Search results for " expérimentale"
showing 10 items of 24 documents
Using Power as a Negative Cue: How Conspiracy Mentality Affects Epistemic Trust in Sources of Historical Knowledge.
2018
Classical theories of attitude change point to the positive effect of source expertise on perceived source credibility persuasion, but there is an ongoing societal debate on the increase in anti-elitist sentiments and conspiracy theories regarding the allegedly untrustworthy power elite. In one correlational ( N = 275) and three experimental studies ( N = 195, N = 464, N = 225), we tested the novel idea that people who endorse a conspiratorial mind-set (conspiracy mentality) indeed exhibit markedly different reactions to cues of epistemic authoritativeness than those who do not: Whereas the perceived credibility of powerful sources decreased with the recipients' conspiracy mentality, that o…
Collision de similaritons optiques dans un amplificateur optique fibré Raman
2005
National audience; Nous abordons les aspects théoriques et expérimentaux de la génération et propagation de deux similaritons optiques de fréquences centrales différentes dans un amplificateur optique fibré Raman à dispersion normale. Nous observons les effets intervenant durant la collision des deux similaritons: un battement sinusoïdal apparaît dans la zone de recouvrement temporel des impulsions et des effets de la modulation de phase croisée modifient le spectre des similaritons. Les similaritons retrouvent néanmoins, après collision, leurs caractéristiques paraboliques.
Kāda līdz šim nepazīta cikliska amfībiju dzimumpazīme: vardes priekškāju skeleta sezonu variācijas
1924
Atsevišķs iespiedums no: Latvijas Universitātes Raksti, XI. 1924. Kopsavilkums franču valodā.
Détection de ruptures de fibres au sein d'un composite unidirectionnel à l'aide d'un circuit micro-onde résonant
2006
International audience; Cet article présente une méthode novatrice de controle non destructif d'endommagement dans les matériaux composites. Elle est fondée sur l'observation et l'analyse des modifications des propriétés diélectriques d'un milieu dues à un endommagement. Plus précisément, son originalité réside dans le fait que le diagnostic cherché est obtenu via un circuit résonant microbande soumis à un champ électromagnétique dans la gamme des micro ondes. Cet article démontre la faisabilité de la méthode sur la détection de la rupture des fibres d'une éprouvette en comosite unidirectionnel soumise à un effort de flexion et indique en quoi elle possède potentiellement des atouts pour et…
Contribution to the study of the recovery of wast heat : study and optimization of Stirling engines
2012
Several machines currently used, internal combustion engines for the car industry or thermal power plants in energy, exhaust a considerable amount of heat. Generally this heat is dispersed in the atmosphere and its energy lost. So we took a special interest in external heat engines which primary energy is heat energy, and more particularly in Stirling engines. One of its main characteristics is the used of energy from heat produced externally like energy source. This allows Stirling engines to be multi-fuel and even to use natural heat energy.The study carried out is made up of two parts. First, a three zones zero dimensional finite-time thermodynamic model has been developed. It takes into…
Ecologie évolutive de la malaria aviaire : approches expérimentales des relations entre Plasmodium relictum et le canari domestique
2010
Host-parasite interaction became one of the main topics of evolutionary sciences researches. One of the major issues raised by these studies is to understand why some parasites cause fatal diseases while others remain relatively mild to their hosts. In this challenge attempting to take up the evolutionary biologist and the medical sciences, we focused on avian malaria, and more specifically on its most common parasite: Plasmodium relictum. In performing experimental infections in domestic canaries (Serinus canaria), we wanted to understand what factors related to parasite and birds characteristics, could influence Plasmodium relictum virulence. We highlighted that factors such as infectious…
Vers un langage du goût : approche expérimentale d'une communication multimodale à destination des mangeurs
2014
The communication of taste is a critical point to the professional of sensory analysis and to the food industry, but also to the consumers themselves, who sometimes need a tool to help them to make their food choices. Still, the taste is complex to study, as it is the product of the three dimensions sensory/sensitive/symbolic, which is the reason why its communication is difficult to set up. The sensitive dimension is a semiotic concept based on the human dimension of perception (emotion, memory, social…), and which study its influence on the construction of meaning in a communication context. A multidisciplinary approach is needed to embrace the global nature of taste, as it refers to soci…
L'influence de l'hyperthyroidisation expérimentale sur le plumage des oiseaux carnivores: (note préliminaire) [Gaļas ēdāju putnu spalvojuma atkarība …
1931
Teksts franču valodā, kopsavilkums latviešu valodā.
Modelling of laser beam texturing process: experimental and numerical approaches
2007
The aim of this work is to reache a better control of the laser beam surface texturing process on three materials: 304L, TA6V and AA6056 alloys. For this purpose, two complementary methods, experimental and numerical modelling, have been used. As a result of the experimental design approach, it was observed that the laser surface texturing process of 304L and TA6V alloys is strongly influenced by the pulse energy and frequency. In order to obtain a surface roughness Sa < 5 µm for the highest possible productivity it is necessary to work with an energy of 5 mJ and a frequency ranging between 10 and 12 kHz. Unfortunately, for aluminium alloy AA6056, it is necessary to make a choice between ha…
Exploiter une plateforme de recherche en télécommunications optiques pour souligner la dualité temps/fréquence
2015
National audience; L’analyse de Fourier [1] tient une place majeure dans l’analyse et la compréhension de nombreux phénomènes de la physique et de l’ingénierie contemporaines. Pourtant les étudiants, qui ont souvent découvert cette notion à travers des travaux numériques ou en cours de mathématiques, ne cernent pas forcément toute la richesse qui peut être tirée de l’analyse conjointe dans les domaines temporels et spectraux, notamment dans le domaine de l’optique [2, 3]. De plus, si une grande attention est souvent accordée aux profils temporels ou spectraux en intensité, la notion de phase est souvent balayée beaucoup rapidement.Nous avons mis en place dans le cadre de la seconde année du…