全文获取类型
收费全文 | 6231篇 |
免费 | 209篇 |
国内免费 | 219篇 |
专业分类
安全科学 | 253篇 |
废物处理 | 92篇 |
环保管理 | 1867篇 |
综合类 | 2015篇 |
基础理论 | 652篇 |
环境理论 | 2篇 |
污染及防治 | 132篇 |
评价与监测 | 131篇 |
社会与环境 | 1367篇 |
灾害及防治 | 148篇 |
出版年
2023年 | 35篇 |
2022年 | 89篇 |
2021年 | 111篇 |
2020年 | 102篇 |
2019年 | 81篇 |
2018年 | 75篇 |
2017年 | 133篇 |
2016年 | 133篇 |
2015年 | 101篇 |
2014年 | 170篇 |
2013年 | 403篇 |
2012年 | 337篇 |
2011年 | 397篇 |
2010年 | 274篇 |
2009年 | 268篇 |
2008年 | 255篇 |
2007年 | 393篇 |
2006年 | 397篇 |
2005年 | 328篇 |
2004年 | 333篇 |
2003年 | 312篇 |
2002年 | 311篇 |
2001年 | 259篇 |
2000年 | 284篇 |
1999年 | 223篇 |
1998年 | 162篇 |
1997年 | 140篇 |
1996年 | 100篇 |
1995年 | 90篇 |
1994年 | 75篇 |
1993年 | 70篇 |
1992年 | 41篇 |
1991年 | 20篇 |
1990年 | 24篇 |
1989年 | 8篇 |
1988年 | 8篇 |
1987年 | 11篇 |
1986年 | 15篇 |
1985年 | 4篇 |
1984年 | 5篇 |
1982年 | 12篇 |
1981年 | 7篇 |
1980年 | 10篇 |
1979年 | 12篇 |
1978年 | 9篇 |
1977年 | 5篇 |
1975年 | 4篇 |
1974年 | 3篇 |
1973年 | 4篇 |
1971年 | 9篇 |
排序方式: 共有6659条查询结果,搜索用时 31 毫秒
81.
山地区生态承载力计算及提升对策研究——以重庆市渝北区为例 总被引:1,自引:0,他引:1
山地区生态环境比较脆弱,在经济社会发展的影响下,山地区的生态承载力呈不断下降的趋势。本文在论述生态承载力内涵和计算方法的基拙上,以2008年《重庆统计年鉴》、2008年《重庆渝北统计年鉴》以及2007年渝北区土地利用现状数据为依据,对重庆市渝北区2007年的生态足迹和生态承载力进行了计算与分析,并进一步分析了山地区土地生态赤字产生的原因,包括人口多,坡地多,土壤和大气污染严重等,提出了控制人口数量和质量、大力发展山地区生态农业、优化能源结构等相应的对策。 相似文献
82.
83.
中国水源地保护与城镇发展矛盾较为突出。在现有水源保护区分级管理制度下,仅对排污口控制,不足以保障水源地安全。在污染物排放破坏水源地环境的表象下,水源地城镇的功能布局和建设方式是影响水源地安全的本质原因,而相关的管控措施十分缺乏。低冲击发展模式是城市与自然和谐相处的一种发展模式,它有利于保障水的健康循环,减轻水污染及保护水源地生态环境,是从根本上保护水源地安全的规划途径之一。因此,水源地保护应在全流域视角下,采取低冲击发展模式对建设进行合理引导。 相似文献
84.
环境问题已经引起世界各国政府和全社会的广泛关注。环境保护是利用环境科学的理论和方法,协调人类与自然环境的关系,以保护和改善环境的一切人类活动的总称。本文将首先分析由化学物质引起环境污染的案例,进而给出进行环境友好型的化学科学研究的方法及其重要性,以及通过化学科学的不断发展来解决业已存在的环境污染问题。 相似文献
85.
董恒年 《环境与可持续发展》2011,36(4)
环境标志是政府管理部门或非政府组织(团体)向有关申报者颁发并表明其产品或服务符合国际或国家环境标准与保护要求的特定标志。我国目前已经形成了以绿色食品标志与有机食品标志为代表的农产品环境标志制度、以中国环境标志为代表的制造业及建筑产品环境标志制度和以能效标识为代表的能效标识制度,以及低碳产品认证制度。我国环境标志产品生产与出口取得了显著成绩,但与发展水平高的国家和地区比较,还存在较大的发展差距。 相似文献
86.
87.
Cara A.M. BondiAuthor Vitae 《Journal of Cleaner Production》2011,19(5):429-437
Hazardous chemicals are pervasive in household disinfectant products. Many ingredients have established associations with acute and chronic human health conditions as well as with environmental damage. Although these associations are suggested but not proven, they are of great concern. This article describes the application of the precautionary principle to the selection of an anti-microbial active ingredient for a botanical disinfectant when significant uncertainty exists around the hazard and risk of traditional disinfectant active ingredients. We show that application of the precautionary principle does not stifle innovation and facilitates a responsible approach to product development. 相似文献
88.
Some emerging technologies are expected to be pivotal for solving many of the environmental challenges faced today, especially those related to energy. However, many of these technologies may incur significant environmental impacts over their life cycle, while having environmental benefits during their use. This paper presents results of a Life Cycle Assessment (LCA) of a proposed type of nanophotovoltaic, quantum dot photovoltaic (QDPV) module. The LCA is confined to the stages of raw materials acquisition, manufacturing, and use. The impacts of QDPV are compared with other types of PV modules and energy sources - both renewable and nonrenewable. To provide a comprehensive comparative assessment, QDPV modules were compared with mature as well as emerging PV types for which data are available. Comparative assessment with other types of energy sources includes coal, oil, lignite, natural gas, diesel, nuclear, wind, and hydropower.QDPV modules may have the potential to overcome two current barriers of solar technology: low efficiencies and high manufacturing costs. If higher efficiencies are realized, QDPV modules could pave the way to large scale implementation of solar energy, helping nations move toward greater energy independence. On the other hand, candidate materials as quantum dots for solar cell applications are mostly compound semiconductors such as cadmium selenide, cadmium telluride, and lead sulfide which may be toxic and for which renewable options are limited. Toxic effects of these materials may be exacerbated by their nanoscale features.The LCA was carried out using the software SimaPro, and the Ecoinvent Life Cycle Inventory (LCI) database supplemented with available literature and patent information. Our results indicate that while QDPV modules have shorter Energy PayBack Time (EPBT), lower Global Warming Potential (GWP), SOx and NOx emissions than other types of PV modules, they have higher heavy metal emissions, underscoring the need for investigation of emerging technologies, especially nano-based ones, from a life cycle perspective. QDPV modules are better in all impact categories assessed than carbon-based energy sources but they have longer EPBT than wind and hydropower and higher GWP. 相似文献
89.
Rupert J. Baumgartner 《Journal of Cleaner Production》2011,19(8):783-786
Sustainable development has been intensely debated for more than twenty years, but real progress of our societies to become more sustainable is very slow. Therefore this special issue provides a forum for critical perspectives of Sustainable Development Research and Practice. The papers are grouped into three clusters: a. Sustainability Science, b. Economic Problems and c. Corporate Contributions to Sustainable Development.Although a single special issue cannot address the entire array of issues pertaining to progress of sustainability related research, the selected papers highlight special aspects of sustainability research either due to their theoretical contributions or because they report on valuable empirical evidence. The main goal of sustainability research should be to contribute to our understanding of sustainability problems and to develop and help to implement solutions to solve them. This can be described as the relevance of sustainability research. A precondition to gain relevance is the rigor of sustainability science: it has to be based on solid scientific principles and methods. Additionally it has to be regarded that Sustainable Development is dynamic and that it has both normative and practical aspects. It is concluded that sustainability science and practice should be based upon these four central aspects: rigor, relevance, normative aspects and dynamic 相似文献
90.