The Experts below are selected from a list of 114 Experts worldwide ranked by ideXlab platform
P. J. Nicklasson - One of the best experts on this subject based on the ideXlab platform.
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On the stability and stabilization of quaternion equilibria of rigid bodies
Automatica, 2012Co-Authors: Rune Schlanbusch, Antonio Loria, P. J. NicklassonAbstract:We Study Attitude control of rigid bodies on quaternion coordinates under three mathematically different perspectives, depending on how the system dynamics are assumed to evolve. In the first case, we suppose that one equilibrium point is chosen a priori and a continuous controller is used under the assumption that the rigid body always spins in the same direction. In the second case, we relax the assumption that the sense of rotation is constant. Finally, a third scenario is considered in which hybrid (switching) control is used to choose the direction in which to spin, that is, both equilibria are continuously considered with regard to less energy consumption. It is showed that each of three scenarios must be treated in a different theoretical setting. A comparative Study in simulations is also provided.
Jacobus G. Maree - One of the best experts on this subject based on the ideXlab platform.
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Developing a Study Orientation Questionnaire in Mathematics for primary school students.
Psychological Reports, 2009Co-Authors: Jacobus G. Maree, Marthie Van Der Walt, Suria EllisAbstract:Summary.—The Study Orientation Questionnaire in Mathematics (Primary) is being developed as a diagnostic measure for South African teachers and counsellors to help primary school students improve their orientation towards the Study of mathematics. In this Study, participants were primary school students in the North-West Province of South Africa. During the standardisation in 2007, 1,013 students (538 boys: M age = 12.61; SD = 1.53; 555 girls: M age= 11.98; SD = 135; 10 missing values) were assessed. Factor analysis yielded three factors. Analysis also showed satisfactory reliability coefficients and item-factor correlations. Step-wise linear regression indicated that three factors (Mathematics anxiety, Study Attitude in mathematics, and Study habits in mathematics) contributed significantly (R2 = .194) to predicting achievement in mathematics as measured by the Basic Mathematics Questionnaire (Primary).
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Predicting success among first-year engineering students at the Rand Afrikaans University.
Psychological reports, 2003Co-Authors: Jacobus G. Maree, Anlia Pretorius, Riëtte J. EiselenAbstract:160 first-year students in the Engineering Faculty at the Rand Afrikaans University completed the Study Orientation Questionnaire in Mathematics and the Senior Aptitude Test Advanced. 100 students who passed and 40 who failed the first year scored significantly differently on three subtests, Calculations, Study Attitude in mathematics, and Problem-solving behaviour in mathematics. Step-wise linear regression showed a combination of three fields, namely, Calculations, Study Attitude in mathematics, and Mathematics anxiety, contributed significantly (R2 = 25.8%) towards predicting the first-year aggregate score of first-year engineering students.
Rosa María Farfán Márquez - One of the best experts on this subject based on the ideXlab platform.
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Attitudes of secondary school students towards work in learning situations
2015Co-Authors: María Del Socorro García González, Rosa María Farfán MárquezAbstract:The purpose of this paper is to characterize the Attitudes of Mexican secondary school students (12–15 years old) when carrying out mathematical activities. In order to Study Attitude, the tripartite model of Attitude was adopted and a methodological design was organized based on the adapted model. So far a learning situation focused on the subject of proportionality has been applied, in which we have been able to identify two Attitudes: Acceptance and collaboration.
Rune Schlanbusch - One of the best experts on this subject based on the ideXlab platform.
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On the stability and stabilization of quaternion equilibria of rigid bodies
Automatica, 2012Co-Authors: Rune Schlanbusch, Antonio Loria, P. J. NicklassonAbstract:We Study Attitude control of rigid bodies on quaternion coordinates under three mathematically different perspectives, depending on how the system dynamics are assumed to evolve. In the first case, we suppose that one equilibrium point is chosen a priori and a continuous controller is used under the assumption that the rigid body always spins in the same direction. In the second case, we relax the assumption that the sense of rotation is constant. Finally, a third scenario is considered in which hybrid (switching) control is used to choose the direction in which to spin, that is, both equilibria are continuously considered with regard to less energy consumption. It is showed that each of three scenarios must be treated in a different theoretical setting. A comparative Study in simulations is also provided.
Yu Huan Cui - One of the best experts on this subject based on the ideXlab platform.
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Current Status and Analysis of Study Interest of Higher Vocational Students
Advanced Materials Research, 2011Co-Authors: Yu Huan CuiAbstract:In the education of higher vocational school, the effect of intelligence factors is no longer important-most students have the similar level of intelligence, and the prominent effect is the nonintellectual factor. In the nonintellectual factors, character and emotion and other factors can weaken its effect function by students’ self allocation, however, the effect of Study motivation and Study Attitude on Study interest are playing a more and more important role. Put forward suggestions for cultivating the Study interest of higher vocational students on the basis of education incentive theory.
