全文获取类型
收费全文 | 189篇 |
免费 | 30篇 |
国内免费 | 8篇 |
专业分类
安全科学 | 14篇 |
环保管理 | 59篇 |
综合类 | 98篇 |
基础理论 | 8篇 |
污染及防治 | 7篇 |
评价与监测 | 20篇 |
社会与环境 | 17篇 |
灾害及防治 | 4篇 |
出版年
2024年 | 2篇 |
2023年 | 6篇 |
2022年 | 6篇 |
2021年 | 6篇 |
2020年 | 14篇 |
2019年 | 5篇 |
2018年 | 2篇 |
2017年 | 16篇 |
2016年 | 19篇 |
2015年 | 20篇 |
2014年 | 6篇 |
2013年 | 8篇 |
2012年 | 7篇 |
2011年 | 18篇 |
2010年 | 11篇 |
2009年 | 6篇 |
2008年 | 10篇 |
2007年 | 8篇 |
2006年 | 10篇 |
2005年 | 2篇 |
2004年 | 6篇 |
2003年 | 5篇 |
2002年 | 8篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 8篇 |
1998年 | 4篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1992年 | 1篇 |
1989年 | 1篇 |
1985年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有227条查询结果,搜索用时 367 毫秒
101.
中国的污水处理与水环境管理政策 总被引:1,自引:0,他引:1
孙锡凯 《中国环境管理干部学院学报》2003,13(2):5-7
中国已建有420座污水处理厂,城市污水处理率达30%以上。但污水处理任务仍很艰巨,必须采取加强工业污染防治,建设大批新的污水处理厂和控制面源污染等对策。 相似文献
102.
建设一个良好的机动车排放实验室,规划与配套是关键。首先必须有一个良好的整体规划,其次应根据拟建实验室规模合理进行布局,重点应注意水电、标准气体、消防与通风设施、废气排放等方面合理配套。 相似文献
103.
104.
105.
106.
107.
Jonathon J. Valente James W. Rivers Zhiqiang Yang S. Kim Nelson Joseph M. Northrup Daniel D. Roby Carolyn B. Meyer Matthew G. Betts 《Conservation biology》2023,37(5):e14091
Understanding how habitat fragmentation affects individual species is complicated by challenges associated with quantifying species-specific habitat and spatial variability in fragmentation effects within a species’ range. We aggregated a 29-year breeding survey data set for the endangered marbled murrelet (Brachyramphus marmoratus) from >42,000 forest sites throughout the Pacific Northwest (Oregon, Washington, and northern California) of the United States. We built a species distribution model (SDM) in which occupied sites were linked with Landsat imagery to quantify murrelet-specific habitat and then used occupancy models to test the hypotheses that fragmentation negatively affects murrelet breeding distribution and that these effects are amplified with distance from the marine foraging habitat toward the edge of the species’ nesting range. Murrelet habitat declined in the Pacific Northwest by 20% since 1988, whereas the proportion of habitat comprising edges increased by 17%, indicating increased fragmentation. Furthermore, fragmentation of murrelet habitat at landscape scales (within 2 km of survey stations) negatively affected occupancy of potential breeding sites, and these effects were amplified near the range edge. On the coast, the odds of occupancy decreased by 37% (95% confidence interval [CI] –54 to 12) for each 10% increase in edge habitat (i.e., fragmentation), but at the range edge (88 km inland) these odds decreased by 99% (95% CI 98 to 99). Conversely, odds of murrelet occupancy increased by 31% (95% CI 14 to 52) for each 10% increase in local edge habitat (within 100 m of survey stations). Avoidance of fragmentation at broad scales but use of locally fragmented habitat with reduced quality may help explain the lack of murrelet population recovery. Further, our results emphasize that fragmentation effects can be nuanced, scale dependent, and geographically variable. Awareness of these nuances is critical for developing landscape-level conservation strategies for species experiencing broad-scale habitat loss and fragmentation. 相似文献
108.
Spatial dynamics of Mediterranean coastal regions 总被引:1,自引:0,他引:1
Berardo Cori 《Journal of Coastal Conservation》1999,5(2):105-112
During recent decades the northern shores of the Mediterranean have experienced a rapid transformation; mainly due to touristic development. At present, more than 25% of the worldÕs hotel accommodation is found in the Mediterranean. This paper presents some figures illustrating the related growth of different sectors of coastal economy, such as housing, tourism, industry and traffic. A better control of these developments is urgently needed. To this end a spatial planning policy should be elaborated which fully incorporates environmental issues. The concept of integrated coastal (zone) management has only recently been introduced in regional and national policies. A classification of spatial dynamics including settlement-environment relationships can stimulate the implementation of integrated planning policies in the coastal belt of the Mediterranean region. 相似文献
109.
110.
为量化评估太原市“十四五”大气污染防治政策的减污降碳协同效益,使用京津冀温室气体-空气污染相互作用与协同模型(GAINS-JJJ),模拟评估13项大气污染防治措施的减排潜力,CO2的协同减排效益.2025年政策情景下一次PM2.5、PM10、SO2、NOx、VOCs和NH3分别减排1.8(5%,相对于基准情景减排比例,下同)、2.5(2%)、3.7(16%)、20.0(27%)、13.6(15%)和0.0 kt(0%),CO2减排9.0 Mt(13%),CH4排放增加203.3 kt(相对于基准情景增加25%).SO2、NOx与VOCs减排主要发生在电力、工业燃烧与溶剂使用部门,CO2减排主要发生在工业燃烧部门,CH4排放量增加是由于煤矿开采活动水平升高.限制“双高”行业的能源消耗,严禁新增产能以及可再生能源发电比例提升措施的CO2协同减排效益最高.VOCs具有优异协同减碳效益.建议太原市进一步推进终端电气化政策,同时需加大提升电力行业清洁能源比重和可再生能源发电的消纳能力. 相似文献