Searched for: subject%3A%22Fast%255C%2BFourier%255C%2BTransform%22
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Hajizad, O. (author), Kumar, A. (author), Petrov, R.H. (author), Sietsma, J. (author), Dollevoet, R.P.B.J. (author), Li, Z. (author)
Microscopic stress and strain partitioning control the mechanical and damage behavior of multiphase steels. Using a combined numerical and experimental approach, local strain distributions and deformation localization are characterized in a carbide free bainitic steel produced by continuous cooling. The microstructure of the steel consists of...
journal article 2022
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Grazian, F. (author), Shi, W. (author), Soeiro, Thiago B. (author), Dong, J. (author), Bauer, P. (author)
When considering EV wireless charging that uses inductive power transfer with magnetic resonance, the coils’ current distortion must be minimized to guarantee compliance with the electromagnetic compatibility limits on the radiated magnetic field set by the relevant industrial standards. This paper analyzes the current distortion caused by...
conference paper 2022
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Prundeanu, Alin (author)
Wheat is among the most important grains worldwide. For the assessment of wheat fields, image detection of spikes atop the plant containing grain is used. Previous work in deep learning for precision agriculture employs the already established object detectors, Faster R-CNN and YOLO, adapted for the given context. However, these models suffer...
bachelor thesis 2021
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Hajizad, O. (author)
In this PhD thesis, we investigated possible steel candidates for use in railway crossings in order to reduce the damage in them. Pearlitic R350HT together with Bainitic grades including CrB, B1400 and carbide free B360 were investigated for their mechanical properties such as ultimate strength, yield strength, ductility and hardness. The...
doctoral thesis 2021
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Macarulla Rodriguez, M. (author)
Low-field Magnetic Resonance Imaging (LF MRI) is a cheap and safe technique to visualise the internal structure of the human body. Unlike other imaging techniques, Magnetic Resonance Imaging does not use ionising radiation to generate the images. Instead, it uses magnetic fields and radio waves which are nonthreatening to the health. The LF MRI...
master thesis 2020
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Liang, Jianbin (author), Jiang, James W. (author), Callegaro, Alan Dorneles (author), Bilgin, Berker (author), Dong, J. (author), Reeves, Debbie (author), Emadi, Ali (author)
This study presents a numerical modelling approach for the prediction of vibration and acoustic noise for a 24/16 traction switched reluctance machine (SRM). The numerical modelling includes the simulation of electromagnetic force in JMAG, the calculation of natural frequencies and the simulation of vibration and acoustic noise in ACTRAN....
journal article 2020
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Yang, Ruiyun (author), Qiao, Tiezhu (author), Pang, Y. (author), Yang, Yi (author), Zhang, Haitao (author), Yan, Gaowei (author)
A novel approach based on infrared spectrum analysis for early-warning of longitudinal tearing of the conveyor belt was proposed in the paper. Unlike most existing methods, the proposed method monitors the change process of the infrared radiation field of the longitudinal tearing through the infrared thermal imaging technology, and judges...
journal article 2020
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Wang, J. (author), Aubry, P.J. (author), Yarovoy, Alexander (author)
3-D imaging with irregular planar multiple-input-multiple-output (MIMO) arrays is discussed. Due to signal acquisition on irregular spatial sampling grids by using these antenna arrays, the fast Fourier transform (FFT)-based imaging algorithms cannot readily be used for image formation. To avoid the application of computationally intensive...
journal article 2020
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Max, Gyula (author)
A well-established method for finding the optimal control policy for a given dynamical system is to solve the problem iteratively going from its terminal state "backwards" in time, known as Dynamic Programming Algorithm. For a generic problem with discrete state/action space, the algorithm has computational complexity of <i>O(NM)</i> for <i>N</i...
master thesis 2019
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Wang, J. (author), Yarovoy, Alexander (author)
In this paper, a Nonuniform fast Fourier transform (NUFFT)-based range migration algorithm (RMA) is proposed for three-dimensional (3-D) imaging with irregular planar arrays. The proposed imaging algorithm takes advantage of NUFFT to reconstruct the signal spectra in the wavenumber domain, which overcomes the constraint of irregular spatial...
conference paper 2019
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Kroes, Jenske (author)
Subsea Rock Installation vessels cover pipelines, which transport oil from oil and gas fields. This is done by means of a flexible fallpipe until depths of 1000 meters. Around the Shetland Islands, the workability of the vessels at two specific project locations is compromised by the conditions in the ocean. In this research, data from a 3D...
master thesis 2018
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Wang, J. (author), Aubry, P.J. (author), Yarovoy, Alexander (author)
Ground penetrating radar imaging from the data acquired with arbitrarily oriented dipole-like antennas is considered. To take into account variations of antenna orientations resulting in spatial rotation of antenna radiation patterns and polarizations of transmitted fields, the full-wave method that accounts for the near-, intermediate-, and...
journal article 2018
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Ishwardat, N.K.S. (author)
During this thesis research an attempt is made to introduce a computational lightweight horizontal wind retrieval method applied on scanning Doppler radar velocity data. Horizontal wind parameters are the wind speed and wind direction. If know they are known in a vertical extend, they form a wind profile. In a typical approach, horizontal wind...
master thesis 2017
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Hazenoot, D. (author)
Numerical integration methods such as the Fourier-based COS method can be used for effciently and accurately pricing financial products. The COS method can be applied to options on one underlying stock as well as on multiple underlying stocks. However, this method suffers from an exponential increase in computational complexity as the dimensions...
master thesis 2016
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Zhao, J. (author), Vollebregt, E.A.H. (author), Oosterlee, C.W. (author)
This paper presents a fast numerical solver for a nonlinear constrained optimization problem, arising from a 3D frictional contact problem. It incorporates an active set strategy with a nonlinear conjugate gradient method. One novelty is to consider the tractions of each slip element in a polar coordinate system, and use azimuth angles as...
report 2014
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Karunanithi, V. (author)
Navigation systems using pulsar signals have been of great interest ever since the discovery of pulsars in 1967 and various studies were carried out ever since to determine the feasibility of such systems. The successful working of a navigation system using pulsar would mean that spacecraft can maneuver through the deep space with very little...
master thesis 2012
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Bongers, WA. (author), Van Beveren, V. (author), Thoen, D.J. (author), Nuij, P.J.W.M. (author), De Baar, M.R. (author), Donné, A.J.H. (author), Westerhof, E. (author), Goede, A.P.H. (author), Krijger, B. (author), Van den Berg, M.A. (author), Kantor, M. (author), Graswinckel, M.F. (author), Hennen, B.A. (author), Schüller, F.C. (author)
An intermediate frequency (IF) band digitizing radiometer system in the 100–200 GHz frequency range has been developed for Tokamak diagnostics and control, and other fields of research which require a high flexibility in frequency resolution combined with a large bandwidth and the retrieval of the full wave information of the mm-wave signals...
journal article 2011
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Voortman, L.M. (author), Stallinga, S. (author), Schoenmakers, R.H.M. (author), Van Vliet, L.J. (author), Rieger, B. (author)
Today, the resolution in phase-contrast cryo-electron tomography is for a significant part limited by the contrast transfer function (CTF) of the microscope. The CTF is a function of defocus and thus varies spatially as a result of the tilting of the specimen and the finite specimen thickness. Models that include spatial dependencies have not...
journal article 2011
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Verweij, M.D. (author), Huijssen, J. (author)
The full-wave computation of transient acoustic fields with sizes in the order of 100x100x100 wavelengths by 100 periods requires a numerical method that is extremely efficient in terms of storage and computation. Iterative integral equation methods offer a good performance on these points, provided that the recurring spatiotemporal convolutions...
journal article 2009
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Chao, G. (author), Smeulders, D.M.J. (author), Van Dongen, M.E.H. (author)
Acoustic experiments on the propagation of guided waves along water-filled boreholes in water-saturated porous materials are reported. The experiments were conducted using a shock tube technique. An acoustic funnel structure was placed inside the tube just above the sample in order to enhance the excitation of the surface modes. A fast Fourier...
journal article 2006
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