全文获取类型
收费全文 | 1823篇 |
免费 | 18篇 |
国内免费 | 23篇 |
专业分类
安全科学 | 48篇 |
废物处理 | 62篇 |
环保管理 | 249篇 |
综合类 | 410篇 |
基础理论 | 350篇 |
环境理论 | 1篇 |
污染及防治 | 524篇 |
评价与监测 | 95篇 |
社会与环境 | 111篇 |
灾害及防治 | 14篇 |
出版年
2023年 | 18篇 |
2022年 | 16篇 |
2021年 | 31篇 |
2020年 | 22篇 |
2019年 | 26篇 |
2018年 | 48篇 |
2017年 | 52篇 |
2016年 | 60篇 |
2015年 | 73篇 |
2014年 | 78篇 |
2013年 | 85篇 |
2012年 | 84篇 |
2011年 | 116篇 |
2010年 | 102篇 |
2009年 | 99篇 |
2008年 | 95篇 |
2007年 | 102篇 |
2006年 | 81篇 |
2005年 | 57篇 |
2004年 | 81篇 |
2003年 | 47篇 |
2002年 | 62篇 |
2001年 | 67篇 |
2000年 | 30篇 |
1999年 | 17篇 |
1998年 | 17篇 |
1997年 | 25篇 |
1996年 | 19篇 |
1995年 | 31篇 |
1994年 | 19篇 |
1993年 | 6篇 |
1992年 | 14篇 |
1991年 | 24篇 |
1990年 | 11篇 |
1989年 | 18篇 |
1988年 | 7篇 |
1987年 | 4篇 |
1985年 | 5篇 |
1984年 | 5篇 |
1982年 | 10篇 |
1981年 | 10篇 |
1979年 | 9篇 |
1970年 | 6篇 |
1969年 | 4篇 |
1966年 | 3篇 |
1965年 | 4篇 |
1962年 | 3篇 |
1960年 | 4篇 |
1959年 | 3篇 |
1954年 | 3篇 |
排序方式: 共有1864条查询结果,搜索用时 31 毫秒
81.
82.
83.
84.
Fenna A. R. Jansen Sheila M. P. Everwijn Robert Scheepjens Theo Stijnen Cacha M. P. C. D. Peeters-Scholte Jan M. M. van Lith Monique C. Haak 《黑龙江环境通报》2016,36(7):601-613
Congenital heart defects (CHDs) are associated with neurodevelopmental (ND) delay. This study aims to assess evidence for impaired prenatal brain development, in fetuses with CHD. A systematical search was performed, and 34 studies evaluating the fetal brain [magnetic resonance imaging (MRI) or ultrasound] in isolated CHD were included (1990–2015). Data regarding cerebral abnormalities, head circumference growth and middle cerebral artery flow were extracted. Prenatal MRI was studied in ten articles (445 fetuses), resulting in a pooled prevalence of 18% (95%CI −6%; 42%) for combined structural and acquired cerebral abnormalities. Prenatal head circumference was studied in 13 articles (753 fetuses), resulting in a pooled z-score of −0.51 (95%CI −0.84; −0.18). Doppler was studied in 21 articles (1412 fetuses), resulting in a lower middle cerebral artery pulsatility index (z-score −0.70 95%CI −0.99; −0.41) in left-sided CHD only. We conclude that prenatal MRI and ultrasound demonstrate brain abnormalities, delay in head growth and brainsparing in subgroups of CHD. However, large MRI studies are scarce, and ultrasound data are biased towards severe and left-sided CHD. Long-term follow-up studies correlating prenatal findings with postnatal ND outcome are limited, and data are lacking to support counseling families regarding ND outcome based on prenatal findings suggestive of altered brain development. © 2016 John Wiley & Sons, Ltd. 相似文献
85.
Rachèl V. van Schendel G. C. Page-Christiaens Lean Beulen Catia M. Bilardo Marjon A. de Boer Audrey B. C. Coumans Brigitte H. Faas Irene M. van Langen Klaske D. Lichtenbelt Merel C. van Maarle Merryn V. E. Macville Dick Oepkes Eva Pajkrt Lidewij Henneman for the Dutch NIPT Consortium 《黑龙江环境通报》2016,36(12):1091-1098
86.
Frederik Banch Clausen 《黑龙江环境通报》2014,34(5):409-415
Incompatibility of red blood cell blood group antigens between a pregnant woman and her fetus can cause maternal immunization and, consequently, hemolytic disease of the fetus and newborn. Noninvasive prenatal testing of cell-free fetal DNA can be used to assess the risk of hemolytic disease of the fetus and newborn to fetuses of immunized women. Prediction of the fetal RhD type has been very successful and is now integrated into clinical practice to assist in the management of the pregnancies of RhD immunized women. In addition, noninvasive prediction of the fetal RhD type can be applied to guide targeted prenatal prophylaxis, thus avoiding unnecessary exposure to anti-D in pregnant women. The analytical aspect of noninvasive fetal RHD typing is very robust and accurate, and its routine utilization has demonstrated high sensitivities for fetal RHD detection. A high compliance with administering anti-D is essential for obtaining a clinical effect. Noninvasive fetal typing of RHC/c, RHE/e, and KEL may become more widely used in the future. © 2014 John Wiley & Sons, Ltd. 相似文献
87.
88.
89.
90.
Sung Kim Chen Zhao Allan T. Bombard Charles Cantor Dirk van den Boom Cosmin Deciu 《黑龙江环境通报》2013,33(13):1310-1313