ETUDE EXPERIMENTALE ET MODELISATION DU CHAUFFAGE PAR RAYONNEMENT INFRAROUGE DE POLYMERES SEMI-CRISTALLINS PDF Download
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Author: ARNAUD.. DENIS
Publisher:
ISBN:
Category :
Languages : fr
Pages : 200
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Book Description
LES TRANSFERTS THERMIQUES DANS UNE PLAQUE DE POLY(ETHYLENE TEREPHATALATE), SOUMISE A UN RAYONNEMENT INFRAROUGE, SONT ETUDIES A L'AIDE D'UN MODELE NUMERIQUE PRENANT EN COMPTE A LA FOIS LES PARAMETRES PHYSIQUES LIES A CE TYPE DE CHAUFFAGE ET CEUX LIES AU MATERIAU. LA REPARTITION SPECTRALE ET LA DENSITE DU FLUX INCIDENT, LES COEFFICIENTS DE CONVECTION, L'ABSORPTION ET LA CRISTALLINITE SONT PRIS EN COMPTE PAR LE CODE DE CALCUL. SI AU COURS DU CHAUFFAGE, LA TEMPERATURE DU MATERIAU ATTEINT LA ZONE DE TEMPERATURE DE CRISTALLISATION, IL SE DEVELOPPE ALORS DES CRISTALLITES QUI DEVIENNENT DES CENTRES DIFFUSANTS DU RAYONNEMENT. L'EVOLUTION DE LA STRUCTURE DU POLYMERE AU COURS DU CHAUFFAGE A DONC ETE ETUDIEE. ELLE A CONDUIT, EN PREMIER LIEU, A LA DETERMINATION DES CINETIQUES DE CRISTALLISATION DU POLYMERE (PAR ANALYSE ENTHALPIQUE DIFFERENTIELLE) PUIS, EN SECOND LIEU, A L'ETUDE DES VARIATIONS DES PROPRIETES OPTIQUES DU MATERIAU (PAR SPECTROPHOTOMETRIE). IL A ETE ETABLI QUE LE COEFFICIENT DE DIFFUSION NE DEPENDAIT DU TAUX DE CRISTALLINITE QUE POUR LES FAIBLES LONGUEURS D'ONDE DU RAYONNEMENT ( /2M). LA LOI DE COMPORTEMENT DU COEFFICIENT DE DIFFUSION, EN FONCTION DU TAUX DE CRISTALLINITE ET DE LA LONGUEUR D'ONDE A PERMIS, A L'AIDE DU CODE DE CALCUL, DE DETERMINER LA REPARTITION DE TEMPERATURE DANS UNE PLAQUE EPAISSE DE P.E.T. CE CODE DE CALCUL UTILISE UN MODELE A QUATRE FLUX AFIN DE TENIR COMPTE DE LA DIFFUSION DU RAYONNEMENT INCIDENT PAR LES CRISTALLITES ET DE TRAITER LE CAS D'UN MATERIAU INHOMOGENE. LES RESULTATS OBTENUS MONTRENT L'IMPORTANCE DU CHOIX DES PARAMETRES DE CHAUFFAGE SUR LA DISTRIBUTION DE TEMPERATURE A L'INTERIEUR DU POLYMERE. NOUS AVONS ETUDIE L'INFLUENCE DE LA DENSITE ET DE LA REPARTITION SPECTRALE DU FLUX INCIDENT AINSI QUE DES COEFFICIENTS DE CONVECTION ET DES CONDITIONS INITIALES. LE DEGRE DE CRISTALLINITE DU POLYMERE, AVANT CHAUFFAGE, INFLUENCE EGALEMENT LES GRADIENTS DE TEMPERATURE A L'INTERIEUR DU MATERIAU
Author: ARNAUD.. DENIS
Publisher:
ISBN:
Category :
Languages : fr
Pages : 200
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Book Description
LES TRANSFERTS THERMIQUES DANS UNE PLAQUE DE POLY(ETHYLENE TEREPHATALATE), SOUMISE A UN RAYONNEMENT INFRAROUGE, SONT ETUDIES A L'AIDE D'UN MODELE NUMERIQUE PRENANT EN COMPTE A LA FOIS LES PARAMETRES PHYSIQUES LIES A CE TYPE DE CHAUFFAGE ET CEUX LIES AU MATERIAU. LA REPARTITION SPECTRALE ET LA DENSITE DU FLUX INCIDENT, LES COEFFICIENTS DE CONVECTION, L'ABSORPTION ET LA CRISTALLINITE SONT PRIS EN COMPTE PAR LE CODE DE CALCUL. SI AU COURS DU CHAUFFAGE, LA TEMPERATURE DU MATERIAU ATTEINT LA ZONE DE TEMPERATURE DE CRISTALLISATION, IL SE DEVELOPPE ALORS DES CRISTALLITES QUI DEVIENNENT DES CENTRES DIFFUSANTS DU RAYONNEMENT. L'EVOLUTION DE LA STRUCTURE DU POLYMERE AU COURS DU CHAUFFAGE A DONC ETE ETUDIEE. ELLE A CONDUIT, EN PREMIER LIEU, A LA DETERMINATION DES CINETIQUES DE CRISTALLISATION DU POLYMERE (PAR ANALYSE ENTHALPIQUE DIFFERENTIELLE) PUIS, EN SECOND LIEU, A L'ETUDE DES VARIATIONS DES PROPRIETES OPTIQUES DU MATERIAU (PAR SPECTROPHOTOMETRIE). IL A ETE ETABLI QUE LE COEFFICIENT DE DIFFUSION NE DEPENDAIT DU TAUX DE CRISTALLINITE QUE POUR LES FAIBLES LONGUEURS D'ONDE DU RAYONNEMENT ( /2M). LA LOI DE COMPORTEMENT DU COEFFICIENT DE DIFFUSION, EN FONCTION DU TAUX DE CRISTALLINITE ET DE LA LONGUEUR D'ONDE A PERMIS, A L'AIDE DU CODE DE CALCUL, DE DETERMINER LA REPARTITION DE TEMPERATURE DANS UNE PLAQUE EPAISSE DE P.E.T. CE CODE DE CALCUL UTILISE UN MODELE A QUATRE FLUX AFIN DE TENIR COMPTE DE LA DIFFUSION DU RAYONNEMENT INCIDENT PAR LES CRISTALLITES ET DE TRAITER LE CAS D'UN MATERIAU INHOMOGENE. LES RESULTATS OBTENUS MONTRENT L'IMPORTANCE DU CHOIX DES PARAMETRES DE CHAUFFAGE SUR LA DISTRIBUTION DE TEMPERATURE A L'INTERIEUR DU POLYMERE. NOUS AVONS ETUDIE L'INFLUENCE DE LA DENSITE ET DE LA REPARTITION SPECTRALE DU FLUX INCIDENT AINSI QUE DES COEFFICIENTS DE CONVECTION ET DES CONDITIONS INITIALES. LE DEGRE DE CRISTALLINITE DU POLYMERE, AVANT CHAUFFAGE, INFLUENCE EGALEMENT LES GRADIENTS DE TEMPERATURE A L'INTERIEUR DU MATERIAU
Author: Sylvia Andrieu
Publisher:
ISBN:
Category :
Languages : fr
Pages : 209
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Book Description
Le but de l'étude est de comprendre l'interaction entre le rayonnement infrarouge et les plaques thermoplastiques lors du thermoformage. L'étape de chauffage qui se produit avant l'étape de formage au cours de ce procédé permet d'amener le polymère à la température de formage avant la déformation de la plaque au contact d'un moule. La répartition de températures joue un rôle prépondérant sur la distribution des épaisseurs de l'objet thermoformé. Les thermoformeuses sont, en général, équipées avec des fours constitués par des émetteurs céramiques (infrarouge long max = 3 μm) ou plus rarement avec des émetteurs quartz (infrarouge moyen max = 1.2 μm) qui commencent à être employées en thermoformage. Pour comprendre l'interaction entre le rayonnement infrarouge et les polymères il est donc nécessaire de caractériser les propriétés spectrales des polymères de l'étude (l'ABS, le polystyrène et le polypropylène homopolymère) en émission, absorption, et réflexion. Un enjeu majeur est de réaliser des mesures non intrusives de températures dans le polymère en mettant en œuvre une métrologie thermique. C'est pour cela que le "démonstrateur de chauffage infrarouge" a été développé dans le but de réaliser des cartographies et des mesures de gradients de températures dans l'épaisseur du polymère au cours du chauffage. Ainsi les cartographies d'éclairements et de températures mesurées ont permis de valider le modèle thermique développé. Ce modèle est basé sur une méthode de lancer de rayons pour calculer l'éclairement dans le but de s'apparenter à la physique du rayonnement et ainsi de prendre en compte les réflecteurs des émetteurs qui peuvent être de géométrie complexes. Un couplage à l'approximation de Rosseland qui permet de prendre en compte le terme source et une diffusion 3D permet d'aboutir au calcul des températures du polymère au cours du chauffage.
Author: Ahmed Belasri
Publisher: Springer Nature
ISBN: 9811554447
Category : Technology & Engineering
Languages : en
Pages : 659
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Book Description
This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Author: Bo Song
Publisher: Springer
ISBN: 3319224522
Category : Technology & Engineering
Languages : en
Pages : 265
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Book Description
Dynamic Behavior of Materials, Volume 1 represents the first of nine volumes of technical papers presented at the Society for Experimental Mechanics SEM 15th International Congress & Exposition on Experimental and Applied Mechanics, held at Costa Mesa, California, June 8-11, 2015. The full set of proceedings also includes volumes on: Challenges in Mechanics of Time Dependent Materials, Advancement of Optical Methods in Experimental Mechanics, Experimental and Applied Mechanics 16th International Symposium on MEMS and Nanotechnology, 5th International Symposium on the Mechanics of Biological Systems and Materials, International Symposium on the Mechanics of Composite and Multi-functional Materials, Fracture, Fatigue, Failure and Damage Evolution; and Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems.
Author: International Atomic Energy Agency
Publisher: International Atomic Energy Agency
ISBN: 9789201063205
Category : Technology & Engineering
Languages : en
Pages : 72
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Book Description
This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.
Author: Sébastien Forget
Publisher: Springer
ISBN: 3642367054
Category : Science
Languages : en
Pages : 179
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Book Description
Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.
Author: Rob Flickenger
Publisher: "O'Reilly Media, Inc."
ISBN: 9780596005023
Category : Computers
Languages : en
Pages : 190
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Book Description
Building Wireless Community Networks is about getting people online using wireless network technology. The 802.11b standard (also known as WiFi) makes it possible to network towns, schools, neighborhoods, small business, and almost any kind of organization. All that's required is a willingness to cooperate and share resources. The first edition of this book helped thousands of people engage in community networking activities. At the time, it was impossible to predict how quickly and thoroughly WiFi would penetrate the marketplace. Today, with WiFi-enabled computers almost as common as Ethernet, it makes even more sense to take the next step and network your community using nothing but freely available radio spectrum. This book has showed many people how to make their network available, even from the park bench, how to extend high-speed Internet access into the many areas not served by DSL and cable providers, and how to build working communities and a shared though intangible network. All that's required to create an access point for high-speed Internet connection is a gateway or base station. Once that is set up, any computer with a wireless card can log onto the network and share its resources. Rob Flickenger built such a network in northern California, and continues to participate in network-building efforts. His nuts-and-bolts guide covers: Selecting the appropriate equipment Finding antenna sites, and building and installing antennas Protecting your network from inappropriate access New network monitoring tools and techniques (new) Regulations affecting wireless deployment (new) IP network administration, including DNS and IP Tunneling (new) His expertise, as well as his sense of humor and enthusiasm for the topic, makes Building Wireless Community Networks a very useful and readable book for anyone interested in wireless connectivity.
Author: Marta Peris-Ortiz
Publisher: Springer
ISBN: 3319188577
Category : Business & Economics
Languages : en
Pages : 280
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Book Description
The aim of this book is to show how wine tourism can be used as a model for sustainable economic development, driving economic growth and social development in some locations. It will explore the interaction between tourism and viticulture in wine tourism destinations, while also explaining some of the repercussions of these activities. This book covers various topics including regional development, environmental management, sustainable viticulture, quality management in wineries and wine tourism routes among others. Wine tourism, which combines two important yet distinct economic activities (i.e., tourism and viticulture), has recently emerged as a new tourism product driven by tourists’ search for new experiences and wineries’ need to diversify their businesses and seek new revenue streams to boost sales. This new form of tourism, which typically takes place in rural areas and which combines wine production with tourist activities, is becoming important for such regions by providing a complementary income source. It provides a model for sustainable economic development for these regions, which for various reasons may otherwise struggle to develop. Featuring cases and business implications from various locations, this book provides an important source of knowledge—both theoretical and practical—suitable to academics, scholars, researchers, and practitioners in the tourism sector and the wine industry.
Author: Fabien Bretenaker
Publisher: World Scientific
ISBN: 9814612421
Category : Science
Languages : en
Pages : 185
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Book Description
This unique book provides an overview of the principle and applications of lasers enriched with numerous illustrations.Being over fifty years old, lasers continue to amaze us. Their performance characteristics are constantly reaching new limits, and the scope of their applications continues to expand. Yet, it took years of effort by teams of physicists to transform the fundamental notions of Einstein into the first experimental beam of laser light. And history is still going on as fundamental research is now triggered by its remarkable properties.This book addresses every aspects of laser light, from its fundamental principles to its industrial applications, at a level particularly suited for high school teachers, students, and anybody curious about science and technology.
Author: Rob Flickenger
Publisher: "O'Reilly Media, Inc."
ISBN: 9780596005597
Category : Computers
Languages : en
Pages : 310
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Book Description
Continuing with the successful Hack Series, this title provides real-world working examples of how to make useful things happen with wireless equipment.
