Blar i NTNU Open på forfatter "Owren, Brynjulf"

Predicting football tables by a maximally parsimonious model
Haugen, Kjetil K.; Owren, Brynjulf (Journal article; Peer reviewed, 2018)This paper presents some useful mathematical results concerned with football table prediction. In addition, some empirical results indicate that an alternative methodology for football table prediction may produce high ... 
Preservation of multiple first integrals in partial differential equations
Aune, Trygve (Master thesis, 2017)A wide variaty of partial differential equations have preserved entities like invariants and first integrals. In this thesis we will go into theory regarding preservation of such first integrals. Finally we will have the ... 
Robustness in supply chain management and design
Sværen, Martin Aspebakken (Master thesis, 2010)We have studied a supply chain for delivering biomass to heating plants where there are uncertainty in demand. Design of such supply chains considers finding the optimal terminal structure and an optimal inventory policy. ... 
The Heterogeneous Multiscale Method and the Spinning Top
Fredbo, Maren (Master thesis, 2011)The heterogeneous multiscale method (HMM) was proposed by E and Engquist and is considered to be an efficient method for problems with multiple time scales. We give a short introduction to the HMM for multiscale problems ... 
THE INVESTIGATION OF APPROPRIATE CONTROL ALGORITHMS FOR THE SPEED CONTROL OF WIND TURBINE HYDROSTATIC SYSTEMS
Gulstad, Magnus Johan (Master thesis, 2007)This report consists of two chapters. The first is concerned with a new approach to pipe flow modelling and the second has to do with the simulation of the hydrostatic system which will be applied to a wind turbine.For the ... 
Three classes of quadratic vector fields for which the Kahan discretization is the root of a generalised Manin transformation
van der Kamp, Peter H.; Celledoni, Elena; Mclachlan, Robert, i; McLaren, David I.; Owren, Brynjulf; Quispel, Gilles Reinout Willem (Peer reviewed; Journal article, 2019)Three classes of quadratic vector fields for which the Kahan discretization is the root of a generalised Manin transformation 
Two classes of quadratic vector fields for which the Kahan discretization is integrable
Celledoni, Elena; McLachlan, I. Robert; McLaren, David; Owren, Brynjulf; Quispel, Reinout (Journal article, 2016) 
Using discrete Darboux polynomials to detect and determine preserved measures and integrals of rational maps
Celledoni, Elena; Evripidou, Charalambos; McLaren, David I.; Owren, Brynjulf; Quispel, Gilles Reinout Willem; Tapley, Benjamin; van der Kamp, Peter H. (Peer reviewed; Journal article, 2019)In this letter we propose a systematic approach for detecting and calculating integrals and preserved measures of rational maps. The approach is based on the use of cofactors and discrete Darboux polynomials and relies on ... 
Variable step size commutator free Lie group integrators
Curry, Charles Henry Alexander; Owren, Brynjulf (Journal article; Peer reviewed, 2019)We introduce variable step size commutator free Lie group integrators, where the error control is achieved using embedded Runge–Kutta pairs. These are schemes for the integration of initial value problems posed on homogeneous ...