Structure Electronique Des Materiaux A Partir De La Densite De Charge Et Dimpulsion

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STRUCTURE ELECTRONIQUE DES MATERIAUX A PARTIR DE LA DENSITE DE CHARGE ET D'IMPULSION

Author : OLIVER.. BECKERS
Publisher :
ISBN 13 :
Total Pages : 137 pages
Book Rating : 4.:/5 (49 download)

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Book Synopsis STRUCTURE ELECTRONIQUE DES MATERIAUX A PARTIR DE LA DENSITE DE CHARGE ET D'IMPULSION by : OLIVER.. BECKERS

Download or read book STRUCTURE ELECTRONIQUE DES MATERIAUX A PARTIR DE LA DENSITE DE CHARGE ET D'IMPULSION written by OLIVER.. BECKERS and published by . This book was released on 1997 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES EXPERIENCES DE DIFFRACTION ET DE DIFFUSION DES PHOTONS APPORTENT DES INFORMATIONS IMPORTANTES SUR L'ETAT FONDAMENTAL D'UN SYSTEME CHIMIQUE. ELLES PERMETTENT D'EN DETERMINER LES DENSITES ELECTRONIQUES DE CHARGE ET D'IMPULSION. NOUS NOUS INTERESSONS A LEUR COMPLEMENTARITE AFIN DE VOIR DANS QUELLE MESURE LA CONNAISSANCE DE CES DEUX FONCTIONS PERMET D'ACCEDER A LA MATRICE DENSITE DU PREMIER ORDRE. UN MODELE SIMPLE POUR LA FONCTION D'ONDE DE LA MOLECULE DE L'HYDRURE DE LITHIUM EST PROPOSE, SES PARAMETRES SONT AFFINES SUR DIFFERENTS JEUX DE DONNEES THEORIQUES. NOUS AVONS MONTRE QUE LE MODELE PERMET DE BIEN DECRIRE LA DENSITE D'IMPULSION ET LES PROFILS COMPTON ET D'OBTENIR EN MEME TEMPS UNE REPRESENTATION VALABLE DE LA DENSITE DE CHARGE DANS L'ESPACE INTERATOMIQUE. IL EST DONC POSSIBLE DE TIRER DES CONCLUSIONS D'UN AFFINEMENT DE LA DENSITE D'IMPULSION OU DE SES PROJECTIONS SUR L'ETAT DES LIAISONS CHIMIQUES. NOUS NOUS ATTACHONS EGALEMENT A L'INTERPRETATION QUANTITATIVE DE LA DIFFUSION INELASTIQUE COMPTON : NOUS LE FAISONS PAR UNE ETUDE THEORIQUE DE LA DEVIATION DU MODELE DE LIAISON IONIQUE POUR L'OXYDE DE MAGNESIUM CRISTALLINE DANS L'ESPACE DES IMPULSIONS. NOUS AVONS ESTIME LES PARAMETRES ESSENTIELS D'UN MODELE DE STRUCTURE DE BANDE A INTERACTION COVALENTE LOCALE PAR UN AFFINEMENT. LE PASSAGE DU MODELE ATOMIQUE AU MODELE IONIQUE, DONC LA COHESION CRISTALLINE, PEUT ETRE APERCU CLAIREMENT DANS LA DENSITE D'IMPULSION. L'EFFET DE L'INTERACTION COVALENTE EST FAIBLEMENT ANTILIANT MAIS PERCEPTIBLE. NOUS PARVENONS A REPRODUIRE L'ESSENTIEL DE LA DENSITE D'IMPULSION A L'AIDE DE TROIS PARAMETRES SEULEMENT. NOUS OBTENONS UN MODELE DE COHESION TRES SIMPLE QUI AMELIORE CONSIDERABLEMENT LA DESCRIPTION IONIQUE.

Structure électronique des matériaux à partir de la densité de charge et d'impulsion

Author : Oliver Beckers
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (793 download)

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Book Synopsis Structure électronique des matériaux à partir de la densité de charge et d'impulsion by : Oliver Beckers

Download or read book Structure électronique des matériaux à partir de la densité de charge et d'impulsion written by Oliver Beckers and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les experiences de diffraction et de diffusion des photons apportent des informations importantes sur l'etat fondamental d'un systeme chimique. Elles permettent d'en determiner les densites electroniques de charge et d'impulsion. Nous nous interessons a leur complementarite afin de voir dans quelle mesure la connaissance de ces deux fonctions permet d'acceder a la matrice densite du premier ordre. Un modele simple pour la fonction d'onde de la molecule de l'hydrure de lithium est propose, ses parametres sont affines sur differents jeux de donnees theoriques. Nous avons montre que le modele permet de bien decrire la densite d'impulsion et les profils compton et d'obtenir en meme temps une representation valable de la densite de charge dans l'espace interatomique. Il est donc possible de tirer des conclusions d'un affinement de la densite d'impulsion ou de ses projections sur l'etat des liaisons chimiques. Nous nous attachons egalement a l'interpretation quantitative de la diffusion inelastique compton : nous le faisons par une etude theorique de la deviation du modele de liaison ionique pour l'oxyde de magnesium cristalline dans l'espace des impulsions. Nous avons estime les parametres essentiels d'un modele de structure de bande a interaction covalente locale par un affinement. Le passage du modele atomique au modele ionique, donc la cohesion cristalline, peut etre apercu clairement dans la densite d'impulsion. L'effet de l'interaction covalente est faiblement antiliant mais perceptible. Nous parvenons a reproduire l'essentiel de la densite d'impulsion a l'aide de trois parametres seulement. Nous obtenons un modele de cohesion tres simple qui ameliore considerablement la description ionique.

Quantum Mechanics, Volume 3

Author : Claude Cohen-Tannoudji
Publisher : John Wiley & Sons
ISBN 13 : 3527345558
Total Pages : 790 pages
Book Rating : 4.5/5 (273 download)

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Book Synopsis Quantum Mechanics, Volume 3 by : Claude Cohen-Tannoudji

Download or read book Quantum Mechanics, Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.

X-Ray and Neutron Reflectivity: Principles and Applications

Author : Jean Daillant
Publisher : Springer Science & Business Media
ISBN 13 : 3540486968
Total Pages : 347 pages
Book Rating : 4.5/5 (44 download)

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Book Synopsis X-Ray and Neutron Reflectivity: Principles and Applications by : Jean Daillant

Download or read book X-Ray and Neutron Reflectivity: Principles and Applications written by Jean Daillant and published by Springer Science & Business Media. This book was released on 2003-07-01 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reflection of and neutrons from surfaces has existed as an x-rays exp- imental for almost it is in the last technique fifty Nevertheless, only years. decade that these methods have become as of enormously popular probes This the surfaces and interfaces. to be due to of several appears convergence of intense different circumstances. These include the more n- availability be measured orders tron and sources that can over (so reflectivity x-ray many of and the much weaker surface diffuse can now also be magnitude scattering of thin films and studied in some the detail); growing importance multil- basic the realization of the ers in both and technology research; important which in the of surfaces and and role roughness plays properties interfaces; the of statistical models to characterize the of finally development topology its and its characterization from on roughness, dependence growth processes The of and to surface scattering experiments. ability x-rays neutro4s study four five orders of in scale of surfaces over to magnitude length regardless their and also their to ability probe environment, temperature, pressure, etc. , makes these the choice for buried interfaces often probes preferred obtaining information about the microstructure of often in statistical a global surfaces, the local This is manner to complementary imaging microscopy techniques, of such studies in the literature witnessed the veritable by explosion published the last few Thus these lectures will useful for over a resource years.

Multifunctional Oxide Heterostructures

Author : Evgeny Y. Tsymbal
Publisher : OUP Oxford
ISBN 13 : 0191642223
Total Pages : 416 pages
Book Rating : 4.1/5 (916 download)

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Book Synopsis Multifunctional Oxide Heterostructures by : Evgeny Y. Tsymbal

Download or read book Multifunctional Oxide Heterostructures written by Evgeny Y. Tsymbal and published by OUP Oxford. This book was released on 2012-08-30 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to the rapidly developing field of oxide thin-films and heterostructures. Oxide materials combined with atomic-scale precision in a heterostructure exhibit an abundance of macroscopic physical properties involving the strong coupling between the electronic, spin, and structural degrees of freedom, and the interplay between magnetism, ferroelectricity, and conductivity. Recent advances in thin-film deposition and characterization techniques made possible the experimental realization of such oxide heterostructures, promising novel functionalities and device concepts. The book consists of chapters on some of the key innovations in the field over recent years, including strongly correlated oxide heterostructures, magnetoelectric coupling and multiferroic materials, thermoelectric phenomena, and two-dimensional electron gases at oxide interfaces. The book covers the core principles, describes experimental approaches to fabricate and characterize oxide heterostructures, demonstrates new functional properties of these materials, and provides an overview of novel applications.

Lasers in Materials Processing

Author : Edward A. Metzbower
Publisher : ASM International(OH)
ISBN 13 :
Total Pages : 286 pages
Book Rating : 4.:/5 (89 download)

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Book Synopsis Lasers in Materials Processing by : Edward A. Metzbower

Download or read book Lasers in Materials Processing written by Edward A. Metzbower and published by ASM International(OH). This book was released on 1983 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Color Television Receivers

Author :
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Color Television Receivers by :

Download or read book Color Television Receivers written by and published by . This book was released on 1980 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report to the President on investigation no. 332-95 under section 332 of the Tariff Act of 1930, as amended.

An Introduction to Differential Manifolds

Author : Jacques Lafontaine
Publisher : Springer
ISBN 13 : 3319207350
Total Pages : 408 pages
Book Rating : 4.3/5 (192 download)

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Book Synopsis An Introduction to Differential Manifolds by : Jacques Lafontaine

Download or read book An Introduction to Differential Manifolds written by Jacques Lafontaine and published by Springer. This book was released on 2015-07-29 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an introduction to differential manifolds. It gives solid preliminaries for more advanced topics: Riemannian manifolds, differential topology, Lie theory. It presupposes little background: the reader is only expected to master basic differential calculus, and a little point-set topology. The book covers the main topics of differential geometry: manifolds, tangent space, vector fields, differential forms, Lie groups, and a few more sophisticated topics such as de Rham cohomology, degree theory and the Gauss-Bonnet theorem for surfaces. Its ambition is to give solid foundations. In particular, the introduction of “abstract” notions such as manifolds or differential forms is motivated via questions and examples from mathematics or theoretical physics. More than 150 exercises, some of them easy and classical, some others more sophisticated, will help the beginner as well as the more expert reader. Solutions are provided for most of them. The book should be of interest to various readers: undergraduate and graduate students for a first contact to differential manifolds, mathematicians from other fields and physicists who wish to acquire some feeling about this beautiful theory. The original French text Introduction aux variétés différentielles has been a best-seller in its category in France for many years. Jacques Lafontaine was successively assistant Professor at Paris Diderot University and Professor at the University of Montpellier, where he is presently emeritus. His main research interests are Riemannian and pseudo-Riemannian geometry, including some aspects of mathematical relativity. Besides his personal research articles, he was involved in several textbooks and research monographs.

Revisiting Moroccan Migrations

Author : Mohammed Berriane
Publisher : Routledge
ISBN 13 : 1317215303
Total Pages : 232 pages
Book Rating : 4.3/5 (172 download)

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Book Synopsis Revisiting Moroccan Migrations by : Mohammed Berriane

Download or read book Revisiting Moroccan Migrations written by Mohammed Berriane and published by Routledge. This book was released on 2018-02-02 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the 20th century, Morocco has become one of the world’s major emigration countries. But since 2000, growing immigration and settlement of migrants from sub-Saharan Africa, the Middle East, and Europe confronts Morocco with an entirely new set of social, cultural, political and legal issues. This book explores how continued emigration and increasing immigration is transforming contemporary Moroccan society, with a particular emphasis on the way the Moroccan state is dealing with shifting migratory realities. The authors of this collective volume embark on a dialogue between theory and empirical research, showcasing how contemporary migration theories help understanding recent trends in Moroccan migration, and, vice-versa, how the specific Moroccan case enriches migration theory. This perspective helps to overcome the still predominant Western-centric research view that artificially divide the world into ‘receiving’ and ‘sending’ countries and largely disregards the dynamics of and experiences with migration in countries in the Global South. This book was previously published as a special issue of The Journal of North African Studies.

Fluorine Magnetic Resonance Imaging

Author : Ulrich Flogel
Publisher : CRC Press
ISBN 13 : 9814745324
Total Pages : 462 pages
Book Rating : 4.8/5 (147 download)

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Book Synopsis Fluorine Magnetic Resonance Imaging by : Ulrich Flogel

Download or read book Fluorine Magnetic Resonance Imaging written by Ulrich Flogel and published by CRC Press. This book was released on 2016-10-26 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past decade, fluorine (19F) magnetic resonance imaging (MRI) has garnered significant scientific interest in the biomedical research community owing to the unique properties of fluorinated materials and the 19F nucleus. Fluorine has an intrinsically sensitive nucleus for MRI. There is negligible endogenous 19F in the body and thus there is no background signal. Fluorine-containing compounds are ideal tracer labels for a wide variety of MRI applications. Moreover, the chemical shift and nuclear relaxation rate can be made responsive to physiology via creative molecular design. This book is an interdisciplinary compendium that details cutting-edge science and medical research in the emerging field of 19F MRI. Edited by Ulrich Flögel and Eric Ahrens, two prominent MRI researchers, this book will appeal to investigators involved in MRI, biomedicine, immunology, pharmacology, probe chemistry, and imaging physics.

Aeronomy

Author : P. M. Banks
Publisher : Elsevier
ISBN 13 : 1483260666
Total Pages : 445 pages
Book Rating : 4.4/5 (832 download)

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Book Synopsis Aeronomy by : P. M. Banks

Download or read book Aeronomy written by P. M. Banks and published by Elsevier. This book was released on 2013-09-24 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aeronomy, Part A is an attempt to make a comprehensive exposition of the processes in aeronomy, the study of composition, movement, and thermal balance of the upper regions of the planetary atmosphere. The text covers topics such as atmospheric regions and atmospheric density, the temperature and molecular mass of the atmosphere; the permanent constituents and the molecular and isotonic composition of the homosphere; and the transition from the homosphere to the heterosphere. Also covered are topics such as the temperature gradient and energies in the thermosphere, conditions at 200km and above 250km, solar radiation and ionization, and aeronomic reactions. The book is recommended for scientists, especially natural physicists, who would like to know more about the field of aeronomy and its advances.

Scientific Basis for Nuclear Waste Management XXII: Volume 556

Author : David J. Wronkiewicz
Publisher :
ISBN 13 :
Total Pages : 1370 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Scientific Basis for Nuclear Waste Management XXII: Volume 556 by : David J. Wronkiewicz

Download or read book Scientific Basis for Nuclear Waste Management XXII: Volume 556 written by David J. Wronkiewicz and published by . This book was released on 1999-11-24 with total page 1370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Safe and effective management of nuclear waste provides a broad range of challenges for materials science. Waste processing, waste form and engineered barrier properties, interactions between engineered and geological systems, radiation effects, chemistry and transport of waste species, and long-term predictions of repository performance are just some of the scientific problems facing modern society. This book, the 22nd in a very successful series from MRS, offers an international and inter-disciplinary perspective on the issues, and features developments in both fundamental and applied areas. Topics include: development and characterization of ceramic waste forms; ceramic waste form corrosion; glass waste form processing; glass formulation, properties and structure; glass waste form corrosion; spent nuclear fuel; performance assessment; repository backfill; flow and transport; natural analogues; container corrosion; metal waste form corrosion; radionuclide speciation and solubility; radionuclide sorption; microbial effects; radiation effects; cement waste forms and waste treatment.

Minimum competence in scientific English

Author : Sue Blattes
Publisher : L'Editeur : EDP Sciences
ISBN 13 : 9782868835888
Total Pages : 264 pages
Book Rating : 4.8/5 (358 download)

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Book Synopsis Minimum competence in scientific English by : Sue Blattes

Download or read book Minimum competence in scientific English written by Sue Blattes and published by L'Editeur : EDP Sciences. This book was released on 2003 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cet ouvrage, devenu célèbre sous son sigle MCSE, a déjà été utilisé par plus de 50 000 étudiants, chercheurs, professionnels. L'objectif est de lire et écrire des textes en anglais scientifique avec facilité et pertinence. L'ouvrage est conçu pour que l'apprenant devienne un véritable utilisateur de l'anglais. La méthode originale repose sur l'analyse des fonctions et structures nécessaires : measurement, frequency, comparison, modification, link words, time, cause and consequence, hypothesis, modality, purpose and process, impersonal forms, compound nouns and adjectives. Dans chaque unit, des tests d'auto-évaluation permettent de se situer et de construire son parcours de formation, d'abord en définissant ses objectifs à l'aide des key points et du lexis, puis, de façon plus personnalisée, en puisant dans les examples in context, checkpoints (back to basics, word web), web search, FAQs... MCSE est l'outil de base d'une méthode qui comprend aussi d'autres outils dans la même collection (Listening Comprehension for Scientiflc English et Speaking Skills in Scientitic English). L'ouvrage est destiné à tout apprenant de niveau baccalauréat qui désire acquérir une réelle compétence dans l'écriture et la lecture de textes en anglais scientifique.

Extraterrestrial Seismology

Author : Vincent C. H. Tong
Publisher : Cambridge University Press
ISBN 13 : 1107041724
Total Pages : 467 pages
Book Rating : 4.1/5 (7 download)

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Book Synopsis Extraterrestrial Seismology by : Vincent C. H. Tong

Download or read book Extraterrestrial Seismology written by Vincent C. H. Tong and published by Cambridge University Press. This book was released on 2015-06-25 with total page 467 pages. Available in PDF, EPUB and Kindle. Book excerpt: Taking a transdisciplinary approach to seismology, this unique book reviews the most recent developments in planetary seismology, helioseismology, and asteroseismology.

Data Storage at the Nanoscale

Author : Gan Fuxi
Publisher : CRC Press
ISBN 13 : 9814613207
Total Pages : 730 pages
Book Rating : 4.8/5 (146 download)

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Book Synopsis Data Storage at the Nanoscale by : Gan Fuxi

Download or read book Data Storage at the Nanoscale written by Gan Fuxi and published by CRC Press. This book was released on 2015-02-09 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the big data era, data storage is one of the cores in the whole information chain, which includes production, transfer, sharing, and finally processing. Over the years, the growth of data volume has been explosive. Today, various storage services need memories with higher density and capacity. Moreover, information storage in the big data applic

Popular Astronomy

Author : Camille Flammarion
Publisher :
ISBN 13 :
Total Pages : 732 pages
Book Rating : 4.A/5 ( download)

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Book Synopsis Popular Astronomy by : Camille Flammarion

Download or read book Popular Astronomy written by Camille Flammarion and published by . This book was released on 1894 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Quantum Theory of Finite Systems

Author : Jean-Paul Blaizot
Publisher : Mit Press
ISBN 13 : 9780262022149
Total Pages : 657 pages
Book Rating : 4.0/5 (221 download)

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Book Synopsis Quantum Theory of Finite Systems by : Jean-Paul Blaizot

Download or read book Quantum Theory of Finite Systems written by Jean-Paul Blaizot and published by Mit Press. This book was released on 1986 with total page 657 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive and pedagogical account of the various methods used in the quantum theory of finite systems, including molecular, atomic, nuclear, and particle phenomena. Covering both background material and advanced topics and including nearly 200 problems, Quantum Theory of Finite Systems has been designed to serve primarily as a text and will also prove useful as a reference in research. The first of the book's four parts introduces the basic mathematical apparatus: second quantization, canonical transformations, Wick theorems and the resulting diagram expansions, and oscillator models. The second part presents mean field approximations and the recently developed path integral methods for the quantization of collective modes. Part three develops perturbation theory in terms of both time-dependent Feynman diagrams and time-independent Goldstone diagrams. A fourth part discusses variational methods based on correlated wavefunctions, including spin correlations. The approximation schemes are formulated for fermions and bosons at eigher zero or non-zero temperature. Although the formalism developed applies to both finite and infinite systems, the book stresses those aspects of the theory that are specific to the description of finite systems. Thus special attention is given to mean field approximations, the ensuing broken symmetries, and the associated collective motions such as rotations. Conversely, some specific features of systems with infinite numbers of degrees of freedom (such as the thermodynamic limit, critical phenomena, and the elimination of ultraviolet divergencies) are deliberately omitted. Jean-Paul Blaizot and Georges Ripka are associated with the Centre d'Etudes Nucleaires de Saclay.