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   3643篇
  免费   196篇
  国内免费   3篇
耳鼻咽喉   42篇
儿科学   81篇
妇产科学   108篇
基础医学   505篇
口腔科学   109篇
临床医学   317篇
内科学   780篇
皮肤病学   61篇
神经病学   281篇
特种医学   164篇
外科学   517篇
综合类   47篇
一般理论   1篇
预防医学   291篇
眼科学   36篇
药学   229篇
中国医学   2篇
肿瘤学   271篇
  2023年   25篇
  2022年   25篇
  2021年   62篇
  2020年   38篇
  2019年   60篇
  2018年   59篇
  2017年   52篇
  2016年   66篇
  2015年   60篇
  2014年   74篇
  2013年   160篇
  2012年   180篇
  2011年   187篇
  2010年   99篇
  2009年   106篇
  2008年   159篇
  2007年   173篇
  2006年   156篇
  2005年   187篇
  2004年   157篇
  2003年   144篇
  2002年   168篇
  2001年   113篇
  2000年   84篇
  1999年   95篇
  1998年   38篇
  1997年   22篇
  1996年   29篇
  1995年   29篇
  1994年   38篇
  1993年   36篇
  1992年   76篇
  1991年   72篇
  1990年   67篇
  1989年   69篇
  1988年   65篇
  1987年   64篇
  1986年   51篇
  1985年   53篇
  1984年   36篇
  1983年   30篇
  1979年   26篇
  1978年   24篇
  1977年   22篇
  1976年   22篇
  1975年   20篇
  1974年   20篇
  1973年   20篇
  1971年   21篇
  1969年   23篇
排序方式: 共有3842条查询结果,搜索用时 0 毫秒
81.
82.
83.

Objective

Patients with somatoform disorders could be vulnerable to stressors and have difficulties coping with stress. The aim was to explore what the patients experience as stressful and how they resolve stress in everyday life.

Methods

A cross-sectional retrospective design using 24 semi-structured individual life history interviews. Data-analysis was based on grounded theory.

Results

A major concern in patients was a longing for existential recognition. This influenced the patients' self-confidence, stress appraisals, symptom perceptions, and coping attitudes. Generally, patients had difficulties with self-confidence and self-recognition of bodily sensations, feelings, vulnerability, and needs, which negatively framed their attempts to obtain recognition in social interactions. Experiences of recognition appeared in three different modalities: 1) “existential misrecognition” covered the experience of being met with distrust and disrespect, 2) “uncertain existential recognition” covered experiences of unclear communication and a perception of not being totally recognized, and 3) “successful existential recognition” covered experiences of total respect and understanding. “Misrecognition” and “uncertain recognition” related to decreased self-confidence, avoidant coping behaviours, increased stress, and symptom appraisal; whereas “successful recognition” related to higher self-confidence, active coping behaviours, decreased stress, and symptom appraisal.

Conclusion

Different modalities of existential recognition influenced self-identity and social identity affecting patients' daily stress and symptom appraisals, self-confidence, self-recognition, and coping attitudes. Clinically it seems crucial to improve the patients' ability to communicate concerns, feelings, and needs in social interactions. Better communicative skills and more active coping could reduce the harm the patients experienced by not being recognized and increase the healing potential of successful recognition.  相似文献   
84.
85.
86.
We wanted to evaluate the cutaneous synthesis of 25OHD and cholecalciferol after one whole-body exposure to ultraviolet radiation type B (UVB) in a randomized setup. Healthy volunteers were randomized to one whole-body exposure in a commercial tanning bed with UVB emission (UVB/UVA ratio 1.8-2.0%) or an identical placebo tanning bed without UVB. The output in the 280-320?nm range was 450?μW/cm(2). Blood samples were analyzed for 25OHD and cholecalciferol at baseline and during 7?days after treatment. We included 20 volunteers, 11 to UVB and 9 to placebo treatment. During the first 6?h, no significant differences in 25OHD between the groups were found. At the end of the study, we found a mean increase of 25OHD in the UVB group of 4.5?nmol/l (SD 7?nmol/l) compared to a decline of -1.2?nmol/l (SD 7?nmol/l) in the placebo group (p?=?0.1). A linear mixed model yielded an increase of 25OHD in the UVB group of 1.0?nmol/l per 24?h (p?相似文献   
87.
88.

Introduction and hypothesis

Owing to the recent upsurge in adverse events reported after mesh-augmented pelvic organ prolapse (POP) repairs, our aim was to determine whether the location and depth of synthetic mesh can be measured postoperatively within the vaginal tissue microstructure using optical coherence tomography (OCT).

Methods

Seventeen patients with prior mesh-augmented repairs were recruited for participation. Patients were included if they had undergone an abdominal sacral colpopexy (ASC) or vaginal repair with mesh. Exclusion criteria were a postoperative period of <6 months, or the finding of mesh exposure on examination. OCT was used to image the vaginal wall at various POP-Q sites. If mesh was visualized, its location and depth was calculated and recorded.

Results

Ten patients underwent ASC and 7 patients had 8 transvaginal mesh repairs. Mesh was visualized in 16 of the 17 patients using OCT. In all ASC patients, mesh was imaged centrally at the posterior apex. In patients with transvaginal mesh in the anterior and/or posterior compartments, the mesh was visualized directly anterior and/or posterior to the apex respectively. Mean depth of the mesh in the ASC, anterior, and posterior groups was 60.9, 146.7, and 125.7 μm respectively. Mesh was visualized within the vaginal epithelial layer in all 16 patients despite the route of placement.

Conclusion

In this pilot study we found that OCT can be used to visualize polypropylene mesh within the vaginal wall following mesh-augmented prolapse repair. Regardless of abdominal versus vaginal placement, the mesh was identified within the vaginal epithelial layer.  相似文献   
89.
90.
ObjectivesThe aim of this report was to evaluate the 5-year clinical performance and survival of zirconia (NobelProcera?) single crowns.MethodsAll patients treated with porcelain-veneered zirconia single crowns in a private practice during the period October 2004 to November 2005 were included. The records were scrutinized for clinical data. Information was available for 162 patients and 205 crowns.ResultsMost crowns (78%) were placed on premolars and molars. Out of the 143 crowns that were followed for 5 years, 126 (88%) did not have any complications. Of those with complications, the most common were: extraction of abutment tooth (7; 3%), loss of retention (15; 7%), need of endodontic treatment (9; 4%) and porcelain veneer fracture (6; 3%). No zirconia cores fractured. In total 19 restorations (9%) were recorded as failures: abutment tooth extraction (7), remake of crown due to lost retention (6), veneer fracture (4), persistent pain (1) and caries (1). The 5-year cumulative survival rate (CSR) was 88.8%.ConclusionsAccording to the present 5-year results zirconia crowns (NobelProcera?) are a promising prosthodontic alternative also in the premolar and molar regions. Out of the 143 crowns followed for 5 years, 126 (88%) did not have any complications. However, 9% of the restorations were judged as failures. Further studies are necessary to evaluate the long-term success.  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