全文获取类型
收费全文 | 1883篇 |
免费 | 175篇 |
国内免费 | 457篇 |
专业分类
安全科学 | 174篇 |
废物处理 | 34篇 |
环保管理 | 299篇 |
综合类 | 1205篇 |
基础理论 | 268篇 |
环境理论 | 2篇 |
污染及防治 | 169篇 |
评价与监测 | 65篇 |
社会与环境 | 222篇 |
灾害及防治 | 77篇 |
出版年
2024年 | 3篇 |
2023年 | 31篇 |
2022年 | 44篇 |
2021年 | 52篇 |
2020年 | 60篇 |
2019年 | 67篇 |
2018年 | 53篇 |
2017年 | 93篇 |
2016年 | 91篇 |
2015年 | 95篇 |
2014年 | 99篇 |
2013年 | 169篇 |
2012年 | 178篇 |
2011年 | 172篇 |
2010年 | 138篇 |
2009年 | 143篇 |
2008年 | 100篇 |
2007年 | 143篇 |
2006年 | 136篇 |
2005年 | 98篇 |
2004年 | 77篇 |
2003年 | 57篇 |
2002年 | 73篇 |
2001年 | 43篇 |
2000年 | 37篇 |
1999年 | 40篇 |
1998年 | 24篇 |
1997年 | 29篇 |
1996年 | 26篇 |
1995年 | 31篇 |
1994年 | 16篇 |
1993年 | 16篇 |
1992年 | 17篇 |
1991年 | 18篇 |
1990年 | 5篇 |
1989年 | 10篇 |
1988年 | 4篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1981年 | 5篇 |
1980年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1972年 | 2篇 |
1971年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有2515条查询结果,搜索用时 548 毫秒
71.
In multiphase systems capillary pressures play a significant role on fluid movement and retention. The facility to predict
the effect of different thermal remediation strategies requires the knowledge of the effect of temperature on capillary pressure-saturation
relationships in the soils.
The objective of recent study was (a) to develop a technique for routinely measuring the pressure-saturation curves of soil
samples saturated with a nonpolar liquid at different regulated temperatures (b) to build a database using the measured pressure-saturation
curves and the physical, chemical properties of the model soils (c) to establish the dependence of nonaqueous phase liquid
retention on the soil properties and the temperature.
The retention curves (extraction isotherms) with nonaqueous phase liquid were determined using a modified
pressure plate extractor. The wetting phase was a non-aromatic hydrocarbon distillation product. Pressure plates were designed and constructed in
the laboratory of our department. The temperature was held constant at 20, 40 and 60 ∘C.
Statistical analysis was performed involving selected soil parameters and the measured nonaqueous phase liquid retention data.
The results show that knowing some easily measurable soil parameters (bulk density, particle size distribution, humus and
lime content) we can estimate the nonaqueous phase liquid retention of the soils. The measured “extraction isotherms” provide
essential information about the temperature-dependency of pressure-saturation curves. 相似文献
72.
73.
土地资源安全维系着国民经济能否可持续发展,而可持续发展是在不超过生态系统承载力条件下的一种安全发展模式。以中国大陆29个省市为例,研究了中国各省区的土地资源人口承载力,进而计算了我国土地资源的安全度。结果表明,我国各省区土地资源人口承载力存在明显的地域不均衡现象,超载与盈余并存;多数省份处于接近或超过土地资源人口承载临界值,我国土地资源安全状况不容乐观。 相似文献
74.
75.
76.
在环境评价中,污染源强的确定对环境影响因素评价的分析结果有重要作用。对锅炉房污染物排放的分析表明,影响锅炉房大气污染物的主要因素有燃料的构成、发热量和燃烧方式等。确定锅炉房大气污染物的方法主要有物料衡算法、实测法和经验系数法。在这三种方法中,物料衡算法被普遍采用。在确定锅炉房大气污染物的排放量时,也可以采用物料衡算法和实测法相结合的方法。 相似文献
77.
在推进新型城镇化和生态建设的背景下,客观定量评价区域生态环境状态,是当前我国生态建设重要而紧迫的任务之一。高密度的人类活动会对自然生态系统产生超负荷的压力,通过生态承载力的分析能够定量测度这种状况,为区域可持续发展提供借鉴意义。基于生态足迹模型,计算了2008年和2013年武汉城市圈各县域单元的生态足迹/承载力,并进行了时空变化分析。研究发现武汉城市圈各县域单元的生态足迹和生态承载力在空间上存在显著的差异性,生态足迹逐年增加,生态承载力的变化相对较小,出现两级分化的现象。根据生态足迹/承载力进行跨区县生态补偿测算,得到2008年和2013年武汉城市圈48个县域的转移支付情况,表明如果运用财政转移支付的手段,整个区域能够达到生态系统供给和需求动态平衡的目标,缓解武汉城市圈的生态压力,实现武汉城市圈的可持续发展。 相似文献
78.
Z. Aslıgül Göçmen James A. LaGro Jr. 《Journal of Environmental Planning and Management》2016,59(8):1513-1535
Smart growth and sustainability planning have, in recent years, become central issues in planning discourse. Scholars have argued that planning capacity at the local government level is critical for smart growth planning, and that planners have a fundamental role to play in advancing local and regional sustainability. In this paper, we investigate the extent to which local planning capacity enables communities to promote more sustainable, smart growth residential development. Based on a 2013 survey of 38 county and 53 municipal governments in the state of Wisconsin, USA, this study finds that the majority of the sample communities have permitted residential developments characterized as transit-oriented, New Urbanist, mixed use, infill developments, or conservation subdivisions as alternatives to low-density, automobile-dependent conventional developments. The study also finds that jurisdictions with higher planning capacities are more likely to overcome significant barriers to more sustainable residential development. 相似文献
79.
Zhenshu Wang Yunpeng Shi Xiaodi Wang Qi Zhang Shichao Qu 《International Journal of Green Energy》2016,13(12):1267-1280
The drying up of the fossil energy sources and the damage from unchecked carbon emissions demand the development of low carbon economy, which promotes the development of new energy sources, such as wind power and photovoltaic. However, the direct connections of wind/photovoltaic power into power grid bring great impacts on power systems, thus affecting the security and stability of power system operations, which challenges the power system dispatching. In despite of many methods for power system dispatch, lack of the models, for power system containing wind power and photovoltaic considering carbon trading and spare capacity variation (PSCWPCCTSCV), restricts the further optimal operations of power systems. This paper studies the economic dispatch modeling problem of power system containing wind power and photovoltaic, establishes the model of economic dispatch of PSCWPCCTSCV. On this basis, adaptive immune genetic algorithm is applied to conduct the economic operation optimization, which can provide the optimal carbon trading price and the optimal power distribution coefficient. Finally, simulations based on the newly proposed models are made to illustrate the economic dispatch of PSCWPCCTSCV. The results show that optimization with the proposed model can not only weaken the volatility of the new energy effectively, but also reduce carbon emissions and reduce power generation costs. 相似文献
80.
Moya Kneafsey Luke Owen Elizabeth Bos Kevin Broughton Margi Lennartsson 《Local Environment》2017,22(5):621-634
This paper discusses the extent to which charity-led initiatives can contribute to capacity building for food justice in England. The paper draws on evaluations of two projects run by the charity Garden Organic: the Master Gardener Programme, operating a network of volunteers who mentor households, schools and community groups to support local food growing, and the Sowing New Seeds programme, which engages “Seed Stewards” to work with communities to encourage the growing and cooking of “exotic” crops. Based on qualitative data about peoples’ motivations for participation and the benefits that are experienced, we interpret these projects as examples of capacity building for food justice. We suggest that whilst currently depoliticised, the “quiet” process of reskilling and awareness raising that occurs through shared gardening projects could have transformative potential for people’s relationship with food. Finally, we use our findings to raise critical questions and propose future research about food justice concepts and practices. 相似文献