Contribution à l'étude des phénomènes de transport dans les bronzes de tungstène et de molybdène PDF Download

Author: Henri Queinnec
Publisher:
ISBN:
Category :
Languages : fr
Pages : 118

View

Book Description
ETUDE DE COMPOSES A::(X)MO::(3+Y) AVEC A=SB OU BI, M=WOAMO, X=0,2 ET Y=0 OU X/2. L'ETUDE CRISTALLOGRAPHIQUE REVELE LA PRESENCE DE CHAINONS SB::(2)O OU BI::(2)O DANS LES PHASES DE TYPE AXMO::(3+X/2). LES MESURES DE CONDUCTIVITE ELECTRIQUE, DE POUVOIR THERMOELECTRIQUE ET D'EFFET HALL MONTRENT LE CARACTERE METALLIQUE DES PHASES AU TUNGSTENE ET SEMICONDUCTEUR DES PHASES AU MOLYBDENE. UN MODELE A 2 BANDES EST PROPOSE POUR LES PHASES AU MOLYBDENE

Author: Mustapha Morsli
Publisher:
ISBN:
Category :
Languages : fr
Pages : 260

View

Book Description
L'ETUDE DES PROPRIETES DE TRANSPORT (CONDUCTIVITE ELECTRIQUE, POUVOIR THERMOELECTRIQUE, EFFET HALL), SUR UN LARGE DOMAINE DE TEMPERATURE, A ETE EFFECTUEE SUR LES BRONZES DE TUNGSTENE ORTHORHOMBIQUE (O.T.B.) ET LES BRONZES DE MOLYBDENE AU THALLIUM. UN MODELE A UNE BANDE REND COMPTE DE TOUS LES RESULTATS EXPERIMENTAUX OBTENUS SUR BI#4W#2#0O#6#2: CETTE BANDE EST LE SIEGE D'UN MECANISME DE CONDUCTION PAR SAUTS DANS LES ETATS LOCALISES AU NIVEAU DE FERMI. LE MODELE S'APPLIQUE CORRECTEMENT AU CAS DES COMPOSES INTERMEDIAIRES (SB#4W#1#6MO#4O#6#2 ET BI#4W#1#6MO#4O#6#2) ET AUX PHASES SB#4W#2#0O#6#2. UN MODELE DE SEMICONDUCTEUR COMPENSE DE TYPE P A DEUX NIVEAUX INVERSES REND COMPTE DES RESULTATS EXPERIMENTAUX OBTENUS SUR LE BRONZE ROUGE TL#0#,#3#3MOO#3. L'ORIGINE DE CES NIVEAUX EST ATTRIBUEE AUX ORBITALES D#X#Y NON LIANTES DE CERTAINES LIAISONS MOLYBDENE-OXYGENE. LES PROPRIETES ELECTRIQUES MESUREES SUR LE BRONZE BLEU TL#0#,#3#0MOO#3 SONT INTERPRETEES SUR LA BASE D'UN MODELE SIMPLE, A L'AIDE DU PARAMETRE D'ORDRE ASSOCIE A L'INTENSITE DES TACHES SATELLITES OBSERVEES AU-DESSOUS DE 180 K

Author: Agnes Buka
Publisher: World Scientific
ISBN: 1848167997
Category : Science
Languages : en
Pages : 299

View

Book Description
The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.

Author: Unesco. International Scientific Committee for the Drafting of a General History of Africa
Publisher: Univ of California Press
ISBN: 9780520067035
Category : History
Languages : en
Pages : 1076

View

Book Description
The hardcover edition of volume 8 was published in 1994. This paperback edition is the eighth and final volume to be published in the UNESCO General History of Africa. Volume 8 examines the period from 1935 to the present, and details the role of African states in the Second World War and the rise of postwar Africa. This is one of the most important books in the entire series, and as such, it is an unabridged paperback.

Author: International Atomic Energy Agency
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 214

View

Book Description

Author: Jerome V. Moloney
Publisher: Springer Science & Business Media
ISBN: 9780387985817
Category : Business & Economics
Languages : en
Pages : 270

View

Book Description
Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.

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

View

Book Description
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

View

Book Description
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: Wade H. Shafer
Publisher: Springer
ISBN: 9780306341205
Category : Science
Languages : en
Pages : 320

View

Book Description
Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis· seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) *at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac· tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 20 (thesis year 1975) a total of 10,374 theses titles from 28 Canadian and 239 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. The organization of Volume 20 is identical to that of past years. It consists of theses titles arranged by discipline and by university within each discipline.

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

View

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.