全文获取类型
收费全文 | 4813篇 |
免费 | 337篇 |
国内免费 | 50篇 |
专业分类
耳鼻咽喉 | 31篇 |
儿科学 | 149篇 |
妇产科学 | 167篇 |
基础医学 | 227篇 |
口腔科学 | 164篇 |
临床医学 | 616篇 |
内科学 | 1047篇 |
皮肤病学 | 34篇 |
神经病学 | 174篇 |
特种医学 | 106篇 |
外科学 | 473篇 |
综合类 | 639篇 |
一般理论 | 2篇 |
预防医学 | 835篇 |
眼科学 | 32篇 |
药学 | 219篇 |
22篇 | |
中国医学 | 92篇 |
肿瘤学 | 171篇 |
出版年
2024年 | 13篇 |
2023年 | 99篇 |
2022年 | 252篇 |
2021年 | 648篇 |
2020年 | 302篇 |
2019年 | 192篇 |
2018年 | 185篇 |
2017年 | 158篇 |
2016年 | 163篇 |
2015年 | 125篇 |
2014年 | 285篇 |
2013年 | 296篇 |
2012年 | 193篇 |
2011年 | 209篇 |
2010年 | 170篇 |
2009年 | 191篇 |
2008年 | 190篇 |
2007年 | 187篇 |
2006年 | 177篇 |
2005年 | 175篇 |
2004年 | 142篇 |
2003年 | 147篇 |
2002年 | 110篇 |
2001年 | 95篇 |
2000年 | 77篇 |
1999年 | 57篇 |
1998年 | 34篇 |
1997年 | 43篇 |
1996年 | 35篇 |
1995年 | 30篇 |
1994年 | 25篇 |
1993年 | 29篇 |
1992年 | 32篇 |
1991年 | 30篇 |
1990年 | 15篇 |
1989年 | 22篇 |
1988年 | 18篇 |
1987年 | 14篇 |
1986年 | 7篇 |
1985年 | 8篇 |
1984年 | 3篇 |
1982年 | 5篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 3篇 |
排序方式: 共有5200条查询结果,搜索用时 46 毫秒
31.
A significant minority of medical and dental students fail their undergraduate courses. Early warning systems (EWSs) have been developed in some areas of higher education to predict 'at-risk' students at an early remedial stage. An attempt is made to develop an EWS to predict failure in the bacteriology component of the Batchelor of Dental Surgery course at Manchester Dental School. A system based on class tests and previous end-of-year performance is derived which is used to predict those students likely to fail or fall in the bottom 20-25% in their finals examination. The predictors are combined by a simple equal weights method, which is found to have the same predictive power as using multiple regression. Failure was correctly predicted in 60% of cases, at the expense of 71% false alarms. The high number of false alarms reflects the low failure rate rather than the lack of predictive information. The need for effective cross-validation of EWSs is discussed; many previous studies have not been tested on independent data. 相似文献
32.
Summary Silanated slides provide excellent tissue adhesion for routine histology, immunhistochemistry and in situ hybridization of frozen, paraffin embedded material or cell smears. An easy and inexpensive method of treating glass microscope slides with triethoxysilylpropylamine is reported. 相似文献
33.
John T. Pardeck John W. Murphy Karen A. Callaghan 《Early child development and care》1994,97(1):67-72
This article suggests that the United States educational system needs significant changes. The goal of the article is to present a basic educational philosophy that would facilitate this reform. Specifically, education should be viewed as not only a means to an end that teaches basic skills for employment, but also as a process that enhances social development and self-actualization. Recommendations are offered to achieve this important goal. 相似文献
34.
数字化校园构建之理论基础探讨 总被引:3,自引:3,他引:0
从总结数字化建设的实际出发,从建构主义教学理论、教育传播理论和管理科学理论三个方面,较为全面地论述了构建数字化校园的理论基础,并探讨了在数字化校园建设中如何应用理论来指导实际工作. 相似文献
35.
36.
Martin V. Pusic MD George S. Pachev PhD Wendy A. MacDonald MD 《Academic emergency medicine》2007,14(2):138-148
Objectives
To explore medical students' use of computer tutorials embedded in a busy clinical setting; to demonstrate that such tutorials can increase knowledge gain over and above that attributable to the clinical rotation itself.
Methods
Six tutorials were installed on a computer placed in a central area in an emergency department. Each tutorial was made up of between 33 and 85 screens of information that include text, graphics, animations, and questions. They were designed to be brief (10 minutes), focused, interactive, and immediately relevant. The authors evaluated the intervention using quantitative research methods, including usage tracking, surveys of faculty and students, and a randomized pretest-posttest study.
Results
Over 46 weeks, 95 medical students used the tutorials 544 times, for an overall average of 1.7 times a day. The median time spent on completed tutorials was 11 minutes (average [SD], 14 [±12] minutes). Seventy-four students completed the randomized study. They completed 65% of the assigned tutorials, resulting in improved examination scores compared with the control (effect size, 0.39; 95% confidence interval = 0.15 to 0.62). Students were positively disposed to the tutorials, ranking them as "valuable." Fifty-four percent preferred the tutorials to small group teaching sessions with a preceptor. The faculty was also positive about the tutorials, although they did not appear to integrate the tutorials directly into their teaching.
Conclusions
Medical students on rotation in a busy clinical setting can and will use appropriately presented computer tutorials. The tutorials are effective in raising examination scores. 相似文献
To explore medical students' use of computer tutorials embedded in a busy clinical setting; to demonstrate that such tutorials can increase knowledge gain over and above that attributable to the clinical rotation itself.
Methods
Six tutorials were installed on a computer placed in a central area in an emergency department. Each tutorial was made up of between 33 and 85 screens of information that include text, graphics, animations, and questions. They were designed to be brief (10 minutes), focused, interactive, and immediately relevant. The authors evaluated the intervention using quantitative research methods, including usage tracking, surveys of faculty and students, and a randomized pretest-posttest study.
Results
Over 46 weeks, 95 medical students used the tutorials 544 times, for an overall average of 1.7 times a day. The median time spent on completed tutorials was 11 minutes (average [SD], 14 [±12] minutes). Seventy-four students completed the randomized study. They completed 65% of the assigned tutorials, resulting in improved examination scores compared with the control (effect size, 0.39; 95% confidence interval = 0.15 to 0.62). Students were positively disposed to the tutorials, ranking them as "valuable." Fifty-four percent preferred the tutorials to small group teaching sessions with a preceptor. The faculty was also positive about the tutorials, although they did not appear to integrate the tutorials directly into their teaching.
Conclusions
Medical students on rotation in a busy clinical setting can and will use appropriately presented computer tutorials. The tutorials are effective in raising examination scores. 相似文献
37.
An assessment of medical students' psychiatric performance demonstrated no association between the ability to rate psychopathology or to observe interview behaviour and traditional written methods of academic achievement. This is in accordance with those few studies which have addressed this issue and indicates that there may well be at least three independent skills involved in clinical decision-making: the ability to engage in interpersonal interaction and elicit information; and the ability to acquire and use academic knowledge. This is consistent with work suggesting that maturational and learning processes influence clinical reasoning, and demonstrates that each component should be addressed in assessing students in psychiatry. 相似文献
38.
33 patients with advanced refractory multiple myeloma received a combination of vincristine, cyclophosphamide, carmustine, melphalan and steroids (M-2 protocol). 20 of them had failed prior chemotherapy with alkylating agents and the remaining 13 patients had relapsed after a response to these drugs. An objective tumour cell mass reduction (greater than or equal to 50%) was achieved in 17% of the patients (6% of previously nonresponders and 33% of previously relapsing), while 9 additional patients improved (30-50% tumour reduction), for an overall response rate of 47% (39% for previously nonresponders and 58% for previously relapsing). The median duration of response was 7 months. Thrombocytopenia was the most common toxicity encountered in the study (39% of cases). Our findings indicate that M-2 protocol is an effective salvage treatment for patients who relapse from previous chemotherapy with alkylating agents. In contrast, results in patients who are primarily resistant to these drugs justify the search for different treatment programmes which can produce greater degrees of tumour reduction. 相似文献
39.
E. Wallenböck T. Diethart M. Plecko B. Fuchs 《Langenbeck's archives of surgery / Deutsche Gesellschaft fur Chirurgie》1994,379(2):76-79
Zusammenfassung Den Vorteilen einer osteosynthetischen Versorgung einer Fraktur mit sofortiger Aufnahme seiner Funktion, stehen die aus der Literatur bekannten Komplikationen gegenüber. Diese und unsere eigenen unbefriedigenden Ergebnisse nach der operativen Versorgung von Radiusköpfchenfrakturen ließen uns zu einer prospektiven randomisierten Studie einer primär funktionellen Behandlung unter Verzicht auf eine äußere oder innere Stabilisierung greifen. Seit Dezember 1991 haben wir im UKH-Graz bis einschließlich Dezember 1992 insgesamt 70 Patienten nach einem strikten Behandlungskonzept, unter Zuhilfenahme der Computertomographie zur Verlaufsbeobachtung versorgt. Die in 91% der Fälle als sehr gut and gut einzustufenden Frühergebnisse sowie das fehlende Auftreten einer, wie bei operativer Versorgung möglichen Komplikation, ebenso die zusätzlich deutlich frühere Arbeitsfähigkeit bzw. deutlich kürzere, wenn auch aufwendigere Behandlungszeit, lassen uns diese Verfahren nicht nur in unserem Hans weiterführen, sondern können wir auch weiter empfehlen.
Experience with internal fixation of fractures of the head of the radius
The advantages of internal fixation of fractures, with the possibility of immediate resumption of the function of the fractured bone, are in contrast to the well-known complications described in the literature. These complications and our own unsatisfactory results after surgical treatment of fractures of the head of the radius induced us to carry out a randomized prospective study of primary functional treatment of such fractures without external or internal stabilization. From December 1991 through December 1992, a total of 70 patients were treated according to a strict treatment protocol at the Graz Hospital for Accident Surgery, and CT was used for observation of the healing process. The positive early results, which in 91% of all cases were classified as very good or good, the lack of complications that sometimes follow surgical treatment, the markedly earlier recovery of the patient's working capacity, and the clearly shorter — albeit somewhat more expensive — treatment period required have led us to continue using this method at our hospital and also to recommend its use elsewhere.相似文献
40.
Manabu Muto Mitsuhiro Fujishiro Yoshitaka Sato Yasumasa Niwa Mitsuru Kaise Mototsugu Kato Kaiyo Takubo 《Digestive endoscopy》2007,19(Z1):S153-S155
Optical technological innovations enable us to visualize cellular nuclei endoscopically. Herein is described a protocol design for a multicenter study for the ex vivo evaluation of endocytoscopy. The present study was performed by the Endoscopy Forum Japan study group. 相似文献