全文获取类型
收费全文 | 3659篇 |
免费 | 250篇 |
国内免费 | 25篇 |
专业分类
安全科学 | 222篇 |
废物处理 | 190篇 |
环保管理 | 1120篇 |
综合类 | 316篇 |
基础理论 | 1014篇 |
环境理论 | 1篇 |
污染及防治 | 689篇 |
评价与监测 | 191篇 |
社会与环境 | 93篇 |
灾害及防治 | 98篇 |
出版年
2023年 | 16篇 |
2022年 | 21篇 |
2021年 | 35篇 |
2020年 | 31篇 |
2019年 | 68篇 |
2018年 | 105篇 |
2017年 | 81篇 |
2016年 | 124篇 |
2015年 | 108篇 |
2014年 | 114篇 |
2013年 | 538篇 |
2012年 | 148篇 |
2011年 | 185篇 |
2010年 | 167篇 |
2009年 | 156篇 |
2008年 | 195篇 |
2007年 | 176篇 |
2006年 | 165篇 |
2005年 | 122篇 |
2004年 | 101篇 |
2003年 | 129篇 |
2002年 | 121篇 |
2001年 | 84篇 |
2000年 | 72篇 |
1999年 | 36篇 |
1998年 | 47篇 |
1997年 | 33篇 |
1996年 | 40篇 |
1995年 | 49篇 |
1994年 | 40篇 |
1993年 | 46篇 |
1992年 | 39篇 |
1991年 | 24篇 |
1990年 | 28篇 |
1989年 | 20篇 |
1988年 | 30篇 |
1987年 | 21篇 |
1986年 | 24篇 |
1985年 | 33篇 |
1984年 | 25篇 |
1983年 | 30篇 |
1982年 | 38篇 |
1981年 | 36篇 |
1980年 | 34篇 |
1979年 | 23篇 |
1978年 | 24篇 |
1977年 | 11篇 |
1976年 | 9篇 |
1974年 | 10篇 |
1972年 | 10篇 |
排序方式: 共有3934条查询结果,搜索用时 15 毫秒
21.
22.
Santamaría-Fernández R Moreda-Piñeiro A Hill SJ 《Journal of environmental monitoring : JEM》2002,4(2):330-336
The optimisation of a simple multielement extraction method employing an experimental design approach is described. The method uses centrifugation to pass one extractant solution at varying pH through a contaminated soil sample. The nature and concentration of the acid, rate of centrifugation and time, number of sequential leachates and the ratio of extractant volume: sample weight have been studied in order to obtain the optimum conditions for extraction. A fractional factorial experimental design was performed, and the results were used to identify significance which was then evaluated by carrying out a central composite experimental approach. Once optimum conditions had been obtained, sequential leaches were analysed by ICP-AES and chemometrics were employed to identify the composition of each component. Comparisons have been made with previous studies and tentative assignments, based on well defined separated fractions and percentage compositions for individual elements, used to identify the different physico-chemical components in the sample. 相似文献
23.
Ambient Air Quality Monitoring Network Design for Assessing Human Health Impacts from Exposures to Airborne Contaminants 总被引:1,自引:0,他引:1
Existing methods of establishing ambientair quality monitoring networks typically evaluateonly parameters related to ambient concentrations ofthe contaminant(s) of interest such as emissionsource characteristics, atmospheric transport anddispersion, secondary reactions, depositioncharacteristics, and local topography. However,adverse health risks from exposures to airbornecontaminants are a function of the contaminant andthe anatomic and physiologic characteristics of theexposed population. Thus, ambient air qualitymonitoring networks designed for the protection ofpublic health or for epidemiological studiesevaluating adverse health impacts from exposures toambient air contaminants should account for bothcontaminant characteristics and human healthparameters. A methodology has been establishedwhich optimizes ambient air quality monitoringnetworks for assessments of adverse human healthimpacts from exposures to airborne contaminants byincorporating human health risk assessmenttechniques. The use of risk assessment techniquesas the basis for designing ambient air qualitymonitoring networks will help to target limitedfinancial and human resources to evaluate humanhealth risks from exposures to airbornecontaminants. 相似文献
24.
K. G. Willis Malcolm Newson Sonja Boehmer‐Christiansen 《Journal of Environmental Planning and Management》1994,37(2):243-247
Cost Benefit Analysis of Environmental Change
Per‐Olov Johansson
Cambridge, Cambridge University Press, 1993, 232 pp., £13.95
Computerised Environmental Modelling: A Practical Introduction using Excel
J. Hardisty, D. M. Taylor & S. E. Metcalfe
Chichester, Wiley, 1993, 204 pp., £14.95
Keeping Pace with Science and Engineering: Case Studies in Environmental Regulation
Washington DC, US National Academy of Engineering, 1993
World Without End: Economics, Environment and Sustainable Development
D. W. Pearce & J. J. Warford
Oxford University Press, New York, 1993, 440 pp., £35.95 相似文献
25.
26.
Behavioural ecologists attempt to predict fitness in birds from estimates of body condition and immune capacity. We investigated how the stresses associated with capture, confinement and captive-rearing of wild zebra finches (Taeniopygia guttata) affected different elements of the immune system and body condition. Wild birds had higher heterophil:lymphocyte ratios and total leucocyte counts than aviary birds, presumably an outcome of mounting specific resistance to pathogens, but this response diminished significantly within 10 days of confinement. Wild birds had lower phytohaemagglutinin-A (PHA) responses than their aviary-bred counterparts possibly because energetic costs limited a general resistance response. Wild birds were heavier and had higher haematocrits than their aviary counterparts, but had less fat, although just 10 days of captivity significantly increased fat levels. Measures of body condition were of limited use for predicting immune responsiveness. We conclude that the different elements of the immune system and body condition respond independently, and often unpredictably, to many ecological and behavioural stressors. 相似文献
27.
Richard J. Stock M.D. 《黑龙江环境通报》1982,2(2):133-137
A case of fetal death secondary to a needle laceration during a second trimester amniocentesis is presented. The need for careful pathologic evaluation of fetuses lost subsequent to these procedures is stressed. 相似文献
28.
29.
Dr. Lauren Lynch James Bussel James D. Goldberg Usha Chitkara Isabelle Wilkins Jan Macfarland Richard L. Berkowitz 《黑龙江环境通报》1988,8(5):329-331
A case is presented in which percutaneous umbilical sampling (PUBS) was utilized in the second and third trimesters for the diagnosis and management of a pregnancy at risk for neonatal alloimmune thrombocytopenia (NAIT). 相似文献
30.