Searched for: subject%3A%22plane%255C-wave%22
(1 - 10 of 10)
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Thorbecke, J.W. (author), Almobarak, Mohammed (author), van IJsseldijk, J.E. (author), Brackenhoff, Joeri (author), Meles, Giovanni (author), Wapenaar, C.P.A. (author)
The Marchenko algorithm can suppress the disturbing effects of internal multiples that are present in seismic reflection data. To achieve this, a set of coupled equations with four unknowns is solved. These coupled equations are separated into a set of two equations with two unknowns using a time window. The two unknown focusing functions can...
journal article 2024
document
Hehenberger, Simon P. (author), Caizzone, Stefano (author), Thurner, Stefan (author), Yarovoy, Alexander (author)
Frequency-dependent dielectric properties of 3-D-printed structured dielectrics (dielectric crystals) with engineered effective permittivity for micro-and mmWave applications are studied. Different modeling and measurement techniques for broadband dielectric properties of such 3-D-printed crystals are reviewed, their tradeoffs discussed, and...
journal article 2023
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Gravendeel, Rory (author)
When creating electronic devices, it is essential to model what happens when an electromagnetic field hits the device and it scatters. Conventionally, this can be modelled using the Marching-on-in-Time algorithm. This can become computationally expensive for complex systems. To speed up the algorithm, the Plane-Wave Time-Domain algorithm is...
master thesis 2020
document
Schmits, Jeroen (author)
Dipoles are all around us and the extent to which it is possible to distinguish two dipoles next to each other is a very important criterion for optical resolution. This report proposes that the resolution can be enhanced by placing a substrate with a film underneath the dipoles. This report specifically looks at the effect on the near and far...
bachelor thesis 2020
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Rossi, Stefano (author), Ramalli, Alessandro (author), Fool, F. (author), Tortoli, Piero (author)
Ultrasound vector Doppler techniques for three-dimensional (3-D) blood velocity measurements are currently limited by low temporal resolution and high computational cost. In this paper, an efficient 3-D high-frame-rate vector Doppler method, which estimates the displacements in the frequency domain, is proposed. The novel method extends to 3...
journal article 2020
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Fool, F. (author), Vos, H.J. (author), Shabanimotlagh, M. (author), Soozande, M. (author), Mozaffarzadeh, M. (author), Kim, T. (author), Kang, E. (author), Pertijs, M.A.P. (author), de Jong, N. (author), Verweij, M.D. (author)
To accurately investigate the state of the carotid artery by the local haemodynamics and motion of the plaque using ultrasound, high-frame rate volumetric imaging is necessary. We have specifically designed a matrix array for this purpose. In this proceeding we will focus on imaging a volumetric flow profile using this matrix. For this...
conference paper 2019
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Zhang, Huasheng (author)
In this work, a MATLAB based graphical user interface (GUI) tool is built to analyze Quasi-optical (QO) systems in reception with the Fourier Optics (FO) and Geometrical Optics (GO) methods. Five canonical QO components are discussed, namely parabolic reflectors, elliptical lenses, hemispherical lenses, hyperbolic lenses, and elliptical mirrors....
master thesis 2018
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Ossenkoppele, Boudewine (author)
Ultrasound gives the opportunity to look at muscles and observe their change in length. This tool has increased the knowledge about muscle-tendon dynamics and sometimes revealed surprising muscle stretch behaviour. System identification experiments use robots to disturb the ankle and measure its torque and angle. Muscle movement is derived from...
master thesis 2018
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Kruizinga, P. (author), Mastik, Frits (author), van den Oord, Stijn C.H. (author), Schinkel, Arend F.L. (author), Bosch, Johannes G. (author), de Jong, N. (author), van Soest, G. (author), van der Steen, A.F.W. (author)
The carotid artery (CA) is central to cardiovascular research, because of the clinical relevance of CA plaques as culprits of stroke and the accessibility of the CA for cardiovascular screening. The viscoelastic state of this artery, essential for clinical evaluation, can be assessed by observing arterial deformation in response to the...
journal article 2014
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Michielssen, E. (author), Yilmaz, A. (author), Bagci, H. (author), Jin, J. (author)
The analysis of transient scattering from perfectly conducting as well as potentially inhomogeneous penetrable bodies often is effected using marching on in time based time domain integral equation methods. This paper reviews the state of the art in the field, highlighting recent advances that address not only their stability and computational...
conference paper 2006
Searched for: subject%3A%22plane%255C-wave%22
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