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   22529篇
  免费   3043篇
  国内免费   165篇
耳鼻咽喉   184篇
儿科学   318篇
妇产科学   390篇
基础医学   1379篇
口腔科学   758篇
临床医学   6596篇
内科学   2588篇
皮肤病学   235篇
神经病学   980篇
特种医学   339篇
外国民族医学   5篇
外科学   2814篇
综合类   2081篇
现状与发展   1篇
一般理论   7篇
预防医学   4004篇
眼科学   145篇
药学   1270篇
  23篇
中国医学   318篇
肿瘤学   1302篇
  2024年   105篇
  2023年   702篇
  2022年   689篇
  2021年   1160篇
  2020年   1345篇
  2019年   1408篇
  2018年   1303篇
  2017年   1217篇
  2016年   1023篇
  2015年   1154篇
  2014年   1521篇
  2013年   1757篇
  2012年   1184篇
  2011年   1301篇
  2010年   1133篇
  2009年   1127篇
  2008年   1022篇
  2007年   989篇
  2006年   870篇
  2005年   761篇
  2004年   604篇
  2003年   561篇
  2002年   442篇
  2001年   360篇
  2000年   314篇
  1999年   285篇
  1998年   226篇
  1997年   167篇
  1996年   139篇
  1995年   115篇
  1994年   99篇
  1993年   102篇
  1992年   77篇
  1991年   74篇
  1990年   38篇
  1989年   38篇
  1988年   41篇
  1987年   41篇
  1986年   27篇
  1985年   28篇
  1984年   41篇
  1983年   25篇
  1982年   28篇
  1981年   16篇
  1980年   26篇
  1979年   13篇
  1978年   10篇
  1976年   6篇
  1974年   6篇
  1973年   6篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
超细纤维乳管镜引导下乳管内肿瘤切除术   总被引:8,自引:5,他引:3  
目的探讨超细纤维乳管镜引导下乳管内肿瘤切除术的应用价值。方法对312例乳头溢液进行乳管镜检查,其中乳管内发现肿瘤者行手术治疗。利用乳管镜冷光源的皮肤透照点定象限,乳管扩张器探针定乳管走行方向,亚甲蓝染色定乳管末梢的分布。结果78例导管内发现肿瘤:单发性乳头状瘤68例,乳头状瘤病5例,导管内癌5例。28.2%(22/78)的病灶位于总导管,48.7%(38/78)位于导管Ⅰ级分支,17.9%(14/78)位于Ⅱ级分支,位于Ⅲ级和Ⅳ级分支病灶仅占3.8%(3/78)和1.3%(1/78)。病灶距乳头开口的平均距离为2.5cm(1~5cm)。78例均行手术治疗。术后病理诊断证实:65例乳头状瘤,8例乳头状瘤病,5例为导管内癌。乳管镜诊断符合率:乳头状瘤96%(65/68),乳头状瘤病100%(5/5),导管内癌100%(5/5)。单纯导管切除术65例,区段切除术8例,保乳根治术3例,改良根治术2例。结论通过光、针、色三位一体的方法定位以最小的切除范围达到最准确的切除目的,实现乳管内肿瘤的微创治疗。  相似文献   
62.
目的:为帮助腹腔镜胆囊手术病人掌握健康教育的知识.方法:开展了由腹腔镜手术后的病人向术前病人介绍手术感受.结果:促进术前病人对有关的健康教育知识的掌握,并能延长其术前1d晚的睡眠时间.结论:使病人更好地掌握健康宣教知识,有利于病人的治疗.  相似文献   
63.
In 2000, the University of Bristol Dental School Division of Restorative Dentistry carried out a review of the assessment methods used within the undergraduate programme. Following this review, a number of key recommendations were made and the system of formative assessment within the division was changed. Audits were conducted immediately prior to the introduction of the new system and 2 years after it had been introduced, the results of these audits are presented. There was no change in the number of failed appointments between the initial audit and the second audit. There was a reduction in the number of patients treated by more than one student from 25% to 14% (approximating to 3% if student withdrawal from the course is taken into account). The length of time taken to complete treatment reduced between the two audits with more than half of all patients having their treatment completed within 3 months of their initial examination in the second audit. Ninety-five percent of treatment plans were completed in the second audit compared with only 62% in the first audit. In the second audit, the outstanding 5% of cases were signed off as incomplete for satisfactory reasons by the member of supervisory staff (e.g. patients who had moved away or were discharged due to poor attendance). Student comments were mostly positive, the small number of negative comments related to some students being confused by the paperwork in the new system. The overall process has been an extremely positive experience which has resulted in an assessment system with increased clarity which appears to have reduced the stress levels reported by the undergraduate students on the programme and improved the quality of patient care within restorative dentistry.  相似文献   
64.
Men with erectile problems seen for a comprehensive urology-department-based medical and psychological evaluation were sent questionnaires 2 to 3 years later. A representative sample of 99 (52%) responded. The majority (51%) has taken no action and reported that their sexual function was no better. Patients were more likely to comply with a recommendation for sex therapy than with one for a penile prosthesis. This was related to their attitude towards mental health professionals. These findings suggest the need for more knowledge of patient psychology and expectations.These data were presented in preliminary form at the Tenth Meeting of the International Academy of Sex Research, Cambridge, England, September 1984.  相似文献   
65.
Abstract  Preference utilitarians are concerned to maximize the autonomous choices of individuals; for this reason, they argue that nurses ought to advocate for those patients who desire assistance with ending their lives. This approach prompts us to consider, then, the moral validity of nursing involvement in measures intended to end the lives of patients. In this article, the terms of preference utilitarianism are set out and considered in order to determine whether this approach offers sufficient philosophical support for sanctioning a role for nursing in euthanasia. Ultimately, it is found that preference utilitarianism is lacking in this respect, as well as in its fitness for guiding nursing activity in general. In particular, it is found that nurses are required to exchange a handmaiden relationship with the medical profession for an equally undignified relationship with patients. If nursing involvement in measures intended to end the lives of patients is to find sufficient philosophical support, then we need to look elsewhere.  相似文献   
66.
作者提出了一种膈神经放电信号的计算机分析方法,用以克服该信号手工分析时存在的问题。计算机通过对膈神经放电信号的采集、数字整流与滤波等处理后,可得到放电的包络图,从中能自动测量一些重要参数。动物实验证实程序能较好地执行这些功能。统计学分析表明,人工测量结果与计算机测量结果之间无显著性差异。  相似文献   
67.
The purpose of this study was to assess the impact of an educational intervention on medical students' attitudes toward social and sexual contact with patients by doctors from three medical specialties (general practice, obstetrics/gynaecology and psychiatry). Medical students from two consecutive fifth year classes at one medical school participated in one 3 hour session that included instruction on the standards of the profession that prohibit doctor–patient sexual contact. Students were assigned to either intervention groups or control groups and responded to an anonymous questionnaire (overall response rate 66·8% ; n=141). As many as 14·5% of control group students thought it was (sometimes or usually) appropriate for general practitioners to date their own patients and at least 3% thought it appropriate for members of any of these three medical specialties to engage in sexual contact with their own patients. However, there were no significant differences in attitudes toward hugging, dating or sexual contact with current patients between those who had attended the seminar and the control groups. The session significantly influenced attitudes regarding obstetrician/gynaecologists and psychiatrists hugging and having sexual contact with former patients. These findings are discussed in relation to a need for expansion of such instruction.  相似文献   
68.
Objective To develop and evaluate the effectiveness of a breast cancer prevention decision aid for women aged 50 and older at higher risk of breast cancer. Design Pre‐test–post‐test study using decision aid alone and in combination with counselling. Setting Breast Cancer Risk Assessment Clinic. Participants Twenty‐seven women aged 50–69 with 1.66% or higher 5‐year risk of breast cancer. Intervention Self‐administered breast cancer prevention decision aid. Main outcome measures Acceptability; decisional conflict; knowledge; realistic expectations; choice predisposition; intention to improve life‐style practices; psychological distress; and satisfaction with preparation for consultation. Results The decision aid alone, or in combination with counselling, decreased some dimensions of decisional conflict, increased knowledge (P < 0.01), and created more realistic expectations (P < 0.01). The aid in combination with counselling, significantly reduced decisional conflict (P < 0.01) and psychological distress (P < 0.02), helped the uncertain become certain (P < 0.02), and increased intentions to adopt healthier life‐style practices (P < 0.03). Women rated the aid as acceptable, and both women and practitioners were satisfied with the effect it had on the counselling session. Conclusion The decision aid shows promise as a useful decision support tool. Further research should compare the effect of the decision aid in combination with counselling to counselling alone.  相似文献   
69.
实验利用慢性微电极技术观察了清醒活动四季鹅(产蛋期鹅和休产期鹅)下丘脑细胞自发放电及第Ⅱ脑室注入去甲肾上腺素(NE)对单位放电的影响.结果表明无论是产蛋期鹅还是休产期鹅.其下丘脑放电均以中频为主,但产蛋期鹅高频放电高于休产期鹅.放电有单个连续、束状、组群式等3种形式,无论是产蛋期鹅还是休产期鹅,其下丘脑均以单个连续放电为主,但产蛋期鹅组群式放电高于休产期鹅.第Ⅱ脑室注入NE后,75%的单位放电数增加,25%的单位放电数减少.  相似文献   
70.
Summary The efficiency of cold storage red blood cells (CSRBC) or whole blood at −80 °C used in 27 Rh(D) negative patients during surgical operation was reported. The Rh(D) negative patients received the transfusion of CSRBC or whole blood stored at −80 °C for 180 to 360 days. The changes in the indexes, such as blood TB, DB, K+, Na+, BUN, Cr, urine protein (URPO), UOB, Hb, HCT, serum total protein, relative to hemolytic reaction and blood volume before and after transfusion were observed. The results showed that after transfusion of CSRBC or whole blood 27 cases were negative for urine protein and UOB, and the levels of BUN and Cr were normal (P>0.05). Blood TB, DB, Hb, and HCT were increased, while pH, blood K+ and blood Na+ was normal with the difference being not significant before and after operation (P>0.05). Plasma protein was decreased, but there was no significant difference before and after operation (P>0.05). It was suggested that CSRBC or whole blood at −80 °C could be safely infused to the Rh(D) negative patients without side effects during the surgical operation. YU Zhongqing, male, born in 1957, Technician in Charge  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