全文获取类型
收费全文 | 826篇 |
免费 | 37篇 |
国内免费 | 6篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 16篇 |
妇产科学 | 12篇 |
基础医学 | 94篇 |
口腔科学 | 13篇 |
临床医学 | 70篇 |
内科学 | 93篇 |
皮肤病学 | 21篇 |
神经病学 | 35篇 |
特种医学 | 257篇 |
外科学 | 98篇 |
综合类 | 3篇 |
预防医学 | 29篇 |
眼科学 | 17篇 |
药学 | 67篇 |
肿瘤学 | 37篇 |
出版年
2021年 | 9篇 |
2018年 | 8篇 |
2014年 | 7篇 |
2013年 | 9篇 |
2012年 | 18篇 |
2011年 | 11篇 |
2010年 | 14篇 |
2009年 | 13篇 |
2008年 | 17篇 |
2007年 | 29篇 |
2006年 | 18篇 |
2005年 | 22篇 |
2004年 | 20篇 |
2003年 | 16篇 |
2002年 | 17篇 |
2001年 | 17篇 |
2000年 | 10篇 |
1999年 | 17篇 |
1998年 | 24篇 |
1997年 | 30篇 |
1996年 | 20篇 |
1995年 | 14篇 |
1994年 | 32篇 |
1993年 | 25篇 |
1992年 | 16篇 |
1991年 | 10篇 |
1990年 | 18篇 |
1989年 | 25篇 |
1988年 | 28篇 |
1987年 | 30篇 |
1986年 | 30篇 |
1985年 | 27篇 |
1984年 | 32篇 |
1983年 | 19篇 |
1982年 | 16篇 |
1981年 | 21篇 |
1980年 | 18篇 |
1979年 | 8篇 |
1978年 | 14篇 |
1977年 | 8篇 |
1976年 | 8篇 |
1975年 | 6篇 |
1972年 | 8篇 |
1971年 | 5篇 |
1970年 | 5篇 |
1969年 | 11篇 |
1968年 | 5篇 |
1967年 | 8篇 |
1965年 | 4篇 |
1929年 | 5篇 |
排序方式: 共有869条查询结果,搜索用时 0 毫秒
31.
32.
H. A. Thies 《Langenbeck's archives of surgery / Deutsche Gesellschaft fur Chirurgie》1969,325(1):1213-1215
Ohne Zusammenfassung 相似文献
33.
34.
35.
Relatively few studies have examined how uneven surfaces affect human gait. To study this, along with the effects of advancing age and low light conditions, we measured step width and step time variability, as well as comfortable gait speed, in 12 healthy young women (YW) and 12 healthy older women (OW) as they walked at a comfortable speed along a 10-m walkway. Ten trials were completed for each cell of a 2 x 2 factorial design: (1) flat surface with regular lighting; (2) flat surface with low lighting; (3) irregular surface with regular lighting; and (4) irregular surface with low lighting. Effects of surface type, incident lighting, and age on gait parameters were tested via repeated measures ANOVA. Surface type significantly affected step width variability (P < 0.001) and step time variability (P < 0.001). Light level showed no significant effect on any of the gait parameters. One significant age group difference was found: step width variability was significantly greater in OW than YW (P = 0.010). We conclude that the irregular surface had a greater effect on the gait variability of healthy OW than on that of healthy YW. 相似文献
36.
Patients with peripheral neuropathy (PN) report greater difficulty walking on irregular surfaces with low light (IL) than on flat surfaces with regular lighting (FR). We tested the primary hypothesis that older PN patients would demonstrate greater step width and step width variability under IL conditions than under FR conditions. Forty-two subjects (22 male, 20 female: mean +/- S.D.: 64.7 +/- 9.8 years) with PN underwent history, physical examination, and electrodiagnostic testing. Subjects were asked to walk 10 m at a comfortable speed while kinematic and force data were measured at 100 Hz using optoelectronic markers and foot switches. Ten trials were conducted under both IL and FR conditions. Step width, time, length, and speed were calculated with a MATLAB algorithm, with the standard deviation serving as the measure of variability. The results showed that under IL, as compared to FR, conditions subjects demonstrated greater step width (197.1 +/- 40.8 mm versus 180.5 +/- 32.4 mm; P < 0.001) and step width variability (40.4 +/- 9.0 mm versus 34.5 +/- 8.4 mm; P < 0.001), step time and its variability (P < 0.001 and P = 0.003, respectively), and step length variability (P < 0.001). Average step length and gait speed decreased under IL conditions (P < 0.001 for both). Step width variability and step time variability correlated best under IL conditions with a clinical measure of PN severity and fall history, respectively. We conclude that IL conditions cause PN patients to increase the variability of their step width and other gait parameters. 相似文献
37.
38.
E. Müller H. A. Thies P. Matis 《Langenbeck's archives of surgery / Deutsche Gesellschaft fur Chirurgie》1969,325(1):1216-1216
Ohne Zusammenfassung 相似文献
39.
40.