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Ghose, R. (author), Carvalho, João (author), Alves, Daniela V. (author), Santos, Luiz Alberto (author), Ressurreição, Ricardo (author), Alves, Paulo Henrique Bastos (author), Leote, Jaime (author)The Azambuja fault is a NNE trending structure located 50 km north of Lisbon, the capital and most populous city of Portugal. The fault has been considered as a possible source for the historical, large earthquakes. Understanding this fault is a priority in seismic hazard evaluation of this region. The fault has a clear morphological...journal article 2023
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Oderwald Blázquez, Adrian (author)For certain geotechnical structures, such as dikes and levees, the design quality is heavily reliant on the sampling quality. In addition, the extent of consequences on geotechnical design of using parameters from samples with a certain degree of disturbance in laboratory tests is unclear. While the available literature has been mainly focussed...master thesis 2022
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Tan, Xin (author)Many functional imaging modalities such as EEG, fMRI, and fUS were developed, and have the potential to achieve the brain-computer interface. In addition to those conventional functional imaging modalities which measure the electrical signal or neurovascular coupling induced by brain activity, Patz et al. found evidence for the existence of a...master thesis 2022
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Hosseini, Fatemeh (author), Mozaffarzadeh, M. (author), Mahlooiifar, Ali (author), Verweij, M.D. (author), de Jong, N. (author)In recent years, transcranial photoacoustic (TPA) imaging has become a popular modality for diagnosis of brain disorders. However, due to the presence of skull, TPA images are strongly degraded. Acoustically, this degradation is mainly categorized into the phase aberration, mode-converted shear waves, and multiple scattering. Previous studies...conference paper 2022
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Mastromarino, S. (author), Rook, R. (author), de Haas, D.W. (author), Verschuur, D.J. (author), Rohde, M. (author), Kloosterman, J.L. (author)A method based on ultrasonic wave propagation is applied for the determination of the viscosity of low viscous liquids. A waveguide is used to remotely transmit the ultrasonic waves from a shear piezoelectric transducer into the liquid. At the solid-liquid interface, a guided wave mode, the shear mode, is used to extract the liquid viscosity....journal article 2021
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Meijs, Ludo (author)This thesis aims to evaluate the effect of signal processing techniques related to ultrasonic laboratory measurements of shear waves. Compressional and shear wave velocities play an important role in static elastic rock deformation behaviour estimation. Onsets of compressional and shear wave signal have to be determined in order to calculate the...master thesis 2019
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Buisman, Menno (author)In this research, a new measuring method to detect shear parameters in fluid mud is proposed, namely using shear waves, or S-waves opposed to the conventional pressure waves, or P-waves. Currently, detecting fluid mud is done by the use of P-waves. This paper shows that conventional P-waves velocity measurements are unsuitable for linking...master thesis 2019
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Keijzer, L.B.H. (author), Strachinaru, Mihai (author), Bowen, Dan J. (author), Geleijnse, Marcel L. (author), van der Steen, A.F.W. (author), Bosch, Johan G. (author), de Jong, N. (author), Vos, H.J. (author)For the quantification of myocardial function, myocardial stiffness can potentially be measured non-invasively using shear wave elastography. Clinical diagnosis requires high precision. In 10 healthy volunteers, we studied the reproducibility of the measurement of propagation speeds of shear waves induced by aortic and mitral valve closure ...journal article 2019
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Hogenhout, Gerard (author)Worldwide, cardiovascular diseases (e.g. coronary heart disease and stroke) are the leading cause of death. Early detection of cardiac failure symptoms and effective treatment can help reducing health care costs and predict cardiovascular events, which may prevent loss of quality of life, or even loss of life. This early recognition of imminent...master thesis 2018
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Jolink, Chris (author)When modelling a structure-soil system, interaction stresses at the interface of the structure and the surface of soil layer influence the dynamic behaviour of the system. These interaction stresses are not accounted for in many simplified models that evaluate the behaviour of the soil layer and the structure separately. Modelling a fully...student report 2017
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Strachinaru, Mihai (author), Bosch, Johan G. (author), van Dalen, Bas M. (author), van Gils, Lennart (author), van der Steen, A.F.W. (author), de Jong, N. (author), Geleijnse, Marcel L. (author), Vos, H.J. (author)The propagation velocity of shear waves relates to tissue stiffness. We prove that a regular clinical cardiac ultrasound system can determine shear wave velocity with a conventional unmodified tissue Doppler imaging (TDI) application. The investigation was performed on five tissue phantoms with different stiffness using a research platform...journal article 2017
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Vos, H.J. (author), van Dalen, Bas M. (author), Heinonen, Ilkka (author), Bosch, Johan G. (author), Sorop, Oana (author), Duncker, Dirk J. (author), van der Steen, A.F.W. (author), de Jong, N. (author)Cardiac muscle stiffness can potentially be estimated non-invasively with shear wave elastography. Shear waves are present on the septal wall after mitral and aortic valve closure, thus providing an opportunity to assess stiffness in early systole and early diastole. We report on the shear wave recordings of 22 minipigs with high-frame-rate...journal article 2017
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Kruiver, Pauline P. (author), van Dedem, Ewoud (author), Romijn, Remco (author), de Lange, Ger (author), Korff, M. (author), Stafleu, Jan (author), Gunnink, Jan L. (author), Rodriguez-Marek, Adrian (author), Bommer, Julian J. (author), van Elk, Jan (author), Doornhof, Dirk (author)A regional shear-wave velocity (V<sub>S</sub>) model has been developed for the Groningen gas field in the Netherlands as the basis for seismic microzonation of an area of more than 1000 km<sup>2</sup>. The V<sub>S</sub> model, extending to a depth of almost 1 km, is an essential input to the modelling of hazard and risk due to induced...journal article 2017
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Carvalho, João (author), Ghose, R. (author), Alves, D. (author), Leote, J (author)Expressions of ductile, soft-sediment deformations induced by ground movements due to past earthquakes are difficult to recognize in near-surface soils. We have carried out shallow S-wave reflection studies in a seismically active area located northeast of metropolitan Lisbon, Portugal. Identifying shallow disturbed zones and hidden fault...journal article 2016
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Divya Priya, B. (author), Dodagoudar, G.R. (author)Mapping surficial and subsurface conditions play an important role in analysis and design of geotechnical structures and facilities. Spatial distribution of depth to soil-bedrock interface has a prime significance in developing input ground motion at the surface and estimating damage potential of an earthquake. This paper deals with the...conference paper 2015
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Konstantaki, L.A. (author), Ghose, R. (author), Draganov, D.S. (author), Diaferia, G. (author), Heimovaara, T.J. (author)Understanding the processes occurring inside a landfill is important for improving the treatment of landfills. Irrigation and recirculation of leachate are widely used in landfill treatments. Increasing the efficiency of such treatments requires a detailed understanding of the flow inside the landfill. The flow depends largely on the...journal article 2014
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Frank, J.G. (author), Ruigrok, E.N. (author), Wapenaar, C.P.A. (author)Seismic interferometry allows for the creation of new seismic traces by cross correlating existing ones. With sufficient sampling of remote-source positions, it is possible to create a virtual source record by transforming a receiver location into a virtual source. The imaging technique developed here directly retrieves reflectivity information...journal article 2014
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Konstantaki, L.A. (author), Dragnov, D.S. (author), Heimovaara, T.J. (author), Ghose, R. (author)A significant problem with landfills is their aftercare period. A landfill is considered to be safe for the environment only after a relatively long period of time. Until it reaches such a condition, it has to be periodically treated. Not only are treatments very expensive, but they could be dangerous as well; for example, when barriers limiting...journal article 2013
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Frank, J.G. (author)Green's function retrieval by seismic interferometry (SI) exists in a variety of forms. Many of the applications of SI allow the creation of new seismic traces by crosscorrelating a wavefield recorded at two separate locations. The sum of this operation over multiple sources results in the creation of a new signal such that one of the recording...master thesis 2013
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Drijkoningen, G.G. (author), El Allouche, N. (author), Thorbecke, J.W. (author), Bada, G. (author)Under certain circumstances, marine streamer data contain nongeometrical shear body wave arrivals that can be used for imaging. These shear waves are generated via an evanescent compressional wave in the water and convert to propagating shear waves at the water bottom. They are called “nongeometrical” because the evanescent part in the water...journal article 2012
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