全文获取类型
收费全文 | 13629篇 |
免费 | 842篇 |
国内免费 | 70篇 |
专业分类
耳鼻咽喉 | 68篇 |
儿科学 | 348篇 |
妇产科学 | 164篇 |
基础医学 | 986篇 |
口腔科学 | 252篇 |
临床医学 | 1670篇 |
内科学 | 2295篇 |
皮肤病学 | 154篇 |
神经病学 | 587篇 |
特种医学 | 218篇 |
外科学 | 1103篇 |
综合类 | 1665篇 |
预防医学 | 2188篇 |
眼科学 | 173篇 |
药学 | 1196篇 |
6篇 | |
中国医学 | 985篇 |
肿瘤学 | 483篇 |
出版年
2024年 | 76篇 |
2023年 | 348篇 |
2022年 | 644篇 |
2021年 | 780篇 |
2020年 | 694篇 |
2019年 | 1336篇 |
2018年 | 996篇 |
2017年 | 561篇 |
2016年 | 332篇 |
2015年 | 372篇 |
2014年 | 846篇 |
2013年 | 735篇 |
2012年 | 657篇 |
2011年 | 701篇 |
2010年 | 529篇 |
2009年 | 490篇 |
2008年 | 416篇 |
2007年 | 350篇 |
2006年 | 282篇 |
2005年 | 211篇 |
2004年 | 134篇 |
2003年 | 112篇 |
2002年 | 77篇 |
2001年 | 80篇 |
2000年 | 61篇 |
1999年 | 44篇 |
1998年 | 27篇 |
1997年 | 25篇 |
1996年 | 24篇 |
1995年 | 27篇 |
1994年 | 21篇 |
1993年 | 9篇 |
1992年 | 5篇 |
1991年 | 8篇 |
1989年 | 13篇 |
1988年 | 7篇 |
1987年 | 8篇 |
1985年 | 205篇 |
1984年 | 297篇 |
1983年 | 270篇 |
1982年 | 265篇 |
1981年 | 260篇 |
1980年 | 200篇 |
1979年 | 197篇 |
1978年 | 140篇 |
1977年 | 147篇 |
1976年 | 170篇 |
1975年 | 140篇 |
1974年 | 102篇 |
1973年 | 98篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
【目的】 值此《中国科技期刊研究》创刊30周年之际,思考科研评价体系的改变给中文科技期刊带来的影响,为中文期刊探寻发展路径。【方法】 结合对中文科技期刊困境的研究,提出应对策略。【结果】 近期国家陆续出台的纠偏评价导向的政策文件,为中文科技期刊既带来了发展机遇,也提出了挑战。【结论】 在重构符合中文科技期刊发展特点的评价体系的基础上,中文科技期刊应明确目标定位,面向国家需求,提升知识服务能力,建立品牌特色。 相似文献
4.
慢性鼻窦炎(CRS)是一种常见的慢性非特异感染性鼻部疾病,病理分型主要分为Th2细胞介导的嗜酸性粒细胞性鼻窦炎(ECRS)和Th1细胞介导的非嗜酸性粒细胞性鼻窦炎(非ECRS)2种表型。欧洲国家CRS患病人群主要表现为ECRS,而随着亚洲国家的急剧工业化发展,其ECRS的比例也在急剧增加。ECRS发病机制复杂,涉及多种免疫细胞和相关因子相互作用。其治疗方法包括抗生素、激素药物治疗及手术治疗等,但仍有部分患者症状难以改善或存在复发的风险。Ⅱ型固有淋巴样细胞(ILC2s)是一种非B、非T的新型淋巴细胞,与Th2免疫应答关系密切。文章就ILC2s在ECRS发病机制中的作用进行综述,以期为ECRS的诊断和治疗提供理论参考。 相似文献
5.
《JACC: Cardiovascular Interventions》2022,15(12):1205-1215
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
6.
《Revista espa?ola de cardiología》2019,72(12):1012-1019
Introduction and objectivesThe Spanish Society of Cardiology/Spanish Heart Foundation (SEC/FEC) annually awards grants for cardiovascular research projects. Our objective was to analyze the trend in these investments and their resulting scientific production from 2007 to 2012.MethodsA search of the publications funded by the SEC/FEC was carried out, according to the following inclusion criteria: publication in a journal indexed in MEDLINE or EMBASE, publication date after the grant, authorship by the principal investigator of the grant, and acknowledgment of SEC/FEC funding. The impact factor and subsequent citations of the articles were analyzed (Web of Science).ResultsA total of 235 grants were awarded (39/y) with an allocation of €3 854 300 (€642 383/y), 37% of them to women. In all, 122 publications resulted from 88 research projects (37%) funded by the SEC/FEC. Up to October 2017, these publications had received 2258 citations in subsequent studies in the Web of Science, with a mean of 18.5 and a median of 8 citations/study.ConclusionsDespite the economic crisis, the mean number and size of the grants awarded by the SEC/FEC increased in the period analyzed. Grants were awarded on an equal opportunity basis to men and women. The bibliometric impact of the funded projects is acceptable, although efforts should be made to improve it. 相似文献
7.
目的 系统评价有关癌症患者心理韧性发展的真实体验,为更好地制定心理韧性干预方案提供理论依据。方法 计算机检索Cochrane Library、Medline、CINAHL、Embase、PubMed、Web of Science、Psyc INFO以及中国生物医学文献数据库、中国知网、维普、万方数据库从建库至2019年6月相关的质性研究。采用澳大利亚乔安娜布里格斯研究所循证卫生保健中心质性研究质量评价标准(2016)对文献进行评价,采用汇集性整合方法进行结果整合。结果 共纳入10篇文献,提炼42个明确的结果,形成8个类别,汇总成3个整合结果。①心理韧性发展是动态循环的过程:危机负性期,调节成长期,积极转化期,循环强化期;②心理韧性的阻碍因素:个体(消极应对,错误认知,症状和体象困扰),环境(传统社会文化,医疗环境,家庭负担);③心理韧性的保护因素:个体(积极心理与应对方式,复原经历,宗教信仰,自我表露,利他主义与行为),环境(家庭因素,医疗照护,人际支持)。结论 心理韧性的发展是动态循环过程,受个体和环境因素影响,医护人员应根据不同阶段的影响因素给予针对性护理措施,促进患者心理韧性的形成和发展,提高患者的生活质量。 相似文献
8.
本文综述了近10年来黄栌中漆黄索的提取工艺和测定方法的研究进展,并对各种提取工艺和测定方法进行了评价。为更好地开发利用漆黄素提供参考。 相似文献
9.
《中华骨科杂志》2002-2004年引文分析 总被引:2,自引:0,他引:2
目的研究《中华骨科杂志》文献引用规律及我国骨科学研究领域科研人员的文献利用与需求特征。方法利用引文计量分析法,统计《中华骨科杂志》2002-2004年间刊载的614篇论文所引用的参考文献。结果614篇论文中,有引文的论文共565篇,引文率为92.02%,篇均引文11.66条;引文中期刊6672条(93.22%),图书451条(6.30%);普赖斯指数45.44%,期刊自引361条,自引率5.04%。被引用频次居前20位的中、外文期刊的引文量占总引用期刊引文量的53.30%。结论《中华骨科杂志》涉猎文献范围广,引文类型以期刊为主,语种以英文文献为主,引文的外文语种结构较为单一,研究引用文献比较滞后,文献半衰期较长,专业人员利用近5年内新文献的能力有待于进一步提高。 相似文献
10.
Nuttan K. Tanna 《Pharmacy World & Science》2005,27(1):4-6
The evaluation of healthcare practice and service delivery is fraught with difficulties. Service development and / or delivery occurs within socially dynamic settings which are in a continual state of change. Service development also often involves large elements of improvisation. The action research approach is useful for health service research, as it supports collaboration between researchers and practitioners, and not only allows but makes explicit that the action researcher has both roles within the setting being studied. This paper discusses action research methodology and offers insight into principles that favor its use for service delivery development. This includes consideration of the interactive variables within studies of health care systems and the importance of
evaluating relationships between stakeholders to understand how these factors or variables, which cannot be controlled for, are responsible for successful development of the service. Action research facilitates change and helps bridge the heory--practice gap. With the current dynamic changes within both the pharmacy profession and national health services, researchers may find the action research technique of value
when considering new roles and innovative ways of engaging in collaborative, multi-disciplinary working to improve delivery of patient care.Accepted july 2004 相似文献