全文获取类型
收费全文 | 68947篇 |
免费 | 7564篇 |
国内免费 | 962篇 |
专业分类
耳鼻咽喉 | 327篇 |
儿科学 | 1060篇 |
妇产科学 | 1128篇 |
基础医学 | 2574篇 |
口腔科学 | 1274篇 |
临床医学 | 16047篇 |
内科学 | 5078篇 |
皮肤病学 | 357篇 |
神经病学 | 2018篇 |
特种医学 | 856篇 |
外国民族医学 | 2篇 |
外科学 | 7853篇 |
综合类 | 10184篇 |
现状与发展 | 4篇 |
一般理论 | 26篇 |
预防医学 | 16607篇 |
眼科学 | 361篇 |
药学 | 5737篇 |
184篇 | |
中国医学 | 4124篇 |
肿瘤学 | 1672篇 |
出版年
2024年 | 117篇 |
2023年 | 1726篇 |
2022年 | 2313篇 |
2021年 | 3793篇 |
2020年 | 4535篇 |
2019年 | 3326篇 |
2018年 | 3073篇 |
2017年 | 3196篇 |
2016年 | 3091篇 |
2015年 | 2982篇 |
2014年 | 5863篇 |
2013年 | 6094篇 |
2012年 | 4828篇 |
2011年 | 4938篇 |
2010年 | 3951篇 |
2009年 | 3382篇 |
2008年 | 3449篇 |
2007年 | 3106篇 |
2006年 | 2809篇 |
2005年 | 2090篇 |
2004年 | 1760篇 |
2003年 | 1472篇 |
2002年 | 1016篇 |
2001年 | 822篇 |
2000年 | 734篇 |
1999年 | 519篇 |
1998年 | 490篇 |
1997年 | 387篇 |
1996年 | 292篇 |
1995年 | 224篇 |
1994年 | 181篇 |
1993年 | 172篇 |
1992年 | 111篇 |
1991年 | 108篇 |
1990年 | 89篇 |
1989年 | 63篇 |
1988年 | 56篇 |
1987年 | 44篇 |
1986年 | 39篇 |
1985年 | 58篇 |
1984年 | 33篇 |
1983年 | 30篇 |
1982年 | 23篇 |
1981年 | 22篇 |
1980年 | 24篇 |
1979年 | 8篇 |
1978年 | 10篇 |
1977年 | 6篇 |
1976年 | 4篇 |
1974年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
1.
2.
《Journal of pediatric surgery》2023,58(9):1613-1617
BackgroundThe goal of this study was to characterize contemporary performance benchmarks and risk factors associated with negative appendectomy (NA) in children with suspected appendicitis.MethodsA multicenter retrospective cohort analysis of children undergoing appendectomy for suspected appendicitis was performed using data from the 2016–2021 NSQIP-Pediatric Appendectomy Targeted Public Use Files. Multivariable regression was used to evaluate the influence of year, age, sex, and WBC count on NA rate, and to generate rate estimates for NA based on different combinations of demographic characteristics and WBC profiles.Results100,322 patients were included from 140 hospitals. The overall NA rate was 2.4%, and rates decreased significantly during the study period (2016: 3.1% vs. 2021: 2.3%, p < 0.001). In adjusted analyses, the highest risk for NA was associated with a normal WBC (<9000/mm3; OR 5.31 [95% CI: 4.87–5.80]), followed by female sex (OR 1.55 [95% CI: 1.42–1.68]) and age <5 years (OR 1.64 [95% CI 1.39, 1.94]). Model-estimated risk for NA varied significantly across demographic and WBC strata, with a 14.4-fold range in rates between subgroups with the lowest and highest predicted risk (males 13–17 years with elevated WBC [1.1%] vs. females 3–4 years with normal WBC [15.8%]).ConclusionsContemporary NA rates have decreased over time, however NA risk remains high in children without a leukocytosis, particularly for girls and children <5 years of age. These data provide contemporary performance benchmarks for NA in children with suspected appendicitis and identify high-risk populations where further efforts to mitigate NA risk should be targeted.Level of EvidenceIII. 相似文献
3.
目的:通过中英文文献了解结直肠癌患者生命质量研究现状及发展趋势。方法:运用CiteSpace对中国知网(CNKI)、万方数据知识服务平台、中国生物医学文献数据库、Web of Science核心数据集、PubMed、Cochrane Library中收录的关于结直肠癌患者生命质量研究的中英文文献进行可视化分析。结果:检索得到中文文献1 285篇,英文文献871篇,中英文文献发文量均呈上升趋势,相关研究关注的重点主要是结直肠癌患者造口、抑郁、免疫、肠道功能、化疗及化疗药物,但机构之间、学者之间合作程度及研究类型等方面存在一定差异。结论:中文文献相关研究起步晚、发展快,但在研究质量与研究深度等方面与英文文献相比还有一定差距;国内学者之间、机构之间应加强合作,关心患者肠道功能、心理状况,提高患者体力活动水平,开展更多高质量研究。 相似文献
4.
5.
6.
AimThe aim of the study was to describe the characteristics of the Bachelor’s thesis of fourth-year nursing students at a Spanish public university, the criteria that students used to choose a topic and students’ degree of satisfaction after completing the Bachelor’s thesis.DesignQuantitative study.MethodsWe examined 420 Bachelor’s theses carried out from 2013 to 2018 and conducted an online survey among fourth-year students in the 2017–18 and 2018–19 academic years (81 completed questionnaires).ResultsThe Bachelor’s thesis took the form of a research proposal. The most frequent proposal type was a qualitative hospital-based study whose objective was to understand the experiences of adult or adolescent patients, close family members, or nurses. Students chose topics for personal reasons. Most participants reported feeling satisfied with the knowledge and skills acquired.ConclusionsStudents completing a Bachelor’s thesis in the form of a research proposal have the potential to transfer their research skills to their nursing practice. 相似文献
7.
8.
目的研究风险管理在儿科急诊护理工作中的应用。方法选取2021年10月至12月间来我科室就诊的100例患儿作为研究对象,将其分为研究组、对照组两组,每组各50例患儿。运用常规护理模式护理对照组患儿,运用风险管理模式,为研究组患儿给予护理干预,分析二组发生不良护理事故的情况并统计护理满意度。结果研究期间,研究组不良护理事件发生率为2.0%,对照组不良护理事件发生率为12.0%;研究组对护理工作的满意度为98.0%,对照组对护理工作的满意度为84.0%,P<0.05,组间差异具统计学意义。结论将风险管理应用于儿科急诊护理工作,可降低不良事件发生几率,保障患儿安全,具有推广应用价值。 相似文献
9.
The research and development of penicillin started with difficulty before 1949 and achieved certain results. In 1951, after the founding of the People's Republic of China, Zhang Weishen, as the only Chinese scientist who had been trained and worked in a penicillin research and development center in the United States for many years, overcame many difficulties and returned to China. In 1953, with the efforts of Zhang Weishen and his colleagues, China realized the industrialized production of penicillin, alleviating the urgent needs of the masses. Antibiotics has also become the first discipline to achieve major scientific and technological achievements after the founding of the New China. In the mid-1950s, the technical breakthrough in the localization of lactose substitutes marked the localization of the raw materials of the penicillin-producing culture medium, which paved the way for the industrialized production of penicillin with Chinese characteristics. Antibiotics have become one of the most widely used and affordable drugs for hundreds of millions of patients in China, and China has since ended the humiliating history of the “Sick Man of East Asia". 相似文献
10.
《Journal of Radiology Nursing》2022,41(2):123-128
ObjectiveThe objective of this study was to reduce errors in a pathologic specimen with the help of a protocol systematizing the pathology specimen management process in the operating room.Materials and methodThis quasi-experimental study was carried out in the operating room unit of a research and training hospital. A protocol systematizing the process of specimen management in secure surgical pathology and prepared in light of the current literature was used as an intervention, and the effectiveness of the protocol was tested.ResultsIt was determined that the rate of adverse events decreased from .3226% (68 of 21,078) to .032% (6 of 18,706) after the protocol systematizing the surgical pathology specimen management process prepared by the researchers, and the protocol was found to be effective by 90% (P = .03).ConclusionBased on the data obtained in this study, we recommend the use of a pathologic specimen management protocol in the operating room. 相似文献