Download or read book ETUDE PAR MICROSCOPIE ELECTRONIQUE EN TRANSMISSION DE LA MICROSTRUCTURE DE FLUAGE D ALUMINES POLYCRISTALLINE written by ABDESLEM.. MAMOUN and published by . This book was released on 1994 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA COMPREHENSION TOTALE DES MECANISMES DE DEGRADATION MECANIQUE, NOTAMMENT PAR FLUAGE, DES CERAMIQUES DE TYPE THERMOMECANIQUE PASSE A L'EVIDENCE PAR UNE CARACTERISATION APPROFONDIE DE LA MICROSTRUCTURE DE TELS MATERIAUX. LE TRAVAIL ENTREPRIS A PORTE SUR L'EXAMEN DE LA MICROSTRUCTURE DE DEUX CERAMIQUES POLYCRISTALLINES PAR MICROSCOPIE ELECTRONIQUE EN TRANSMISSION (MET). LE PREMIER DE CES DEUX MATERIAUX EST UNE ALUMINE-ALPHA POLYCRISTALLINE A GRAINS FINS ET DE GRANDE PURETE; IL PRESENTE UN BON COMPORTEMENT EN FLUAGE (I.E., UNE FAIBLE VITESSE DE FLUAGE). L'ETUDE PAR MET APRES DEFORMATION REVELE UN MECANISME DE CAVITATION QUI A ETE EVALUE PAR UNE APPROCHE STATISTIQUE (I.E. COMPTAGE DES CAVITES). LES RESULTATS ANTERIEURS D'ESSAIS MECANIQUES REALISES SUR CE MATERIAU ONT ETE RE-INTERPRETES AU VU DES MODELES THEORIQUES DE FLUAGE DISPONIBLES DANS LA LITTERATURE; LE MODELE DE FLUAGE-DIFFUSION CONTROLE PAR L'INTERFACE, COMPATIBLE AVEC LES OBSERVATIONS EN MET, CONDUIT A DES VALEURS TRES COHERENTES POUR LES PARAMETRES ESSENTIELS INTERVENANT DANS LA LOI DE FLUAGE (VITESSE DE FLUAGE ET EXPOSANT DE CONTRAINTE). LE SECOND MATERIAU EST UNE ALUMINE-ALPHA SIMILAIRE, MAIS CONTENANT UNE QUANTITE NON NEGLIGEABLE D'IMPURETES (OXYDES DE MAGNESIUM ET DE POTASSIUM). CES AJOUTS CONDUISENT A L'APPARITION D'UNE SECONDE PHASE MINORITAIRE, DITE ALUMINE BETA AU POTASSIUM, QUI A ETE CARACTERISEE DE MANIERE APPROFONDIE EN MET CONVENTIONNELLE, ANALYTIQUE ET A HAUTE RESOLUTION DANS LES ECHANTILLONS BRUTS D'ELABORATION. CETTE SECONDE PHASE CONNAIT UNE EVOLUTION STRUCTURALE SPECTACULAIRE EN COURS DE FLUAGE: D'UNE PART, ELLE SE TRANSFORME EN PHASE SPINELLE; LA DIMINUTION DE VOLUME ASSOCIEE CONTRIBUE A LA DEGRADATION DU MATERIAU (APPARITION DE CAVITES ET MICRO-FISSURES AU VOISINAGE DES PARTICULES D'ALUMINE-BETA). D'AUTRE PART, LE POTASSIUM EJECTE DES PARTICULES LORS DE CETTE TRANSFORMATION CONDUIT A UNE ATTAQUE CORROSIVE DES GRAINS D'ALUMINE-ALPHA VOISINS. CE PHENOMENE A ETE ETUDIE EN DETAILS PAR MET, ET ANALYSE DE MANIERE COHERENTE DU POINT DE VUE THERMODYNAMIQUE (EVALUATION DES ENTHALPIES DE REACTIONS DE CORROSION ENVISAGEABLES, ET PROPOSITION D'UN SCENARIO REALISTE EXPLIQUANT LES REACTIONS PHYSICOCHIMIQUES SUCCESSIVEMENT MISES EN JEU AU COURS DU FLUAGE ET LORS DE LA PREPARATION DES LAMES MINCES POUR OBSERVATION AU MICROSCOPE). L'ENSEMBLE DES RESULTATS EXPERIMENTAUX MONTRE L'INTERET DE LA MET POUR L'ETUDE DES PROPRIETES MECANIQUES DES CERAMIQUES

Download or read book ETUDE PAR MICROSCOPIE ELECTRONIQUE DE LA MICROSTRUCTURE ET DES MECANISMES DE LA DEFORMATION DE L ALLIAGE D ALUMINIUM 6056 written by MARIE.. VIVAS and published by . This book was released on 1997 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: PARCE QU'IL PRESENTE UN BON COMPROMIS ENTRE LES PROPRIETES MECANIQUES ET LA TENUE A LA CORROSION AINSI QU'UNE BONNE SOUDABILITE, L'ALLIAGE D'ALUMINIUM 6056 (ALMGSICUZR) EST UN EXCELLENT CANDIDAT POUR CONSTITUER LE FUSELAGE DES FUTURS AVIONS. DANS CE TYPE D'ALLIAGE, LE DURCISSEMENT STRUCTURAL EST REALISE GRACE A UNE GRANDE DENSITE DE PRECIPITES DE TAILLE NANOMETRIQUE. L'OBJET DE CETTE THESE EST L'ETUDE DE LA MICROSTRUCTURE ET DES MECANISMES ELEMENTAIRES DE LA DEFORMATION RESPONSABLES DES BONNES PROPRIETES MECANIQUES DE CE MATERIAU. CETTE ETUDE FINANCEE PAR LA REGION MIDI-PYRENNEES DANS LE CADRE DU LABORATOIRE MIXTE LRAMSA EST REALISEE PAR LE CEMES ET L'ECOLE DES MINES D'ALBI-CARMAUX EN COLLABORATION AVEC PECHINEY ET L'AEROSPATIALE. PLUSIEURS TECHNIQUES DE MICROSCOPIE ELECTRONIQUE A TRANSMISSION (MET) ONT ETE UTILISEES. LA TECHNIQUE DE MICROSCOPIE ELECTRONIQUE EN TRANSMISSION A HAUTE-RESOLUTION (MEHR) A PERMIS DE CARACTERISER LA MORPHOLOGIE DES PRECIPITES (AIGUILLES ET LATTES). LA TECHNIQUE DE MET CONVENTIONNELLE PERMET L'ETUDE DES PAYSAGES DE DISLOCATIONS ISSUES DE LA DEFORMATION. LA TECHNIQUE DE DEFORMATION IN SITU DANS LE MET, NOUS A PERMIS D'ETUDIER QUANTITATIVEMENT LES MECANISMES ELEMENTAIRES DE CISAILLEMENT ET DE CONTOURNEMENT DES PRECIPITES. CETTE TECHNIQUE PERMET D'OBTENIR LES DEUX PARAMETRES IMPORTANTS INTERVENANT DANS LE DURCISSEMENT STRUCTURAL : LA RESISTANCE MAXIMALE DES PRECIPITES AU CISAILLEMENT PAR DES DISLOCATIONS ET LA DISTANCE ENTRE PRECIPITES LE LONG D'UNE DISLOCATION SOUS CONTRAINTE. CES DEUX PARAMETRES MICROSTRUCTURAUX SONT DIRECTEMENT LIES A LA LIMITE ELASTIQUE DU MATERIAU QUI A ETE MESUREE A PARTIR D'ESSAIS DE TRACTION. D'AUTRE PART, LA CONFRONTATION DES RESULTATS OBTENUS PAR LES TROIS TECHNIQUES DE MET EMPLOYEES A PERMIS D'IDENTIFIER LES ELEMENTS DE LA MICROSTRUCTURE CONTRIBUANT REELLEMENT AUX BONNES PROPRIETES MECANIQUES DE L'ALLIAGE.

Download or read book Ceramic Materials written by Philippe Boch and published by John Wiley & Sons. This book was released on 2010-01-05 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is primarily an introduction to the vast family of ceramic materials. The first part is devoted to the basics of ceramics and processes: raw materials, powders synthesis, shaping and sintering. It discusses traditional ceramics as well as “technical” ceramics – both oxide and non-oxide – which have multiple developments. The second part focuses on properties and applications, and discusses both structural and functional ceramics, including bioceramics. The fields of abrasion, cutting and tribology illustrate the importance of mechanical properties. It also deals with the questions/answers of a ceramicist regarding electronuclear technology. As chemistry is an essential discipline for ceramicists, the book shows, in particular, what soft chemistry can contribute as a result of sol-gel methods.

Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Nanodevices for Microwave and Millimeter Wave Applications written by Isabelle Huynen and published by MDPI. This book was released on 2020-06-16 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: The microwave and millimeter wave frequency range is nowadays widely exploited in a large variety of fields including (wireless) communications, security, radar, spectroscopy, but also astronomy and biomedical, to name a few. This Special Issue focuses on the interaction between the nanoscale dimensions and centimeter to millimeter wavelengths. This interaction has been proven to be efficient for the design and fabrication of devices showing enhanced performance. Novel contributions are welcome in the field of devices based on nanoscaled geometries and materials. Applications cover, but not are limited to, electronics, sensors, signal processing, imaging and metrology, all exploiting nanoscale/nanotechnology at microwave and millimeter waves. Contributions can take the form of short communications, regular or review papers.

Download or read book Nonlinear Optical Materials written by Jerome V. Moloney and published by Springer Science & Business Media. This book was released on 1998-08-13 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer. This book was released on 1976 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Mechanics of Solid Interfaces written by Muriel Braccini and published by John Wiley & Sons. This book was released on 2013-05-21 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: The growing occurrence of heterogeneous materials such as composites or coated substrates in structural parts makes it necessary for designers and scientists to deal with the specific features of the mechanical behavior of solid interfaces. This book introduces basic concepts on mechanical problems related to the presence of solid/solid interfaces and their practical applications. The various topics discussed here are the mechanical characterization of interfaces, the initiation and growth of cracks along interfaces, the origin and control of interface adhesion, focusing in particular on thin films on substrate systems. It is designed and structured to provide a solid background in the mechanics of heterogeneous materials to help students in materials science, as well as scientists and engineers.

Download or read book Fundamentals of Ceramic Powder Processing and Synthesis written by Terry A. Ring and published by Elsevier. This book was released on 1996-04-30 with total page 985 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ceramic powder synthesis and processing are two of the most important technologies in chemical engineering and the ceramics-related area of materials science. This book covers both the processing and the synthesis ofceramic powders in great depth and is indeed the only up-to-date, comprehensive source on the subject available.The application of modern scientific and engineering methods to the field of ceramic powder synthesis has resulted in much greater control of properties. Fundamentals of Ceramic Powder Processing and Synthesis presents examples of these modern methods as they apply to ceramic powders. The book is organized to describe the natural and synthetic raw materials that comprise contemporary ceramics. It covers the three reactant processes used in synthetic ceramic powder synthesis: solid, liquid, andgas.Ceramic powder processing, as a field of materials processing, is undergoing rapid expansion. The present volume is intended as a complete and useful source on this subject of great current interest. It provides comprehensive coverage from a strong chemistry and chemical engineering perspective and is especially applicable to materials scientists, chemical engineers, and applied chemists.Key Features* The most complete and updated reference source on the subject* Comprehensive coverage from a stron chemical engineering and chemistry perspective* Emphasis on both natural and synthetic raw materials in ceramic powder synthesis* Information on reaction kinetics* Superior, more comprehensive coverage than that in existing texts* Sample problems and exercises* Problems at the end of each chapter which supplement the material

Download or read book OQAM FBMC for Future Wireless Communications written by Tao Jiang and published by Academic Press. This book was released on 2017-09-13 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: OQAM/FBMC for Future Wireless Communications: Principles, Technologies and Applications introduces the concepts and key technologies of OQAM/FBMC, which has been regarded as the potential physical layer technique in future wireless communication systems. It comprises 10 chapters that provide an overview of wireless communications, introduce wireless channels, single carrier and multicarrier modulations, and three types of FBMC systems, also comparing OQAM/FBMC with OFDM. Other chapters introduce the OQAM/FBMC communication system model, the FFT implementation, CP insertion, PSD analysis, prototype filter optimization, joint PAPR reduction and sidelobe suppression, overhead reduction with virtual symbols, time and frequency domain channel estimations, block-wise SFBC for MIMO OQAM/FBMC, and much more. - Provides a comprehensive guide to most major OQAM/FBMC techniques - Includes a detailed comparison between OFDM and OQAM/FBMC - Provides readers with a complete introduction to OQAM/FBMC, from the transmitter to the receiver - Gives readers an up-to-date view of future mobile communications and how QAM/FBMC supports them

Download or read book Plasticity and Fracture written by Wolfgang Brocks and published by Springer. This book was released on 2017-08-16 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is based on 40 years of research and teaching in the fields of fracture mechanics and plasticity. It will bring students and engineers from various disciplines up to date on key concepts that have become increasingly important in the design of safety-relevant engineering structures in general and in modern lightweight structures in the transportation industry in particular. Primarily intended for graduate students in the engineering sciences and practicing structural engineers, it employs a multidisciplinary approach that comprises theoretical concepts, numerical methods, and experimental techniques. In addition, it includes a wealth of analytical and numerical examples, used to illustrate the applications of the concepts discussed.

Download or read book Glasses and the Vitreous State written by Jerzy Zarzycki and published by Cambridge University Press. This book was released on 1991-07-25 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an up-to-date and comprehensive coverage of the properties of glasses as materials and of the vitreous state in general. The broad coverage of the book includes a study of the methods of studying the structure, glass classification, and electrical, optical, thermal and mechanical properties of glasses.

Download or read book Fracture of Engineering Materials and Structures written by S.H. Teoh and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 930 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advances in the field of fracture of engineering materials and structures have increasingly indicated its multidisciplinary nature. This area of research now involves scientists and engineers who work in materials science, applied mathematics and mechanics, and also computer scientists. The present volume, which contains the Proceedings of the Joint FEFG/lCF International Conference on Fracture of Engineering Materials and Structures held in Singapore from the 6th to 8th of August 1991, is a testimony of this multidisciplinary nature. This International Conference was the Second Symposium of the Far East Fracture Group (FEFG) and thus provided a unique opportunity for researchers and engineers in the Far East region to exchange and acquire knowledge of new advances and applications in fracture. The Conference was also the Inter-Quadrennial International Conference on Fracture (ICF) for 1991 and thus appealed to researchers in the international arena who wished to take advantage of this meeting to present their findings. The Conference has brought together over 130 participants from more than 24 countries, and they represented government and industrial research laboratories as well as academic institutions. It has thus achieved its objective of bringing together scientists and engineers with different backgrounds and perspectives but with . a common interest in new developments in the fracture of engineering materials and structures. This volume contains 4 keynote papers, 4 invited papers and 130 contributed papers.

Download or read book Elements of Ceramics written by F. H. Norton and published by . This book was released on 1991-01-01 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structure and Properties of Ceramics written by A. Koller and published by . This book was released on 1994-06-03 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern ceramic materials differ from the traditional materials which were only based on natural substances. It is now possible to prepare ceramics using a wide range of properties and as an area this field has evolved as a very broad scientific and technical field in its own right. In practice one encounters ceramics in practically all branches of materials science and the characteristics are so wide ranging that the common basis of these substances is not always immediately apparent. All ceramic materials are prepared by ceramic technology, and powder substances are used as the initial raw materials. Their physical properties are an expression not only of their composition, but primarily of their structure. Thus in order to fully understand the properties of ceramics, a knowledge of their structure is essential. This book is intended as a source of such knowledge. All the chapters are written by authors with vast experience in the various fields of ceramics who provide a detailed description of the interrelationships between the structure and behaviour of ceramic materials.

Download or read book Nonnegative Matrix Factorization written by Nicolas Gillis and published by SIAM. This book was released on 2020-12-18 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonnegative matrix factorization (NMF) in its modern form has become a standard tool in the analysis of high-dimensional data sets. This book provides a comprehensive and up-to-date account of the most important aspects of the NMF problem and is the first to detail its theoretical aspects, including geometric interpretation, nonnegative rank, complexity, and uniqueness. It explains why understanding these theoretical insights is key to using this computational tool effectively and meaningfully. Nonnegative Matrix Factorization is accessible to a wide audience and is ideal for anyone interested in the workings of NMF. It discusses some new results on the nonnegative rank and the identifiability of NMF and makes available MATLAB codes for readers to run the numerical examples presented in the book. Graduate students starting to work on NMF and researchers interested in better understanding the NMF problem and how they can use it will find this book useful. It can be used in advanced undergraduate and graduate-level courses on numerical linear algebra and on advanced topics in numerical linear algebra and requires only a basic knowledge of linear algebra and optimization.

Download or read book Structure and Properties of MgO and Al2O3 Ceramics written by W. D. Kingery and published by . This book was released on 1984 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt: