全文获取类型
收费全文 | 23374篇 |
免费 | 1812篇 |
国内免费 | 789篇 |
专业分类
耳鼻咽喉 | 259篇 |
儿科学 | 304篇 |
妇产科学 | 195篇 |
基础医学 | 3078篇 |
口腔科学 | 459篇 |
临床医学 | 2327篇 |
内科学 | 1610篇 |
皮肤病学 | 289篇 |
神经病学 | 2587篇 |
特种医学 | 1222篇 |
外科学 | 1102篇 |
综合类 | 3173篇 |
一般理论 | 5篇 |
预防医学 | 4082篇 |
眼科学 | 559篇 |
药学 | 1859篇 |
37篇 | |
中国医学 | 2304篇 |
肿瘤学 | 524篇 |
出版年
2024年 | 84篇 |
2023年 | 351篇 |
2022年 | 617篇 |
2021年 | 862篇 |
2020年 | 770篇 |
2019年 | 724篇 |
2018年 | 670篇 |
2017年 | 796篇 |
2016年 | 856篇 |
2015年 | 823篇 |
2014年 | 1273篇 |
2013年 | 1838篇 |
2012年 | 1285篇 |
2011年 | 1440篇 |
2010年 | 1084篇 |
2009年 | 1050篇 |
2008年 | 1183篇 |
2007年 | 1165篇 |
2006年 | 1051篇 |
2005年 | 882篇 |
2004年 | 788篇 |
2003年 | 686篇 |
2002年 | 617篇 |
2001年 | 518篇 |
2000年 | 442篇 |
1999年 | 411篇 |
1998年 | 357篇 |
1997年 | 324篇 |
1996年 | 275篇 |
1995年 | 295篇 |
1994年 | 278篇 |
1993年 | 238篇 |
1992年 | 209篇 |
1991年 | 229篇 |
1990年 | 163篇 |
1989年 | 182篇 |
1988年 | 141篇 |
1987年 | 123篇 |
1986年 | 137篇 |
1985年 | 107篇 |
1984年 | 104篇 |
1983年 | 94篇 |
1982年 | 94篇 |
1981年 | 73篇 |
1980年 | 72篇 |
1979年 | 64篇 |
1978年 | 34篇 |
1977年 | 27篇 |
1976年 | 31篇 |
1975年 | 17篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
161.
Seventy-three men and 72 women made lexical decisions to target words that followed sentences constructed so that the last word was a sexual double-entendre. Prime target relatedness, erotic versus nonerotic target, stimulus onset asynchrony, and participant's gender were varied in a between-subjects design. A second analysis that substituted sentence context for prime target relationship also was conducted. Data were collected on the emotionality and social acceptability of priming sentences and target words. Results revealed that, as with previous research on neutral words, prime target relatedness facilitated lexical decisions. Additionally, there was evidence of slowing in making lexical decisions when erotic material was presented or was part of a contextual bias. This delay was accentuated in women. A model that proposes that sexual words evoke a more complex processing sequence is presented. The model suggests that appraisal and checking or editing mechanisms, which are accentuated in women, help explain the phenomenon.
Portions of this work was submitted by the junior author in partial fulfillment of the requirements for Honors in Psychology at Louisiana State University 相似文献
162.
本文比较了11例眼球异物CT与X线影像,并经手术摘出异物证实,CT眼球异物检出及定位准确性均优于X线,尤其对球壁异物的定位,而且能显示断层眼球壁轮廓,具有直观效果,CT异物影像比异物明显扩大,应警惕CT伪影可能使球壁异物定位发生误差,CT目前尚不能完全取代眼球异物常规X线检查。 相似文献
163.
L. Salleras M. Bruguera J. Vidal J. L. Taberner P. Plans J. M. Bayas T. Pumarola M. T. Jimenez de Anta J. Rodes 《European journal of epidemiology》1992,8(5):640-644
The prevalence of hepatitis B markers was determined in a representative sample of the general population of Catalonia (Spain). HBsAg was found in 0.5% of children (less than 15 years of age) and in 1.7% of adults (more than 15 years of age), and anti HBs in 1.6% and 18%, respecitvely. Age-specific prevalence for both markers showed a low risk for hepatitis B before puberty, and a progressive rise since adolescence, suggesting that perinatal transmission and horizontal transmission in children are relatively uncommon in Spain. Prevalence of hepatitis B markers was significantly higher among subjects with low education level, residing in an urban area and born outside Catalonia, but in the stratified analysis, a statistical significant difference was only maintained in the prevalence of HBV markers between those who live in urban and rural areas, and between those who were born outside Catalonia and in Catalonia. These data may be used as a basis for a strategy of hepatitis B prevention in Spain which include universal vaccination of adolescents, passive-active immunization of newborns to HBsAg positive mothers and vaccination of susceptible adults subjects from high-risk groups.Preventive Medicine Unit.Liver Unit.Corresponding author. 相似文献
164.
This study investigated preferential encoding of threat material in subjects with posttraumatic stress disorder (PTSD) with a modified dot-probe paradigm. This paradigm indexes attentional bias by measuring response latency to name neutral target words that are presented adjacent to or distant from threat words. Motor vehicle accident survivors with PTSD (n = 15), subclinical PTSD (n = 15), and low anxiety (n = 15) were required to name target words that were presented either adjacent to or distant from strong threat, mild threat, positive, and neutral words. PTSD subjects named targets faster when they were in close proximity to mild threat words. Results suggested that PTSD subjects' attention was drawn to the mild threat stimuli and are discussed in the context of network models of PTSD. 相似文献
165.
Pemberton手术为主多种辅助手段治疗大龄儿童先天性髋脱位 总被引:3,自引:1,他引:2
目的 应用Pemberton手术为主多种辅助手段治疗大龄儿童先天性髋脱位 ,从而降低术后髋关节脱位、僵硬和股骨头坏死发生率。方法 自 1989年 8月 - 1999年 8月 ,用Pemberton手术为主多种辅助手段治疗大龄儿童 (7~ 14岁 )先天性髋脱位 4 6例 (5 8髋 ) ,随访 2~ 9年 ,平均 5年 3个月。辅助手段包括 :①髂腰肌及内收肌切断 ,股骨髁上骨牵引 ;②股骨粗隆下旋转加短缩截骨 ;③单髋人字石膏制动 ;④髋关节早活动 ,晚负重 ;⑤术后被动活动髋关节加主动功能锻炼。结果 髋关节完全复位率10 0 % ,髋关节屈曲小于 90°者 4髋 ,占 6 9% ,按Salter提出的股骨头坏死诊断标准 4 6例 (5 8髋 )中 ,股骨头坏死 6髋 ,占 10 3% ,明显降低了大龄儿童先天性髋脱位术后髋关节僵硬、股骨头坏死率。结论 Pemberton手术为主多种辅助手段治疗大龄儿童先天性髋脱位疗效确切 ,优良率高。 相似文献
166.
Douglas N. Johnson Herbert J. Weingartner Paul Andreason David T. George 《Psychopharmacology》1995,121(2):145-149
This study explored whether benzodiazepines selectively affect aspects of attention and/or visual information processing, as they do memory. A cued visual-search paradigm was employed, using normal volunteers and a single dose of triazolam. This paradigm provided for a detailed examination of two aspects of visual attention and information processing: 1) controlled versus automatic attention allocation (via central and peripheral cues), and 2) the extent to which processing an item in a non-cued location affects performance (via cue-validity). Triazolam, compared to placebo, significantly increased response time, and Drug Condition interacted with Cue-Validity but not Cue-Type. Based on these data, we argue that triazolam doesnot affect attention allocation butdoes affect attentional disengagement and/or attention switching mechanisms. 相似文献
167.
This paper describes the efforts of the Department of Family and Community Health at Sultan Qaboos University in providing opportunities for the development of 'hands-on' problem-solving skills appropriate for Oman. The curriculum of the Department is discussed, highlighting the unusual emphasis of this discipline in both the preclinical and clinical curriculum of the College of Medicine. The importance of continuous assessment and supervision of students is discussed. Course-work in the preclinical curriculum of the Department is kept to a minimum. Field-work forms an important part of preclinical training, where application and problem-based learning are emphasized. During the clinical years the students are exposed to an integrated series of lectures and practicals covering core knowledge in clinical medicine. Practical clinical training, over a total period of 15 weeks, takes place at a variety of sites where common problems in primary health care in Oman are handled by students under supervision. 相似文献
168.
Remodeling Adult Nursing 总被引:1,自引:0,他引:1
This article describes a nursing education experience in which a critical thinking approach was planned and implemented. Background discussion on critical thinking concepts and related research provides a foundation for presentation of the Mackie teaching model. The model uses a community-based, family-centered scenario as the basis for developing problemfocused nursing intervention skills from a holistic viewpoint. Role expectations of students and faculty are outlined, and related implementation difficulties, together with their resolution strategies, are described. Evaluation methods and outcomes are reviewed in the conclusion. 相似文献
169.
170.
目的:探讨喉部CT仿真内窥镜(CT virtual endoscopy,CTVE)的成像质量及其影响因素。方法:对84例喉部螺旋CT扫描者行CTVE成像,根据喉腔内部结构、病灶、黏膜皱襞的显示情况和有无伪影将CTVE图像分为3级,分别比较CTVE技术在不同的扫描层厚、重建层厚及阈值的情况下图像质量的优劣。结果:CT原始扫描层厚为2mm、3mm分别与5mm、8mm的CTVE图像质量相比较,有显著性差异(P<0.05);重建层厚为2mm、3mm与5mm相比较,均有显著性差异(P<0.05);阈值为 -800— -600HU与阈值为-300HU相比较,有显著性差异(P<0.05)。结论:不同的CT原始扫描层厚、重建层厚及阈值对CTVE图像的质量影响有明显差异。选用合适的原始扫描参数及重建参数,可以提高CTVE图像的质量,对喉部疾病的诊断很有帮助。 相似文献