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   627篇
  免费   43篇
  国内免费   16篇
耳鼻咽喉   3篇
儿科学   22篇
妇产科学   7篇
基础医学   71篇
口腔科学   18篇
临床医学   65篇
内科学   93篇
皮肤病学   13篇
神经病学   134篇
特种医学   79篇
外科学   32篇
综合类   16篇
预防医学   40篇
眼科学   16篇
药学   40篇
中国医学   1篇
肿瘤学   36篇
  2022年   5篇
  2021年   6篇
  2019年   5篇
  2018年   12篇
  2017年   4篇
  2016年   14篇
  2015年   12篇
  2014年   21篇
  2013年   29篇
  2012年   17篇
  2011年   31篇
  2010年   36篇
  2009年   30篇
  2008年   16篇
  2007年   34篇
  2006年   34篇
  2005年   24篇
  2004年   24篇
  2003年   12篇
  2002年   21篇
  2001年   20篇
  2000年   14篇
  1999年   18篇
  1998年   34篇
  1997年   28篇
  1996年   19篇
  1995年   17篇
  1994年   13篇
  1993年   10篇
  1991年   7篇
  1990年   10篇
  1989年   10篇
  1988年   9篇
  1987年   7篇
  1985年   5篇
  1983年   3篇
  1982年   7篇
  1980年   11篇
  1978年   5篇
  1977年   3篇
  1974年   4篇
  1973年   5篇
  1972年   3篇
  1971年   6篇
  1969年   2篇
  1968年   3篇
  1967年   2篇
  1958年   2篇
  1954年   2篇
  1949年   2篇
排序方式: 共有686条查询结果,搜索用时 82 毫秒
41.
42.
43.
44.
The purpose of this study was to examine the prevalence of pregnancy as well as multi-level factors (i.e., individual, family, and environment) associated with history of pregnancy among a sample of urban adolescent women seeking psychological services. Data were collected from a total of 264 sexually active, 13–18-year-old, adolescent women who participated in a larger HIV prevention study. Adolescents and one participating parent completed an audio computer-assisted self-interviewing survey. A total of 17.4 % of participants reported a history of pregnancy. A multivariable logistic regression model suggests that after controlling for empirically derived sociodemographic and behavioral covariates, absence of father in the home, family support and cohesion, and neighborhood risk were positively related to pregnancy. This study is among the first to examine multi-level factors associated with pregnancy among adolescent women diagnosed with psychological disorders. Consideration of such factors is crucial both in terms of clinical practice and in the design of pregnancy prevention programs. Collaboration between physicians and mental health providers working with adolescent women is crucial and represents an ideal opportunity to promote parental involvement and access to supportive community resources, including pregnancy prevention programs for this vulnerable population of adolescents.  相似文献   
45.
Background: Optomap uses the ultra‐wide field scanning laser ophthalmoscopy to provide retinal examination. It permits fundus examination without the use of a mydriatic, which is more comfortable for the patients. This paper determines the sensitivity and specificity of the Optomap for detecting retinal signs under non‐mydriatic conditions. Methods: Fifty‐four eyes identified with retinal/choroidal signs and eight normal eyes were recruited from 31 Hong Kong Chinese subjects. Photo‐documentation of fundal changes was obtained with the Optomap under non‐mydriatic conditions before a dilated fundus examination by a clinician using standard procedures. The eyelid was retracted using a cotton bud when necessary. Dilated fundus examinations were performed by another clinician using binocular indirect ophthalmoscopy and slitlamp biomicroscopy with a fundus lens. The Optomap images were evaluated by four other investigators under masked condition. The International Classification of Disease, Ninth Revision (ICD‐9‐CM) was adopted for recording retinal features. Screening results were compared with those obtained using the dilated fundus examination as the gold standard. Results: The cotton bud method for eyelid retraction showed an improvement in the area of retina that could be visualised. The sensitivity and specificity of the Optomap averaged 76.4 and 71.9 per cent, respectively. Some fundal signs were missed by all observers in the Optomap but not with the biomicroscope. These included white‐without‐pressure, lattice degeneration, paramacular drusen and pigmentary changes at central fundus. Conclusion: Optomap serves as a reliable screening tool for fundus examination especially because it covers a much wider area of the peripheral retina than other digital instruments for fundus photography.  相似文献   
46.
The current climate of increasing performance expectations and diminishing resources, along with innovations in evidence-based practices (EBPs), creates new dilemmas for substance abuse treatment providers, policymakers, funders, and the service delivery system. This paper describes findings from baseline interviews with representatives from 49 state substance abuse authorities (SSAs). Interviews assessed efforts aimed at facilitating EBP adoption in each state and the District of Columbia. Results suggested that SSAs are concentrating more effort on EBP implementation strategies such as education, training, and infrastructure development, and less effort on financial mechanisms, regulations, and accreditation. The majority of SSAs use EBPs as a criterion in their contracts with providers, and just over half reported that EBP use is tied to state funding. To date, Oregon remains the only state with legislation that mandates treatment expenditures for EBPs; North Carolina follows suit with legislation that requires EBP promotion within current resources.  相似文献   
47.

Background  

Epidemiologic studies are often confounded by the human and environmental interactions that are complex and dynamic spatio-temporal processes. Hence, it is difficult to discover nuances in the data and generate pertinent hypotheses. Dynamic mapping, a method to simultaneously visualize temporal and spatial information, was introduced to elucidate such complexities. A conceptual framework for dynamic mapping regarding principles and implementation methods was proposed.  相似文献   
48.
49.
50.
ABSTRACT

The National Drug Abuse Treatment Clinical Trials Network (CTN) is an alliance of drug abuse treatment programs and research centers testing new interventions and implementation factors for treating alcohol and drug use disorders. A workforce survey distributed to those providing direct services in 295 treatment units in the CTN obtained responses from 1750 individuals with a job title of counselor (n = 1395) or counselor supervisor (n = 355). A secondary analysis compares and describes both groups. Supervisors were more likely to be licensed or certified. Master's degrees were more common among counselors in outpatient and methadone programs. Counselors in residential settings tended to be on the job fewer years. Finally, higher education was associated with greater familiarity with and acceptance of evidence-based practices.  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