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   2370817篇
  免费   174759篇
  国内免费   3394篇
耳鼻咽喉   32275篇
儿科学   76575篇
妇产科学   63295篇
基础医学   350266篇
口腔科学   64053篇
临床医学   216494篇
内科学   460703篇
皮肤病学   52078篇
神经病学   187662篇
特种医学   88486篇
外国民族医学   489篇
外科学   356151篇
综合类   47722篇
现状与发展   12篇
一般理论   882篇
预防医学   185941篇
眼科学   54934篇
药学   175875篇
  11篇
中国医学   4580篇
肿瘤学   130486篇
  2021年   19433篇
  2019年   19935篇
  2018年   27913篇
  2017年   21213篇
  2016年   23524篇
  2015年   26494篇
  2014年   37168篇
  2013年   55335篇
  2012年   75805篇
  2011年   80577篇
  2010年   47995篇
  2009年   45540篇
  2008年   75699篇
  2007年   80541篇
  2006年   81412篇
  2005年   78758篇
  2004年   75268篇
  2003年   72514篇
  2002年   70229篇
  2001年   109030篇
  2000年   111608篇
  1999年   93779篇
  1998年   27374篇
  1997年   23993篇
  1996年   24409篇
  1995年   22985篇
  1994年   21185篇
  1993年   19959篇
  1992年   72186篇
  1991年   70241篇
  1990年   68524篇
  1989年   65809篇
  1988年   60419篇
  1987年   59242篇
  1986年   55339篇
  1985年   53124篇
  1984年   39413篇
  1983年   33482篇
  1982年   19970篇
  1979年   35920篇
  1978年   25715篇
  1977年   21304篇
  1976年   20384篇
  1975年   21886篇
  1974年   26200篇
  1973年   24869篇
  1972年   23264篇
  1971年   22074篇
  1970年   20281篇
  1969年   19352篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
This study tests the effectiveness of adding an eight-month, thirty-session schema-focused therapy (SFT) group to treatment-as-usual (TAU) individual psychotherapy for borderline personality disorder (BPD). Patients (N = 32) were randomly assigned to SFT-TAU and TAU alone. Dropout was 0% SFT, 25% TAU. Significant reductions in BPD symptoms and global severity of psychiatric symptoms, and improved global functioning with large treatment effect sizes were found in the SFT-TAU group. At the end of treatment, 94% of SFT-TAU compared to 16% of TAU no longer met BPD diagnosis criteria (p < .001). This study supports group SFT as an effective treatment for BPD that leads to recovery and improved overall functioning.  相似文献   
992.
993.
994.
995.
996.
997.
998.
The purpose of this study was to evaluate a single-session peer-led safer sex intervention, based on the Information-Motivation-Behavioral Skills theoretical model, for college students residing in campus residence halls. Participants (N = 108) were assigned to either an hour long control or 5-module intervention session. Compared to the control condition, the intervention increased participants’ information and women’s subjective norms about preventative behavior. Both the control and intervention sessions increased intentions to perform preventative behaviors (e.g., keep condoms available). These preliminary results suggest that this intervention is promising for increasing constructs associated with safer sexual behavior and could easily be implemented by residence hall staff.  相似文献   
999.
An inverse relationship between workplace status and morbidity is well established; higher job status has been associated with reduced risks of heart disease, hypertension, and injury. Most research on job status, however, has focused on salaried populations, and it remains unclear whether job status operates similarly among hourly workers. Our objectives were to examine whether hourly status itself influences risk of hypertension after adjustment for socioeconomic confounders, and to explore the role of fine-scale job grade on hypertension incidence within hourly and salaried groups. We examined data for 14,999 aluminum manufacturing employees in 11 plants across the U.S., using logistic regression with adjustment for age, sex, race/ethnicity and other individual characteristics. Propensity score restriction was used to identify comparable groups of hourly and salaried employees, reducing confounding by sociodemographic characteristics. Job grade (coded 1 through 30, within hourly and salaried groups) was examined as a more refined measure of job status. Hourly status was associated with an increased risk of hypertension, after propensity restriction and adjustment for confounders. The observed effect of hourly status was stronger among women, although the propensity-restricted cohort was disproportionately male (96%). Among salaried workers, higher job grade was not consistently associated with decreased risk; among hourly employees, however, there was a significant trend, with higher job grades more protective against hypertension. Increasing the stringency of hypertension case criteria also increased the risk of severe or persistent hypertension for hourly employees.  相似文献   
1000.
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