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   45006篇
  免费   7849篇
  国内免费   167篇
耳鼻咽喉   896篇
儿科学   1477篇
妇产科学   1261篇
基础医学   3595篇
口腔科学   3322篇
临床医学   7016篇
内科学   9222篇
皮肤病学   807篇
神经病学   4027篇
特种医学   1764篇
外国民族医学   1篇
外科学   7647篇
综合类   538篇
现状与发展   12篇
一般理论   13篇
预防医学   5036篇
眼科学   925篇
药学   1512篇
中国医学   12篇
肿瘤学   3939篇
  2023年   1169篇
  2022年   489篇
  2021年   989篇
  2020年   1426篇
  2019年   842篇
  2018年   1798篇
  2017年   1615篇
  2016年   1809篇
  2015年   1937篇
  2014年   2590篇
  2013年   3249篇
  2012年   2016篇
  2011年   2043篇
  2010年   2118篇
  2009年   2593篇
  2008年   1860篇
  2007年   1724篇
  2006年   1833篇
  2005年   1709篇
  2004年   1476篇
  2003年   1366篇
  2002年   1239篇
  2001年   936篇
  2000年   833篇
  1999年   891篇
  1998年   793篇
  1997年   693篇
  1996年   753篇
  1995年   580篇
  1994年   506篇
  1993年   450篇
  1992年   641篇
  1991年   551篇
  1990年   507篇
  1989年   499篇
  1988年   477篇
  1987年   435篇
  1986年   430篇
  1985年   419篇
  1984年   329篇
  1983年   351篇
  1982年   276篇
  1981年   276篇
  1980年   228篇
  1979年   310篇
  1978年   245篇
  1977年   215篇
  1976年   191篇
  1974年   223篇
  1973年   227篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
The association between asbestos exposure, mainly in occupational settings, and malignant mesothelioma has been well established; this has prompted several countries to establish mesothelioma epidemiologic surveillance programs often at the request of national agencies. This review compares currently existing mesothelioma registries worldwide to develop a concept model for a US real-time case capture mesothelioma registry. Five countries were identified with a mesothelioma specific registry, including Italy, France, UK, Australia, and South Korea. All, except the UK, used interviews to collect exposure data. Linkage with the national death index was available or was in future plans for all registries. The registries have limited information on treatment, quality of life, and other patient-centered outcomes such as symptoms and pain management. To thoroughly collect exposure data, “real-time” enrollment is preferable; to maximize the capture of mesothelioma cases, optimal coverage, and a simplified consent process are needed.  相似文献   
4.
5.
6.
7.
ABSTRACT

A qualitative grounded theory approach was used to analyze 34 narratives from young men about their experience of retaining, losing, or giving away their virginity, where 7 said they were virgins, 26 said they were non-virgins, and one did not mention his virginity status. We found that virginity is a multidimensional concept, with two distinct dimensions: the experiential and the developmental. The experiential dimension refers to young men's perception and understanding of their virginity in four overlapping areas: physical, spiritual, relational, and emotional. The developmental dimension refers to young men's perception of their underlying sexual identity growth processes and the gendered and sexual double standards that influence this understanding. Clinical implications of this study are useful in education and counseling. They seek to empower young men with information relating to the multidimensional nature of virginity experience, and minimize the negative effects on romantic relationships, sexual adjustment, and self-identity development. The findings are helpful in designing interventions for young men and women who are at high risk for sexually transmitted infections and can help them negotiate mutually safe and pleasurable experiences regarding their virginity.  相似文献   
8.
9.
10.
Neuroimaging studies using the social-exclusion paradigm Cyberball indicate increased dorsal anterior cingulate cortex (dACC) and right insula activity as a function of exclusion. However, comparatively less work has been done on how social status factors may moderate this finding. This study used the Cyberball paradigm with 85 (45 females) socio-economically diverse participants from a larger longitudinal sample. We tested whether neighborhood quality during adolescence would predict subsequent neural responding to social exclusion in young adulthood. Given previous behavioral studies indicating greater social vigilance and negative evaluation as a function of lower status, we expected that lower adolescent neighborhood quality would predict greater dACC activity during exclusion at young adulthood. Our findings indicate that young adults who lived in low-quality neighborhoods in adolescence showed greater dACC activity to social exclusion than those who lived in higher quality neighborhoods. Lower neighborhood quality also predicted greater prefrontal activation in the superior frontal gyrus, dorsal medial prefrontal cortex and the middle frontal gyrus, possibly indicating greater regulatory effort. Finally, this effect was not driven by subsequent ratings of distress during exclusion. In sum, adolescent neighborhood quality appears to potentiate neural responses to social exclusion in young adulthood, effects that are independent of felt distress.  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