LES MECANISMES DE CORROSION EN PHASE AQUEUSE DU VERRE NUCLEAIRE R7T7 APPROCHE EXPERIMENTALE. ESSAI DE MODELISATION THERMODYNAMIQUE ET CINETIQUE PDF Download
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Author: Thierry Advocat
Publisher:
ISBN:
Category :
Languages : fr
Pages : 16
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CE TRAVAIL EST UNE CONTRIBUTION A LA CONNAISSANCE DES MECANISMES ET DES VITESSES DE CORROSION EN PHASE AQUEUSE DU VERRE NUCLEAIRE R7T7. DES EXPERIENCES DE DISSOLUTION ONT ETE REALISEES DANS UNE LARGE GAMME DE PH ET DE RAPPORTS S/V (SURFACE DE VERRE/VOLUME DE SOLUTION). ON REND COMPTE DE DEUX MODES DE DISSOLUTION: EN MILIEU ACIDE, ON ASSISTE A UNE EXTRACTION PREFERENTIELLE DES ELEMENTS MODIFICATEURS DU VERRE; EN MILIEU BASIQUE, LA DISSOLUTION EST STCHIOMETRIQUE. ON OBSERVE EGALEMENT UNE AUGMENTATION DE LA VITESSE DE DISSOLUTION INITIALE DU VERRE LORSQUE LE PH AUGMENTE. LORSQUE LES RAPPORTS S/V SONT ELEVES, DES VITESSES DE DISSOLUTION FINALES ONT PU ETRE MESUREES. NOS EXPERIENCES INDIQUENT QUE LA SOLUTION TEND A S'EQUILIBRER AVEC LA SILICE DU VERRE. MAIS IL EXISTE TOUJOURS UNE AFFINITE DE DISSOLUTION NON NULLE. A 90C, LE TAUX DE DISSOLUTION DU VERRE R7T7, PROCHE ET LOIN DE L'EQUILIBRE, PEUT S'EXPRIMER PAR LA RELATION: V=1,2?10##1#4?(AH+)##0#,#3#9?(1-H4SI04/H4SI04#S#A#T). IL RESSORT EGALEMENT QUE LA VITESSE DE DISSOLUTION A LONG TERME EST SOUS LA DEPENDANCE DE NOMBREUX PARAMETRES EXTRINSEQUES. EN CE SENS, L'AFFINITE DE LA REACTION DE DISSOLUTION EST CONTEXTUELLE. DANS UNE DERNIERE PARTIE, LA DISSOLUTION DU VERRE A ETE SIMULEE GRACE AU CODE THERMOCINETIQUE KINDISS. LES CALCULS REPRODUISENT L'EXPERIENCE AVEC SATISFACTION
Author: Thierry Advocat
Publisher:
ISBN:
Category :
Languages : fr
Pages : 16
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Book Description
CE TRAVAIL EST UNE CONTRIBUTION A LA CONNAISSANCE DES MECANISMES ET DES VITESSES DE CORROSION EN PHASE AQUEUSE DU VERRE NUCLEAIRE R7T7. DES EXPERIENCES DE DISSOLUTION ONT ETE REALISEES DANS UNE LARGE GAMME DE PH ET DE RAPPORTS S/V (SURFACE DE VERRE/VOLUME DE SOLUTION). ON REND COMPTE DE DEUX MODES DE DISSOLUTION: EN MILIEU ACIDE, ON ASSISTE A UNE EXTRACTION PREFERENTIELLE DES ELEMENTS MODIFICATEURS DU VERRE; EN MILIEU BASIQUE, LA DISSOLUTION EST STCHIOMETRIQUE. ON OBSERVE EGALEMENT UNE AUGMENTATION DE LA VITESSE DE DISSOLUTION INITIALE DU VERRE LORSQUE LE PH AUGMENTE. LORSQUE LES RAPPORTS S/V SONT ELEVES, DES VITESSES DE DISSOLUTION FINALES ONT PU ETRE MESUREES. NOS EXPERIENCES INDIQUENT QUE LA SOLUTION TEND A S'EQUILIBRER AVEC LA SILICE DU VERRE. MAIS IL EXISTE TOUJOURS UNE AFFINITE DE DISSOLUTION NON NULLE. A 90C, LE TAUX DE DISSOLUTION DU VERRE R7T7, PROCHE ET LOIN DE L'EQUILIBRE, PEUT S'EXPRIMER PAR LA RELATION: V=1,2?10##1#4?(AH+)##0#,#3#9?(1-H4SI04/H4SI04#S#A#T). IL RESSORT EGALEMENT QUE LA VITESSE DE DISSOLUTION A LONG TERME EST SOUS LA DEPENDANCE DE NOMBREUX PARAMETRES EXTRINSEQUES. EN CE SENS, L'AFFINITE DE LA REACTION DE DISSOLUTION EST CONTEXTUELLE. DANS UNE DERNIERE PARTIE, LA DISSOLUTION DU VERRE A ETE SIMULEE GRACE AU CODE THERMOCINETIQUE KINDISS. LES CALCULS REPRODUISENT L'EXPERIENCE AVEC SATISFACTION
Author:
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ISBN:
Category : Environmental health
Languages : en
Pages : 546
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Author: Liqiu Wang
Publisher: Springer Science & Business Media
ISBN: 3642026907
Category : Science
Languages : en
Pages : 250
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Book Description
The term transport phenomena is used to describe processes in which mass, momentum, energy and entropy move about in matter. Advances in Transport Phenomena provide state-of-the-art expositions of major advances by theoretical, numerical and experimental studies from a molecular, microscopic, mesoscopic, macroscopic or megascopic point of view across the spectrum of transport p- nomena, from scientific enquiries to practical applications. The annual review series intends to fill the information gap between regularly published journals and university-level textbooks by providing in-depth review articles over a broader scope than in journals. The authoritative articles, contributed by international- leading scientists and practitioners, establish the state of the art, disseminate the latest research discoveries, serve as a central source of reference for fundamentals and applications of transport phenomena, and provide potential textbooks to senior undergraduate and graduate students. The series covers mass transfer, fluid mechanics, heat transfer and thermo- namics. The 2009 volume contains the four articles on biomedical, environmental and nanoscale transports. The editorial board expresses its appreciation to the c- tributing authors and reviewers who have maintained the standard associated with Advances in Transport Phenomena. We also would like to acknowledge the efforts of the staff at Springer who have made the professional and attractive pr- entation of the volume. Serial Editorial Board Editor-in-Chief Professor L. Q. Wang The University of Hong Kong, Hong Kong; lqwang@hku. hk Editors Professor A. R. Balakrishnan Indian Institute of Technology Madras, India Professor A.
Author: J. David Musgraves
Publisher: Springer Nature
ISBN: 3319937286
Category : Technology & Engineering
Languages : en
Pages : 1851
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Book Description
This handbook provides comprehensive treatment of the current state of glass science from the leading experts in the field. Opening with an enlightening contribution on the history of glass, the volume is then divided into eight parts. The first part covers fundamental properties, from the current understanding of the thermodynamics of the amorphous state, kinetics, and linear and nonlinear optical properties through colors, photosensitivity, and chemical durability. The second part provides dedicated chapters on each individual glass type, covering traditional systems like silicates and other oxide systems, as well as novel hybrid amorphous materials and spin glasses. The third part features detailed descriptions of modern characterization techniques for understanding this complex state of matter. The fourth part covers modeling, from first-principles calculations through molecular dynamics simulations, and statistical modeling. The fifth part presents a range of laboratory and industrial glass processing methods. The remaining parts cover a wide and representative range of applications areas from optics and photonics through environment, energy, architecture, and sensing. Written by the leading international experts in the field, the Springer Handbook of Glass represents an invaluable resource for graduate students through academic and industry researchers working in photonics, optoelectronics, materials science, energy, architecture, and more.
Author:
Publisher:
ISBN:
Category : Air
Languages : en
Pages : 314
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Author: Oleg V. Chudaev
Publisher: Routledge
ISBN: 1351404741
Category : Science
Languages : en
Pages : 1350
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Book Description
Water-rock interactions play an important role in nearly all physical and chemical processes operating on the Earth's surface and subsurface. This work contains the proceedings of the Eighth International Symposium on Water-Rock Interaction (WRI-8), held in Russia in 1995.
Author:
Publisher:
ISBN:
Category : Nuclear weapons
Languages : en
Pages : 556
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Author: A. Bejan
Publisher: IOS Press
ISBN: 1607503980
Category : Science
Languages : en
Pages : 188
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Book Description
Globalization, security infrastructure and energy sustainability can be designed based on a scientific principle. In this book, these objectives are approached based on constructal theory, which means to design such projects as global ‘flow’ architectures that are ‘alive’ with movement of personnel, equipment, information, education, etc. Constructal Human Dynamics, Security and Sustainability highlights the progress made during the NATO Advanced Research Workshop held in Évora, Portugal in May 2008. This workshop brought together social scientists with physicists, engineers and biologists. Together they addressed main topics such as human dynamics viewed as natural phenomena of design generation, flow networks for distribution and collection, large-scale construction projects (e.g., airports, waste storage), logistics, decontamination, energy supply routes, distributed energy systems, water resources management, environmental security sustainability and globalization. The chapters selected for this book represent the interdisciplinary approach and team atmosphere that emerged in Évora.
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ISBN:
Category : Glass waste
Languages : en
Pages : 972
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Author:
Publisher:
ISBN:
Category : Glass
Languages : en
Pages : 776
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