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   31181篇
  免费   5738篇
  国内免费   155篇
耳鼻咽喉   131篇
儿科学   497篇
妇产科学   385篇
基础医学   1460篇
口腔科学   685篇
临床医学   7035篇
内科学   2273篇
皮肤病学   184篇
神经病学   1229篇
特种医学   345篇
外国民族医学   1篇
外科学   3831篇
综合类   4119篇
一般理论   23篇
预防医学   7805篇
眼科学   176篇
药学   2443篇
  65篇
中国医学   3517篇
肿瘤学   870篇
  2024年   23篇
  2023年   976篇
  2022年   1115篇
  2021年   1776篇
  2020年   2211篇
  2019年   1824篇
  2018年   1631篇
  2017年   1805篇
  2016年   1613篇
  2015年   1492篇
  2014年   2456篇
  2013年   3038篇
  2012年   2094篇
  2011年   2282篇
  2010年   1715篇
  2009年   1506篇
  2008年   1522篇
  2007年   1426篇
  2006年   1269篇
  2005年   905篇
  2004年   758篇
  2003年   735篇
  2002年   496篇
  2001年   458篇
  2000年   408篇
  1999年   267篇
  1998年   224篇
  1997年   207篇
  1996年   150篇
  1995年   134篇
  1994年   97篇
  1993年   81篇
  1992年   55篇
  1991年   46篇
  1990年   60篇
  1989年   39篇
  1988年   34篇
  1987年   23篇
  1986年   22篇
  1985年   22篇
  1984年   10篇
  1983年   7篇
  1982年   12篇
  1981年   6篇
  1980年   10篇
  1979年   7篇
  1978年   4篇
  1976年   3篇
  1975年   4篇
  1974年   10篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
We conducted an operational research study involving backyard and semicommercial farms on Java Island, Indonesia, between April 2008 and September 2009 to evaluate the effectiveness of two preventive mass vaccination strategies against highly pathogenic avian influenza (HPAI). One regimen used Legok 2003 H5N1 vaccine, while the other used both Legok 2003 H5N1 and HB1 Newcastle disease (ND) vaccine. A total of 16 districts were involved in the study. The sample size was estimated using a formal power calculation technique that assumed a detectable effect of treatment as a 50% reduction in the baseline number of HPAI‐compatible outbreaks. Within each district, candidate treatment blocks with village poultry populations ranging from 80 000 to 120 000 were created along subdistrict boundary lines. Subsequently, four of these blocks were randomly selected and assigned one treatment from a list that comprised control, vaccination against HPAI, vaccination against HPAI + ND. Four rounds of vaccination were administered at quarterly intervals beginning in July 2008. A vaccination campaign involved vaccinating 100 000 birds in a treatment block, followed by another 100 000 vaccinations 3 weeks later as a booster dose. Data on disease incidence and vaccination coverage were also collected at quarterly intervals using participatory epidemiological techniques. Compared with the unvaccinated (control) group, the incidence of HPAI‐compatible events declined by 32% (P = 0.24) in the HPAI‐vaccinated group and by 73% (P = 0.00) in the HPAI‐ and ND‐vaccinated group. The effect of treatment did not vary with time or district. Similarly, an analysis of secondary data from the participatory disease and response (PDSR) database revealed that the incidence of HPAI declined by 12% in the HPAI‐vaccinated group and by 24% in the HPAI + ND‐vaccinated group. The results suggest that the HPAI + ND vaccination significantly reduced the incidence of HPAI‐compatible events in mixed populations of semicommercial and backyard poultry.  相似文献   
2.
目的探索经痛平胶囊治疗原发性痛经寒凝血瘀证的临床疗效。方法本研究采用随机、双盲、安慰剂对照、多中心、优效性检验的方法。239例患者进入全数据分析集(FAS),治疗组120例,对照组119例。217例进入符合方案数据集,治疗组112例,对照组105例。治疗组服用经痛平胶囊,对照组服用经痛平胶囊模拟剂,3粒/次,3次/d。于每次月经来潮前(6±1)d开始服药,连续服用至此次月经来潮结束。两组均连续治疗3个月经周期。观察两组患者的痛经综合疗效、中医证候疗效,同时比较两组NRS-11评分和痛经持续时间。结果 FAS中对照组、治疗组的综合疗效总有效率分别为26.89%、80.83%;PPS中两组总有效率分别为26.67%、83.93%,FAS和PPS中两组总有效率比较差异均有统计学意义(P0.05)。两组FAS中医证候疗效总有效率分别为48.74%、84.17%;PPS中分别为51.43%、87.50%,两组比较差异均具有统计学意义(P0.05)。治疗组NRS-11评分、痛经持续时间均小于对照组,两组比较差异均有统计学意义(P0.05)。结论经痛平胶囊治疗原发性痛经具有较好的临床疗效,其综合疗效、中医证候疗效均显著优于对照组,能有效缓解痛经疼痛程度、减少痛经持续时间,有进一步开展Ⅲ期临床试验进行疗效确证的价值。  相似文献   
3.
4.
5.
6.
7.
The Australian Youth Cancer Service (YCS) is part of a growing international movement to provide advocacy and better targeted health‐care services for adolescents and young adults (AYAs) with cancer. One of the key initiatives of the YCS is to determine and implement priorities within Australian AYA cancer research. The YCS used the value‐weighting online survey technique of allocating 100 hypothetical units of funding across pre‐determined topics of research in order to determine Australian consumers' and health professionals' AYA cancer research priorities. A total of 101 participants (26 consumers and 75 health professionals) took part in the online survey. Biomedical and Clinical Medicine Research was allocated the greatest proportion of available funding. A number of priority populations were also identified, although these were distributed across pre‐treatment and post‐treatment stages. The preferences of consumers and health professionals to invest available AYA cancer research funds in Biomedical and Clinical Medicine Research will be an important consideration in guiding the Australian YCS decision‐making process in the immediate future. ‘Prevention, screening and early detection’ was also an important research funding target, along with survivorship populations.  相似文献   
8.
Prostate cancer impacts on the daily lives of men, particularly their physical and emotional health, relationships and social life. This paper highlights how men cope with disease and treatment and the strategies they employ to manage their diagnosis alongside daily life. Twenty‐seven men were interviewed at different stages in their disease pathway: nine men prior to radiotherapy, eight men at 6–8 months post radiotherapy and 10 men at 12–18 months post radiotherapy. A grounded theory approach was used to collect and analyse the data. Regardless of the point at which they were interviewed four areas emerged as important to the men: the pathway to diagnosis; the diagnosis; the impact of prostate cancer and its treatment on daily life; and living with prostate cancer. Prostate cancer was diagnosed using the prostate‐specific antigen (PSA) test, rectal examination and biopsy. Many men did not understand the consequences of a high PSA reading before they undertook the test. Painful investigative biopsies were viewed as the worst part of the disease experience. Radiotherapy was considered less invasive than other treatments, although preparatory regimes were associated with stress and inconvenience. Men used various strategies to deal with treatment‐induced threats to their masculinity in the long term.  相似文献   
9.
Today adolescents are highly engaged online. Contrary to common concern, not all highly engaged adolescents develop maladaptive patterns of internet use. The present qualitative study explored the experiences, patterns and impact of use of 124 adolescents (Mage = 16.0) reporting signs of internet addictive behaviors. The focus was to discern adaptive and maladaptive use patterns, which promote or interfere with adolescents' development, respectively. Semi-structured individual interviews were conducted in seven European countries (Greece, Spain, Poland, Germany, Romania, Netherlands and Iceland) and qualitatively analyzed using grounded theory. Considerable variability emerged in the way adolescents satisfied their personal needs online and offline, in the experienced impact from high online engagement and functional value ascribed to the internet, and in the self-regulatory processes underlying use. Variability in these discriminating processes was linked to adaptive or maladaptive adolescent internet use patterns. The emerged processes can provide direction for designing prevention and intervention programs promoting adaptive use.  相似文献   
10.
Medically unexplained symptoms (MUS) are common among adolescents and an important cause of clinical visits. This study sought to understand the experiences with, and perceptions of, the healthcare of adolescents who have MUS and their parents. Using a qualitative approach, six focus groups and two individual interviews were conducted with a total of ten adolescents and sixteen parents. The participants were recruited in a university hospital in Switzerland. A thematic analysis was conducted in accordance with the Grounded Theory. Six main themes emerged: needing a label for the symptoms, seeking an etiology to explain the symptoms, negotiating the medical system, medication and treatments, interactions with doctors, and the inclusion of parents during consultations. Transcending these themes, however, was the need for good communication between the adolescents, their parents and the clinicians. When explaining the symptoms, clinicians should make sure to discuss the results, investigations and lack of organic origin.  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