全文获取类型
收费全文 | 4215篇 |
免费 | 111篇 |
国内免费 | 7篇 |
专业分类
教育 | 3261篇 |
科学研究 | 239篇 |
各国文化 | 91篇 |
体育 | 346篇 |
综合类 | 1篇 |
文化理论 | 52篇 |
信息传播 | 343篇 |
出版年
2023年 | 22篇 |
2022年 | 37篇 |
2021年 | 53篇 |
2020年 | 104篇 |
2019年 | 157篇 |
2018年 | 225篇 |
2017年 | 218篇 |
2016年 | 195篇 |
2015年 | 115篇 |
2014年 | 171篇 |
2013年 | 876篇 |
2012年 | 160篇 |
2011年 | 145篇 |
2010年 | 130篇 |
2009年 | 131篇 |
2008年 | 134篇 |
2007年 | 110篇 |
2006年 | 117篇 |
2005年 | 102篇 |
2004年 | 77篇 |
2003年 | 97篇 |
2002年 | 89篇 |
2001年 | 66篇 |
2000年 | 47篇 |
1999年 | 54篇 |
1998年 | 38篇 |
1997年 | 47篇 |
1996年 | 44篇 |
1995年 | 44篇 |
1994年 | 25篇 |
1993年 | 25篇 |
1992年 | 28篇 |
1991年 | 43篇 |
1990年 | 27篇 |
1989年 | 34篇 |
1988年 | 22篇 |
1987年 | 18篇 |
1986年 | 30篇 |
1985年 | 22篇 |
1984年 | 18篇 |
1983年 | 20篇 |
1982年 | 26篇 |
1981年 | 25篇 |
1980年 | 11篇 |
1979年 | 29篇 |
1978年 | 12篇 |
1977年 | 17篇 |
1976年 | 13篇 |
1974年 | 9篇 |
1967年 | 6篇 |
排序方式: 共有4333条查询结果,搜索用时 15 毫秒
251.
252.
School quality, child wellbeing and parents’ satisfaction 总被引:1,自引:0,他引:1
Child wellbeing at school and enjoyment of the learning environment are important economic outcomes, in particular because a growing body of research shows they are strongly linked to later educational attainments and labour market success. However, the standard working assumption in the economics of education is that parents choose schools on the basis of test-score performance, and concerns about child happiness are largely ignored. In this paper, we address this omission and investigate to what extent parents’ and children's views of their school are linked to test-score based performance, and to what extent parents’ judgements of school quality are linked to their child's happiness. To do so, we use information on stated attitudes from the Longitudinal Survey of Young People in England (LSYPE) matched to administrative records on pupil achievements in England. Our results suggest that test-score based measures of school quality tend to dominate parental satisfaction with the learning environment. However, school quality along this dimension is not strongly associated with pupil happiness and wellbeing at school. 相似文献
253.
Dirk T. Tempelaar Sybrand Schim van der Loeff Wim H. Gijselaers Jan F. H. Nijhuis 《Research in higher education》2011,52(4):395-419
Student achievement motivations are crucial in learning in two ways: as a determinant and an aim of learning. In this study,
we focus on two related questions with regard to achievement motivations: to what extent are they subject-specific, and to
what extent are they malleable? Answers to both questions are especially important when aiming to influence motivations. Malleability
of motivation is studied by designing structural equation models that explain achievement motivation out of the most stable
student characteristics one can think of: gender, and personality traits. Subject matter variability is studied by estimating
these models for five main subject areas in a business program. The motivation construct we use is based on the expectancy-value
model and distinguishes four different facets: cognitive competence, difficulty, task-value and affect. We find evidence for
strong subject-specificity and considerable non-malleability of achievement motivation; part of that last aspect is a remarkably
constant over-confidence gender gap present in the data of the calibration of competency beliefs and performance in all subject
areas. 相似文献
254.
255.
256.
Bart Van Looy Paolo LandoniJulie Callaert Bruno van PottelsbergheEleftherios Sapsalis Koenraad Debackere 《Research Policy》2011,40(4):553-564
The phenomenon of entrepreneurial universities has received considerable attention over the last decades. An entrepreneurial orientation by academia might put regions and nations in an advantageous position in emerging knowledge-intensive fields of economic activity. At the same time, such entrepreneurial orientation requires reconciliation with the scientific missions of academia. Large-scale empirical research on antecedents of the entrepreneurial effectiveness of universities is scarce. This contribution examines the extent to which scientific productivity affect entrepreneurial effectiveness, taking into account the size of universities and the presence of disciplines, as well as the R&D intensity of the regional business environment (BERD). In addition, we assess the occurrence of trade-offs between different transfer mechanisms (contract research, patenting and spin off activity). The data used pertain to 105 European universities. Our findings reveal that scientific productivity is positively associated with entrepreneurial effectiveness. Trade-offs between transfer mechanisms do not reveal themselves; on the contrary, contract research and spin off activities tend to facilitate each other. Limitations and implications for future research are discussed. 相似文献
257.
Regional investment in R&D, technological development and innovation is perceived as being strongly associated with productivity, growth and sustained international competitiveness. One policy instrument by which policy makers have attempted to create regional advantage has been the establishment of publicly funded research centres (PRCs). In this paper we develop a logic model for this type of regional intervention and examine the outputs and longer-term outcomes from a group of (18) publicly funded R&D centres. Our results suggest some positive regional impacts but also identify significant differences in terms of innovation, additionality and sustainability between university-based and company-based PRCs. University-based PRCs have higher levels of short-term additionality, demonstrate higher levels of organisational innovation but prove less sustainable. Company-based PRCs demonstrate more partial additionality in the short-term but ultimately prove more sustainable. 相似文献
258.
Stephen B. Adams 《Research Policy》2011,40(3):368-379
What are the respective roles of indigenous and exogenous factors in the development of high-tech regions? Entrepreneurs and their start-ups have dominated Silicon Valley's economy in recent decades, but a different dynamic was at work from 1940 to 1965, when the Valley emerged as a formidable high-tech region. In key industries (electronics, semiconductors, computers, and aerospace) that defined Silicon Valley as a high-tech cluster during that period, companies based elsewhere played critical roles in planting the organizations that would - through the innovations they made, the technical talent they attracted, and the start-ups they spun off - help make the Valley the world's most admired and emulated high-tech region. 相似文献
259.
Lidwien van de WijngaertAuthor Vitae Willem PietersonAuthor Vitae Marije L. TeerlingAuthor Vitae 《International Journal of Information Management》2011,31(5):415-419
Information technology allows national and local governments to satisfy the needs of citizens in a cost effective way. Unfortunately, citizens still tend to prefer traditional, more costly channels, such as the front desk, phone and mail. Through pilot projects government agencies attempt to influence this behavior of citizens, directing them towards the online channel. With this paper we provide insight into the possibility to influence citizens’ behavior in the complex landscape of multi-channel service provision. The paper systematically compares five pilot projects using a framework that is based on organizational and marketing literature. The results show that socio-psychological factors are crucial in multi-channel management, much more than the technology itself. We conclude that citizens can be directed towards the online channel. However, not all projects are successful. Economic and legal instruments tend to sort more direct effects than communication or service instruments. Moreover, organizational factors such as bureaucracy often hinder eventual success. Choosing a smart and relatively small scope and strong project manager may help to evoke success in directing citizen online behavior. 相似文献
260.
Felicitas Kraemer Kees van Overveld Martin Peterson 《Ethics and Information Technology》2011,13(3):251-260
We argue that some algorithms are value-laden, and that two or more persons who accept different value-judgments may have
a rational reason to design such algorithms differently. We exemplify our claim by discussing a set of algorithms used in
medical image analysis: In these algorithms it is often necessary to set certain thresholds for whether e.g. a cell should
count as diseased or not, and the chosen threshold will partly depend on the software designer’s preference between avoiding
false positives and false negatives. This preference ultimately depends on a number of value-judgments. In the last section
of the paper we discuss some general principles for dealing with ethical issues in algorithm-design. 相似文献