全文获取类型
收费全文 | 17621篇 |
免费 | 195篇 |
国内免费 | 20篇 |
专业分类
教育 | 11839篇 |
科学研究 | 2056篇 |
各国文化 | 400篇 |
体育 | 1517篇 |
综合类 | 7篇 |
文化理论 | 137篇 |
信息传播 | 1880篇 |
出版年
2021年 | 185篇 |
2020年 | 239篇 |
2019年 | 362篇 |
2018年 | 481篇 |
2017年 | 472篇 |
2016年 | 441篇 |
2015年 | 278篇 |
2014年 | 357篇 |
2013年 | 3056篇 |
2012年 | 395篇 |
2011年 | 388篇 |
2010年 | 360篇 |
2009年 | 331篇 |
2008年 | 398篇 |
2007年 | 363篇 |
2006年 | 348篇 |
2005年 | 314篇 |
2004年 | 333篇 |
2003年 | 232篇 |
2002年 | 237篇 |
2001年 | 293篇 |
2000年 | 305篇 |
1999年 | 273篇 |
1998年 | 173篇 |
1997年 | 167篇 |
1996年 | 159篇 |
1995年 | 129篇 |
1994年 | 127篇 |
1993年 | 173篇 |
1992年 | 244篇 |
1991年 | 259篇 |
1990年 | 261篇 |
1989年 | 245篇 |
1988年 | 209篇 |
1987年 | 218篇 |
1986年 | 209篇 |
1985年 | 253篇 |
1984年 | 217篇 |
1983年 | 210篇 |
1982年 | 194篇 |
1981年 | 154篇 |
1980年 | 165篇 |
1979年 | 240篇 |
1978年 | 178篇 |
1977年 | 169篇 |
1976年 | 150篇 |
1975年 | 135篇 |
1974年 | 155篇 |
1973年 | 142篇 |
1971年 | 131篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
John B. Bishop 《Journal of College Student Psychotherapy》2016,30(4):226-231
The author offers his perspectives about the experiences that are associated with being a college or university counseling center director. 相似文献
995.
Vlachopoulos SP Kaperoni M Moustaka FC Anderson DF 《Research quarterly for exercise and sport》2008,79(3):283-299
The present study reported on translating the Exercise Identity Scale (EIS: Anderson & Cychosz, 1994) into Greek and examining its psychometric properties and cross-cultural validity based on U.S. individuals' EIS responses. Using four samples comprising 33, 103, and 647 Greek individuals, including exercisers and nonexercisers, and a similar sample comprising 800 U.S. individuals, the concurrent validity, factor structure, internal reliability, test-retest reliability, external validity, gender invariance, and cross-cultural validity of the EIS responses were examined using confirmatory factor analytical procedures. The results supported the concurrent validity, an adequate unidimensional factor structure for the translated EIS and the internal reliability and test-retest reliability over a 6-week interval. Further, cross-gender configural, partial metric, partial strong factorial, and partial strict factorial invariance and cross-cultural configural and partial metric invariance supported the cross-cultural equivalence of the EIS versions. Moreover, the external validity of the translated EIS responses was also supported. Overall, the findings supported the validity of the exercise identity construct outside North American boundaries and the EIS items' equivalence, providing initial evidence for its cross-cultural applicability. 相似文献
996.
Gary F. Hansen 《Research quarterly for exercise and sport》2013,84(4):585-592
Abstract This study was made to determine the influence of five selected motive-incentive conditions upon the effectiveness of a 6-week isometric training program for the development of strength in the elbow flexor muscle group. Data were obtained from an initial test, from each training session, and from a final test. The mean gains in best strength scores from the initial to the final test were statistically significant (p = .05) for all five motive-incentive groups. No significant differences (p = .05) were found between the mean of the scores for the five motive inventive groups obtained during the first training session, during the last training session, from the final test, and from the cumulative scores for the 12 training sessions. 相似文献
997.
Sallis JF Calfas KJ Nichols JF Sarkin JA Johnson MF Caparosa S Thompson S Alcaraz JE 《Research quarterly for exercise and sport》1999,70(1):1-10
Project GRAD (Graduate Ready for Activity Daily) evaluates a university course to promote physical activity. In a randomized study, 338 university seniors participated in either an intervention or control course for academic credit, and posttest data were collected on 321. The control course was knowledge-oriented. The intervention course taught behavior change skills in weekly lectures and peer-led labs. Physical activity was assessed with 7-Day Physical Activity Recall interviews. The intervention had no significant effects on men. Among women, the intervention increased total physical activity during leisure, strengthening exercises, and flexibility exercise. This university course had the intended effects of promoting healthful patterns of physical activity among women, but no effects were observed on men, who were more active than women at baseline. 相似文献
998.
Cynthia A. Olney Joyce E. B. Backus Lori J. Klein 《Journal of the Medical Library Association》2010,98(1):65-72
Objectives:
Through interviews with the National Library of Medicine''s MedlinePlus Go Local collaborators, an evaluation team sought to identify process characteristics that are critical for long-term sustainability of Go Local projects and to describe the impact that Go Local projects have on sponsoring institutions.Methods:
Go Local project coordinators (n = 44) at 31 sponsor institutions participated in semi-structured interviews about their experiences developing and maintaining Go Local sites. Interviews were summarized, checked for accuracy by the participating librarians, and analyzed using a general inductive methodology.Results:
Institutional factors that support Go Local projects were identified through the interviews, as well as strategies for staffing and partnerships with external organizations. Positive outcomes for sponsoring institutions also were identified.Conclusions:
The findings may influence the National Library of Medicine team''s decisions about improvements to its Go Local system and the support it provides to sponsoring institutions. The findings may benefit current sponsoring institutions as well as those considering or planning a Go Local project.Highlights
- Many project coordinators said they underestimated the level of work their National Library of Medicine (NLM) MedlinePlus Go Local projects would require, but most expressed dedication to the project and optimism about project sustainability.
- An institutional record of community service or outreach and a director who was supportive of the project were important factors in the progress and sustainability of Go Local projects.
- Go Local projects brought recognition to some sponsoring institutions from their parent institutions or their communities and provided opportunities to establish better relations with other libraries and institutions.
- Go Local projects ran more smoothly when a person, even a temporary hire, with dedicated time for the project was in charge during the initial building phase. Volunteer assistance has been difficult to motivate and sustain.
Implications
- NLM''s Go Local proposal guidelines accurately identify the factors that institutions should pay close attention to when planning a Go Local project.
- NLM should emphasize continuity plans to address project coordinator turnover.
- NLM should develop a more formal orientation plan for new project coordinators to assist program continuity at the sponsoring institutions.
999.
S Crawford B Halbrook E Kelly L Stucki 《Bulletin of the Medical Library Association》1987,75(3):202-208
The online public access catalog consists essentially of a machine-readable database with network capabilities. Like other computer-based information systems, it may be continuously enhanced by the addition of new capabilities and databases. It may also become a gateway to other information networks. This paper reports the evolution of the Bibliographic Access and Control System (BACS) of Washington University in end-user searching, current awareness services, information management, and administrative functions. Ongoing research and development and the future of the online catalog are also discussed. 相似文献
1000.
Despite the myriad of soft lithography based micropatterning methods available to researchers, it is still challenging to define small features (10–100 μm) that are spaced far apart (1–10 mm). In this report, we describe a combined microfluidic-microstencil patterning method that can produce multifunctional substrates of small features, O(10 μm), with a large pitch, O(1 mm). In that, we fabricate microstencils using an UV curable polyurethane (Norland Optical Adhesive 81) with dense arrays of 10–100 μm holes. Overlaying arrays of microfluidic channels over these microstencils allow for the control of the spacing between features and the ability to pattern multiple substrates. We show that this method is capable of patterning soluble proteins, fibrillar insoluble collagen, liposomes, cells, and nanoparticles. We demonstrate the utility of the method by measuring platelet adhesion under flow to three adhesive proteins (insoluble fibrillar collagen, laminin, and reconstituted acid solubilized collagen fibers) in a single assay. 相似文献