全文获取类型
收费全文 | 224499篇 |
免费 | 17889篇 |
国内免费 | 5574篇 |
专业分类
耳鼻咽喉 | 1829篇 |
儿科学 | 3341篇 |
妇产科学 | 3235篇 |
基础医学 | 26799篇 |
口腔科学 | 4361篇 |
临床医学 | 18887篇 |
内科学 | 34739篇 |
皮肤病学 | 2975篇 |
神经病学 | 13694篇 |
特种医学 | 7164篇 |
外国民族医学 | 2篇 |
外科学 | 18970篇 |
综合类 | 31540篇 |
现状与发展 | 31篇 |
一般理论 | 11篇 |
预防医学 | 17482篇 |
眼科学 | 2637篇 |
药学 | 29396篇 |
91篇 | |
中国医学 | 16649篇 |
肿瘤学 | 14129篇 |
出版年
2024年 | 403篇 |
2023年 | 3186篇 |
2022年 | 5123篇 |
2021年 | 9651篇 |
2020年 | 8153篇 |
2019年 | 7996篇 |
2018年 | 7876篇 |
2017年 | 8715篇 |
2016年 | 8929篇 |
2015年 | 8517篇 |
2014年 | 10354篇 |
2013年 | 14755篇 |
2012年 | 11750篇 |
2011年 | 13864篇 |
2010年 | 9156篇 |
2009年 | 9058篇 |
2008年 | 10363篇 |
2007年 | 11481篇 |
2006年 | 10723篇 |
2005年 | 9822篇 |
2004年 | 8324篇 |
2003年 | 7433篇 |
2002年 | 5980篇 |
2001年 | 5363篇 |
2000年 | 4477篇 |
1999年 | 3745篇 |
1998年 | 2945篇 |
1997年 | 3055篇 |
1996年 | 2799篇 |
1995年 | 2469篇 |
1994年 | 2374篇 |
1993年 | 1998篇 |
1992年 | 1794篇 |
1991年 | 1674篇 |
1990年 | 1439篇 |
1989年 | 1191篇 |
1988年 | 1125篇 |
1987年 | 1022篇 |
1986年 | 946篇 |
1985年 | 1371篇 |
1984年 | 1093篇 |
1983年 | 827篇 |
1982年 | 858篇 |
1981年 | 732篇 |
1980年 | 662篇 |
1979年 | 519篇 |
1978年 | 343篇 |
1977年 | 298篇 |
1976年 | 274篇 |
1975年 | 198篇 |
排序方式: 共有10000条查询结果,搜索用时 484 毫秒
161.
《Journal of Medical Imaging and Radiation Sciences》2020,51(1):173-181
IntroductionThis study aims to construct learning curves related to the realization of standardized postprocessing by radiographer students and to discuss their exploitation and interest.Materials and MethodsThis study was carried out in 21 French students in their 3rd year of training. Two postprocessing protocols in CT (#1 traumatic shoulder; #2 petrous bone) were repeated 15 times by each student. Each achievement was timed to obtain overall learning curves. The realization accuracy was also assessed for each student at each repetition.ResultsThe learning rates for the two protocols are 63% and 56%, respectively. The number of repetitions to reach the reference time for each protocol is 11 and 12, respectively. In both protocols, the standard deviations are significantly reduced and stabilized during repetitions. The mean accuracy progresses more quickly in protocol #1.DiscussionThe measured learning rates reflect a rapid learning process for each protocol. The analysis of the standard deviations shows that students have reached a homogeneous level. The average times and accuracies measured during the last repetitions show that the group has reached a high level of performance. Building learning curves helps students measure their progress and motivates them.ConclusionObtaining learning curves allows trainers/supervisors to qualify the learning difficulty of a task while motivating students/radiographers. The use of learning curves is inline with the competency-based training paradigm. 相似文献
162.
目的:分析延续护理干预对慢性乙型肝炎患者抗病毒治疗依从性的影响。方法:研究选取2017年1月~2017年12月某院肝二病区收治的112例乙型肝炎患者和2018年1月~2018年12月收治的98例乙型肝炎病毒患者作为研究对象,所有患者均进行抗病毒治疗,回顾性分析患者的病历资料。将2017年收治的112例患者作为常规组实施常规护理,将2018年收治的98例患者的作为研究组实施延续性护理,比较两组的护理效果。结果:研究组的治疗依从率为93.88%(92例),远高于常规组的77.68%(87例),两组数据比较存在统计学意义(P<0.05)。结论:延续性护理措施可以有效提高慢性乙型肝炎抗病毒治疗的依从性,可以在临床中推广使用。 相似文献
163.
Su Jeong Seong Jin Pyo Hong Bong-Jin Hahm Hong Jin Jeon Jee Hoon Sohn Jun Young Lee Maeng Je Cho 《Journal of Korean medical science》2015,30(11):1675-1681
While decreasing trend in gender differences in alcohol use disorders was reported in Western countries, the change in Asian countries is unknown. This study aims to explore the shifts in gender difference in alcohol abuse (AA) and dependence (AD) in Korea. We compared the data from two nation-wide community surveys to evaluate gender differences in lifetime AA and AD by Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV). Face-to-face interviews using the Composite International Diagnostic Interview (CIDI) were applied to all subjects in 2001 (n=6,220) and 2011 (n=6,022). Male-to-female ratio of odds was decreased from 6.41 (95% CI, 4.81-8.54) to 4.37 (95% CI, 3.35-5.71) for AA and from 3.75 (95% CI, 2.96-4.75) to 2.40 (95% CI, 1.80-3.19) for AD. Among those aged 18-29, gender gap even became statistically insignificant for AA (OR, 1.59; 95% CI, 0.97-2.63) and AD (OR, 1.18; 95% CI, 0.80-2.41) in 2011. Men generally showed decreased odds for AD (0.55; 95% CI, 0.45-0.67) and women aged 30-39 showed increased odds for AA (2.13; 95% CI 1.18-3.84) in 2011 compared to 2001. Decreased AD in men and increased AA in women seem to contribute to the decrease of gender gap. Increased risk for AA in young women suggests needs for interventions. 相似文献
164.
165.
166.
167.
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
168.
169.
170.