- document
-
Dia, Amadou Sall (author), Renaud, G.G.J. (author), Nooghabi, Aida Hejazi (author), Grimal, Quentin (author)Decreased thickness of the bone cortex due to bone loss in the course of ageing and osteoporosis is associated with reduced bone strength. Cortical thickness measurement from ultrasound images was recently demonstrated in young adults. This requires the identification of both the outer (periosteum) and inner (endosteum) surfaces of the bone...journal article 2023
- document
-
Zhao, Wenzhao (author), Fan, Yuling (author), Wang, Hongjian (author), Gemmeke, Hartmut (author), van Dongen, K.W.A. (author), Hopp, Torsten (author), Hesser, Jürgen (author)Objective. The image reconstruction of ultrasound computed tomography is computationally expensive with conventional iterative methods. The fully learned direct deep learning reconstruction is promising to speed up image reconstruction significantly. However, for direct reconstruction from measurement data, due to the lack of real labeled...journal article 2023
- document
-
Renaud, G.G.J. (author), Salles, Sébastien (author)In this chapter, we first review the reasons why conventional ultrasonography fails to image the interior of bones. Next we show our recent work on imaging a cortical bone layer with ultrasound. Revealing the shape of the cortex of a bone, in particular its thickness, is of interest for evaluating bone strength. In addition we describe how...journal article 2022
- document
-
Oosterlo, P. (author)This dissertation focuses on the Eems-Dollard estuary in the north of the Netherlands and contributes to the MVED (’Meerjarige Veldmetingen Eems-Dollard’) field measurement project in the area. The Eems-Dollard estuary is part of the Wadden Sea, a shallow shelf sea with barrier islands, deep tidal channels, shallow tidal flats and wetlands. The...doctoral thesis 2021
- document
-
Kiraz, Mert S. R. (author), Snieder, Roel (author), Wapenaar, C.P.A. (author)Marchenko algorithms retrieve the Green’s function for arbitrary subsurface locations, and the retrieved Green’s function includes the primary and multiple reflected waves. The Marchenko algorithms require the estimate of the direct arrivals and the reflected waves; however, most previous Marchenko algorithms also require the up/down components...book chapter 2021
- document
-
Balasubramani, Vinoth (author), Kujawińska, Małgorzata (author), Allier, Cédric (author), Anand, Vijayakumar (author), Cheng, Chau Jern (author), Depeursinge, Christian (author), Hai, Nathaniel (author), Kalkman, J. (author), Park, Yong Keun (author)Quantitative Phase Imaging (QPI) provides unique means for the imaging of biological or technical microstructures, merging beneficial features identified with microscopy, interferometry, holography, and numerical computations. This roadmap article reviews several digital holography-based QPI approaches developed by prominent research groups....review 2021
- document
-
Horck, Mats (author)Exposure to excessive community noise has become a large environmental health concern. Noise pollution continues to increase while it is accompanied by direct, as well as cumulative adverse health effects. In addition, prolonged exposure to excessive noise levels also has a negative economic impact. The incorporation of numerical tools in the...master thesis 2020
- document
-
Tsionis, Ioannis (author)This research focuses on aircraft noise exposed urban spaces around Amsterdam Schiphol airport. In particular, a case site in Rijsenhout is studied, where a representation of the noise wave propagation due to refraction is performed. Subsequently, a series of landscape configurations regarding geometry are gradually tested through acoustic...master thesis 2020
- document
-
van der Reijden, Ineke (author)For the design of coastal structures, the hydraulic loads that act on the coast should be known. These are often based on extrapolation of measurements. However, if the physical relation is unknown, large errors could be made. Therefore, a numerical model can be set up to take the most important processes into account.Yet, uncertainties are...master thesis 2020
- document
-
Ataei Dadavi, I. (author), Chakkingal, M. (author), Kenjeres, S. (author), Kleijn, C.R. (author), Tummers, M.J. (author)This paper reports on an experimental study of mixed convection flow and heat transfer in a vented, differentially side-heated cubical cavity filled with a porous medium consisting of relatively large solid low-conductivity spheres. Rayleigh numbers and Reynolds numbers are varied over the ranges 6 × 10<sup>6</sup> < Ra < 7 × 10<sup>7<...journal article 2020
- document
-
Pomaska, Manuel (author), Köhler, Malte (author), Procel Moya, P.A. (author), Zamchiy, Alexandr (author), Singh, Aryak (author), Kim, Do Yun (author), Isabella, O. (author), Zeman, M. (author), Li, Shenghao (author)N-type microcrystalline silicon carbide (μc-SiC:H(n)) is a wide bandgap material that is very promising for the use on the front side of crystalline silicon (c-Si) solar cells. It offers a high optical transparency and a suitable refractive index that reduces parasitic absorption and reflection losses, respectively. In this work, we...journal article 2020
- document
-
Fokkema, J.T. (author), van den Berg, Peter M. (author)Maxwell's equations are transformed from a Cartesian geometry to a Riemannian geometry. A geodetic path in the Riemannian geometry is defined as the raypath on which the electromagnetic energy efficiently travels through the medium. Consistent with the spatial behavior of the Poynting vector, the metric tensor is required to be functionally...journal article 2020
- document
-
Fazzi, L. (author), Groves, R.M. (author)Reflective Tilted Fiber Bragg Grating (TFBG) sensors have intriguing sensing capabilities due to the resonance-peaks present in their transmitted spectrum. Previous works measured the external refractive index (ERI) in which the TFBG sensor is placed, by considering the wavelengths or the envelope of the cladding-modes resonances. In this...journal article 2020
- document
-
Al-Younis, Wardeh (author), Nevarez, Christina (author), Abdullah-Al-Mamun, Mohammad (author), Sandoval, Steven (author), Basu, S. (author), Voelz, David (author)We develop and study two approaches for the prediction of optical refraction effects in the lower atmosphere. Refraction can cause apparent displacement or distortion of targets when viewed by imaging systems or produce steering when propagating laser beams. Low-cost, time-lapse camera systems were deployed at two locations in New Mexico to...journal article 2020
- document
-
Mohammadloo, Tannaz H. (author), Snellen, M. (author), Renoud, Weston (author), Beaudoin, Jonathan (author), Simons, D.G. (author)In this contribution a method for correcting bathymetric measurements affected by inaccurate water column sound speed profiles (SSPs) is presented. The method exploits the redundancy in the multibeam echosounder measurements obtained from the overlap of adjacent swaths by minimizing the difference between depths along overlapping swaths. Two...journal article 2019
- document
-
Ataei Dadavi, I. (author), Rounaghi, Nima (author), Chakkingal, M. (author), Kenjeres, S. (author), Kleijn, C.R. (author), Tummers, M.J. (author)Flow and heat transfer in a differentially side heated cubic cavity filled with relatively large solid spheres forming a coarse porous medium have been studied experimentally. Nusselt numbers were measured for Rayleigh numbers between 1.9 × 10<sup>7</sup> and 1.7 × 10<sup>9</sup>, solid-to-fluid conductivity ratios between 0.32 and 618, and...journal article 2019
- document
-
Al-Younis, Wardeh (author), Nevarez, Christina (author), Voelz, David (author), Sandoval, Steven (author), Basu, S. (author)This work details the analysis of time-lapse images with a point-tracking image processing approach along with the use of an extensive numerical weather model to investigate image displacement due to refraction. The model is applied to create refractive profile estimates along the optical path for the days of interest. Ray trace analysis...conference paper 2019
- document
-
Hsu, C. (author), Frisenda, Riccardo (author), Schmidt, Robert (author), Arora, Ashish (author), de Vasconcellos, Steffen Michaelis (author), Bratschitsch, Rudolf (author), van der Zant, H.S.J. (author), Castellanos-Gomez, Andres (author)An interesting aspect of 2D materials is the change of their electronic structure with the reduction of thickness. Molybdenum and tungsten-based transition metal dichalcogenides form an important family of 2D materials, whose members show a thickness-dependent bandgap and strong light–matter interaction. In this work, the experimental...journal article 2019
- document
- Oosterlo, P. (author), van der Meer, J.W. (author), Hofland, B. (author), van Vledder, G.P. (author) abstract 2018
- document
-
Alpeggiani, F. (author), Bliokh, K. Y. (author), Nori, F. (author), Kuipers, L. (author)Optical helicity density is usually discussed for monochromatic electromagnetic fields in free space. It plays an important role in the interaction with chiral molecules or nanoparticles. Here we introduce the optical helicity density in a dispersive isotropic medium. Our definition is consistent with biorthogonal Maxwell electromagnetism in...journal article 2018