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   2596142篇
  免费   198646篇
  国内免费   5658篇
耳鼻咽喉   36166篇
儿科学   85119篇
妇产科学   72822篇
基础医学   372724篇
口腔科学   71198篇
临床医学   232357篇
内科学   511766篇
皮肤病学   57161篇
神经病学   213553篇
特种医学   99687篇
外国民族医学   799篇
外科学   392353篇
综合类   56737篇
现状与发展   7篇
一般理论   980篇
预防医学   200583篇
眼科学   59941篇
药学   189247篇
  2篇
中国医学   5436篇
肿瘤学   141808篇
  2019年   21120篇
  2018年   29517篇
  2017年   22262篇
  2016年   25434篇
  2015年   28926篇
  2014年   40539篇
  2013年   60922篇
  2012年   83549篇
  2011年   88954篇
  2010年   52372篇
  2009年   49471篇
  2008年   83581篇
  2007年   89464篇
  2006年   89806篇
  2005年   87789篇
  2004年   84394篇
  2003年   80642篇
  2002年   78588篇
  2001年   115375篇
  2000年   117755篇
  1999年   99488篇
  1998年   30425篇
  1997年   27263篇
  1996年   27019篇
  1995年   25611篇
  1994年   23565篇
  1993年   22099篇
  1992年   77237篇
  1991年   74796篇
  1990年   72761篇
  1989年   70199篇
  1988年   64856篇
  1987年   63531篇
  1986年   60048篇
  1985年   57470篇
  1984年   43837篇
  1983年   37708篇
  1982年   23562篇
  1981年   20958篇
  1979年   39841篇
  1978年   28522篇
  1977年   24103篇
  1976年   22813篇
  1975年   24229篇
  1974年   28753篇
  1973年   27646篇
  1972年   26036篇
  1971年   23882篇
  1970年   22494篇
  1969年   21319篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
The current study explored the influence of three methods of parental emotion discourse (structured story-telling, reminiscing, and picture book) and their relation to preschoolers’ emotion understanding. Thirty-seven families participated in the study. Analyses showed that the structured story-telling method produced more emotion words, was high in unique emotion words, and was high for both emotion labelling and explanations. All three methods showed some potential to predict preschooler’s emotion understanding. Structured story-telling was best at predicting role-taking, while reminiscing and the picture book both were better at predicting situation knowledge. Additional studies are needed to further explore the influence of different methods of assessing emotion discourse to enhance validity and reliability of research in this field.  相似文献   
32.
33.
ABSTRACT

This project examined 55 picture books featuring transgender, gender expansive or genderqueer protagonists or narrators published between 2008 and 2018. The purpose of the study was to determine how this genre of children’s literature supports and challenges four gender assumptions: the gender binary, gender essentialism, sex/gender congruency and gender stability. Additionally, this critical analysis explored misgendering within this genre and themes of social rejection and acceptance. Protagonists and narrators were permitted a degree of gender nonconformity, however, the majority of picture books missed opportunities for a more complete exploration of gender possibilities.  相似文献   
34.
35.
G. Berlin  M. Hammar  L. Tapper 《Platelets》2019,30(4):473-479
Platelets are needed to prevent or arrest bleeding and aggregate at the site of injury upon vascular damage. Platelets express receptors for estrogens which might affect the function of the platelets and their hemostatic ability. The aim was to identify possible differences in platelet function related to age, gender, and phases of the menstrual cycle by use of impedance aggregometry with Multiplate. In the first part of the study, platelet function was assessed in 60 healthy individuals (30 men and 30 women) in each of three age groups (20–25, 40–45, and 60–65 years). In the second part of the study, the platelet function was analyzed on four occasions during the menstrual cycle in women without oral contraceptives (OCs) (n = 17) and compared to 19 women on OCs and 18 men of similar age (20–40 years). For the women on OCs, aggregation was analyzed once during the tablet-free week and once late during the period with OCs. The men were sampled once. Women of younger age (<45 years) had significantly higher agonist-induced aggregation response than both men and post-menopausal women (60–65 years). The agonist-induced aggregation response did not differ between phases of the menstrual cycle or OC use. The results suggest that estradiol and/or progesterone affect spontaneous aggregation since it was found to be lowest in the mid-luteal phase. Spontaneous aggregation was significantly lower in women on OCs than in both men and women without OCs. Our findings indicate that fertile age is associated with higher aggregation response capacity of the platelets, possibly to prevent excessive bleeding during menstruation, but this response capacity is not altered during the menstrual cycle or by use of OCs.  相似文献   
36.
37.
38.
39.
40.
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia.  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