Contribution à l'étude des propriétés de transport des matériaux hétérogènes isotropes et Anisotropes PDF Download
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Author: Jean-Paul Troadec
Publisher:
ISBN:
Category :
Languages : fr
Pages : 180
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Book Description
Application des théories du milieu effectif et de la percolation pour décrire les propriétés de transport de milieux aléatoires macroscopiques: Conductivité électrique, conductivité thermique, pouvoir thermoélectrique de milieux hétérogènes à 2 constituants. Résultats expérimentaux pour des mélanges de sphères conductrices et isolants. Etude théorique de la conductivité de mélanges caractérises par une anisotropie géométrique ou une anisotropie des propriétés de transport; cas particulier d'un mélange conducteur-semiconducteur pres du seuil de percolation. Etude théorique et expérimentale du pouvoir thermoélectrique des melanges isotropes et anisotropes. Etude experimental de mélanges anisotropes WTE::(2) (Semimetal)-WSE::(2) (Semiconducteur)
Author: Jean-Paul Troadec
Publisher:
ISBN:
Category :
Languages : fr
Pages : 180
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Book Description
Application des théories du milieu effectif et de la percolation pour décrire les propriétés de transport de milieux aléatoires macroscopiques: Conductivité électrique, conductivité thermique, pouvoir thermoélectrique de milieux hétérogènes à 2 constituants. Résultats expérimentaux pour des mélanges de sphères conductrices et isolants. Etude théorique de la conductivité de mélanges caractérises par une anisotropie géométrique ou une anisotropie des propriétés de transport; cas particulier d'un mélange conducteur-semiconducteur pres du seuil de percolation. Etude théorique et expérimentale du pouvoir thermoélectrique des melanges isotropes et anisotropes. Etude experimental de mélanges anisotropes WTE::(2) (Semimetal)-WSE::(2) (Semiconducteur)
Author: George Green
Publisher:
ISBN:
Category : Electricity
Languages : en
Pages : 98
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Book Description
Author: E.G. Derouane
Publisher: Springer Science & Business Media
ISBN: 9401126046
Category : Science
Languages : en
Pages : 635
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Book Description
Intensive research on zeolites, during the past thirty years, has resulted in a deep understanding of their chemistry and in a true zeolite science, including synthesis, structure, chemical and physical properties, and catalysis. These studies are the basis for the development and growth of several industrial processes applying zeolites for selective sorption, separation, and catalysis. In 1983, a NATO Advanced Study Institute was organized in Alcabideche (portugal) to establish the State-of-the-Art in Zeolite Science and Technology and to contribute to a better understanding of the structural properties of zeolites, the configurational constraints they may exert, and their effects in adsorption, diffusion, and catalysis. Since then, zeolite science has witnessed an almost exponential growth in published papers and patents, dealing with both fundamentals issues and original applications. The proposal of new procedures for zeolite synthesis, the development of novel and sophisticated physical techniques for zeolite characterization, the discovery of new zeolitic and related microporous materials, progresses in quantum chemistry and molecular modeling of zeolites, and the application of zeolites as catalysts for organic reactions have prompted increasing interest among the scientific community. An important and harmonious interaction between various domains of Physics, Chemistry, and Engineering resulted therefrom.
Author: Jacques Kornprobst
Publisher: Springer Science & Business Media
ISBN: 1402008937
Category : Medical
Languages : en
Pages : 214
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Book Description
This book describes metamorphic rock formation mechanisms in a simplified form. It presents the geometrical rules which control mineral assemblages as a function of rock composition, and provides the basis of a thermodynamical approach used for equilibrium slope calculations as well as for the evaluation of P, T stability fields of mineral associations. On the basis of several examples from the literature, the author emphasizes the relations between different metamorphic gradients and different geodynamic situations. Associated P-T-t paths are examined from several points of view including the respective roles of heat conduction and convection. Audience: This textbook will be useful to undergraduate students in geology, but also to research students and scientists needing to rapidly update their knowledge of metamorphism. It is also accessible to anybody interested in geosciences wanting to acquire a basic knowledge of the close relationships that exist between geodynamics and metamorphic processes.
Author: A.P. Legrand
Publisher: Springer Science & Business Media
ISBN: 1475796498
Category : Science
Languages : en
Pages : 503
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Book Description
Conjugated polymers suoh as polyaoetylene (CH)x polyphenylene (C6H4)x' poly thiophene (C4H2S)x' etc., which are insulators in their pristine state, can be brought to the metallic state after "doping" with ohemioal speoies whioh oan be either eleotron donors or I aoceptors. . This doping prooess involves a oharge transfer between the dopant moleoule and the polymer ohain whioh are then supposed to be spatially olose to each other. It follows that the meohanism of doping must be oonsidered as an aotual interoalation process, which will greatly affeot the struotural oharacteristios of the starting material, as well as its morphology, as has been observed during the 2 intercalation of graphite and layered compounds . In parallel with these modifioations, the band struoture of the system changes yielding a new set of eleotronio properties. It is evident therefore that the struotural and eleotronio properties are intimately related, and must be studied simultaneously in the same system to give reliable information. A great number of studies have been devoted to the structural and electronic properties of conjugated polymers after a chemical or 2 electrochemical doping process . Most of these concern the properties of the system for a given dopant concentration. With this approach a universal pioture of the polymer/dopant system is very diffioult to obtain, as a comparison between different experiments is very hazardous. On the other hand, only a small number of measurements have been performed during the continuous electroohemioal doping of various polymers.
Author: P. Misaelides
Publisher: Springer Science & Business Media
ISBN: 9780792333241
Category : Science
Languages : en
Pages : 702
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Book Description
The development of advanced materials with preselected properties is one of the main goals of materials research. Of especial interest are electronics, high-temperature and superhard materials for various applications, as well as alloys with improved wear, corrosion and mechanical resistance properties. The technical challenge connected with the production of these materials is not only associated with the development of new specialised preparation techniques but also with quality control. The energetic charged particle, electron and photon beams offer the possibility of modifying the properties of the near-surface regions of materials without seriously affecting their bulk, and provide unique analytical tools for testing their quality. Application of Particle and Laser Beams in Materials Technology provides an overview of this rapidly expanding field. Fundamental aspects concerning the interactions and collisions on atomic, nuclear and solid state scale are presented in a didactic way, along with the application of a variety of techniques for the solution of problems ranging from the development of electronics materials to corrosion research and from archaeometry to environmental protection. The book is divided into six thematic units: Fundamentals, Surface Analysis Techniques, Laser Beams in Materials Technology, Accelerator-Based Techniques in Materials Technology, Materials Modification and Synchrotron Radiation.
Author: Zahid Amjad
Publisher: Springer Science & Business Media
ISBN: 1461555175
Category : Technology & Engineering
Languages : en
Pages : 509
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Book Description
Calcium Phosphates in Biological and Industrial Systems provides a comprehensive discussion on calcium phosphates in the diverse areas of their applications. The authors are all respected specialists in their particular fields, possessing wide knowledge and experience and able to analyze recent results and relate them to their respective areas of expertise. New information, as well as a review of current concepts, highlights the individual contributions. Due to the broad scope of the subject covered and the large number of contributions, this book is divided into three parts. Whilst each section contains a basic theme, there is a considerable overlapping of ideas and approaches. This reflects the excitement and interdisciplinary nature of investigations by researchers interested in dissimilar aspects of calcium phosphates. Considering the general interest in calcium phosphates, Calcium Phosphates in Biological and Industrial Systems is directed at an audience of researchers in the fields of biology, chemistry, dentistry, geology, chemical engineering, environmental engineering, and medicine. It will also be useful to technology-focused researchers in industry whose investigations might be related directly or indirectly to calcium phosphates.
Author: Mario L. Occelli
Publisher:
ISBN:
Category : Language Arts & Disciplines
Languages : en
Pages : 672
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Book Description
This volume is a complete progress report on the various aspects of zeolite synthesis on a molecular level. It provides many examples that illustrate how zeolites can be crystallized and what the important parameters are that control crystallization. Forty-two chapters cover such topics as: crystallization techniques; gel chemistry; crystal size and morphology; the role of organic compounds; and novel synthesis procedures. It offers a complete review of zeolite synthesis as well as the latest finding in this important field. Contains benchmark contributions from many notable pioneers in the field, including R.M. Barrer, H. Robson, and Robert Milton.
Author: Jean Salençon
Publisher: John Wiley & Sons
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 184
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Book Description
Author: Jean-Paul Kurtz
Publisher: Springer Science & Business Media
ISBN: 0306483173
Category : Technology & Engineering
Languages : en
Pages : 1520
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Book Description
I am pleased to present a work which marks a milestone in the history of public works and, more precisely, in that of permanent structures—a comprehensive dictionary of Civil Engineering terms. Since the beginning of time, Man has always tried to find a means to clear the obstacles which nature erected to displace him. With the first tree trunk thrown across a river, man sought to improve the crossing structure. After the invention of the wheel, and to satisfy his thirst for conquest (Roman ways), and comfort (aqueducts), man built bridges that became a preremptory necessity to move quickly. Thus, Man started to build wooden and masonry works. With the passing centuries, the builders became masters in the art of building masonry works. Then came the Industrial Revolution and the advent of the steel (1864), which was closely followed by the invention of the reinforced concrete (1855). The need for railways and improving the road network inspired great works of crossing such as viaducts and tunnels. The boom of the railway network and the development of the car required the construction of an increasing number of new structures. This phenomenon continues today with hundreds of structures built each year throughout the world.
