全文获取类型
收费全文 | 30980篇 |
免费 | 484篇 |
国内免费 | 23篇 |
专业分类
教育 | 22342篇 |
科学研究 | 2711篇 |
各国文化 | 362篇 |
体育 | 2382篇 |
综合类 | 17篇 |
文化理论 | 277篇 |
信息传播 | 3396篇 |
出版年
2022年 | 206篇 |
2021年 | 309篇 |
2020年 | 461篇 |
2019年 | 743篇 |
2018年 | 1020篇 |
2017年 | 1026篇 |
2016年 | 910篇 |
2015年 | 586篇 |
2014年 | 853篇 |
2013年 | 6326篇 |
2012年 | 791篇 |
2011年 | 817篇 |
2010年 | 634篇 |
2009年 | 633篇 |
2008年 | 721篇 |
2007年 | 669篇 |
2006年 | 596篇 |
2005年 | 581篇 |
2004年 | 530篇 |
2003年 | 496篇 |
2002年 | 481篇 |
2001年 | 595篇 |
2000年 | 514篇 |
1999年 | 487篇 |
1998年 | 309篇 |
1997年 | 321篇 |
1996年 | 351篇 |
1995年 | 371篇 |
1994年 | 297篇 |
1993年 | 298篇 |
1992年 | 424篇 |
1991年 | 394篇 |
1990年 | 392篇 |
1989年 | 398篇 |
1988年 | 344篇 |
1987年 | 392篇 |
1986年 | 344篇 |
1985年 | 399篇 |
1984年 | 345篇 |
1983年 | 300篇 |
1982年 | 292篇 |
1981年 | 241篇 |
1980年 | 202篇 |
1979年 | 325篇 |
1978年 | 252篇 |
1977年 | 244篇 |
1976年 | 216篇 |
1975年 | 195篇 |
1974年 | 204篇 |
1973年 | 183篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
John F. Fox Jr. 《Journal of Government Information》2004,30(4):470-481
This paper addresses several misunderstandings about the nature of the FBI's Central Records System. Although depicted in popular culture and much of FBI historiography as a tool for the Cold War suppression of American radicals, the FBI's records system grew out of Department of Justice systems already in place before J. Edgar Hoover became Director in 1924. The system grew in size and complexity according to the demands placed on it by the changing priorities of the FBI's criminal and intelligence missions, guided by a “progressive” drive for efficiency through centralization. 相似文献
142.
143.
144.
John Davies 《信息系统工程》2005,(10):36-37
当您每年要向中国数千个地方发送1600万个包裹时,很多问题都可能出现。只要有百分之一的包裹被标示错误,就会有16万个包裹迷失目的地,势必引来大群客户的抱怨。 相似文献
145.
John Roberts 《Archival Science》2005,5(2-4):185-201
Both macroappraisal and the Australian records continuum-based DIRKS methodology have been influential in the New Zealand
debate on appraisal in recent years. The primary influence of macroappraisal has been in the area of prioritisation of appraisal
work. This paper considers New Zealand thinking on prioritisation, and the influences of risk management and functional analysis
on this issue. A lack of agreement on the purpose of appraisal in the professional literature is noted, and some personal
suggestions are offered on a model taking elements from macroappraisal and other methodologies. 相似文献
146.
147.
Kristine M Alpi 《Journal of the Medical Library Association》2005,93(1):97-103
OBJECTIVE: The article explores the characteristics of public health information needs and the resources available to address those needs that distinguish it as an area of searching requiring particular expertise. METHODS: Public health searching activities from reference questions and literature search requests at a large, urban health department library were reviewed to identify the challenges in finding relevant public health information. RESULTS: The terminology of the information request frequently differed from the vocabularies available in the databases. Searches required the use of multiple databases and/or Web resources with diverse interfaces. Issues of the scope and features of the databases relevant to the search questions were considered. CONCLUSION: Expert searching in public health differs from other types of expert searching in the subject breadth and technical demands of the databases to be searched, the fluidity and lack of standardization of the vocabulary, and the relative scarcity of high-quality investigations at the appropriate level of geographic specificity. Health sciences librarians require a broad exposure to databases, gray literature, and public health terminology to perform as expert searchers in public health. 相似文献
148.
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
149.
150.
ABSTRACTLighting a cultural heritage artifact requires balancing visual perception with preventive conservation, by providing the best lighting (in terms of spectral distribution and quantity) to enable the viewer to appreciate details and color, while limiting photo-induced degradation. The paper outlines the methodology applied by a multi-disciplinary team while lighting the Shroud of Turin at its last public exhibition in 2015. The methodology considered the special requirements of the Shroud, including exposure to ultraviolet light, while providing appropriate display conditions that would meet audience expectations. The desired appearance (readability of the body image and color) was defined with the help of Shroud researchers and confirmed by subjective tests, while appropriate light levels for preservation were set in agreement with standard requirements and using knowledge of the degradation of linen in visible and UV light. The installation provided a controlled environment and a managed visitor route to the Shroud, assuring excellent perception of both details and color, with the lowest illuminance level about 15?lx. 相似文献