全文获取类型
收费全文 | 3219篇 |
免费 | 39篇 |
国内免费 | 102篇 |
专业分类
安全科学 | 157篇 |
废物处理 | 271篇 |
环保管理 | 479篇 |
综合类 | 384篇 |
基础理论 | 612篇 |
环境理论 | 1篇 |
污染及防治 | 1046篇 |
评价与监测 | 280篇 |
社会与环境 | 108篇 |
灾害及防治 | 22篇 |
出版年
2023年 | 25篇 |
2022年 | 44篇 |
2021年 | 51篇 |
2020年 | 27篇 |
2019年 | 62篇 |
2018年 | 91篇 |
2017年 | 84篇 |
2016年 | 98篇 |
2015年 | 78篇 |
2014年 | 98篇 |
2013年 | 329篇 |
2012年 | 173篇 |
2011年 | 195篇 |
2010年 | 125篇 |
2009年 | 172篇 |
2008年 | 180篇 |
2007年 | 201篇 |
2006年 | 165篇 |
2005年 | 148篇 |
2004年 | 136篇 |
2003年 | 127篇 |
2002年 | 117篇 |
2001年 | 76篇 |
2000年 | 48篇 |
1999年 | 35篇 |
1998年 | 34篇 |
1997年 | 34篇 |
1996年 | 25篇 |
1995年 | 24篇 |
1994年 | 32篇 |
1993年 | 31篇 |
1992年 | 18篇 |
1991年 | 25篇 |
1990年 | 16篇 |
1989年 | 14篇 |
1988年 | 11篇 |
1987年 | 11篇 |
1986年 | 15篇 |
1985年 | 16篇 |
1984年 | 12篇 |
1983年 | 11篇 |
1982年 | 18篇 |
1981年 | 16篇 |
1980年 | 13篇 |
1979年 | 9篇 |
1978年 | 11篇 |
1976年 | 9篇 |
1973年 | 7篇 |
1972年 | 7篇 |
1971年 | 8篇 |
排序方式: 共有3360条查询结果,搜索用时 15 毫秒
1.
Poudel Jeeban Lee You Min Kim Hyeok Jin Oh Sea Cheon 《Journal of Material Cycles and Waste Management》2021,23(1):214-221
Journal of Material Cycles and Waste Management - Owing to various advantages of artificial marble compared to natural marble, its application has been rising exponentially, which has resulted in... 相似文献
2.
3.
4.
5.
6.
7.
Frank Eierdanz Joseph Alcamo Lilibeth Acosta-Michlik Dörthe Krömker Dennis Tänzler 《Regional Environmental Change》2008,8(4):197-205
This paper presents the technical aspects of a new methodology for assessing the susceptibility of society to drought. The
methodology consists of a combination of inference modelling and fuzzy logic applications. Four steps are followed: (1) model
input variables are selected—these variables reflect the main factors influencing susceptibility in a social group, population
or region, (2) fuzzification—the uncertainties of the input variables are made explicit by representing them as ‘fuzzy membership
functions’, (3) inference modelling—the input variables are used to construct a model made up of linguistic rules, and (4)
defuzzification—results from the model in linguistic form are translated into numerical form, also through the use of fuzzy
membership functions. The disadvantages and advantages of this methodology became apparent when it was applied to the assessment
of susceptibility from three disciplinary perspectives: Disadvantages include the difficulty in validating results and the
subjectivity involved with specifying fuzzy membership functions and the rules of the inference model. Advantages of the methodology
are its transparency, because all model assumptions have to be made explicit in the form of inference rules; its flexibility,
in that informal and expert knowledge can be incorporated through ‘fuzzy membership functions’ and through the rules in the
inference model; and its versatility, since numerical data can be converted to linguistic statements and vice versa through
the procedures of ‘fuzzification’ and ‘defuzzification’. 相似文献
8.
Chih-Ping Chen Schu-Rern Chern Wayseen Wang Chen-Chi Lee Wen-Lin Chen Li-Feng Chen Tung-Yao Chang Chin-Yuan Tzen 《黑龙江环境通报》2001,21(5):346-350
A prenatal diagnosis of partial monosomy 18p(18p11.2→pter) and trisomy 21q(21q22.3→qter) in a fetus with alobar holoprosencephaly (HPE) and premaxillary agenesis (PMA) but without the classical Down syndrome phenotype is reported. A 27-year-old primigravida woman was referred for genetic counselling at 21 weeks' gestation due to sonographic findings of craniofacial abnormalities. Level II ultrasonograms manifested alobar HPE and median orofacial cleft. Cytogenetic analysis and fluorescence in situ hybridization (FISH) on cells obtained from amniocentesis revealed partial monosomy 18p and a cryptic duplication of 21q,46,XY,der(18)t(18;21)(p11.2;q22.3), resulting from a maternal t(18;21) reciprocal translocation. The breakpoints were ascertained by molecular genetic analysis. The pregnancy was terminated. Autopsy showed alobar HPE with PMA, pituitary dysplasia, clinodactyly and classical 18p deletion phenotype but without the presence of major typical phenotypic features of Down syndrome. The phenotype of this antenatally diagnosed case is compared with those observed in six previously reported cases with monosomy 18p due to 18;21 translocation. The present study is the first report of concomitant deletion of HPE critical region of chromosome 18p11.3 and cryptic duplication of a small segment of distal chromosome 21q22.3 outside Down syndrome critical region. The present study shows that cytogenetic analyses are important in detecting chromosomal aberrations in pregnancies with prenatally detected craniofacial abnormalities, and adjunctive molecular investigations are useful in elucidating the genetic pathogenesis of dysmorphism. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
9.
10.
P Joseph S Viswanatha M K Krishnakumari 《Journal of environmental science and health. Part. B》1992,27(3):269-280
The haematotoxicity of technical hexachlorocyclohexane (HCH) (1000 ppm) was investigated in male albino rats fed with diet free of vitamin A or containing vitamin A at 2000 or 10(5) I.U./kg. Assessment of HCH-induced haematotoxicity at the end of the 7 weeks feeding period was done on the basis of haemoglobin content, total count of red blood cells and white blood cells and the differential counts of the white blood cells as well as by parameters such as packed cell volume, mean corpuscular volume, mean corpuscular haemoglobin, mean corpuscular haemoglobin content, prothrombin time and clotting time. In the rats fed with vitamin A-free diet containing HCH, significant reductions were noticed in the total white blood cells count, clotting time and prothrombin time indicating severe haematotoxicity. Differential count of the white blood cells of these rats revealed a non-significant reduction in the lymphocyte count. The only indication of haematotoxicity caused by hexachlorocyclohexane in the vitamin A supplemented rats was a slight but statistically significant reduction of the total count of white blood cells. These results demonstrate that the haematotoxicity of hexachlorocyclohexane in the rats is enhanced by vitamin A-deficiency and its supplementation particularly in excess but not at hypervitaminotic level is protective against the toxicity. 相似文献