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   57602篇
  免费   6462篇
  国内免费   1547篇
耳鼻咽喉   620篇
儿科学   931篇
妇产科学   930篇
基础医学   2547篇
口腔科学   1386篇
临床医学   10665篇
内科学   5652篇
皮肤病学   819篇
神经病学   2588篇
特种医学   1416篇
外国民族医学   5篇
外科学   4469篇
综合类   7635篇
现状与发展   1篇
一般理论   6篇
预防医学   10659篇
眼科学   1016篇
药学   6089篇
  227篇
中国医学   5055篇
肿瘤学   2895篇
  2024年   135篇
  2023年   1491篇
  2022年   1734篇
  2021年   2948篇
  2020年   3392篇
  2019年   2877篇
  2018年   2611篇
  2017年   2862篇
  2016年   2673篇
  2015年   2569篇
  2014年   4757篇
  2013年   4818篇
  2012年   4115篇
  2011年   4093篇
  2010年   3106篇
  2009年   2947篇
  2008年   2974篇
  2007年   2792篇
  2006年   2463篇
  2005年   1934篇
  2004年   1607篇
  2003年   1333篇
  2002年   1030篇
  2001年   827篇
  2000年   630篇
  1999年   489篇
  1998年   364篇
  1997年   341篇
  1996年   267篇
  1995年   272篇
  1994年   207篇
  1993年   182篇
  1992年   169篇
  1991年   103篇
  1990年   77篇
  1989年   64篇
  1988年   50篇
  1987年   44篇
  1986年   27篇
  1985年   59篇
  1984年   47篇
  1983年   20篇
  1982年   30篇
  1981年   27篇
  1980年   14篇
  1979年   14篇
  1978年   4篇
  1977年   5篇
  1975年   5篇
  1973年   3篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
11.
PurposeTo review and to compare indirectly the outcomes of minimally invasive therapies for the treatment of lower urinary tract symptoms secondary to benign prostatic hyperplasia.Materials and MethodsA literature search via Medline and Cochrane Central databases was completed for randomized control studies published between January 2000 to April 2020 for the following therapies: Rezum, Urolift, Aquablation, and prostatic artery embolization (PAE). Data on the following variables were included: International prostate symptom score (IPSS), maximum urinary flow rate, quality of life, and postvoid residual (PVR). Standard mean differences between treatments were compared through a meta-analysis using transurethral resection of the prostate (TURP) to assess differences in treatment effect.ResultsThere was no significant difference in outcomes between therapies for IPSS at the 3, 6, and 12-month follow ups. Although outcomes for Rezum were only available out to 3 months, there were no consistently significant differences in outcomes when comparing Aquablation versus PAE versus Rezum. TURP PVR was significantly better than Urolift at 3, 6, and 12 months. No significant differences in minor or major adverse events were noted.ConclusionAlthough significant differences in outcomes were limited, Aquablation and PAE were the most durable at 12 months. PAE has been well studied on multiple randomized control trials with minimal adverse events while Aquablation has limited high quality data and has been associated with bleeding-related complications.  相似文献   
12.
13.
PurposeTo compare the characteristics of polidocanol (POL) and ethanolamine oleate (EO) sclerosing foams produced by a Shirasu porous glass membrane (SPGM) device with those made using a 3-way stopcock (3WSC).Materials and MethodsFoam half-life times were measured in an ex-vivo benchtop study. Computed tomography (CT) images of each foam were obtained over the time course, and a CT texture analysis was conducted. The bubble size in each foam was measured by an optical microscope.ResultsMedian foam half-life times were longer in the SPGM group than in the 3WSC group (POL: 198 vs 166 s, P = .02; EO: 640 vs 391 s, P < .01). In the CT texture analysis, median standard deviation (SD) and entropy (randomness) were lower, and median energy (uniformity) and gray-level cooccurrence matrix (GLCM) homogeneity were higher in the SPGM group than in the 3WSC group (POL SD: at 30 s and 50–300 s; POL entropy: at 0–60 s; EO SD: at 0–600 s; EO entropy: at 0–460 s; POL energy: at 0–40 s; POL GLCM homogeneity: at 0–250 s; EO energy: at 0–360 s; EO GLCM homogeneity: at 0–480 s; all P < .05). Median bubble diameters in the SPGM group and in the 3WSC group were 69 and 83 μm (P < .01), respectively, in the POL foam; and 36 and 36 μm (P = .45), respectively, in the EO foam.ConclusionsPOL and EO foams had greater uniformity and longer foam half-life time when prepared with an SPGM device than with a 3WSC.  相似文献   
14.
目的:探讨基于罗森塔尔效应的护理干预对脑出血后遗症病人的心理状况和生活质量的影响。方法:按照随机数字表法将2019年1月—2021年1月收治的98例脑出血后遗症病人分为对照组和观察组各49例,对照组实施常规护理,观察组在常规护理基础上给予基于罗森塔尔效应的护理干预。干预前后采用卒中量表(NIHSS)、功能独立性评定量表(FIM)、生活活动功能测量量表Barthel指数(BADL)评定两组病人康复情况,采用非精神病性焦虑量表(HADS-A)、非精神病性抑郁量表(HADS-D)、自我效能量表(GSES)评定两组病人心理状态,采用生活质量简明调查表(SF-36)评定两组病人生活质量。结果:观察组病人干预后NIHSS评分低于对照组,FIM和BADL评分高于对照组(P<0.05);观察组病人干预后HADS-A和HADS-D评分低于对照组,GSES评分高于对照组(P<0.05);观察组病人干预后生活质量各维度(躯体功能、躯体角色、肌体疼痛、总体健康、活力、社会功能、情绪角色、心理卫生)评分均明显高于对照组(P<0.05)。结论:基于罗森塔尔效应的护理干预应用于脑出血后遗症病人能有效促进病人康复,改善病人心理状态,提高病人生活质量。  相似文献   
15.
16.
17.
This work describes a measurement method for assessing dose-related image-quality of CT scans based on the difference detail curve (DDC) method, and showcases its use in a low contrast setting. The method is based on a phantom consisting of elliptical slices of different sizes into which contrast object modules can be inserted. These modules contain contrast objects based on (synthetic) resin mixtures with sucrose (native) or sodium iodine (contrast medium). Mixing ratios are provided to achieve a range of clinically relevant CT-numbers with these materials. The phantom is characterized in terms of contrast accuracy, energy dependency and long-term drift with satisfying results. Contrast accuracy and energy dependency are similar to that of water or soft tissue. Image quality of 655 scans of the phantom acquired at 30 different clinical institutions and with 16 different CT scanner models from 4 manufacturers was assessed by calculating a difference detail curve (DDC) from evaluation of up to 5 human observers using a custom-made software (RadiVates) described in this work. Based on these measurements, inter-observer variability was quantified using a bootstrap method and was shown to be a large contributor to the overall variability. This work demonstrates that assessment of CT image quality is feasible with the aforementioned phantom and DDC method.  相似文献   
18.
The aim of this study is to evaluate the prevalence, determinants and prognostic value of pain at diagnosis in patients with desmoid-type fibromatosis (DF). We selected patients from the ALTITUDES cohort (NCT02867033), managed by surgery, active surveillance or systemic treatments, with pain assessment at diagnosis. Patients were invited to fill QLQ-C30 questionnaire and Hospital Anxiety Depression Scale. Determinants were identified using logistic models. Prognostic value on event-free survival (EFS) was evaluated using the Cox model. Overall, 382 patients were included in the current study (median age: 40.2 years; 117 men). The prevalence of pain was 36%, without significant difference according to first-line treatment (P = .18). In the multivariate analysis, pain was significantly associated with tumor size >50 mm (P = .013) and tumor site (P < .001); pain was more frequent in the neck and shoulder locations (odds ratio: 3.05 [1.27-7.29]). Pain at baseline was significantly associated with poor quality of life (P < .001), depression (P = .02), lower performance status (P = .03) and functional impairment (P = .001); we also observed a nonsignificant association with anxiety (P = .10). In the univariate analysis, baseline pain was associated with poor EFS; the 3-year EFS was 54% in patients with pain compared to 72% in those without pain. After adjustment for sex, age, size and line of treatment, pain was still associated with poor EFS (hazard ratio: 1.82 [1.23-2.68], P = .003). One third of recently diagnosed patients with DF experienced pain, especially those with larger tumors and neck/shoulder locations. Pain was associated with unfavorable EFS after adjustment for the confounders.  相似文献   
19.
以华中科技大学同济医学院附属同济医院为例,探讨医院通过健全POCT管理体系,并借助信息平台改进POCT管理的经验,为其他医院POCT规范化管理提供参考。该医院通过搭建POCT管理平台,实现了设备标准化准入、人员资质统一授权、设备自动化质控和诊疗全流程闭环管理;基于信息平台的POCT管理改进,提升了医护人员的POCT认知度和操作水平,提高了医疗工作效率;实行诊疗全程风险管控,保障了医疗安全。  相似文献   
20.
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