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   146882篇
  免费   31895篇
  国内免费   1159篇
耳鼻咽喉   2849篇
儿科学   4684篇
妇产科学   3667篇
基础医学   8788篇
口腔科学   5479篇
临床医学   33522篇
内科学   32594篇
皮肤病学   3946篇
神经病学   16879篇
特种医学   4407篇
外科学   21682篇
综合类   684篇
现状与发展   40篇
一般理论   109篇
预防医学   20348篇
眼科学   2791篇
药学   4404篇
中国医学   66篇
肿瘤学   12997篇
  2024年   753篇
  2023年   5207篇
  2022年   1453篇
  2021年   3566篇
  2020年   5819篇
  2019年   2901篇
  2018年   7824篇
  2017年   8068篇
  2016年   8714篇
  2015年   8924篇
  2014年   11763篇
  2013年   14318篇
  2012年   7240篇
  2011年   7293篇
  2010年   8782篇
  2009年   10852篇
  2008年   6916篇
  2007年   6112篇
  2006年   7121篇
  2005年   5858篇
  2004年   5070篇
  2003年   4542篇
  2002年   4195篇
  2001年   2220篇
  2000年   1435篇
  1999年   2082篇
  1998年   2692篇
  1997年   2446篇
  1996年   2361篇
  1995年   2113篇
  1994年   1465篇
  1993年   1212篇
  1992年   956篇
  1991年   816篇
  1990年   667篇
  1989年   691篇
  1988年   668篇
  1987年   532篇
  1986年   500篇
  1985年   443篇
  1984年   428篇
  1983年   456篇
  1982年   433篇
  1981年   395篇
  1980年   270篇
  1979年   152篇
  1978年   231篇
  1977年   166篇
  1976年   140篇
  1974年   138篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
The present study demonstrates that alcohol-induced memory impairment can be attenuated by pretreatment with an oral tryptophan supplementation. These results provide support for the role of a brain serotonin deficit in this impairment and highlight the impact a dietary manipulation can have on a complex behavioral process.  相似文献   
24.
25.
26.
The definition of envy is commonly based on psychoanalytical views of organizational culture. The purpose of this paper is to describe envy in a nursing community. The population study consisted of random sample of 120 subjects drawn from among the employees of one central hospital in Finland. The study material consisted of data collected by questionnaires (response rate 65%). The data were processed by various statistical methods. Open-ended questions were analysed by inductive content analysis. The results of this study indicated that the employee's view of his/her official position in the nursing community, his/her relationships with his/her fellow workers and the management as well as relationships with other nursing communities are all related to envy. The employee's view of his/her official position intensified his/her feelings of envy, if he/she had other negative feelings, anxiety, dissatisfaction with him/herself, and negative feelings towards fellow workers. The major object of envy was fellow workers' salaries. Envy towards other nursing communities was generated by alleged differences in the amount of labour, or by the charge nurse's greater interest in other sections. Employees coped with envy by hiding these feelings and being modest. Women coped with envy by being silent, while men denied the value of the object of envy.  相似文献   
27.
28.
Psychological Consequences of Food Restriction   总被引:1,自引:0,他引:1  
A review of the literature and research on food restriction indicates that inhibiting food intake has consequences that may not have been anticipated by those attempting such restriction. Starvation and self-imposed dieting appear to result in eating binges once food is available and in psychological manifestations such as preoccupation with food and eating, increased emotional responsiveness and dysphoria, and distractibility. Caution is thus advisable in counseling clients to restrict their eating and diet to lose weight, as the negative sequelae may outweigh the benefits of restraining one's eating. Instead, healthful, balanced eating without specific food restrictions should be recommended as a long-term strategy to avoid the perils of restrictive dieting. J Am Diet Assoc. 1996; 96:589-592.  相似文献   
29.
Summary: This is the first report of the largest study of blood pressure measurement in pregnancy in a New Zealand population using standardized definitions and methodology. Over 3,800 women who delivered in an 8-month period in the Wellington region were included in the study. Blood pressure measurement and the presence of oedema and proteinuria were recorded from booking until delivery and in the puerperium. Only 2.7% of women were unable to be contacted after delivery for details on outcomes. The results established normal ranges for blood pressure throughout pregnancy. The data show that Mood pressure greater than 140/90 until 35 weeks' gestation is outside 2 standard deviations at all gestations and justifies using these measurements as the definition of hypertension in pregnancy. The fall in blood pressure in the 2nd trimester was less than 1 mm Ffg per week in both the systolic and diastolic pressures. This fall was smaller than previously recorded in other studies. Gestational hypertension was the commonest blood pressure abnormality occurring in 15.2% of the population. This represented 69% of the pregnant women with a hypertensive disorder. The overall incidence of both gestational hypertension and preeclampsia was 18.5% which is higher than reported in other parts of the world. In this study obesity was significantly associated with hypertensive disorders in pregnancy. An arm circumference of >33 cm, one of the measurements of obesity, was found in 6.8% of the study population. Even after the effect of arm circumference was taken into account, hypertensive disorders were also more common in Pacific Island women. Ankle oedema was significantly associated with the development of both gestational hypertension and preeclampsia but the incidence of oedema was noted in only 11.9% of the subjects.  相似文献   
30.
Entering the postmodern world in which society is confronting crossroads, paradoxes, and complexity, the health care system is encountering a transformation more comprehensive and revolutionary than has ever been seen before. Analysis of the state of nursing vis a vis these transformations indicates that the current paradigm does not ensure the existence of the profession in the postmodern health care system. That is because of increased difficulties in consolidating the economic and quality issues into the core of nursing, and in understanding the complexity inherent in health related situations.  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