Fakultet for ingeniørvitenskap og teknologi: Nye registreringer
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Comparison of “Zero Emission” Vehicles with Petrol and Hybrid Cars in Terms of Total CO2 Release—A Case Study for Romania, Poland, Norway and Germany
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-10-27)The authors compare the energy consumption and CO<sub>2</sub> emissions from vehicles using internal combustion engines (ICE), battery electric vehicles (BEV), fuel cell electric vehicles (FCEV), and two types of hybrid vehicles, BEV‐ICE hybrid and BEV‐FCEV hybrid. This paper considers several scenarios for four countries’ electricity production from primary energy sources to estimate total ... -
A Field Programmable and Dynamic Configurable Power Electronic Converter Concept
(Chapter; Bokkapittel, 2022)This paper proposes the concept of a field programmable and configurable power electronic converter together with a new synthesis method. By considering the converter as a pack of resources, the converter topology and configuration of inputs and outputs can be programmed in the field through, utilising the available device resources. -
Weighted Hardy Operators in Complementary Morrey Spaces
(Journal article; Tidsskriftartikkel; Peer reviewed, 2012-11-11)We study the weighted -boundedness of the multidimensional weighted Hardy-type operators and with radial type weight , in the generalized complementary Morrey spaces defined by an almost increasing function . We prove a theorem which provides conditions, in terms of some integral inequalities imposed on and , for such a boundedness. These conditions are sufficient in the general case, but we ... -
Cascade-Based Controlled Attitude Synchronization and Tracking of Spacecraft in Leader-Follower Formation
(Journal article; Tidsskriftartikkel; Peer reviewed, 2011-05-05)We propose controllers for leader-follower attitude synchronization of spacecraft formations in the presence of disturbances, that is, the leader spacecraft is controlled to follow a given reference, while a follower spacecraft is controlled to synchronize its motion with the leader’s. In the ideal disturbance-free scenario, we show that synchronization takes place asymptotically. Moreover, we ... -
Conformal Transformation Analysis of Capacitive Wireless Charging
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-30)This paper studies the capacitive coupling in a capacitive power transfer (CPT) system designed for charging applications. It proposes mathematical models using the conformal transformation for calculating air-gapped and underwater capacitance and verifies the proposed models using COMSOL multiphysics and measurements. The measured results show that we can achieve nano-farad capacitance ranges ... -
Multiphysics Perspective of Microspray
(Conference object; Konferansebidrag, 2022-09-22) -
Finite Element Analysis to determine the impact of Infill density on Mechanical Properties of 3D Printed Materials
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-29)Additive manufacturing (AM) is the process in which objects are created through the layer-by-layer deposition of material that is controlled by a computer. The infill is the internal structure of the 3D printed model. It determines the strength, weight, cost, time, and overall quality of the part. Ranging from simple lines to more complex geometric shapes, infill patterns can affect a part's ... -
Some new iterated Hardy-type inequalities: the case theta=1
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013-11-08)In this paper we characterize the validity of the Hardy-type inequality ∥ ∥ ∫ <sub>s</sub>∞) h(z)dz ∥ p,u,(0,t) ∥ q,w,(=,∞≤ c∥h∥ 1,v(0,∞) where 0 < p < ∞,0< q ≤ +∞, u, w and v are weight functions on (0,∞). It is pointed out that this characterization can be used to obtain new characterizations for the boundedness between weighted Lebesgue spaces ... -
Homogenization of a singular random one-dimensional PDE with time-varying coefficients
(Journal article; Tidsskriftartikkel; Peer reviewed, 2012-05-04)In this paper we study the homogenization of a nonautonomous parabolic equation with a large random rapidly oscillating potential in the case of one-dimensional spatial variable. We show that if the potential is a statistically homogeneous rapidly oscillating function of both temporal and spatial variables, then, under proper mixing assumptions, the limit equation is deterministic, and convergence ... -
Modelling An Improved Ship Appointment System for Lockage Operations of Waterway Transport
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-10)The traffic congestion problem has become a significant challenge for green shipping of inland waterway transport, resulting in long waiting times and high carbon emissions. Several studies have been conducted to optimize the use of the passing facilities and lockage efficiency, but the improvement of the ship appointment system has not been investigated. In this paper, we formulate new mathematical ... -
A Decision-Support Framework for Smart and Sustainable Reverse Logistics Network Design
(Doctoral thesis; Doktorgradsavhandling, 2022-10-06)The Fourth Industrial Revolution, namely Industry 4.0, has provided opportunities for digitalization and paradigm shifts in many industries and business sectors. Reverse logistics is currently being increasingly focused on by worldwide companies and governments due to the pressure on sustainable development and circular economy. Through the gradual but steady adoption of several disruptive ... -
Addressing Uncertainty by Designing an Intelligent Fuzzy System to Help Decision Support Systems for Winter Road Maintenance
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-17)One of the main challenges in developing efficient and effective winter road maintenance is to design an accurate prediction model for the road surface friction coefficient. A reliable and accurate prediction model of road surface friction coefficient can help decision support systems to significantly increase traffic safety, while saving time and cost. High dynamicity in weather and road surface ... -
Roach Infestation Optimization MPPT Algorithm for Solar Photovoltaic System
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-16)Solar photovoltaic (PV) power has several advantages such as free availability, absence of rotating parts, can be easily integrated with building architecture, and need little maintenance. However, the PV cell current–voltage (I–V) characteristics are non-linear and power generated from a PV array depends on solar insolation/irradiation and panel temperature. The extracted PV output power is ... -
Measuring Cold Exposure
(Conference object; Konferansebidrag, 2022-08-22) -
Isogeometric analysis using a tensor product blending spline construction
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-01)In this paper, we introduce a blending spline type construction into the isogeometric analysis. We consider a general algorithm for solving a number of boundary value problems, including heat equation, wave equation, linear elasticity, etc. The usage of blending spline construction in the isogeometric context mixes standard finite element and NURBS-based approaches while accumulating the benefits ... -
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 ... -
Cost-related analysis of implementing energy-efficient retrofit measures in the residential building sector of a middle-income country – A case study of Bosnia and Herzegovina
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-12-15)This study presents an in-depth analysis of the cost structure when planning EE retrofit measures in the residential sector in Bosnia and Herzegovina. The analysis showed that implementing EE retrofit measures would result in substantial energy savings in single-family houses, however, the specific cost of implementing EE retrofit measures per resident for single-family houses is on average 2.8 ... -
A Two-Stage Decision-Support Approach for Improving Sustainable Last-Mile Cold Chain Logistics Operations of COVID-19 Vaccines
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-21)The COVID-19 pandemic has become a global health and humanitarian crisis that catastrophically affects many industries. To control the disease spread and restore normal lives, mass vaccination is considered the most effective way. However, the sustainable last-mile cold chain logistics operations of COVID-19 vaccines is a complex short-term planning problem that faces many practical challenges, ... -
Computationally efficient approximate dynamic programming for multi-site production capacity planning with uncertain demands
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-05)With globalization and rapid technological-economic development accelerating the market dynamics, consumers' demand is becoming more volatile and diverse. In this situation, capacity adjustment as an operational strategic decision plays a major role to ensure supply chain responsiveness while maintaining costs at a reasonable norm. This study contributes to the literature by developing computationally ... -
Review on material and design of anode for microbial fuel cell
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-21)Microbial Fuel Cell (MFC) is a bio-electrochemical system that generates electricity by anaerobic oxidation of substrates. An anode is the most critical component because the primary conversion of wastewater into electrons and protons takes place on the surface of the anode, where a biofilm is formed. This paper describes the essential properties of the anode and classifies its types according ...