Search results for "Aide"

Latvijas Universitātes Raksti; 767 .sēj.

2011

Skulls, Tree Bark, Fossils

2021

AbstractStudies of material objects in the field of memory studies have followed diverse epistemological and disciplinary trajectories, but their shared characteristic has been the questioning of philosophical assumptions concerning human relations with inanimate things and lower-level organic objects, such as plants, within the Aristotelian hierarchy of beings. Rather than accept at face value their categorizations as passive or deficient in comparison to the human subject, critical scholarship has reformulated the place and role of nonhuman entities in culture. This essay examines the nexus of materiality and memory in the work of the French philosopher and art historian Georges Didi-Hube…

Conformation constraints for efficient viscoelastic fluid simulation

2017

The simulation of high viscoelasticity poses important computational challenges. One is the difficulty to robustly measure strain and its derivatives in a medium without permanent structure. Another is the high stiffness of the governing differential equations. Solutions that tackle these challenges exist, but they are computationally slow. We propose a constraint-based model of viscoelasticity that enables efficient simulation of highly viscous and viscoelastic phenomena. Our model reformulates, in a constraint-based fashion, a constitutive model of viscoelasticity for polymeric fluids, which defines simple governing equations for a conformation tensor. The model can represent a diverse pa…

Generation of Bessel beam arrays through Dammann gratings.

2012

In this work we apply the Dammann grating concept to generate an equal-intensity square array of Bessel quasi-free diffraction beams that diverge from a common center. We generate a binary phase mask that combines the axicon phase with the phase of a Dammann grating. The procedure can be extended to include vortex spiral phases that generate an array of optical pipes. Experimental results are provided by means of a twisted nematic liquid crystal display operating as a binary π phase spatial light modulator.

Liquid crystal spatial light modulator with very large phase modulation operating in high harmonic orders.

2013

Unusually large phase modulation in a commercial liquid crystal spatial light modulator (LCSLM) is reported. Such a situation is obtained by illuminating with visible light a device designed to operate in the infrared range. The phase modulation range reaches 6π radians in the red region of the visible spectrum and 10π radians in the blue region. Excellent diffraction efficiency in high harmonic orders is demonstrated despite a concomitant and non-negligible Fabry–Perot interference effect. This type of SLM opens the possibility to implement diffractive elements with reduced chromatic dispersion or chromatic control.

On the Existence of 1-Bounded Bi-ideals with the WELLDOC Property

2015

A combinatorial condition called well distributedoccurrences, or WELLDOC for short, has been introducedrecently. The proofs that WELLDOC property holds for thefamily of Sturmian words, and more generally, for Arnoux-Rauzy words are given in two papers by Balkova et al. The WELLDOC property for bounded bi-ideals is analysed inthis paper. The existence of a 1-bounded bi-ideal over thefinite alphabet that satisfies the WELLDOC property has beenproved by the authors.

Nondeterministic Unitary OBDDs

2017

We investigate the width complexity of nondeterministic unitary OBDDs (NUOBDDs). Firstly, we present a generic lower bound on their widths based on the size of strong 1-fooling sets. Then, we present classically “cheap” functions that are “expensive” for NUOBDDs and vice versa by improving the previous gap. We also present a function for which neither classical nor unitary nondeterminism does help. Moreover, based on our results, we present a width hierarchy for NUOBDDs. Lastly, we provide the bounds on the widths of NUOBDDs for the basic Boolean operations negation, union, and intersection.

Numerical approximation of mixed models for digital integrated circuits

1991

To analyse an electrical network many CAD (Computer Aided Design) circuit simulators are available today. The most well-known is probably SPICE -Nagel [1975]. Although this type of simulator is able to precisely compute the transient performances (as delay time), the usage of complete models of devices implies an extremely high time consumption. So, the circuit simulators are unappropriate for the initial stage of VLSI design where a high speed timing analyser (“timing simulator”) is required. To this goal, alternative approaches using either simpler device models or simpler numerical algorithms or easily computable formulae for delay time approximation, have been developed in the past deca…

Mary Blairin taiteen murros : Disneyn konseptitaiteilija vai modernisti?

2017

Mary Blairin taiteen murros naturalistisesta moderniin kolorismiin on ollut suurena vaikuttajana Walt Disney Companyn tyylin muutokseen ja hänen taiteensa vaikuttaa yhä nykyisiin konseptitaiteilijoihin. Tutkielma tarkastelee, miten yhteiskunta ja hänen henkilökohtainen elämänsä on vaikuttanut hänen taiteensa murrokseen. Mary Blairs shift from a naturalistic style to a modern coloristic one has been a huge impact on the style of Walt Disney Company and her work still impacts concept artist today. This study looks into how society and her personal life have affected the change in her art.

Accompagnement de l'évaluation d'un programme d'aide à la réussite étudiante par un comité scientifique et d'évaluation

2023

Cette contribution présente comment une instance d’évaluation d’un programme d’aide à la réussite étudiante s’est construite durant quatre ans. Il retrace le cas du comité scientifique et d’évaluation d’un projet pédagogique pluri-établissements démarré en 2018 dans le cadre du programme NCU-ANR-PIA d’une durée de 10 ans. Elle raconte les différents pas de la mise en place d’une évaluation instituée structurée par les statuts de ses membres, par l’adhésion à des principes sous-jacents inspirés de Thélot (2008) et inspirée par la recherche en évaluation et pas seulement par les demandes et évaluations spontanées. Elle précise les modalités de construction du jugement de l’évaluation par cett…