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   74074篇
  免费   7164篇
  国内免费   2060篇
耳鼻咽喉   704篇
儿科学   1865篇
妇产科学   656篇
基础医学   5273篇
口腔科学   552篇
临床医学   11411篇
内科学   12739篇
皮肤病学   520篇
神经病学   6943篇
特种医学   2698篇
外国民族医学   2篇
外科学   6945篇
综合类   13509篇
现状与发展   3篇
预防医学   5353篇
眼科学   964篇
药学   7055篇
  108篇
中国医学   4566篇
肿瘤学   1432篇
  2024年   209篇
  2023年   1308篇
  2022年   2383篇
  2021年   3842篇
  2020年   3761篇
  2019年   2994篇
  2018年   2734篇
  2017年   3240篇
  2016年   3149篇
  2015年   2723篇
  2014年   5289篇
  2013年   5340篇
  2012年   4260篇
  2011年   4516篇
  2010年   3643篇
  2009年   3408篇
  2008年   3424篇
  2007年   3606篇
  2006年   3185篇
  2005年   2666篇
  2004年   2154篇
  2003年   1897篇
  2002年   1608篇
  2001年   1495篇
  2000年   1199篇
  1999年   1047篇
  1998年   875篇
  1997年   810篇
  1996年   715篇
  1995年   726篇
  1994年   647篇
  1993年   501篇
  1992年   547篇
  1991年   431篇
  1990年   376篇
  1989年   313篇
  1988年   310篇
  1987年   288篇
  1986年   230篇
  1985年   243篇
  1984年   230篇
  1983年   143篇
  1982年   172篇
  1981年   119篇
  1980年   91篇
  1979年   103篇
  1978年   101篇
  1977年   51篇
  1976年   58篇
  1975年   40篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.

Objectives

The current study investigated the effects of two exercise interventions on cognitive function amongst breast cancer survivors.

Design

Pilot randomised-controlled trial.

Methods

Seventeen female cancer survivors (mean: 62.9 ± 7.8 years) were randomised into three groups: high-intensity interval training (HIIT, n = 6); moderate-intensity continuous training (MOD, n = 5); or wait-list control (CON, n = 6). The HIIT and MOD groups exercised on a cycle ergometer 3 days/week for 12-weeks. Primary outcomes were cognitive function assessments utilising CogState. Secondary outcomes were resting middle cerebral artery blood flow velocity, cerebrovascular reactivity and aerobic fitness (VO2peak). Data were analysed with General Linear Mixed Models and Cohen’s d effect sizes were calculated.

Results

All 17 participants who were randomised were available for follow-up analysis and adherence was similar for HIIT and MOD (78.7 ± 13.2% vs 79.4 ± 12.0%; p = 0.93). Although there were no significant differences in the cognitive and cerebrovascular outcomes, HIIT produced moderate to large positive effects in comparison to MOD and CON for outcomes including episodic memory, working memory, executive function, cerebral blood flow and cerebrovascular reactivity. HIIT significantly increased VO2peak by 19.3% (d = 1.28) and MOD had a non-significant 5.6% (d = 0.72) increase, compared to CON which had a 2.6% decrease.

Conclusions

This study provides preliminary evidence that HIIT may be an effective exercise intervention to improve cognitive performance, cerebrovascular function and aerobic fitness in breast cancer survivors. Considering the sample size is small, these results should be confirmed through larger clinical trials.  相似文献   
82.
目的 采用网络药理学阐明济脉通片多成分-多靶点-多途径的作用理念,为进一步研究济脉通片降压药效物质基础和机制提供一定理论参考。方法 通过TCMSP数据库,结合口服利用度(≥ 30%)和类药性分析(≥ 0.18)参数,筛选济脉通片的活性成分;通过Drugbank和TCMSP数据库进行靶点预测分析;通过GENCARD数据库筛选出高血压疾病相关基因;结合DAVID和KEGG数据库进行GO分析和通路分析;使用Cystoscope软件构建"化合物-靶点-作用通路"网络图。结果 经筛选后得到济脉通片的33个化合物,148个潜在靶基因并映射到了223条信号通路,其中31条信号通路与高血压的发生发展密切相关,其中AGE-RAGE signaling pathway in diabetic complications、PI3K-Akt signaling pathway、TNFsignaling pathway、Adrenergic signaling in cardiomyocytes和Focal adhesion为重要的通路枢纽。结论 济脉通片主要通过多成分、多靶点、多通路调节血管内皮功能、炎症反应、钙钠离子转运、糖脂代谢等参与血管舒张、改善炎症、调节机体代谢、调节离子转运等而产生降压作用。  相似文献   
83.
目的:探析口腔种植牙术后肿胀疼痛采取新癀片进行治疗的效果及对炎性因子的影响。方法:选取2015年1月至2019年12月北京中医药大学东直门医院收治的口腔种植牙术后肿胀疼痛患者300例作为研究对象,按照随机数字表法随机分为对照组和观察组,每组150例,对照组采用红霉素治疗,观察组采用新癀片联合红霉素治疗,比较2组患者术后肿胀和术后疼痛持续时间、牙槽骨吸收量、种植牙功能、种植体唇侧骨厚度、周围边缘骨吸收量、炎性反应因子水平、治疗优良率等指标。结果:与对照组比较,观察组术后肿胀持续时间、术后疼痛持续时间明显较短(P<0.05);观察组种植牙功能评分等明显高于对照组(P<0.05);观察组种植体唇侧骨厚度、周围边缘骨吸收量与对照组比较有明显差别(P<0.05);观察组CPR、IL-6、PCT等炎性反应因子水平明显较低(P<0.05);观察组治疗总有效率明显高于对照组(P<0.05)。结论:口腔种植牙术后肿胀疼痛应用新癀片进行治疗,能获得较为理想的效果,改善炎性反应因子水平,有着极大的推广价值。  相似文献   
84.
《中国现代医生》2020,58(2):135-138+封三
目的探讨实时剪切波弹性成像在评估拉米夫定治疗乙肝纤维化临床疗效中的作用。方法选取2017年1月~2018年1月我院收治的80例乙肝纤维化患者,根据随机数字法分为对照组和观察组,每组40例。对照组采用常规治疗,观察组在对照组的基础上给予拉米夫定进行治疗,治疗6个月。比较两组治疗前后肝功能、肝纤维化指标,利用实时剪切波弹性成像评估两组治疗前后肝脏弹性模量值及肝穿刺活检情况,并进行比较。结果两组治疗后AST、ALT、TBIL水平均明显低于治疗前,差异有统计学意义(P0.05);观察组治疗后AST、ALT、TBIL水平均明显低于对照组,差异有统计学意义(P0.05);两组治疗后HA、LN、PⅢPN-P、CL-Ⅳ水平及杨氏弹性模量值均显著低于治疗前,差异有统计学意义(P0.05);观察组治疗后HA、LN、PⅢPN-P、CL-Ⅳ水平及杨氏弹性模量值均显著低于对照组,差异有统计学意义(P0.05);与治疗前相比,两组治疗后肝穿刺活检结果均有好转,尤其是汇管区、肝小叶内炎症及肝纤维化改善明显。结论实时剪切波弹性成像作为肝脏硬度定量检测的无创性技术,可用于拉米夫定治疗乙肝纤维化临床疗效评估的重要方法。  相似文献   
85.
目的:探讨肾炎1号方联合西药治疗肾病综合征临床疗效及对患者凝血指标、免疫功能的影响。方法:选取肾病综合征患者共52例,分为对照组26例、治疗组26例。两组患者均予以基础治疗,对照组在基础治疗上给予泼尼松片治疗。治疗组在对照组基础上加用肾炎1号方治疗。结果:与对照组治疗后相比,治疗组治疗24 h后Upr、CHOL、TG、Scr、Fg、D-D均下降,差异有统计学意义(P<0.05)。治疗组治疗后补体C3升高明显,与对照组比较,差异有统计学意义(P<0.05)。治疗后治疗组中医证候积分各项均低于对照组,治疗组总有效率88.46%高于对照组的76.92%,差异均有统计学意义(P<0.05)。结论:肾炎1号方联合西药治疗肾病综合征临床效果较好,能更有效地控制患者蛋白尿、升高血清白蛋白水平、降低血清胆固醇,并且能调节机体体液免疫紊乱、改善高凝状态。  相似文献   
86.
《Journal of hand therapy》2020,33(4):528-539
Study DesignProspective longitudinal cohort study.IntroductionTraumatic brachial plexus injuries (BPIs) can be devastating and negatively impact daily function and quality of life. Occupational therapists play an important role in rehabilitation; however, studies identifying outcomes are lacking.PurposeThis study aims to describe outcomes including motor recovery, upper limb function, participation, pain, and quality of life for people receiving occupational therapy intervention.MethodsA convenience sample of English-speaking adults (n = 30) with a traumatic BPI, attending the clinic between December 1, 2014, to November 30, 2016, participated. Participants received occupational therapy focusing on sensorimotor retraining and activity-based rehabilitation. Data on active range of motion (goniometry), strength (Medical Research Council (MRC)), upper-limb function (UEFI15, QuickDASH), participation (PSFS), pain (Brief Pain Inventory), and quality of life (EQ-5D-3L) were collected at baseline, 3, 6, 9, and 12 months.ResultsElbow flexion strength showed significant improvement at all time-points, average increase 2.17 (MRC) (95% confidence interval: 1.29-3.04; P < .001) and mean final MRC grading 3.86 (standard error: 0.44). Significant improvements at 12 months were seen in: shoulder abduction strength and range, flexion strength and range, external rotation range; elbow extension strength and flexion range; thumb flexion and extension strength. Upper limb function (QuickDASH) showed significant improvement (mean change = 18.85; 95% confidence interval: 4.12-33.59; P = .02). Forearm protonation range and finger flexion strength were significantly worse. Remaining outcomes did not show significant improvement.ConclusionsOccupational therapy with surgical intervention can improve strength, range, and upper limb function with people following traumatic BPI. Further investigations into impact on participation, pain, and quality of life are required.  相似文献   
87.
Algorithms based on deep neural networks (DNNs) have attracted increasing attention from the scientific computing community. DNN based algorithms are easy to implement, natural for nonlinear problems, and have shown great potential to overcome the curse of dimensionality. In this work, we utilize the multi-scale DNN-based algorithm (MscaleDNN) proposed by Liu, Cai and Xu (2020) to solve multi-scale elliptic problems with possible nonlinearity, for example, the p-Laplacian problem. We improve the MscaleDNN algorithm by a smooth and localized activation function. Several numerical examples of multi-scale elliptic problems with separable or non-separable scales in low-dimensional and high-dimensional Euclidean spaces are used to demonstrate the effectiveness and accuracy of the MscaleDNN numerical scheme.  相似文献   
88.
89.
BackgroundDistal radial access (DRA) has been proposed to improve procedure ergonomics and favor radial artery patency. Although promising data, nothing is known on evolving hand function after DRA.ObjectivesThis study sought to comprehensively evaluate hand function in patients undergoing DRA.MethodsReal-world patients undergoing DRA undertook a thorough multimodality assessment of hand function implementing multidomain questionnaires (Disabilities of the Arm, Shoulder and Hand and Levine-Katz), and motor (pinch grip test) and sensory (Semmes-Weinstein monofilaments test) examinations of both hands. All assessments were performed at preprocedural baseline and planned at 1-, 6-, and 12-month follow-up (FU). Adverse clinical and procedural events were documented too.ResultsData of 313 patients (220 men, age 66 ± 10 years) from 9 international centers were analyzed. The Disabilities of the Arm, Shoulder and Hand and the Levine-Katz scores slightly improved from baseline to FU (P = 0.008 and P = 0.029, respectively). Pinch strength mildly improved from baseline to FU (P < 0.001 for both the left and right hands). Similarly, touch pressure threshold appeared to faintly improve in both the left and right hands (P < 0.012 for all the sites). For both motor and sensory function tests, comparable findings were found for the DRA hand and the contralateral one, with no significant differences between them. Repeated assessment of all tests over all FU time points similarly showed lack of worsening hand function. Access-related adverse events included 19 harmless bleedings and 3 forearm radial artery and 3 distal radial artery occlusions. None affected hand function at FU.ConclusionsIn a systematic multidimensional assessment, DRA was not associated with hand function impairment. Moreover, DRA emerges as a safe alternative vascular access.  相似文献   
90.
目的:对比解剖性肝脏体积(ALV)和功能性肝脏体积(FLV)与肝功能Child-Pugh分级的相关性。方法:选择温州医科大学附属第二医院育英儿童医院2014年1月至2019年4月同时行增强CT和Gd-EOB-DTPA增强MRI扫描的肝硬化患者25例。对所有患者进行肝功能Child-Pugh评分,检测所有入组患者每个肝段的Gd-EOB-DTPA增强MRI平扫期和肝胆特异期的信号对比增强率(CER),以CT扫描的数据为基础利用MI-3DVS计算每个肝段的ALV和全肝的FLV。分析ALV和FLV与肝功能Child-Pugh分级的相关性。结果:肝功能Child-Pugh分级与ALV呈负相关(r=-0.792,P<0.001),曲线拟合的决定系数(R2)=0.63;肝功能Child-Pugh分级与FLV亦呈负相关(r=-0.911,P<0.001),曲线拟合的R2=0.80。FLV与肝功能Child-Pugh分级有更显著的负相关性。结论:结合Gd-EOB-DTPA增强MRI平扫期和肝胆特异期的信号CER和ALV计算所得的FLV较ALV能更好地反映肝脏的功能状态。  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