- document
-
Zhang, A. (author), Dieudonné, A.A.M. (author)Microbially induced carbonate precipitation (MICP) involves bacteria to drive calcite precipitation and naturally cement soils, thereby improving soils performance. Experimental studies have shown that bio-cemented specimen can suffer from severe spatial inhomogeneity of the calcite content, leading to large uncertainty in treatment...conference paper 2023
- document
-
Koorevaar, Loek (author)The problem of calibrating time-inhomogeneous exponential Lévy models with finite jump activity based on market prices of plain vanilla options is studied. Belomestny and Reiß introduced an estimation procedure for calibration in the homogeneous case with one maturity. The open-ended question that will be addressed is if we can extend this model...master thesis 2022
- document
-
Floreani, S. (author)Interacting particle systems (IPS) is a subfield of probability theory that provided a fruitful framework in which several questions of physical interests have been answered with mathematical rigor. An interacting particle system is a stochastic system consisting of a very large number of particles interacting with each other. The class of IPS...doctoral thesis 2022
- document
-
Wassenaar, Vincent (author)A graph G=(V,E) is a mathematical model for a network with vertex set V and edge set E. A Random Graph model is a probabilistic graph. A Random Geometric Graph is a Random Graph were each vertex has a location in a space χ. We compare the Erdos-Rényi random graph, G(n,p), to the Random Geometric Graph model, RGG(n,r) where, in general we use r=c...bachelor thesis 2022
- document
-
Aggariyo Wanagiri, Aggariyo (author)Low field magnetic resonance imaging (MRI) scanners provide a unique low-cost alternative to conventional MRI scanners. Nevertheless, low-field scanners come with drawbacks such as reduced signal-to-noise ratio and resolution, and also distorted images caused by magnetic field inhomogeneity and non-linear gradient fields. Despite this, it still...master thesis 2022
- document
-
Nijsse, Hannah (author)Low-field MRI is susceptible to temperature changes in magnet temperature, resulting in time-dependent inhomogeneities. This causes time-dependent phase shifts in the measured signal, leading to image distortions. In this project, a method is proposed to interleave short magnetic field (B0) mapping sequences in the target image acquisition for...master thesis 2022
- document
-
Abramian, Andrei K. (author), Vakulenko, Sergei A. (author), van Horssen, W.T. (author)In this paper the dynamics of a weakly nonlinear elastic string on a Winkler elastic foundation is studied. The foundation may be spatially heterogeneous. At one end of the string a mass-spring system is attached, and the other end of the string is fixed. The string is assumed to be long, and the lower part of the spectrum of the string is...journal article 2022
- document
-
Jiang, Quanxin (author), Morete Barbosa Bertolo, V. (author), Popovich, V. (author), Sietsma, J. (author), Walters, C.L. (author)Thick section S690 QT steel is modelled with a modified multibarrier model that is based on the weakest-link mechanism. Segregation bands are modelled as discrete layers which have different grain size, yield properties, and local fracture parameters from outside of the bands. The results show that embrittlement from segregation bands can...journal article 2022
- document
-
Liesker, Bas (author)Magnetic resonance imaging (MRI) scanners are a crucial diagnostic tool for radiologists. They are able to render two and threedimensional images of the body without exposure to harmful radiation. MRI systems are, however, costly to build and maintain. This adversely impacts access to these scanners in developing regions. In an effort to...master thesis 2021
- document
-
Bristogianni, T. (author), Oikonomopoulou, F. (author), Veer, F.A. (author), Nijsse, R. (author)The emerging interest in the architectural applications of cast glass components reveals a knowledge gap on the mechanical properties of cast glass. Apart from its chemical composition, cast glass is characterized by its manufacturing history and thermal profile, often inheriting a set of defects that define its properties. The role that...journal article 2021
- document
-
Muilwijk, Corné (author), van den Akker, H.E.A. (author)This paper describes the effects of uniform and non-uniform liquid co-flow on the bubbly flow in a rectangular column (with two inlets) deliberately aerated unevenly. The two vertical bubbly streams, comprising uniform bubbles, started interacting downstream of the trailing edge of a splitter plate. This study quantifies the emergence of...journal article 2021
- document
-
Faragau, A.B. (author), Keijdener, C. (author), de Oliveira Barbosa, J.M. (author), Metrikine, A. (author), van Dalen, K.N. (author)Transition zones in railway tracks are locations with a significant variation of track properties (i.e. foundation stiffness) encountered near structures such as bridges and tunnels. Due to strong amplification of the track’s response, transition zones are prone to rapid degradation. To investigate the degradation mechanisms in transition...journal article 2021
- document
-
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
- document
-
Vedula, Mano (author)Demyelination is described as loss of myelin sheath in neurons which could lead to disruption in signal transmission in nervous system. Inhomogeneous Magnetization Transfer(ihMT) is a novel MRI technique used to image myelin. It uses the dipolar coupling between methyl chains in lipid layers of myelin to acquire myelin specific information. In...master thesis 2020
- document
-
Abramian, A. (author), Vakulenko, Sergei A. (author), Lukichev, Dmitry V. (author), van Horssen, W.T. (author)In this paper, the dynamics and the buckling loads for an Euler–Bernoulli beam resting on an inhomogeneous elastic, Winkler foundation are studied. An analytical, asymptotic method is proposed to determine the stability of the Euler–Bernoulli beam for various types of inhomogeneities in the elastic foundation taking into account different...journal article 2020
- document
-
Lindemulder, N. (author), Veraar, M.C. (author)In this paper we consider the Laplace operator with Dirichlet boundary conditions on a smooth domain. We prove that it has a bounded H<sup>∞</sup>-calculus on weighted L<sup>p</sup>-spaces for power weights which fall outside the classical class of A<sub>p</sub>-weights. Furthermore, we characterize the domain of the operator and derive...journal article 2020
- document
-
Faragau, A.B. (author), Mazilu, Traian (author), Metrikine, A. (author), Lu, T. (author), van Dalen, K.N. (author)Transition zones in railway tracks are areas with considerable variation of track properties (e.g., foundation stiffness) which may cause strong amplification of the response, leading to rapid degradation of the track geometry. Two possible indicators of degradation in the supporting structure are identified, namely the wheel-rail contact...journal article 2020
- document
-
Angst, Ueli M. (author), Geiker, Mette R. (author), Alonso, Maria Cruz (author), Polder, R.B. (author), Elsener, Bernhard (author), Wong, Hong (author), Michel, Alexander (author), Hornbostel, Karla (author), Sanchez, Mercedes (author)The steel–concrete interface (SCI) is known to influence corrosion of steel in concrete. However, due to the numerous factors affecting the SCI—including steel properties, concrete properties, execution, and exposure conditions—it remains unclear which factors have the most dominant impact on the susceptibility of reinforced concrete to...review 2019
- document
-
Lindemulder, N. (author)In this paper, we establish weighted L<sup>q</sup>–L<sup>p</sup>-maximal regularity for linear vector-valued parabolic initial-boundary value problems with inhomogeneous boundary conditions of static type. The weights we consider are power weights in time and in space, and yield flexibility in the optimal regularity of the initial-boundary...journal article 2019
- document
-
Faragau, A.B. (author), Metrikine, A. (author), van Dalen, K.N. (author)Transition zones in railway tracks are areas with considerable variation of track properties (i.e., foundation stiffness) encountered near structures such as bridges and tunnels. Due to strong amplification of the response, transition zones require frequent maintenance. To better understand the underlying degradation mechanisms, a one...journal article 2019