全文获取类型
收费全文 | 83143篇 |
免费 | 8110篇 |
国内免费 | 429篇 |
专业分类
耳鼻咽喉 | 266篇 |
儿科学 | 2723篇 |
妇产科学 | 2046篇 |
基础医学 | 3651篇 |
口腔科学 | 1710篇 |
临床医学 | 25701篇 |
内科学 | 10311篇 |
皮肤病学 | 709篇 |
神经病学 | 3316篇 |
特种医学 | 735篇 |
外科学 | 6462篇 |
综合类 | 5833篇 |
一般理论 | 69篇 |
预防医学 | 18691篇 |
眼科学 | 349篇 |
药学 | 5380篇 |
137篇 | |
中国医学 | 815篇 |
肿瘤学 | 2778篇 |
出版年
2024年 | 311篇 |
2023年 | 2866篇 |
2022年 | 3489篇 |
2021年 | 4718篇 |
2020年 | 5032篇 |
2019年 | 4901篇 |
2018年 | 4512篇 |
2017年 | 4024篇 |
2016年 | 3642篇 |
2015年 | 3431篇 |
2014年 | 6219篇 |
2013年 | 7396篇 |
2012年 | 4607篇 |
2011年 | 4708篇 |
2010年 | 3492篇 |
2009年 | 3647篇 |
2008年 | 3405篇 |
2007年 | 3538篇 |
2006年 | 3041篇 |
2005年 | 2487篇 |
2004年 | 2060篇 |
2003年 | 1618篇 |
2002年 | 1216篇 |
2001年 | 1086篇 |
2000年 | 973篇 |
1999年 | 823篇 |
1998年 | 703篇 |
1997年 | 564篇 |
1996年 | 515篇 |
1995年 | 379篇 |
1994年 | 347篇 |
1993年 | 317篇 |
1992年 | 228篇 |
1991年 | 204篇 |
1990年 | 172篇 |
1989年 | 138篇 |
1988年 | 111篇 |
1987年 | 116篇 |
1986年 | 93篇 |
1985年 | 112篇 |
1984年 | 93篇 |
1983年 | 62篇 |
1982年 | 57篇 |
1981年 | 48篇 |
1980年 | 47篇 |
1979年 | 35篇 |
1978年 | 21篇 |
1977年 | 21篇 |
1976年 | 17篇 |
1975年 | 12篇 |
排序方式: 共有10000条查询结果,搜索用时 74 毫秒
91.
92.
O. Weijtens G. W. S. Thoe Schwartzenberg J. C. Van Meurs 《Documenta ophthalmologica. Advances in ophthalmology》1996,92(1):37-40
Day care is generally accepted in anterior segment eye-surgery. In the Rotterdam Eye Hospital this option was also considered for posterior segment surgery. We were interested in the opinion, of patients on this matter and therefore asked patients, who were admitted for posterior segment eye-surgery, to answer a questionnaire. The major question was: ‘If your physician had given his permission, do you think it would have been possible for you to go home on the evening after surgery?’. Other questions evaluated problems in organising assistance at home and transportation to the out-patient clinic as well as circumstances after the operation, such as pain, nausea, dizziness and anxiety. Eighty-one out of 87 patients responded: 56% answered ‘eyes’ and 44% ‘no’ to the major question. Relating the answer to the major question to medical data and to answers to the other questions, we found organizational problems at home and anxiety to have a statistical significant relation with a negative answer. Clinical factors like age, American Society of Anesthesiologists (ASA)-class, diabetes mellitus (including insulin-dependant), type of anesthesia, time of the day the surgery was finished, duration of surgery, pain, nausea or dizziness were not signficantly related. The number of patients involved in this study, however, is too small to draw conclusions on specific subgroups of patients. 相似文献
93.
大白鼠游泳输出功测定仪的研制和疲劳方程Y=A+B/T的建立 总被引:1,自引:0,他引:1
研制了可以直接连续测量大鼠游泳输出功率的仪器,建立了一个理想的动物模型,通过分析对功率曲线进行函数拟合,得出了代表疲劳发生、作功能力下降的双曲线方程,通过分析衰竭时间和功、功率等参数的关系提出了衰竭阈概念。 相似文献
94.
T. Bendix A. F. Bendix E. Busch A. Jordan Tom Bendix MD 《Scandinavian journal of medicine & science in sports》1996,6(2):88-97
Conventional treatments have not slowed down the ever expanding low back pain (LBP) problem. Traditional treatment has most probably contributed to the growth of the problem. Therefore, in a search for new solutions, 'functional restoration' has been devised. In connection with chronic LBP the term has been associated with a full-day program lasting from 3 to 5 weeks. it includes multidisciplinary treatment of patients in groups with intensive physical and ergonomic training, psychological pain management, back school, as well as teaching in social/work related issues. The key concepts are 'acceptance of the pain', 'activity', 'self-responsibility', 'multidisciplinary' and 'quantitative functional evaluation (QFE)'. The latter is aimed so that the participants can feel the physical improvement, encouraging them to be able to go back to work, or at least to lead a more active life style. Several controlled studies suggest a lasting effect in terms of regaining their ability to work and improving pain behavior for a good part of disabled chronic LBP patients. However, it is noteworthy that randomized studies seemingly show poorer results than studies not employing randomized controls. 相似文献
95.
The therapeutic value of vasodilator prostaglandins in multiple organ failure associated with sepsis 总被引:4,自引:0,他引:4
There is considerable evidence from animal and human studies of sepsis and acute lung injury that prostacyclin and PGE1 may have a beneficial effect on tissue perfusion with a reduction in the severity of tissue damage associated with these disorders. As yet, there are no good data from controlled clinical trials that these agents improve survival and it is not clear whether in the future such data will be forthcoming. Nevertheless, using various physiological end-points, both prostaglandins seem to be beneficial in sepsis and when used in combination with the whole process of Intensive Therapy, may contribute to the survival of some cases. Although the assessment of combinations of agents designed to inhibit mediator release might be more useful, it remains to be seen whether the relatively insensitive controlled clinical trial, with survival as its endpoint, is the appropriate tool for assessing efficacy in the ITU. Perhaps, the consensus approach has something to offer in this situation! 相似文献
96.
Dr Jonas Hähnel MD Wolfgang Friesdorf MD Bernhard Schwilk MD Thomas Marx MD Silvia Blessing 《Journal of clinical monitoring and computing》1992,8(1):1-6
The technical equipment of today's intensive care unit (ICU) workstation has been characterized by a gradual, incremental accumulation of individual devices, whose presence is dictated by patient needs. These devices usually present differently designed controls, operate under different alarm philosophies, and cannot communicate with each other. By contrast, ICU workstations could be equipped permanently and in a standardized manner with electronically linked modules if the attending physicians could reliably predict, at the time of admission, the patient's equipment needs. Over a period of 3 1/2 months, the doctors working in our 20-bed surgical ICU made 1,000 predictions concerning outcome, equipment need, duration of artificial ventilation, and duration of hospitalization for 300 recently admitted patients. The interviews were made within the first 24 hours after admission. The doctors being interviewed were usually (i.e., in over 90% of cases) unfamiliar with the patient. Information concerning the patient's general state of health, special pre-ICU events, and complications was offered to the interviewed clinician because this information represents standard admission data. It was found that the equipment need (represented by two different setups, high tech and low tech) could be predicted most reliably (96.4% correct predictions) compared with a prediction on outcome of ICU treatment (94.5%), on duration of artificial ventilation (75.4%), and on duration of stay (43.4%). There was no significant (p>0.05) difference in the reliability of predictions between residents and consultants. Factors influencing the postoperative equipment need varied with surgical specialty. The general state of health, as indicated by the ASA classification (p<0.001), and the specific intervention (all multiple-valve replacements needed the high-level equipment standard) appeared to be most important in cardiac surgery, while a state of septicemia was important in general surgery (p<0.001). Our findings suggest that ICU workstations may be standardized into at least two types. 相似文献
97.
98.
Summary The effects on heart rate, oxygen uptake, and pulmonary ventilation of muscular exercises, including both dynamic contractions, either simple or combined, were studied in 4 male subjects, aged 21 to 23 years. The dynamic work consisted in cycling on an ergometric bicycle at three power levels: 40, 80, and 100 W. The static work consisted in pushing against, pulling and holding with the arms a 6, 9, 12, or 18 kg load. The physiological effects are expressed as cardiac cost (HR), oxygen cost (VO2) and ventilation cost (V). The physiological cost of the combined work increases according to the cycling power and to the isometric load developed. A statistical analysis shows that the costs of combined work are not different from the sum of the costs of the static and dynamic contractions measured separately. Thus, the physiological responses to the combinations investigated are of an additive type. 相似文献
99.
Florien van Heest Ilora Finlay Renée Otter Betty Meyboom-de Jong 《The British journal of general practice》2007,57(539):494-496
This study describes a novel type of support for GPs caring for patients dying at home: the establishment and evaluation of a telephone advisory service for GPs, run by GPs with a special interest in palliative care (GPwSIs) in the Netherlands 2000-2003. A growing number of GPs called for advice, 10% during out of hours. Prognosis of the patients was generally short (days to weeks in 70% of cases). Most advice sought by GPs concerned symptom management and on evaluation, 85% of the GPs followed the advice. 相似文献
100.
Simon Gilbody David Richards Michael Barkham 《The British journal of general practice》2007,57(541):650-652
There is increased emphasis on routine assessment of depression in primary care. This report is the first UK validation of two self-completed measures: the Patient Health Questionnaire (PHQ-9) and the Clinical Outcomes in Routine Evaluation-Outcome Measure (CORE-OM). Optimum cut-off points were established against a diagnostic gold standard in 93 patients. PHQ-9 sensitivity = 91.7% (95% confidence interval [CI] = 77.5 to 98.3%) and specificity 78.3% (95% CI = 65.8 to 87.9%). CORE-OM sensitivity = 91.7% (95% CI = 77.5 to 98.2%) and specificity = 76.7% (95% CI = 64.0 to 86.6%). Brief self-rated questionnaires are as good as clinician-administered instruments in detecting depression in UK primary care. 相似文献