in carbon emissions mitigation, this study takes a step to offers a new perspective on the role of environmental regulations in pollution reduction for Brazil, Russia, India, China, and South Africa. To this end, the study employs panel data econometric tools for data spanning from 1995 to 2016. Besides, the study conducts fully modified ordinary least squares estimator to get country‐wise results. Empirical results confirm the positive role of environmental regulations in carbon emission mitigation, and the current environmental control measures are successful in achieving pollution reduction targets in the sample countries. Environmental regulations help in establishing the inverted U‐shaped relationship between income and pollution. Climate change mitigation in BRICS (Brazil, Russia, India, China, and South Africa) countries is not associated with economic development only but driven by effective environmental regulations as well.  相似文献   
84.
    
This study reviews the potential use of biochar as soil amendment in afforestation, reforestation, agroforestry, fruit tree orchards, and bio-energy plantations. Implementing this practice could sequester large amounts of carbon (C) over the long-term, potentially offsetting anthropogenic emissions of carbon dioxide, and mitigating climate change. On a global scale, this practice could sequester between 2 and 109.2 Pg biochar-C in 1.75 billion ha of degraded and deforested lands and agroforestry systems. An additional considerable amount could be sequestered in the soil of fruit tree orchards and bio-energy plantations. The anticipated improvement in the quality of the biochar-amended soils is expected to enhance resilience to these land uses, increasing their adaptation capacity to climate change. Yet, specific questions still need to be addressed, for example, the impact of biochar on the availability of nitrogen and potassium for plants in acidic soils and under humid conditions, as well as the impact of biochar on soil and trees in alkaline soils and under Mediterranean or drier conditions. Also, a full assessment of health hazards and environmental risks related to the production of biochar and its application in soil is required. Other questions relate to the environmental and economic costs of biochar application. Therefore, life cycle assessments and economic calculations should be conducted on a site-specific basis and include the practices of feedstock collection, transportation, processing, and spreading. International actions should regulate biochar practice as an eligible means for funding under the C finance mechanism. Specifically, payments should be provided to landowners for accomplishing ecosystem services.  相似文献   
85.
Sustainability-related issues present significant financial, strategic, compliance and operational risks to manufacturers. Many of these risks directly or indirectly result from the way a product is designed and managed across its life cycle. Assessing sustainability risk (S R) at the product design stage is crucial for the development of products that both minimise sustainability risk exposure and are environmentally sustainable. Managing the costs associated with these risks requires risk management intervention at the design stage before these costs are committed throughout the life cycle (production, use, end-of-life). The goal of the sustainability risk assessment (SRA) methodology is to provide an approach to comparing the financial cost of a ‘sustainable product’ vs. an ‘unsustainable product’, by factoring in the effects of S R on life-cycle cost. The SRA methodology demonstrates that, in some cases, sustainable products cost less than unsustainable products when sustainability risk is considered in the costing analysis. This paper outlines the first step of the SRA methodology, which is a process for identifying S R inherent in the product life cycle. Once key risks are identified, the subsequent steps of the SRA assess and prioritise these risks for treatment through changes to product design and materials composition.  相似文献   
86.
87.
A lot of scientific knowledge is required to carry out and enforce environmental regulations. The paper deals with the relationship between law and science from a legal perspective. First, some difficulties in using science to carry out environmental regulations are outlined. After this, some legal concepts which try to cope with the problems are presented. Aspects discussed are the precautionary principle, the legal concept of 'state of the art', general standard setting, the flexibility of the regulations, and procedural regulations for the standard-setting process. Finally, the new challenge for science that derives from the legal demand of an integrated approach to environmental protection is addressed.  相似文献   
88.
Environmental problems are a function of the process of economic development and the ability to mitigate the problems through regulation. An historical analysis helps to show how the problems have been solved thus far. The objective of this investigation is to present an overview of environmental problems and the corresponding regulations in Western Europe during the 1980s. Environmental problems for 18 Western European countries were identified from abstracts from a data base on environmental literature. The 1977 findings were systematized on the basis of 20 key words according to source and impact, and a new data base was established. The data showed that the main environmental problems in Western Europe were: energy production/acid rain, nuclear power/waste, air pollution/climate, heavy metals, pesticides, water pollution, solid waste, and unforeseen accidents. Many environmental problems are common to most European countries. Regulatory measures differ significantly. In some countries environmental regulations are largely limited to the implementation of European Economic Community (EEC) directives. We have supplemented the national analyses with an examination of existing and proposed EEC regulations along with interviews with civil servants in the EEC Commission. In the 1980s, EEC environmental regulations were similar to environmental regulations in some member states. It is expected that future EEC regulations will be less reflective of those of individual member states.  相似文献   
89.
安全培训是企业安全生产的一项重要的基础性工作,为提高员工安全生产技能、强化安全防范意识、切实提高安全培训效果,围绕企业中的安全培训问题,以对安全培训现状的概述为基础,通过对新员工,接触新设备、新工艺、新技术的员工,从事特种作业的员工等3类特殊群体的安全培训问题深入分析,最后提出意见对策.  相似文献   
90.
ABSTRACT: The purpose of this paper is to describe a land use and environmental planning model. Map overlays were used for analyzing and aggregating economic, social, and environmental data. Various land use categories were evaluated using a numerical scoring system. These scores were then used to assist in the development of land use regulations in a coastal county in South Carolina.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号