On orthogonal polynomials     

E.I. Jury  S.M. Ahn 《Journal of The Franklin Institute》1975,300(3):169-173

A study is made of the orthogonal polynomials on certain curves in the complex plane. Necessary and sufficient conditions for a set of polynomials to be orthogonal on the curves are obtained in terms of symmetric matrices. The relations of the symmetric matrices to Toeplitz matrices and innerwise matrices are shown.  相似文献   

Preschoolers' quarantining of fantasy stories     

Richert RA  Smith EI 《Child development》2011,82(4):1106-1119

Preschool‐aged children are exposed to fantasy stories with the expectation that they will learn messages in those stories that are applied to real‐world situations. We examined children’s transfer from fantastical and real stories. Over the course of 2 studies, 3½‐ to 5½‐year‐old children were less likely to transfer problem solutions from stories about fantasy characters than stories about real people. A combined analysis of the participants in the 2 studies revealed that the factors predicting transfer differed for the fantasy and real stories. These findings are discussed within the context of their implications for preschoolers’ developing boundaries between fantasy and real worlds.  相似文献   

Videobased lesson analysis: Effective science PD for teacher and student learning     

Kathleen J. Roth  Helen E. Garnier  Catherine Chen  Meike Lemmens  Kathleen Schwille  Nicole I.Z. Wickler 《科学教学研究杂志》2011,48(2):117-148

The Science Teachers Learning from Lesson Analysis (STeLLA) project is a videobased analysis‐of‐practice PD program aimed at improving teacher and student learning at the upper elementary level. The PD program developed and utilized two “lenses,” a Science Content Storyline Lens and a Student Thinking Lens, to help teachers analyze science teaching and learning and to improve teaching practices in this year‐long program. Participants included 48 teachers (n = 32 experimental, n = 16 control) and 1,490 students. The STeLLA program significantly improved teachers' science content knowledge and their ability to analyze science teaching. Notably, the STeLLA teachers further increased their classroom use of science teaching strategies associated with both lenses while their students increased their science content knowledge. Multi‐level HLM analyses linked higher average gains in student learning with teachers' science content knowledge, teachers' pedagogical content knowledge about student thinking, and teaching practices aimed at improving the coherence of the science content storyline. This paper highlights the importance of the science content storyline in the STeLLA program and discusses its potential significance in science teaching and professional development more broadly. © 2011 Wiley Periodicals, Inc., J Res Sci Teach 48: 117–148, 2011  相似文献   

Peer collaboration: the relation of regulatory behaviors to learning with hypermedia     

Fielding I. Winters  Patricia A. Alexander 《Instructional Science》2011,39(4):407-427

Peer collaboration is a pedagogical method currently used to facilitate learning in classrooms. Similarly, computer-learning environments (CLEs) are often used to promote student learning in science classrooms, in particular. However, students often have difficulty utilizing these environments effectively. Does peer collaboration help students learn with these environments? Little research looking closely at face-to-face peer collaboration with computer learning environments exists. Utilizing a social-cognitive theoretical framework, this study investigated the relation between the conceptual-knowledge learning and the collaborative regulatory behaviors of students working with a peer as they studied about the human circulatory system using a hypermedia CLE. Fifty-four high-school students from the East Coast of the United States were audiotaped to identify the collaborative regulatory behaviors they evidenced as they studied. Results revealed significant correlations among students’ proportion of categories of regulatory behaviors and their learning gains (from pretest to posttest). Moreover, qualitative analyses revealed particular behaviors that larger-gain collaborative pairs engaged in to a greater extent than smaller-gain pairs as they learned with the hypermedia environment.  相似文献   

Analysis of the efficiency of applying artificial neuron networks for solving recognition,compression, and prediction problems     

A. A. Talalaev  I. P. Tishenko  V. P. Fralenko  V. M. Khachumov 《Scientific and Technical Information Processing》2011,38(5):313-321

The paper summarizes the experience of developing the PS ANN image recognition software system based on artificial neural networks (ANNs). The real abilities of neural networks to solve image recognition, data compression, and extrapolation problems are demonstrated. The results of experimental studies on accelerating parallel task computations are presented.  相似文献   

E-Government readiness index: A methodology and analysis     

Anteneh Ayanso  Dipanjan Chatterjee  Danny I. ChoAuthor vitae 《Government Information Quarterly》2011,28(4):522-532

E-Government has received significant attention as digital technologies transcend private businesses and serve as a basic source of transformation in government functions. One most notable project is the United Nations Public Administration Network (UNPAN) that assesses the e-Government readiness of the 192 member nations according to a quantitative composite index involving website assessment, telecommunication infrastructure, and human resource endowment. However, the UNPAN index, though rich in depth and breadth of data collection, relies on a method that is a simple mathematical average of the values of the variables measured. This paper revisits the UNPAN index and proposes alternative indices based on principal components analysis (PCA). Using the UNPAN survey data, four different versions of the index are presented and the resulting rankings of the nations are examined vis-à-vis the existing ranking. The theoretical and policy implications of the proposed methodology and its results are discussed.  相似文献   

Enterprise Information Portals in support of business process, design teams and collaborative commerce performance     

Hsin Hsin Chang^{Author Vitae}  I. Chen WangAuthor Vitae 《International Journal of Information Management》2011,31(2):171-182

Enterprise Information Portals (EIPs) have been widely adopted as platforms for the integration of knowledge management and information technology (IT). This study has been conducted from the knowledge management perspective in order to examine the influence of EIPs on collaborative commerce in the automobile industry. This study explores the integration of internal and external business processes and the coordination of collaborative design teams. An initial qualitative investigation explores the practical applications of an EIP in an automobile company. A research model is then formulated and tested using a questionnaire survey of the R&D department of a motor company in Taiwan. The results of the data analysis reveal that presence of EIPs can help a company realize the benefits of c-commerce. EIPs also can improve collaborative commerce performance by promoting the degree of integration of the enterprise process and by strengthening the process innovation and communication of collaborative design teams. The results suggest that managers should reinforce important factors, including knowledge management tools, process integration, and the quality of design teams, in order to achieve success in collaborative commerce.  相似文献   

Is the informationist a new role? A logic model analysis     

I. Diane Cooper 《Journal of the Medical Library Association》2011,99(3):189-192

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Urates in exhaled breath condensate of children with obstructive sleep apnea     

Vlasic V  Trifunovic J  Cepelak I  Nimac P  Topic RZ  Dodig S 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2011,21(2):139-144

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The dynamics of the impact and coalescence of droplets on a solid surface   总被引：1，自引：0，他引：1  

Castrejón-Pita JR  Betton ES  Kubiak KJ  Wilson MC  Hutchings IM 《Biomicrofluidics》2011,5(1):14112

A simple experimental setup to study the impact and coalescence of deposited droplets is described. Droplet impact and coalescence have been investigated by high-speed particle image velocimetry. Velocity fields near the liquid-substrate interface have been observed for the impact and coalescence of 2.4 mm diameter droplets of glycerol∕water striking a flat transparent substrate in air. The experimental arrangement images the internal flow in the droplets from below the substrate with a high-speed camera and continuous laser illumination. Experimental results are in the form of digital images that are processed by particle image velocimetry and image processing algorithms to obtain velocity fields, droplet geometries, and contact line positions. Experimental results are compared with numerical simulations by the lattice Boltzmann method.  相似文献