Search results for "Transports"

An alternative space-time meshless method for solving transient heat transfer problems with high discontinuous moving sources

2016

International audience; The aim of this work is the development of a space-time diffuse approximation meshless method (DAM) to solve heat equations containing discontinuous sources. This work is devoted to transient heat transfer problems with static and moving heat sources applied on a metallic plate and whose power presents temporal discontinuities. The space-time DAM using classical weight function is convenient for continuous transient heat transfer. Nevertheless, for problems including discontinuities, some spurious oscillations for the temperature field occur. A new weight function, respecting the principle of causality, is used to eradicate the physically unexpected oscillations.

Micron-precision in cleaving glass using ultrafast bessel beams with engineered transverse beam shapes

2017

International audience; Ultrafast lasers in association to beam shaping have shown to be excellent candidates for transparent material processing. Non-diffractive solutions such as Bessel beams allows for precise energy deposition since they are robust to undesired non-linear effects and as they do not distort along the propagation. This offers important opportunities in laser-assisted cleaving, i.e. mechanical medium separation after single-pass laser illumination. Here we break the Bessel beam cylindrical symmetry using a novel anisotropic and non-diffractive solutions to investigate both lateral intensity contributions on material response and induced processing effect for non-cylindrica…

Porous architecture and thermal properties of thermal barrier coatings deposited by suspension plasma spray

2020

Abstract Besides the intrinsic low heat transfer capability of material, the thermal insulation property of thermal barrier coatings (TBCs) also relies on their microstructures. For better understanding the relationship between process parameters, porous architecture, and thermal properties of coatings, YSZ coatings were firstly manufactured by suspension plasma spray (SPS). Afterwards their total porosities were characterized by using the technique of X-ray transmission, the nano/submicro pores in those coatings were detected with Ultra-Small Angle X-ray Scattering (USAXS), and the thermal properties of coatings were measured using the laser flash method. The results indicated that: i) the…

Membrane dynamics of sugar transports in tobacco-microbe interactions

2017

SPEINRAUBIPM DOCT; Plants can influence microorganism population through exudation of sugars notably as carbon source. Indeed, the type of plant-microorganism interaction (PMI) is linked to the trophic exchanges between plant and microorganism. Microorganisms are thus able to “manipulate” the host to modify sugar fluxes. In mycorrhizal symbiosis, the plant has a supply of nutrients by the fungal partner, which in return receives sugars. In pathogenic relationship, the microorganism will divert sugars provided by the plant without compensation. Despite identification of sugar transporters at biotrophic interfaces, molecular and cellular mechanisms by which microorganisms operate the distribu…

L'intensité nodale, une évaluation de la performance de l'intermodalité dans les pôles d'échanges

2011

National audience; L'aménagement de pôles d'échanges vise à faciliter les pratiques intermodales et à limiter les contraintes liées à la rupture de charge. Plusieurs leviers doivent être activés pour valoriser l'intermodalité : l'information multimodale, la tarification intégrée, l'aménagement fonctionnel et l'insertion urbaine sont autant d'éléments indispensables au bon fonctionnement des pôles d'échanges. Sans minimiser l'importance de ces différents aspects, cet article porte plus spécifiquement sur un autre levier tout aussi décisif pour la pratique intermodale : l'ajustement des offres de services horaires des différents opérateurs de transport public. Nous développons un indicateur é…

Les situations de handicap lors des déplacements : l’interaction des facteurs personnels et environnementaux

2015

International audience; ...

Transports aériens

1997

L'avenir est aux transports rapides, fluides et fiables. À cet égard, les transports aériens constituent un enjeu important pour les états mais aussi pour les régions et pour les villes. Or, la Franche-Comté est dotée de structures aéroportuaires témoins d'une activité aérienne significative mais qui reste locale, de loisirs, ou réservée à une clientèle d'affaires. À l'ombre des aéroports internationaux, la Franche-Comté est à ce jour peu et mal desservie par voie aérienne.

Caractériser les déplacements piétonniers dans leur environnement urbain

2010

Pull-off adhesion of hybrid glass-steel adhesive joints in salt fog environment

2016

The aim of this paper was to evaluate the durability behaviour of glass/steel adhesive joints exposed to salt fog environmental conditions for ten weeks, according to ASTM B117 standard. To this scope, pull-off mechanical tests were carried out in order to evaluate the performances evolution and damage phenomena of the adhesive joints during the ageing exposition. Two different types of adhesives were compared (i.e. epoxy and polyurethane ones). Moreover, the effects of the glass surface condition and the presence of a basalt mat layer within the adhesive thickness were evaluated. The mechanical performances were related with the occurred failure mechanisms. Epoxy-based joints showed higher…

Rīgas iedzīvotāju apmierinātība ar sabiedrisko transportu Ziepniekkalna apkaimē

2015

Bakalaura darba "Rīgas iedzīvotāju apmierinātība ar sabiedrisko transportu Ziepniekkalna apkaimē" galvenais mērķis bija izpētīt to, cik lielā mērā ar dažādiem sabiedriskā transporta aspektiem Ziepniekkalna apkaimē ir apmierināti Rīgas iedzīvotāji. Tēma tika izvēlēta, ņemot vērā to, ka sabiedriskais transports ir svarīgs elements pilsētas dzīvē, bet Ziepniekkalna apkaime robežojas ar Rīgas pilsētas robežu un tajā izbūvēts lielizmēra dzīvojamais rajons. Pētījumā tika izmantotas gan kvantitatīvās, gan kvalitatīvās metodes, kā teorētisko pamatu izmantojot mobilitātes un patērētāju apmierinātības teorijas. Ar aptaujas anketas palīdzību, kurā indivīdiem, kas izmanto sabiedrisko transportu Ziepnie…