Blar i NTNU Open på forfatter "Leth, John"
-
A heat equation for freezing processes with phase change: stability analysis and applications
Backi, Christoph Josef; Bendtsen, Jan Dimon; Leth, John; Gravdahl, Jan Tommy (Journal article, 2016)In this work, the stability properties as well as possible applications of a partial differential equation (PDE) with state-dependent parameters are investigated. Among other things, the PDE describes freezing of foodstuff, ... -
Estimation of inner-domain temperatures for a freezing process
Backi, Christoph Josef; Bendtsen, Jan Dimon; Leth, John; Gravdahl, Jan Tommy (Journal article; Peer reviewed, 2014)In this paper a state observer for a distributed parameter system (DPS) with nonconstant parameter functions is presented. The DPS describes the freezing of foodstuff in vertical plate freezers and is a nonlinear heat ... -
Optimal boundary control of a contact thawing process for foodstuff
Backi, Christoph Josef; Leth, John; Gravdahl, Jan Tommy (Journal article, 2016)In this work an approach for thawing blocks of foodstuff, in particular fish, is introduced. The functional principle is based on plate freezer technology, which has been used in industry for decades. The aim of this work ... -
Stability properties of a heat equation with state-dependent parameters and asymmetric boundary conditions
Backi, Christoph Josef; Bendtsen, Jan Dimon; Leth, John; Gravdahl, Jan Tommy (Journal article; Peer reviewed, 2015)In this work the stability properties of a partial differential equation (PDE) with statedependent parameters and asymmetric boundary conditions are investigated. The PDE describes the temperature distribution inside ... -
The nonlinear heat equation with state-dependent parameters and its connection to the Burgers’ and the potential Burgers’ equation
Backi, Christoph Josef; Bendtsen, Jan Dimon; Leth, John; Gravdahl, Jan Tommy (Journal article; Peer reviewed, 2014)In this work the stability properties of a nonlinear partial differential equation (PDE) with state dependent parameters is investigated. Among other things, the PDE describes freezing of foodstuff, and is closely related ...