全文获取类型
收费全文 | 5464篇 |
免费 | 459篇 |
国内免费 | 1605篇 |
专业分类
安全科学 | 616篇 |
废物处理 | 674篇 |
环保管理 | 959篇 |
综合类 | 3383篇 |
基础理论 | 442篇 |
环境理论 | 2篇 |
污染及防治 | 1035篇 |
评价与监测 | 288篇 |
社会与环境 | 111篇 |
灾害及防治 | 18篇 |
出版年
2024年 | 23篇 |
2023年 | 112篇 |
2022年 | 151篇 |
2021年 | 210篇 |
2020年 | 203篇 |
2019年 | 154篇 |
2018年 | 176篇 |
2017年 | 243篇 |
2016年 | 312篇 |
2015年 | 278篇 |
2014年 | 446篇 |
2013年 | 457篇 |
2012年 | 465篇 |
2011年 | 442篇 |
2010年 | 288篇 |
2009年 | 350篇 |
2008年 | 292篇 |
2007年 | 350篇 |
2006年 | 405篇 |
2005年 | 319篇 |
2004年 | 249篇 |
2003年 | 278篇 |
2002年 | 224篇 |
2001年 | 185篇 |
2000年 | 190篇 |
1999年 | 151篇 |
1998年 | 126篇 |
1997年 | 80篇 |
1996年 | 77篇 |
1995年 | 66篇 |
1994年 | 61篇 |
1993年 | 47篇 |
1992年 | 34篇 |
1991年 | 16篇 |
1990年 | 11篇 |
1989年 | 6篇 |
1988年 | 2篇 |
1987年 | 6篇 |
1986年 | 3篇 |
1984年 | 3篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1981年 | 4篇 |
1980年 | 6篇 |
1979年 | 5篇 |
1977年 | 3篇 |
1976年 | 2篇 |
1973年 | 3篇 |
1971年 | 3篇 |
1970年 | 1篇 |
排序方式: 共有7528条查询结果,搜索用时 15 毫秒
111.
Yasundo?KurataEmail author Yusaku?Ono Yoshiro?Ono 《Journal of Material Cycles and Waste Management》2008,10(2):144-152
The concentrations of 41 phenols in leachates from 38 municipal solid waste (MSW) landfill sites in Japan were measured. The
main phenols detected in leachates were phenol, three cresols, 4-tert-butylphenol, 4-tertoctylphenol, 4-nonylphenol, bisphenol
A, and some chlorophenols. The concentration levels of phenols were affected by the pH values of the leachates and the different
types of landfill waste. The origins of phenol and p-cresol were considered to be incineration residues, and the major origin of 4-tert-butylphenol, bisphenol A, and 2,4,6-trichlorophenol
was considered to be solidified fly ash. In contrast, the major origins of 4-tert-octylphenol and 4-nonylphenol were considered
to be incombustibles. The discharge of leachates to the environment around MSW landfill sites without water treatment facilities
can cause environmental pollution by phenols. In particular, the disposal of incineration residues including solidified fly
ash and the codisposal of solidified fly ash and incombustibles might raise the possibility of environmental pollution. Moreover,
the discharge of leachates at pH values of 9.8 or more could pollute the water environment with phenol. However, phenol, 4-nonylphenol,
and bisphenol A can be removed to below the con centration levels that impact the environment around landfill sites by a series
of conventional water treatment processes. 相似文献
112.
Source water protection planning (SWPP) is an approach to prevent contamination of ground and surface water in watersheds where these resources may be abstracted for drinking or used for recreation. For SWPP the hazards within a watershed that could contribute to water contamination are identified together with the pathways that link them to the water resource. In rural areas, farms are significant potential sources of pathogens. A risk-based index can be used to support the assessment of the potential for contamination following guidelines on safety and operational efficacy of processes and practices developed as beneficial approaches to agricultural land management. Evaluation of the health risk for a target population requires knowledge of the strength of the hazard with respect to the pathogen load (massxconcentration). Manure handling and on-site wastewater treatment systems form the most important hazards, and both can comprise confined and unconfined source elements. There is also a need to understand the modification of pathogen numbers (attenuation) together with characteristics of the established pathways (surface or subsurface), which allow the movement of the contaminant species from a source to a receptor (water source). Many practices for manure management have not been fully evaluated for their impact on pathogen survival and transport in the environment. A key component is the identification of potential pathways of contaminant transport. This requires the development of a suitable digital elevation model of the watershed for surface movement and information on local groundwater aquifer systems for subsurface flows. Both require detailed soils and geological information. The pathways to surface and groundwater resources can then be identified. Details of land management, farm management practices (including animal and manure management) and agronomic practices have to be obtained, possibly from questionnaires completed by each producer within the watershed. To confirm that potential pathways are active requires some microbial source tracking. One possibility is to identify the molecular types of Escherichia coli present in each hazard on a farm. An essential part of any such index is the identification of mitigation strategies and practices that can reduce the magnitude of the hazard or block open pathways. 相似文献
113.
114.
废旧电池资源化、无害化 总被引:8,自引:0,他引:8
对当前国内外在废旧电池的处理处置方面进行了综合性论述,对废旧电池的危害及当前应采取的对策进行分析。 相似文献
115.
利用餐饮业废油脂制造生物柴油 总被引:37,自引:0,他引:37
世界的石油产量将会逐渐减少,石化柴油燃烧后所排放的废气是造成的城市空气污染的主要原因,生物柴油是石化柴油很好的替代能源,文章介绍了国外废油脂处理利用和甸餐饮业废油脂的概况,提出了利用餐饮业废油脂制造生物柴油的方法和工艺流程,并讨论了利用餐饮业废油脂制造生物柴油的几个问题。 相似文献
116.
分子筛生产废水中悬浮物的絮凝与回用 总被引:2,自引:0,他引:2
对分子筛生产废水进行了絮凝沉降分离试验,确定了絮凝剂、助凝剂及絮凝敢分离条件。试验结果表明,絮凝沉降所得到的絮凝物料的化学组成、结构、性能与絮凝前原废水中的悬浮物基本一致,可返回原生产工序中使用。 相似文献
117.
有机废气中VOC的回收方法 总被引:33,自引:1,他引:33
介绍了炭吸附法、冷凝法和膜分离法回胥机废报中VOD的原理、工艺流程和工业应用情况,并对这些方法进行了比较,指出了适用范围。 相似文献
118.
为了降低平煤十矿己15-16-24130工作面运输巷掘进中的突出危险性,基于实际工程背景,考虑瓦斯抽采中的瓦斯运移及煤岩变形等因素,建立了瓦斯抽采气固耦合模型,并利用COMSOL Multiphysics软件对平煤十矿己15-16煤层的底板巷穿层钻孔瓦斯抽采方案进行数值模拟,研究了瓦斯抽采对于降低掘进过程中突出危险性的影响。研究结果表明:在己18煤层开挖底板巷对己15-16煤层进行穿层钻孔瓦斯抽采,瓦斯抽采180 d后,己15-16-24130工作面运输巷附近煤层残余瓦斯压力及瓦斯含量分别降至0.315 MPa和3.84 m3/t;将底板巷穿层钻孔瓦斯抽采方案进行工程应用,实测抽采后的残余瓦斯压力及瓦斯含量在0.32 MPa和3.17 m3/t,均小于平煤十矿煤与瓦斯突出防治规定的“双6”指标(残余瓦斯压力小于0.6 MPa,残余瓦斯含量小于6 m3/t),可有效降低运输巷掘进过程中的突出危险性。 相似文献
119.
Biodiesel produced by transesterification of waste animal oil is a promising green fuel in the future. ZnO-Al2O3 and ZnO/Zn2Al composition oxides were prepared by co-precipitation method and impregnation method, respectively. The above catalysts were characterized by X-ray diffraction (XRD), Brunauer--Emmett--Teller (BET) and CO2 adsorption and temperature-programmed desorption (CO2-TPD) and show that the high activity for the catalyst is attributed to its high alkalinity. The reaction parameters were optimized and the results show that the transesterification ratio of waste animal oil can reach 98.7% with 10% ZnO/Zn2Al catalyst after 2 h. Moreover, 10%ZnO/Zn2Al compound oxides can be active for the successive cycles. The glycerol as a predominant by-product after transesterification is of high purity with high use value. 相似文献
120.
生命周期评价理论与方法作为一种量化环境影响的工具,在诸多领域中得到了广泛的应用。在垃圾处理领域,生命周期评价最早在20世纪90年代得到应用。生命周期评价与城市生活垃圾处理的有效结合,将促进城市生活垃圾的减量化、资源化、无害化目标的实现。总结了生命周期评价理论与方法在城市生活垃圾处理中的应用现状。对国内不同城市生活垃圾处理方式环境影响因子进行比较分析,诸如全球变暖潜力、酸化潜力和富营养化潜力等因子。针对其目标范围定义、数据收集、评价方法的选择、结果解释及工艺改进等方面指出了目前研究的局限性和不足。并对未来城市生活垃圾处理生命周期评价的发展方向进行展望。 相似文献