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The Adiabatic Theorem and Linear Response Theory for Extended Quantum Systems KU Leuven
© Springer-Verlag GmbH Germany, part of Springer Nature 2018. The adiabatic theorem refers to a setup where an evolution equation contains a time-dependent parameter whose change is very slow, measured by a vanishing parameter ∈. Under suitable assumptions the solution of the time-inhomogenous equation stays close to an instantaneous fixpoint. In the present paper, we prove an adiabatic theorem with an error bound that is independent of the ...
From Floer theory in symplectic and hyperk¨ahler geometry via integrable Hamiltonian systems and Morse theory and n-category theory to optimal mass transport and integer partitions Universiteit Antwerpen
Positioning the normalized systems theory in a design theory framework Universiteit Antwerpen
Several frameworks have been proposed to define design science and design theory. For this reason, positioning a research stream within both paradigms has become a difficult exercise. In this paper, the Normalized Systems (NS) theory is positioned within design science and design theory, in particular the design theory framework formulated by Gregor & Jones (2007). Normalized Systems theory has been proposed as a way to cope with the ever ...
”We are not offering a helpful theory of art." Towards a possible integration of systems theory and theatre studies Vrije Universiteit Brussel
The systems theory of the German sociologist Niklas Luhmann studies all possible forms of sociability. Therefore, it is not only an all-encompassing theory, it is also considered to be difficultly employable as a fully-fledged heuristic and epistemological research tool. Within theatre studies, it could not yet find full acceptance, possibly due to its explicit non-human character. With this article we would like to investigate the possible ...
The restricted active space followed by second-order perturbation theory method: Theory and application to the study of CuO2 and Cu2O2 systems KU Leuven
A multireference second-order perturbation theory using a restricted active space self-consistent field wave function as reference (RASPT2/RASSCF) is described. This model is particularly effective for cases where a chemical system requires a balanced orbital active space that is too large to be addressed by the complete active space self-consistent field model with or without second-order perturbation theory (CASPT2 or CASSCF, respectively). ...
Positioning the normalized systems theory in a design theory framework Universiteit Antwerpen
Behavioral systems theory in data-driven analysis, signal processing, and control Vrije Universiteit Brussel
The behavioral approach to systems theory, put forward 40 years ago by Jan C. Willems, takes a representation-free perspective of a dynamical system as a set of trajectories. Till recently, it was an unorthodox niche of research but has gained renewed interest for the newly emerged data-driven paradigm, for which it is uniquely suited due to the representation-free perspective paired with recently developed computational methods. A result ...
On applying normalized systems theory to the evolvability of open source ERP systems Universiteit Antwerpen
Enterprise Resource Planning (ERP) systems have become the most important part of enterprises’ information systems. Moreover, evolvability is widely considered to be an important concern for the design and development of software architectures. In particular, evolvability can be considered as a criterion to evaluate and analyse the quality and usefulness of ERP packages. The purpose of this research is to investigate the evolvability of ERP ...
Integrating information systems using normalized systems theory Universiteit Antwerpen
New technical and business opportunities lead to the adoption of new information systems. Integrating these new systems with the existing application landscape poses many challenges, especially when legacy systems are involved. These systems may rely on completely different architectures or assumptions regarding functionality. Normalized Systems Theory addresses this issue by stating that information systems should behave as stable systems. It ...