Download or read book Analyse caracterisation et optimisation d une liaison optique analogique pour l extraction des donnees d un detecteur de particules written by Giovanni Cervelli and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ANALYSE CARACTERISATION ET OPTIMISATION D UNE LIAISON OPTIQUE ANALOGIQUE POUR L EXTRACTION DES DONNEES D UN DETECTEUR DE PARTICULES written by GIOVANNI.. CERVELLI and published by . This book was released on 1999 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: DEUX TECHNOLOGIES DE LIAISON OPTIQUE ONT ETE CONSIDEREES POUR LA LECTURE DE DONNEES ANALOGIQUES DANS UN ENVIRONNEMENT FORTEMENT RADIOACTIF : LA MODULATION DIRECTE DE LA SOURCE ACTIVE (UNE DIODE LASER INGAASP A EMISSION LATERALE), OU LA MODULATION EXTERNE D'UN FAISCEAU LUMINEUX PAR UN MODULATEUR A ELECTRO-ABSORPTION (CAVITE FABRY-PEROT EN INP, UTILISEE EN MODE REFLECTIF). UN MODELE FONCTIONNEL DES PROTOTYPES DE LIAISON CORRESPONDANTS AUX DEUX SOLUTIONS ALTERNATIVES A ETE DEVELOPPE COMME SUPPORT A LEUR ANALYSE ET OPTIMISATION. DES PROCEDURES DE QUALIFICATION UNIFORMES (ET DES OUTILS D'EVALUATION) ONT ETE DEVELOPPES POUR PERMETTRE DE DETERMINER LES AVANTAGES ET INCONVENIENTS DE CHAQUE SOLUTION EN VUE DE L'UTILISATION DANS LE DETECTEUR CMS. DES PROTOTYPES CORRESPONDANTS A DIFFERENTES ARCHITECTURES OU A DIFFERENTES CLASSES DE COMPOSANTS ONT ETE EVALUES ET COMPARES. LES RESULTATS EXPERIMENTAUX ONT CONSTITUE UN FACTEUR ESSENTIEL SUR LEQUEL LE CHOIX TECHNOLOGIQUE DE LA COLLABORATION EN FAVEUR DE LA MODULATION DIRECTE S'EST BASE. LA LIAISON OPTIQUE A UNE LINEARITE MEILLEURE QUE 1% ET UNE GAMME DYNAMIQUE INSTANTANEE DE L'ORDRE DE 1000 : 1 DANS UNE BANDE PASSANTE DE 100 MHZ. LA PUISSANCE DISSIPEE ET LA TOLERANCE AUX RADIATIONS SONT COMPATIBLES AVEC LES SPECIFICATIONS DU DETECTEUR CMS, MAIS IMPLIQUENT UNE RE-CALIBRATION PERIODIQUE ET UN FONCTIONNEMENT PROCHE DU SEUIL DU LASER. UNE GAMME DYNAMIQUE EFFICACE DE 800:1 PEUT ETRE MAINTENUE TOUT AU LONG DE LA VIE DU DETECTEUR. UNE LIAISON PROTOTYPE A ETE INTEGREE DANS UNE CHAINE DE LECTURE COMPLETE, COMPORTANT UN SERIALISEUR DES DONNEES AU NIVEAU DU TRANSMETTEUR ET UN DIGITALISEUR DES DONNEES AU NIVEAU DU RECEPTEUR (DEVELOPPES PAR D'AUTRES GROUPES). LA PERFORMANCE ANALOGIQUE DE LA CHAINE A ETE OPTIMISEE. SA FONCTIONNALITE A ETE DEMONTREE GRACE A L'EMULATION DES SIGNAUX DU DETECTEUR. LE MODELE DE LA LIAISON OPTIQUE EST EXPLOITE POUR ANALYSER LA DISPERSION DES PARAMETRES ATTENDUE DES 50 000 CANAUX. LA SIMULATION MONTECARLO EST UTILISEE POUR OPTIMISER LES SPECIFICATIONS DES COMPOSANTS, QUI SERONT FIXES DANS LE COUR DE L'ANNEE 1999.
Download or read book Optimisation d un syst me d Optique Adaptative pour l observation de l espace et mise en oeuvre d un d tecteur proche infra rouge innovant en analyse de front d onde written by Silvère Gousset and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'Optique Adaptative (OA) est une technologie mature qui permet de corriger les effets de l'atmosphère sur la formation des images. Les futurs systèmes nécessitent toutefois des développements dans le domaine de l'astronomie afin d'augmenter la couverture du ciel. L'avènement des matrices de PhotoDiodes à Avalanche (APD) est en ce sens prometteur, en permettant l'analyse de front d'onde faible flux du visible au proche infra-rouge. D'autres domaines cherchent également à bénéficier de l'OA, tels que la surveillance de l'espace ou les télécommunications optiques en espace libre. L'intégration du banc d'OA ODISSEE à l'OCA offre un accès au ciel pour valider les nouveaux concepts dans chacun de ces domaines. Nous présentons dans ce mémoire la démarche suivie afin d'étalonner et optimiser le banc. Une analyse fine des sources d'erreur est réalisée à partir d'une caractérisation complète du système et de ses résultats en fonctionnement, appuyée par une modélisation au préalable recalée. Ces travaux permettent de guider les améliorations futures du banc en termes d'optimisation, et représentent de plus un gain en opérabilité dans les domaines de la surveillance et des télécommunications, où ODISSEE a acquis un statut unique en Europe. Parallèlement, nous préparons la mise en oeuvre en analyse de front d'onde d'un détecteur APD, autour de l'étude de la caméra RAPID. Il s'agit d'étudier l'impact en OA des défauts de cosmétique, et du bruit spatial fixe. Nous en proposons une modélisation et simulons sa propagation. Ces travaux ouvrent la voie à la conception d'un ASO RAPID optimisé, exploitant l'avancée majeure pour l'OA que constitue cette nouvelle génération de détecteurs.
Download or read book Biomimicry written by Janine M. Benyus and published by Harper Collins. This book was released on 2009-08-11 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Repackaged with a new afterword, this "valuable and entertaining" (New York Times Book Review) book explores how scientists are adapting nature's best ideas to solve tough 21st century problems. Biomimicry is rapidly transforming life on earth. Biomimics study nature's most successful ideas over the past 3.5 million years, and adapt them for human use. The results are revolutionizing how materials are invented and how we compute, heal ourselves, repair the environment, and feed the world. Janine Benyus takes readers into the lab and in the field with maverick thinkers as they: discover miracle drugs by watching what chimps eat when they're sick; learn how to create by watching spiders weave fibers; harness energy by examining how a leaf converts sunlight into fuel in trillionths of a second; and many more examples. Composed of stories of vision and invention, personalities and pipe dreams, Biomimicry is must reading for anyone interested in the shape of our future.
Download or read book Principles of Radar and Sonar Signal Processing written by Chevalier François Le and published by Artech House. This book was released on 2002 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific Canadian Mechanics Magazine and Patent Office Record written by Canada. Patent Office and published by . This book was released on 1966-03 with total page 1070 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Guide To Soil Mechanics written by Malcolm D Bolton and published by Universities Press. This book was released on 2013 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covers all the soil mechanics and foundation engineering topics that are commonly included in civil engineering degree courses, and provides a number of springboards into related advanced topics. Although it is intended principally to satisfy the needs of student civil engineers, this guide should also prove useful to those practicing engineers who are unaware of the powerful and elegant reconstruction of the subject which has been made possible by the recent concepts of plasticity, dilatancy and critical states.
Download or read book The London Underground and the public private partnership agreements written by Great Britain: Parliament: House of Commons: Transport Committee and published by The Stationery Office. This book was released on 2008-01-25 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report from the Transport Committee, examines London Underground and the Public-Private Partnership Agreements. The Government originally announced proposals for modernising the London Underground network system via Public-Private Partnership (PPP) agreements in 1998. Three contracts were drawn up with: (i) Tube Lines for the maintenance and renewal of the Jubilee, Piccadilly and Northern Lines; (ii) with Metronet Rail BVC for the maintenance and renewal of the Bakerloo, Central, Victoria & Waterloo & City Lines; (iii) with Metronet Rail SSL, responsible for the maintenance and renewal of the "sub-surface lines": the Circle, District, Hammersmith & City, Metropolitan & East London Lines. These PPP Agreements, 30 years in duration, were arrangements to maintain, renew and upgrade parts of London Underground by private sector infrastructure companies (Infracos), whilst London Underground is responsible for services to customers. The PPP Agreements also set out a performance-related incentive and penalty scheme to remunerate the Infracos for the improvements they make to the network. In May 2007, Metronet admitted an overspend of £1 billion and was refused access to loan facilities by the banks. It then made a reference to the PPP Arbiter, which in turn triggered an Extraordinary Review (which occurs when extra costs are incurred above the level allowed for the bid). Metronet put in a bid for £551m but the PPP Arbiter provisionally concluded that a sum of £121m was appropriate. Metronet subsequently went into administration on 18 July 2007. The report sets out a number of conclusions and recommendations, including: contracts that were supposed to deliver 35 station upgrades, in fact delivered only 14, 40% of the requirement; stations that were supposed to cost Metronet SSL £2m, cost £7.5m, with only 65% of schedule track renewal accomplished; the Committee criticises the consequences of the imposition of PPP on Transport for London, as a "lamentable state of affairs", with the future of most of London Underground's upgrade and maintenance work in doubt; the Committee states, that the Government should remember the failure of Metronet before it considers entering similar arrangements; that the Government should publish a candid analysis of the events preceding Metronet's collapse and its consequences; the Committee believe that the PPP model was flawed and probably inferior to traditional public-sector management; that the Government needs to prioritise transparency and clarity to taxpayers and ensure that any future contracts result in clear accountability.
Download or read book Enhanced Abutment Scour Studies for Compound Channels written by Terry W. Sturm and published by DIANE Publishing. This book was released on 2004 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental results and analyses are given in this report on bridge abutment scour in compound channels. Experiments were conducted in a laboratory flume with a cross section consisting of a wide floodplain adjacent to a main channel. The embankment length, discharge, sediment size, and abutment shape were varied, and the resulting equilibrium scour depths were measured. Water-surface profiles, velocities, and scour-hole contours were also measured. In the report, a methodology is developed for estimating abutment scour that takes into account the redistribution of discharge in the bridge contraction, abutment shape, sediment size, and tailwater depth. The independant variables in the proposed scour formula are evaluated at the approach-channel cross section and can be obtained froma one-dimensional water-surface profile computer program such as the Water-Surface Profile Program (WSPRO). The proposed scour evaluation procedure is outlined and illustrated, including consideration of the time required to reach equilibrium scour. The proposed methodology is applied to two cases of measured scour in the field.
Download or read book Modern Radar Detection Theory written by Antonio De Maio and published by IET. This book was released on 2015-11-25 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern radar detection is the new frontier for advanced radar systems capable of operating in challenging scenarios with a plurality of interference sources, both manmade and natural. Written by top researchers and recognized leaders in the field, this is the first book to provide a comprehensive understanding of the current research trends in modern radar detection. It updates readers with the latest radar signal processing algorithms now capable with high-speed computer chips and sophisticated programs. It also includes examples and applications from real systems. This is essential reading for radar systems design engineers within aerospace companies, military radar engineers, and aerospace contractors/consultants.
Download or read book Advanced Ultrawideband Radar written by James D. Taylor and published by CRC Press. This book was released on 2016-12-19 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the latest theory, developments, and applications related to high resolution materials-penetrating sensor systems. An international team of expert researchers explains the problems and solutions for developing new techniques and applications. Subject areas include ultrawideband (UWB) signals propagation and scattering, materials-penetrating radar techniques for small object detection and imaging, biolocation using holographic techniques, tomography, medical applications, nondestructive testing methods, electronic warfare principles, through-the-wall radar propagation effects, and target identification through measuring the target return signal spectrum changes.
Download or read book Water Treatment Handbook written by and published by . This book was released on 2007 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt:
