Publicaties
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Measurement theory for closed quantum systems Universiteit Antwerpen
We introduce the concept of a "classical observable" as an operator with vanishingly small quantum fluctuations on a set of density matrices. Their study provides a natural starting point to analyse the quantum measurement problem. In particular, it allows to identify Schrodinger cats and the associated projection operators intrinsically, without the need to invoke an environment. We discuss how our new approach relates to the open system ...
Systems theory approaches to researching educational organizations Universiteit Gent
In modern society, organizations are present in almost every social domain. From the end of the 18th century onward, education has predominantly taken place in school organizations. Of course, education still takes place within families, but to send a child to school was from around that time onward no longer seen to reflect unfavorably on its family. Schools are no longer a symptom of the family’s failure. The family and the school, rather, ...
Building evolvable software using normalized systems theory Universiteit Antwerpen
Normalized Systems (NS) theory has recently been proposed as an approach to develop agile and evolvable software by defining theorems and design patterns for software architectures. In this paper we discuss the NS development process, which is illustrated by means of an elaborate description of a case regarding a budget management application developed according to the theory. Advantages of the NS approach, such as swift application development ...
Multiconfigurational Second-Order Perturbation Theory Restricted Active Space (RASPT2) Studies on Mononuclear First-Row Transition-Metal Systems KU Leuven
A series of model transition-metal complexes, CrF6, ferrocene, Cr(CO)6, ferrous porphin, cobalt corrole, and FeO/FeO(-), have been studied using second-order perturbation theory based on a restricted active space self-consistent field reference wave function (RASPT2). Several important properties (structures, relative energies of different structural minima, binding energies, spin state energetics, and electronic excitation energies) were ...
Theory for exposure prediction in an indoor environment due to UWB systems Universiteit Gent
A simple theory based on room electromagnetics theory is presented. The theory primarily models the Diffuse Multipath Components (DMC) power density with a simple circuit model, and afterwards include the Line-Of-sight component (LOS) in order to determine the whole-body absorption rate for Ultra-Wide-Band (UWB) systems. The model may be very useful for prediction tools in realistic environment.
Theory of many-body localization in periodically driven systems KU Leuven
© 2016 Elsevier Inc. We present a theory of periodically driven, many-body localized (MBL) systems. We argue that MBL persists under periodic driving at high enough driving frequency: The Floquet operator (evolution operator over one driving period) can be represented as an exponential of an effective time-independent Hamiltonian, which is a sum of quasi-local terms and is itself fully MBL. We derive this result by constructing a sequence of ...
Research on adhesion in asphalt-aggregate systems based on surface energy theory Vrije Universiteit Brussel
Based on the surface energy theory, surface energy parameters of two kinds of asphalt and four kinds of aggregate were obtained by a static contact angle method, and the adhesive work and the exfoliated work of different asphalt-aggregate systems were calculated to determine whether the adhesion between different asphalt-aggregate systems was good or not. Meanwhile, a freeze-thaw splitting test was used for verification. The results suggest that ...