全文获取类型
收费全文 | 6536篇 |
免费 | 419篇 |
国内免费 | 1001篇 |
专业分类
安全科学 | 305篇 |
废物处理 | 78篇 |
环保管理 | 1528篇 |
综合类 | 3210篇 |
基础理论 | 1060篇 |
环境理论 | 9篇 |
污染及防治 | 188篇 |
评价与监测 | 217篇 |
社会与环境 | 1156篇 |
灾害及防治 | 205篇 |
出版年
2024年 | 51篇 |
2023年 | 102篇 |
2022年 | 205篇 |
2021年 | 232篇 |
2020年 | 235篇 |
2019年 | 212篇 |
2018年 | 237篇 |
2017年 | 333篇 |
2016年 | 352篇 |
2015年 | 288篇 |
2014年 | 249篇 |
2013年 | 443篇 |
2012年 | 436篇 |
2011年 | 467篇 |
2010年 | 394篇 |
2009年 | 318篇 |
2008年 | 318篇 |
2007年 | 434篇 |
2006年 | 445篇 |
2005年 | 329篇 |
2004年 | 274篇 |
2003年 | 279篇 |
2002年 | 221篇 |
2001年 | 180篇 |
2000年 | 159篇 |
1999年 | 142篇 |
1998年 | 91篇 |
1997年 | 61篇 |
1996年 | 84篇 |
1995年 | 46篇 |
1994年 | 47篇 |
1993年 | 42篇 |
1992年 | 28篇 |
1991年 | 31篇 |
1990年 | 29篇 |
1989年 | 9篇 |
1988年 | 14篇 |
1987年 | 9篇 |
1986年 | 10篇 |
1985年 | 6篇 |
1983年 | 10篇 |
1982年 | 11篇 |
1981年 | 9篇 |
1980年 | 20篇 |
1979年 | 7篇 |
1978年 | 8篇 |
1977年 | 11篇 |
1975年 | 13篇 |
1973年 | 7篇 |
1971年 | 7篇 |
排序方式: 共有7956条查询结果,搜索用时 250 毫秒
701.
Radical,reformist, and garden-variety neoliberal: coming to terms with urban agriculture's contradictions 总被引:2,自引:0,他引:2
Nathan McClintock 《Local Environment》2014,19(2):147-171
For many activists and scholars, urban agriculture in the Global North has become synonymous with sustainable food systems, standing in opposition to the dominant industrial agri-food system. At the same time, critical social scientists increasingly argue that urban agriculture programmes, by filling the void left by the “rolling back” of the social safety net, underwrite neoliberalisation. I argue that such contradictions are central to urban agriculture. Drawing on existing literature and fieldwork in Oakland, CA, I explain how urban agriculture arises from a protective counter-movement, while at the same time entrenching the neoliberal organisation of contemporary urban political economies through its entanglement with multiple processes of neoliberalisation. By focusing on one function or the other, however, rather than understanding such contradictions as internal and inherent, we risk undermining urban agriculture's transformative potential. Coming to terms with its internal contradictions can help activists, policy-makers and practitioners better position urban agriculture within coordinated efforts for structural change, one of many means to an end rather than an end unto itself. 相似文献
702.
Daniel J. Bain Erin M. Copeland Marion T. Divers Marijke Hecht Kristina G. Hopkins Justin Hynicka Michael Koryak Mary Kostalos Lisa Brown Emily M. Elliott Joseph Fedor Michele Gregorich Brady Porter Brenda Smith Christopher Tracey Margaret Zak 《Journal of the American Water Resources Association》2014,50(6):1608-1621
Urban stream restoration continues to be used as an ecological management tool, despite uncertainty about the long‐term sustainability and resilience of restored systems. Evaluations of restoration success often focus on specific instream indicators, with limited attention to the wider basin or parallel hydrologic and geomorphic process. A comprehensive understanding of urban stream restoration progress is particularly important for comparisons with nonurban sites as urban streams can provide substantial secondary benefits to urban residents. Here, we utilize a wide range of indicators to retrospectively examine the restoration of Nine Mile Run, a multi‐million dollar stream restoration project in eastern Pittsburgh (Pennsylvania, USA). Examination of available continuous hydrological data illustrates the high cost of failures to incorporate the data into planning and adaptive management. For example, persistent extreme flows drive geomorphic degradation threatening to reverse hydrologic connections created by the restoration and impact the improved instream biotic communities. In addition, human activities associated with restoration efforts suggest a positive feedback as the stream restoration has focused effort on the basin beyond the reach. Ultimately, urban stream restoration remains a potentially useful management tool, but continued improvements in post‐project assessment should include examination of a wider range of indicators. 相似文献
703.
Creating False Images: Stream Restoration in an Urban Setting 总被引:1,自引:0,他引:1
Kristan Cockerill William P. Anderson Jr. 《Journal of the American Water Resources Association》2014,50(2):468-482
Stream restoration has become a multibillion dollar business with mixed results as to its efficacy. This case study utilizes pre‐ and post‐monitoring data from restoration projects on an urban stream to assess how well stream conditions, publicly stated project goals, and project implementation align. Our research confirms previous studies showing little communication among academic researchers and restoration practitioners as well as provides further evidence that restoration efforts tend to focus on small‐scale, specific sites without considering broader land use patterns. This study advances our understanding of restoration by documenting that although improving ecological conditions is a stated goal for restoration projects, the implemented measures are not always focused on those issues that are the most ecologically salient. What these projects have accomplished is to protect the built environment and promote positive public perception. We argue that these disconnects among publicized goals for restoration, the implemented features, and actual stream conditions may create a false image of what an ecologically stable stream looks like and therefore perpetuate a false sense of optimism about the feasibility of restoring urban streams. 相似文献
704.
Few studies exist on how chloride from chloride‐based deicers is transported in infiltration‐based stormwater control measures. In 2009, the U.S. Environmental Protection Agency (USEPA) constructed a 0.4 ha parking lot in Edison, New Jersey, that was surfaced with permeable interlocking concrete pavers (PICP), pervious concrete (PC), and porous asphalt (PA). Each surface type has four equally sized, lined sections that direct all infiltrate to separate 5.7 m3 collection tanks. The USEPA acute criterion for aquatic life (860 mg/l) was exceeded in events immediately following a snow event. Concentrations of the infiltrate exceeded the detection limit (5 mg/l) year round but did not exceed the USEPA chronic toxicity (230 mg/l) after April. The chloride concentration decreased with cumulative rainfall since previous snow event, and a power regression described this relationship. In the power regression, the coefficient (b) described the initial concentration following a snow event, and the exponent (m) described the rate in which chloride was flushed through the system with infiltrating water. PC had the largest coefficient (5,664) and largest absolute exponent (?0.92), followed closely by PICP (b = 4,943 and m = ?0.87), and distantly by PA (b = 2,907 and m = ?0.67). The differences in release rate were proportional to the measured surface infiltration rates of 4,000; 2,400; and 200 cm/h for PC, PICP, and PA, respectively. These results will assist those who manage or regulate stormwater where receiving waters are chloride impaired. 相似文献
705.
706.
707.
从低碳经济视角出发,运用基于遗传算法的投影寻踪模型对武汉城市圈低碳土地节约基于利用水平进行了评价研究.结果显示,各市低碳土地节约集约利用水平差异较大,发展极不协调,难以有效地实现城市圈协同发展.武汉城市圈应以整体效益最大化为目标,注重保护环境与经济增长相结合,大力发展低碳经济,以协同发展促进低碳土地利用. 相似文献
708.
Abstract: In a time of increasing urbanization, the fundamental value of conserving urban biodiversity remains controversial. How much of a fixed budget should be spent on conservation in urban versus nonurban landscapes? The answer should depend on the goals that drive our conservation actions, yet proponents of urban conservation often fail to specify the motivation for protecting urban biodiversity. This is an important shortcoming on several fronts, including a missed opportunity to make a stronger appeal to those who believe conservation biology should focus exclusively on more natural, wilder landscapes. We argue that urban areas do offer an important venue for conservation biology, but that we must become better at choosing and articulating our goals. We explored seven possible motivations for urban biodiversity conservation: preserving local biodiversity, creating stepping stones to nonurban habitat, understanding and facilitating responses to environmental change, conducting environmental education, providing ecosystem services, fulfilling ethical responsibilities, and improving human well‐being. To attain all these goals, challenges must be faced that are common to the urban environment, such as localized pollution, disruption of ecosystem structure, and limited availability of land. There are, however, also challenges specific only to particular goals, meaning that different goals will require different approaches and actions. This highlights the importance of specifying the motivations behind urban biodiversity conservation. If the goals are unknown, progress cannot be assessed. 相似文献
709.
结合深圳盐田区城中村污水完善改造设计及施工服务中所遇到的问题,提出为彻底解除雨水污水混流现象而采取的措施和方法,以作为今后城中村雨水污水分流制改造过程中的借鉴或参考。 相似文献
710.
大城市污水处理工艺的经济选择因素 总被引:3,自引:0,他引:3
城市污水处理设施的建设是今后改善我国城市环境的重要任务之一,其具体工艺和技术的选择除了对污水治理的结果产生影响外,更重要的是直接影响对设施建设的投入强度和运行效果,建议从经济和技术结合的角度研究比较各种技术和工艺,去探讨经济技术最佳结合的方法。 相似文献