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Sarker, D. (author), Schinkel, C.V. (author), Portela, L. (author)This study reports the effect of N<sub>2</sub> and CO<sub>2</sub> bubbles on dilute to dense gas-liquid two-phase bubbly flow. A shadowgraph imaging technique captured bubble images at a high spatiotemporal resolution. The recordings of bubble images allow us to compute gas fraction distribution. It requires challenging segmentation and gas...journal article 2023
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Hunter, William (author)Atrial fibrillation is a common cardiovascular disease, affecting the regular beating of the heart through chaotic contraction of the heart's upper chambers. On its own, the condition—increasingly prevalent among the elderly—is not life threatening, but it leads to an increased risk of stroke and heart failure. As of yet, there is no consensus...master thesis 2022
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Spasov, Mihail (author)Image registration is the process that overlays two or more images from different sources taken at different times and angles. Art conservators take various scans of paintings and then register them against the original in order to learn more about the working style of the artist, materials used and physical changes throughout time. This paper...bachelor thesis 2022
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Smets, P.S.M. (author), Weemstra, C. (author), Evers, L.G. (author)We report on the extraction of deep ocean travel time variations from time-lapse cross-correlations between a hydrophone station and a three-component broadband seismometer. The signals we cross-correlate in this study result from repeated activity by the Monowai seamount, one of the most active submarine volcanoes of the Tonga-Kermadec ridge...journal article 2022
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le Poole, J.J. (author), Duchateau, E.A.E. (author), van Oers, B.J. (author), Hopman, J.J. (author), Kana, A.A. (author)Generating detailed warship layouts is crucial to check technical feasibility and performance consistent with emergent requirement elucidation during early stage design. However, generating feasible detailed layouts is a complex and time consuming task. Even today, detailed layout plans are often manually drawn using CAD software, taking up...journal article 2022
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Comparison of Thermospheric Winds Measured by GOCE and Ground-Based FPIs at Low and Middle LatitudesJiang, Guoying (author), Xiong, Chao (author), Stolle, Claudia (author), Xu, Jiyao (author), Yuan, Wei (author), Makela, Jonathan J. (author), Harding, Brian J. (author), Kerr, Robert B. (author), March, G. (author), Siemes, C. (author)The re-estimates of thermospheric winds from the Gravity field and steady-state Ocean Circulation Explorer (GOCE) accelerometer measurements were released in April 2019. In this study, we compared the new-released GOCE crosswind (cross-track wind) data with the horizontal winds measured by four Fabry-Perot interferometers (FPIs) located at...journal article 2021
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Naranjo Hernandez, David (author)In 2017 the National Power Company in Iceland, Landsvirkjun, started the operation of a geother- mal power plant in Theistareykir (Northeastern Iceland). The plant’s operation requires extraction, circulation, and injection of the geothermal fluids to produce energy. These processes depend on the existing fracture network of the reservoir....master thesis 2020
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Kumar, Karishma (author)Detailed imaging of blood flow may improve the understanding of brain functions. The state-of-the-art non-invasive flow imaging of the brain is limited to a one-dimensional Doppler setting. We propose a method to estimate the two-dimensional flow vector in the fine vascular network of the brain by using a speckle tracking technique. The...master thesis 2020
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Tronchin, Lamberto (author), Merli, Francesca (author), Manfren, Massimiliano (author), Nastasi, B. (author)During the renovation of auditoria and concert halls, the acoustic quality is normally evaluated from measurements of impulse responses. One possibility for evaluating the acoustic quality from the measurements (the simulations) consists of convolving anechoic music with the measured (or simulated) impulse responses. In this way, a psycho...journal article 2020
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van Willigen, D.M. (author), Neer, Paul L.M.J. van (author), Massaad Mouawad, J.M. (author), de Jong, N. (author), Verweij, M.D. (author), Pertijs, M.A.P. (author)Transit-time ultrasonic flow meters are widely used in industry to measure fluid flow. In practice ultrasonic flow meters either show a zero-flow error or suffer from a significant random error due to a limited signal-to-noise ratio, requiring a significant amount of averaging to achieve good precision. This work presents a method that minimizes...journal article 2020
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Kölling, Bart (author)A common cardiac arrhythmia is atrial fibrillation, which is becoming more widespread worldwide. Currently there is some understanding about the mechanisms behind atrial fibrillation, however more insight into the conduction of the atrial tissue is desired. Therefore, invasive mapping studies have been performed where an array of electrodes is...master thesis 2019
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Scharnowski, S. (author), Sciacchitano, A. (author), Kahler, Christian J. (author)For the reliable estimation of velocity vector fields by means of particle image velocimetry (PIV), the cross-correlation functions calculated from the signal within each interrogation window must feature a distinct peak that represents the average shift of the particle image ensemble. A high valid detection probability (VDP) of the correct...journal article 2019
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Nishitsuji, Y. (author), Marín, Luis Franco (author), Gomez, Martín (author), Rowe, C.A (author), Draganov, D.S. (author)No conclusive evidence has been presented to date for tectonic tremor (TT) in the vicinity of central Chile, where the Nazca Plate is subducting beneath the South American Plate. Subduction in our experimental location (roughly 35.5° S, 70.5° W) is steep and fairly unobstructed compared to the flattened and more seismogenic behavior to the north...journal article 2019
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Scharnowski, Sven (author), Sciacchitano, A. (author), Kähler, Christian J. (author)For the reliable estimation of velocity vector field s by means of 2D and 3D particle image velocimetry (PIV), the cross-correlation functions calculated from the signal within each interrogation window must feature a distinct peak that represents the average shift of the particle image ensemble. A high valid detection probability (VDP) of the...conference paper 2018
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Sun, S. (author), Kooij, B.J. (author), Yarovoy, Alexander (author)Cross-correlated contrast source inversion (CC-CSI) is a nonlinear iterative inversion method that is proposed recently for solving the inverse scattering problems. In CC-CSI, a cross-correlated error is constructed and introduced to the cost functional, which improves the inversion ability when compared to the classical design of the cost...journal article 2018
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Boullenger, B. (author)The theory of seismic interferometry predicts that the cross-correlation (and possibly summation) between seismic recordings at two separate receivers allows the retrieval of an estimate of the inter-receiver response, or Green's function, from a virtual source at one of the receiver positions. Ideally, the recordings must consist of the...doctoral thesis 2017
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Feld, R. (author)Ground-penetrating radar (GPR) is a non-destructive method that images the subsurface using radar. A transmitter generates a radar pulse. This signal propagates into the ground where it reflects against subsurface heterogeneities, and travels back to the surface. A receiver records the reflected signal. The reflected signal contains information...doctoral thesis 2017
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Sun, S. (author), Kooij, B.J. (author), Jin, T. (author), Yarovoy, Alexander (author)In this paper, we improved the performance of the contrast source inversion (CSI) method by incorporating a so-called cross-correlated cost functional, which interrelates the state error and the data error in the measurement domain. The proposed method is referred to as the cross-correlated CSI. It enables better robustness and higher inversion...journal article 2017
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Ruigrok, E.N. (author), Gibbons, Steven (author), Wapenaar, C.P.A. (author)An areal distribution of sensors can be used for estimating the direction of incoming waves through beamforming. Beamforming may be implemented as a phase-shifting and stacking of data recorded on the different sensors (i.e., conventional beamforming). Alternatively, beamforming can be applied to cross-correlations between the waveforms on...journal article 2017
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Radeljic-Jakic, N. (author)Distance measurement using ultrasonic waves is employed in a wide range of industrial applications. In this thesis our main goal is to investigate the possibility of processing ultrasonic signals with a ??-modulator and to process its bitstream output signal with the cross-correlation technique, while being independent of the transducer that is...master thesis 2015
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