Browsing Artikler, rapporter og annet (datateknologi og beregningsorienterte ingeniørfag) by Title
Now showing items 1029 of 91

Design of water shock tube for testing shell materials
(Journal article; Tidsskriftartikkel; Peer reviewed, 20140415)This paper presents design considerations for a shock tube experimental rig used to investigate the dynamic failure mechanisms of shell geometries subjected to water shock impact loading. In such setup, it is desirable that the drive pressure used within the tube can provide a wide range of impulsive loads on the test structures and some flexibility can be achieved on the applied pulse durations. ... 
Dynamic plastic response of beams subjected to localised pulse loads
(Journal article; Peer reviewed, 20181031)Localised blast loads give rise to high gradients of overpressure detrimental to structural elements as beams and plates. This article presents an analytical study on the dynamic plastic response of beams made of a ductile metallic material due to closein pulse pressure loading. The closein pressure load is characterised by a spatially varying function constant over a central region and exponentially ... 
Economic evaluation of the Power grid tariff for households With solar Power installed
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017)This paper focuses on alternative grid tariffs for household customers with roof top PVpanels ("prosumers"), and evaluates how alternative grid tariffs might affect the benefit from investing in a roof top PVpanel. The paper further shows how different orientations of the PVpanels can affect the benefits for the prosumers subjected to different grid tariffs (for example a power grid tariff), where ... 
Embeddings of weighted generalized Morrey Spaces into Lebesgue Spaces on fractal sets
(Journal article; Tidsskriftartikkel; Peer reviewed, 20191219)We study embeddings of weighted local and consequently global generalized Morrey spaces defined on a quasimetric measure set (X, d, μ) of general nature which may be unbounded, into Lebesgue spaces Ls(X), 1 ≤ s ≤ p < ∞. The main motivation for obtaining such an embedding is to have an embedding of nonseparable Morrey space into a separable space. In the general setting of quasimetric measure ... 
Equivalent integral conditions related to bilinear Hardytype inequalities
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019)Inﬁnitely many, even scales of, equivalent conditions are derived to characterize the bilinear Hardytype inequality under various ranges of parameters. 
Exact Asymptotic Expansion of Singular Solutions for the (2+1)D Protter Problem
(Journal article; Tidsskriftartikkel; Peer reviewed, 2012) 
Exploring benefits of using blending splines as transition curves
(Journal article; Tidsskriftartikkel; Peer reviewed, 20200619)Track geometry is a fundamental subject in railway construction. With the demand for increased capacity in terms of load and speed, the need for suitable transitions between consecutive track sections is highly relevant. Properly constructed transition curves lead to improved travel comfort, increased safety, and reduced wear. The well known clothoid curve is widely used as a transition curve; ... 
Exploring future C++ features within a geometric modeling context
(Peer reviewed; Conference object; Chapter, 201911)The development of the C++ programming language and its standard library has undergone a renaissance since the introduction of the C++11 standard, making the language more relevant than ever, through modern features, simplification and expansion of the standard library. Comparing past and future feature sets (C++17, C++20, ...) similar to comparing different programming languages. In this article ... 
Fejér and HermiteHadamard Type Inequalities for NQuasiconvex Functions
(Journal article; Tidsskriftartikkel; Peer reviewed, 20171228)Some new extensions and re finements of Hermite – Hadamard and Fejer type inequalities for functions which are N quasiconvex are derived and discussed. 
A field study of sensors for winter road assessment
(Journal article; Tidsskriftartikkel; Peer reviewed, 20200902)Winter road assessment is a research field with considerable progress over the last 10 years. Various sensors and methods have been tested and analysed, often in a laboratory setting, in order to come up with robust and valid assessment tools that can be used to warn the driver, road users in general, and maintenance personnel of critical conditions. In this paper we compare the field measurements ... 
Finite element application of ERBS extraction
(Journal article; Tidsskriftartikkel; Peer reviewed, 20200424)In this paper we explore ERBS extraction in application to a heat conduction problem.Two types of basis functions are considered: Bspline and exporational Bspline (ERBS)combined with Bernstein polynomials. The first one is a global basis defined on a subdomain whose size is related to the spline degree, while the second one is a strictlylocal basis under the local geometry. While all the coefficients ... 
Finite element method application of ERBS triangles
(Journal article; Tidsskriftartikkel; Peer reviewed, 201911)In this paper we solve an eigenvalue problem on a circular membrane with fixed outer boundary by using a finite element method, where an element is represented as an exporational blending triangle. ERBS triangles combine properties of Bspline finite elements and standard polynomial triangular elements. The overlapping of local triangles allows us to provide a flexible handling of the surface while ... 
The FlexNett Simulator
(Journal article; Peer reviewed, 2019)This paper documents research conducted in the Norwegian FLEXNETT project.<br>It describes a new tool that was developed to study the future impact of prosumers with PV panels on the grid in Norway and the potential energy ﬂexibility that lies with residential prosumers. Systematic use of energy ﬂexibility can be an important instrument for managing peak loads and voltage problems in weak power ... 
Fremtidens fleksible distribusjonsnett : fleksibel nettdrift, forbrukerfleksibilitet, plusskunder og forretningsmodeller
(Research report; Forskningsrapport, 20160215)Denne rapporten er utarbeidet i WP1 og WP2 i prosjektet "Fleksibilitet i fremtidens smarte distribusjonsnett  FlexNett" (20152017). FlexNettprosjektet har som målsetting å bidra til økt fleksibilitet i fremtidens smarte distribusjonsnett gjennom å demonstrere og verifisere tekniske og markedsmessige løsninger for fleksibilitet på ulike nivå i nettet til nytte for ulike aktører. <br> Målsettingen ... 
Geometric Construction of Some Lehmer Means
(Journal article; Tidsskriftartikkel; Peer reviewed, 20181114)The main aim of this paper is to contribute to the recently initiated research concerning geometric constructions of means, where the variables are appearing as line segments. The present study shows that all Lehmer means of two variables for integer power k and for k = m 2 , where m is an integer, can be geometrically constructed, that Lehmer means for power k = 0,1 and 2 can be geometrically ... 
Hardytype inequalities in fractional hdiscrete calculus
(Journal article; Tidsskriftartikkel; Peer reviewed, 20180404)The first power weighted version of Hardy’s inequality can be rewritten as [<i>mathematical formula</i>] where the constant <i>C</i> =[<i>p</i> / <i>p</i>  <i><b>a</b></i>  1]<sup><i>p</i></sup> is sharp. This inequality holds in the reversed direction when<math xmlns="http://www.w3.org/1998/Math/MathML"> <mn>0</mn> <mo>≤<! ≤ ></mo> <mi><i>p</i></mi> <mo><</mo> <mn>1</mn> ... 
Hardytype inequalities over balls in R^N for some bilinear and iterated operators
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019)Some new multidimensional Hardytype inequalites are proved and discussed. The cases with bilinear and iterated operators are considered and some equivalence theorems are proved. 
Homogenization of biased convolution type operators
(Journal article; Tidsskriftartikkel; Peer reviewed, 20191107)This paper deals with homogenization of parabolic problems for integral convolution type operators with a nonsymmetric jump kernel in a periodic elliptic medium. It is shown that the homogenization result holds in moving coordinates. We determine the corresponding effective velocity and prove that the limit operator is a second order parabolic operator with constant coefficients. We also consider ... 
Homogenization of biomechanical models for plant tissues
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017)In this paper homogenization of a mathematical model for plant tissue biomechanics is presented. The microscopic model constitutes a strongly coupled system of reactiondiffusionconvection equations for chemical processes in plant cells, the equations of poroelasticity for elastic deformations of plant cell walls and middle lamella, and Stokes equations for fluid flow inside the cells. The chemical ... 
Homogenization of Levytype operators with oscillating coefficients
(Journal article; Tidsskriftartikkel; Peer reviewed, 20190105)The paper deals with homogenization of Lévytype operators with rapidly oscillating coefficients. We consider cases of periodic and random statistically homogeneous microstructures and show that in the limit we obtain a Lévyoperator. In the periodic case we study both symmetric and nonsymmetric kernels whereas in the random case we only investigate symmetric kernels. We also address a nonlinear ...