排序方式： 共有73条查询结果，搜索用时 15 毫秒
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António M. Teixeira 《The American journal of distance education》2013,27(4):231-233
The purpose of this study was to determine the efficacy of traditionally spoken linguistic analysis approaches for understanding the nature and outcomes of online interaction. The study took place with twenty-eight elementary school teachers in ten suburban Chicago schools involved in a technology-supported, problem-based learning curriculum development effort. The asynchronous and face-to-face communications of participants were monitored to test the utility of linguistic discourse variables for understanding interaction. The evidence showed that similar sense-making and interaction strategies are used in both face-to-face and online dialogue but that the strategies were significantly more prevalent in the face-to-face than online dialogue. When critical reflection was studied as an outcome of both forms of dialogue, asynchronous electronic communication was significantly more reflective than face-to-face discourse. 相似文献
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Luísa Veiga Filomena Teixeira Isabel Martins António Meliço‐Silvestre 《Sex education》2013,13(1):17-29
Sex education in Portugal has become a right and an obligation starting in the first years of school. However, despite being required by legislation, this is not easy to achieve, partly because of weaknesses in the training of teachers, which need to be identified. In this study, data were collected about the knowledge, behaviours and beliefs of 148 teacher trainees of elementary education (6–10 years old) from two Portuguese public higher education institutions. The topic of sexuality and human reproduction had been covered by almost all of them during their initial training and was considered important by most of them. Nevertheless, about 85% asserted they are not confident enough to teach this topic to small children in a classroom and committed scientific errors about physiological‐anatomical aspects of the human body. All subjects felt that there is a lack of specific didactic materials, which does not help to overcome those obstacles. It was also possible to identify in these future teachers risky sexual practices resulting, in part, from their beliefs, which could have implications about the way the topic will be approached in the classroom. These findings show how essential it is for training institutions to pay greater attention to the education of future elementary school teachers in this area. 相似文献
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M.S. Lemos C. Queirós P.M. Teixeira I. Menezes 《Assessment & Evaluation in Higher Education》2011,36(7):843-864
The authors describe the development and validation of a multidimensional instrument of students’ evaluation of university teaching (the Pedagogical Questionnaire of the University of Porto). The goal was to develop an instrument based on a sound psychometric analysis and simultaneously supported by the learning theory. Based on the data from 4875 questionnaires, the present study examined the fit of the proposed multidimensional model of university teaching to the whole sample and to various specific university programmes of study using confirmatory factor analysis (AMOS 5.0). Results clearly supported the applicability of the proposed model for the whole university and across programmes of study, demonstrating the validity and reliability of the instrument in evaluating several distinct dimensions of the quality of university teaching. 相似文献
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Renato Borba Teixeira Tiago Roux Oliveira Ramon Romankevicius Costa Liu Hsu 《Journal of The Franklin Institute》2021,358(3):1715-1742
The problem of adaptive control design for multivariable linear time-invariant plants with unknown control direction is considered. A solution is proposed based on the SDU factorization of the high frequency gain matrix (HFG) and the monitoring function approach. The adaptation scheme is the binary model reference adaptive control (BMRAC) which utilizes parameter projection and sufficiently high adaptation gains. The signs of the leading principal minors of the HFG define the control directions, and the lack of knowledge of which is a major challenge in the multivariable framework. The role of the monitoring function is to monitor the output error transient and then provide the necessary changes of the adaptation gain signs to guarantee a stable adaptive control. In addition to proving the signal boundedness of the resulting closed-loop system, the output tracking error is shown to be asymptotically as well as exponentially practically stable, i.e., exponentially stable with respect to a small residual compact set of size inversely proportional to the BMRAC adaptation gain. The latter implies good transient properties of the output tracking error in contrast to conventional adaptive laws which only guarantee asymptotic stability but can lead to extremely slow error convergence. The extension of the proposed approach to matched disturbances is also briefly discussed following the classical paradigm of disturbance estimators. Numerical results with a visual servoing application illustrate the efficiency of the proposed method. 相似文献
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Teixeira LA de Oliveira DL Romano RG Correa SC 《Research quarterly for exercise and sport》2011,82(1):21-27
To examine the effect of long lasting practice on pedal behavior in sport, we compared experienced adult soccer players and nonsoccer players on leg preference in motor tasks requiring general mobilization, soccer related mobilization, and body balance stabilization. We also evaluated performance asymmetry between the right and left legs in static and dynamic unipedal body balance, based on center of pressure displacement, and correlated that with leg preference in balance stabilization tasks. Results revealed (a) a distinct leg preference between mobilization and stabilization tasks, which were significantly different between players and nonplayers, (b) similar balance stability between the right and left legs, (c) greater stability of experienced players compared with nonplayers in static and dynamic balance, and (d) absence of a significant leg preference correlation with interlateral balance asymmetry. These results suggest an effect of extensive soccer skill practice on establishing leg preference for specific mobilization tasks and overall balance control. 相似文献
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This paper contributes to the scarce empirical literature on the impact of foreign ownership on human capital intensity. New evidence is provided, based on a comprehensive, large-scale survey of technology-based firms located in Portugal. The key findings are that: (1) foreign ownership directly (and significantly) impacts a firm's general human capital (education); (2) foreign ownership indirectly (and significantly) impacts a firm's specific human capital (skills); (3) the total impact of foreign ownership on a firm's human capital intensity is higher for education- (general) than for skills- (specific) related human capital intensity. Giving the critical importance of both FDI and human capital development for an ‘intermediate’ economy like Portugal (lagging behind in terms of human capital stock, and seeming to have lost part of its attractiveness as an FDI location), the paper discusses related policy implications. It is believed that our results and conclusions may be useful for other countries facing similar challenges. 相似文献