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Modelica Based Grade Change Optimization for a Polyethylene Reactor

This paper presents a dynamic optimization procedure of grade changes of polyethylene production. The optimization is built upon a novel modular Modelica library containing e.g., non-linear DAE models for polyethylene reactors based on models currently used in nonlinear MPC of industrial reactors at Borealis AB. Using Optimica, which extends the Modelica language with constructs for optimization p

An exploration of leisure shopping in retail store environments: Illuminating meanings, manifoldness and dynamics in consumers shopping experiences

Shopping has since long been recognized as a possible source of enjoyment. It has been argued that consumers of today devote ever more of their spare time to shopping. Within the domain of marketing, scholars have been successful in outlining consumers' motives for engaging in shopping as a leisure-time enjoyment. Minor attention has however been devoted to explorations of how or why such shopping

Unified frameworks for sampled-data extremum seeking control: Global optimisation and multi-unit systems

Two frameworks are proposed for extremum seeking of general nonlinear plants based on a sampled-data control law, within which a broad class of nonlinear programming methods is accommodated. It is established that under some generic assumptions, semi-global practical convergence to a global extremum can be achieved. In the case where the extremum seeking algorithm satisfies a stronger asymptotic s

Nonmagnetic ultra wideband absorber with optimal thickness

Design of ultra wideband absorbers with bandwidth ratios larger than 10:1 is investigated. It is explained that if there is no constraint on the total thickness of the absorber, achieving large bandwidths is straightforward. The problem becomes challenging when the minimization of the total thickness is considered. It is shown that for a given frequency response, the total thickness of a nonmagnet

Emergence of future tense based on socio-cognitive factors

It can be claimed that the emergence of the future tense is closely related to cognitive and cultural artefacts from our earlier civilisations, such as burial practices and concepts of afterlife. In this paper, we present one such specific case concerning the concept of zero. The zero and nothingness have haunted earlier thinkers, philosophers and theologians alike, since the idea of ex nihil ‘out