全文获取类型
收费全文 | 11174篇 |
免费 | 115篇 |
国内免费 | 7篇 |
专业分类
教育 | 7533篇 |
科学研究 | 1313篇 |
各国文化 | 351篇 |
体育 | 778篇 |
综合类 | 5篇 |
文化理论 | 81篇 |
信息传播 | 1235篇 |
出版年
2021年 | 102篇 |
2020年 | 136篇 |
2019年 | 198篇 |
2018年 | 253篇 |
2017年 | 280篇 |
2016年 | 249篇 |
2015年 | 170篇 |
2014年 | 221篇 |
2013年 | 2102篇 |
2012年 | 229篇 |
2011年 | 225篇 |
2010年 | 204篇 |
2009年 | 205篇 |
2008年 | 271篇 |
2007年 | 259篇 |
2006年 | 212篇 |
2005年 | 190篇 |
2004年 | 205篇 |
2003年 | 150篇 |
2002年 | 158篇 |
2001年 | 172篇 |
2000年 | 203篇 |
1999年 | 194篇 |
1998年 | 106篇 |
1997年 | 108篇 |
1996年 | 101篇 |
1995年 | 86篇 |
1993年 | 100篇 |
1992年 | 166篇 |
1991年 | 161篇 |
1990年 | 170篇 |
1989年 | 173篇 |
1988年 | 135篇 |
1987年 | 135篇 |
1986年 | 137篇 |
1985年 | 181篇 |
1984年 | 138篇 |
1983年 | 132篇 |
1982年 | 119篇 |
1981年 | 96篇 |
1980年 | 112篇 |
1979年 | 163篇 |
1978年 | 113篇 |
1977年 | 102篇 |
1976年 | 98篇 |
1975年 | 90篇 |
1974年 | 103篇 |
1973年 | 99篇 |
1971年 | 88篇 |
1968年 | 82篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Zuckerman: Scientist Extraordinary by Bernard Donovan BioScientifica, Bristol, 2005, 555pp. ISBN 1‐901978249 £24.95 Negotiating licences for digital resources by Fiona Durrant Facet Publishing, 2006, ISBN 1 85604 586 2 Metadata for Information Management and Retrieval By David Haynes Facet Publishing, 2004, ISBN 1 85604 4890 相似文献
32.
This article explores the evolution of the role of academic journal articles submitted to the UK's Research Assessment Exercise (RAE). By reviewing their role, it is possible to see how the changes from quantitative to qualitative assessment (and the resulting problems surrounding the definition of ‘quality’ journals) has impacted both on the journals selected by academics for publishing their research and the assessment of them. Although only one part of RAE submissions, the listing of published research outputs provides the primary evidence for research quality to most RAE panels, and is a significant driver of the final grade awarded, and thus the funding received by submitting institutions. The RAE, being a peer‐reviewed assessment exercise, mirrors in some ways the peer‐review process immured within scholarly publication. The developing role of journal publications as a vehicle for academic research output is examined via the chronology of the RAE, before assessing the current situation in which published journal output formed almost 70% of all output assessed by RAE panels in the latest exercise. The impact of this increased importance of academic journals in the assessment process is considered not only for academics but also for the wider community, i.e. publishers and libraries. 相似文献
33.
Linda M Hartman Rebecca A Abromitis Alice B Kuller Barbara A Epstein 《Journal of the Medical Library Association》2005,93(2):271-277
OBJECTIVE: A staff development committee (SDC) was convened to implement staff development opportunities for an academic health sciences library system comprised of three separate facilities. The charge for the SDC was to: (1) develop programs to enhance workplace skills and personal growth, (2) communicate the availability of existing programs at the university and medical center, and (3) encourage the staff to participate in these opportunities. PROGRAM: The committee created goals and objectives and developed a survey designed to give staff the opportunity to provide input for this initiative. With an 80% response rate, the survey results were used to plan 15 events based on staff needs and preferences. First-year attendance for SDC-sponsored events was 459. Committee members served as liaisons for each event. Two forms were developed to facilitate event planning. A monthly announcement sheet, email reminders, and the library's local area network are used to communicate upcoming SDC events and encourage attendance. CONCLUSION: This approach can serve as a useful model for similar program planning in any organization. 相似文献
34.
I. V. Zibareva L. Yu. Ilina B. L. Alperin 《Scientific and Technical Information Processing》2018,45(2):106-109
The current state of the Russian Science Citation Index is analyzed. Several areas for its further development identified by long-standing active users, such as data searching, refinement, and storage; current user alerts; data input with the Science Index license; patent information; and the application programming interface (API) are investigated. 相似文献
35.
Critical communication pedagogy and service learning in a mixed-method communication research course
ABSTRACTCourse: Mixed-Method Communication Research MethodsObjective: The purpose of this semester-long activity is to provide students with opportunities to cultivate mixed-method communication research skills through a social justice-informed service-learning format. Completing this course, students will be able to: recognize the unique strengths of quantitative and qualitative research methods; locate, evaluate, and utilize scholarly literature for a literature review; conduct an original research project using quantitative and qualitative research methods to gather and analyze data; and raise self and community awareness about a social issue through collaboration with a community organization. 相似文献
36.
37.
38.
39.
40.
Eric R. Muoz Jaclyn B. Caccese Brittany E. Wilson Kyle T. Shuler Fernando V. Santos Carolina T. Cabn John J. Jeka Dianne Langford Matthew B. Hudson 《运动与健康科学(英文)》2021,10(2):122-130
BackgroundConsidering the potential cumulative effects of repetitive head impact (HI) exposure, we need sensitive biomarkers to track short- and long-term effects. Circulating small extracellular vesicles (sEVs) (<200 nm) traffic biological molecules throughout the body and may have diagnostic value as biomarkers for disease. The purpose of this study was to identify the microRNA (miRNA) profile in circulating sEVs derived from human plasma following repetitive HI exposure.MethodsHealthy adult (aged 18–35 years) soccer players were randomly assigned to one of 3 groups: the HI group performed 10 standing headers, the leg impact group performed 10 soccer ball trapping maneuvers over 10 min, and the control group did not participate in any soccer drills. Plasma was collected before testing and 24 h afterward, and sEVs were isolated and characterized via nanoparticle tracking analysis. Next-generation sequencing was utilized to identify candidate miRNAs isolated from sEVs, and candidate microRNAs were analyzed via quantitative polymerase chain reaction. In silico target prediction was performed using TargetScan (Version 7.0; targetscan.org) and miRWalk (http://mirwalk.umm.uni-heidelberg.de/) programs, and target validation was performed using luciferase reporter vectors with a miR-7844-5p mimic in human embryonic kidney (HEK) 293T/17 cells.ResultsPlasma sEV concentration and size were not affected across time and group following repetitive HI exposure. After 24 h, the HI read count from next-generation sequencing showed a 4-fold or greater increase in miR-92b-5p, miR-423-5p, and miR-24-3p and a 3-fold or greater decrease in miR-7844-5p, miR-144-5p, miR-221-5p, and miR-22-3p. Analysis of quantitative polymerase chain reaction revealed that leg impact did not alter the candidate miRNA levels. To our knowledge, miR-7844-5p is a previously unknown miRNA. We identified 8 miR-7844-5p mRNA targets: protein phosphatase 1 regulatory inhibitor subunit 1B (PPP1R1B), LIM and senescent cell antigen-like domains 1 (LIMS1), autophagy-related 12 (ATG12), microtubule-associated protein 1 light chain 3 beta (MAP1LC3B), integrin subunit alpha-1 (ITGA1), mitogen-activated protein kinase 1 (MAPK1), glycogen synthase kinase 3β (GSK3β), and mitogen-activated protein kinase 8 (MAPK8).ConclusionCollectively, these data indicate repetitive HI exposure alters plasma sEV miRNA content, but not sEV size or number. Furthermore, for the first time we demonstrate that previously unknown miR-7844-5p targets mRNAs known to be involved in mitochondrial apoptosis, autophagy regulation, mood disorders, and neurodegenerative disease. 相似文献