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   48743篇
  免费   3283篇
  国内免费   188篇
耳鼻咽喉   524篇
儿科学   1230篇
妇产科学   858篇
基础医学   6393篇
口腔科学   1249篇
临床医学   4738篇
内科学   9923篇
皮肤病学   725篇
神经病学   4773篇
特种医学   2551篇
外国民族医学   6篇
外科学   7208篇
综合类   592篇
一般理论   40篇
预防医学   4005篇
眼科学   1196篇
药学   2924篇
中国医学   69篇
肿瘤学   3210篇
  2023年   183篇
  2022年   285篇
  2021年   807篇
  2020年   612篇
  2019年   810篇
  2018年   951篇
  2017年   773篇
  2016年   914篇
  2015年   1050篇
  2014年   1468篇
  2013年   2045篇
  2012年   3102篇
  2011年   3285篇
  2010年   1866篇
  2009年   1707篇
  2008年   3054篇
  2007年   3144篇
  2006年   3105篇
  2005年   3036篇
  2004年   2844篇
  2003年   2760篇
  2002年   2655篇
  2001年   614篇
  2000年   568篇
  1999年   634篇
  1998年   602篇
  1997年   468篇
  1996年   421篇
  1995年   402篇
  1994年   322篇
  1993年   292篇
  1992年   370篇
  1991年   339篇
  1990年   308篇
  1989年   325篇
  1988年   292篇
  1987年   308篇
  1986年   279篇
  1985年   300篇
  1984年   305篇
  1983年   292篇
  1982年   318篇
  1981年   297篇
  1980年   263篇
  1979年   226篇
  1978年   233篇
  1977年   195篇
  1976年   168篇
  1975年   177篇
  1974年   183篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
181.
182.
183.
Electroencephalographic (EEG) sleep measures have been examined as predictors of therapeutic response in patients with major depression. Although some studies have reported that EEG sleep measures are predictive of a favorable outcome with medications, two recent studies found no differences in the baseline sleep characteristics of responders and nonresponders to psychotherapy. To clarify this issue, we compared baseline EEG sleep in a group of patients with recurrent depression who responded to interpersonal psychotherapy (n = 19) and a comparable group who did not respond (n = 18). Baseline ratings of depression severity did not differ in the groups, but some differences in baseline sleep were noted. Psychotherapy nonresponders had longer sleep latencies, lower sleep efficiency, and increased automated measures of phasic rapid eye movement (REM) activity. In addition, the two groups had different EEG sleep adaptation patterns for REM latency and phasic REM density measures across the two study nights. These preliminary results suggest that baseline EEG sleep patterns, as well as the pattern of laboratory adaptation, may differ for depressed patients who respond to psychotherapy and those who do not.  相似文献   
184.
The paper covers a number of morphogenetic problems of endometrial cancer with reference to multidirectional differentiation of the uterine epithelium affected by tumor. Metaplastic changes of the endometrium observable in three basic variants (tubal, endocervical, squamous cell) can entail dysplasia with resultant malignant transformation. Endometrial cancer shows complex structure of the tumor with sings of multidirectional epithelial differentiation: endometrial, tubal, endocervical, squamous). Morphological features of the tumor and adjacent mucosa, assessed comparatively, suggest a close relationship between the direction of endometrial epithelium differentiation and the new growth histological structure.  相似文献   
185.
186.
187.
The aim of this orthopaedic-biomechanical study was to evaluate lower leg muscle function in ankle osteoarthritis (OA) patients and muscle rehabilitation after the implantation of a total ankle replacement (TAR). Patients with a severe unilateral ankle OA were assessed with an orthopaedic and biomechanical examination before and one year after TAR surgery. Visual analogue pain score, American Orthopaedic Foot and Ankle Society (AOFAS) ankle score, ankle range of motion for dorsi- and plantar flexion (ROM DF/PF), and calf circumference difference between affected and contralateral healthy leg were measured. Isometric maximal voluntary torque for ankle dorsiflexion and plantar flexion were measured simultaneously with surface electromyography (EMG; mean frequency and intensity) of the anterior tibial, medial gastrocnemius, soleus, and peroneus longus muscle. Data were compared to a group of age- and gender-matched normal subjects. The mean calf circumference difference between legs did not significantly decrease from preoperative to one year follow-up. The mean dorsiflexion torque and plantar flexion torque of the affected ankle increased significantly. The atrophic muscles were characterized by a reduction of the mean EMG intensity and mean EMG frequency. In the rehabilitation process, the mean EMG intensity recovered and was not significantly different for all muscles, however, not for EMG frequency, which remained low and unchanged. This study reports for the first time in the literature the clinical and biomechanical facts of lower leg muscle atrophy in ankle OA as well as the amount of the muscle rehabilitation after a total ankle replacement. Patients with a symptomatic ankle OA achieve better function with a total ankle replacement; however, one year after the operation neuromuscular and biomechanical deficits may still be present.  相似文献   
188.
189.
190.
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