全文获取类型
收费全文 | 495篇 |
免费 | 50篇 |
国内免费 | 309篇 |
专业分类
安全科学 | 39篇 |
废物处理 | 43篇 |
环保管理 | 27篇 |
综合类 | 351篇 |
基础理论 | 112篇 |
污染及防治 | 240篇 |
评价与监测 | 16篇 |
社会与环境 | 5篇 |
灾害及防治 | 21篇 |
出版年
2024年 | 3篇 |
2023年 | 14篇 |
2022年 | 32篇 |
2021年 | 36篇 |
2020年 | 38篇 |
2019年 | 21篇 |
2018年 | 35篇 |
2017年 | 54篇 |
2016年 | 34篇 |
2015年 | 46篇 |
2014年 | 43篇 |
2013年 | 50篇 |
2012年 | 63篇 |
2011年 | 63篇 |
2010年 | 36篇 |
2009年 | 33篇 |
2008年 | 57篇 |
2007年 | 28篇 |
2006年 | 30篇 |
2005年 | 14篇 |
2004年 | 10篇 |
2003年 | 20篇 |
2002年 | 17篇 |
2001年 | 15篇 |
2000年 | 12篇 |
1999年 | 16篇 |
1998年 | 6篇 |
1997年 | 5篇 |
1996年 | 8篇 |
1995年 | 4篇 |
1993年 | 3篇 |
1992年 | 5篇 |
1991年 | 2篇 |
1990年 | 1篇 |
排序方式: 共有854条查询结果,搜索用时 15 毫秒
31.
Potential particulate pollution derived from UV-induced degradation of
odorous dimethyl sulfide 总被引:1,自引:0,他引:1
UV-induced degradation of odorous dimethyl sulfide (DMS) was carried out in a static White cell chamber with UV irradiation. The
combination of in situ Fourier transform infrared (FT-IR) spectrometer, gas chromatograph-mass spectrometer (GC-MS), wide-range
particle spectrometer (WPS) technique, filter sampling and ion chromatographic (IC) analysis was used to monitor the gaseous and
potential particulate products. During 240 min of UV irradiation, the degradation e ciency of DMS attained 20.9%, and partially
oxidized sulfur-containing gaseous products, such as sulfur dioxide (SO2), carbonyl sulfide (OCS), dimethyl sulfoxide (DMSO),
dimethyl sulfone (DMSO2) and dimethyl disulfide (DMDS) were identified by in situ FT-IR and GC-MS analysis, respectively.
Accompanying with the oxidation of DMS, suspended particles were directly detected to be formed by WPS techniques. These
particles were measured mainly in the size range of accumulation mode, and increased their count median diameter throughout
the whole removal process. IC analysis of the filter samples revealed that methanesulfonic acid (MSA), sulfuric acid (H2SO4) and
other unidentified chemicals accounted for the major non-refractory compositions of these particles. Based on products analysis and
possible intermediates formed, the degradation pathways of DMS were proposed as the combination of the O(1D)- and the OH- initiated
oxidation mechanisms. A plausible formation mechanism of the suspended particles was also analyzed. It is concluded that UV-induced
degradation of odorous DMS is potentially a source of particulate pollutants in the atmosphere. 相似文献
32.
某市室内空气中甲醛污染调查与分析 总被引:3,自引:0,他引:3
通过问卷调查与现场检测明确某市室内空气中甲醛污染状况与甲醛浓度的影响因素。普通居民住宅内甲醛污染状况严重,在9套普通居民住宅中测定的26个房间样本,甲醛合格率仅为30.8%。在校园4个公共活动区测定的10个样本中,合格率为90.0%,污染状况较轻微。结果表明,室内甲醛浓度最主要的影响因素是大量建筑装饰材料的使用,其次是装修完工时间和通风换气量及频次。同时甲醛浓度与室内温度和相对湿度等其他因素有关。 相似文献
33.
34.
35.
南太平洋和加勒比海国家是我国开展应对气候变化南南合作的重点对象之一。目前我国已通过应对气候变化物资赠送、培训等方式与部分国家开展了气候变化合作,但总体来看尚处于探索阶段,对其合作需求了解得尚不够深入,且缺乏整体系统性的谋划和战略。通过调查问卷、面对面访谈和分析现有合作相结合的方式,发现南太平洋和加勒比海国家应对气候变化合作需求主要集中在资金支持、能力建设和基础设施建设等方面。未来,我国可通过在现有合作框架下与南太平洋和加勒比海国家展开气候合作,打造气候变化的战略共识;不断优化和深化目前开展的应对气候变化南南合作项目,提高合作的针对性;通过抓重点领域开展深度合作等方式不断加强合作,提升我国在全球气候治理方面的影响力;做好舆论宣传工作,加强在气候治理经验方面的交流;开展多方合作;鼓励私营部门交流,增强互信程度。 相似文献
36.
Hongli Wang Qian Wang Jianmin Chen Changhong Chen Cheng Huang Liping Qiao Shengrong Lou Jun Lu 《环境科学学报(英文版)》2015,(1):290-297
The characteristic ratios of volatile organic compounds(VOCs) to i-pentane, the indicator of vehicular emissions, were employed to apportion the vehicular and non-vehicular contributions to reactive species in urban Shanghai. Two kinds of tunnel experiments, one tunnel with more than 90% light duty gasoline vehicles and the other with more than 60% light duty diesel vehicles, were carried out to study the characteristic ratios of vehicle-related emissions from December 2009 to January 2010. Based on the experiments, the characteristic ratios of C6–C8aromatics to i-pentane of vehicular emissions were 0.53 ± 0.08(benzene), 0.70 ± 0.12(toluene),0.41 ± 0.09(m,p-xylenes), 0.16 ± 0.04(o-xylene), 0.023 ± 0.011(styrene), and 0.15 ± 0.02(ethylbenzene), respectively. The source apportionment results showed that around 23.3% of C6–C8 aromatics in urban Shanghai were from vehicular emissions, which meant that the non-vehicular emissions had more importance. These findings suggested that emission control of non-vehicular sources, i.e. industrial emissions, should also receive attention in addition to the control of vehicle-related emissions in Shanghai. The chemical removal of VOCs during the transport from emissions to the receptor site had a large impact on the apportionment results. Generally, the overestimation of vehicular contributions would occur when the VOC reaction rate constant with OH radicals(k OH) was larger than that of the vehicular indicator, while for species with smaller k OH than the vehicular indicator, the vehicular contribution would be underestimated by the method of characteristic ratios. 相似文献
37.
38.
39.
40.
城市污水处理厂作为城市污水处理的重要承担者,其处理能力不足势必会对下游水体产生严重影响,也给水体的再生利用带来了难度,污水处理厂的去除效率变得尤为关注。以2014年3-12月天津市某污水处理厂氮的监测数据为基础,对其脱氮效率进行了评价。结果表明:污水处理厂脱氮效率偏低,总氮平均去除率为55.61%,且出水仅达到二级排放标准(GB 18918-2002),水厂进水C/N、水温对总氮的去除效率影响很大;水厂氨氮的平均去除率为87.40%,其去除率受进水NH4+-N浓度影响很大,水厂对高浓度的进水NH4+-N(大于70 mg/L)去除效率偏低,而进水NH4+-N小于60 mg/L时,出水NH4+-N基本能满足一级A排放标准(GB 18918-2002);水厂出水的亚硝态氮含量很高,其主要受溶解氧和C/N的影响;水厂对有机氮的去除效果不佳,需要采用深度处理技术。 相似文献