4,146 research outputs found
Dilations of partial representations of Hopf algebras
We introduce the notion of a dilation for a partial representation (i.e. a
partial module) of a Hopf algebra, which in case the partial representation
origins from a partial action (i.e.a partial module algebra) coincides with the
enveloping action (or globalization). This construction leads to categorical
equivalences between the category of partial -modules, a category of
(global) -modules endowed with a projection satisfying a suitable
commutation relation and the category of modules over a (global) smash product
constructed upon , from which we deduce the structure of a Hopfish algebra
on this smash product. These equivalences are used to study the interactions
between partial and global representation theory.Comment: 25 pages. Corrected several typos, final version to appear in Journal
of the London Mathematical Societ
The influence of voluntary upper body exercise on the performance of stimulated paralysed human quadriceps
In this study the influence of voluntary upper body exercise on the performance of stimulated paralysed human quadriceps was investigated in five subjects with spinal cord lesions in the thoracic spine. The experimental setup consisted of computer-controlled stimulation of the quadriceps using electrodes on the surface of the skin, a dynamometer for isometric or isokinetic loading of the lower leg, and a rowing ergometer for upper body exercise. In all subjects, quadriceps fatigue tests were conducted to study the influence of upper body exercise on knee torque during sustained continuous or intermittent stimulation of quadriceps. The relative asymptotic torque appeared to be significantly higher with the presence of upper body exercise than without. This was consistently found both between trials (starting with or without upper body exercise) as well as within trials, when upper body exercise was started or stopped during the trial. No significant influence of upper body exercise on the time constant of initial torque decline was found
A Triangular Tessellation Scheme for the Adsorption Free Energy at the Liquid-Liquid Interface: Towards Non-Convex Patterned Colloids
We introduce a new numerical technique, namely triangular tessellation, to
calculate the free energy associated with the adsorption of a colloidal
particle at a flat interface. The theory and numerical scheme presented here
are sufficiently general to handle non-convex patchy colloids with arbitrary
surface patterns characterized by a wetting angle, e.g., amphiphilicity. We
ignore interfacial deformation due to capillary, electrostatic, or
gravitational forces, but the method can be extended to take such effects into
account. It is verified that the numerical method presented is accurate and
sufficiently stable to be applied to more general situations than presented in
this paper. The merits of the tessellation method prove to outweigh those of
traditionally used semi-analytic approaches, especially when it comes to
generality and applicability.Comment: 21 pages, 11 figures, 0 table
Influence of the sample geometry on the vortex matter in superconducting microstructures
The dependence of the vortex penetration and expulsion on the geometry of
mesoscopic superconductors is reported. Hall magnetometry measurements were
performed on a superconducting Al square and triangle. The stability of the
vortex patterns imposed by the sample geometry is discussed. The
field-temperature diagram has been reconstructed showing the transitions
between states with different vorticity. We have found that the vortex
penetration is only weakly affected by the vortex configuration inside the
sample while the expulsion is strongly controlled by the stability of the
vortex patterns. A qualitative explanation for this observation is given.Comment: 6 pages, 4 figures, accepted for publication in Phys. Rev.
Towards a framework for knowledge discovery: an architecture for distributed inductive databases
We discuss how data mining, patternbases and databases can be integrated into inductive databases, which make data mining an inductive query process. We propose a software architecture for such inductive databases, and extend this architecture to support the clustering of inductive databases and to make them suitable for data mining on the grid.Applications in Artificial Intelligence - Knowledge DiscoveryRed de Universidades con Carreras en Informática (RedUNCI
Word predictability blurs the lines between production and comprehension : Evidence from the production effect in memory
Acknowledgements We are grateful to Faith Tan for data collection and speech onset measurements, and to Opal Harshe for data collection. JR was supported by the Dutch Science Foundation (NWO) grant 275-89-032. NWO played no role in the study design, the collection, analysis and interpretation of data, the writing of the report, or in the decision to submit the article for publication.Peer reviewedPostprin
Lateralized electrical brain activity reveals covert attention allocation during speaking
Acknowledgements We thank Svetlana Gerakaki for providing us with the pictures of objects with a canonical orientation and Sophie Kirkels and Annelies van Wijngaarden for assistance with editing the pictures.Peer reviewedPostprin
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