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norskBrowsing Artikler, rapporter og annet (datateknologi og beregningsorienterte ingeniørfag) by Title
Now showing items 8-27 of 160
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Blending functions based on trigonometric and polynomial approximations of the Fabius function
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019)Most simple blending functions are polynomials, while more advanced blending functions are, for example, rational or expo-rational fractions. The Fabius function has the required properties of a blending function, but is a nowhere analytic function and cannot be calculated exactly everywhere on the required domain. We present a new set of trigonometric and polynomial blending functions with the shape ... -
Blending spline surfaces over polygon mesh and their application to isogeometric analysis
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-11)Finite elements are allowed to be of a shape suitable for the specific problem. This choice defines thereafter the accuracy of the approximated solution. Moreover, flexible element shapes allow for the construction of an arbitrary domain topology. Polygon meshes are a common representation of the domain that cover any choice of the finite element shape. Being an alternative tool for modeling and ... -
Blending techniques in Curve and Surface constructions
(Book; Bok, 2022) -
Blendingsteknikker i kurve- og flatekonstruksjoner
(Book; Bok, 2022) -
Boundedness and compactness of a class of Hardy type operators
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-12-13)We establish characterizations of both boundedness and of compactness of a general class of fractional integral operators involving the Riemann-Liouville, Hadamard, and Erdelyi-Kober operators. In particular, these results imply new results in the theory of Hardy type inequalities. As applications both new and well-known results are pointed out. -
Bruk av droner i nordområdene
(Research report; Forskningsrapport, 2020-05-13)Formålet med denne rapporten er å vise eksempler på bruk av fjernstyrte og autonome droner i petroleumssektoren og vise hvilke utviklingstrender innen droneteknologi som er viktige. Utfordringer og muligheter for bruk av droner i nordområdene er spesielt vektlagt. Teknologi for og anvendelser av flyvende droner, droner på havoverflaten og droner under vann er behandlet i denne rapporten. Rapporten ... -
Continuous refinements of some Jensen-type inequalities via strong convexity with applications
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-23)In this paper we prove new continuous refinements of some Jensen type inequalities in both direct and reversed forms. As applications we also derive some continuous refinements of Hermite–Hadamard, Hölder, and Popoviciu type inequalities. As particular cases we point out the corresponding results for sums and integrals showing that our results contain both several well-known but also some new ... -
Deployment of a Neo-Hookean membrane: experimental and numerical analysis
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013-03-31)The aim of this research is to assess the response of a thin membrane subjected to high-pressure gas loading for inflation. This procedure is applied during the design process of the membrane structure to allow the product to resist high-pressure loading and to further characterize the hyper-elastic material. The simulation in this work considers the standard procedures used in the LS-DYNA software, ... -
Design of water shock tube for testing shell materials
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014-04-15)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. ... -
Discretization and Representation of a Complex Environment for On-Policy Reinforcement Learning for Obstacle Avoidance for Simulated Autonomous Mobile Agents
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-12)In recent years, the demand for digitalization, automation, and smart systems in the airline industry has accelerated. Furthermore, due to the ongoing global pandemic as of 2022, airlines are faced with the challenge of offering flexibility in both cargo and passenger capacity. Studies show that the use of smart products and autonomous agents are expected to play a key part in the digital transformation ... -
Dynamic plastic response of beams subjected to localised pulse loads
(Journal article; Peer reviewed, 2018-10-31)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 close-in pulse pressure loading. The close-in pressure load is characterised by a spatially varying function constant over a central region and exponentially ... -
E-Mobility and Batteries—A Business Case for Flexibility in the Arctic Region
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-28)This paper provides a method for determining the economic incentives and limitations for a battery used for peak clipping, with the goal of finding an optimal mix between the battery’s power density and energy density. A ratio called the R-factor has been introduced, which helps determine the energy demand to curb the peak. The paper’s results embrace different investment scenarios showing what ... -
Economic evaluation of the Power grid tariff for households With solar Power installed
(Journal article; Peer reviewed; Tidsskriftartikkel, 2017)This paper focuses on alternative grid tariffs for household customers with roof top PV-panels ("prosumers"), and evaluates how alternative grid tariffs might affect the benefit from investing in a roof top PV-panel. The paper further shows how different orientations of the PV-panels 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, 2019-12-19)We study embeddings of weighted local and consequently global generalized Morrey spaces defined on a quasi-metric 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 non-separable Morrey space into a separable space. In the general setting of quasi-metric measure ... -
Equivalent integral conditions related to bilinear Hardy-type inequalities
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019)Infinitely many, even scales of, equivalent conditions are derived to characterize the bilinear Hardy-type 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) -
Existence and Uniqueness of Some Cauchy Type Problems in Fractional q-Difference Calculus
(Journal article; Tidsskriftartikkel, 2020)In this paper we derive a sufficient condition for the existence of a unique solution of a Cauchy type q-fractional problem (involving the fractional q-derivative of Riemann-Liouville type) for some nonlinear differential equations. The key technique is to first prove that this Cauchy type q-fractional problem is equivalent to a corresponding Volterra q-integral equation. Moreover, we define the ... -
Experiments on turbulence from colliding ice floes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-16)Increased knowledge about energy dissipation processes around colliding ice floes is important for improved understanding of atmosphere-ice-ocean energy transfer, wave propagation through sea ice, and the polar climates. The aim of this study is to obtain such information by investigating colliding ice floe dynamics in a large-scale experiment and directly measuring and quantifying the turbulent ... -
Exploring benefits of using blending splines as transition curves
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-19)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
(Conference object; Konferansebidrag, 2019-11)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 ...
