全文获取类型
收费全文 | 22882篇 |
免费 | 247篇 |
国内免费 | 30篇 |
专业分类
教育 | 15709篇 |
科学研究 | 2738篇 |
各国文化 | 240篇 |
体育 | 1763篇 |
综合类 | 10篇 |
文化理论 | 187篇 |
信息传播 | 2512篇 |
出版年
2021年 | 186篇 |
2020年 | 289篇 |
2019年 | 403篇 |
2018年 | 519篇 |
2017年 | 537篇 |
2016年 | 525篇 |
2015年 | 346篇 |
2014年 | 486篇 |
2013年 | 4208篇 |
2012年 | 449篇 |
2011年 | 465篇 |
2010年 | 406篇 |
2009年 | 362篇 |
2008年 | 441篇 |
2007年 | 403篇 |
2006年 | 394篇 |
2005年 | 344篇 |
2004年 | 343篇 |
2003年 | 314篇 |
2002年 | 280篇 |
2001年 | 560篇 |
2000年 | 419篇 |
1999年 | 361篇 |
1998年 | 198篇 |
1997年 | 229篇 |
1996年 | 221篇 |
1995年 | 196篇 |
1994年 | 239篇 |
1993年 | 213篇 |
1992年 | 309篇 |
1991年 | 326篇 |
1990年 | 332篇 |
1989年 | 339篇 |
1988年 | 283篇 |
1987年 | 282篇 |
1986年 | 303篇 |
1985年 | 352篇 |
1984年 | 303篇 |
1983年 | 293篇 |
1982年 | 244篇 |
1981年 | 241篇 |
1980年 | 212篇 |
1979年 | 300篇 |
1978年 | 271篇 |
1977年 | 219篇 |
1976年 | 188篇 |
1975年 | 204篇 |
1974年 | 180篇 |
1973年 | 195篇 |
1971年 | 171篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
951.
Craig W. Trumbo 《Mass Communication and Society》2013,16(5):718-738
The effect that newspapers had on patients visiting physicians for influenza was examined for 2002 to 2008. The basis for this investigation rests on theories of media effects drawn from agenda setting, media hype, and the Social Amplification of Risk Framework. It was hypothesized that controlling for the rate of influenza, a positive relationship exists in which increases and decreases of newspaper attention to influenza precede increases and decreases in the percentage of patients visiting physicians for flu symptoms. The percentage of visits and the percentage of positive flu tests are taken from the Centers for Disease Control's flu report. Media attention was located through the Lexis/Nexis database as words per week in stories having flu in the headline in 32 newspapers. Time series analysis shows that controlling for autoregressive and seasonal effects, and the actual rate of disease present, news attention in the previous week accounts for a statistically significant portion of the increase and decrease in the number of individuals who go to their physician reporting influenza-like symptoms. Reverse causality was examined. It was shown that controlling for autoregressive and seasonal effects, patient visits did not predict news coverage, whereas the rate of the flu in the previous 3 weeks did. 相似文献
952.
Schley S Walter GG Weathers RR Hemmeter J Hennessey JC Burkhauser RV 《Journal of deaf studies and deaf education》2011,16(4):524-536
This article examines the effect that postsecondary education has on earnings and the duration of time spent in the Social Security disability programs for young persons who are deaf or hard of hearing. Our hypothesis is that investments in postsecondary training increase the likelihood of employment for persons who are deaf or hard of hearing and thus reduce dependency on disability-related income support programs. A longitudinal data set based upon records from the National Technical Institute for the Deaf and Social Security administrative records is used for this analysis. We find that those who graduate, even those who graduate with vocational degrees, experience significant earnings benefits and reductions in the duration of time spent on federal disability programs when compared with those who do not graduate with a degree. This finding suggests that reductions in the duration of time spent on Social Security programs are not limited to those with the highest level of scholastic aptitude and that investments in post-secondary education can benefit a broad group of deaf and hard-of-hearing persons. In addition, the data show that individuals who attend college, but withdraw before graduation, fair no better economically than individuals who never attended college. 相似文献
953.
Previous research notes the importance of understanding racial/ethnic differential prediction of college grades across multiple institutions. Institutional variation in selection indices is especially important given some states' laws governing public institutions' admissions decisions. This paper employed multilevel moderated multiple regression to study the variation of selection indices across 30 institutions and the accuracy of selection indices in predicting college grades for students of different racial/ethnic backgrounds. Several benefits of multilevel models for cross-institutional differential prediction studies were described and include: controlling for institutional differences in range restriction, providing reliability estimates of least squares estimates, and adjusting criterion scores for differences in coursework difficulty. The findings from this study provide evidence of institutional variation in selection indices, which challenges current laws aimed at standardizing them. Specifically, there was evidence that the predictor slope coefficients varied across institutions, in addition to the estimates that measured intercept differences for African and Asian American students. Across universities, the results mirrored previous findings: high school grade point average (GPA) differentially predicted grades for African Americans, SAT verbal scores differentially predict grades for Asian Americans, and SAT math scores were better predictors of Asian Americans' grades. 相似文献
954.
Amy M. Magnus Jenny S. West Daniel W. Scott Cheryl Maxson Jody Miller 《Journal of Criminal Justice Education》2019,30(2):223-249
This paper describes our efforts to systematically generate knowledge from ethnographic and other qualitative scholarship as a way of bridging intellectual gaps found in quantitative research. We ground this scholarly endeavor in the study of gangs, which has a lengthy history in the field of criminology, yet lacks a coherent, coordinated, and comparative understanding of gang dynamics, behavior, and impacts. We discuss the importance of acknowledging the multiple and mixed methodologies used in gang scholarship and detail the inductive, deductive, and iterative process that helped us (1) develop a comprehensive coding instrument for coding a range of qualitative works, (2) establish the instrument’s inter-rater reliability, and (3) remain cognizant and reflexive about the strengths of both quantitative and qualitative research. Finally, we share the critical yet informative challenges we faced throughout the project and conclude with reflections on why the project was unsuccessful in the way we originally envisioned. 相似文献
955.
Who educates teacher educators? How are teacher educators educated and prepared for their roles and tasks? This article uses a review of a two-year full-time Diploma in Teacher Education (DTE) for teacher educators in Uganda to engage with these questions. The article begins with a presentation of the Ugandan teacher education context and a literature review, focusing mainly on teacher educator knowledge, preparation, roles and tasks. It then presents the review process and discusses the main findings that emerged, exploring their implications for the education of teacher educators in Uganda and internationally. The main implications concern the critical role of teacher education pedagogy, context, teacher educator knowledge, tasks and roles, reflective practice, practitioner research, and the background, capacities and education of the educator of teacher educators. 相似文献
956.
Meera Menon Rebecca C. Fauth M. Ann Easterbrooks 《Parenting, science and practice》2020,20(3):200-228
SYNOPSIS
Objective . Most parents manage some degree of parenting stress without serious concerns, but young mothers experience parenting stress at higher levels than adult mothers; high parenting stress is problematic due to its association with children’s socioemotional and behavior problems and the increased likelihood of maltreatment. Understanding the circumstances that precipitate or mitigate parents’ stress can have lasting impacts for child well-being. Extant research fails to account for both longitudinal and individual variation in young mothers’ parenting stress, leading to equivocal findings about the nature of mothers’ parenting stress trajectories across early childhood. Design . The present study used growth mixture modeling (GMM) to model the trajectories of 544 first-time young mothers’ parenting stress from children’s infancy to school-age. We considered how protective factors (i.e., social support) and psychological vulnerabilities (i.e., depression) experienced during the transition to parenthood were associated with parenting stress trajectories and variation within trajectories when children were of school-age. Results . GMM identified three trajectories of parenting stress: “low stable”, “high increasing”, and “high decreasing.” Protective factors were related to low and decreasing patterns of parenting stress, whereas psychological vulnerabilities were associated with higher parenting stress patterns. Conclusions . This study has implications for programs and services that help young mothers cope with the demands of parenting and reduce parenting stress. 相似文献
957.
J. Bruce Francis Michalina Vaughan Colin Flood Page Sally Tomlinson R. A. Becher Margaret C. Ives John Urry K. G. Collier Meir Zadok Charles Carter Jürgen Schramm Jean Barry Graeme C. Moodie Donald Bligh R. A. King D. G. Mulcahy Peter Scott F. R. Charmer T. R. Bone John A. Hughes Roger Greenhough Alec M. Ross John Wakeford Joyce Skinner Duncan B. Nimmo Cedric Cullingford L. R. B. Elton 《Higher Education》1979,8(6):709-744
958.
James C. McCroskey Virginia P. Richmond 《Journal of Applied Communication Research》2013,41(3):278-289
Reciprocity and accommodation theories were applied to communication between supervisors and subordinates. It was reasoned that supervisors and subordinates informally (and not necessarily consciously) negotiate communication styles with each other which become significantly correlated over time. It was hypothesized that the supervisors’ Socio‐Communicative Style and the subordinates’ Socio‐Communicative Orientation would be positively correlated with each other and both would predict the subordinates’ perceptions of the supervisors’ credibility, attractiveness, and the subordinates’ general attitude toward the supervisor and communicating with that supervisor. The results were consistent with the hypotheses. 相似文献
959.
Debi de Prasad C. R. Maity de Swapan 《Indian journal of clinical biochemistry : IJCB》1993,8(1):71-72
Urinary excretion of 3 methoxy-4-hydroxy phenyl glycol (MHPG) and 3-methoxy-4-hydroxy mandelic acid (VMA) were estimated in 18 Post-Japanese Encephalitis depressive patients and 20 unipolar depressive patients to determine their biochemical differences. Both the metabolites were low in the former group in comparison to the later group, indicating that the metabolic events in respect to catecholamine turn over are different in two disorders. 相似文献
960.
In order to identify factors associated with on-field moral functioning among student athletes within the unique context of football, we examined masculine gender role conflict, moral atmosphere, and athletic identity. Using structural equation modeling to assess survey data from 204 high school football players, results demonstrated that moral atmosphere (i.e., the influence of coaches and teammates) was significantly associated with participants' process of on-field moral functioning across the levels of judgment, intention, and behavior. Neither masculine gender role conflict nor athletic identity significantly predicted moral functioning, but the results indicated that participants' identification with the athlete role significantly predicted conflict with socialized gender roles. Results suggest that in the aggressive and violent sport of football, coaches can have a direct influence on players' moral functioning process. Coaches can also have an indirect effect by influencing all the players so that a culture of ethical play can be cultivated among teammates and spread from the top down. 相似文献