全文获取类型
收费全文 | 18936篇 |
免费 | 970篇 |
国内免费 | 6659篇 |
专业分类
安全科学 | 1466篇 |
废物处理 | 1174篇 |
环保管理 | 1466篇 |
综合类 | 10755篇 |
基础理论 | 3045篇 |
环境理论 | 8篇 |
污染及防治 | 6273篇 |
评价与监测 | 802篇 |
社会与环境 | 715篇 |
灾害及防治 | 861篇 |
出版年
2024年 | 25篇 |
2023年 | 315篇 |
2022年 | 907篇 |
2021年 | 830篇 |
2020年 | 692篇 |
2019年 | 621篇 |
2018年 | 759篇 |
2017年 | 918篇 |
2016年 | 863篇 |
2015年 | 1073篇 |
2014年 | 1470篇 |
2013年 | 1938篇 |
2012年 | 1612篇 |
2011年 | 1752篇 |
2010年 | 1290篇 |
2009年 | 1258篇 |
2008年 | 1342篇 |
2007年 | 1114篇 |
2006年 | 988篇 |
2005年 | 704篇 |
2004年 | 536篇 |
2003年 | 641篇 |
2002年 | 551篇 |
2001年 | 464篇 |
2000年 | 505篇 |
1999年 | 570篇 |
1998年 | 488篇 |
1997年 | 460篇 |
1996年 | 427篇 |
1995年 | 344篇 |
1994年 | 275篇 |
1993年 | 223篇 |
1992年 | 157篇 |
1991年 | 128篇 |
1990年 | 80篇 |
1989年 | 70篇 |
1988年 | 53篇 |
1987年 | 25篇 |
1986年 | 26篇 |
1985年 | 12篇 |
1984年 | 17篇 |
1983年 | 15篇 |
1982年 | 13篇 |
1981年 | 8篇 |
1980年 | 1篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 984 毫秒
91.
青铜峡铝厂氟污染对广武乡玉米影响的调查分析 总被引:1,自引:0,他引:1
监测了青铜峡铝厂东南方向4.5km的广武乡玉米叶,得知含氟量为43.94-166.1mg/kg,对照样品树新林场玉米叶的含氟均值为13.15mg/kg,广武乡的玉米受到了严重的氟污染,农作物减产严重。 相似文献
92.
小清河水体和沿岸地下水中有机污染物的监测及其毒性分析 总被引:4,自引:0,他引:4
本文对小清河水体和沿岸地下水中的有机污染物进行了色-质联用分析,共检出有机污染物13类93种。并对其毒性效应进行了分析和评价。 相似文献
93.
针对目前我国环境影响评价领域普遍采用的有限边界岸边排放稳态二维混合模式的局限性和不精确性,本文对由河流二维稳态水质模型的基本方程推求出的有限边界岸边排放的二维稳态混合模式的解析解的各项进行分析比较。同时针对费休的混合长度公式进行了计算比较。 相似文献
94.
A novel analytical method has been established for on-line simultaneous determination of fluorene and acenaphthene,chrysene and benzo[a]anthracene (B[a]A) by polarization synchronous fluoromet.y (PSF) coupled to high performance liquid chromatography (HPLC). The detection limits were: 0.039, 0.046, 0.016 and 0.042 mgL-1 for fluorene, acenaphthene, chrysene and B[a]A, respectively. The proposed method has been successfisily applied to simultaneous determination of these PAHs in environmental air and marine sediment samples. 相似文献
95.
96.
Determination of Trace Organochlorinated Pesticides and Polychlorinated Biphenyls in Water 总被引:1,自引:0,他引:1
Zou Shichun Zhang Zhanxia Sheng Guoying Min Yushun Fu Jiamo 《Environmental monitoring and assessment》1997,44(1-3):563-568
A modified steam distillation liquid-liquid extraction (SDE) device is developed for the enrichment of trace organochlorinated pesticides (OCPs) and polychlorinated biphenyls (PCBs) in up to one litre of water samples. One ml of n-hexane is sufficient to extract the analytes. The extract can be analysed directly by a capillary gas chromatography-electron capture detector. The recoveries range from 84.6 to 102.3% for OCPs and 80.5 to 106.2% for PCBs, respectively. Matrice materials such as lipids and humic substances were removed by the SDE method from the extract and no further cleanup and concentration steps were needed. 相似文献
97.
A study on the orbit of air temperature movement 总被引:1,自引:0,他引:1
Zong-Chang Yang 《Environmental Modeling and Assessment》2007,12(2):131-143
In this paper, we describe an air temperature movement by mapping its time series to the polar coordinates: the value of the
time series is plotted on the radial coordinate and the time on the angular coordinate. In this way, both the yearly and daily
air temperature movements from five different locations of China are used to demonstrate that, in an intuitionistic view,
air temperature movement is neither random nor chaotic, but has its own orbit. We then propose an elliptic orbit model for
the air temperature movement. Our proposed model provides quite good results when it is applied to the evaluation of yearly
air temperature movements in eight locations in various parts of the world, and the evaluation of daily air temperature movements
in five locations in Hunan Province of China on December 17, 2005. Results show that our approach provides a concise and helpful
model for air temperature analysis. 相似文献
98.
Solvent microextraction (SME) was applied to the extraction of polycyclic aromatic hydrocarbons (PAHs) from spiked and real environmental soil samples with different matrices. Soil sample was mixed with 7 mL of acetone and 14 mL of water to allow partitioning of the PAHs from the soil to the liquid phase. A 2 microL octane drop suspended from a microsyringe needle tip was then immersed into the stirred solution-soil mixture for extraction. After an 11 min extraction, the octane drop was withdrawn into the syringe and injected directly into the GC for identification and quantification. The whole analysis procedure took 27 min, with an extraction time of 11 min, and a GC separation time of 16 min. A second extraction could be undertaken whilst the GC is running, hence the GC run time currently limits the sample throughput. In this method, a small amount of organic solvent was used for the extraction process, which produced little waste. The limits of detection for lower molecular weight (< 230) PAHs range from 0.13 to 0.36 mg kg-1, and for higher molecular weight (> 250) PAHs are estimated to be between 0.5 and 1.0 mg kg-1, with RSD values generally under 20%. Due to the small volumes of organic solvent used, the consumable cost per extraction is only US$ 0.12. This is the first report of the application of SME to solid samples, and the first report of the use of SME for the analysis of PAHs. 相似文献
99.
本文利用30年的气候资料分析了乌鲁木齐冬季光气候与大气混浊度之间的关系,指出了大气混浊度的增加是造成辐射总照度下降的主要原因. 相似文献
100.
本文对某铀矿职业工人和非职业工人头发中的总β、总α放射性水平和铀、钍含量进行了分析测定.结果表明,该矿工人体内铀和钍的蓄积量均在正常放射性本底水平范围内,从头发中检验未观察到工人体内铀、钍放射性水平有明显的升高. 相似文献