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Author: Jean Lescure
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
CETTE ETUDE CONCERNE LA MISE AU POINT D'UNE METHODE BIDIMENSIONNELLE DE CONCENTRATION EN MELANGE GAZEUX. ELLE EST BASEE SUR LA VISUALISATION PAR TOMOGRAPHIE LASER ET SUR LA MESURE DE LA DIFFUSION MIE PAR LES PARTICULES ENSEMENCEES DANS UN GAZ. UN SYSTEME D'ACQUISITION ET DE TRAITEMENT D'IMAGES PERMET DE RECONSTITUER LE CHAMP DE CONCENTRATION D'UN GAZ AU COURS DE SON MELANGE AVEC UN AUTRE. CETTE METHODE A ETE UTILISEE POUR MESURER LE CHAMP DE CONCENTRATION DANS UN JET LIBRE AIR DANS AIR. LES COEFFICIENTS DES LOIS DESCRIPTIVES DU JET ONT ETE COMPARES A DIVERSES PUBLICATIONS. L'ENSEMBLE DES RESULTATS EST SATISFAISANT MALGRE LA DISPERSION DES RESULTATS D'UN AUTEUR A L'AUTRE. NOUS AVONS MESURE LE CHAMP DE VITESSE (TUBE DE PITOT) POUR ACCEDER A LA QUANTITE DE MOUVEMENT ET AUX FLUX DE MASSE INJECTEE. LA CONSERVATION DE CES GRANDEURS NOUS A PERMIS DE VALIDER LES LOIS DU JET ET DE PROPOSER DES RELATIONS ENTRE LES DIFFERENTS COEFFICIENTS. CETTE METHODE DE MESURE A ETE DEVELOPPEE DANS L'INTENTION D'ANALYSER LA PREPARATION DU MELANGE DANS UN MOTEUR A COMBUSTION INTERNE
Author: Jean Lescure
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
CETTE ETUDE CONCERNE LA MISE AU POINT D'UNE METHODE BIDIMENSIONNELLE DE CONCENTRATION EN MELANGE GAZEUX. ELLE EST BASEE SUR LA VISUALISATION PAR TOMOGRAPHIE LASER ET SUR LA MESURE DE LA DIFFUSION MIE PAR LES PARTICULES ENSEMENCEES DANS UN GAZ. UN SYSTEME D'ACQUISITION ET DE TRAITEMENT D'IMAGES PERMET DE RECONSTITUER LE CHAMP DE CONCENTRATION D'UN GAZ AU COURS DE SON MELANGE AVEC UN AUTRE. CETTE METHODE A ETE UTILISEE POUR MESURER LE CHAMP DE CONCENTRATION DANS UN JET LIBRE AIR DANS AIR. LES COEFFICIENTS DES LOIS DESCRIPTIVES DU JET ONT ETE COMPARES A DIVERSES PUBLICATIONS. L'ENSEMBLE DES RESULTATS EST SATISFAISANT MALGRE LA DISPERSION DES RESULTATS D'UN AUTEUR A L'AUTRE. NOUS AVONS MESURE LE CHAMP DE VITESSE (TUBE DE PITOT) POUR ACCEDER A LA QUANTITE DE MOUVEMENT ET AUX FLUX DE MASSE INJECTEE. LA CONSERVATION DE CES GRANDEURS NOUS A PERMIS DE VALIDER LES LOIS DU JET ET DE PROPOSER DES RELATIONS ENTRE LES DIFFERENTS COEFFICIENTS. CETTE METHODE DE MESURE A ETE DEVELOPPEE DANS L'INTENTION D'ANALYSER LA PREPARATION DU MELANGE DANS UN MOTEUR A COMBUSTION INTERNE
Author: MARTIAL.. DURGET
Publisher:
ISBN:
Category :
Languages : fr
Pages : 254
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Book Description
L'OBJET DE L'ETUDE EST DE MESURER DES CHAMPS DE CONCENTRATIONS DANS DES ECOULEMENTS INTERNES, DU TYPE DE CEUX RENCONTRES DANS LES MACHINES ALTERNATIVES. POUR CELA, NOUS AVONS DU DEVELOPPER UNE METHODE DE MESURE, APPLIQUEE ICI A L'ETUDE DES MOTEURS A COMBUSTION INTERNE EN FONCTIONNEMENT. CE GENRE D'INVESTIGATION S'ADRESSE PAR CONSEQUENT A DES ECOULEMENTS TRES COMPLEXES QUI NE DOIVENT PAS ETRE PERTURBES PAR LA MESURE. LA METHODE QUE NOUS AVONS CHOISIE EST LA TOMOGRAPHIE LASER, PAR DIFFUSION MIE. CETTE TECHNIQUE CONSISTE A ILLUMINER, A L'AIDE D'UNE NAPPE LASER PLANE TRES FINE, UN MELANGE GAZEUX DONT UNE ESPECE EST PREALABLEMENT ENSEMENCEE EN PARTICULES. EN PRENANT CERTAINES PRECAUTIONS, IL EST ALORS POSSIBLE, EN ANALYSANT LE FLUX LUMINEUX DIFFUSE PAR CES PARTICULES, DE CONNAITRE LA CONCENTRATION MOLAIRE DE L'ESPECE ETUDIEE. BIEN QUE CETTE TECHNIQUE AIT PRESENTE DANS UN PREMIER TEMPS D'EXCELLENTES APTITUDES DANS DES CONFIGURATIONS EXPERIMENTALES SIMPLES, TELLES QUE L'ETUDE DE MELANGE DE JETS (LIBRES OU CONFINES) EN REGIME STATIONNAIRE ISOTHERME ET ISOBARE, NOUS AVONS ETE AMENES A ANALYSER PLUS EN DETAIL LE REEL POTENTIEL DE CET OUTIL. EN PARTICULIER, NOUS FAISONS UNE APPROCHE THEORIQUE DE L'INFLUENCE DES GRADIENTS DE PRESSION ET DE TEMPERATURE PRESENTS DANS LE VOLUME DE MESURE, AINSI QUE DE LA PRESENCE DE REFLEXIONS DE PAROIS, SUR LA QUALITE DU SIGNAL. UNE ANALYSE CONCERNANT LA NATURE DU TRACEUR UTILISE EST EGALEMENT REALISEE. UN TRAITEMENT STATISTIQUE DES IMAGES EN DECOULE. ENFIN, NOUS ILLUSTRONS LES RESULTATS QU'IL EST POSSIBLE D'OBTENIR PAR L'ETUDE LA PHASE D'ADMISSION D'UN MOTEUR A QUATRE TEMPS, A ALLUMAGE COMMANDE. L'EVOLUTION DU CHAMP DE CONCENTRATION EN CHARGE FRAICHE, A L'INTERIEUR MEME DU CYLINDRE, EST PRESENTEE ET ANALYSEE
Author: Franz Mayinger
Publisher: Springer Science & Business Media
ISBN: 3662029677
Category : Science
Languages : en
Pages : 462
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Book Description
Increasing possibilities of computer-aided data processing have caused a new revival of optical techniques in many areas of mechanical and chemical en gineering. Optical methods have a long tradition in heat and mass transfer and in fluid dynamics. Global experimental information is not sufficient for developing constitution equations to describe complicated phenomena in fluid dynamics or in transfer processes by a computer program . Furthermore, a detailed insight with high local and temporal resolution into the thermo-and fluiddynamic situations is necessary. Sets of equations for computer program in thermo dynamics and fluid dynamics usually consist of two types of formulations: a first one derived from the conservation laws for mass, energy and momentum, and a second one mathematically modelling transport processes like laminar or turbulent diffusion. For reliably predicting the heat transfer, for example, the velocity and temperature field in the boundary layer must be known, or a physically realistic and widely valid correlation describing the turbulence must be avail able. For a better understanding of combustion processes it is necessary to know the local concentration and temperature just ahead of the flame and in the ignition zone.
Author: Mark E. Brezinski
Publisher: Elsevier
ISBN: 0080464947
Category : Science
Languages : en
Pages : 645
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Book Description
Optical Coherence Tomography gives a broad treatment of the subject which will include 1)the optics, science, and physics needed to understand the technology 2) a description of applications with a critical look at how the technology will successfully address actual clinical need, and 3) a discussion of delivery of OCT to the patient, FDA approval and comparisons with available competing technologies. The required mathematical rigor will be present where needed but be presented in such a way that it will not prevent non-scientists and non-engineers from gaining a basic understanding of OCT and the applications as well as the issues of bringing the technology to the market. - Optical Coherence Tomography is a new medical high-resolution imaging technology which offers distinct advantages over current medical imaging technologies and is attracting a large number of researchers. - Provides non-scientists and non-engineers basic understanding of Optical Coherence Tomography applications and issues.
Author: M.A. Rao
Publisher: CRC Press
ISBN: 1420028804
Category : Technology & Engineering
Languages : en
Pages : 762
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Book Description
Ten years have passed since this reference's last edition - making Engineering Properties of Foods, Third Edition the must-have resource for those interested in food properties and their variations. Defined are food properties and the necessary theoretical background for each. Also evaluated is the usefulness of each property i
Author: Heinz W. Siesler
Publisher: John Wiley & Sons
ISBN: 352761267X
Category : Science
Languages : en
Pages : 361
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Book Description
Over the last few years, near-infrared (NIR) spectroscopy has rapidly developed into an important and extremely useful method of analysis. In fact, for certain research areas and applications, ranging from material science via chemistry to life sciences, it has become an indispensable tool because this fast and cost-effective type of spectroscopy provides qualitative and quantitative information not available from any other technique. This book offers a balanced overview of the fundamental theory and instrumentation of NIR spectroscopy, introducing the material in a readily comprehensible manner. A considerable part of the text is dedicated to practical applications, including sample preparation and investigations of polymers, textiles, drugs, food and animal feed. However, special topics, such as two-dimensional correlation analysis, are also covered in separate chapters. Written by eight experts in different fields, this book presents an introduction to the current state of developments and is valuable to spectroscopists and to practitioners applying NIR spectroscopy as a daily analytical tool.
Author: Chris Guy
Publisher:
ISBN: 9781860945021
Category : Medical
Languages : en
Pages : 374
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Book Description
- Covers the entire field of medical imaging at an introductory level - Provides a brief description of the clinical context of imaging for students with an engineering background - Provides a descriptive, non-mathematical background to the physics underpinning imaging for students with a medical background - Includes exercises and problems at the end of every chapter to test readers' understanding of the material
Author: Frank Pobell
Publisher: Springer Science & Business Media
ISBN: 366208578X
Category : Science
Languages : en
Pages : 328
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Book Description
The aim of this book is to provide information about performing experi ments at low temperatures, as well as basic facts concerning the low tem perature properties of liquid and solid matter. To orient the reader, I begin with chapters on these low temperature properties. The major part of the book is then devoted to refrigeration techniques and to the physics on which they are based. Of equal importance, of course, are the definition and measurement of temperature; hence low temperature thermometry is extensively discussed in subsequent chapters. Finally, I describe a variety of design and construction techniques which have turned out to be useful over the years. The content of the book is based on the three-hour-per-week lecture course which I have given several times at the University of Bayreuth between 1983 and 1991. It should be particularly suited for advanced stu dents whose intended masters (diploma) or Ph.D. subject is experimental condensed matter physics at low temperatures. However, I believe that the book will also be of value to experienced scientists, since it describes sev eral very recent advances in experimental low temperature physics and technology, for example, new developments in nuclear refrigeration and thermometry.
Author:
Publisher:
ISBN:
Category : Canada
Languages : en
Pages : 862
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Book Description
Author: Andreas Kirsch
Publisher: Springer Science & Business Media
ISBN: 1441984747
Category : Mathematics
Languages : en
Pages : 314
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Book Description
This book introduces the reader to the area of inverse problems. The study of inverse problems is of vital interest to many areas of science and technology such as geophysical exploration, system identification, nondestructive testing and ultrasonic tomography. The aim of this book is twofold: in the first part, the reader is exposed to the basic notions and difficulties encountered with ill-posed problems. Basic properties of regularization methods for linear ill-posed problems are studied by means of several simple analytical and numerical examples. The second part of the book presents two special nonlinear inverse problems in detail - the inverse spectral problem and the inverse scattering problem. The corresponding direct problems are studied with respect to existence, uniqueness and continuous dependence on parameters. Then some theoretical results as well as numerical procedures for the inverse problems are discussed. The choice of material and its presentation in the book are new, thus making it particularly suitable for graduate students. Basic knowledge of real analysis is assumed. In this new edition, the Factorization Method is included as one of the prominent members in this monograph. Since the Factorization Method is particularly simple for the problem of EIT and this field has attracted a lot of attention during the past decade a chapter on EIT has been added in this monograph as Chapter 5 while the chapter on inverse scattering theory is now Chapter 6.The main changes of this second edition compared to the first edition concern only Chapters 5 and 6 and the Appendix A. Chapter 5 introduces the reader to the inverse problem of electrical impedance tomography.
