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   2982篇
  免费   132篇
  国内免费   26篇
耳鼻咽喉   543篇
儿科学   44篇
妇产科学   11篇
基础医学   198篇
口腔科学   223篇
临床医学   459篇
内科学   72篇
皮肤病学   12篇
神经病学   56篇
特种医学   180篇
外科学   600篇
综合类   235篇
预防医学   77篇
眼科学   6篇
药学   68篇
  1篇
中国医学   148篇
肿瘤学   207篇
  2024年   6篇
  2023年   50篇
  2022年   89篇
  2021年   114篇
  2020年   85篇
  2019年   164篇
  2018年   187篇
  2017年   121篇
  2016年   110篇
  2015年   74篇
  2014年   242篇
  2013年   173篇
  2012年   170篇
  2011年   184篇
  2010年   140篇
  2009年   147篇
  2008年   152篇
  2007年   138篇
  2006年   127篇
  2005年   92篇
  2004年   67篇
  2003年   56篇
  2002年   44篇
  2001年   45篇
  2000年   39篇
  1999年   34篇
  1998年   34篇
  1997年   25篇
  1996年   16篇
  1995年   10篇
  1994年   22篇
  1993年   16篇
  1992年   15篇
  1991年   19篇
  1990年   6篇
  1989年   8篇
  1988年   11篇
  1987年   6篇
  1985年   14篇
  1984年   24篇
  1983年   12篇
  1982年   9篇
  1981年   7篇
  1980年   7篇
  1979年   13篇
  1977年   4篇
  1976年   3篇
  1975年   2篇
  1974年   2篇
  1973年   2篇
排序方式: 共有3140条查询结果,搜索用时 15 毫秒
81.
目的:观察足针配合项针治疗重型脑卒中的临床疗效。方法:足针疗法治疗重型脑卒中,有吞咽困难或失语患者配合项针治疗。结果:治疗后总有效率为95%。结论:足针配合项针治疗脑卒中疗效显著。  相似文献   
82.
83.
Despite the increased interest in economic evaluations, there are difficulties in applying the results of such studies in practice. Therefore, the “Research Agenda for Health Economic Evaluation” (RAHEE) project was initiated, which aimed to improve the use of health economic evidence in practice for the 10 highest burden conditions in the European Union (including low back pain [LBP] and neck pain [NP]). This was done by undertaking literature mapping and convening an Expert Panel meeting, during which the literature mapping results were discussed and evidence gaps and methodological constraints were identified. The current paper is a part of the RAHEE project and aimed to identify economic evidence gaps and methodological constraints in the LBP and NP literature, in particular.The literature mapping revealed that economic evidence was unavailable for various commonly used LBP and NP treatments (e.g., injections, traction, and discography). Even if economic evidence was available, many treatments were only evaluated in a single study or studies for the same intervention were highly heterogeneous in terms of their patient population, control condition, follow-up duration, setting, and/or economic perspective. Up until now, this has prevented economic evaluation results from being statistically pooled in the LBP and NP literature, and strong conclusions about the cost-effectiveness of LBP and NP treatments can therefore not be made. The Expert Panel identified the need for further high-quality economic evaluations, especially on surgery versus conservative care and competing treatment options for chronic LBP. Handling of uncertainty and reporting quality were considered the most important methodological challenges.  相似文献   
84.
The aim of this article was to describe an apparatus, called multipurpose neck robot (MUPRO), designed to record both the forces exerted at head level and the head rotations in the horizontal plane in the behaving monkey. It consists of a mechanical device, comprising a cardan joint, a potentiometer, an electromagnetic brake, and four flexion load cells, plus an oleodynamic system allowing head rotation in the horizontal plane between &#45 20° These components are assembled on a column bolted to the primate s chair. An electrical device provides DC power for the potentiometer and the brake. The apparatus enables us to measure both the force fields and the head movements during training sessions and electrophysiological investigations.  相似文献   
85.
《Injury》2017,48(6):1155-1158
ObjectivesTo determine if early surgery before 12 h confers a survival or length of stay benefit for patients with neck of femur (NOF) fractures.DesignRetrospective review of prospectively collected data.SettingDistrict general hospital.Patients1913 patients aged over 60 admitted with a fractured NOF who underwent surgery between 2011 and 2015. Mean age was 83.9 years. 73.7% were female.InterventionPatients had surgery for fractured NOF with data collected on demographics, mortality and length of stay.Main outcome measurementsData collected included gender, age, ASA grade, fracture anatomy, surgery, time to surgery, days spent in acute hospital and rehabilitation settings and 30-day mortality. Statistical analysis was used to identify independent predictors of mortality and length of stay.Results30-day mortality was 6.1% and the mean hospitalisation time was 13 ± 11.3 days for the acute hospital and 20.2 ± 17.2 days for the trust. Operations were performed at a mean of 23.8 ± 14.8 h after presentation. Age, gender, ASA grade and type of fracture were independent predictors of either mortality or length of stay. Timing of surgery had an association with mortality but this only reached statistical significance at 24 h.In line with previous studies we analysed time to surgery in 12 h blocks. We also used logistic regression, recognizing time as a continuous variable, which revealed that every hour of delay to surgery increased the mortality risk by 1.8%.ConclusionsWhile every hour of delay increased mortality risk, the association with mortality only became statistically significant when delaying over 24 h. This supports a pragmatic approach, with surgery as soon as medically possible without a race to theatre.Level of evidenceLevel III retrospective cohort study.  相似文献   
86.
目的:探讨区Ⅱ淋巴结清扫术治疗脓肿型颈部淋巴结结核的临床疗效。方法总结2008年9月~2013年6月我院收治的77例脓肿型颈部淋巴结结核,随机分为手术组及对照组,手术组34例行区Ⅱ淋巴结清扫术,对照组33例予局部处理及换药,两组均予正规抗结核治疗。结果手术组的治愈率为82.35%,对照组的治愈率为36.36%,差异有统计学意义(<0.05)。结论区Ⅱ淋巴结清扫术治疗脓肿型颈部淋巴结结核,治愈率高,安全可行。  相似文献   
87.
88.
89.

Background

As one of the most common work-related musculoskeletal disorders and postural deviations, forward head posture (FHP), is considered to lead to muscle imbalance.

Objectives

The aim of this study is to investigate the bilateral cross-sectional area (CSA) of the deep neck flexor muscles at rest and during five stages of the craniocervical flexion (CCF) test in individuals with FHP and the controls with normal head posture.

Methods

Eighteen students with FHP and 18 controls with normal head posture, all females aged 18–35 years, participated in this study. Participants were categorized into two groups based on their craniovertebral angle. The CSA of the deep neck flexors was measured using ultrasonography while participants lay supine on the table with a pressure biofeedback unit placed under their necks in order to let the examiner measure the CSA of the muscles during rest and five stages of the CCF test including 22, 24, 26, 28, and 30 mmHg of the pressure biofeedback unit.

Results

A significant effect of contraction level was observed in both groups, indicating significant increases of the CSA of the deep neck flexors during contraction (F = 64.37, P < 0.001). No significant difference was evident for the CSA of the deep neck flexors between the groups, although the increase in the CSA of the deep neck flexors was up to 28 mmHg in the normal head posture group compared to 26 mmHg in the FHP group.

Conclusions

The results of the present study showed no significant difference between the performance of the deep neck flexors during the CCF test in FHP and normal head posture individuals, which challenge the common belief of the deep neck flexors weakness in individuals sustaining FHP.  相似文献   
90.

Background

There is a hypothesis that the growing use of mobile phones in an inappropriate posture to text and read (text neck) could be a reason for the increasing prevalence of neck pain in the past decade. Before testing if there is an association between text neck and neck pain, it is necessary to develop reliable pragmatic tools appropriate to epidemiological studies.

Objectives

The primary aim of this study was to assess the reliability of the self-perception of text neck, as well as the reliability of physiotherapists’ classification of the text neck.

Methods

The convenience sample was composed of 113 high school students between 18 and 21 years old from a cross-sectional study. As their self-perceived posture, participants had to choose in a questionnaire one of four neck postures of a person texting on a mobile phone. The physiotherapists classified lateral photographs taken with the participants texting on a mobile phone in their habitual posture as 1 (normal), 2 (acceptable), 3 (inappropriate), and 4 (excessively inappropriate).

Results

The results showed that the test–retest reliability of the self-perception was substantial (kappa?=?0.73, 95% CI 0.54 to 0.86). The reliability of the physiotherapists’ responses, according to the photographic analysis considering the three raters, was moderate (kappa?=?0.5, 95% CI 0.39 to 0.61). Seventy-six percent of the participants with appropriate posture in the photographic analysis self-reported an inappropriate posture.

Conclusion

This study showed that the self-perception of the neck posture during mobile phone texting is reliable over time and that the physiotherapists’ classification based on photographic analysis was acceptable for epidemiological studies. Participants had a tendency to report that the posture was worse than it actually was in the photographic analysis performed by the physiotherapists.  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