全文获取类型
收费全文 | 2952篇 |
免费 | 91篇 |
国内免费 | 682篇 |
专业分类
安全科学 | 110篇 |
废物处理 | 202篇 |
环保管理 | 245篇 |
综合类 | 1144篇 |
基础理论 | 608篇 |
环境理论 | 3篇 |
污染及防治 | 948篇 |
评价与监测 | 177篇 |
社会与环境 | 169篇 |
灾害及防治 | 119篇 |
出版年
2023年 | 37篇 |
2022年 | 128篇 |
2021年 | 89篇 |
2020年 | 49篇 |
2019年 | 60篇 |
2018年 | 105篇 |
2017年 | 80篇 |
2016年 | 103篇 |
2015年 | 139篇 |
2014年 | 151篇 |
2013年 | 240篇 |
2012年 | 147篇 |
2011年 | 206篇 |
2010年 | 180篇 |
2009年 | 173篇 |
2008年 | 171篇 |
2007年 | 130篇 |
2006年 | 136篇 |
2005年 | 93篇 |
2004年 | 141篇 |
2003年 | 113篇 |
2002年 | 101篇 |
2001年 | 150篇 |
2000年 | 98篇 |
1999年 | 79篇 |
1998年 | 71篇 |
1997年 | 74篇 |
1996年 | 54篇 |
1995年 | 63篇 |
1994年 | 35篇 |
1993年 | 45篇 |
1992年 | 34篇 |
1991年 | 23篇 |
1990年 | 21篇 |
1989年 | 15篇 |
1988年 | 14篇 |
1987年 | 17篇 |
1986年 | 7篇 |
1985年 | 12篇 |
1984年 | 13篇 |
1983年 | 8篇 |
1982年 | 6篇 |
1981年 | 10篇 |
1980年 | 6篇 |
1975年 | 8篇 |
1974年 | 10篇 |
1973年 | 7篇 |
1972年 | 12篇 |
1959年 | 5篇 |
1957年 | 5篇 |
排序方式: 共有3725条查询结果,搜索用时 46 毫秒
41.
近年来,随着环境监测技术规范化建设的不断发展,国家环保部相继出台了包括火力发电、水泥制造、汽车制造、造纸工业在内的12个不同行业类型的建设项目竣工验收技术规范。然而,造纸污泥综合利用热电项目验收监测尚未列入规范编制日程,其中工程调查、标准制定、点位布设和报告编制等环节仍存在一定误区和难点。文章例从上述薄弱环节入手,对常见难点问题提出了相应的解决办法,可供广大环境监测工作者参考和借鉴。 相似文献
42.
变电站倒闸操作风险分析与控制 总被引:1,自引:0,他引:1
分析了变电站倒闸操作过程的风险及造成操作失误的原因,从运行值班人员的管理、安全工具的使用、关键点控制和事故应急处理等方面,提出倒闸操作风险的控制措施,以防范事故的发生,确保变电站的安全运行。 相似文献
43.
44.
抚顺市大气重金属污染的植物监测与分析研究 总被引:1,自引:0,他引:1
采用生物富集原理,利用松针对抚顺地区大气中重金属元素的分布情况进行了监测与分析,结果表明:抚顺地区三种不同的松树对不同金属元素的富集能力是不同的,总体上看沙松的富集能力略高于油松和落叶松;工业区、交通干道和居民区松针中富集的金属含量高于农村地区;从不同的海拔高度上来看,在500米以下的低空大气中金属元素的分布量比高海拔地区高;不同金属元素间存在一定的相关关系。 相似文献
45.
Baohua Tang Lingyan Zhu Qixing Zhou 《Frontiers of Environmental Science & Engineering in China》2011,5(1):99-110
The joint toxicity of Penta-BDE (Pe-BDE) and heavy metals including cadmium and copper on Daphnia magna (D. magna) was evaluated on the basis of determining the 48 h survival, antioxidative enzyme responses, and lipid peroxidation. The
response was classified as additive, greater than additive, or less than additive by comparing the measured “toxic units,
TU” with one. Based on the survival of D. magna, less-than-additive interactions were found in most of mixtures treatments. This may be attributed to the different toxicity
mechanism between Pe-BDE and metals. Cu and Cd played a greater role in toxicity than what Pe-BDE did. As for the superoxide
dismutase (SOD) and catalase (CAT) activity, most response was less than additive. For the glutathione S-transferases (GST) activity, most of the greater-thanadditive responses were found in the Cu plus Pe-BDE treatments, but
the additive responses occurred in Cd plus Pe-BDE treatments and binary metal treatments. For lipid peroxide levels, which
were measured as malondialdehyde (MDA) levels, less-than-additive response occurred in the 50% Cd plus 50% Cu and ternary
mixture treatments. Results suggested that Pe-BDE, Cd, and Cu could induce different patterns of antioxidant enzyme responses,
such as antioxidant/prooxidant responses, depending on their capability to produce reactive oxygen species and antioxidant
enzymes to detoxify them. 相似文献
46.
47.
48.
Sedimentary record of polycyclic aromatic hydrocarbons in Lake Erhai,
Southwest China 总被引:1,自引:0,他引:1
Jianyang Guo Zhang Liang Haiqing Liao Zhi Tang Xiaoli Zhao Fengchang Wu 《环境科学学报(英文版)》2011,23(8):1308-1315
The temporal distribution of polycyclic aromatic hydrocarbons (PAHs) was investigated in a sediment core from Lake Erhal in Southwest China using gas-chromatography/mass spectrometry (GC/MS) method.The total organic carbon (TOC) normalized total PAHs concentrations (sum of US Environmental Protection Agency proposed 16 priority PAHs) ranged from 31.9 to 269 μg/g dry weight (dw),and were characterized by a slowly increasing stage in the deeper sediments and a sharp increasing stage in the upper sediments.The PAHs in the sediments were dominated by low molecular weight (LMW) PAHs,suggesting that the primary source of PAHs was low- and moderate temperature combustion processes.However,both the significant increase in high molecular weight (HMW) PAHs in the upper sediments and the vertical profile of diagnostic ratios pointed out a change in the sources of PAHs from low-temperature combustion to high-temperature combustion.The ecotoxicological assessment based on consensus-based sediment quality guidelines implied that potential adverse biological impacts were possible for benzo(ghi)perylenelene and most LMW PAHs.In addition,the total BaP equivalent quotient of seven carcinogenic polycyclic aromatic hydrocarbons (BaA,CHr,BbF,BkF,BaP,DBA and INP) was 106.1 ng/g,according to the toxic equivalency factors.Although there was no great biological impact associated with the HMW PAlls,great attention should be paid to these PAH components based on their rapid increase in the upper sediments. 相似文献
49.
Xinxin Wang Zhen Han Zhihui Bai Jingchun Tang Anzhou M Jizheng He Guoqiang Zhuang 《环境科学学报(英文版)》2011,23(11):1858-1864
The impact of petroleum on archaeal community in salinealkali soils was investigated, which will expand the knowledge of the archaeal population involved in the natural attenuation of hydrocarbons in extreme environments. 相似文献
50.
Chih Ming M Ya Wen Lee Gui Bing Hong Te Li Su Je Lueng Shie Chang Tang Chang 《环境科学学报(英文版)》2011,23(4):687-692
TiO2 nanoparticles, doped with di erent Pt contents, were prepared by a modified photodeposition method using Degussa P-25 TiO2,
H2PtCl6 6H2O and methanol as the solvents. The physicochemical properties of Pt/TiO2 were investigated by the nitrogen adsorption
and desorption isotherm measurement technique, X-ray di raction analysis and photoluminescence spectra, respectively. Reaction rates
from photocatalytic removal of dichloromethane over Degussa P-25 TiO2 and Pt/TiO2 were evaluated. The average diameter and BET
surface area of the TiO2 catalyst particles were 300 nm and 50 m2/g, respectively. The degradation e ciency was 99.0%, 82.7%, 55.2%,
and 57.9% with TiO2 at inlet concentrations of 50, 100, 200, and 300 ppm, respectively. And the degradation e ciency was 99.3%,
79.7%, 76.5%, and 73.4% with a 0.005 wt.% Pt/TiO2 at inlet concentrations of 50, 100, 200, and 300 ppm, respectively. In addition, we
found that the photoluminescence emission peak intensities decreased with increases in the doping amount of Pt, which indicates that
the irradiative recombination was weakened. Furthermore, the results showed that the UV/0.005 wt.% Pt/TiO2 process was capable of
e ciently decomposing gaseous DCM in air. 相似文献