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M. Sami Fadali 《Journal of The Franklin Institute》2011,348(2):239-260
In this paper, we use input and output maps to develop simple procedures to obtain minimal realizations for linear continuous-time systems. The procedures developed are numerically efficient and yield explicit formulae for the state-space matrices of the realization in terms of the system parameters, notably the system eigenvalues. Both systems with distinct eigenvalues and repeated eigenvalues are treated. We also present a procedure for transforming a realization obtained through the input or output map to Jordan canonical form. The transformation matrices required to transform the realization to Jordan canonical form are specified entirely in terms of the system eigenvalues. We illustrate the results obtained with several examples. 相似文献
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Tugba Temiz Mustafa Sami Topcu 《European Journal of Psychology of Education - EJPE》2013,28(4):1435-1452
The purpose of this paper is to explore the relationship between preservice teachers’ (PTs) teacher efficacy beliefs and their constructivist-based teaching practices. Data were gathered through the questionnaire (Teachers’ Sense of Efficacy Scale) and the observation protocol (Reformed Teaching Observation Protocol) administered to the participants. A total number of 101 PTs (53.5 % from science education and 46.5 % from mathematics education) from a university in eastern part of Turkey participated in the study. Also, qualitative data were also used in order to clarify quantitative data. The semistructured interviews were conducted with 20 PTs who voluntarily participated in these interviews. Results showed that PTs’ constructivist-based teaching practice was positively correlated with their teacher efficacy beliefs. Also, qualitative findings confirmed that finding. To conclude, PTs with high teacher efficacy tend to employ constructivist approach in their teaching while PTs with low teacher efficacy tend to use traditional approach, lecturing in their teaching. 相似文献
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Functional scientific literacy demands an informed citizenry capable of negotiating controversial socioscientific issues (SSI). Perspective taking is critical to SSI implementation as it enables understanding of the diverse cognitive and emotional perspectives of others. Science teacher educators must therefore facilitate teachers’ promotion of classroom environments that value diverse perspectives. The purpose of this theoretical paper is to propose the HARTSS model through which successful practices that promote perspective taking in the humanities, arts, and social sciences are identified and translated into socioscientific contexts, thereby developing an array of promising interventions designed for science teacher educators to foster perspective taking in current and future science teachers and their students. 相似文献
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Sami Alrabaa 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1985,31(1):335-348
The sexist division of labour, particularly in the occupational sector, which is believed to be more eminent in developing countries than in the developed ones, is reinforced by school textbooks. This state of affairs is hampering sex-role equality on the way to emancipation. Various Syrian school textbooks have been scrutinized and proved to be malebiased in content and language. Despite quantitative growth of education, the emancipatory quality of the school textbooks leaves much to be desired. The government has had the chance since 1963 to produce textbooks conductive to its promise of sex-role equality in education. The textbooks portray males for a bustling world of decision making, while conditioning the females to seek fulfilment in the background where servitude and support are the only requirement. Females are derogated and victimized. These contents, which are internalized at school and reproduced in society, certainly do not serve development. The exclusion of one-half of the population from contributing to the tasks of development is a waste of human talent which no society can afford. Furthermore, the sexist portrayal of females in Syrian textbooks is a pale reflection of Arab women in Arab history and literature. 相似文献
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Mahar AN Munir M Elawad S Gowen SR Hague NG 《Journal of Zhejiang University. Science. B》2005,6(6):457-463
INTRODUCTION Entomopathogenic nematodes of the generaSteinernema and Heterorhabditis have been used tocontrol a wide range of agriculturally important insectpests (Kaya and Gaugler, 1993). The mechanism bywhich these nematodes are able to infect and repro-duce in the insect host involves a mutual relationshipbetween the nematode and the symbiotic bacteria,Xenorhabdus spp. and Photorhabdus spp. (Akhurstand Dunphy, 1993; Forst and Nealson, 1996). Poinarand Thomas (1966) established tha… 相似文献
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Age-related differences in acceleration, maximum running speed, and repeated-sprint performance in young soccer players 总被引：2，自引：2，他引：0
Mendez-Villanueva A Buchheit M Kuitunen S Douglas A Peltola E Bourdon P 《Journal of sports sciences》2011,29(5):477-484
We investigated age-related differences in the relationships among acceleration, maximum running speed, and repeated-sprint performance in 61 highly trained young male soccer players (Under 14, n = 14; Under 16, n = 22; Under 18, n = 25). We also examined the possible influence of anthropometry (stature, body mass, fat-free mass) and biological maturation (age at peak height velocity) on performance in those three sprint-running qualities. Players were tested for 10-m sprint (acceleration), flying 20-m sprint (maximum running speed), and 10 × 30-m sprint (repeated-sprint performance) times. Correlations between acceleration, maximum running speed, and repeated-sprint performance were positive and large to almost perfect (r = 0.55-0.96), irrespective of age group. There were age-based differences both in absolute performance in the three sprint-running qualities (Under 18 > Under 16 > Under 14; P < 0.001) and when body mass and fat-free mass were statistically controlled (P < 0.05). In contrast, all between-group differences disappeared after adjustment for age at peak height velocity (P > 0.05). The large correlations among acceleration, maximum running speed, and repeated-sprint performance in all age groups, as well as the disappearance of between-group differences when adjusted for estimated biological maturity, suggest that these physical qualities in young highly trained soccer players might be considered as a general quality, which is likely to be related to qualitative adaptations that accompany maturation. 相似文献
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Sami Yli-Piipari 《Quest (Human Kinetics)》2013,65(4):468-484
The Finnish education system has received worldwide attention due to the top academic performance of Finnish school students. Physical education, as an integral part of the Finnish education curriculum, potentially contributes to the overall success. The purpose of this article is to summarize Finnish physical education reform during the past decades and to review and critique recent literature that has examined the effectiveness of Finnish physical education programs. This review concludes that physical education has a solid foundation in Finnish schools and that it enjoys strong support in Finnish society. Although physical education contact time has diminished across four decades, the current basic education reform has begun to allocate more time and funding for elementary and middle school physical education. The literature review, however, revealed limited evidence on the effectiveness of physical education programs. In the future, robust studies are needed to provide evidence of the effectiveness of physical education. It is likely that with rigorous research evidence, the current efforts to allocate more time for physical education should be more easily justified and supported. 相似文献
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