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Astudillo, R. (author), Van Gijzen, M.B. (author)A new algorithm to compute eigenpairs of large unsymmetric matrices is presented. Using the Induced Dimension Reduction method (IDR), which was originally proposed for solving linear systems, we obtain a Hessenberg decomposition from which we approximate the eigen-values and eigenvectors of a matrix. This decomposition has two main advantages....report 2014
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Verheij, H.J. (author), Hoffmans, G. (author), Den Adel, H. (author), Akkerman, G.J. (author), Giri, S. (author)A desk study has been carried out regarding interface stability of granular filter structures. Actually, the project focuses on two particular aspects: (1) interface stability as function of the thickness of the filter layer consisting of standard armourstone gradings, and (2) interface stability of gravel mixtures with a wide gradation The...report 2009
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- Weerts, A.H. (author), Klis, H. van der (author) report 2004
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Maggi, F. (author)The measuring of the flocculation parameters is based on the analysis of the optical records obtained with the settling column. These records consist of images of aggregates or flocs grabbed with a digital camera. Flocs are lightened by means of a laser sheet coming from the side. The laser light is scattered by the flocs and recorded by the...report 2003
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- Klein Breteler, M. (author) report 2002
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Hofland, B. (author)The second chapter describes the general methodology of the research. It presents the key questions about the entrainment of stones from granular filters that are as yet unanswered. It also describes the aspects that are being regarded in the analysis in this report. In chapter 3 the measuring set-up is described. The following two chapters...report 2001
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- Jongeling, T.H.G. (author), Verheij, H.J. (author) report 2001
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Hofland, B. (author)This report is structured as follows: In chapter 2 the importance of wall pressures with respect to the present research is described. The literature on wall pressures that was used, and some general features of wall pressure fluctuations are subsequently described in chapter 3. Chapter 4 deals with the pressure sensors. It begins with a brief...report 2001
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Hofland, B. (author)In order to understand the processes involved in damaging a granular filter, the behaviour of the separate particles it is made of must be known. The hydrodynamic forces on the particles are very important for understanding this behaviour. These forces have been examined by many researchers. Chapter 2 deals with that aspect. The characteristics...report 2000
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- Verheij, H.J. (author), Adel, H. den (author), Petit, H.A.H. (author) report 2000
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- Smith, G.M. (author), Klein Breteler, M. (author) report 2000
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- Klein Breteler, M. (author) report 2000
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- Klein Breteler, M. (author) report 2000
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Hoffmans, G.J.C.M. (author), Den Adel, H. (author), Verheij, H.J. (author)Scour is a natural phenomenon caused by the flow of water in rivers and streams and occurs as a part of the morphological changes caused by rivers or as a result of man-made structures. For the Dutch Delta Works hydraulic structures were often constructed on fines with loose packing. To guarantee the geotechnical stability of these structures...report 2000
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- Waal, J.P. de (author), Klein Breteler, M. (author) report 1999
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Vrijling, J.K. (author), Hauer, M. (author), Van der Meulen, T. (author)Dit rapport betreft het verslag van een studie naar de variatie in kwaliteit van granulaire materialen bij toepassingen in filterconstructies. De onderzochte kwaliteit betrof daarbij zowel de homogeniteit van het materiaal als de bij de uitvoering van lagen gerealiseerde laagdiktes. Als gevolg van ontmenging kan het materiaal in een constructie...report 1999
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- Verheij, H.J. (author) report 1999
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Vrijling, J.K. (author), Hauer, M. (author), Van der Meulen, T. (author)Het verschijnsel ontmenging is al sinds lang een bekend fenomeen bij ontwerpers en constructeurs van granuiaire constructies. Desalniettemin is nog altijd erg weinig bekend over de aard en de omvang van de gevolgen die het optreden van dit verschijnsel voor het functioneren van een constructie kan hebben. Tot op heden bleven de beschouwingen...report 1998
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Verheij, H.J. (author)Recently, a number of desk studies have been carried out with respect to the phenomena in and the design of granular filters. These have resulted in some formulas allowing the dimensioning of granular filters. The most important formulas are those developed by Hoffmans based on the shear stress concept of Grass (indicated hereafter as the...report 1998
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- Verheij, H.J. (author) report 1998