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   18976篇
  免费   1784篇
  国内免费   254篇
耳鼻咽喉   50篇
儿科学   572篇
妇产科学   438篇
基础医学   1762篇
口腔科学   165篇
临床医学   4300篇
内科学   1941篇
皮肤病学   60篇
神经病学   1204篇
特种医学   291篇
外科学   1871篇
综合类   1951篇
一般理论   2篇
预防医学   4432篇
眼科学   29篇
药学   878篇
  13篇
中国医学   226篇
肿瘤学   829篇
  2024年   72篇
  2023年   465篇
  2022年   733篇
  2021年   1038篇
  2020年   1038篇
  2019年   1006篇
  2018年   944篇
  2017年   951篇
  2016年   893篇
  2015年   844篇
  2014年   1405篇
  2013年   1690篇
  2012年   1189篇
  2011年   1183篇
  2010年   963篇
  2009年   873篇
  2008年   918篇
  2007年   857篇
  2006年   678篇
  2005年   536篇
  2004年   438篇
  2003年   357篇
  2002年   299篇
  2001年   230篇
  2000年   216篇
  1999年   185篇
  1998年   137篇
  1997年   148篇
  1996年   89篇
  1995年   99篇
  1994年   95篇
  1993年   74篇
  1992年   59篇
  1991年   43篇
  1990年   35篇
  1989年   35篇
  1988年   30篇
  1987年   32篇
  1986年   19篇
  1985年   23篇
  1984年   24篇
  1983年   19篇
  1982年   13篇
  1981年   5篇
  1980年   7篇
  1979年   8篇
  1978年   6篇
  1976年   4篇
  1975年   3篇
  1973年   2篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
The buffering effect of social support on the negative effects of racism exposure on health outcomes has been mixed in prior studies regarding Asian Americans. Based on the stress-coping framework and using structural equation modelling (SEM) methods, we tested a theoretical model portraying simultaneous mediational paths from racism exposure to general physical and mental health through racism-related stress. Bootstrap analysis was used to test the indirect effects present in the model. Additionally, multi-group SEM analysis was conducted to investigate the moderation effect of social support from family and friends on the paths in the model. The sample consisted of 310 Asian American adults who completed an online survey. The results from the two-step SEM analysis and bootstrap analysis supported the theoretical model—racism exposure can simultaneously have a negative indirect effect on Asian Americans' physical and mental health via racism-related stress. Multi-group SEM analysis showed that there were no differences in model path coefficients based on having varying levels of social support from friends or family.  相似文献   
92.
93.
94.
95.
SettingThis knowledge mobilization project was conceptualized to increase awareness among breastfeeding mothers and the general public on safe infant feeding practices during the COVID-19 pandemic by addressing myths and misconceptions associated with breastfeeding practices, guiding breastfeeding mothers to make informed decisions around child feeding practices, and offering meaningful guidance in simple language through a short online animated video.InterventionThis project was undertaken in four phases. During phase 1, an informal discussion was held with the breastfeeding mothers, service providers, and community partner in identifying issues surrounding lactation counselling facilities during the COVID-19 pandemic. During phase 2, recommendations from 23 organizations with regard to breastfeeding during COVID-19 were reviewed and analyzed. During phase 3, using evidence from reliable sources, a 5-minute animated e-resource on breastfeeding during COVID-19 was conceptualized and developed. During phase 4, the e-resource was disseminated to the breastfeeding mothers, general public, post-secondary institutions, and organizations providing services to breastfeeding mothers in Canada.OutcomesThis evidence-based e-resource facilitated addressing misconceptions around breastfeeding during COVID-19 and raising public awareness on safe infant feeding practices during this pandemic. Overall, the video was described as an informative, user-friendly, useful, and easily accessible resource by breastfeeding mothers who were in self-isolation with little access to healthcare services during the pandemic.ImplicationsThis project highlighted the importance of patient engagement and collaboration with the community partner in protecting breastfeeding during the COVID-19 pandemic. It further illustrated how informational e-resources can protect breastfeeding in situations where breastfeeding mothers’ access to healthcare services is compromised.  相似文献   
96.
ObjectiveTo systematically describe the school nutritional policies of the 17 autonomous communities of Spain.MethodThrough a search of bibliographic databases, web pages and other official information systems, 183 documents of interest were identified. Information was systematically collected with the SNIPE (school nutrition index of programme effectiveness) questionnaire, adapted to Spain, and validated by reference staff of the regional government's health and education ministries.ResultsThe main objective of the policies is to prevent obesity and improve the nutrition of schoolchildren. The 17 autonomous communities cover the school canteen service, 11 cafeteria and vending machines, and 9 the breakfast service. All communities use the Consensus Document on School Food as a reference for the content of the menu and the nutritional quality of the products offered at the school; however, only 4 of them have regulated these aspects. The evaluation of policy objectives ranges from 58.8% of the autonomous communities for food supply to 5.9% for rotation and menu quality.ConclusionAlthough all the autonomous communities have standards for the school menu, the standards for the rest of the food supply vary across them; also, evaluation of objectives is scarce and only 4 communities have approved mandatory regulations. Nutritional standards should be reviewed according to current scientific knowledge and enacted by law, in compliance with the current legislation (Act 17/2011).  相似文献   
97.
98.
99.
100.
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