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   851篇
  免费   63篇
  国内免费   37篇
安全科学   81篇
废物处理   9篇
环保管理   339篇
综合类   204篇
基础理论   113篇
环境理论   5篇
污染及防治   22篇
评价与监测   37篇
社会与环境   107篇
灾害及防治   34篇
  2023年   10篇
  2022年   12篇
  2021年   15篇
  2020年   15篇
  2019年   35篇
  2018年   22篇
  2017年   30篇
  2016年   40篇
  2015年   34篇
  2014年   17篇
  2013年   41篇
  2012年   43篇
  2011年   40篇
  2010年   30篇
  2009年   41篇
  2008年   44篇
  2007年   59篇
  2006年   46篇
  2005年   38篇
  2004年   36篇
  2003年   34篇
  2002年   24篇
  2001年   16篇
  2000年   25篇
  1999年   22篇
  1998年   28篇
  1997年   12篇
  1996年   9篇
  1995年   10篇
  1994年   10篇
  1993年   12篇
  1992年   3篇
  1991年   6篇
  1990年   8篇
  1988年   8篇
  1987年   7篇
  1986年   2篇
  1985年   3篇
  1984年   4篇
  1983年   4篇
  1982年   4篇
  1981年   4篇
  1980年   7篇
  1979年   7篇
  1978年   5篇
  1977年   4篇
  1976年   4篇
  1973年   3篇
  1972年   4篇
  1971年   9篇
排序方式: 共有951条查询结果,搜索用时 406 毫秒
11.
The lessons of history indicate that mismanagement of natural resources and the environment often leads to potentially adverse consequences.The increasing interest in economic development,particularly in the developing countries of the world coupled with increasing population pressures and the globalization of economic activity is placing noticeable stresses on the ultimate sustainability of both human and environmental systems.Sustainable development is not a new concept.It has been an area of concern for different elements of society for some time.Yet efforts to understand the implications of sustainable development have not,until recently,been formalized.We have focused singularly on economic development and environmental quality as if they were mutually exclusive.This paper focuses on the concept of concurrency as both a conceptual framework and practicable method of understanding and implementing the ecology and economy of sustainability.  相似文献   
12.
本文回顾了灾害经济学的发展历程,分析了灾害经济学的理论框架及与其他学科的关系,从经济学的角度阐述了建立这一学科的必要性,并探讨了建立这一学科的基础条件.全文从经济学的角度阐述了建立这一学科的必要性.并探讨了建立这一学科所要研究的理论知识.  相似文献   
13.
从绿色贸易壁垒谈中国农产品贸易的对策思路   总被引:6,自引:0,他引:6  
本文运用环境经济学的理论和方法 ,分析了 WTO中的绿色贸易壁垒从质量、成本、营销三个方面对中国农产品贸易产生的影响以及中国目前农产品贸易的形式 ,提出中国在入世后农产品贸易全球化发展中所应采取的对策和建议  相似文献   
14.
试论地震台站的组织结构和激励机制建设   总被引:1,自引:0,他引:1  
本文对地震台站在新时期的台站管理进行了论述。指出在防震减灾基础建设的重要时期,地震台站的管理,首先需要转变管理理念,同时应完善组织结构建设,建立激励机制。这是完成中国地震局确定的《与时俱进、开拓创新,为全面实现地震台站的现代化而奋斗》重要工作之一。  相似文献   
15.
简要介绍了裂变径迹定年的分析方法 ,实验技术 (包括单矿物分选、制片、抛磨、蚀刻及径迹测量技术 )的研究现状、存在的问题及发展趋势  相似文献   
16.
研究了一种快速、灵敏、可靠的高温氢还原-气相色谱分析方法[1-2],并自行设计了高温还原系统(还原炉、六通阀等),测定半导体生产排放废气和废水中的砷、磷、硫及其化合物,样品不需预处理,使气相色谱仪能直接测定固、液、气相样品中砷、磷、硫及其化合物的含量。砷、磷、硫的检测限分别为0.01mg/L、0.003mg/L、0.02mg/L;相对标准偏差分别为6.2%、8.6%和0.3%,与经典方法进行对比,结果基本一致。从分析方法的误差统计角度,也说明该方法准确、可靠。  相似文献   
17.
The term biodiversity describes the array of interacting, genetically distinct populations and species in a region, the communities they comprise, and the variety of ecosystems of which they are functioning parts. Ecosystem health, a closely related concept, is described in terms of a process identifying biological indicators, end points, and values. The decline of populations or species, an accelerating trend worldwide, can lead to simplification of ecosystem processes, thus threatening the stability and sustainability of ecosystem services directly relevant to human welfare in the chain of economic and ecological relationships. The challenge of addressing issues of such enormous scope and complexity has highlighted the limitations of ecology-as-science. Additionally, biosphere-scale conflicts seem to lie beyond the scope of conventional economics, leading to differences of opinion about the commodity value of biodiversity and of the services that intact ecosystems provide. In the face of these uncertainties, many scientists and economists have adopted principles that clearly assign burdens of proof to those who would promote the loss of biodiversity and that also establish near-trump (preeminent) status for ecological integrity. Electric utility facilities and operations impact biodiversity whenever construction, operation, or maintenance of generation, delivery, and support facilities alters landscapes and habitats and thereby impacts species. Although industry is accustomed to dealing with broad environmental concerns (such as global warming or acid rain), the biodiversity issue invokes hemisphere-wide, regional, local, and site-specific concerns all at the same time. Industry can proactively address these issues of scope and scale in two main ways: first, by aligning strategically with the broad research agenda put forth by informed scientists and institutions; and second, by supporting focused management processes whose results will contribute incrementally to the broader agenda of rebuilding or maintaining biodiversity.  相似文献   
18.
Economists have tried to estimate the demand for recreation under conditions of congestion, struggling especially with a model that uses observed rather than stated behaviour to obtain results. This paper reports statistical analyses of data on perceptions, mitigating behaviour and management preferences in order to highlight the difficulties related to empirical analysis of congestion. We offer evidence that may be of assistance to those wishing to construct measures of congestion for use in an observed behaviour model. The results may also be useful to recreation area managers who can implement a quota or permit system or change site entry or access fees to control access to the site they manage.  相似文献   
19.
文章针对黄冈市矿业经济发展的需要,在充分考虑黄冈市地区经济发展,矿产资源分布,矿业经济合理布局的必要性的基础上,对黄冈市矿业经济布局作了详细深入研究,提出了“一个中心,四个矿业规划区,五类开发矿种,十个矿业基地”的布局构架,为该市矿业经济发展提供了明确的发展思路,并指出了发展重点,也为政府宏观调控和矿政管理提供了依据。  相似文献   
20.
Agricultural economics has, until the 1990s, enjoyeda reputation for relevance and usefulness to theagri-food industry and policy-makers. Thatreputation has been jeopardized by a growinginfatuation with models and quantification, and aconcomitant underemphasis placed on many complexproblems and issues of society. An illustrativeexample is explored, using agriculturalactivity-related damage to the natural resourcebase, environment and ecology. Agriculturaleconomists are urged to respond by broadening theirterms of reference and joining forces with otherdisciplines.  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