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783 results on '"Mattheij, R.M.M."'

102. A general compound multirate method for circuit simulation problems

Author

Verhoeven, A., El Guennouni, A., Maten, ter, E.J.W., Mattheij, R.M.M., Anile, A.M., Ali, G., Mascali, G., and Scientific Computing

Subjects
Equivalent circuit, Control engineering, ComputingMilieux_LEGALASPECTSOFCOMPUTING, Transient analysis, Stability (probability), Mathematics, Electronic circuit, Numerical stability
Abstract

The "General Compound" multirate methods are attractive integration methods for the transient analysis of mixed analog-digital circuits. From a stability analysis, it follows that they have good stability properties.

Published
2004

116. The changing scene for mathematics

Author

Mattheij, R.M.M., Casacuberta, C., Miro-Roig, R.M., Ortega, J.M., Xambo-Descamps, S., Scientific Computing, and Research on miscellaneous topics in mathematics, not included in one of the research schools

Published
2002

120. Applying local defect correction technique to BEM

Author

Berchmans, H.J., Mattheij, R.M.M., Scientific Computing, and Scientific Computing - MATTeR

Subjects
TheoryofComputation_LOGICSANDMEANINGSOFPROGRAMS, ComputingMethodologies_DOCUMENTANDTEXTPROCESSING, GeneralLiterature_MISCELLANEOUS, ComputingMethodologies_COMPUTERGRAPHICS
Published
2002

123. Alternative DRM formulations

Author

Wang, K., Mattheij, R.M.M., Morsche, ter, H.G., Scientific Computing, and Mathematics and Computer Science

Subjects
ComputingMilieux_LEGALASPECTSOFCOMPUTING
Published
2002

126. Simulation of flow in a glass tank

Author

Nefedov, V., Mattheij, R.M.M., Cioranescu, D., Lions, J.L., and Scientific Computing

Subjects
Materials science, Flow (mathematics), Mechanics
Abstract

No abstract.

Published
2002

127. Modelling laser induced melting

Author

Verhoeven, J.C.J., Jansen, J.K.M., Mattheij, R.M.M., Smith, W.R., Scientific Computing, and Mathematics and Computer Science

Subjects
TheoryofComputation_LOGICSANDMEANINGSOFPROGRAMS, ComputingMethodologies_DOCUMENTANDTEXTPROCESSING, GeneralLiterature_MISCELLANEOUS, ComputingMethodologies_COMPUTERGRAPHICS
Published
2001

128. Modelling glass parisons

Author

Mattheij, R.M.M., Morsche, ter, H.G., Wang, K., Kassab, A.J., Aliabadi, M.H., Scientific Computing, and Mathematics and Computer Science

Published
2001

129. BEM simulation for the pressing of glass

Author

Wang, K., Mattheij, R.M.M., Morsche, ter, H.G., Kassab, A.J., Aliabadi, M.H., Scientific Computing, and Mathematics and Computer Science

Published
2001

131. A residual based adaptive BEM

Author

Mattheij, R.M.M., Wang, K., Denda, M., Aliabadi, M.H., Charafi, A., Scientific Computing, and Mathematics and Computer Science

Published
2001

138. A derivative-based fast autofocus method in electron microscopy

Author

Rudnaya, M., Morsche, ter, H.G., Maubach, J.M.L., Mattheij, R.M.M., Rudnaya, M., Morsche, ter, H.G., Maubach, J.M.L., and Mattheij, R.M.M.

Abstract

Most automatic focusing methods are based on a sharpness function, which delivers a real-valued estimate of an image quality. In this paper, we study an L 2-norm derivative-based sharpness function, which has been used before based on heuristic consideration. We give a more solid mathematical foundation for this function and get a better insight into its analytical properties. Moreover an efficient autofocus method is presented, in which an artificial blur variable plays an important role. We show that for a specific choice of the artificial blur control variable, the function is approximately a quadratic polynomial, which implies that after the recording of at least three images one can find the approximate position of the optimal defocus. This provides the speed improvement in comparison with existing approaches, which usually require recording of more than ten images for autofocus. The new autofocus method is employed for the scanning transmission electron microscopy. To be more specific, it has been implemented in the FEI scanning transmission electron microscope and its performance has been tested as a part of a particle analysis application.

Published
2012

140. Numerical methods for simulating vortices in 2D flows

Author

Schoemaker, R.M., Haas, de, P.C.A., Clercx, H.J.H., Mattheij, R.M.M., Heijst, van, G.J.F., Center for Analysis, Scientific Computing & Appl., Fluids and Flows, Scientific Computing, and Transport in Turbulent Flows

Abstract

only.

Published
2000

148. Taal, tuig en tech

Author

Mattheij, R.M.M. and Mattheij, R.M.M.

Abstract

Taal is een communicatiemiddel met gebruiksaanwijzing. Ook wiskunde kan als taal opgevat worden en heeft daarmee een aantal kenmerken met gewone taal gemeen. Wiskunde is bij uitstek geschikt om onze fysische omgeving te beschrijven. In dit college wordt ingegaan op een aantal aspecten hiervan evenals de rol die wiskundigen kunnen spelen bij de valorisatie van hun vakgebied.

Published
2011

149. Modelling stretch blow moulding of polymer containers using level set methods

Author

Groot, J.A.W.M., Giannopapa, C.G., Mattheij, R.M.M., Groot, J.A.W.M., Giannopapa, C.G., and Mattheij, R.M.M.

Abstract

Stretch blow moulding is a widely used technique e.g. for the production of PET bottles. In a stretch blow moulding process a hot preform of polymer is simultaneously stretched and blown into a mould shape. The process takes place at a fast rate and is characterised by large deformations and temperature gradients. In this paper a computer simulation model for stretch blow moulding is presented. The model is based on finite element methods and uses a level set method to track the interfaces between air, polymer and stretch rod. The PET behaviour is modelled as a non-newtonian, isothermal fluid flow, based on a viscoplastic material model. An application presented is the stretch blow moulding of a realistic PET water bottle. The model is validated by verifying volume conservation.

Published
2011

150. A derivative-based fast autofocus method

Author

Rudnaya, M., Morsche, ter, H.G., Maubach, J.M.L., Mattheij, R.M.M., Rudnaya, M., Morsche, ter, H.G., Maubach, J.M.L., and Mattheij, R.M.M.

Abstract

Most automatic focusing methods are based on a sharpness function, which delivers a real-valued estimate of an image quality. In this paper, we study an L2-norm derivative-based sharpness function, which has been used before based on heuristic consideration. We give a more solid mathematical foundation for this function and get a better insight into its analytical properties. Moreover an efficient autofocus method is presented, in which an artificila blur variable plays an important role. We show that for a specific choice of the artificial blur control variable, the function is approximately a quadratic polynomial, which implies that after obtaining of at least three images one can find the approximate position of the optimal defocus. This provides the speed improvement in comparison with existing approaches, which usually require recording of more than ten images for autofocussing. The new autofocus method is employed for the scanning transmission electron microscopy. To be more specific, it has been implemented in the FEI scanning transmission electron microscope and its performance has been tested as a part of a particle analysis application.

Published
2011

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