全文获取类型
收费全文 | 2890篇 |
免费 | 161篇 |
国内免费 | 1087篇 |
专业分类
安全科学 | 177篇 |
废物处理 | 160篇 |
环保管理 | 237篇 |
综合类 | 1700篇 |
基础理论 | 474篇 |
环境理论 | 1篇 |
污染及防治 | 998篇 |
评价与监测 | 130篇 |
社会与环境 | 124篇 |
灾害及防治 | 137篇 |
出版年
2024年 | 2篇 |
2023年 | 63篇 |
2022年 | 169篇 |
2021年 | 124篇 |
2020年 | 120篇 |
2019年 | 112篇 |
2018年 | 107篇 |
2017年 | 129篇 |
2016年 | 159篇 |
2015年 | 185篇 |
2014年 | 219篇 |
2013年 | 282篇 |
2012年 | 237篇 |
2011年 | 280篇 |
2010年 | 225篇 |
2009年 | 206篇 |
2008年 | 189篇 |
2007年 | 185篇 |
2006年 | 174篇 |
2005年 | 93篇 |
2004年 | 75篇 |
2003年 | 99篇 |
2002年 | 83篇 |
2001年 | 66篇 |
2000年 | 77篇 |
1999年 | 78篇 |
1998年 | 66篇 |
1997年 | 65篇 |
1996年 | 60篇 |
1995年 | 49篇 |
1994年 | 42篇 |
1993年 | 38篇 |
1992年 | 19篇 |
1991年 | 12篇 |
1990年 | 11篇 |
1989年 | 8篇 |
1988年 | 5篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1977年 | 1篇 |
1972年 | 2篇 |
1918年 | 1篇 |
1917年 | 1篇 |
1916年 | 1篇 |
排序方式: 共有4138条查询结果,搜索用时 46 毫秒
991.
Bin Men Haozheng Wang Mengchang He Chunye Lin Xiangchun Quan 《Environmental monitoring and assessment》2011,177(1-4):515-526
Nitroaromatic compounds are known to be hazardous to ecological and human health. To assess the status of nitroaromatic compounds contamination in the main rivers in the important industrial bases of the northeastern China, we collected water, suspended particulate matter (SPM) and sediment samples from 28 sites in the Daliao River watershed and analysed them for eight nitroaromatic compounds by gas chromatography. The total concentrations of eight nitrobenzenes in the water column including aqueous and SPM phases ranged from 740 to 15,828 ng L???1, with a mean concentration of 3,460 ng L???1. The total concentrations of eight nitrobenzenes in the sediment were 7.47 to 8,185.76 ng g???1, with a mean concentration of 921.98 ng g???1, and several times higher than those found from the Yellow River in China. 4-Nitrotoluene was the predominant contaminant in the water and sediment of the three rivers of the Daliao River watershed. 2,6-Dichloro-4-nitroaniline was generally dominant in the SPM. The levels of nitroaromatic compounds were different among different sites in the Daliao River watershed, mainly caused by the distribution of pollution sources. No obvious correlation was found between the total concentrations of eight nitrobenzenes concentrations and TOC or the slit-clay content of the sediments. 相似文献
992.
Jia He Cun-Kuan Bao Ting-Fei Shu Xiao-Xue Yun Dahe Jiang Lex BrwonAuthor vitae 《Environmental Impact Assessment Review》2011,31(6):549-560
Sustainable development or sustainability has been highlighted as an essential principle in urban master planning, with increasing recognition that uncontrollable urbanization may well give rise to various issues such as overexploitation of natural resources, ecosystem destruction, environmental pollution and large-scale climate change. Thus, it is deemed necessary to modify the existing urban and regional administrative system so as to cope with the challenges urban planning is being confronted with and realize the purpose of urban sustainability. This paper contributed to proposing a mechanism which helps to make urban planning with full consideration of issues with respect to sustainable development. We suggested that the integration of urban planning, SEA and ecological planning be a multi-win strategy to offset deficiency of each mentioned political tool being individually applied. We also proposed a framework where SEA and ecological planning are fully incorporated into urban planning, which forms a two-way constraint mechanism to ascertain environmental quality of urban planning, although in practice, planning and SEA processes may conditionally be unified. Moreover, as shown in the case study, the integration of the three political tools may be constrained due to slow changes in the contextual factors, in particular the political and cultural dimensions. Currently within the context of China, there may be three major elements which facilitate integration of the three political tools, which are (1) regulatory requirement of PEIA on urban planning, (2) the promotion or strong administrative support from government on eco-district building, and (3) the willingness of urban planners to collaborate with SEA experts or ecologists. 相似文献
993.
Haibo Niu Zhengkai Li Kenneth Lee Paul Kepkay Joseph V. Mullin 《Environmental Modeling and Assessment》2011,16(1):61-75
Spilled oil can interact with suspended particles in marine environments and form oil–mineral aggregates (OMAs). Some OMAs
with densities higher than seawater density can settle to the seedbed to pose potential risks to benthic organisms. To understand
the transport and fate of oil associated with OMAs and evaluate their potential risks, an integrated hydrodynamic and fate/transport
model has been used in a hypothetical case study of 1,000 tonnes of South Louisiana oil spilled in the Bristol Channel. Several
scenarios have been simulated under different wave and current conditions. By using OMA properties derived from laboratory
measurements reported in literature, it has been found that the risk to the benthos is unlikely for the two hypothetical cases
with strong currents, but it is likely for the wave only (weak current) case. The effects of other factors such as OMA properties
and sediment concentration were also examined in terms of their effects on the transport process and risks. 相似文献
994.
安全生产关系到国家财产和人民群众的生命安全,关系着全社会的和谐,关系到改革开放、经济发展和社会稳定的大局.…… 相似文献
995.
何国良 《安全.健康和环境》2007,7(2):44-46
简要分析了轻质油品外浮顶储罐的火灾特点、火灾类型以及灭火方法,重点对密封圈火灾和浮顶爆炸火灾的扑救力量部署进行了分析确定. 相似文献
996.
分析了一起由竹夹板着火引起的空罐爆炸事故,事故原因是竹夹板被点燃后,燃烧产生大量一氧化碳、氢气和甲烷,从而引发了爆炸事故,提出了预防类似事故的措施. 相似文献
997.
998.
999.
1000.
邻苯二甲酸酯类化合物正辛醇-水分配系数的QSPR研究 总被引:4,自引:3,他引:1
采用PM3算法计算邻苯二甲酸酯类化合物(PAEs)的量子化学参数,应用偏最小二乘(PLS)算法建立了PAEs的正辛醇-水分配系数(KOW)的定量结构-性质相关(QSPR)模型.模型的结果表明,用量子化学参数建立的QSPR模型相关性显著,具有较好的稳健性和预测能力,因此,利用该模型可对其他PAEs分子的lgKOW值进行初步预测.模型的结果表明,影响lgKOW的主要量子化学参数是分子总能量TE、相对分子质量Mr、平均分子极化率α和分子生成热ΔHf.lgKOW随着Mr和α的增大而增大,随着TE和ΔHf的增大而减小. 相似文献