ETUDE THEORIQUE D'UNE METHODE DE TELEDETECTION DE L'HUMIDITE DES SOLS DANS LA GAMME 100 MHZ - 1 GHZ PDF Download

Author: KAMEL.. SASSI
Publisher:
ISBN:
Category :
Languages : fr
Pages : 119

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DETERMINATION DE L'HUMIDITE DU SOL PAR L'INTERMEDIAIRE DE LA CONSTANTE ELECTRIQUE. INTERPRETATION DES FORMES DE RUGOSITE DU SOL ET DES DIVERSES TEXTURES D'UN COUVERT VEGETAL PAR DS CULTURES CEREALIERES OU MARAICHERES

Author: RACHIDA.. HOUSSA
Publisher:
ISBN: 9782709913447
Category :
Languages : fr
Pages : 199

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LE TRAVAIL PRESENTE DANS CE MEMOIRE ENTRE DANS LE CADRE DU PROGRAMME HAPEX-SAHEL. L'OBJECTIF ETAIT DE CARACTERISER, DANS LE DOMAINE SPECTRAL DU VISIBLE AU MOYEN INFRAROUGE (0,4-2,4 M), LES PAYSAGES D'EROSION ET DE DEGRADATION DES SOLS NUS A L'AIDE DES DONNEES DE TELEDETECTION MULTI-ECHELLES. AUX DONNEES GEOCHIMIQUES, GRANULOMETRIQUES ET MESURES SPECTROPHOTOMETRIQUES DE LABORATOIRE, ONT ETE CONFRONTEES DES MESURES RADIOMETRIQUES DE TERRAIN, D'AVION NS001 ET DE SATELLITES (SPOT ET LANDSAT TM). LA ZONE D'ETUDE EST LE SITE DE BANIZOUMBOU. IL SE CARACTERISE PAR 3 PRINCIPAUX TYPES DE SOLS: LES CUIRASSES, LES SOLS FERRUGINEUX ET LES FORMATIONS SABLEUSES. IL Y A UNE FORTE CONCORDANCE ENTRE LES MESURES SPECTROPHOTOMETRIQUES DE LABORATOIRE ET LES MESURES RADIOMETRIQUES DE TERRAIN QUI ONT PERMIS DE TROUVER UNE RELATION QUALITATIVE ET QUANTITATIVE ENTRE LA REPONSE SPECTRALE DES SOLS ET LEURS PRINCIPAUX COMPOSANTS MINERALOGIQUES. DE PLUS A PARTIR DES MESURES RADIOMETRIQUES DE TERRAIN IL A ETE POSSIBLE DE METTRE EN EVIDENCE L'EFFET IMPORTANT DE LA COMPOSITION GRANULOMETRIQUE ET DE LA RUGOSITE DU SOL SUR LA REPONSE SPECTRALE DE CELUI-CI. L'ETUDE DES DONNEES AEROPORTEES ET SATELLITAIRES A PERMIS D'IDENTIFIER, PAR LE BIAIS D'INDICES RADIOMETRIQUES LES DIFFERENTS TYPES DE SOLS EN FONCTION DE LEURS COMPOSITIONS MINERALOGIQUES ET GRANULOMETRIQUES. ON A PU METTRE EN EVIDENCE L'EFFET DE L'HUMIDITE DURANT LA SAISON DES PLUIES ET DES AEROSOLS DESERTIQUES DURANT LA SAISON SECHE SUR L'INFORMATION DONNEE PAR CERTAINS INDICES RADIOMETRIQUES. EN PLUS LA COMPARAISON MULTIDATE DES DONNEES SPOT A FACILITE L'IDENTIFICATION DES ANNEES LES PLUS SECHES ET LA DELIMITATION DES ZONES LES PLUS EXPOSEES AU PROCESSUS DE DESERTIFICATION. LA COMPARAISON MULTI-ECHELLE ENTRE LES DONNEES AEROPORTEES ACQUISES A UNE TRES HAUTE RESOLUTION SPATIALE ET LES DONNEES LANDSAT TM DE BASSE RESOLUTION SPATIALE A ETE REALISEE A L'AIDE DE LA METHODE DE CHANGEMENT D'ECHELLE APPLIQUEE ESSENTIELLEMENT POUR LE RAPPORT TM5/TM7. LES RESULTATS DE CETTE APPLICATION ONT MONTRE QUE POUR DES SOLS NUS, LE CALCUL DU RAPPORT TM5/TM7 A PARTIR DES DONNEES TM DONNE UNE BONNE APPROXIMATION DES VALEURS QUE L'ON AURAIT OBTENU AVEC LES DONNEES AVION

Author: Richard Escadafal
Publisher: IRD Orstom
ISBN:
Category : Geographic information systems
Languages : fr
Pages : 674

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ISSS congress remote sensing

Author: Food and Agriculture Organization of the United Nations. Land and Water Development Division
Publisher: Food & Agriculture Org.
ISBN: 9789251034293
Category : Technology & Engineering
Languages : en
Pages : 136

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Author: Sébastien Forget
Publisher: Springer
ISBN: 3642367054
Category : Science
Languages : en
Pages : 179

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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: Georgios B. Giannakis
Publisher: John Wiley & Sons
ISBN: 047146287X
Category : Technology & Engineering
Languages : en
Pages : 488

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Eine vielversprechende Technologie zur Maximierung der Bandbreiteneffizienz in der breitbandigen drahtlosen Kommunikation ist die Raum-Zeit-Kodierung. Theorie und Praxis verbindend, ist dieses Buch die erste umfassende Diskussion von Grundlagen und designorientierten Aspekten von Raum-Zeit-Codes. Single-Carrier und Multi-Carrier-Übertragungen für Einzel- und Mehrnutzerkommunikation werden behandelt.

Author: Miroslav Chomat
Publisher: BoD – Books on Demand
ISBN: 9533075481
Category : Technology & Engineering
Languages : en
Pages : 278

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The subject of this book is an important and diverse field of electric machines and drives. The twelve chapters of the book written by renowned authors, both academics and practitioners, cover a large part of the field of electric machines and drives. Various types of electric machines, including three-phase and single-phase induction machines or doubly fed machines, are addressed. Most of the chapters focus on modern control methods of induction-machine drives, such as vector and direct torque control. Among others, the book addresses sensorless control techniques, modulation strategies, parameter identification, artificial intelligence, operation under harsh or failure conditions, and modelling of electric or magnetic quantities in electric machines. Several chapters give an insight into the problem of minimizing losses in electric machines and increasing the overall energy efficiency of electric drives.

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: F Lasnier
Publisher: CRC Press
ISBN: 9780852743119
Category : Science
Languages : en
Pages : 576

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Book Description
The Photovoltaic Engineering Handbook is the first book to look closely at the practical problems involved in evaluating and setting up a photovoltaic (PV) power system. The author's comprehensive knowledge of the subject provides a wealth of theoretical and practical insight into the different procedures and decisions that designers need to make. Unique in its coverage, the book presents technical information in a concise and simple way to enable engineers from a wide range of backgrounds to initiate, assess, analyze, and design a PV system. It is beneficial for energy planners making decisions on the most appropriate system for specific needs, PV applications engineers, and anyone confronting the practical difficulties of setting up a PV power system.

Author: Rentsen Enkhbat
Publisher: Springer Nature
ISBN: 303141229X
Category : Mathematics
Languages : en
Pages : 202

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Book Description
This volume gathers selected, peer-reviewed works presented at the 7th International Conference on Optimization, Simulation and Control, ICOSC 2022, held at the National University of Mongolia, Ulaanbaatar, June 20–22, 2022. Topics covered include (but are not limited to) mathematical programming; network, global, linear, nonlinear, parametric, stochastic, and multi-objective optimization; control theory; biomathematics; and deep and machine learning, to name a few. Held every three years since 2002, the ICOSC conference has become a traditional gathering for experienced and young researchers in optimization and control to share recent findings in these fields and discuss novel applications in myriad sectors. Researchers and graduate students in the fields of mathematics, engineering, and computer science can greatly benefit from this book, which can also be enjoyed by advanced practitioners in research laboratories and the industry. The 2022 edition of the ICOSC conference was sponsored by the Mongolian Academy of Sciences, the National University of Mongolia and the German-Mongolian Institute for Resources and Technology.