Search results for "Transports"
showing 10 items of 485 documents
Arc routing problems with drones
2023
La tecnología emergente de vehículos aéreos no tripulados, comúnmente conocidos como drones, ha brindado nuevas oportunidades para los profesionales de la logística urbana en la última década. El transporte ha jugado siempre un papel crucial en la sociedad y en la economía, y un motor fundamental del desarrollo económico en los últimos tiempos ha sido la inversión en sistemas de transporte cada vez más eficientes. Los drones presentan ventajas atractivas en comparación con los vehículos terrestres estándar, como evitar la congestión en las redes viales, eliminar el riesgo del personal en operaciones de difícil acceso u obtener una mayor precisión de medición en la inspección de infraestruct…
Fibre break failure processes in unidirectional composites: evaluation of critical damage states
2016
Earlier work which successfully modelled the kinetics of fibre breakage in unidirectional composites under monotonic tensile loading has been extended to quantify the kinetics of fibre failure during both monotonic and sustained tensile loading. In both cases, failure was seen to occur when a critical density of large clusters (more than 16 fibres are broken within the representative volume element) of fibre breaks developed. However, in monotonic loading failure occurred very quickly after the first development of these large clusters, whereas under sustained loading the composite could accommodate greater levels of large clusters because of the lower applied load. This article is part of …
Dzelzceļa ritošā sastāva radīto emisiju atmosfērā matemātisko novērtēšanas metožu salīdzinošā analīze
2018
Maģistra darbā veikta dzelzceļa transporta (kravas dīzeļlokomotīvju, pasažieru dīzeļvilcienu un elektrovilcienu) analīze un inventarizācija pēc to tehniskās specifikācijas, enerģijas patēriņa un gaisa piesārņojošo vielu emisijām. Izvērtētas Starptautiskās dzelzceļu savienības un Eiropas Vides aģentūras emisiju novērtēšanas aprēķina metodes, kuras metodoloģiski ir līdzīgas (tiek izmantoti emisiju faktori un degvielas patēriņa rādītāji), taču sniedz atšķirīgus rezultātus. Darba rezultāti liecina, ka UIC metode ir piemērotāka dzelzceļa ritošā sastāva emisiju novērtēšanai augstākas detalizācijas pakāpes dēļ. Balstoties uz UIC metodiku un emisiju faktoriem, izstrādāts emisiju kalkulators kravas …
An implicit mesh discontinuous Galerkin formulation for higher-order plate theories
2019
In this work, a discontinuous Galerkin formulation for higher-order plate theories is presented. The starting point of the formulation is the strong form of the governing equations, which are derived in the context of the Generalized Unified Formulation and the Equivalent Single Layer approach from the Principle of Virtual Displacements. To express the problem within the discontinuous Galerkin framework, an auxiliary flux variable is introduced and the governing equations are rewritten as a system of first-order partial differential equations, which are weakly stated over each mesh element. The link among neighboring mesh elements is then retrieved by introducing suitably defined numerical …
La construction d'une grande infrastructure de transport et ses premiers effets territoriaux ; le cas de l'autoroute A39, section Dôle-Bourg-Bresse
2002
ACL; International audience
Improvement of the technological process of carbonated spring water by implementing the quality and food safety management standards
2019
Bottled spring water must be health providing, clean, without microorganisms, parasites or substances. The design, manufacturing and management of processes, related to spring water bottling involves controlling the safety issues that may arise in the production processes. These aspects are not sufficient to prevent hazards and they must be related to the implementation of a quality and food safety systems. The aim of the paper is to improve the technological process of carbonated spring water in Monopolis S.A Company, by implementing the quality and food safety management standards. The methodology is based on the implementation requirements of the HACCP principles, included in ISO 22000 s…
Les défis de la gouvernance urbaine à Manille
2014
La région capitale des Philippines est une des plus grandes aires urbaines du monde en termes de population. Le périmètre officiel du Grand Manille (17 municipalités) abrite environ 12 millions d’habitants et l’expansion périmétropolitaine porte le chiffre réel de Manille à 15 ou 16 millions d’habitants.La rapide croissance de l’aire urbaine depuis les années 1960 a conduit à de gros problèmes de gestion du logement, de la circulation, des déchets et des risques d’inondation, entre autres. Les phénomènes sont interdépendants.Créée sous Ferdinand Marcos, la National Capital Region fut gérée par son épouse Imelda Marcos, gouverneure du Grand Manille. Après la chute de la dictature, une volont…
Vitesse, accessibilité et étalement urbain ; analyse et application à l'aire urbaine dijonnaise
2003
The set of themes of the city is approached primarily by the means of the residential density. This concept is analyzed from a purely conceptual point of view, then more theoretical (thus making use of rather traditional econometric models: Clark, Newling) for finally being applied to the agglomeration dijonnaise like with its urban surface. One releases the great urban structures thus revealing an intermediate city between the model monocentric and polycentric. The two components are analyzed successively starting from the concept of residential density. Taking as assumption that the cities are dynamic, the second stage is that of urban sprawl out. A first introductory approach attempts to…
Simulation of Fatigue Delamination Growth in Composites with Different Mode Mixtures
2007
A numerical model, obtained by implementing a cyclic damage model in the framework of an interface element, is here proposed to reproduce the crack growth in laminated composites subjected to cyclically repeated loads. This model, which differs from the few studies in the literature on the topic, applies not only to single fracture modes but also to mixed modes, and to constant or variable crack growth rates. The applied load (in terms of force or displacement) is assumed to oscillate between a minimum and a maximum constant value. The Paris curve can be reproduced with accuracy once some parameters in the numerical model are tuned with experiments. These parameters are preliminarily found…
A Study of Osmosis Rate Through Several Proton Conducting Polymer Composite Membranes
2021
Carbon dioxide is typically considered to be a byproduct of various industrial processes that should not be released into the environment due to its nature as a harmful greenhouse gas. One of the more promising ways to dispose of it in an economical and environmentally friendly way is by using it as a raw material in electrochemical synthesis reactors. An important part of such reactors is an ion exchange membrane. In this study the influence of ZrO2 content in SPEEK – ZrO2 composite membranes on rate of osmosis trough them was investigated, with the goal of evaluating ZrO2 as an additive for making ion exchange membranes with fine-tuned osmotic permeability.