首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   689篇
  免费   14篇
  国内免费   9篇
安全科学   66篇
废物处理   32篇
环保管理   99篇
综合类   126篇
基础理论   157篇
污染及防治   140篇
评价与监测   42篇
社会与环境   43篇
灾害及防治   7篇
  2023年   5篇
  2022年   3篇
  2021年   13篇
  2020年   14篇
  2019年   7篇
  2018年   16篇
  2017年   33篇
  2016年   27篇
  2015年   28篇
  2014年   30篇
  2013年   51篇
  2012年   30篇
  2011年   56篇
  2010年   27篇
  2009年   37篇
  2008年   42篇
  2007年   54篇
  2006年   25篇
  2005年   30篇
  2004年   26篇
  2003年   29篇
  2002年   20篇
  2001年   15篇
  2000年   10篇
  1999年   10篇
  1998年   6篇
  1997年   6篇
  1996年   5篇
  1995年   7篇
  1994年   11篇
  1993年   6篇
  1992年   2篇
  1991年   1篇
  1990年   4篇
  1989年   3篇
  1988年   2篇
  1987年   3篇
  1986年   1篇
  1985年   1篇
  1984年   5篇
  1983年   3篇
  1982年   1篇
  1981年   2篇
  1975年   1篇
  1974年   1篇
  1973年   1篇
  1968年   1篇
  1958年   1篇
排序方式: 共有712条查询结果,搜索用时 46 毫秒
711.
Chloroform, a probable human carcinogen, is mainly produced anthropogenically for industrial use and may be released to the environment from a large number of sources related to its manufacture and use, including pulp and paper mills, hazardous waste sites, and sanitary landfills. Remediation of chloroform through conventional technologies has been met with limited success due to the conditions required and the formation of hazardous substances such as dichloromethane. The objective of this study was to investigate chloroform reduction in multicontaminated fine-textured soil using zero-valent iron (Fe0) in anaerobic microcosms. Four amended matrices were tested: simple matrix control (glass beads), soil matrix control (glass beads + soil), Fe0 in a simple matrix (glass beads + Fe0), and Fe0 in a soil matrix (soil + Fe0). Headspace chloroform and its transformation products dichloromethane, chloromethane, and methane were measured over 230 days and during short intervals in the initial 3 days. Chloroform (~0.3 mM initial mass) persisted in both control microcosms but was completely transformed in microcosms containing soil + Fe0 by 12 h and glass beads + Fe0 by 48 h. Reductive dechlorination of chloroform occurred with simultaneous production of dichloromethane (~0.11 to 0.14 mM mass) and chloromethane (~0.02 to 0.13 mM mass). Little methane (~0.07 to 0.26 μM mass) production as an end product of chloroform reduction was observed in microcosms amended with Fe0. Produced dichloromethane and chloroform almost disappeared by 230 days. The results showed a complete chloroform transformation pathway that has good potential for the remediation of chlorinated compounds in fine-textured soil. The role of soil clay minerals in redox reactions can be further investigated to improve the reductive dechlorination of chlorinated compounds in contaminated environments.  相似文献   
712.

Objective

Ultrasound assessment of the fetal anatomy and fetal echocardiography are feasible in the first trimester of pregnancy. This study was designed to assess the performance of a comprehensive fetal anatomy assessment in a high-risk population at a tertiary fetal medicine unit.

Methods

A retrospective review of high-risk patients undergoing comprehensive fetal anatomy ultrasound assessment between 11 weeks and 13 + 6 weeks of gestation was conducted. Findings of the early anatomy ultrasound scan were compared with those of the second trimester anatomy scan, and birth outcomes or post-mortem results.

Results

Early anatomy ultrasounds were performed in 765 patients. The sensitivity of the scan for detecting fetal anomalies compared to the birth outcome was 80.5% (95% CI 73.5–86.3) and specificity was 93.1% (95%CI 90.6–95.2). Positive and negative predictive values were 78.5% (95% CI 71.4–84.6) and 93.9% (95% CI 91.4–95.8), respectively. The most missed and overdiagnosed abnormalities were ventricular septal defects. The second trimester ultrasound had sensitivity of 69.0% (95% CI 55.5–80.5) and specificity of 87.5% (95% CI 84.3–90.2).

Conclusions

In a high-risk population, early assessments had similar performance metrics as the second trimester anatomy ultrasound. We advocate for a comprehensive fetal assessment in the care of high-risk pregnancies.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号