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   94939篇
  免费   10666篇
  国内免费   4879篇
耳鼻咽喉   1037篇
儿科学   1642篇
妇产科学   950篇
基础医学   6351篇
口腔科学   2977篇
临床医学   12134篇
内科学   10258篇
皮肤病学   1396篇
神经病学   3033篇
特种医学   3803篇
外科学   8609篇
综合类   21558篇
现状与发展   13篇
一般理论   8篇
预防医学   12666篇
眼科学   1156篇
药学   9548篇
  119篇
中国医学   8527篇
肿瘤学   4699篇
  2024年   496篇
  2023年   1528篇
  2022年   2997篇
  2021年   3933篇
  2020年   3513篇
  2019年   2025篇
  2018年   2561篇
  2017年   3009篇
  2016年   2554篇
  2015年   4153篇
  2014年   5153篇
  2013年   6651篇
  2012年   8115篇
  2011年   8584篇
  2010年   7705篇
  2009年   7005篇
  2008年   6802篇
  2007年   6533篇
  2006年   5711篇
  2005年   4485篇
  2004年   3228篇
  2003年   2637篇
  2002年   2136篇
  2001年   2001篇
  2000年   1396篇
  1999年   747篇
  1998年   446篇
  1997年   451篇
  1996年   441篇
  1995年   348篇
  1994年   284篇
  1993年   267篇
  1992年   220篇
  1991年   185篇
  1990年   170篇
  1989年   185篇
  1988年   185篇
  1987年   145篇
  1986年   158篇
  1985年   150篇
  1984年   104篇
  1983年   116篇
  1982年   87篇
  1981年   93篇
  1980年   66篇
  1979年   50篇
  1977年   53篇
  1976年   47篇
  1971年   48篇
  1970年   43篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
Six cases were examined to review the important anaesthetic implications of Larsen's syndrome. Potential problems arising in these patients are highlighted and emphasis placed on cervical spine and airway/respiratory management.  相似文献   
62.
远端蒂筋膜皮瓣内浅静脉干定时放血的临床应用   总被引:3,自引:1,他引:2  
[目的]探讨预防远端蒂筋膜皮瓣静脉危象和提高皮瓣成活质量的方法. [方法]通过于26例大面积下肢皮神经营养血管远端蒂筋膜皮瓣内浅静脉干远心端蒂部结扎,近心端留置静脉留置针外引流,每天6 h定量放血,连续5d,密切观察皮瓣血供及肿胀情况. [结果]26例皮瓣全部成活,无1例出现静脉危象,无明显肿胀期.随访1~2年,皮瓣质地柔软,无明显色素沉着,均恢复保护性感觉. [结论]此方法能预防远端蒂筋膜皮瓣的静脉危象,提高皮瓣的成活质量.  相似文献   
63.
64.
乳腺病变X线立体定位钢丝置入移位的分析   总被引:1,自引:0,他引:1  
目的分析乳腺立体定位下钢丝置入移位的表现、原因、处理方法,提高术前定位的准确性。方法行立体定位置入钢丝患者79例,96个病变,发生钢丝移位13例。结果立体定位中发生钢丝移位5例,原因分别来自于患者和操作医师;立体定位完成后钢丝移位5例,原因是局麻注射药物过多,导致乳腺Z轴的深度与计算机提示的实际深度不符合、放置定位针的方法不正确、拔出钢丝外套针套时疏忽钢丝是否已锚定病变。处理方法:可按照钢丝提示位置向病变方向移位2cm以内进行手术,重新放置第2根钢丝,将双J型钢丝收入针套并取出体外,重新定位。手术中钢丝脱出2例,因术后过分提拉钢丝所致,放射科医师放置钢丝后应向外科医师准确描述深度、方向,并从距离钢丝头端距离皮肤最近处取切口手术。术后标本未见钙化1例,与钙化位于手术电刀破坏的腺体内有关,可扩大范围切除并短期复查,证实钙化是否完整切除。结论正确认识乳腺X线立体定位下钢丝移位的表现,熟练掌握其处理方法,可提高对不可触及的乳腺病变的定位准确性,正确引导外科手术。  相似文献   
65.
Thirty persons with Class II Division 1 subdivision malocclusions, ranging in age from 12 years 8 months to 42 years, underwent computed tomography of the temporomandibular joints. The images obtained from sagittal slices were used to assess the depth of the mandibular fossa, the angulation of the posterior wall of the articular tubercle, the condyle-fossa relationship, and the concentric position of the condyles associated with this malocclusion. Paired Student t tests were applied, and Pearson product moment correlations (r) were determined after measurements on both Class I and Class II sides were obtained. No statistically significant asymmetries were found in the depth of the mandibular fossa, the angulation of the posterior wall of the articular tubercle, or the condyle-fossa relationship. However, a statistically significant (P <.05) anterior positioning of the condyles was observed.  相似文献   
66.
先天性肩胛骨高位症1例   总被引:1,自引:0,他引:1  
马素凤 《医学影像学杂志》2007,17(12):1377-1377
患者男,37岁。因雷管爆炸致全身多发皮肤金属伤入院,胸部X线示:右侧肩胛骨明显抬高,肩胛骨上端平颈6椎体上缘水平,肩胛骨与颈椎间可见骨性条形影,左侧肩胛骨未见明显异常。双侧胸部可见多发点状、不规则形高密度影。诊断:右侧肩胛骨高位伴“肩椎骨”形成;双侧胸部多发异物影,结合病史考虑为多发皮肤内金属影。讨论:先天性肩胛骨高位症又称肩胛骨下降不全,本病是肩胛骨在胚胎发育过程中,由于受到某种因素的影响,如宫内压增高,肩胛带肌肉发育不良,肩胛骨与脊柱之间有异常连接而发生下降障碍所至。单侧发病者多表现为双侧颈肩部不对称,患侧颈…  相似文献   
67.
医院用血液制品HCV污染情况的调查   总被引:1,自引:0,他引:1  
目的调查医院治疗用血液制品HCV污染情况.方法临床治疗所用的血液制品,在输完后留容器之残液备检.采用酶标免疫法(ELISA)检测.对ELISA检测之阳性标本及在阴性标本中随机抽取9份,采用逆转录双PCR方法检测HCV_RNA.结果血浆白蛋白抗_HCV阳性率458%,新鲜血浆阳性率26%.两种方法检测同一标本,ELISA检测阳性的血液制品中,用PCR证实,并非都有病毒复制;而在ELISA检测的阴性标本中,仍旧有较高的PCR阳性检出.结论血液制品存在着HCV污染,抗_HCV对于HCV感染的诊断价值很高.检测血液制品中的抗_HCV,合理使用血液成份,可防止HCV在医院内传播.  相似文献   
68.
The public sector in Britain has been subjected to over a decade of major reform aimed at breaking up public service monopolies, at containing costs while at the same time opening services up to greater consumer choice. Health and social services have not been exempt from this revolution in the organization and management of public sector services. The long-standing policy of care in the community is being subjected to market principles and the introduction of a ‘contract culture’ very similar to the NHS reforms introduced in 1991. This paper reviews the origins of these developments in the doctrines of ‘new public management’, a movement which has proved attractive to policy-makers in many countries. Local authority social services departments have been identified as the lead agency for the development of a mixed economy of care following a review of community care policy by the government's health adviser, Sir Roy Griffiths, and a subsequent white paper. This paper examines the limited empirical evidence available on how managers and providers are meeting the challenge bestowed upon them, and concludes that most authorities are moving ahead cautiously if at all. Only a handful of authorities studied have embraced the reforms with any degree of enthusiasm. The paper concludes with an assessment of the reforms from two perspectives: a pessimistic one and an optimistic one. There are many worrying features of the reforms, not least among these being a lack of clarity over their intended purpose. Tensions and contradictions are plentiful, which places in jeopardy the certainty of the reforms in becoming user led rather than provider driven. A more optimistic scenario is that the changes are leading to a loosening up of services and practices which have often suffered from sclerotic tendencies, paternalism and sometimes complacency. If the reform process is skilfully handled and not rushed and if the ends are clearly established and communicated then users and carers could prove to be the principal beneficiaries.  相似文献   
69.
The development and implementation of effective community support systems are goals of many public mental health authorities who are attempting to shift the focus and dollars for mental health services from inpatient to community care. This article presents the results of a survey which asked 90 community mental health agency case managers to assess the community support and residential needs of over 1400 of their clients. Medication monitoring and therapy were rated high priority needs. Psychosocial treatment, day and vocational activities also ranked high. Survey responses regarding residential services indicated a need for more supported and supervised options.The study reported was a collaborative effort by county and agency staff.  相似文献   
70.
Research shows that clients with automatic thoughts (dysfunctional thinking) often do not think of alternative explanations in relation to negative events. Furthermore, these automatic thoughts are characterized by a broad global, self-evaluative and ambiguous nature that could make disputing (or changing the ways they think) the most difficult part of the therapeutic process. This paper proposes a two-stage practise-based disputing model, guided by research, that aims to 'bring' an automatic thought to a specific, objective, quantifiable and concrete level at which not only is the particular aspect(s) of the automatic thought that causes emotional disturbances finely focused, but the disputing is also likely to be effective and manageable. Furthermore, it will also generate alternative explanations that are helpful in reducing emotional disturbances and in facilitating problem solving approach. In this paper, the authors use a case example to discuss the rationale that underpins the conceptualization of the model and to illustrate the process in which the strategies of the model are effectively used.  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