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Now showing items 21-30 of 183

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A NEW GENERALIZATION OF BOAS THEOREM FOR SOME LORENTZ SPACES Λq(ω) 

Kopezhanova, Aigerim; Nursultanov, Erlan; Persson, Lars Erik (Journal article; Tidsskriftartikkel; Peer reviewed, 2018)
Let Λq( ω ), q > 0, denote the Lorentz space equipped with the (quasi) norm [<i>MATHEMATICAL FORMULA</I>] for a function f on [0,1] and with ω positive and equipped with some additional growth properties. A generalization of Boas theorem in the form of a two-sided inequality is obtained in the case of both general regular system [<i>MATHEMATICAL FORMULA</I>] and generalized Lorentz Λq( ω ) spaces
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Weighted Hardy Operators in Complementary Morrey Spaces 

Lukkassen, Dag; Persson, Lars Erik; Samko, Stefan (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)
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A multi-objective mathematical programming for sustainable reverse logistics network design. Part I: Model formulation 

Yu, Hao; Solvang, Wei Deng; Solvang, Bjørn (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-02)
Reverse logistics has received more and more attention during the past decade due to the increasing public awareness of sustainable development. Because of the fluctuation in both quantity and quality of the reverse material flow, design and planning of reverse logistics network is much more complicated comparing with the forward ones. Therefore, it is important to develop decision support tools for ...
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On Some Power Means and Their Geometric Constructions 

Høibakk, Ralph; Lukkassen, Dag; Meidell, Annette; Persson, Lars Erik (Journal article; Tidsskriftartikkel; Peer reviewed, 2018)
The main aim of this paper is to further develop the recently initiatedresearch concerning geometric construction of some power means wherethe variables are appearing as line segments. It will be demonstratedthat the arithmetic mean, the harmonic mean and the quadratic meancan be constructed for any number of variables and that all power meanswhere the number of variables are n = 2m, m 1 2 N for all ...
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Transient Model of an RSW System with CO2 Refrigeration – A Study of Overall Performance 

Brodal, Eivind; Jackson, Steven; Eiksund, Oddmar (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-07)
Refrigerated seawater (RSW) cooling using CO2 based refrigeration is a relatively new technology that shows promising performance in cold climates. For being a refrigerant CO2 has a low global warming potential (GWP) and is therefore recognized as an environmentally friendly alternative if the unit is competitive on energy efficiency. However, RSW systems with CO2 have a significant reduction in ...
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Matrix factorization of multivariate Bernstein polynomials 

Dalmo, Rune (Journal article; Tidsskriftartikkel; Peer reviewed, 2015)
Ordinary univariate Bernstein polynomials can be represented in matrix form using factor matrices. In this paper we present the definition and basic properties of such factor matrices extended from the univariate case to the general case of arbitrary number of variables by using barycentric coordinates in the hyper-simplices of respective dimension. The main results in the paper are related to the ...
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Semi-Implicit Method for Pressure-Linked Equations (SIMPLE) – solution in MATLAB® 

Khawaja, Hassan; Moatamedi, Mojtaba (Journal article; Tidsskriftartikkel; Peer reviewed, 2018)
This work presents a method for the solution of fundamental governing equations of computational fluid dynamics (CFD) using the Semi-Implicit Method for Pressure-Linked Equations (SIMPLE) in MATLAB®. The fundamental governing equations of fluid mechanics are based on three laws of conservation, referred to as the law of conservation of mass, the law of conservation of momentum and the law of ...
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Numerical simulation of the dynamic response in pulse-loaded fibre–metal-laminated plates 

Nwankwo, Ebuka; Fallah, Arash Soleiman; Moatamedi, Mojtaba; Louca, Luke A. (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-07-27)
This article presents a three-dimensional constitutive model to replicate the dynamic response of blast-loaded fibre–metal laminates made of 2024-0 aluminium alloy and woven composite (glass fibre–reinforced polypropylene). Simulation of the dynamic response is challenging when extreme localised loads are of concern and requires reliable material constitutive models as well as accurate modelling ...
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Fluid solid interaction simulation of CFRP shell structure 

Khawaja, Hassan Abbas; Messahel, Ramzi; Souli, Mhmed; Al-Bahkali, Essam; Moatamedi, Mojtaba (Journal article; Tidsskriftartikkel; Peer reviewed, 2017)
This work attempts to model the dynamic behavior of Carbon Fiber Reinforced Polymer (CFRP) shell structure subjected to water shock wave to improve the results presented in the study by Khawaja et al., 2014. In the previous study, the real physical problem was simplified by decoupling the fluid and the structural phenomena, applying the recorded experimental fluid pressure load to the CFRP shell ...
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A Decoupled Approach for Flight Control 

Oland, Espen; Kristiansen, Raymond (Journal article; Tidsskriftartikkel; Peer reviewed, 2016)
A decoupling method for flight control is presented that greatly simplifies the controller design. By approximating the higher order derivatives of the angle of attack and sideslip, it enables a rotation controller and a speed controller to be derived independently of each other, and thus gives access to a vast number of controller solutions derived for general classes of rotational and translational ...
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Filter by Date Issued2010 - 2020 (182)2009 - 2009 (1)Filter by Document Type
Journal article (183)
Peer reviewed (179)Tidsskriftartikkel (159)Chapter (1)Filter by AuthorPersson, Lars Erik (26)Mustafa, Mohamad (16)Khawaja, Hassan (14)Moatamedi, Mojtaba (14)Piatnitski, Andrey (12)Virk, Muhammad Shakeel (12)Yu, Hao (11)Lukkassen, Dag (10)Mughal, Umair Najeeb (10)Solvang, Wei Deng (10)... View More
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