全文获取类型
收费全文 | 384篇 |
免费 | 16篇 |
国内免费 | 12篇 |
专业分类
安全科学 | 39篇 |
废物处理 | 3篇 |
环保管理 | 30篇 |
综合类 | 223篇 |
基础理论 | 20篇 |
污染及防治 | 18篇 |
评价与监测 | 67篇 |
社会与环境 | 7篇 |
灾害及防治 | 5篇 |
出版年
2023年 | 1篇 |
2022年 | 3篇 |
2021年 | 4篇 |
2020年 | 10篇 |
2019年 | 3篇 |
2018年 | 10篇 |
2017年 | 16篇 |
2016年 | 18篇 |
2015年 | 11篇 |
2014年 | 15篇 |
2013年 | 34篇 |
2012年 | 16篇 |
2011年 | 17篇 |
2010年 | 14篇 |
2009年 | 25篇 |
2008年 | 14篇 |
2007年 | 20篇 |
2006年 | 20篇 |
2005年 | 17篇 |
2004年 | 9篇 |
2003年 | 10篇 |
2002年 | 12篇 |
2001年 | 11篇 |
2000年 | 13篇 |
1999年 | 9篇 |
1998年 | 25篇 |
1997年 | 14篇 |
1996年 | 16篇 |
1995年 | 4篇 |
1994年 | 10篇 |
1993年 | 3篇 |
1992年 | 4篇 |
1990年 | 1篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有412条查询结果,搜索用时 15 毫秒
81.
82.
83.
基于三次指数平滑模型的雾霾天气分析与预测 总被引:1,自引:0,他引:1
通过建立三次指数平滑模型,分析2002~2012年我国二氧化硫和烟尘的排放量以及每年在环境污染治理方面的投资总额等指标,得出未来3年内我国雾霾天气仍会频发的结论,并究其原因进行了分析。 相似文献
84.
ANDREW D. OLDS ROD M. CONNOLLY KYLIE A. PITT PAUL S. MAXWELL SHANKAR ASWANI SIMON ALBERT 《Conservation biology》2014,28(4):982-991
Conservation focuses on maintaining biodiversity and ecosystem functioning, but gaps in our knowledge of species biology and ecological processes often impede progress. For this reason, focal species and habitats are used as surrogates for multispecies conservation, but species‐based approaches are not widely adopted in marine ecosystems. Reserves in the Solomon Islands were designed on the basis of local ecological knowledge to conserve bumphead parrotfish (Bolbometopon muricatum) and to protect food security and ecosystem functioning. Bumphead parrotfish are an iconic threatened species and may be a useful surrogate for multispecies conservation. They move across tropical seascapes throughout their life history, in a pattern of habitat use that is shared with many other species. We examined their value as a conservation surrogate and assessed the importance of seascape connectivity (i.e., the physical connectedness of patches in the seascape) among reefs, mangroves, and seagrass to marine reserve performance. Reserves were designed for bumphead parrotfish, but also enhanced the abundance of other species. Integration of local ecological knowledge and seascape connectivity enhanced the abundance of 17 other harvested fish species in local reserves. This result has important implications for ecosystem functioning and local villagers because many of these species perform important ecological processes and provide the foundation for extensive subsistence fisheries. Our findings suggest greater success in maintaining and restoring marine ecosystems may be achieved when they are managed to conserve surrogate species and preserve functional seascape connections. Incorporación de Especies Sustitutas y de Conectividad Marina para Mejorar los Resultados de Conservación 相似文献
85.
介绍了恶臭物质对人体健康的影响,分析了舰艇舱室内常见恶臭物质的分类、气味性质及来源,比对了国内外恶臭污染控制的相关标准。通过分析恶臭污染物的检出频次、毒性效应、气味安全级别、综合分值和艇内危害等级等指标,提出了舰艇舱室环境中24种恶臭物质的优先控制名单,指出舰艇的通风设计和硬件设备改进对于控制恶臭污染也很重要。 相似文献
86.
87.
Development and Testing of a Physically Based Model of Streambank Erosion for Coupling with a Basin‐Scale Hydrologic Model SWAT 下载免费PDF全文
B. Narasimhan P.M. Allen S.V. Coffman J.G. Arnold R. Srinivasan 《Journal of the American Water Resources Association》2017,53(2):344-364
A comprehensive streambank erosion model based on excess shear stress has been developed and incorporated in the hydrological model Soil and Water Assessment Tool (SWAT). It takes into account processes such as weathering, vegetative cover, and channel meanders to adjust critical and effective stresses while estimating bank erosion. The streambank erosion model was tested for performance in the Cedar Creek watershed in north‐central Texas where streambank erosion rates are high. A Rapid Geomorphic field assessment (RAP‐M) of the Cedar Creek watershed was done adopting techniques developed by the Natural Resources Conservation Service (NRCS), and the stream segments were categorized into various severity classes. Based on the RAP‐M field assessment, erosion pin sites were established at seven locations within the severely eroding streambanks of the watershed. A Monte Carlo simulation was carried out to assess the sensitivity of different parameters that control streambank erosion such as critical shear stress, erodibility, weathering depth, and weathering duration. The sensitive parameters were adjusted and the model was calibrated based on the bank erosion severity category identified by the RAP‐M field assessment. The average observed erosion rates were in the range 25‐367 mm year?1. The SWAT model was able to reasonably predict the bank erosion rates within the range of variability observed in the field (R2 = 0.90; E = 0.78). Editor's note : This paper is part of the featured series on SWAT Applications for Emerging Hydrologic and Water Quality Challenges. See the February 2017 issue for the introduction and background to the series. 相似文献
88.
南通市某钢丝绳行业集中区降尘中重金属污染状况评价 总被引:1,自引:1,他引:0
针对南通市钢丝绳行业集中区重金属污染问题,分析降尘中的铅、镉、铬、铜、镍、铁、锌、锰等重金属含量,并采用污染指数法和地累积指数法对降尘中重金属污染状况进行评价。结果表明,该集中区降尘中重金属污染程度依次为Zn>Pb>Cd>Cu>Fe>Mn>Ni>Cr,铅、锌为主要污染因子,铅、锌污染级别均处于重污染级别。 相似文献
89.
政策支持是促进新能源汽车消费市场等商业化条件成熟的重要手段。近年来,中央和一些地方政府在新能源汽车需求市场培育的"供给侧"和"需求侧"都先后出台了相应的市场培育政策。"供给侧"和"需求侧"的政策功能与效果不完全相同,地方政府在选择和应用新能源汽车需求培育政策时面临着诸多困惑。论文尝试将基尼系数分解法引入到新能源汽车需求市场"供给侧"和"需求侧"政策实施效果的区域差异分析中,分析了我国培育新能源汽车消费市场培养"供给侧"和"需求侧"政策取向的分布情况以及现阶段政策取向所面临的困惑,应用我国新能源汽车试点推广城市数据开展了实证研究。结果表明,"供给侧"政策着力于改善新能源汽车消费市场供给体系的质量和效率,为需求市场持续发展提供驱动力量;"需求侧"政策着力于激发新能源汽车消费的积极性和购买能力,为需求市场持续发展提供拉动力量。"供给侧"和"需求侧"政策在不同收入水平区域试点城市中的实施效果存在差异,高收入区域试点城市"供给侧"和"需求侧"政策都有着明显效果,但是"供给侧"政策效果更为显著;中等收入区域试点城市"需求侧"政策效果十分显著,"供给侧"政策效果相对较弱;收入稍低区域试点城市则以"供给侧"政策效果更为显著,"需求侧"政策效果相对较弱。我国新能源汽车市场培育在"供给侧"和"需求侧"政策取向上应因地制宜,各有侧重点。 相似文献
90.
海岛旅游绿色发展生态补偿标准研究——以浙江舟山普陀旅游金三角为例 总被引:1,自引:0,他引:1
绿色发展是强调人与自然平等、人与自然和谐发展的新可持续发展观。海岛旅游绿色发展有利于保护旅游目的地的海洋生态系统与森林生态系统健康和减少旅游业对资源与环境的压力。运用海洋渔业生态标签制度(MFELS)、生态系统服务付费(PES)和市场替换法(MRM),对海岛旅游绿色发展生态补偿问题进行了研究,其中,旅游碳排放增量生态补偿(增汇或碳汇)主要依据是污染者付费原则、环境友好型海产品生态补偿主要依据是保护者得到补偿原则、生态系统服务付费主要依据是受益者付费原则;并以舟山普陀旅游金三角为案例地,以问卷调查和访谈调查获取的数据为基础,以2013年为评价基准年份,对海岛旅游绿色发展的生态补偿标准进行了评估。结果表明:海岛旅游绿色发展可获得6.53×108元的生态补偿资金,游客平均承担110.43元/人次的生态补偿标准。 相似文献