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   2128774篇
  免费   168965篇
  国内免费   7329篇
耳鼻咽喉   28207篇
儿科学   63761篇
妇产科学   56636篇
基础医学   295762篇
口腔科学   61390篇
临床医学   191627篇
内科学   429214篇
皮肤病学   48259篇
神经病学   171709篇
特种医学   85942篇
外国民族医学   347篇
外科学   338623篇
综合类   46859篇
现状与发展   3篇
一般理论   654篇
预防医学   160993篇
眼科学   46353篇
药学   156445篇
  8篇
中国医学   4091篇
肿瘤学   118185篇
  2018年   21011篇
  2016年   19369篇
  2015年   21751篇
  2014年   30130篇
  2013年   44956篇
  2012年   57094篇
  2011年   60796篇
  2010年   37218篇
  2009年   36076篇
  2008年   57629篇
  2007年   61120篇
  2006年   62700篇
  2005年   60587篇
  2004年   58045篇
  2003年   56369篇
  2002年   54327篇
  2001年   109906篇
  2000年   113451篇
  1999年   94785篇
  1998年   26031篇
  1997年   22967篇
  1996年   23884篇
  1995年   23443篇
  1994年   21841篇
  1993年   20340篇
  1992年   76112篇
  1991年   73569篇
  1990年   71022篇
  1989年   68348篇
  1988年   63019篇
  1987年   61643篇
  1986年   57979篇
  1985年   55897篇
  1984年   41437篇
  1983年   35066篇
  1982年   20459篇
  1981年   18128篇
  1980年   17015篇
  1979年   37096篇
  1978年   26125篇
  1977年   22180篇
  1976年   19989篇
  1975年   21221篇
  1974年   25254篇
  1973年   24033篇
  1972年   22498篇
  1971年   20950篇
  1970年   19424篇
  1969年   18202篇
  1968年   16781篇
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
21.
Maternal and Child Health Journal - Early life exposures can have an impact on a child’s developmental trajectory and children born late preterm (34–36 weeks gestational age)...  相似文献   
22.
23.
Introduction: Percutaneous renal mass biopsy has evolved over the last decade with improvements on previous pitfalls including low tissue yield, high non-diagnostic rates, and complications. As understanding of tumor biology and natural history of renal cortical neoplasms has improved, percutaneous renal mass biopsy is poised to have an expanding role in an area characterized by individualized management and refined risk stratification.

Areas covered: This review summarizes the evolution of renal mass biopsy to its current state with respect to outcomes, indications, and clinical guidelines.

Expert opinion: With improved understanding of differential biological potential of renal cortical neoplasms combined with technical improvements in diagnostic yield and accuracy, utilization of renal mass biopsy is becoming an important adjunct to patient care in a broad range of clinical scenarios, including active surveillance, thermal ablation, and use of primary systemic therapy in localized and advanced settings.  相似文献   

24.

Objectives

To determine: (i) the behaviour change techniques used by a sample of Australian physiotherapists to promote non-treatment physical activity; and (ii) whether those behaviour change techniques are different to the techniques used to encourage adherence to rehabilitation exercises.

Design

Cross-sectional survey.

Method

An online self-report survey was advertised to private practice and outpatient physiotherapists treating patients with musculoskeletal conditions. The use of 50 behaviour change techniques were measured using five-point Likert-type scale questions.

Results

Four-hundred and eighty-six physiotherapists responded to the survey, with 216 surveys fully completed. Most respondents (85.1%) promoted non-treatment physical activity often or all of the time. Respondents frequently used 29 behaviour change techniques to promote non-treatment physical activity or encourage adherence to rehabilitation exercises. A similar number of behaviour change techniques was frequently used to encourage adherence to rehabilitation exercises (n = 28) and promote non-treatment physical activity (n = 26). Half of the behaviour change techniques included in the survey were frequently used for both promoting non-treatment physical activity and encouraging adherence to rehabilitation exercises (n = 25). Graded tasks was the most, and punishment was the least, frequently reported technique used to promote non-treatment physical activity and encourage adherence to rehabilitation exercises.

Conclusions

Respondents reported using similar behaviour change techniques to promote non-treatment physical activity and encourage adherence to rehabilitation exercises. The variability in behaviour change technique use suggests the behaviour the physiotherapist is promoting influences their behaviour change technique choice. Including the frequently-used behaviour change techniques in non-treatment physical activity promotion interventions might improve their efficacy.  相似文献   
25.
26.
27.
28.
Monitoring variations in the functioning of the autonomic nervous system may help personalize training of runners and provide more pronounced physiological adaptations and performance improvements. We systematically reviewed the scientific literature comparing physiological adaptations and/or improvements in performance following training based on responses of the autonomic nervous system (ie, changes in heart rate variability) and predefined training. PubMed, SPORTDiscus, and Web of Science were searched systematically in July 2019. Keywords related to endurance, running, autonomic nervous system, and training. Studies were included if they (a) involved interventions consisting predominantly of running training; (b) lasted at least 3 weeks; (c) reported pre- and post-intervention assessment of running performance and/or physiological parameters; (d) included an experimental group performing training adjusted continuously on the basis of alterations in HRV and a control group; and (e) involved healthy runners. Five studies involving six interventions and 166 participants fulfilled our inclusion criteria. Four HRV-based interventions reduced the amount of moderate- and/or high-intensity training significantly. In five interventions, improvements in performance parameters (3000 m, 5000 m, Loadmax, Tlim) were more pronounced following HRV-based training. Peak oxygen uptake () and submaximal running parameters (eg, LT1, LT2) improved following both HRV-based and predefined training, with no clear difference in the extent of improvement in . Submaximal running parameters tended to improve more following HRV-based training. Research findings to date have been limited and inconsistent. Both HRV-based and predefined training improve running performance and certain submaximal physiological adaptations, with effects of the former training tending to be greater.  相似文献   
29.
30.
Pharmaceutical Chemistry Journal - An HPLC-MS method for simultaneous quantitative determination of a novel gestagenic pharmaceutical and two of its metabolites in rat and rabbit blood sera was...  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