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   27866篇
  免费   2705篇
  国内免费   934篇
耳鼻咽喉   204篇
儿科学   309篇
妇产科学   243篇
基础医学   1472篇
口腔科学   635篇
临床医学   4328篇
内科学   2549篇
皮肤病学   187篇
神经病学   1066篇
特种医学   776篇
外国民族医学   7篇
外科学   1963篇
综合类   4336篇
现状与发展   1篇
一般理论   1篇
预防医学   6422篇
眼科学   146篇
药学   3724篇
  81篇
中国医学   2330篇
肿瘤学   725篇
  2024年   191篇
  2023年   686篇
  2022年   1163篇
  2021年   1333篇
  2020年   1385篇
  2019年   1104篇
  2018年   1031篇
  2017年   1061篇
  2016年   1153篇
  2015年   1097篇
  2014年   2091篇
  2013年   2307篇
  2012年   1898篇
  2011年   2006篇
  2010年   1509篇
  2009年   1453篇
  2008年   1392篇
  2007年   1341篇
  2006年   1160篇
  2005年   933篇
  2004年   795篇
  2003年   664篇
  2002年   515篇
  2001年   456篇
  2000年   370篇
  1999年   355篇
  1998年   312篇
  1997年   223篇
  1996年   205篇
  1995年   177篇
  1994年   168篇
  1993年   121篇
  1992年   126篇
  1991年   95篇
  1990年   81篇
  1989年   73篇
  1988年   70篇
  1987年   47篇
  1986年   52篇
  1985年   54篇
  1984年   57篇
  1983年   26篇
  1982年   25篇
  1981年   25篇
  1980年   32篇
  1979年   13篇
  1978年   19篇
  1977年   14篇
  1975年   12篇
  1974年   8篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
The Student Training, Education and Practice for Dietetics (STEP‐DIET) CD‐ROM was developed at the University of Surrey to prepare dietetic students for the practical dietetic training component of their Nutrition/Dietetics degree. This study aimed to evaluate student response to the programme and its effectiveness as a teaching tool, based on the evaluation framework of D.L. Kirkpatrick (Evaluating a Course, 2nd edn. London, Kogan Page). Quantitative and qualitative methodologies were employed, with 41 dietetic students, separated by year group, completing questionnaires and taking part in six focus groups, at the University of Surrey. Student attitudes towards the instruction method and the STEP‐DIET programme itself were investigated, in conjunction with their perceived learning achievements. Students rated the programme highly in terms of design and content, however, there was a reluctance to accept computer‐assisted instruction (CAI) as a sole teaching method. A number of learning achievements relevant to dietetic practice were reported including a perceived increase in ability to conduct a dietetic interview and an increased understanding of the management of Type 2 diabetes. In general students reacted positively to the STEP‐DIET programme and it was perceived by students to be effective in preparing them for the practical component of their dietetic training.  相似文献   
32.
临床科室工作量评价方法及其应用   总被引:5,自引:1,他引:4  
目的:探讨测量、评价临床科室工作量的指标和方法,加强医院科室管理,促进效益评价与核算。方法:应用医院病案和报表资料,每月计算科室工作强度指数并进行排位,用相对比方法初步分析科室临床工作量和排位变动的状况。结果:选取了实际占用床位数、危重病人抢救次数、门急诊人次数、出会诊人次数、出院病人数5项指标,计算出各科室工作强度指数和排位,并对各科室工作量排位变动进行了比较。结论:临床工作量评价指标和方法的代表性、灵敏性和可靠性较好,实际评价效果也较客观地反映了各临床科室的实际工作量大小。  相似文献   
33.
网络模式下临床医师绩效评价指标体系研究   总被引:2,自引:0,他引:2  
为了充分利用医院信息网络信息,更为全面、客观地对医生进行评价,阐述建立网络模式下临床医师绩效评价指标体系的原则、方法,并对的建立指标体系的可信度及合理性进行了分析。  相似文献   
34.
BACKGROUND: Our objective was to determine the cost-effectiveness of a comprehensive, risk-based triage system, composed of multiple critical pathways, with the use of early myocardial perfusion imaging (MPI) in low-risk patients. We found previously that a chest pain evaluation system that uses MPI in low-risk patients was safe and effective, but the cost-effectiveness of this approach was not studied. METHODS AND RESULTS: We compared two groups. The Acute Cardiac Team (ACT) group (n = 874) was assigned prospectively to 1 of 4 risk levels by emergency department (ED) physicians. Level 1, 2, and 3 patients were admitted; level 4 patients were evaluated in the ED. Level 3 and 4 patients underwent ED MPI. The control group (n = 713) represented consecutive patients evaluated in the prior year according to standard care and assigned retrospectively to an ACT level based on the presenting electrocardiographic and clinical data. Record and hospital administrative data were assessed for clinical variables, outcomes, lengths of stay, and all expenses incurred within 30 days of the index visit. The baseline characteristics of the two groups were similar, including age, sex, myocardial infarction prevalence, and 30-day revascularization rates within each level or between the two groups. Mean costs per encounter were reduced for the ACT patients for each level, which was significant when all patients were compared ($5,030 +/- $7,081 vs $6,044 +/- $10,432, P =.02). Use of MPI in the low-risk patients was associated with reduced costs (level 3, $4,958 +/- $4,948 vs $5,051 +/- $7,036; level 4, $1,529 +/- $2,664 vs $1,794 +/- $6,854) and was associated with a significantly lower angiography rate and shorter length of stay. CONCLUSIONS: Implementation of a comprehensive strategy for chest pain evaluation and triage reduced overall costs for patients with chest pain on presentation. Acute MPI in the ED setting did not increase net cost.  相似文献   
35.
Up to 30% of patients with temporal lobe epilepsy (TLE) remain without remarkable changes in MRI. In this study we investigated the role of (1)H-MR spectroscopy ((1)H-MRS) in lateralizing the affected hemisphere in the mentioned patient group. Twenty-two consecutive patients diagnosed with TLE were investigated by high resolution MRI and (1)H-MRS. We examined the incidence and diagnostic accuracy of temporal metabolite alterations determined by Linear Combination of Model Spectra (L C Model) via water reference. Metabolite values of each hemisphere of TLE patients were compared with healthy controls. Results of metabolite alterations were related to intensive video EEG focus localization. Reduction of N-acetylaspartate + N-acetylaspartyl-glutamate (tNAA) in the affected hemisphere revealed identification in six of nine patients (66%) with unilateral TLE. Group comparison revealed a significant reduction of tNAA (6.1+/-0.8*) in the involved temporal lobe compared with controls (6.67+/-0.4*, P=0.026). Choline levels were significantly increased in the affected hemisphere (1.42+/-0.17*) compared with healthy controls (1.22+/-0.17*, P=0.035). The results of our study show that (1)H-MRS is able to identify the affected hemisphere of MRI negative TLE patients and can be used as an additive tool in multimodal focus localization.  相似文献   
36.
用外耳道外沿皮下缝合法制备了一种新的单侧听觉气传导持续阻滞大鼠模型。它具有制作简便、损伤较小、效果持续的优点。  相似文献   
37.
对173例支气管哮喘特异性脱敏治疗的疗效及影响疗效的因素进行了分析。结果表明:显效为30.6%(53/173).有效为56.1%(97/173),无效为13.3%(23/173)。影响疗效的因素与病情的程度有关,而与年龄、病程、皮试阳性反应强弱及脱敏治疗前4个疗程内是否应用曲安缩松等无关。并对特异性脱敏治疗支气管哮喘的优缺点进行讨论。  相似文献   
38.
Abstract The effectiveness of a 5% potassium nitrate dentifrice as a daily home treatment for dentinal hypersensitivity was evaluated in a double-blind study in 36 Japanese subjects who complained of cold and/or tactile hypersensitivity. The subjects were divided into 2 groups, with 18 being given a 5% potassium nitrate dentifrice (treated group) and the other 18 a vehicle paste (control group). Both groups were instructed to brush their teeth 2 × a day. The hypersensitivity levels of the affected teeth were assessed by 2 stimuli, one tactile and the other cold air, and by the perception of pain. The results of all 3 assessment methods indicated that the potassium nitrate dentifrice significantly decreased the level of hypersensitivity at weeks 4, 8, and 12. In the treated group, a rapid decrease of positive scores for both the cold air stimulus and the subjective symptoms appeared from week 2. Although a significant decrease of the assessment score was also observed in the control group, the reduction rate of the score was much greater in the treated group by ail 3 assessment methods at weeks 4, 8, and 12. Complete relief of subjective symptoms throughout the 12 weeks’examination was noted in 67% of the subjects in the treated group, but in only 6% in the control group. These results suggest the usefulness of a 5% potassium nitrate dentifrice in Japanese patients with dentinal hypersensitivity.  相似文献   
39.
同济医科大学控烟活动及效果评价   总被引:1,自引:0,他引:1  
我校自1993年开展控烟工作,1995年9月开始创办无吸烟大学校园,采取了卫生宣教和行政干预等综合措施,并进行了效果评价。高强度干预措施实施前期(1995年3月)和中期(1996年10月)相比,男医学生和男女学生平均吸烟率分别从16.3%和11.4%下降到9.6%和5.94%;男教工和男女教工平均吸烟率分别从28.6%和13.8%下降到13.9%和8.86%。  相似文献   
40.
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