Search results for "41"
showing 10 items of 3365 documents
Elever og læreboken : en casestudie om læreboken sin rolle hos matematikkelever
2011
Masteroppgave i matematikkdidaktikk- Universitetet i Agder 2011 Students and the textbook is a case study of the role of the textbook among students. When a textbook is used in lessons, it is likely that a relation between the text and pupils will develop. Then, it is reasonable to assume that the students are influenced by the textbook in one way or the other. This study sets out to illustrate any relation that might exist between students understanding and the way in which they use the textbook. I have attempted to identify what is characteristic of each student’s understanding, although realizing the impossibility to determine anyone’s perception with certainty. To classify the students …
Procedural and conceptual knowledge among upper secondarystudents : the case of second degree polynomials
2010
Masteroppgave i matematikkdidaktikk- Universitetet i Agder 2010 This study is concerned with conceptual and procedural knowledge of second degree polynomials. I try to give an account of a group of students’ knowledge of this topic The research questions I pose are the following: - How fluent are the students with respect to the algorithms for problem solving where quadratic polynomials are involved? - Can one find indications that the students possess any conceptual knowledge of the subject? I provide an overview of the relevant literature, with a focus on how these knowledge types relate to each other, how they influence one another, which instructional strategies are suited to instill th…
Utvikling av inquirybasert matematikkundervisning : en kasusstudie av læreres tolkning og bruk av en inquiryinspirert læringsfilosofi formidlet gjenn…
2012
Masteroppgave i matematikkdidaktikk- Universitetet i Agder, 2012 The development project LBM – Learning Better Mathematics – took place in schools and kindergartens in Vest-Agder from 2007 to 2010. Two years after its end, I investigate the practice and the beliefs about learning and teaching of mathematics of four former participants, and I`m particularly interested in how these teachers interpret and implement an inquiry inspired learning philosophy. This means, instruction where the students are active and explore mathematics together, but it`s also about the teachers own professional development through exploration and community with others. The intention is not to evaluate the project …
Convective Roll Instabilities of Vertical Throughflow with Viscous Dissipation in a Horizontal Porous Layer
2009
Published version of an article from the journal: Transport in Porous Media. The original publication is available at Spingerlink. http://dx.doi.org/10.1007/s11242-009-9417-y The vertical throughflow with viscous dissipation in a horizontal porous layer is studied. The horizontal plane boundaries are assumed to be isothermal with unequal temperatures and bottom heating. A basic stationary solution of the governing equations with a uniform vertical velocity field (throughflow) is determined. The temperature field in the basic solution depends only on the vertical coordinate. Departures from the linear heat conduction profile are displayed by the temperature distribution due to the forced con…
Structural Vibration Control for a Class of Connected Multistructure Mechanical Systems
2012
Published version of an article from the journal: Mathematical Problems in Engineering. Also available from the publisher:http://dx.doi.org/10.1155/2012/942910 A mathematical model to compute the overall vibrational response of connected multistructure mechanical systems is presented. Using the proposed model, structural vibration control strategies for seismic protection of multibuilding systems can be efficiently designed. Particular attention is paid to the design of control configurations that combine passive interbuilding dampers with local feedback control systems implemented in the buildings. These hybrid active-passive control strategies possess the good properties of passive contro…
Discrete-time multioverlapping controller design for structural vibration control of tall buildings under seismic excitation
2012
Published version of an article from the journal: Mathematical Problems in Engineering. Also available from the publisher:http://dx.doi.org/10.1155/2012/636878 In this paper, a computationally effective strategy to obtain multioverlapping controllers via the Inclusion Principle is applied to design discrete-time state-feedback multioverlapping LQR con- trollers for seismic protection of tall buildings. To compute the corresponding control actions, the proposed semidecentralized controllers only require state information from neighboring stories. This particular configuration of information exchange allows introducing a dramatic reduction in the transmission range required for a wireless imp…
Optimization of Biodiesel Injection Parameters Based on Support Vector Machine
2013
Published version of an article in the journal: Mathematical Problems in Engineering. Also available from Hindawi: http://dx.doi.org/10.1155/2013/893084. Open Access For the running diesel engine, spray-atomization, mixed-combustion, and thermal-power conversion processes are inseparable, which causes difficulty to investigate atomization effect separately. This study was conducted to improve the atomization efficiency of the soybean fatty acid methyl ester (SFAME) in engine, to achieve the minimum effective specific fuel consumption in specific engine working conditions, the different injection parameters combination were explored on the influence of effective specific fuel consumption at …
Active-passive control strategy for adjacent buildings
2011
Author's version of a chapter in the book: 2011 Proceedings of the American Control Conference. Also available from the publisher at: http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=05991059 In this paper, a control strategy to mitigate the vibrational response of adjacent buildings under seismic excitation is presented. The proposed strategy combines inter-building passive actuators with active actuators placed in the building stories. The main ideas are presented by means of a simplified two-building model; however, a semi-decentralized overlapping approach via the inclusion principle has been used to impose a proper information exchange structure suitable for wireless control of larg…
Modeling and simulation of a High Pressure Roller Crusher for silicon carbide production
2011
Author's version of a chapter published in the book: 11th International Conference on Electrical Power Quality and Utilisation. Also available from the publisher at: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6128963&tag=1 This paper describes the modeling and simulation of High Pressure Roller Crusher (HPRC) for the production of silicon cabide grains. The study is to make a model for simulation of a High Pressure Roller Crusher. A High Pressure Roller Crusher (HPRC) is an important part in the production of silicon carbide, where the grains are crushed into powder form and then sieved into specified sizes based on its usage. This paper will present a model based on Johanson's…
Development of lumped-parameter mathematical models for a vehicle localized impact
2011
Published version of an article in the journal:Journal of Mechanical Science and Technology. Also available from the publisher on SpringerLink: http://dx.doi.org/10.1007/s12206-011-0505-x In this paper, we propose a method of modeling for vehicle crash systems based on viscous and elastic properties of the materials. This paper covers an influence of different arrangement of spring and damper on the models’ response. Differences in simulating vehicle-torigid barrier collision and vehicle-to-pole collision are explained. Comparison of the models obtained from wideband (unfiltered) acceleration and filtered acceleration is done. At the end we propose a model which is suitable for localized co…