Search results for "virtu"
showing 10 items of 1987 documents
GRID STABILITY IMPROVEMENT BY RES-BASED GENERATORS AND BATTERY ENERGY STORAGE SYSTEMS IN SMALL ISLANDS
2021
The integration of Renewable Energy Sources (RES) with power electronics interface to the grid, without the back-up of rotating inertia, endangers frequency stability. This issue becomes particularly critical in isolated power systems, like those of small islands not supplied by the main grid, in the case of high shares of production from unpredictable renewables such as photovoltaic and wind sources. Consequently, to preserve the security and the reliability of these systems, it is necessary to adopt new frequency adjustments mechanisms. In this context, the thesis investigates the transition toward an economically and technically feasible generating system based on RES, to achieve specifi…
Coloscopie virtuelle — par tomodensitométrie (CTDM) et résonance magnétique (CRM) — dans la détection des polypes coliques et des lésions néoplasiques
2005
Tant chez l’homme que chez la femme, le cancer colorectal (CCR) constitue la deuxieme cause de deces dans les pays occidentaux. Par consequent, le depistage du cancer colorectal et de ses precurseurs est un important probleme de sante publique. L’utilisation de la coloscopie par tomodensitometrie computee (CTDM) et par resonance magnetique (CRM), mieux connue sous l’appellation coloscopie virtuelle, rencontre un succes populaire croissant. Le present article a pour but de passer en revue les donnees de la litterature, d’etablir l’etat actuel de la coloscopie virtuelle, et de predire son impact potentiel sur la pratique actuelle et future en gastro-enterologie.
Psychometric Comparisons of Benevolent and Corrective Humor across 22 Countries: The Virtue Gap in Humor Goes International
2018
Recently, two instances of virtue-related humor: benevolent and corrective, have been introduced. Benevolent humor treats human weaknesses and wrongdoings benevolently, while corrective humor aims at correcting and bettering them. Twelve marker items for benevolent and corrective humor (BenCor) were developed, and it was demonstrated that they fill the gap between humor as temperament and virtue. The present study investigates responses to the BenCor from 25 samples in 22 countries (overall N = 7, 226). The psychometric properties of the BenCor were found to be sufficient in most of the samples, including internal consistency, unidimensionality, and factorial validity. Importantly, benevole…
Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS
2019
Hadron leptoproduction in Semi-Inclusive measurements of Deep-Inelastic Scattering (SIDIS) on unpolarised nucleons allows one to get information on the intrinsic transverse momentum of quarks in a nucleon and on the Boer-Mulders function through the measurement of azimuthal modulations in the cross section. These modulations were recently measured by the HERMES experiment at DESY on proton and deuteron targets, and by the COMPASS experiment using the CERN SPS muon beam and a $^6$LiD target. In both cases, the amplitudes of the $\cos\phi_h$ and $\cos 2\phi_h$ modulations show strong kinematic dependences for both positive and negative hadrons. It has been known since some time that the measu…
The discovery of new inhibitors of HIF-1 transcriptional activity by virtual screening
2010
A comparative analysis of two immersive virtual reality systems in the integration and visualization of natural hand interaction
2022
AbstractIt is generally accepted that the use of natural interaction provides a positive impact in Virtual Reality (VR) applications. Therefore, it is important to understand what is the best way to integrate and visualize this feature in VR. For this reason, this paper presents a comparative study of the integration of natural hand interaction in two immersive VR systems: a Cave Audio Visual Experience (CAVE) system –where users’ real hands are visible– and a non-see-through Head-Mounted Display (HMD) system –where only a virtual representation of the hands is possible–. In order to test the suitability of using this type of interaction in a CAVE and compare it to an HMD, we raise six rese…
Roolit hajautettujen tiimien verkkokokouksissa
2013
Tämän pro gradu -tutkielman tavoitteena oli kuvata millaisia rooleja hajautettujen tiimien verkkokokouksissa ilmenee ja tarkastella mittkä roolit korostuvat ja mitkä jäävät taka-alalle virtuaalisen ryhmän vuorovaikutuksessa. Tutkittavaa ilmiötä lähestyttiin käyttämällä aineistonkeruussa systemaattista havainnointia. Tutkielmassa havainnoitiin Connect Pro -verkkokokoussovellusta käyttäviä työryhmiä. Havainnoitava aineisto koostui viidestä verkkokokoustallenteesta. Tuloksissa käy ilmi, että verkkokokouksessa joitakin rooleja ilmenee useammin kuin kasvokkain tapaavan ryhmän toiminnassa. Näitä ovat muun muassa etsijä, rohkaisija ja portinvartija. Jotkut roolit muuttuvat ja niihin voidaan liittä…
The affect of contact force sensations on user performance in virtual assembly tasks
2007
International audience; Abstract The development of a realistic virtual assemblyenvironment is challenging because of the complexity of the physical processes and the limitation of available VRtechnology. Many research activities in this domain pri-marily focused on particular aspects of the assembly task such as the feasibility of assembly operations in terms of interference between the manipulated parts. The virtualassembly environment reported in this research is focusedon mechanical part assembly. The approach presented ad-dresses the problem of part-to-part contacts during themating phase of assembly tasks. The system describedcalculates contact force sensations by making their inten-s…
New developments in simulation-based harbour crane training
2011
This paper presents the efforts that have been made during the development of a set of harbour training simulators to improve their quality. The paper focuses on two main research lines: the improvement of complex physical systems involved in the simulation and the analysis of hardware architecture solutions. Cable-based hoist systems and bulk materials are systems present in different harbour equipment and are usually simulated with poor quality due to their complexity. In this paper physics-based models for the interactive simulation of these systems are proposed and applied to real cases. Also, different hardware simulator architectures are analysed and different approaches are proposed …
<title>Managing compressed multimedia data in a memory hierarchy: fundamental issues and basic solutions</title>
1998
The purpose of the work is to discuss the fundamental issues and solutions in managing compressed and uncompressed multimedia data, especially voluminous continuous mediatypes (video, audio) and text in a memory hierarchy with four levels (main memory, magnetic disk, (optical or magnetic) on-line/near-line low-speed memory, and slow off-line memory, i.e. archive). We view the multimedia data in such a database to be generated, (compressed), and stored into the memory hierarchy (at the lowest non-archiving level), and subsequently retrieved, (decompressed), and presented. If unused, the data either travels down in the memory hierarchy or it is compressed and stored at the same level. We firs…