全文获取类型
收费全文 | 16586篇 |
免费 | 1056篇 |
国内免费 | 1762篇 |
专业分类
安全科学 | 2567篇 |
废物处理 | 235篇 |
环保管理 | 3430篇 |
综合类 | 6961篇 |
基础理论 | 1707篇 |
环境理论 | 7篇 |
污染及防治 | 766篇 |
评价与监测 | 776篇 |
社会与环境 | 2208篇 |
灾害及防治 | 747篇 |
出版年
2024年 | 36篇 |
2023年 | 229篇 |
2022年 | 391篇 |
2021年 | 476篇 |
2020年 | 478篇 |
2019年 | 417篇 |
2018年 | 358篇 |
2017年 | 546篇 |
2016年 | 618篇 |
2015年 | 559篇 |
2014年 | 650篇 |
2013年 | 1086篇 |
2012年 | 1196篇 |
2011年 | 1251篇 |
2010年 | 899篇 |
2009年 | 897篇 |
2008年 | 714篇 |
2007年 | 1066篇 |
2006年 | 1043篇 |
2005年 | 888篇 |
2004年 | 787篇 |
2003年 | 718篇 |
2002年 | 685篇 |
2001年 | 508篇 |
2000年 | 579篇 |
1999年 | 466篇 |
1998年 | 330篇 |
1997年 | 287篇 |
1996年 | 208篇 |
1995年 | 224篇 |
1994年 | 196篇 |
1993年 | 147篇 |
1992年 | 112篇 |
1991年 | 65篇 |
1990年 | 53篇 |
1989年 | 28篇 |
1988年 | 20篇 |
1987年 | 19篇 |
1986年 | 21篇 |
1985年 | 8篇 |
1984年 | 7篇 |
1982年 | 20篇 |
1981年 | 12篇 |
1980年 | 18篇 |
1979年 | 16篇 |
1978年 | 16篇 |
1977年 | 9篇 |
1973年 | 6篇 |
1972年 | 7篇 |
1971年 | 14篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
进行区域生态建设,必须以生态经济学原理为指导,以协调经济,社会,环境,建设为主要对象。我国生态示范区有生态农业,农工商一体化,生态旅游,生态破坏恢复和城市化等类型。通海县生态示范区通过优化产业结构,综合治理札麓湖,建设基础设施和重视科教等主要措施,取得了明显的经济,生态和社会效益。 相似文献
2.
战略环境评价的工作程序 总被引:18,自引:1,他引:18
介绍了战略环境评价(法规、政策、计划和规划层次)工作程序的三个环节:评价方案的制定、评价实施和评价总结。并提出了战略环境评价指标体系制定的原则、战略环境评价的具体步骤及战略环境评价报告书的基本内容。 相似文献
3.
安徽月山地区是长江中下游地区的重要成岩-成矿区段。本文通过岩石学、岩石化学和同位素地球化学等方面的研究,探讨和阐明了月山地区闪长岩类的形成环境、物质来源、源区特征、岩浆形成与演化机理等。 相似文献
4.
This paper explores the practical application of life cycle assessment (LCA) to product system development. While life cycle assessment methods have been studied and demonstrated extensively over the last two decades, their application to product design and development has not been critically addressed. Many organizational and operational factors limit the integration of the three LCA components (inventory analysis, impact assessment and improvement assessment) with product development. Design of the product system can be considered a synthesis of individual decisions and choices made by the design team, which ultimately shape the system's environmental profile. The environmental goal of life cycle design is to minimize the aggregate environmental impacts associated with the product system. Appropriate environmental information must be supplied to decision makers throughout each stage of the development process to achieve this goal. LCA can serve as a source of this information, but informational requirements can vary as the design moves from its conceptual phase, where many design choices are possible, to its detailed design and implementation. Streamlined approaches and other tools, such as design checklists, are essential. The practical use of this tool in product development also depends on the nature and complexity of the product system (e.g. new vs. established), the product development cycle (time-to-market constraints), availability of technical and financial resources, and the design approach (integrated vs. serial). These factors will influence the role and scope of LCA in product development. Effective communication and evaluation of environmental information and the integration of this information with cost, performance, cultural and legal criteria will also be critical to the success of design initiatives based on the life cycle framework. An overview of several of these design initiatives will be presented. 相似文献
5.
不可再生资源利用率度量指标研究 总被引:1,自引:0,他引:1
通过分析指出不可再生资源利用率是度量可持续发展的一个重要尺度。从产值与不可再生资源消耗相比较的角度出发 ,设置了不可再生资源利用率的度量指标 :单位工业增加值不可再生资源消耗 ,并以中国为例 ,分别以重量与能值为尺度 ,计算以上所设置指标的指标值 ,并对计算结果进行分析与思考。 相似文献
6.
7.
本文将多目标二级决策法用于城市环境系统的权重分配,对城中环境系统各要素及各要素的表征参数进行客观自动赋权,克服了环境质量评价中权重分配的主观随意性。该方法物理意义清晰,算法简便,具有较好的应用价值。 相似文献
8.
In this paper we deal with the problem of identifying environmental principles for the design and operation of supply chains. The operations that are included in supply chains are briefly described along with the approaches that are applied in order to improve their environmental performance. A background of environmental principles for achieving eco-efficiency and building of environmentally friendly organizational systems is presented and emphasis is put on the application of such principles “from cradle to grave”. Then, environmental principles applicable to particular objects of logistics networks planning are identified and commented upon. In addition, selective case studies from the literature, which show the applicability of the formulated principles and their relevance to practice, are discussed. The paper concludes with some remarks regarding the benefits for companies and societies, in general, that occur as a result of the application of the formulated principles. 相似文献
9.
Influence of new town development on the urban heat island - The case of the Bundang area 总被引:3,自引:0,他引:3
SONG Young-bae 《环境科学学报(英文版)》2005,17(4):641-645
Five new towns have been developed around the Seoul metropolitan area since 1996. However, these new towns generate lots of traffic and related problems in the areas including those new towns and Seoul as a result of increases in population and a lack of ecological-self-sufficiency. Currently, construction of another new town is under deliberation, and what should be a major consider is the notion that the new town be located within a wide, green zone. Many studies have revealed that green space can play an important role in improving urban eco-meteorological capability and air quality. In order to analyze the urban heat island which will be created by the new urban development, and to investigate the local thermal environment and its negative effects caused by a change of land use type and urbanization, Landsat TM images were used for extraction of urban surface temperature according to changes of land use over the last 15 years. These data are analyzed together with digital land use and topographic information. As a study result, it was found the urban heat island of the study area from 198.5 to 1999 rapidly developed which showed a difference of mean temperature above 2.0. Before the Bundang new town construction the temperature of the residential area was the same as a forest, but during the new town construction in 1991 analysis revealed the creation of an urban heat island. The temperature of a forest whose size is over 50% of the investigation area was lowest, and thus the presence of a forest is believed to have a direct cooling effect on the urban environment and its surroundings. The mean temperature of the residential and commercial areas in the study was found to be 4.5 higher than the forest, and therefore this part of land use is believed to be the main factor causing the temperature increase of the urban heat island. 相似文献
10.