全文获取类型
收费全文 | 267篇 |
免费 | 2篇 |
国内免费 | 3篇 |
专业分类
教育 | 175篇 |
科学研究 | 41篇 |
各国文化 | 4篇 |
体育 | 11篇 |
文化理论 | 4篇 |
信息传播 | 37篇 |
出版年
2023年 | 6篇 |
2022年 | 3篇 |
2021年 | 11篇 |
2020年 | 12篇 |
2019年 | 8篇 |
2018年 | 29篇 |
2017年 | 17篇 |
2016年 | 11篇 |
2015年 | 3篇 |
2014年 | 8篇 |
2013年 | 45篇 |
2012年 | 17篇 |
2011年 | 11篇 |
2010年 | 4篇 |
2009年 | 4篇 |
2008年 | 6篇 |
2007年 | 4篇 |
2006年 | 6篇 |
2004年 | 4篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1997年 | 5篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1981年 | 1篇 |
1980年 | 3篇 |
1978年 | 3篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1970年 | 3篇 |
1965年 | 1篇 |
1963年 | 1篇 |
1961年 | 2篇 |
1959年 | 1篇 |
1930年 | 2篇 |
1929年 | 1篇 |
排序方式: 共有272条查询结果,搜索用时 15 毫秒
81.
Vladimir Aleksandrovich Galanov 《Higher Education in Europe》1997,22(2):137-143
For a number of reasons, higher education in the Russian Federation has been able to benefit from a more stable financial situation than have most of the other “socio‐cultural areas” in Russia. It has nevertheless been severely affected by the problems besetting the other sectors of the Russian economy, most of them linked to the rigours of transition to a market economy. The situation will improve as the Russian economy as a whole improves and as higher education in Russia not only becomes more market‐oriented and quality conscious but adopts specific administrative measures designed to ensure efficiency. 相似文献
82.
83.
84.
This paper focuses on four fusion algorithms for the estimation of nonlinear cost function (NCF) in a multisensory environment. In multisensory filtering and control problems, NCF represents a nonlinear multivariate functional of state variables, which can indicate useful information of the target systems for automatic control. To estimate the NCF using multisensory information, we propose one centralized and three decentralized estimation fusion algorithms. For multivariate polynomial NCFs, we propose a simple closed-form computation procedure. For general NCFs, the most popular procedure for the evaluation of their estimates is based on the unscented transformation. The effectiveness and estimation accuracy of the proposed fusion algorithms are demonstrated with theoretical and numerical examples. 相似文献
85.
Leble V Lima R Dias R Fernandes C Ishikawa T Imai Y Yamaguchi T 《Biomicrofluidics》2011,5(4):44120-4412015
In microcirculation, red blood cells (RBCs) flowing through bifurcations may deform considerably due to combination of different phenomena that happen at the micro-scale level, such as: attraction effect, high shear, and extensional stress, all of which may influence the rheological properties and flow behavior of blood. Thus, it is important to investigate in detail the behavior of blood flow occurring at both bifurcations and confluences. In the present paper, by using a micro-PTV system, we investigated the variations of velocity profiles of two working fluids flowing through diverging and converging bifurcations, human red blood cells suspended in dextran 40 with about 14% of hematocrit level (14 Hct) and pure water seeded with fluorescent trace particles. All the measurements were performed in the center plane of rectangular microchannels using a constant flow rate of about 3.0 × 10−12 m3/s. Moreover, the experimental data was compared with numerical results obtained for Newtonian incompressible fluid. The behavior of RBCs was asymmetric at the divergent and convergent side of the geometry, whereas the velocities of tracer particles suspended in pure water were symmetric and well described by numerical simulation. The formation of a red cell-depleted zone immediately downstream of the apex of the converging bifurcation was observed and its effect on velocity profiles of RBCs flow has been investigated. Conversely, a cell-depleted region was not formed around the apex of the diverging bifurcation and as a result the adhesion of RBCs to the wall surface was enhanced in this region. 相似文献
86.
Ivan Ivić 《Higher Education in Europe》1991,16(2):10-22
This article takes a close analytical look at the internationalization of higher education, asking penetrating questions with regard to its basis, its forms, and its results. The author is particularly concerned with problems of asymmetry with regard to the educational links, particularly at higher education level, between the developed western democracies and the developing countries. Going beyond the question of brain drain, the article probes the problem of the alienation of third world academics trained in the higher education institutions of developed countries. While on the balance the author praises the results of the internationalization of higher education and, at any rate, recognizes that it is here to stay, he cautions all those involved in it be aware of who in fact gains and who loses as a result of it. 相似文献
87.
88.
89.
Ph.D. Senior researcher at the Scientific Research Centre of the Institute of Youth (Moscow). Specialist in studies of youth
policies and civil society. Author ofInternational experience of public support of the youth organizations (1995) andSituation and prospects of social voluntary action in Russia (1995). 相似文献
90.
Three hundred and ninety-one children (195 girls; Mage = 9.56 years) attending Grades 1 and 5 completed implicit and explicit measures of math attitudes and math self-concepts. Math grades were obtained. Multilevel analyses showed that first-grade girls held a strong negative implicit attitude about math, despite no gender differences in math grades or self-reported (explicit) positivity about math. The explicit measures significantly predicted math grades, and implicit attitudes accounted for additional variance in boys. The contrast between the implicit (negativity for girls) and explicit (positivity for girls and boys) effects suggest implicit–explicit dissociations in children, which have also been observed in adults. Early-emerging implicit attitudes may be a foundation for the later development of explicit attitudes and beliefs about math. 相似文献