Publicaties
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Stability of Measurement Outcomes for Voluntary Task Performance in Participants With Ankle Instability and Healthy Controls KU Leuven
CONTEXT: Acceptable measurement stability during data collection is critically important to research. To interpret differences in measurement outcomes among participants or changes within participants after an intervention program, we need to know whether the measurement is stable and consistent. OBJECTIVE: To determine the within-session stability of muscle activation patterns for a voluntary postural-control task in a group of noninjured ...
Stability and instability towards delocalization in many-body localization systems KU Leuven
© 2017 American Physical Society. We propose a theory that describes quantitatively the (in)stability of fully many-body localization (MBL) systems due to ergodic, i.e., delocalized, grains, that can be, for example, due to disorder fluctuations. The theory is based on the ETH hypothesis and elementary notions of perturbation theory. The main idea is that we assume as much chaoticity as is consistent with conservation laws. The theory describes ...
Many-body localization: stability and instability KU Leuven
Rare regions with weak disorder (Griffiths regions) have the potential to spoil localization. We describe a non-perturbative construction of local integrals of motion (LIOMs) for a weakly interacting spin chain in one dimension, under a physically reasonable assumption on the statistics of eigenvalues. We discuss ideas about the situation in higher dimensions, where one can no longer ensure that interactions involving the Griffiths regions are ...
Effect of tape on dynamic postural stability in subjects with chronic ankle instability Universiteit Gent
Stability and instability in East Asia's major power relations Universiteit Antwerpen
Injection locking and polarization switching bistability in a 1550 nm VCSEL subject to parallel optical injection Vrije Universiteit Brussel
We present experimental and theoretical results of bistable polarization switching in a single transverse mode 1550 nm vertical-cavity surface-emitting laser (VCSEL) subject to parallel optical injection. We focus our analysis on the bistability induced by power variation of the master laser found on the recently observed state of simultaneous injection locking of the parallel polarization mode and excitation of the orthogonal polarization mode, ...
Non-linear light propagation and bistability in nematic liquid crystals Universiteit Gent
Liquid crystals can switch under influence of an electric field or under influence of incident light. In this paper we provide a mathematical description including electrical, optical and elastic torques. Depending on the applied voltage and the incident light, bistability in the director orientation may be possible. Under certain conditions, the sequence of applying incident TM polarized light and a static voltage allows to access different ...
Optical bistability and flip-flop operation in DFB laser diodes injected with a CW signal - art. no. 69970N Universiteit Gent
All-optical. flip-flops draw more and more attention as potential parts of all-optical packet or burst switching schemes. Recently several schemes for such all-optical flip-flops have been proposed, e.g. mutually coupled laser diodes, Mach-Zehnder interferometers with fed back output and ring lasers. All flip-flops are based on bistable behaviour and oil the possible switching between the two stable states using short optical pulses. Previously, ...