首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   29010篇
  免费   2659篇
  国内免费   768篇
耳鼻咽喉   416篇
儿科学   501篇
妇产科学   313篇
基础医学   2550篇
口腔科学   511篇
临床医学   6520篇
内科学   2714篇
皮肤病学   102篇
神经病学   3010篇
特种医学   1832篇
外科学   2981篇
综合类   4344篇
现状与发展   1篇
一般理论   3篇
预防医学   2846篇
眼科学   278篇
药学   1494篇
  260篇
中国医学   1332篇
肿瘤学   429篇
  2024年   93篇
  2023年   644篇
  2022年   1207篇
  2021年   1717篇
  2020年   1730篇
  2019年   1297篇
  2018年   1249篇
  2017年   1298篇
  2016年   1144篇
  2015年   1110篇
  2014年   2457篇
  2013年   2814篇
  2012年   1914篇
  2011年   1964篇
  2010年   1502篇
  2009年   1416篇
  2008年   1357篇
  2007年   1195篇
  2006年   1038篇
  2005年   845篇
  2004年   670篇
  2003年   543篇
  2002年   436篇
  2001年   356篇
  2000年   321篇
  1999年   266篇
  1998年   219篇
  1997年   195篇
  1996年   177篇
  1995年   142篇
  1994年   108篇
  1993年   112篇
  1992年   131篇
  1991年   81篇
  1990年   77篇
  1989年   62篇
  1988年   66篇
  1987年   53篇
  1986年   40篇
  1985年   42篇
  1984年   56篇
  1983年   39篇
  1982年   39篇
  1981年   34篇
  1980年   29篇
  1979年   21篇
  1978年   25篇
  1977年   24篇
  1976年   17篇
  1975年   18篇
排序方式: 共有10000条查询结果,搜索用时 390 毫秒
61.
张磊  许建明  胡乃中 《安徽医学》2004,25(3):251-252,250
目的 评价不同药物治疗功能性消化不良的经济效果。方法 运用经济学中的成本 -效果分析方法 ,对莫沙必利、伊托必利和吗丁啉治疗功能性消化不良方案进行分析。结果 莫沙必利与吗丁啉成本效果比相当 ,但所需增长的成本效果比高 ;伊托必利的成本效果比和增长的成本效果比均高于吗丁啉。结论 吗丁啉是治疗功能性消化不良的最佳用药方案  相似文献   
62.
抗抑郁治疗对功能性消化不良的辅助治疗作用   总被引:6,自引:0,他引:6  
丁育荣 《医学综述》2006,12(3):190-191
功能性消化不良是指具有上腹痛、上腹胀,早饱、暖气、食欲不振、恶心、呕吐等上腹不适症状,经检查排除引起这些症状的器质性疾病的一组临床综合征。在经济、科技、工业化高度发展的社会,已经成为危害人们健康状况和生活质量的最常见的消化系统疾病,因而受到广泛重视。欧美的流行病学调查表明,普通人群中有消化不良症状者占19%-41%,在我国人群中总的患病率为20%。普通门诊中占20%-40%,在消化专科中占60%-70%。FD的发病机制复杂,部分患者存在精神心理的异常,本文通过对FD患者进行抑郁自评量表(zuag评分)评定和抗抑郁药物治疗,旨在探讨二者关系及抗抑郁治疗FD的疗效。  相似文献   
63.
目的探讨新兵训练对女性月经的影响。方法女性新兵200名,参加队列和体能训练3个月,分别记录训练前、训练中、训练后的月经、体质量状况及心理评估。结果新兵训练中的月经周期异常率、经期异常率和痛经发生率均明显高于新兵训练前,体质量明显减轻,差异有显著性意义(P<0.05)。新兵训练结束转入正常部队生活1年后,月经周期异常率、经期异常率、痛经发生率均有明显下降(P<0.05)。结论新兵训练对女性月经有明显影响,其影响是功能性、暂时性和可逆性的,并非器质性损害。  相似文献   
64.
Guidelines for design of clinical trials evaluating behavioral headache treatments were developed to facilitate production of quality research evaluating behavioral therapies for management of primary headache disorders. These guidelines were produced by a Workgroup of headache researchers under auspices of the American Headache Society. The guidelines are complementary to and modeled after guidelines for pharmacological trials published by the International Headache Society, but they address methodologic considerations unique to behavioral and other nonpharmacological treatments. Explicit guidelines for evaluating behavioral headache therapies are needed as the optimal methodology for behavioral (and other nonpharmacologic) trials necessarily differs from the preferred methodology for drug trials. In addition, trials comparing and integrating drug and behavioral therapies present methodological challenges not addressed by guidelines for pharmacologic research. These guidelines address patient selection, trial design for behavioral treatments and for comparisons across multiple treatment modalities (eg, behavioral vs pharmacologic), evaluation of results, and research ethics. Although developed specifically for behavioral therapies, the guidelines may apply to the design of clinical trials evaluating many forms of nonpharmacologic therapies for headache.  相似文献   
65.
Objective:  This pilot study was intended to test whether a training protocol improved validity of odor judges (OJs), with or without experience, and whether odorant types differed in error proneness.
Methods:  The OJs (four experienced, two inexperienced) completed a 4-phase training protocol based on the American Society of Testing and Materials standards (ASTM): (i) introduction to sensory scales, n-butanol reference, sniffing techniques; (ii) pretraining measurements; 20 samples of varying intensities of four unpleasant and three pleasant odorants; (iii) exercises assessing quality, intensity, ranking, and matching; and (iv) post-training measurements.
Main outcome measures:  Subjects' intensity scores were analyzed as the absolute difference from the 'true' intensity (ASTM n-butanol standard) using repeated measures ANOVA.
Results:  Training significantly ( P  = 0.02) reduced OJ errors. Experienced and novice judges did not differ in average errors ( P  = 0.99), or in improvement in error from pre- to post-training ( P  = 0.94). Improvement was consistent from pre- to post-training for all odorants except dimethylsulfide for which errors worsened ( P  = 0.01). Unpleasant and pleasant odorants differed ( P  = 0.006) in error. After removing water the effects of water control scores from the pleasant odorants, the difference was not significant ( P  = 0.26).
Conclusions:  The OJs improved in their ability to assess odor intensity irrespective of previous experience. Training is recommended for all OJs prior to research trials.  相似文献   
66.
论医药卫生法学专业学生实务能力的培养   总被引:2,自引:0,他引:2  
加强医药卫生法学专业学生实务能力的培养,是实现医药卫生法学专业培养目标的需要.在教学中,通过运用案例教学法、讨论式教学法,开展模拟法庭、第二课堂活动,组织临床见习、毕业实习等途径,培养即有法律知识又有医药卫生知识的复合型人才.  相似文献   
67.
护理本科生双导师制带教模式的实践   总被引:4,自引:2,他引:2  
沈红五 《护理学杂志》2006,21(19):56-58
目的 探索适合护理本科生的临床带教模式.方法 将2001级和2000级护理本科生分为实验组(n=24)和对照组(n=38),对照组给予传统带教模式带教,实验组采用双导师制带教模式,即每名学生在临床实习期间,由1名临床专科导师负责其本科室专科知识方面的指导,1名全程导师负责其实习全过程的督导及检查工作,护理部在学生实习结束前进行带教满意率测评及实习效果评价,并与对照组进行比较.结果 两组对医院带教很满意率、学生护理理论、操作技能考核成绩、论文书写优良率比较,差异有显著性意义(均P<0.01).结论 双导师制可提高带教质量,是受学生好评和欢迎的带教模式.  相似文献   
68.
本文报告热习服对血浆丙二醛和中分子物质含量的影响。15名健康男子,平均年龄21.8±0.7岁,于平均气温27.3±1.2℃负重行军90min,2周内共锻炼11次(天)。标准热暴露试验对比表明获得了热习服,肛温和心率增值大大降低(P<0.01和P<0.05)。锻炼期前、后标准试验时血浆丙二醛含量降幅分别为29.4%(P<0.01)和30.1%(P<0.01),而中分子物质含量增幅分别为6.3%(P<0.05)和9.2%(P<0.01)。热前、后血浆丙二醛含量较锻炼期前仅分别降低5.5和6.5%(P>0.05),而中分子物质含量分别降低18.3和16.1%(P<0.01),可见,热习服后血浆丙二醛和中分子物质含量没有同步降低。  相似文献   
69.
Summary Eight men (20–23 years) weight trained 3 days week–1 for 19 weeks. Training sessions consisted of six sets of a leg press exercise (simultaneous hip and knee extension and ankle plantar flexion) on a weight machine, the last three sets with the heaviest weight that could be used for 7–20 repetitions. In comparison to a control group (n = 6) only the trained group increased (P<0.01) weight lifting performance (heaviest weight lifted for one repetition, 29%), and left and right knee extensor cross-sectional area (CAT scanning and computerized planimetry, 11%, P<0.05). In contrast, training caused no increase in maximal voluntary isometric knee extension strength, electrically evoked knee extensor peak twitch torque, and knee extensor motor unit activation (interpolated twitch method). These data indicate that a moderate but significant amount of hypertrophy induced by weight training does not necessarily increase performance in an isometric strength task different from the training task but involving the same muscle group. The failure of evoked twitch torque to increase despite hypertrophy may further indicate that moderate hypertrophy in the early stage of strength training may not necessarily cause an increase in intrinsic muscle force generating capacity.  相似文献   
70.
Compared with the knowledge on immobilization, the effects of remobilization on musculoskeletal tissues have not been well established. What is sure is that remobilization and rehabilitation of any component of the musculoskeletal tissues require much more time than the time needed to cause the immobilization atrophy. With intensive rehabilitation, the functional properties of skeletal muscles can be improved significantly even years after the injury and following immobilization, but no study has shown whether full recovery is possible and whether these rehabilitated muscles are able to respond normally to further training. Experimental studies have given evidence that slow-twitch muscle fibres have better capacity for recovery than fast-twitch fibres, most likely due to better circulation and higher protein turnover. Also evidence has been given that fibre regeneration is possible through satellite cell activation and myotube formation. Very little is known, however, about the effects of age, gender or the level of preimmobilization muscle performance on the restoration capacity. Also the fate of the marked structural changes (for example, connective tissue accumulation) induced by immobilization is unknown. Tendon and ligament tissues are likely to respond appropriately to remobilization, resulting in acceleration of collagen synthesis and fibril neoformation. However, there is a strong suspicion that remobilized tendons and ligaments will not achieve all the biochemical and biomechanical properties of their healthy counterparts. Specifically, the amount of weak type III collagen has been shown to be overrepresented in these tissues instead of mature, strong type I collagen. It is not known whether this is an important risk factor for ruptures during later activity. The effects of remobilization on muscle-tendon junction and proprioceptive organs are not known. It would not be surprising if the serious structural changes induced by immobilization were unrestorable. In the literature dealing with immobilization and remobilization, cartilage degeneration is always a major concern, because not only too strenuous training or immobilization, but also unskilful remobilization may activate this process leading finally to osteoarthrosis. Bone may be one of the best components of musculoskeletal tissues to respond to remobilization, probably because the immobilization atrophy of bone is largely quantitative (osteoporosis) only. The prerequisites for bony recovery are that the follow-up time is long enough (months) and that immobilization has not exceeded about 6 months, the time limit between active and inactive (irreversible) osteoporosis. Prevention of the atrophying effects of immobilization can be very successful if performed properly. According to present knowledge, there are many methods for the purpose, including preimmobilization training early, controlled mobilization; optimal positioning of the immobilized joint; muscular training during immobilization; early weightbearing; exercise with the nonimmobilized extremity; and electrical stimulation. Lots of education and information will be needed, however, before these methods are deeply rooted in the daily routines of the attending physicians, physical therapists, athletic trainers and other persons involved in the treatment of musculoskeletal problems.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号