全文获取类型
收费全文 | 597篇 |
免费 | 4篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 45篇 |
废物处理 | 28篇 |
环保管理 | 14篇 |
综合类 | 62篇 |
基础理论 | 79篇 |
环境理论 | 1篇 |
污染及防治 | 254篇 |
评价与监测 | 88篇 |
社会与环境 | 32篇 |
灾害及防治 | 1篇 |
出版年
2024年 | 1篇 |
2023年 | 12篇 |
2022年 | 14篇 |
2021年 | 31篇 |
2020年 | 13篇 |
2019年 | 30篇 |
2018年 | 30篇 |
2017年 | 36篇 |
2016年 | 55篇 |
2015年 | 11篇 |
2014年 | 43篇 |
2013年 | 104篇 |
2012年 | 26篇 |
2011年 | 33篇 |
2010年 | 16篇 |
2009年 | 16篇 |
2008年 | 24篇 |
2007年 | 23篇 |
2006年 | 12篇 |
2005年 | 13篇 |
2004年 | 12篇 |
2003年 | 14篇 |
2002年 | 9篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1997年 | 2篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1993年 | 2篇 |
1985年 | 2篇 |
1982年 | 1篇 |
1973年 | 1篇 |
1965年 | 1篇 |
1963年 | 1篇 |
1962年 | 2篇 |
1961年 | 3篇 |
1938年 | 1篇 |
排序方式: 共有604条查询结果,搜索用时 31 毫秒
601.
Alireza A. Shamshirsaz Ramen H. Chmait Julien Stirnemann Mounira A. Habli Anthony Johnson Kamran Hessami Shayan Mostafaei Ahmed A. Nassr Roopali V. Donepudi Magdalena Sanz Cortes Jimmy Espinoza Eyal Krispin Michael A. Belfort 《黑龙江环境通报》2023,43(1):72-83
This meta-analysis aims to compare the perinatal outcome of twin-twin transfusion syndrome (TTTS) pregnancies undergoing selective versus vascular equator (Solomon) fetoscopic laser photocoagulation (FLP). We performed a systematic search in PubMed and Web of Science from inception up to 25 July 2021. Studies comparing the Solomon and selective techniques of FLP for treatment of TTTS pregnancies were eligible. Random-effects or fixed-effect models were used to pool standardized mean differences (SMD) and log odds ratio. Seven studies with a total of 1664 TTTS pregnancies (n = 671 undergoing Solomon and n = 993 selective techniques) were included. As compared to the selective FLP, Solomon was associated with a lower risk of recurrent TTTS compared to the selective technique (Log odds ratio [OR]: −1.167; 95% credible interval [CrI]: −2.01, −0.33; p = 0.021; I2: 67%). In addition, Solomon was significantly associated with a higher risk of placental abruption than the selective technique (Log [OR]: 1.44; 95% CrI: 0.45, 2.47; p = 0.012; I2: 0.0%). Furthermore, a trend for the higher risk of preterm premature rupture of membranes was observed among those undergoing Solomon (Log [OR]: 0.581; 95% CrI: −0.43, 1.49; p = 0.131; I2: 17%). As compared to selective FLP, the Solomon technique for TTTS pregnancies is associated with a significantly lower recurrence of TTTS; however, it significantly increases the risk of placental abruption. 相似文献
602.
603.
William J. Smith Claudio S. Quilodrán Michał T. Jezierski Ashley T. Sendell-Price Sonya M. Clegg 《Conservation biology》2022,36(3):e13867
Domestic animals have immense economic, cultural, and practical value and have played pivotal roles in the development of human civilization. Many domesticates have, among their wild relatives, undomesticated forms representative of their ancestors. Resurgent interest in these ancestral forms has highlighted the unclear genetic status of many, and some are threatened with extinction by hybridization with domestic conspecifics. We considered the contemporary status of these ancestral forms relative to their scientific, practical, and ecological importance; the varied impacts of wild–domestic hybridization; and the challenges and potential resolutions involved in conservation efforts. Identifying and conserving ancestral forms, particularly with respect to disentangling patterns of gene flow from domesticates, is complex because of the lack of available genomic and phenotypic baselines. Comparative behavioral, ecological, and genetic studies of ancestral-type, feral, and domestic animals should be prioritized to establish the contemporary status of the former. Such baseline information will be fundamental in ensuring successful conservation efforts. 相似文献
604.
Przydatek Grzegorz Budzik Grzegorz Janik Małgorzata 《Environmental science and pollution research international》2022,29(21):31467-31475
Environmental Science and Pollution Research - This paper discusses interactions between the generation, collection and recovery of used tyres while considering an indicator of their mass... 相似文献