Fakultet for ingeniørvitenskap og teknologi: Recent submissions
Now showing items 181-200 of 1057
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Wavelet neural networks versus wavelet-based naural networks
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023)This is the first paper in a sequence of studies including also [#!llhm2022!#] and [#!llhm2022_1!#] in which we introduce a new type of neural networks (NNs) – wavelet-based neural networks (WBNNs) – and study their properties and potential for applications. We begin this study with a comparison to the currently existing type of wavelet neural networks (WNNs) and show that WBNNs vastly outperform ... -
A General Framework for Measuring and Reporting Sustainability of the Aquaculture Industry
(Chapter; Bokkapittel, 2023-01-26)It has been a paradigm shift for the aquaculture industry in the current parallel era of circular economy, green shift, and Industry 4.0. As one of the world’s largest industries with a long-lasting and significant influence on global prosperity, national economy, food safety, and public health, the importance of sustainability of the aquaculture industry cannot be underestimated. One of the challenges ... -
Properties of sequence of linear functionals on BV with applications
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-11-24)This paper is devoted to investigating the sequence of some linear functionals in the space BV of finite variation functions. We prove that under certain conditions this sequence is bounded. We also prove that this result is sharp. In particular, the obtained results can be used to study convergence of some general Fourier series. Moreover, the obtained conditions seem to be new and useful also for ... -
Sharpness of some Hardy-type inequalities
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-12-04)The current status concerning Hardy-type inequalities with sharp constants is presented and described in a unified convexity way. In particular, it is then natural to replace the Lebesgue measure dx with the Haar measure . There are also derived some new two-sided Hardy-type inequalities for monotone functions, where not only the two constants are sharp but also the involved function spaces are ... -
Performance Analysis of Bidirectional Multi-Hop Vehicle-to-Vehicle Visible Light Communication
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-11-14)Vehicular visible light communication (VVLC) has emerged as a promising field of research, garnering considerable attention from scientists and researchers. VVLC offers a potential solution to enable connectivity and communication between travelling vehicles along the road by using their existing headlights (HLs) and taillights (TLs) as wireless transmitters and integrating photodetectors (PDs) ... -
Enhanced performance of microbial fuel cells using electrochemically treated carbon felt anode
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-11-10)The microbial fuel cell (MFC) technology is emerging as an effective technology for wastewater treatment to remove and detect many pollutants and simultaneously generate power. The anode is an essential component for bacterial attachment and extracellular electron transfer (EET). Thus, anode performance is critical for improving an MFC system's overall performance. Materials that are electronically ... -
Shell-Based Finite Element Modeling of Herøysund Bridge in Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-12-23)This paper thoroughly examines the application of the Finite Element Method (FEM) to the numerical modal analysis of Herøysund Bridge, focusing on the theoretical backdrop, the construction process, and FEM techniques. This work examines the specific applied FEM approaches and their advantages and disadvantages. This Herøysund Bridge analysis employs a two-pronged strategy consisting of a 3D–solid ... -
Homogenization of Non-Autonomous Operators of Convolution Type in Periodic Media<sup>∗</sup>
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-23)The paper deals with periodic homogenization problem for a para\-bo\-lic equation whose elliptic part is a convolution type operator with rapidly oscillating coefficients. It is assumed that the coefficients are rapidly oscillating periodic functions both in spatial and temporal variables and that the scaling is diffusive that is the scaling factor of the temporal variable is equal to the square of ... -
Assessing shielding material Performance: Benchmarking of Monte Carlo codes for oil shale and Basalt-Boron fiber concretes Hando Tohver a,* , Andrius Slavickas b , Maryna Holiuk c , Andrejs Krasn¸ i
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-12-12)Cement-based concretes are commonly used for managing radioactive waste due to their low cost and radiation shielding properties. However, the potential of using oil shale ash as an additive in waste packaging material has been overlooked. This study focuses on benchmarking and developing a Monte Carlo based modeling methodology using multiple transport codes (MCNP, SERPENT, SCALE, OpenMC, and ... -
Well-posedness of heat and wave equations generated by Rubin’s q-difference operator in Sobolev spaces
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023)In this paper, we investigate difference-differential operators of parabolic and hyperbolic types. Namely, we considern on-homogenous heat and wave equations for Rubin’s difference operator. Wellposedness results are obtained in appropriate Sobolev type spaces. In particular, we prove that the heat and wave equations generated by Rubin’s difference operator have unique solutions. We even show that ... -
Line Balancing Problem with Multi-Manned Workstations and Resource Constraints: The Case of Electronics Waste Disassembly
(Journal article; Tidsskriftartikkel, 2023-12-14)The increasing public awareness of environmental protection and the scarcity of rare earth elements have made closed-loop supply chains a necessity in many sectors. In particular, recycling components and parts from end-of-life consumer electronics have drawn the attention of both academics and practitioners. Disassembly line balancing improves the resource efficiency of recycling operations. This ... -
A Qualitative Comparison of ANSYS and OpenFOAM results for Carbon dioxide Plume Transport
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-12-02)This research presents Computational Fluid Dynamics (CFD) simulations in ANSYS® illustrating emissions of to the air. The CFD simulations is employed to study plume transport in urban environment, i.e., Breivika port in the city of Tromsø. The case study presents a two-phase model considering specific wind strength and direction in the city of Tromsø. Geographical coordinates, temperature, and wind ... -
Refinements of Bennett type inequalities
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023)In this paper we discuss, complement and improve some Bennett type inequalities. In particular,we prove a new refinement of a Bennett type inequality using super quadracity argument. -
Some new multidimensional Cochran-Lee and Hardy type inequalities
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023)A multidimensional Cochran-Lee operator is introduced and investigated in the frame of Hardy-type inequalities with parameters 0<p⩽q<∞. Moreover, for the case p=q and power weights even the sharp constant is derived, thus generalizing the original Cochran-Lee inequality to a multidimensional setting. As applications both several known but also new inequalities are pointed out. -
Some new restricted maximal operators of Fejér means of Walsh–Fourier series
(Journal article; Tidsskriftartikkel, 2023-09-12)In this paper, we derive the maximal subspace of natural numbers { <i>n<sub>k</sub></i> : <i>k</i> ≥ 0 }, such that the restricted maximal operator, defined by sup<sub><i>k</i>∈ℕ</sub> | σ<i><sub>n<sub>k</sub></sub>F</i> | on this subspace of Fejér means of Walsh–Fourier series is bounded from the martingale Hardy space <i>H</i><sub>1/2</sub> to the Lebesgue space ... -
Multiphysics: Paving the Future of Engineering
(Conference object; Konferansebidrag, 2023-12)The landscape of engineering is undergoing a transformative evolution, and at its forefront is the paradigm of multiphysics—a revolutionary approach that integrates and simulates multiple physical phenomena within a single computational framework. This abstract explores the significance of multiphysics in shaping the future of engineering and its profound impact on innovation, efficiency, and ... -
Investigating RANS Turbulence Models for Predicting Airflow Dispersion in Enclosed Environments: Numerical Simulation and Experimental Validation
(Conference object; Konferansebidrag, 2023-12)The dispersion of respiratory aerosol particles in enclosed environments poses a significant challenge to understanding the transmission of airborne infectious diseases, mainly due to the influence of turbulence on the propagation of aerosol particles. Turbulence, with its complex and chaotic nature, is a prevailing phenomenon in a fluid flow. Four widely used Reynolds-Averaged Navier-Stokes (RANS) ... -
Multiphysics Study of Thermal Properties of Neoprene and Natural Rubber for Wetsuit Applications
(Conference object; Konferansebidrag, 2023-12)Surfers daring the harshest waves, including the frigid arctic waters of Norway, rely on wetsuits for extended cold-water sessions. Understanding the thermal behavior of wetsuit materials is crucial for enhancing surfers' comfort and safety. In this study, we investigate the thermal properties of neoprene and natural rubber, the primary materials used in wetsuit construction, with a focus on conductive ... -
The International Conference of Multiphysics 2024
(Conference object; Konferansebidrag, 2023-12)The objective of The International Conference of Multiphysics is to share and explore findings on mathematical advances, numerical modelling and experimental validation of theoretical and practical systems in a wide range of applications. The scope of the conference is to address the latest advances in theoretical developments, numerical modelling and industrial application which will promote ... -
The International Journal of Multiphysics (2023)
(Conference object; Konferansebidrag, 2023-12)The International Journal of Multiphysics publishes peer-reviewed original research articles, review papers and communications in the broadly defined field of Multiphysics. The emphasis of this journal is on the theoretical development, numerical modelling and experimental investigations that underpin Multiphysics studies. The scope of the journal is to address the latest advances in theoretical ...