全文获取类型
收费全文 | 440篇 |
免费 | 3篇 |
专业分类
教育 | 271篇 |
科学研究 | 47篇 |
各国文化 | 6篇 |
体育 | 72篇 |
文化理论 | 14篇 |
信息传播 | 33篇 |
出版年
2023年 | 2篇 |
2022年 | 13篇 |
2021年 | 17篇 |
2020年 | 18篇 |
2019年 | 25篇 |
2018年 | 30篇 |
2017年 | 20篇 |
2016年 | 26篇 |
2015年 | 16篇 |
2014年 | 20篇 |
2013年 | 94篇 |
2012年 | 20篇 |
2011年 | 20篇 |
2010年 | 14篇 |
2009年 | 12篇 |
2008年 | 10篇 |
2007年 | 13篇 |
2006年 | 11篇 |
2005年 | 9篇 |
2004年 | 2篇 |
2003年 | 10篇 |
2002年 | 3篇 |
2001年 | 1篇 |
2000年 | 6篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1996年 | 3篇 |
1995年 | 5篇 |
1994年 | 2篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有443条查询结果,搜索用时 437 毫秒
411.
412.
This paper establishes a structural typology of the organisational configurations of public research organisations which vary in their relative internal sharing of authority between researchers and managers; we distinguish between autonomous, heteronomous and managed research organisations. We assume that there are at least two sources of legitimate authority within research organisations, one derived from formal hierarchy (organisational leadership) and another derived from the research community (professional); the balance of authority between researchers and managers is essentially structural but is empirically mediated by the funding portfolio of organisations and the corresponding endowment of resources at the disposal of leaders or researchers. Changes in the level, sources and strings of organisational and individual research funding are expected to affect the balance of internal authority in different ways depending on the organisational configuration, and to open the door to the influence of external actors in the development of research agendas. 相似文献
413.
414.
国际教育局(BIE)等机构正在进行的“公民资格教育”研究,被称为现在“最有价值的国际比较教育研究之一。为此,国际教育局的《教育的信息与革新》季刊1995年3月出版了专刊。我们译出其中的两篇,并用现在的篇名予以涵盖。第一篇对三个主要研究模型作了概括,第二篇则对主要研究结论作了总结,实际上,涉及的问题似已超出了学生政治社会化的范围。 相似文献
415.
416.
A visual display of the most important universities in the world is the aim of this paper. It shows the topological characteristics and describes the web relationships among universities of different countries and continents. The first 1000 higher education institutions from the Ranking Web of World Universities were selected and their link relationships were obtained from Yahoo! Search. Network graphs and geographical maps were built from the search engine data. Social network analysis techniques were used to analyse and describe the structural properties of the whole of the network and its nodes. The results show that the world-class university network is constituted from national sub-networks that merge in a central core where the principal universities of each country pull their networks toward international link relationships. The United States dominates the world network, and within Europe the British and the German sub-networks stand out. 相似文献
417.
Juan J. Ley-Rosas Luis E. González-Jiménez Alexander G. Loukianov Jorge E. Ruiz-Duarte 《Journal of The Franklin Institute》2019,356(5):2559-2581
In this work, considering the roll dynamics and actuator dynamics, an observer-based control scheme for a vehicle is proposed. The proposal considers a nonlinear higher order sliding mode observer to estimate unmeasurable lateral velocity, roll angle and roll velocity. Using the observer information, a controller based on block control with sliding mode technique is designed for the reference trajectory tracking of the lateral and yaw velocities of the vehicle. The stability of the complete closed-loop system including zero dynamics is analyzed. The effectiveness of the proposed scheme is demonstrated through CarSim simulations. 相似文献
418.
419.
Luis Diestre 《Research Policy》2018,47(10):1904-1917
This study examines how R&D alliance governance affects both the probability and magnitude of negative spillovers triggered by a partner’s safety crisis. I show that hierarchical governance leads to a lower probability that a partner will suffer a crisis and thus trigger a negative spillover, yet this governance mode leads to negative spillovers of greater magnitude should they happen. Because expected spillover costs are calculated as the probability of occurrence times the magnitude of such costs, it is not clear which governance mode best minimizes expected spillover costs. I combine transaction costs economics and signaling theory to develop a contingency model that identifies which effect is more likely to dominate, as a way to address the reported dilemma. I found evidence in support of the described dilemma and the contingency model in a sample of 296 R&D outsourcing alliances in the biopharmaceutical industry. 相似文献
420.