全文获取类型
收费全文 | 17412篇 |
免费 | 1479篇 |
国内免费 | 967篇 |
专业分类
耳鼻咽喉 | 328篇 |
儿科学 | 191篇 |
妇产科学 | 52篇 |
基础医学 | 578篇 |
口腔科学 | 330篇 |
临床医学 | 6865篇 |
内科学 | 1869篇 |
皮肤病学 | 32篇 |
神经病学 | 1257篇 |
特种医学 | 338篇 |
外国民族医学 | 3篇 |
外科学 | 2363篇 |
综合类 | 2362篇 |
现状与发展 | 1篇 |
预防医学 | 1449篇 |
眼科学 | 159篇 |
药学 | 691篇 |
71篇 | |
中国医学 | 709篇 |
肿瘤学 | 210篇 |
出版年
2024年 | 68篇 |
2023年 | 389篇 |
2022年 | 746篇 |
2021年 | 1097篇 |
2020年 | 1088篇 |
2019年 | 883篇 |
2018年 | 843篇 |
2017年 | 822篇 |
2016年 | 718篇 |
2015年 | 655篇 |
2014年 | 1306篇 |
2013年 | 1978篇 |
2012年 | 925篇 |
2011年 | 981篇 |
2010年 | 804篇 |
2009年 | 697篇 |
2008年 | 706篇 |
2007年 | 765篇 |
2006年 | 690篇 |
2005年 | 540篇 |
2004年 | 459篇 |
2003年 | 464篇 |
2002年 | 354篇 |
2001年 | 331篇 |
2000年 | 251篇 |
1999年 | 189篇 |
1998年 | 152篇 |
1997年 | 157篇 |
1996年 | 107篇 |
1995年 | 116篇 |
1994年 | 85篇 |
1993年 | 66篇 |
1992年 | 64篇 |
1991年 | 41篇 |
1990年 | 38篇 |
1989年 | 35篇 |
1988年 | 32篇 |
1987年 | 24篇 |
1986年 | 27篇 |
1985年 | 27篇 |
1984年 | 26篇 |
1983年 | 19篇 |
1982年 | 26篇 |
1981年 | 20篇 |
1980年 | 17篇 |
1979年 | 5篇 |
1978年 | 10篇 |
1977年 | 5篇 |
1976年 | 4篇 |
1975年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Eli Peli 《Ophthalmic & physiological optics》2005,25(6):543-555
Subjects with central field loss (CFL) individually selected enhancement parameters to improve visibility of static video images. The effect of enhancement on performance and on perceived quality of motion video was assessed. Performance, e.g. recognition of visual details, was assessed by having subjects answer questions regarding visual information contained in the video motion segments that were enhanced using the individually-selected parameters. Enhancement did not improve subject performance on questions about video content. This result might be due to a ceiling effect limitation of the performance assessment method. In a second procedure, subjects' continuous perceptions of quality (using an adjective-based rating scale) were made while the enhancement parameters were abruptly switched among multiple values; these included the individually-selected enhancements, as well as unenhanced, over-enhanced, and degraded segments. The results indicate that adaptive enhancement (individually-tuned using a static image) adds significantly to perceived image quality when viewing motion video. Subjects who selected stronger contrast enhancement also perceived the enhancement to provide a larger benefit in image quality. 相似文献
52.
53.
脑卒中偏瘫康复训练程序化研究 总被引:4,自引:0,他引:4
目的 :观察脑卒中偏瘫患者进行康复训练的疗效。方法 :2 2例脑卒中患者 :康复组 12例 ,对照组 10例。 2组均接受神经科常规药物治疗。康复组按“中风后程序化康复训练表”进行康复训练 ,分别于康复前、康复后 1月和 3月进行疗效评定。结果 :日常生活活动能力量表 (ADL)测评结果显示 :康复组有效率 83 3% (10 / 12 ) ,对照组 30 % (3/10 ) ,2组差别有显著意义 (P <0 0 5 )。神经功能缺损评分结果显示 :康复组有效率 91 7% (11/ 12 ) ,对照组 4 0 % (4 / 10 ) ,2组差别有显著意义 (P <0 0 1)。结论 :康复训练能降低脑卒中偏瘫患者的致残率 ,提高生活质量。 相似文献
54.
55.
目的:回顾性总结重症心脏瓣膜病置换术体外循环经验.方法:105例重症心脏瓣膜病患者,使用stockerⅢ型心肺机及膜式氧合器,体外循环中采用中度低温,预充白蛋白并附加人工肾超滤,心肌保护用高钾含血停搏液灌注.结果:105例患者均顺利脱机,无1例死亡.体外循环时间60~180 min,主动脉阻断时间60~120 min,所有患者均顺利脱离体外循环,心脏自动复跳86例,电击19例.结论:手术中加强心肌保护,可减低手术后的功能衰竭和并发症,并可有效提高手术成功率. 相似文献
56.
57.
初级心肺复苏术是针对呼吸心跳骤停的病人所采取的一种紧急抢救措施,不言而喻其关乎我们每个公民的生命.本文先给出心肺复苏术的概念,紧接着从各个方面剖析论述我国心肺复苏术的现状并给出对比资料和调研数据进一步为我们敲响了警钟,然后引出普及心肺复苏术这个主题并强调其必要性和可行性,同时唤醒了人们沉睡的意识,最后详细具体的给出各种改变我们落后现状实现普及心肺复苏术这个目标的措施. 相似文献
58.
August Colenbrander 《Acta ophthalmologica. Supplement》2010,88(2):163-173
This article, based on a report prepared for the International Council of Ophthalmology (ICO) and the International Society for Low Vision Research and Rehabilitation (ISLRR), explores the assessment of various aspects of visual functioning as needed to document the outcomes of vision rehabilitation. Documenting patient abilities and functional vision (how the person functions) is distinct from the measurement of visual functions (how the eye functions) and also from the assessment of quality of life. All three areas are important, but their assessment should not be mixed. Observation of task performance offers the most objective measure of functional vision, but it is time‐consuming and not feasible for many tasks. Where possible, timing and error rates provide an easy score. Patient response questionnaires provide an alternative. They may save time and can cover a wider area, but the responses are subjective and proper scoring presents problems. Simple Likert scoring still predominates but Rasch analysis, needed to provide better result scales, is gaining ground. Selection of questions is another problem. If the range of difficulties does not match the range of patient abilities, and if the difficulties are not distributed evenly, the results are not optimal. This may be an argument to use different outcome questions for different conditions. Generic questionnaires are appropriate for the assessment of generic quality of life, but not for specific rehabilitation outcomes. Different questionnaires are also needed for screening, intake and outcomes. Intake questions must be relevant to actual needs to allow prioritization of rehabilitation goals; the activity inventory presents a prototype. Outcome questions should be targeted at predefined rehabilitation goals. The Appendix cites some promising examples. The Low Vision Intervention Trial (LOVIT) is an example of a properly designed randomized control study, and has demonstrated the remarkable effectiveness of vision rehabilitation. It is hoped that further similar studies will follow. 相似文献
59.
60.
The number of left ventricular assist device (LVAD) implantations is growing as a result of increased waiting periods for cardiac transplantation and the decreased availability of organ donors. Furthermore, the Food and Drug Administration (FDA) has approved permanent LVAD support. After an acute hospitalization, patients with LVADs may need prolonged convalescence in a healthcare facility because they have complex medical needs and are physically disabled. Admission criteria need to be developed as essential patient and nursing competencies need to be defined as a part of a successful LVAD program in an acute rehabilitation center. Acute rehabilitation centers can help patients with LVADs transition to a home setting. 相似文献