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   1906篇
  免费   167篇
  国内免费   51篇
安全科学   37篇
废物处理   26篇
环保管理   903篇
综合类   445篇
基础理论   285篇
环境理论   44篇
污染及防治   49篇
评价与监测   33篇
社会与环境   232篇
灾害及防治   70篇
  2024年   4篇
  2023年   36篇
  2022年   21篇
  2021年   52篇
  2020年   56篇
  2019年   92篇
  2018年   79篇
  2017年   150篇
  2016年   112篇
  2015年   85篇
  2014年   66篇
  2013年   123篇
  2012年   85篇
  2011年   107篇
  2010年   58篇
  2009年   100篇
  2008年   84篇
  2007年   68篇
  2006年   77篇
  2005年   74篇
  2004年   54篇
  2003年   45篇
  2002年   62篇
  2001年   53篇
  2000年   56篇
  1999年   45篇
  1998年   30篇
  1997年   25篇
  1996年   25篇
  1995年   31篇
  1994年   17篇
  1993年   17篇
  1992年   12篇
  1991年   8篇
  1990年   14篇
  1989年   9篇
  1988年   7篇
  1987年   7篇
  1986年   9篇
  1985年   17篇
  1984年   8篇
  1983年   9篇
  1982年   6篇
  1981年   5篇
  1979年   4篇
  1978年   4篇
  1977年   5篇
  1973年   2篇
  1972年   2篇
  1971年   3篇
排序方式: 共有2124条查询结果,搜索用时 15 毫秒
131.
Increasingly commonplace in cities, extreme heat events introduce multi-stress vulnerability, affecting people’s health and well-being, financial situation, mobility, social relations, and access to basic services. Planning to reduce heat vulnerability has become part of government business and to some extent community-level responses, cutting across a number of sectors including public health, emergency management, social services, critical infrastructure, and housing. This planning is often framed around heat as an emergency, focusing on preventing loss of life and severe health impacts, yet a vulnerability perspective also draws attention to the chronic and persistent impacts of heat. Our research, based on interviews and desktop research in Melbourne, Australia, found tensions between addressing heat as an emergency and heat as a source of chronic stress, with emergency responses taking precedence over responses addressing the chronic dimensions of heat. Each approach results in different but nonetheless related programmatic priorities for reducing vulnerability. In complex institutional settings, improving relations between policy and programme managers, non-government organisations, and vulnerable people themselves would enable the multiple stresses associated with extreme heat to be more effectively addressed. Policy and institutional responses that better appreciate the interconnections between the emergency and chronic aspects of heat would likely reduce vulnerability and contribute to more just approaches to urban sustainability.  相似文献   
132.
The Fallacies of Concurrent Climate Policy Efforts   总被引:1,自引:0,他引:1  
Marian Radetzki 《Ambio》2010,39(3):211-222
Climate policy has assumed an extreme degree of urgency in the international debate in recent years. This article begins by taking a critical look at the scientific underpinnings of the efforts to stabilize the climate. It points to several serious question marks on the purported relationship between greenhouse gas emissions and global warming, and expresses distrust about claims of impending catastrophes related to rising sea levels, hurricanes, and spread of infectious disease. It then reviews the concurrent climate policy efforts and concludes that they are incoherent, misguided and unduly costly, and that they have so far had no perceptible impact on anthropogenic greenhouse gas emissions. The exceedingly ambitious policy plans currently under preparation suffer from similar fallacies. For these reasons, but also because of the remaining scientific doubts and the exorbitant costs that have to be incurred, skepticism is expressed about the preparedness to implement the climate policy plans currently on the table.  相似文献   
133.
During the 1990s a consensus emerged within the international humanitarian system that there was a need to enhance the 'coherence' between humanitarian and political responses to complex political emergencies. Closer integration between aid and political responses was seen to be necessary in order to address the root causes of conflict-induced crises, and to ensure that aid did not exacerbate political tensions. This paper explores the theory and practice of coherence over the past decade. It argues that, by sleight of hand, the coherence agenda has been reinterpreted such that humanitarian action has become the primary form of political action, rather than merely a substitute for it. The coherence agenda has been driven by geopolitical events, domestic policy considerations in donor countries and the more parochial concerns of aid policy, and is reflected in a number of substantive changes in the humanitarian architecture. Many of the tenets of this 'new humanitarianism' have been embraced by the majority of relief agencies, and thus legitimised it. The paper concludes that political humanitarianism, as opposed to active engagement by political and military actors, is flawed ethically and technically. It will provide neither an effective palliative for the ill effects of war, nor address its causes.  相似文献   
134.
土地政策参与宏观调控是在特定经济背景下提出的.随着时间的推移和经济环境的变化,土地政策在h参与宏观调控的过程中也应做出相应的调整.列举了新经济背景下土地调控手段存在主次错位、刚性不强、缺乏有效配合等一系列问题,针对这些问题提出了在土地政策参与宏观调控的过程中要增加地土经济手段的运用、推动土地政策法律化和增强部门间协调配合等相关对策与建议.  相似文献   
135.
Drawing on Ajzen's Theory of Planned Behaviour, this paper analyses whether there is a relation between management's behavioural intentions toward an environmental problem and the company's specific actions in this area, and also considers the impact of the company size on these actions. For the data, a questionnaire was sent to 184 managers employed in industrial companies located in Spain which belonged to the automobile industry. The empirical analysis produces positive and significant regression coefficients and provides support for the hypotheses proposed. Specifically, the results show that the environmental actions carried out in the company respond at least in part to management's behavioural intentions toward these issues and the size of the firm.  相似文献   
136.
Vegetable production in China is associated with high inputs of nitrogen, posing a risk of losses to the environment. Organic matter mineralisation is a considerable source of nitrogen (N) which is hard to quantify. In a two-year greenhouse cucumber experiment with different N treatments in North China, non-observed pathways of the N cycle were estimated using the EU-Rotate_N simulation model. EU-Rotate_N was calibrated against crop dry matter and soil moisture data to predict crop N uptake, soil mineral N contents, N mineralisation and N loss. Crop N uptake (Modelling Efficiencies (ME) between 0.80 and 0.92) and soil mineral N contents in different soil layers (ME between 0.24 and 0.74) were satisfactorily simulated by the model for all N treatments except for the traditional N management. The model predicted high N mineralisation rates and N leaching losses, suggesting that previously published estimates of N leaching for these production systems strongly underestimated the mineralisation of N from organic matter.  相似文献   
137.
Abstract

Differences between the scientific and environmental policy communities regarding marine environmental protection strategies are discussed in the context of the nature and extent of scientific influence on marine environmental policy. Public perceptions of the nature and severity of marine pollution frequently differ from scientific assessments. the thesis of this paper is that the increasing influence of public perception on marine environmental protection policy is leading to the adoption of simplistic and unnecessarily extreme approaches to marine pollution prevention and to a reduced reliance on science. This trend is illustrated by some recent international developments and some suggestions are made towards enhancing the influence of science on marine protection policy.  相似文献   
138.
Currently, China is facing critical problems regarding the management of municipal solid waste (MSW). The failure of existing pilot programs in implementing MSW source-separated collection highlights the need to analyze the factors significantly influencing public participation in this activity. To this end, a comprehensive analysis of MSW source-separated collection in Guilin, which is representative of wider areas located in inland China and with a GDP around the national average, was conducted. The research consisted of in-person interviews involving a questionnaire and theoretical analyses in terms of public perception, public awareness, public attitude, and willingness to pay. The analytical results identify the status of waste source-separated collection and influencing factors in implementation, and provides exercisable suggestions for decision makers in both China and more generally in industrializing countries to design promotion programs and education campaigns.  相似文献   
139.
In addition to providing key ecological functions, large old trees are a part of a social realm and as such provide numerous social‐cultural benefits to people. However, their social and cultural values are often neglected when designing conservation policies and management guidelines. We believe that awareness of large old trees as a part of human identity and cultural heritage is essential when addressing the issue of their decline worldwide. Large old trees provide humans with aesthetic, symbolic, religious, and historic values, as well as concrete tangible benefits, such as leaves, branches, or nuts. In many cultures particularly large trees are treated with reverence. Also, contemporary popular culture utilizes the image of trees as sentient beings and builds on the ancient myths that attribute great powers to large trees. Although the social and cultural role of large old trees is usually not taken into account in conservation, accounting for human‐related values of these trees is an important part of conservation policy because it may strengthen conservation by highlighting the potential synergies in protecting ecological and social values. Incorporación del Significado Social y Cultural de Árboles Añejos a Políticas de Conservación  相似文献   
140.
分析了2009年9月26日美国对中国轮胎进口实施的特别保护措施,运用国际贸易和国际经济学的相关理论,对美国轮胎特保法案进行了剖析。在目前中美轮胎贸易情况下,从宏观和微观的角度探讨了轮胎贸易顺差形成的原因,以及长期和短期内对中国经济的影响,并对中国轮胎出口贸易提出了几点政策建议。  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