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   46598篇
  免费   3906篇
  国内免费   912篇
耳鼻咽喉   195篇
儿科学   870篇
妇产科学   1861篇
基础医学   2304篇
口腔科学   564篇
临床医学   14103篇
内科学   6945篇
皮肤病学   475篇
神经病学   2143篇
特种医学   2604篇
外国民族医学   6篇
外科学   4223篇
综合类   7504篇
现状与发展   3篇
一般理论   3篇
预防医学   1988篇
眼科学   1136篇
药学   2294篇
  55篇
中国医学   805篇
肿瘤学   1335篇
  2024年   73篇
  2023年   642篇
  2022年   1003篇
  2021年   1469篇
  2020年   1841篇
  2019年   1621篇
  2018年   1641篇
  2017年   1668篇
  2016年   1661篇
  2015年   1712篇
  2014年   3136篇
  2013年   3089篇
  2012年   2530篇
  2011年   2848篇
  2010年   2351篇
  2009年   2239篇
  2008年   2338篇
  2007年   2517篇
  2006年   2254篇
  2005年   1984篇
  2004年   1722篇
  2003年   1443篇
  2002年   1218篇
  2001年   1161篇
  2000年   918篇
  1999年   865篇
  1998年   726篇
  1997年   697篇
  1996年   605篇
  1995年   542篇
  1994年   455篇
  1993年   373篇
  1992年   318篇
  1991年   300篇
  1990年   224篇
  1989年   163篇
  1988年   156篇
  1987年   125篇
  1986年   121篇
  1985年   170篇
  1984年   126篇
  1983年   58篇
  1982年   87篇
  1981年   61篇
  1980年   43篇
  1979年   36篇
  1978年   22篇
  1977年   19篇
  1976年   18篇
  1974年   6篇
排序方式: 共有10000条查询结果,搜索用时 640 毫秒
1.
2.
目的探讨多元化联合教学模式在超声引导下疼痛介入治疗教学中的应用效果。方法选择2018年1月至2020年12月在北京大学第三医院疼痛科进修的30名医师作为研究对象,将其分为对照组与观察组;对照组采用常规教学模式;观察组采用多元化联合教学模式,比较两组医师技能考核成绩、教学质量评分和满意度评分。结果观察组医师技能考核成绩优良率为93.3%,高于对照组的73.3%(P<0.05);观察组医师对基础理论知识掌握、临床思维能力的提高、学习兴趣的激发、疾病诊治能力的提高4个方面的评分均高于对照组(P<0.01)。结论多元化联合教学模式可促进超声引导下疼痛介入治疗技能的提高,有利于提高学员的综合临床能力。  相似文献   
3.
BackgroundObstructed hemivagina and ipsilateral renal anomaly (OHVIRA) syndrome is usually diagnose during adolescence due to pain-related symptoms; however, this syndrome can go unrecognized for several years, and unique presentations may occur later in life.CaseWe describe a 24-year-old-woman diagnosed with previously unknown OHVIRA syndrome and a 7-week intrauterine pregnancy in the obstructed side by the unique ultrasound image obtained during routine first-trimester ultrasonography. The patient was managed with single-stage vaginoplasty, and the rest of the pregnancy were uneventful.Summary and ConclusionThis report is unique in terms of showing that the pregnancy could develop in the uterine cavity on the side of the obstruction despite the blind hemivagina.  相似文献   
4.
5.
Although depression is associated to physical discomfort, meanings of the body in depression are rarely addressed in clinical research. Drawing on the concept of the lived body, this study explores depression as an embodied phenomenon. Using a hermeneutic phenomenological approach, the analysis of narrative‐based interviews with 11 depressed adults discloses a thematic structure of an embodied process of an ambiguous striving against fading. Five subthemes elicit different dimensions of this process, interpreted as disabling or enabling: feeling estranged, feeling confined, feeling burdensome, sensing life and seeking belongingness. In relation to clinical practice, we suggest that the interdisciplinary team can focus on enhancing the enabling dimensions, for example through guided physical activities to support the patient to feel more alive, capable and connected. Moreover, we suggest that the treatment process benefits from an increased awareness of the ambiguity in the patient's struggle, acknowledging both destructive and recharging elements of the withdrawing, and the perceived conflict in‐between.  相似文献   
6.
Transplant ureteric stent insertion reduces the incidence of MUCs, but it is not known whether routine PSRGU is needed to detect unmasked MUCs. This study evaluated whether routine PSRGU in the pRTR is a useful tool to identify MUCs before they become clinically apparent. A retrospective analysis was undertaken of the clinical outcomes following elective stent removal from pediatric kidney‐only transplant recipients at two London centers between 2012 and 2016. Our policy was to perform PSRGU either routinely or urgently if there were concerning symptoms or biochemical evidence of renal allograft dysfunction. Elective stent removal was performed in 86% (97 of 113 pRTR), and 75 (77%) of whom had routine PSRGU at a median (IQR) of 6 (2‐8) days after stent removal. There were changes to management in 3 (4%) of pRTR with PSRGU identifying no MUC. Nineteen patients (25%) had urgent PSRGU, most commonly due to renal allograft dysfunction, at a median (IQR) of 5.5 (2.7‐12.3) days after stent removal. Of these, two pRTR required ureteric intervention. For our current practice of removing transplant stents at 4‐6 weeks post‐transplantation, our study has found no evidence to support routine PSRGU after elective stent removal.  相似文献   
7.
8.
目的:总结后颅窝正常和异常的胎儿小脑及小脑蚓部的矢状面的声像学特征,了解小脑细微结构的改变与胎儿畸形的关系。  相似文献   
9.
Objective: To determine whether packed red blood cell (PRBC) transfusion affects post-prandial superior mesenteric artery blood flow velocities (SMA BFVs) in very-low birth weight (VLBW) neonates and if so, at what time point after transfusion restoration of previous SMA BFV patterns occurs.

Design/Methods: VLBW pre-term neonates, older than 14 days and tolerating bolus enteral feedings administered every 3?h were enrolled in this prospective observational study. Pulsed Doppler ultrasound was used to measure pre- and post-prandial (at 45?min) time-averaged mean, peak and end diastolic velocities (TAMV, PSV, EDV) immediately before and after 15?ml/kg of PRBC transfusion was given over 3?h; patent ductus arteriosus (PDA) status was also evaluated. Subsequent pre- and post-prandial SMA BFVs were recorded 24 and 48?h after the transfusion.

Results: Pre- and post-prandial measurements were obtained for 21 out of 25 enrolled infants. Post-prandial SMA BFVs were attenuated during the feedings immediately after transfusion; at 24 and 48?h after transfusion, changes in post-prandial SMA BFVs were similar to those measured prior to transfusion; the presence of the PDA did not affect results.

Conclusions: PRBC transfusion blunted SMA BFV responses to feedings immediately after the transfusion with normalization observed 24?h post-transfusion.  相似文献   
10.
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