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   1610467篇
  免费   132239篇
  国内免费   2598篇
耳鼻咽喉   21746篇
儿科学   53140篇
妇产科学   46437篇
基础医学   228866篇
口腔科学   47397篇
临床医学   142041篇
内科学   316376篇
皮肤病学   34187篇
神经病学   130884篇
特种医学   65232篇
外国民族医学   475篇
外科学   244869篇
综合类   39994篇
现状与发展   3篇
一般理论   552篇
预防医学   123914篇
眼科学   36600篇
药学   121818篇
  3篇
中国医学   2979篇
肿瘤学   87791篇
  2018年   14926篇
  2016年   13026篇
  2015年   15166篇
  2014年   20891篇
  2013年   31696篇
  2012年   43026篇
  2011年   45212篇
  2010年   26593篇
  2009年   25525篇
  2008年   43350篇
  2007年   45694篇
  2006年   46450篇
  2005年   45091篇
  2004年   44463篇
  2003年   42541篇
  2002年   41647篇
  2001年   75936篇
  2000年   78568篇
  1999年   66591篇
  1998年   17837篇
  1997年   16400篇
  1996年   16392篇
  1995年   16120篇
  1994年   15145篇
  1993年   14293篇
  1992年   55616篇
  1991年   53930篇
  1990年   52719篇
  1989年   50970篇
  1988年   47329篇
  1987年   46673篇
  1986年   44390篇
  1985年   42980篇
  1984年   32141篇
  1983年   27641篇
  1982年   16215篇
  1981年   14497篇
  1980年   13616篇
  1979年   30580篇
  1978年   21153篇
  1977年   17822篇
  1976年   16740篇
  1975年   17625篇
  1974年   21561篇
  1973年   20729篇
  1972年   18909篇
  1971年   17832篇
  1970年   16357篇
  1969年   15306篇
  1968年   13989篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
Potential for widespread transmission of HIV/AIDS among American Indian (AI) adolescents exists, yet no evidence-based interventions (EBIs) have been adapted and evaluated with this population. Intensive psychoeducation may improve knowledge and decision-making which could potentially translate to reductions in HIV risk behaviors. A peer group randomized controlled comparison of an adapted EBI vs. control was delivered over an eight-day summer basketball camp in one reservation-based tribal community to adolescents ages 13–19. Outcome data were gathered immediately post-camp and at 6 and 12 months follow-up. Self-selected peer groups were randomized to intervention (n = 138) or control (n = 129) conditions for a total sample of 267 participants (56.2% female), mean age 15.1 years (SD = 1.7). Intervention participants had better condom use self-efficacy post-camp (Adjusted Mean Difference [AMD] = ?0.75, p < 0.005) and at 6 (AMD = ?0.44, p < 0.005) and 12 months (AMD = ?0.23, p < 0.05) follow-up. Intervention participants also had higher HIV prevention and transmission knowledge (post-camp: AMD = 0.07, p < 0.01; 6 months: AMD = 0.06, p < 0.01) were more likely to believe condoms prevent sexually transmitted infections (post-camp: RR = 1.41, p < 0.005; 6 months: RR = 1.34, p < 0.05), to talk with an adult about HIV/AIDS (post-camp: RR=1.78, p < 0.005; 6 months: RR = 1.14, p < 0.005), had higher partner negotiation efficacy related to substance use during sex (post-camp: AMD = 0.37, p < 0.01), and were more likely to intend to use a condom (post-camp: RR = 1.39, p < 0.01). The adapted intervention had short- and medium-term impacts on AI adolescent risk for HIV/AIDS, but attenuated at 12 months. Intervention delivery through a community-based camp is feasible and acceptable with strong retention. Additional study is needed to evaluate the adapted intervention's impact on sexual risk behaviors and if booster sessions and parent involvement translate to long-term impacts.  相似文献   
4.
5.
6.
7.
8.
9.
10.
Past research suggests that as many as 50% of onward human immunodeficiency virus (HIV) transmissions occur during acute and recent HIV infection. It is clearly important to develop interventions which focus on this highly infectious stage of HIV infection to prevent further transmission in the risk networks of acutely and recently infected individuals. Project Protect tries to find recently and acutely infected individuals and prevents HIV transmission in their risk networks. Participants are recruited by community health outreach workers at community-based HIV testing sites and drug users' community venues, by coupon referrals and through referrals from AIDS clinics. When a network with acute/recent infection is identified, network members are interviewed about their risky behaviors, network information is collected, and blood is drawn for HIV testing. Participants are also educated and given prevention materials (condoms, syringes, educational materials); HIV-infected participants are referred to AIDS clinics and are assisted with access to care. Community alerts about elevated risk of HIV transmission are distributed within the risk networks of recently infected. Overall, 342 people were recruited to the project and screened for acute/recent HIV infection. Only six index cases of recent infection (2.3% of all people screened) were found through primary screening at voluntary counseling and testing (VCT) sites, but six cases of recent infection were found through contact tracing of these recently infected participants (7% of network members who came to the interview). Combining screening at VCT sites and contact tracing the number of recently infected people we located as compared to VCT screening alone. No adverse events were encountered. These first results provide evidence for the theory behind the intervention, i.e., in the risk networks of recently infected people there are other people with recent HIV infection and they can be successfully located without increasing stigma for project participants.  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