全文获取类型
收费全文 | 428篇 |
免费 | 8篇 |
国内免费 | 9篇 |
专业分类
安全科学 | 13篇 |
废物处理 | 14篇 |
环保管理 | 61篇 |
综合类 | 85篇 |
基础理论 | 82篇 |
污染及防治 | 124篇 |
评价与监测 | 28篇 |
社会与环境 | 24篇 |
灾害及防治 | 14篇 |
出版年
2023年 | 8篇 |
2022年 | 11篇 |
2021年 | 22篇 |
2020年 | 16篇 |
2019年 | 8篇 |
2018年 | 18篇 |
2017年 | 20篇 |
2016年 | 36篇 |
2015年 | 21篇 |
2014年 | 28篇 |
2013年 | 40篇 |
2012年 | 26篇 |
2011年 | 29篇 |
2010年 | 16篇 |
2009年 | 20篇 |
2008年 | 21篇 |
2007年 | 20篇 |
2006年 | 13篇 |
2005年 | 7篇 |
2004年 | 12篇 |
2003年 | 13篇 |
2002年 | 14篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1998年 | 2篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1982年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有445条查询结果,搜索用时 546 毫秒
441.
442.
443.
Geographical and pedological drivers of distribution and risks to soil fauna of seven metals (Cd, Cu, Cr, Ni, Pb, V and Zn) in British soils 总被引:1,自引:0,他引:1
Spurgeon DJ Rowland P Ainsworth G Rothery P Long S Black HI 《Environmental pollution (Barking, Essex : 1987)》2008,153(2):273-283
Concentrations of seven metals were measured in over 1000 samples as part of an integrated survey. Sixteen metal pairs were significantly positively correlated. Cluster analysis identified two clusters. Metals from the largest (Cr, Cu, Ni, V, Zn), but not the smallest (Cd, Pb) cluster were significantly negatively correlated with spatial location and soil pH and organic matter content. Cd and Pb were not correlated with these parameters, due possibly to the masking effect of recent extensive release. Analysis of trends with soil properties in different habitats indicated that general trends may not necessarily be applicable to all areas. A risk assessment indicated that Zn poses the most widespread direct risk to soil fauna and Cd the least. Any risks associated with high metal concentrations are, however, likely to be greatest in habitats such as arable and horticultural, improved grassland and built up areas where soil metal concentrations are more frequently elevated. 相似文献
444.
Isabella Fabietti Giulia Grassini Sara Savelli Roberta Vicario Anita Romiti Milena Viggiano Chiara Vassallo Laura Valfrè Paola Giliberti Irma Capolupo Marco Bonito Pietro Bagolan Francesco Morini Leonardo Caforio 《黑龙江环境通报》2023,43(8):1002-1007
Objective
To evaluate fetal brain development using MRI (magnetic resonance imaging) in CDH (congenital diaphragmatic hernia).Methods
52 isolated left CDH and 104 control fetuses were imaged using MRI. Brain morphometry (Biparietal diameter—BPD, brain fronto-occipital diameter—BFOD, third ventricle, posterior ventricles, transcerebellar diameter—TCD, anteroposterior and craniocaudal cerebellar vermis diameter—AP and CC) and cortical structures (bilateral cingulate fissure—CF, insular fissure—IF, insular depth - ID) were compared with controls using Mann–Whitney test.Results
Median gestational age at MRI (p = 0.95)and the median biparietal diameter (p = 0.737) were comparable. Among morphometric parameters, only the brain fronto-occipital diameter was significantly smaller in CDH (p = 0.001) and the third ventricle was significantly greater in CDH (<0.0001). Among cortical structures, the cingulate and insular fissures were significantly deeper in CDH fetuses (p < 0.0001) as the insular depth ID was smaller in CDH (p < 0.03).Conclusions
CDH fetuses have a smaller fronto-occipital diameter, reduced insular depth, deeper cingulate and insular fissure, and greater third ventricle width as compared to controls. These findings suggest that left CDH may have an impact on fetal brain development with an overall reduction in brain volume. 相似文献445.
Hashempour Motlagh Shirazi Sara Khalili Davar Zand-Parsa Shahrokh Shirvani Amin 《Environment, Development and Sustainability》2022,24(9):11348-11368
Environment, Development and Sustainability - Spatio-temporal variability of extreme precipitation characteristics (EPCs) were analyzed using clustering techniques to establish homogeneous... 相似文献