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   50224篇
  免费   3489篇
  国内免费   104篇
耳鼻咽喉   386篇
儿科学   1886篇
妇产科学   1787篇
基础医学   5970篇
口腔科学   599篇
临床医学   8789篇
内科学   9118篇
皮肤病学   752篇
神经病学   4551篇
特种医学   882篇
外国民族医学   33篇
外科学   4380篇
综合类   614篇
一般理论   79篇
预防医学   7066篇
眼科学   539篇
药学   2827篇
  1篇
中国医学   89篇
肿瘤学   3469篇
  2023年   298篇
  2022年   430篇
  2021年   983篇
  2020年   659篇
  2019年   1070篇
  2018年   1221篇
  2017年   840篇
  2016年   961篇
  2015年   1039篇
  2014年   1429篇
  2013年   2398篇
  2012年   3421篇
  2011年   3666篇
  2010年   1954篇
  2009年   1830篇
  2008年   3236篇
  2007年   3689篇
  2006年   3552篇
  2005年   3451篇
  2004年   3332篇
  2003年   3170篇
  2002年   2995篇
  2001年   388篇
  2000年   283篇
  1999年   401篇
  1998年   656篇
  1997年   515篇
  1996年   448篇
  1995年   368篇
  1994年   372篇
  1993年   364篇
  1992年   263篇
  1991年   231篇
  1990年   222篇
  1989年   175篇
  1988年   178篇
  1987年   187篇
  1986年   158篇
  1985年   186篇
  1984年   210篇
  1983年   212篇
  1982年   266篇
  1981年   246篇
  1980年   193篇
  1979年   135篇
  1978年   114篇
  1977年   132篇
  1976年   111篇
  1975年   93篇
  1973年   87篇
排序方式: 共有10000条查询结果,搜索用时 25 毫秒
991.
Attention to health care quality and safety has increased dramatically. The internal focus of an organization is not without influence from external policy and research findings. Compared with other specialties, efforts to align and advance rehabilitation research, practice, and policy using electronic health record data are in the early stages. This special communication defines quality, applies the dimensions of quality to rehabilitation, and illustrates the feasibility and utility of electronic health record data for research on rehabilitation care quality and outcomes. Using data generated at the point of care provides the greatest opportunity for improving the quality of health care, producing generalizable evidence to inform policy and practice, and ultimately benefiting the health of the populations served.  相似文献   
992.
993.
994.

Objectives

Urine microscopy is a common test performed in emergency departments (EDs). Urine specimens can easily become contaminated by different factors, including the collection method. The midstream clean-catch (MSCC) collection technique is commonly used to reduce urine contamination. The urine culture contamination rate from specimens collected in our ED is 30%. We developed an instructional application (app) to show ED patients how to provide a MSCC urine sample. We hypothesized that ED patients who viewed our instructional app would have significantly lower urine contamination rates compared to patients who did not.

Methods

We prospectively enrolled 257 subjects with a urinalysis and/or urine culture test ordered in the ED and asked them to watch our MSCC instructional app. After prospective enrollment was complete, we retrospectively matched each enrolled subject to an ED patient who did not watch the instructional app. Controls were matched to cases based on gender, type of urine specimen provided, ED visit date and shift. Urinalysis and urine culture contamination results were compared between the matched pairs using McNemar's test.

Results

The overall urine culture contamination rate of the 514 subjects was 38%. The majority of the matched pairs had a urinalysis (63%) or urinalysis plus urine culture (35%) test done. There were no significant differences in our urine contamination rates between the matched pairs overall or when stratified by gender, by prior knowledge of the clean catch process or by type of urine specimen.

Conclusion

We did not see a lower contamination rate for patients who viewed our instructional app compared to patients who did not. It is possible that MSCC is not effective for decreasing urine specimen contamination.  相似文献   
995.
Fatigability is defined as the extent of fatigue in the context of activity and differs from the term used in exercise literature to describe muscle endurance characteristics. Many fatigability measures are available, but no studies have thoroughly evaluated them for adequate incorporation of fatigability concepts. This integrative review provides an overall assessment of existing fatigability measures and then evaluates each in depth. A database search and hand search produced 14 studies for review. Fatigability measurement took three forms: self-reported fatigability, perceived fatigability (self-reported fatigue following a defined performance test), and performance fatigability (performance deterioration). Of 17 measures identified, validity and/or reliability was reported for six (35.3%), and no measure was used in more than one study. Fatigability measures have been correlated with clinical measures, indicating that fatigability should be measured during routine clinical health screening. Refinement of measures and additional fatigability data collection will improve understanding and treatment of fatigue.  相似文献   
996.
The purpose of this study was to explore the efficacy and acceptability of an innovative, electronically delivered self-management intervention for urinary incontinence (UI) that included daily mindfulness practice, completion of sequential bladder diaries, and bladder health education to improve UI in older women living independently in a retirement community. A mixed methods pilot study was conducted over ten weeks using a custom website or CD. Ten women were recruited and 8 completed the study; 5 of those (71%) experienced fewer daily UI episodes post intervention (p = 0.055). The women also reported a statistically significant decrease in the impact UI had on their everyday life (p = 0.04). Seventy-one percent (N = 5) reported subjective improvement in UI, and high acceptability scores also were achieved. The intervention was both effective in helping older women self-manage UI and acceptable to the population group. Further research is needed with a larger and diverse population of older women.  相似文献   
997.

Context

Attrition is common in longitudinal observational studies in palliative care. Few studies have examined predictors of attrition.

Objectives

To identify patient characteristics at enrollment associated with attrition in palliative oncology outpatient setting.

Methods

In this longitudinal observational study, advanced cancer patients enrolled in an outpatient multicenter study were assessed at baseline and two to five weeks later. We compared baseline characteristics between patients who returned for follow-up and those who dropped out.

Results

Seven hundred forty-four patients were enrolled from Jordan, Brazil, Chile, Korea, and India. Attrition rate was 33%, with variation among countries (22%–39%; P = 0.023). In univariate analysis, baseline predictors for attrition were cognitive failure (odds ratio [OR] 1.23 per point in Memorial Delirium Assessment Scale; P < 0.01), functional status (OR 1.55 per 10-point decrease in Karnofsky Performance Status; P < 0.01), Edmonton Symptom Assessment Scale [ESAS] physical score (OR 1.03 per point; P < 0.01), ESAS emotional score (OR 1.05 per point; P < 0.01), and shorter duration between cancer diagnosis and palliative care referral in months (OR 0.89 per log; P = 0.028). In multivariate analysis, cognitive failure (OR 1.12 per point; P = 0.007), ESAS physical score (OR 1.18 per point; P = 0.027), functional status (OR 1.35 per 10-point decrease; P < 0.001), and shorter duration from cancer diagnosis (OR 0.86 per log; P = 0.01) remained independent predictors of attrition.

Conclusion

Advanced cancer patients with cognitive failure, increased physical symptoms, poorer performance status, and shorter duration from cancer diagnosis were more likely to dropout. These results have implications for research design, patient selection, and data interpretation in longitudinal observational studies.  相似文献   
998.
Purpose: In this paper, we present our experiences – both successes and challenges – in implementing evidence-based classification tools into clinical practice. We also make recommendations for others wanting to promote the uptake and application of new research-based assessment tools.

Method: We first describe classification systems and the benefits of using them in both research and practice. We then present a theoretical framework from Implementation Science to report strategies we have used to implement two research-based classification tools into practice. We also illustrate some of the challenges we have encountered by reporting results from an online survey investigating 58 Speech-language Pathologists’ knowledge and use of the Communication Function Classification System (CFCS), a new tool to classify children’s functional communication skills.

Result and conclusions: We offer recommendations for researchers wanting to promote the uptake of new tools in clinical practice. Specifically, we identify structural, organizational, innovation, practitioner, and patient-related factors that we recommend researchers address in the design of implementation interventions. Roles and responsibilities of both researchers and clinicians in making implementations science a success are presented.

  • Implications for rehabilitation
  • Promoting uptake of new and evidence-based tools into clinical practice is challenging.

  • Implementation science can help researchers to close the knowledge-to-practice gap.

  • Using concrete examples, we discuss our experiences in implementing evidence-based classification tools into practice within a theoretical framework.

  • Recommendations are provided for researchers wanting to implement new tools in clinical practice. Implications for researchers and clinicians are presented.

  相似文献   
999.
While knowledge about the World Health Organisation’s (WHO) healthy schools model has been developed in recent years, process implementation and outcomes for school children have not improved in line with these advances. This deficit has become known as the ‘implementation gap’ and refers to the difference between the evidence of what works in theory and what is delivered in practice. The aim of this research was to evaluate the first implementation and impact of the WHO model among urban disadvantaged school children in Ireland from 2008 to 2012. A concurrent mixed methods study design was used. A process evaluation-mapped implementation and a three-year cohort study measured the impact. Data comprised of semi-structured interviews, focus groups and documentary analysis. Instruments included the Kidscreen-27 and the Child Depression Inventory (CDI). Over 600 children in five intervention and two comparison schools were recruited. The process evaluation revealed that top-down decision making based on the communities rather than each individual school’s needs and a lack of understanding of the concept of the whole school approach inhibited implementation. No significant differences were found between intervention and comparison of schools over three years post implementation. The successful implementation within an urban disadvantaged region requires not an analysis of the regional needs but a development of the individual school needs and sufficient lead-in time to ensure that each school is ready in terms of its understanding. Furthermore, healthy schools coordinators roles need to be clarified as facilitators of development and change rather than as unsustainable providers of health activities.  相似文献   
1000.
The limited Australian measures to reduce population sodium intake through national initiatives targeting sodium in the food supply have not been evaluated. The aim was, thus, to assess if there has been a change in salt intake and discretionary salt use between 2011 and 2014 in the state of Victoria, Australia. Adults drawn from a population sample provided 24 h urine collections and reported discretionary salt use in 2011 and 2014. The final sample included 307 subjects who participated in both surveys, 291 who participated in 2011 only, and 135 subjects who participated in 2014 only. Analysis included adjustment for age, gender, metropolitan area, weekend collection and participation in both surveys, where appropriate. In 2011, 598 participants: 53% female, age 57.1(12.0)(SD) years and in 2014, 442 participants: 53% female, age 61.2(10.7) years provided valid urine collections, with no difference in the mean urinary salt excretion between 2011: 7.9 (7.6, 8.2) (95% CI) g/salt/day and 2014: 7.8 (7.5, 8.1) g/salt/day (p = 0.589), and no difference in discretionary salt use: 35% (2011) and 36% (2014) reported adding salt sometimes or often/always at the table (p = 0.76). Those that sometimes or often/always added salt at the table and when cooking had 0.7 (0.7, 0.8) g/salt/day (p = 0.0016) higher salt excretion. There is no indication over this 3-year period that national salt reduction initiatives targeting the food supply have resulted in a population reduction in salt intake. More concerted efforts are required to reduce the salt content of manufactured foods, together with a consumer education campaign targeting the use of discretionary salt.  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