全文获取类型
收费全文 | 21052篇 |
免费 | 960篇 |
国内免费 | 69篇 |
专业分类
耳鼻咽喉 | 349篇 |
儿科学 | 632篇 |
妇产科学 | 507篇 |
基础医学 | 3091篇 |
口腔科学 | 384篇 |
临床医学 | 1964篇 |
内科学 | 4389篇 |
皮肤病学 | 620篇 |
神经病学 | 2263篇 |
特种医学 | 1355篇 |
外国民族医学 | 3篇 |
外科学 | 2714篇 |
综合类 | 187篇 |
一般理论 | 6篇 |
预防医学 | 833篇 |
眼科学 | 575篇 |
药学 | 1275篇 |
中国医学 | 30篇 |
肿瘤学 | 904篇 |
出版年
2022年 | 161篇 |
2021年 | 285篇 |
2020年 | 200篇 |
2019年 | 272篇 |
2018年 | 340篇 |
2017年 | 288篇 |
2016年 | 341篇 |
2015年 | 409篇 |
2014年 | 545篇 |
2013年 | 813篇 |
2012年 | 1095篇 |
2011年 | 1072篇 |
2010年 | 666篇 |
2009年 | 635篇 |
2008年 | 1019篇 |
2007年 | 1141篇 |
2006年 | 1093篇 |
2005年 | 1046篇 |
2004年 | 999篇 |
2003年 | 1011篇 |
2002年 | 935篇 |
2001年 | 371篇 |
2000年 | 281篇 |
1999年 | 294篇 |
1998年 | 211篇 |
1997年 | 200篇 |
1996年 | 166篇 |
1995年 | 160篇 |
1994年 | 165篇 |
1993年 | 139篇 |
1992年 | 228篇 |
1991年 | 217篇 |
1990年 | 210篇 |
1989年 | 196篇 |
1988年 | 200篇 |
1987年 | 219篇 |
1986年 | 218篇 |
1985年 | 173篇 |
1984年 | 158篇 |
1983年 | 177篇 |
1982年 | 125篇 |
1981年 | 117篇 |
1980年 | 110篇 |
1979年 | 127篇 |
1978年 | 119篇 |
1977年 | 86篇 |
1974年 | 99篇 |
1973年 | 79篇 |
1933年 | 93篇 |
1931年 | 82篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Trevor J. Durbin Casper G. Bendixsen Danielle Jensen-Ryan Abigaile Molzer Sarah Strauss 《Journal of agromedicine》2019,24(2):157-166
ABSTRACTForest workers, including loggers, foresters, and wildland firefighters, are regularly exposed to some of the most fatal occupational environments in the United States. These hazardous work environments may become even more complex and dynamic when subject to bark beetle outbreaks that have resulted in significant tree mortality. The impacts of tree death from bark beetles are significant, with the cumulative 17-year (2000–2016) footprint for bark beetle caused tree mortality estimated at 54 million acres. However, how workers think about and act in these environments is understudied. This study, therefore, approaches the issue of beetle kill and forest worker safety by examining the perspectives or workers themselves. Its contribution is to leverage ethnographic research to provide insights that can generate new research questions, better inform outreach, and ultimately improve worker safety outcomes. The resulting insights show that beetle kill was understood by workers as a hazard that increased the complexity and dynamism of the work environment, making situational awareness both more necessary and more difficult to maintain. While much research about situational awareness focuses on hazardous situations, it is suggested that building adequate situational awareness should also include broader considerations of organizational communication, as well as training and experience considered over the course of entire careers. 相似文献
2.
Amy Y. Zhang Christopher Burant Alex Z. Fu Gerald Strauss Donald R. Bodner Lee Ponsky 《Journal of psychosocial oncology》2020,38(2):210-227
AbstractPurpose: We examined underlying psychosocial processes of a behavioral treatment for urinary incontinence (UI) of prostate cancer survivors.Design: Secondary analysis of data collected from a clinical trial.Sample: Two hundred forty-four prostate cancer survivors who participated in a clinical trial of behavioral intervention to UI as intervention or control subjects.Methods: The participants had a 3-month behavioral intervention or usual care and were followed up for an additional 3?months. They were assessed at baseline, 3, and 6?months. Latent growth curve models were performed to examine trajectories of each study variable and relationships among the variables.Findings: Increasing self-efficacy and social support were significantly and independently associated with more reduction of urinary leakage frequency over time.Implications for psychosocial oncology: Providing problem-solving skills and social support, including peer support, are essential for empowering patients to reduce UI. 相似文献
3.
4.
5.
6.
7.
U. Bolm-Audorff S. Brandenburg T. Brüning H. Dupuis R. Ellegast G. Elsner K. Franz H. Grasshoff V. Grosser L. Hanisch B. Hartmann E. Hartung K. G. Hering G. Heuchert M. Jäger J. Krämer Dr. A. Kranig E. Ludolph A. Luttmann A. Nienhaus W. Pieper K.-D. Pöhl T. Remé D. Riede G. Rompe K. Schäfer S. Schilling E. Schmitt F. Schröter A. Seidler M. Spallek M. Weber 《Trauma und Berufskrankheit》2005,7(3):211-252
Occupational diseases Nos. 2108 and 2110 correspond to intervertebral disc-related diseases of the lumbar spine from many years of carrying or lifting heavy loads, occupations in extreme postures of full flexion or oscillation of the whole body when seated, and which compel the cessation of all activities which are or could be the cause for the origin, exacerbation or recurrence of the disease. These occupational diseases came into force at the start of 1993, but there have been considerable problems in their implementation. The present Part I of the contribution is the result of the work of an interdisciplinary study group and contains medical criteria for the assessment of possibly strain-related clinical characteristics and the evaluation of other possible causes. Part II is to be published in Volume 4/2005 and will deal with questions related to forced cessation and to the assessment of the loss of earning ability. Agreement was reached in many areas related to the assessment of occupational claims. This should allow for evidence-based decision making in the future for the occupational diseases Nos. 2108 and 2110. 相似文献
8.
Simultaneous angiographic late stent thrombosis in two different coronary vessels after withdrawal of the combined anti-platelet therapy 总被引:2,自引:2,他引:0
9.
10.
Age determines memory for face identity and expression 总被引:1,自引:1,他引:0
Egemen SAVASKAN Sandra Elisabeth MÜLLER reas BÖHRINGER Christine PHILIPPSEN Franz MÜLLER-SPAHN Hartmut SCHÄCHINGER 《Psychogeriatrics》2007,7(2):49-57
Background: The recognition of facial expressions is an important component of emotion processing which contributes to interactional behavior. One of the factors highly associated with potential decline of ability in behavioral tasks is age. Methods: We have investigated age‐related changes in facial identity and expression memory of healthy subjects in three age groups: young adults (20–40 years), elderly adults (60–80 years) and, for the first time in the literature, very old adults (over 80 years of age). Using a picture test, photographs of faces with happy or angry expressions were presented to study participants during the encoding task, and the memory for identity and emotional facial expression was investigated in a subsequent recognition task showing emotionally neutral faces. Half of the faces presented in the recognition task were initially shown in the encoding task. Results: Age interacted with the memory process: the ability to recognize both facial identity and emotional expression declined with advanced age. Happy facial expressions were better recognized in all age groups. Although there was a continuous overall decrease in recognition of both happy and angry expressions with advanced age, the effect favoring happy facial expressions was stable also in very old adults. Other factors such as gender or educational level did not affect the memory process for facial expressions. Conclusions: Our findings suggest that age is a significant determinant of memory for facial identity and emotional expression, and that, similar to younger adults, the recognition process of the elderly favors happy emotional facial expressions. 相似文献