全文获取类型
收费全文 | 1313篇 |
免费 | 106篇 |
国内免费 | 14篇 |
专业分类
耳鼻咽喉 | 21篇 |
儿科学 | 68篇 |
妇产科学 | 39篇 |
基础医学 | 132篇 |
口腔科学 | 30篇 |
临床医学 | 136篇 |
内科学 | 218篇 |
皮肤病学 | 20篇 |
神经病学 | 142篇 |
特种医学 | 145篇 |
外科学 | 177篇 |
综合类 | 25篇 |
预防医学 | 120篇 |
眼科学 | 10篇 |
药学 | 81篇 |
肿瘤学 | 69篇 |
出版年
2021年 | 26篇 |
2020年 | 10篇 |
2019年 | 18篇 |
2018年 | 37篇 |
2017年 | 20篇 |
2016年 | 20篇 |
2015年 | 25篇 |
2014年 | 27篇 |
2013年 | 56篇 |
2012年 | 58篇 |
2011年 | 65篇 |
2010年 | 46篇 |
2009年 | 49篇 |
2008年 | 40篇 |
2007年 | 69篇 |
2006年 | 44篇 |
2005年 | 46篇 |
2004年 | 35篇 |
2003年 | 37篇 |
2002年 | 35篇 |
2001年 | 40篇 |
2000年 | 28篇 |
1999年 | 30篇 |
1998年 | 60篇 |
1997年 | 53篇 |
1996年 | 31篇 |
1995年 | 29篇 |
1994年 | 24篇 |
1993年 | 19篇 |
1992年 | 20篇 |
1991年 | 17篇 |
1990年 | 20篇 |
1989年 | 24篇 |
1988年 | 24篇 |
1987年 | 26篇 |
1986年 | 23篇 |
1985年 | 22篇 |
1984年 | 21篇 |
1983年 | 21篇 |
1982年 | 13篇 |
1981年 | 12篇 |
1980年 | 14篇 |
1979年 | 10篇 |
1978年 | 6篇 |
1977年 | 6篇 |
1976年 | 11篇 |
1975年 | 9篇 |
1974年 | 6篇 |
1973年 | 7篇 |
1971年 | 4篇 |
排序方式: 共有1433条查询结果,搜索用时 15 毫秒
1.
Paul H. Lysaker Louanne W. Davis Gary J. Bryson Morris D. Bell 《Schizophrenia Research》2009,107(2-3):186-191
Designed to help persons with schizophrenia to persist and perform better at job placements, the Indianapolis Vocational Intervention Program (IVIP) is a program of cognitive-behavioral group and individual interventions. While its feasibility has been previously demonstrated, it is unknown whether IVIP assists persons to achieve greater levels of participation in vocational rehabilitation and higher levels of job performance. In this study, 100 participants with schizophrenia or schizoaffective disorder were offered a six month job placement and randomized to receive IVIP (n = 50) or support services (n = 50) matched for treatment intensity. Number of hours worked was recorded weekly and job performance was assessed biweekly using the Work Behavior Inventory with raters blind to condition. t-tests revealed that participants in the IVIP group worked a significantly greater number of weeks than those in the support condition. Also, repeated measures ANOVA revealed the IVIP group worked more hours across that 26 week period as well. And with regards to work performance, repeated measures of the 56 participants who worked for at least two-thirds of the intervention revealed that participants in the IVIP group had generally better work performance than those in the support condition. Results suggest a connection between cognitive-behavioral interventions and higher levels of work performance in people with schizophrenia. 相似文献
2.
3.
BACKGROUND: There are obvious advantages to increasing donor retention. However, for reasons of blood safety, certain donors may, in fact, be more desirable to retain than others. “Safe” donors are defined as those who provided a blood donation that was negative on all laboratory screening tests and who subsequently reported no behavioral risks in response to an anonymous survey. This study identifies the most important factors affecting the intention of “safe” donors to provide another donation. STUDY DESIGN AND METHODS: An anonymous survey asking about donation history, sexual history, injecting drug use, and recent donation experience was mailed to 50,162 randomly selected allogeneic donors (including directed donors) who gave blood from April through July or from October through December 1993 at one of the five United States blood centers participating in the Retrovirus Epidemiology Donor Study. Before mailing, questionnaires were coded to designate donors with nonreactive laboratory screening tests at their most recent donation. RESULTS: A total of 34,726 donors (69%) responded, with substantially higher response among repeat donors. According to reported intentions only, the vast majority of “safe” donors indicated a high likelihood of donating again within the next 12 months. Only 3.4 percent reported a low likelihood of donating again. A comparison of those likely to return and those unlikely to return reveals significant differences in demographics and in ratings of the donation experience. A higher proportion of those unlikely to return were first-time donors, minority-group donors, and donors with less education. The highest projected loss among “safe” donors was seen for those who gave a fair to poor assessment of their treatment by blood center staff or of their physical well-being during or after donating. CONCLUSION: These data suggest that efforts to improve donors' perceptions of their donation experience, as well as attention to the physical effects of blood donation, may aid in the retention of both repeat and first-time donors. 相似文献
4.
Edward C. Kohaut John Whelchel F. Bryson Waldo Arnold G. Diethelm 《Pediatric nephrology (Berlin, Germany)》1987,1(2):150-153
Nine infants, who presented with renal failure within the first 3 months of life, were treated with continuous ambulatory peritoneal dialysis (CAPD). Seven infants survived to an age of 12–15 months, when they received transplants. Two patients died while on CAPD. Six infants are alive with a functioning renal allograft, at an average age of 35.5 months and an average of 22 months post-transplant. Neurological development is normal in four of the six infants tested. The mean current height of the six transplant recipients is just below 2 SD from the mean. 相似文献
5.
Rosenberg ZS; Jahss MH; Noto AM; Shereff MJ; Cheung Y; Frey CC; Norman A 《Radiology》1988,167(2):489-493
Computed tomography (CT) was performed in 42 patients with 49 clinically suspected tears of the posterior tibial tendon. Twenty-eight of the 49 suspected tears were subsequently surgically explored and repaired. Three patterns of tendon abnormalities were recognized on CT scans: type I-intact, hypertrophied, heterogeneous tendon; type II-attenuated tendon; and type III-absence of a portion of a tendon. Types I and II correlated with partial rupture seen during surgery, and type III correlated with complete rupture of the tendon. CT findings were accurate in 96% of the patients who underwent surgery. In four cases (14%), tendon rupture was seen on CT scans, but the extent of the injury was underestimated and the rupture was misclassified. Reactive periostitis of the distal tibia was seen in 71% of diseased tendons and may represent an important factor in the diagnosis of tendon rupture. 相似文献
6.
Obstetrical suboptimality in autistic children 总被引:8,自引:0,他引:8
7.
8.
Intestinal schistosomiasis japonica: CT-pathologic correlation 总被引:1,自引:0,他引:1
Lee RC; Chiang JH; Chou YH; Rubesin SE; Wu HP; Jeng WC; Hsu CC; Tiu CM; Chang T 《Radiology》1994,193(2):539
9.
10.