全文获取类型
收费全文 | 3723篇 |
免费 | 31篇 |
专业分类
教育 | 2597篇 |
科学研究 | 315篇 |
各国文化 | 56篇 |
体育 | 339篇 |
综合类 | 2篇 |
文化理论 | 50篇 |
信息传播 | 395篇 |
出版年
2022年 | 19篇 |
2021年 | 37篇 |
2020年 | 69篇 |
2019年 | 106篇 |
2018年 | 120篇 |
2017年 | 111篇 |
2016年 | 94篇 |
2015年 | 63篇 |
2014年 | 111篇 |
2013年 | 846篇 |
2012年 | 85篇 |
2011年 | 94篇 |
2010年 | 76篇 |
2009年 | 76篇 |
2008年 | 79篇 |
2007年 | 74篇 |
2006年 | 91篇 |
2005年 | 80篇 |
2004年 | 72篇 |
2003年 | 71篇 |
2002年 | 54篇 |
2001年 | 48篇 |
2000年 | 56篇 |
1999年 | 51篇 |
1998年 | 55篇 |
1997年 | 46篇 |
1996年 | 40篇 |
1995年 | 35篇 |
1994年 | 34篇 |
1993年 | 39篇 |
1992年 | 32篇 |
1991年 | 38篇 |
1990年 | 42篇 |
1989年 | 42篇 |
1988年 | 45篇 |
1987年 | 43篇 |
1986年 | 35篇 |
1985年 | 32篇 |
1984年 | 36篇 |
1983年 | 43篇 |
1982年 | 30篇 |
1981年 | 21篇 |
1980年 | 26篇 |
1979年 | 42篇 |
1978年 | 37篇 |
1977年 | 29篇 |
1976年 | 31篇 |
1974年 | 24篇 |
1973年 | 26篇 |
1969年 | 19篇 |
排序方式: 共有3754条查询结果,搜索用时 15 毫秒
51.
Thomas H. Turney 《Learning & behavior》1976,4(4):363-366
Long-Evans rats were trained on an easy simultaneous discrimination problem and then transferred to a hard discrimination problem. The discriminanda were different orientations of stripes. In Experiment I, transfer was intradimensional with stimulus generalization controlled. The easy-to-hard effect was not found. In Experiment II transfer was intradimensional and either compatible (nonreversal) or incompatible (reversal). With compatible transfer, rats trained on a prior easy problem learned the hard problem faster than rats trained only on the hard problem. Persistent negative transfer was found with incompatible transfer. Attention was not supported as underlying the easy-to-hard effect. Explanations based on specific sources of intradimensional transfer, such as stimulus generalization or adaptation level, are suggested. 相似文献
52.
Thomas M. Skovholt Tabitha L. Grier Matthew R. Hanson 《Journal of Career Development》2001,27(3):167-176
Balancing self-care and other-care is often a struggle for career counselors and others in the helping professions. The process of caring is made up of a constant series of empathic attachments, active involvements, and felt separations. The ability to continually engage in the caring cycle is important for success. However, the constant need to re-create the cycle of caring can lead to counselor depletion and burnout. This article provides a developmental framework for assisting career counselors to avoid depleted caring while prolonging their professional longevity. The model of self-care includes recognizing the hazards of high touch work, such as limited resources and constant one-way caring. Also addressed are specific means of professional and personal sustenance, such as maximizing experiences of professional success and balancing personal wellness throughout one's career. 相似文献
53.
54.
Thomas B. Åstebro 《Research Policy》2005,34(9):1404-1418
Research on technological opportunity has typically focused on the impact of broad industry characteristics on R&D intensity of firms. This study complements such approaches by examining the impact of a multidimensional vector that measures technological opportunity on independent inventors’ decisions to patent and commercialize inventions. Using data from 559 inventions and controlling for demand, appropriability, and competitive conditions, we found two of four tested dimensions of technological opportunity - technical performance and technical uncertainty - to be significant and important determinants of the likelihood of commercialization. Technical feasibility appears important in affecting patenting but unimportant in affecting commercialization. Technical significance carries a negative, although insignificant, sign conditioning commercialization. 相似文献
55.
Thomas E. Gaston Francesca Ounsworth Tessa Senders Sarah Ritchie Emma Jones 《Learned Publishing》2020,33(2):154-162
Previous research has found that researchers rank journal reputation and impact factor (IF) amongst the key selection criteria when choosing where to submit. We explored the actual effect upon submission numbers of several possible factors. We retrieved 10 years of submission data from over a thousand journals, as well as data on IF, retractions, and other factors. We performed statistical analysis and identified correlations. We also undertook case study research on the 55 most significant submission decreases. We found a statistically significant correlation between changes in IF, ISI percentage ranking, and changes in submissions numbers in subsequent years. We also found a statistically significant effect on submission numbers in the year following the publication of a retraction. Our case studies identified other factors, including negative feedback on the peer review process. Our findings regarding IF confirm previous indications about the significance of IF on submissions. We explain the correlation with retractions through the concept of ‘peer review reputation’. These results indicate that editors and publishers need to focus on a journal's peer review practices, as well as a journal's IF, if they are to maintain and grow submissions. 相似文献
56.
57.
58.
Minerva - This paper aims to explore disciplinary variation in valuation practices by comparing the way research groups accumulate credibility across four epistemic cultures. Our analysis is based... 相似文献
59.
Harry F. Dorrell Joseph M. Moore Mark F. Smith Thomas I. Gee 《Journal of sports sciences》2019,37(1):67-73
This study investigated the validity and reliability of the GymAware PowerTool (GPT). Thirteen resistance trained participants completed three visits, consisting of three repetitions of free-weight back squat, bench press, deadlift (80% one repetition maximum), and countermovement jump. Bar displacement, peak and mean velocity, peak and mean force, and jump height were calculated using the GPT, a three-dimensional motion capture system (Motion Analysis Corporation; 150 Hz), and a force plate (Kistler; 1500 Hz). Least products regression were used to compare agreeability between devices. A within-trial one-way ANOVA, typical error (TE; %), and smallest worthwhile change (SWC) were used to assess reliability. Regression analysis resulted in R2 values of >0.85 for all variables excluding deadlift mean velocity (R2 = 0.54–0.69). Significant differences were observed between visits 3-2 for bench press bar displacement (0.395 ± 0.055 m; 0.383 ± 0.053 m), and deadlift bar displacement (0.557 ± 0.034 m; 0.568 ± 0.034 m). No other significant differences were found. Low to moderate TE (0.6–8.8%) were found for all variables, with SWC ranging 1.7–7.4%. The data provides evidence that the GPT can be used to measure kinetic and kinematic outputs, however, care should be taken when monitoring deadlift performance. 相似文献
60.
Ernest A. Collabolletta Allen J. Fossbender Thomas Edward Bratter 《Psychology in the schools》1983,20(4):450-455
Before choosing to become involved with students who currently are abusing psychoactive substances, teachers must consider not only the potential consequences and payoffs to them professionally, but also what specifically they can do to help adolescents. This article presents some of the philosophical problems, and suggests potential solutions of how to relate to students who engage in potentially self-destructive, drug-related behavior. There is a need for teachers to become quasi-counselors and consultants, since they are the first line of defense against substance use and abuse. 相似文献