Searched for: subject:"monolith"
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Akkerman, I. (author), ten Eikelder, M.F.P. (author)
This paper presents a new monolithic free-surface formulation that exhibits correct kinetic and potential energy behavior. We focus in particular on the temporal energy behavior of two-fluids flow with varying densities. Correct energy behavior here means that the actual energy evolution of the numerical solution matches the evolution as...
journal article 2019
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Borghi, G. (author), Tabacchini, V. (author), Bakker, P.J. (author), Schaart, D.R. (author)
Recently, a monolithic scintillator detector for time-of-flight (TOF)/depth-of-interaction (DOI) positron emission tomography (PET) was developed. It has a detector spatial resolution of ∼1.7 mm full-width-at-half-maximum (FWHM), a coincidence resolving time (CRT) of ∼215 ps FWHM, and ∼4.7 mm FWHM DOI resolution. Here, we demonstrate, for the...
journal article 2018
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Tabacchini, V. (author), Surti, Suleman (author), Borghi, G. (author), Karp, Joel S. (author), Schaart, D.R. (author)
We have recently built and characterized the performance of a monolithic scintillator detector based on a 32 mm × 32 mm × 22 mm LYSO:Ce crystal read out by digital silicon photomultiplier (dSiPM) arrays coupled to the crystal front and back surfaces in a dual-sided readout (DSR) configuration. The detector spatial resolution appeared to be...
journal article 2017
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Si, F.T. (author), Isabella, O. (author), Zeman, M. (author)
The benefit of two-terminal multijunction solar cells in regard to the number<br/>of junctions (subcells) is critically evaluated. The optical and electrical losses<br/>inherent in the construction of multijunction cells are analyzed using information<br/>from thin-film silicon photovoltaics as a representative case. Although<br/>the...
journal article 2017
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Borghi, G. (author), Peet, B.J.A. (author), Tabacchini, V. (author), Schaart, D.R. (author)
New applications for positron emission tomography (PET) and combined PET/magnetic resonance imaging (MRI) are currently emerging, for example in the fields of neurological, breast, and pediatric imaging. Such applications require improved image quality, reduced dose, shorter scanning times, and more precise quantification. This can be...
journal article 2016
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Borghi, G. (author), Tabacchini, V. (author), Schaart, D.R. (author)
Gamma-ray detectors based on thick monolithic scintillator crystals can achieve spatial resolutions &lt;2 mm full-width-at-half-maximum (FWHM) and coincidence resolving times (CRTs) better than 200 ps FWHM. Moreover, they provide high sensitivity and depth-of-interaction (DOI) information. While these are excellent characteristics for...
journal article 2016
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Tabacchini, V. (author), Borghi, G. (author), Schaart, D.R. (author)
Gamma-ray detectors based on bright monolithic scintillation crystals coupled to pixelated photodetectors are currently being considered for several applications in the medical imaging field. In a typical monolithic detector, both the light intensity and the time of arrival of the earliest scintillation photons can be recorded by each of the...
journal article 2015
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Bakker, J.J.W. (author)
The performance of heterogeneous catalysts in multiphase reactions in general is governed by different types of extrinsic and intrinsic structural effects on all length scales, i.e., on the macro- (m to cm), meso- (mm to µm), and microlevel (nm). This PhD research, with a catalysis-engineering approach, focused on several of these multiscale...
doctoral thesis 2012
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Lukovic, M. (author), Ye, G. (author), Van Breugel, K. (author)
This paper highlights the importance of achieving durable and long-term predictable repair of reinforced concrete structures. The performance of concrete repair in past and current engineering practice, including all types of repair and application of different materials, is often unsatisfactory. One of the reasons for this lays in the fact that...
conference paper 2012
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Van Dam, H.T. (author)
Positron emission tomography (PET) is one of the key medical imaging modalities in the diagnosis and staging of e.g. cancer and cardiovascular diseases. The image formation is based on the measurement of annihilation photon pairs in the detector ring of the PET scanner. The diagnostic value of a PET image depends crucially on the image quality,...
doctoral thesis 2012
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Kritzinger, H.P. (author)
The Monolithic Stirrer Reactor (MSR) is a novel concept for heterogeneously catalyzed reactors and is presented as an alternative device to slurry reactors. It uses a modified stirrer on which structured catalyst supports (monoliths) are fixed to form permeable blades. The monoliths consist of small square parallel channels on which a layer of...
doctoral thesis 2011
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Van der Laan, D.J. (author)
Monolithic scintillator detectors are very promising for high-resolution high-sensitivity PET. These detectors consist of several cubic centimetres of scintillating material coupled on one or more sides to position-sensitive avalanche photo-diode (APD) arrays. The coordinates of the entry point of an incoming gamma photon are estimated from the...
doctoral thesis 2009
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Maas, M.C. (author)
Positron emission tomography (PET) is a technique for imaging the 3-dimensional distribution of radio-labelled molecules in vivo. This technique plays an increasingly important role in preclinical research involving mice and rats. The small dimensions of these animals impose stringent requirements on both the image resolution and the sensitivity...
doctoral thesis 2008
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Maas, M. (author), Schaart, D.R. (author), Van der Laan, D.J. (author), Van Dam, T. (author), Huizenga, J. (author), Brouwer, J.C. (author), Bruyndonckx, P. (author), Lemaitre, C. (author), Van Eijk, C.W.E. (author)
journal article 2008
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De Lathouder, K.M. (author), Smeltink, M.W. (author), Straathof, A.J.J. (author), Paasman, M.A. (author), Van de Sandt, E.J.A.X. (author), Kapteijn, F. (author), Moulijn, J.A. (author)
The objective of this work was to develop a hydrogel-coated monolith for the entrapment of penicillin G acylase (E. coli, PGA). After screening of different hydrogels, chitosan was chosen as the carrier material for the preparation of monolithic biocatalysts. This protocol leads to active immobilized biocatalysts for the enzymatic hydrolysis of...
journal article 2008
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De Lathouder, K.M. (author)
Recently, biocatalysis has become an interesting alternative for conventional industrial processes. Enzyme reactions are highly selective and fast, and can be performed under ambient conditions. A drawback of the use of enzymes is their fragile nature. Stirring, high temperature, or solvents can cause deactivation. Also separation of the free...
doctoral thesis 2007
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Hakonsen, S.F. (author), Silberova, B. (author), Holmen, A. (author)
journal article 2007
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Hron, J. (author), Turek, S. (author)
We investigate a monolithic algorithm to solve the problem of time dependent interaction between an incompressible viscous fluid and an elastic solid. The continuous formulation of the problem and its discretization is done in a monolithic way, treating the problem as one continuum. The Q2/P1 finite elements are used for the discretization and...
conference paper 2006
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Van Brummelen, E.H. (author), Michler, C. (author), De Borst, R. (author)
Subiteration forms the basic iterative method for solving the aggregated equations in fluid-structure-interaction problems, in which the fluid and structure equations are solved alternately subject to complementary partitions of the interface conditions. However, this subiteration process can be defective or inadequate, as it is endowed with...
report 2005
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De Deugd, R.M. (author)
doctoral thesis 2004
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