Exploitation de l'etat de polarisation d'une onde diffractee en vue de la qualification et de la reconnaissance de cibles PDF Download

Author: Laurent Desclos
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0

View

Book Description

Author:
Publisher:
ISBN:
Category : Telecommunication
Languages : en
Pages : 312

View

Book Description

Author: François Bréhat
Publisher: Editions Publibook
ISBN: 2748302168
Category :
Languages : fr
Pages : 248

View

Book Description

Author: NGUYEN PHU XUAN.
Publisher:
ISBN:
Category :
Languages : fr
Pages : 165

View

Book Description
ETUDE DANS UN MILIEU NON LINEAIRE DE L'EVOLUTION DE L'ETAT DE POLARISATION D'UNE ONDE ELECTROMAGNETIQUE INTENSE DANS UNE LARGE GAMME DE PUISSANCE DE CETTE ONDE (POUVOIR ROTATOIRE AUTO-INDUIT, MESURE DU TENSEUR DE SUSCEPTIBILITE NON LINEAIRE D'ORDRE 3, PHENOMENES D'AUTOFOCALISATION ET D'EMISSION RAMAN STIMULEE). STABILITE DES ETATS DE POLARISATION DANS LES MILIEUX LINEAIRES ET NON LINEAIRES. PROPAGATION D'UNE SEULE ONDE INTENSE DANS UN MILIEU NON LINEAIRE (CONTRIBUTION A LA GENERALISATION DE LA FORMULE DE L'INDICE NON LINEAIRE DE REFRACTION, AU PHENOMENE DU POUVOIR ROTATOIRE AUTO-INDUIT, A L'ETUDE DES ETATS DE POLARISATION STABLES DANS LE PHENOMENE D'AUTOFOCALISATION). ETUDE EXPERIMENTALE DE L'INFLUENCE DES ETATS DE POLARISATION DE L'ONDE EXCITATRICE SUR LE SEUIL RAMAN. L'OBSERVATION DE L'ETAT DE POLARISATION AU VOISINAGE DU SEUIL RAMAN REVELE L'INFLUENCE MUTUELLE DES 2 PHENOMENES: AUTOFOCALISATION ET EMISSION RAMAN STIMULEE.

Author: LAURENT.. CHALLE
Publisher:
ISBN:
Category :
Languages : fr
Pages : 170

View

Book Description
CLASSIQUEMENT, LES RADARS ACTUELS SONT DE TYPE SCALAIRE PUISQUE L'INFORMATION RECUE EST TRAITEE SOUS FORME DE PUISSANCE RETRODIFFUSEE PAR UNE CIBLE. EN PARTANT DU PRINCIPE QU'UNE ONDE ELECTROMAGNETIQUE EST UNE GRANDEUR VECTORIELLE CAR ELLE EST POLARISEE, G. SINCLAIR A DONNE NAISSANCE AU DEBUT DES ANNEES 50 A UNE NOUVELLE THEORIE DE LA PHYSIQUE DU RADAR, LA POLARIMETRIE RADAR, EN MONTRANT QUE L'INTERACTION D'UNE ONDE AVEC UNE CIBLE MODIFIE L'ETAT DE POLARISATION DE CETTE ONDE. NOTRE ETUDE SE SITUANT DANS LE CADRE D'UNE CIBLE EN VISIBILITE D'UN SYSTEME RADAR, LES EFFETS DES TRAJETS MULTIPLES NE PEUVENT PAS ETRE NEGLIGES LORS DE LA PROPAGATION DES ONDES AU-DESSUS D'UNE SURFACE TERRESTRE. AINSI, UNE MODELISATION DU MILIEU DE PROPAGATION S'AVERE NECESSAIRE POUR EXPRIMER LA MATRICE POLARIMETRIQUE DES TENSIONS RECUES PAR LE SYSTEME RADAR EN FONCTION DES DIFFERENTS TRAJETS. CETTE MATRICE CONTIENT L'INFORMATION DUE A LA CIBLE ET DUE AUX EFFETS DES TRAJETS MULTIPLES VENANT ALTERER LA MATRICE DE RETRODIFFUSION DE LA CIBLE. L'OBJECTIF DE CE TRAVAIL ETANT D'EXTRAIRE LES CARACTERISTIQUES SPECIFIQUES A LA CIBLE EN VUE DE L'IDENTIFIER, DIVERSES APPROCHES POLARIMETRIQUES SONT PROPOSEES POUR DEUX APPLICATIONS DISTINCTES. LA PREMIERE APPLICATION CONCERNE LE RADAR M.O.S.A.R. (MAQUETTE ORIENTEE POUR UN SYSTEME D'ANALYSE DE RESONANCES) QUI A LA PARTICULARITE D'ETRE UN RADAR VECTORIEL TRAVAILLANT DANS LA GAMME DE FREQUENCE 30-100 MHZ. L'INTERET DES BASSES FREQUENCES RADAR EST JUSTIFIE PAR LA LUTTE CONTRE LA FURTIVITE CROISSANTE DES CIBLES. LA SECONDE APPLICATION MONTRE LES LIMITES D'IDENTIFICATION D'UN CONTRIBUTEUR ELEMENTAIRE (SPHERE, HELICE) D'UNE CIBLE SITUEE DANS SON MILIEU NATUREL ECLAIRE PAR UN RADAR VECTORIEL DE VEILLE MARITIME OPERANT EN BANDE X

Author: Simon Denny
Publisher:
ISBN: 9788867490714
Category : Art
Languages : en
Pages : 0

View

Book Description
"Simon Denny's new body of work for Portikus ranks among the most ambitious the artist has developed to date. Over the period of one year, the artist researched and developed an intricate project that has grown to considerable dimensions -- both physically and in terms of its critical content. For two months, the monumental gallery space is turned into an homage to technology, communication, and the relentless need for innovation. Simon Denny has produced an embracing and multi-faceted installation that functions as a documentary of the South Korean technology giant Samsung and its global success story. The exhibition's title, "New Management", refers to the legendary management philosophy that Lee Kun-hee, Chairman of the Samsung Group, infamously introduced in the early nineties."--Publisher's website.

Author: Catherine Malabou
Publisher: SUNY Press
ISBN: 1438439555
Category : Philosophy
Languages : en
Pages : 373

View

Book Description
Elaborates the author’s conception of plasticity by proposing a new way of thinking through Heidegger’s writings on change.

Author: Boris Groys
Publisher: Verso Books
ISBN: 178478348X
Category : Art
Languages : en
Pages : 211

View

Book Description
In the early 20th century, art and its institutions came under critique from a new democratic and egalitarian spirit. In an age of secularism and materialism, artworks would be understood as merely things among other things. This meant an attack on the techniques of realism, and the traditional mission of the museum, both designed shield a small class of objects from the entropic fate awaiting everything else-and the development of an approach that Boris Groys calls "direct realism": an art that would not produce objects, but practices that could enter the flow of time to live and die like the rest of us. But for more than a century now, every advance in this direction has been quickly followed by new means of preserving art's distinction. In this major new work, Groys, one of the world's leading art theorists, charts the paradoxes produced by this tension, which continues to structure the production and reception of new art. The internet, the latest medium through which artists have attempted to disavow this special status, inverts the most notorious consequence of early modernist developments. If the techniques of mechanical reproduction gave us objects without aura, digital production generates aura without objects, transforming all its materials into vanishing markers of the transitory present.

Author: Wim Delvoye
Publisher: Rectapublishers
ISBN:
Category : Art
Languages : en
Pages : 152

View

Book Description
Borrowing its name from the ancient sewer in Rome, Belgian conceptualist Wim Delvoye's new and improved "Cloaca" is a room-sized shit-making machine whose bowels process two meals a day, serving up a mouthful of complex themes: scatalogy and disgust, high and low culture, man as machine and vice-versa, and the inversion of art semiotics. Many of these same concerns are processed in Delvoye's other work, like the life-sized carved walnut replica of a cement truck, the wood cabinet stocked with 32 circular saw blades painted with scenes in Delft China blue, and a herd of pigs tatooed by Antwerp's finest needle-men. Feces and other anal subjects are parsed in accompanying essays by such luminaries as Milan Kundera, Gerardo Mosquera, Dan Cameron, Georges Bataille and Salvador Dali.