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   24161篇
  免费   2504篇
  国内免费   105篇
耳鼻咽喉   196篇
儿科学   910篇
妇产科学   652篇
基础医学   3432篇
口腔科学   371篇
临床医学   3511篇
内科学   5250篇
皮肤病学   577篇
神经病学   2504篇
特种医学   558篇
外国民族医学   4篇
外科学   2345篇
综合类   210篇
一般理论   5篇
预防医学   2423篇
眼科学   296篇
药学   1595篇
中国医学   19篇
肿瘤学   1912篇
  2023年   246篇
  2022年   379篇
  2021年   762篇
  2020年   607篇
  2019年   924篇
  2018年   1017篇
  2017年   795篇
  2016年   839篇
  2015年   885篇
  2014年   1073篇
  2013年   1463篇
  2012年   1859篇
  2011年   1770篇
  2010年   1126篇
  2009年   1004篇
  2008年   1515篇
  2007年   1500篇
  2006年   1386篇
  2005年   1298篇
  2004年   1222篇
  2003年   1089篇
  2002年   1006篇
  2001年   222篇
  2000年   207篇
  1999年   220篇
  1998年   243篇
  1997年   190篇
  1996年   149篇
  1995年   149篇
  1994年   130篇
  1993年   109篇
  1992年   89篇
  1991年   92篇
  1990年   87篇
  1989年   77篇
  1988年   66篇
  1987年   48篇
  1986年   65篇
  1985年   58篇
  1984年   61篇
  1983年   61篇
  1982年   70篇
  1981年   69篇
  1980年   41篇
  1979年   28篇
  1978年   35篇
  1977年   42篇
  1976年   50篇
  1975年   38篇
  1974年   40篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
This is the third and final part of a series of articles that report the findings of a study that investigated the effects of a summer externship program on the transition into a professional role among nurses who participated in a summer nurse externship program at an acute care pediatric hospital. Specifically, this article reports the retention and recruitment benefits of a summer nurse externship program for the institution from 1998 through 2003. A total of 153 externs out of the 193 (79.0%) assumed a registered nurse position at the institution, and 77% remained in that role for 12 months. Overall, the nurse extern program for this institution appeared to be an effective recruitment and retention strategy that is on par with the institution and national data for retention and turnover data.  相似文献   
4.
5.
6.
OBJECTIVE: To investigate whether orofacial tardive dyskinesia (OTD) is associated with frontal lobe dysfunction and whether either are related to the coping abilities independent of psychiatric symptoms in older people with psychotic disorders. METHODS: A total of 52 patients, aged over 65 years or over, who satisfied International Classification of Diseases, Tenth Revision criteria for psychotic disorders (F20-F29) were recruited into the study. OTD was measured using the Abnormal Involuntary Movements Scale and Waddington et al.'s (1993) criteria. Neuropsychological measures were specifically selected to assess different aspects of frontal function and coping was measured using a semistructured interview. Psychiatric symptoms were assessed using the Positive and Negative Syndrome Scale (PANSS). RESULTS: Patients with OTD showed more severe global cognitive impairment compared to patients without OTD. Group differences on measures of frontal lobe dysfunction were not maintained following adjustment for global cognitive impairment. Patients with OTD did not differ from patients without OTD on coping measures. Scores on the general psychopathology subscale of the PANSS, which includes symptoms associated with depression and anxiety, consistently predicted patients' negative perceptions of stressors and appraisals of coping, but cognitive impairment did not predict coping independent of symptoms. CONCLUSION: The association between coping and general psychopathology in older patients with psychosis warrants further investigation as both variables may be amenable to psychological interventions.  相似文献   
7.
8.
9.
ABSTRACT I explore a bisexual male patient's need to differentiate highly problematic'feminine'identifications - originating in childhood sexual abuse and impingement by men as well as women - from identifications with more admired aspects of his mother. My main focus is on the patient's sexual identity - the personal meaning he gave to being male - rather than on his bisexuality - his desire for both sexes. In psychoanalytic literature powerful opposite-sex identifications are usually associated either with psychotic confusion or celebrated as a source of psychic strength. The co-existence of problematic and highly valued cross-sex identifications is rarely discussed. I also look at how this patient re-negotiated his identity through the transference relationship with a female psychotherapist, given that his'masculinity'derived mainly from childhood experiences of 'stealing'his mother's phallic power. Through a wideranging theoretical review I conclude that we need to draw together opposing psychoanalytic perspectives about maternal and paternal power, opening up new ways of thinking about triangular relationships in the transference.  相似文献   
10.
The mechanism of release from sustained-release adinazolam mesylate tablets was assessed by the Higuchi equation and by analysis of drug release profiles through 60% released using the Peppas equation. Computed values of the diffusional exponent, n, ranged from 0.59 to 0.66. Values of n in this range are consistent with a mixed mechanism of release, with diffusion of drug through the hydrated polymer matrix and relaxation of this matrix being the principal processes controlling release. The rate of in vitro drug release was increased for half tablets relative to whole tablets and is attributed to an increase in the surface to volume ratio of half tablets of about 16%. This increase in surface-to-volume ratio of half tablets was reflected by an increase in the constant, k, from the Peppas equation of 20–23% and by an increase in the slope of Higuchi plots of 12–18% for four lots of tablets. In vivo/in vitro relationships from two bioavailability studies were thoroughly evaluated. Using either a linear or a quadratic relationship, an in vivo/in vitro correlation exists for sustained-release adinazolam mesylate tablets.  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