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   1378188篇
  免费   96691篇
  国内免费   3079篇
耳鼻咽喉   20180篇
儿科学   41277篇
妇产科学   39376篇
基础医学   192691篇
口腔科学   40935篇
临床医学   116688篇
内科学   270834篇
皮肤病学   30826篇
神经病学   110498篇
特种医学   55825篇
外国民族医学   437篇
外科学   214360篇
综合类   31566篇
现状与发展   6篇
一般理论   474篇
预防医学   95564篇
眼科学   32397篇
药学   102623篇
  4篇
中国医学   3049篇
肿瘤学   78348篇
  2018年   12578篇
  2016年   11361篇
  2015年   12772篇
  2014年   17949篇
  2013年   27034篇
  2012年   35662篇
  2011年   37725篇
  2010年   22355篇
  2009年   21717篇
  2008年   36247篇
  2007年   39387篇
  2006年   39922篇
  2005年   38641篇
  2004年   37556篇
  2003年   36457篇
  2002年   35913篇
  2001年   64128篇
  2000年   65774篇
  1999年   55898篇
  1998年   15165篇
  1997年   13866篇
  1996年   13295篇
  1995年   12575篇
  1994年   11738篇
  1992年   43055篇
  1991年   41553篇
  1990年   40795篇
  1989年   39812篇
  1988年   37192篇
  1987年   36645篇
  1986年   35111篇
  1985年   33340篇
  1984年   25070篇
  1983年   21286篇
  1982年   12931篇
  1981年   11813篇
  1979年   24105篇
  1978年   17260篇
  1977年   14989篇
  1976年   13525篇
  1975年   15422篇
  1974年   18229篇
  1973年   17682篇
  1972年   16932篇
  1971年   15799篇
  1970年   14996篇
  1969年   14424篇
  1968年   13518篇
  1967年   12065篇
  1966年   11316篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
There are an estimated 56 million orphans and vulnerable children across sub-Saharan Africa. Communities typically care for orphan children through informal caring arrangements – either within or outside of kinship networks. Within Kenya, an estimated 250,000 children live on the streets. There is less research related to fostering attitudes of this special population than orphans and vulnerable children generally. Important research over the past decade has illuminated multiple ways in which children are made more vulnerable because of HIV, including parental death and street-migration from HIV-affected households. As HIV transitions from a terminal illness to a chronic, manageable one, research is also required to establish how parents living with HIV can be an asset to children. In this study, we assess whether mothers living with HIV were very willing to foster biologically-related children, and street-involved children, how these fostering attitudes differed from mothers not living with HIV, and whether differences in fostering attitudes by reported HIV status were mediated by social support, family functioning and general self-rated health. Approximately 40% of mothers living with HIV were very willing to provide long-term foster care to biologically-related or street-involved children. This was less than the percentage of mothers not living with HIV, who were very willing to foster biologically-related children (61%) or street-involved children (58%). Significant portions of these differences were explained by social support, family functioning and general self-rated health. Multi-sectoral approaches are suggested by these findings in order to improve the child-fostering capacity of mothers living with HIV. Improving social support, family functioning and general self-rated health among HIV-infected mothers may not only provide protective benefits for the mothers and their children, but also expand the community’s capacity to care for orphan and vulnerable children.  相似文献   
23.
24.
25.
26.
27.
28.
29.
30.
Objectives: The steeling effect suggests that early-life adversity can have a beneficial impact later in life. However, little is known about its underlying mechanisms and long-term outcomes . The study aimed to examine the role of early-life adversity (ELA) on successful aging, and whether this relationship can be explained by mental and physical health.

Method: Socio-demographics, early-life adversity (ELA), individual quality of life (iQoL), and mental and physical health of 270 individuals (Mage = 66.82 years, 71.5% female) were assessed. Polynomial regressions and mediation analyses were conducted.

Results: Significant inverse U-shaped associations were found between ELA and iQoL (β = ?.59, p = .005) and between ELA and mental health (β = ?.64, p = .002), but not between ELA and physical health. Furthermore, mental health significantly mediated the relationship between ELA and iQoL (b = ?.84, BCa CI [?1.66, ?.27]).

Conclusion: Highest level of individual quality of life (i.e. successful aging) was related to a moderate amount of ELA. Additionally, mental health significantly mediated this relationship. These findings suggest that some amount of ELA could be beneficial for successful aging. Resource-focused interventions are needed to improve health and promote successful aging for an underdetected, at-risk subgroup with low early-life adversity.  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