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   2071054篇
  免费   154603篇
  国内免费   4254篇
耳鼻咽喉   28918篇
儿科学   70081篇
妇产科学   59803篇
基础医学   301831篇
口腔科学   58525篇
临床医学   182387篇
内科学   402294篇
皮肤病学   45357篇
神经病学   162821篇
特种医学   80722篇
外国民族医学   652篇
外科学   315428篇
综合类   46518篇
现状与发展   1篇
一般理论   653篇
预防医学   157684篇
眼科学   47943篇
药学   154411篇
  4篇
中国医学   4066篇
肿瘤学   109812篇
  2018年   20441篇
  2016年   17761篇
  2015年   20227篇
  2014年   27850篇
  2013年   42602篇
  2012年   57213篇
  2011年   61255篇
  2010年   36598篇
  2009年   34437篇
  2008年   58449篇
  2007年   62746篇
  2006年   63823篇
  2005年   61816篇
  2004年   59937篇
  2003年   58037篇
  2002年   56662篇
  2001年   93656篇
  2000年   95887篇
  1999年   81098篇
  1998年   23183篇
  1997年   20802篇
  1996年   20980篇
  1995年   19996篇
  1994年   18840篇
  1993年   17472篇
  1992年   65623篇
  1991年   64552篇
  1990年   63765篇
  1989年   61706篇
  1988年   56938篇
  1987年   56438篇
  1986年   53331篇
  1985年   51185篇
  1984年   38420篇
  1983年   32980篇
  1982年   19771篇
  1981年   17630篇
  1979年   36077篇
  1978年   25725篇
  1977年   22033篇
  1976年   20905篇
  1975年   22441篇
  1974年   26751篇
  1973年   25820篇
  1972年   24172篇
  1971年   22583篇
  1970年   20951篇
  1969年   19900篇
  1968年   18596篇
  1967年   16533篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
161.
162.
Bulletin of Experimental Biology and Medicine - Fast neutron therapy, which previously has demonstrated effective results, but along with a large number of complications, can again be considered a...  相似文献   
163.
Background: Most theoretical models of self-determination suggest that both environmental and personal factors influence the development of self-determination. The design and implementation of interventions must be conducted with foreknowledge of such mediating and moderating factors if the intervention is to be successful.

Methods: The purpose of this study was to examine the degree to which several personal factors and school characteristics affect and explain students’ self-determination. A total of 232 students with intellectual disability from Spain participated. Their self-determination level was assessed by the ARC-INICO Scale.

Results: Students with moderate levels of intellectual disability obtained significantly lower scores on self-determination than their peers with mild intellectual disability. There were significant differences in relation to the level of support needs and their experience with transition programs. The level of support needs was a significant predictor.

Conclusion: These findings contribute to current research in this field and practical implications were discussed.  相似文献   

164.
International Journal of Clinical Pharmacy - Background Drug-related problems (DRP) following hospital discharge may cause morbidity, mortality and hospital re-admissions. It is unclear whether a...  相似文献   
165.

Introduction

In the phase II/III KEYNOTE-010 study (ClinicalTrials.gov, NCT01905657), pembrolizumab significantly prolonged overall survival over docetaxel in patients with previously treated, programmed death ligand 1–expressing (tumor proportion score ≥ 1%), advanced NSCLC. Health-related quality of life (HRQoL) results are reported here.

Methods

Patients were randomized 1:1:1 to pembrolizumab 2 or 10 mg/kg every 3 weeks or docetaxel 75 mg/m2 every 3 weeks. HRQoL was assessed using European Organisation for Research and Treatment of Cancer (EORTC) Quality of Life Questionnaire (QLC) Core 30 (C30), EORTC QLQ–Lung Cancer 13 (LC13), and EuroQoL-5D. Key analyses included mean baseline-to-week-12 change in global health status (GHS)/quality of life (QoL) score, functioning and symptom domains, and time to deterioration in a QLQ-LC13 composite endpoint of cough, dyspnea, and chest pain.

Results

Patient reported outcomes compliance was high across all three instruments. Pembrolizumab was associated with better QLQ-C30 GHS/QoL scores from baseline to 12 weeks than docetaxel, regardless of pembrolizumab dose or tumor proportion score status (not significant). Compared with docetaxel, fewer pembrolizumab-treated patients had “deteriorated” status and more had “improved” status in GHS/QoL. Nominally significant improvement was reported in many EORTC symptom domains with pembrolizumab, and nominally significant worsening was reported with docetaxel. Significant prolongation in true time to deterioration for the QLQ-LC13 composite endpoint emerged for pembrolizumab 10 mg/kg compared to docetaxel (nominal two-sided p = 0.03), but not for the 2-mg/kg dose.

Conclusions

These findings suggest that HRQoL and symptoms are maintained or improved to a greater degree with pembrolizumab than with docetaxel in this NSCLC patient population.  相似文献   
166.
167.
168.
169.
170.
Using data on waterfowl band recoveries, we identified spatially explicit hotspots of concentrated waterfowl movement to predict occurrence and spatial spread of a novel influenza A virus (clade 2.3.4.4) introduced from Asia by waterfowl from an initial outbreak in North America in November 2014. In response to the outbreak, the hotspots of waterfowl movement were used to help guide sampling for clade 2.3.4.4 viruses in waterfowl as an early warning for the US poultry industry during the outbreak . After surveillance sampling of waterfowl, we tested whether there was greater detection of clade 2.3.4.4 viruses inside hotspots. We found that hotspots defined using kernel density estimates of waterfowl band recoveries worked well in predicting areas with higher prevalence of the viruses in waterfowl. This approach exemplifies the value of ecological knowledge in predicting risk to agricultural security.  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