全文获取类型
收费全文 | 124384篇 |
免费 | 1877篇 |
国内免费 | 235篇 |
专业分类
教育 | 86746篇 |
科学研究 | 13484篇 |
各国文化 | 2014篇 |
体育 | 9548篇 |
综合类 | 172篇 |
文化理论 | 1085篇 |
信息传播 | 13447篇 |
出版年
2021年 | 961篇 |
2020年 | 1659篇 |
2019年 | 2598篇 |
2018年 | 3110篇 |
2017年 | 3361篇 |
2016年 | 3429篇 |
2015年 | 2353篇 |
2014年 | 3235篇 |
2013年 | 27710篇 |
2012年 | 2421篇 |
2011年 | 2771篇 |
2010年 | 2340篇 |
2009年 | 2648篇 |
2008年 | 2433篇 |
2007年 | 2147篇 |
2006年 | 2381篇 |
2005年 | 2372篇 |
2004年 | 3052篇 |
2003年 | 2365篇 |
2002年 | 2186篇 |
2001年 | 2058篇 |
2000年 | 1745篇 |
1999年 | 1600篇 |
1998年 | 1477篇 |
1997年 | 1526篇 |
1996年 | 1707篇 |
1995年 | 1481篇 |
1994年 | 1485篇 |
1993年 | 1485篇 |
1992年 | 1534篇 |
1991年 | 1447篇 |
1990年 | 1447篇 |
1989年 | 1368篇 |
1988年 | 1235篇 |
1987年 | 1140篇 |
1986年 | 1161篇 |
1985年 | 1426篇 |
1984年 | 1287篇 |
1983年 | 1297篇 |
1982年 | 1270篇 |
1981年 | 1190篇 |
1980年 | 1177篇 |
1979年 | 1259篇 |
1978年 | 1232篇 |
1977年 | 1125篇 |
1976年 | 1013篇 |
1975年 | 815篇 |
1974年 | 818篇 |
1973年 | 789篇 |
1971年 | 631篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
891.
Jordan M. Foley 《Journalism Practice》2020,14(8):933-953
ABSTRACT Press credentialing practices are a vital, yet understudied site of scholarly research on journalistic norms and practices. Press credentialing not only structures internal professional hierarchies, but they also signify the boundaries of the journalistic field itself. This paper explores the legal and theoretical implications of press credentialing to cover the United States Congress, drawing on the concepts of boundary work and journalistic authority to demonstrate the material impact of the space between fields on professional legitimation in journalism. Using WorldNetDaily (WND) as a case study, I argue that the Standing Committee of Correspondents (SCC) occupies a hybrid boundary zone between the journalistic and political fields, generating a unique tension in First Amendment jurisprudence that places journalists in a paradoxical role as both the professional embodiments of free speech and its constitutional steward. The resulting jurisdictional conflict between the SCC and WND extends the relational model of journalistic authority by articulating how journalist-state relations can fundamentally augment the process of legitimation at its fuzzy boundaries. The relevance and implications for press credentialing practices in the digital age are discussed. 相似文献
892.
893.
894.
895.
Emerging fathers experience a variety of stressors, including identity and role transitions, changes in their relationships, and challenges in developing caregiving skills. Increasing expectations for father involvement in childcare are emphasizing the importance of the father role, but social supports for new fathers remain scarce. Nineteen expectant and new fathers participated in a pilot 5-week group intervention aimed at improving stress coping and involvement attitudes using a combination of mindfulness practices and skill-building for parenting and partner communication. We administered surveys pre- and postintervention to assess efficacy in the areas of stress, depressive symptoms, father involvement attitudes, and mindfulness. Within-participant differences were compared across participants as well as examining individual reliable change. Results indicated initial reductions in stress and depressive symptoms and increases in the mindfulness constructs of nonjudgment and nonreactivity. No significant changes were found in father involvement attitudes. Perinatal intervention specific to fathers holds promise as an underexplored avenue for supporting families across the transition to parenthood. 相似文献
896.
897.
898.
Brady D. Lund 《Public Services Quarterly》2020,16(2):112-123
AbstractThis article discusses the use of R programing language for executing a sentiment analysis of tweets pertaining to library topics. This discussion is situated within the literature of marketing and management sciences, which is employing methods of machine learning and business intelligence to make informed decision-making, and library administration, which has expressed great interest in social media engagement within its literature but has yet to adopt these types of analysis. Presented in this article is a sample code with instructions on how users may execute it within R to retrieve and analyze tweets relevant to library services. Two examples created using the code (analysis of top librarians’ tweets and analysis of posts about major book publishers) are used to demonstrate the functionality of the code. The code presented in this article may be used by libraries to analyze tweets about their library and library-related topics, which, in turn, may inform management and marketing design. 相似文献
899.
Michael A. Peters 《Educational Philosophy and Theory》2020,52(8):805-810
900.
Chris Bishop Lucas A. Pereira Valter P. Reis Paul Read Anthony N. Turner Irineu Loturco 《Journal of sports sciences》2020,38(11-12):1296-1303
ABSTRACT The aims of the present study were to provide an in-depth comparison of inter-limb asymmetry and determine how consistently asymmetry favours the same limb during different vertical jump tests. Eighteen elite female under-17 soccer players conducted unilateral squat jumps (SJ), countermovement jumps (CMJ) and drop jumps (DJ) on a portable force platform, with jump height, peak force, concentric impulse and peak power as common metrics across tests. For the magnitude of asymmetry, concentric impulse was significantly greater during the SJ test compared to CMJ (p = 0.019) and DJ (p = 0.003). No other significant differences in magnitude were present. For the direction of asymmetry, Kappa coefficients revealed fair to substantial levels of agreement between the SJ and CMJ (Kappa = 0.35 to 0.61) tests, but only slight to fair levels of agreement between the SJ and DJ (Kappa = ?0.26 to 0.18) and CMJ and DJ (Kappa = ?0.13 to 0.26) tests. These results highlight that the mean asymmetry value may be a poor indicator of true variability of between-limb differences in healthy athletes. The direction of asymmetry may provide a useful monitoring tool for practitioners in healthy athletes, when no obvious between-limb deficit exists. 相似文献