Contribution à l'étude thermodynamique du système Lanthane - Magnésium - Zinc (La-Mg-Zn) PDF Download
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Author: Alexandre Berche
Publisher:
ISBN:
Category :
Languages : fr
Pages : 212
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Book Description
Les alliages La-Mg-Zn, de par leurs faibles masses volumiques, sont des matériaux de structure intéressants pour l'industrie des transports. L'évolution de la stabilité des phases en température doit donc être connue. Le but de ce travail a été de mener à bien l'étude complète du diagramme de phases La-Mg-Zn dont la connaissance bibliographique n'était que fragmentaire. Pour cela, de nombreux alliages ont été élaborés et caractérisés sous atmosphère contrôlée. Les phases en présence ont été mises en évidence par Diffraction RX et microsonde. Des mesure enthalpiques ont été effectuées par calorimétrie de dissolution et comparées à des résultats obtenus par DFT. Les évolutions des équilibres avec la température ont été observées par ATD 1500K. La cohérence de l'ensemble de ces nouvelles données diagrammatiques et énergétiques rend possible l'optimisation thermodynamique du système, facilitant ainsi la mise au point de futurs alliages industriels.
Author: Alexandre Berche
Publisher:
ISBN:
Category :
Languages : fr
Pages : 212
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Book Description
Les alliages La-Mg-Zn, de par leurs faibles masses volumiques, sont des matériaux de structure intéressants pour l'industrie des transports. L'évolution de la stabilité des phases en température doit donc être connue. Le but de ce travail a été de mener à bien l'étude complète du diagramme de phases La-Mg-Zn dont la connaissance bibliographique n'était que fragmentaire. Pour cela, de nombreux alliages ont été élaborés et caractérisés sous atmosphère contrôlée. Les phases en présence ont été mises en évidence par Diffraction RX et microsonde. Des mesure enthalpiques ont été effectuées par calorimétrie de dissolution et comparées à des résultats obtenus par DFT. Les évolutions des équilibres avec la température ont été observées par ATD 1500K. La cohérence de l'ensemble de ces nouvelles données diagrammatiques et énergétiques rend possible l'optimisation thermodynamique du système, facilitant ainsi la mise au point de futurs alliages industriels.
Author: R.C. Newton
Publisher: Springer Science & Business Media
ISBN: 1461258715
Category : Science
Languages : en
Pages : 312
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Book Description
Today large numbers of geoscientists apply thermodynamic theory to solu tions of a variety of problems in earth and planetary sciences. For most problems in chemistry, the application of thermodynamics is direct and rewarding. Geoscientists, however, deal with complex inorganic and organic substances. The complexities in the nature of mineralogical substances arise due to their involved crystal structure and multicomponental character. As a result, thermochemical solutions of many geological-planetological problems should be attempted only with a clear understanding of the crystal-chemical and thermochemical character of each mineral. The subject of physical geochemistry deals with the elucidation and application of physico-chemical principles to geosciences. Thermodynamics of mineral phases and crystalline solutions form an integral part of it. Developments in mineralogic thermody namics in recent years have been very encouraging, but do not easily reach many geoscientists interested mainly in applications. This series is to provide geoscientists and planetary scientists with current information on the develop ments in thermodynamics of mineral systems, and also provide the active researcher in this rapidly developing field with a forum through which he can popularize the important conclusions of his work. In the first several volumes, we plan to publish original contributions (with an abundant supply of back ground material for the uninitiated reader) and thoughtful reviews from a number of researchers on mineralogic thermodynamics, on the application of thermochemistry to planetary phase equilibria (including meteorites), and on kinetics of geochemical reactions.
Author: OECD Nuclear Energy Agency
Publisher: Nuclear Energy Agency
ISBN:
Category : Science
Languages : en
Pages : 788
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Book Description
Author: Salvatore Califano
Publisher: Springer Science & Business Media
ISBN: 364228180X
Category : Science
Languages : en
Pages : 293
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Book Description
In this historical volume Salvatore Califano traces the developments of ideas and theories in physical and theoretical chemistry throughout the 20th century. This seldom-told narrative provides details of topics from thermodynamics to atomic structure, radioactivity and quantum chemistry. Califano’s expertise as a physical chemist allows him to judge the historical developments from the point of view of modern chemistry. This detailed and unique historical narrative is fascinating for chemists working in the fields of physical chemistry and is also a useful resource for science historians who will enjoy access to material not previously dealt with in a coherent way.
Author: U. Klein
Publisher: Springer Science & Business Media
ISBN: 9781402001000
Category : Computers
Languages : en
Pages : 290
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Book Description
Fourteen chapters provide insights into the efforts of 19th- and 20th-century scientists to construct working representations of invisible objects, such as the structural formula of a dye, a three- dimensional model of a protein, or a table conveying relationships between chemical elements. The essays focus on scientists' pragmatic use of representation, exploring the concrete ways that scientists implement sign systems as productive tools both to achieve and to shape their organizational goals. Editor Klein is associated with the Max Planck Institute for the History of Science, Berlin. Annotation copyrighted by Book News Inc., Portland, OR.
Author: Domenico M. Doronzo
Publisher: Springer
ISBN: 3030015750
Category : Science
Languages : en
Pages : 281
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Book Description
This edited volume is based on the best papers accepted for presentation during the 1st Springer Conference of the Arabian Journal of Geosciences (CAJG-1), Tunisia 2018. The book is of interest to all researchers in the fields of Mineralogy, Geochemistry, Petrology and Volcanology. The Earth's interior is a source of heat, which makes our planet unique. This source regulates the formation and evolution of rocks at larger scales, and of minerals and sediments toward smaller scales. In such context, the exploration of georesources (products) has to be related to petrogenesis (processes). This volume offers an overview of the state-of-the-art petrogenesis and exploration in, but not limited to, the Middle East and Mediterranean regions. It gives new insights into processes and products related to the Earth's interior, and associated georesources by international researchers. Main topics include: 1. Petrogenetic processes: geochemistry, geochronology and geophysical approaches 2. Surficial processes: sedimentation and facies analysis 3. Applied mineralogy and tectonics 4. Geological research applied to mineral deposits
Author: Laurent-Patrick Levy
Publisher: Springer Science & Business Media
ISBN: 3662042711
Category : Science
Languages : en
Pages : 470
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Book Description
This up-to-date work presents a modern vision of magnetism and superconductivity covering both microscopic and phenomenological aspects. The basic information is illustrated with the help of current research topics such as the quantum Hall effect or mesoscopic aspects of superconductivity.
Author: Wolfgang Hummel
Publisher: Universal-Publishers
ISBN: 1581126204
Category : Science
Languages : en
Pages : 589
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Book Description
The Nagra/PSI Chemical Thermodynamic Data Base 01/01 is an encyclopedia of thermodynamic data recommended for environmental studies. The data base focuses on elements commonly found as major solutes in natural waters, and on actinides and fission products relevant for radioactive waste disposal projects. It is the official chemical thermodynamic data base used in Swiss radioactive waste disposal projects. The detailed discussion of every number recommended in this encyclopedia is the result of a multi man-year project of the Paul Scherrer Institut (PSI), a Swiss National Lab. The five authors of this work have many years of experience in research, data base development and the application of thermodynamic data in environmental studies. The data included for many elements are based on their reviews of the basic literature. The data base also includes additional data selected by the authors from recommendations of other experts in ground- water geochemistry and of the international data base project of the Nuclear Energy Agency (NEA).This report is indispensable for every scientist working in the field of environmental studies as the comprehensive source of information on the quality of the thermodynamic data governing particular problems in environmental geochemistry, especially those concerned with the fate of hazardous substances. This enables graduate students, researchers and consultants, as well as regulators and reviewers of scientific papers to assess the scientific basis of environmental modeling studies. The encyclopedia can be used as a stand-alone source of knowledge but amplereferences are provided for readers who wish to go beyond the level of discussion in the book. An electronic version of the data base and a data base management program is available for download at our homepage (http://les.web.psi.ch/TDBbook.htm).
Author: Robert J. Lemire
Publisher: Elsevier
ISBN: 9780444503794
Category : Medical
Languages : en
Pages : 876
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Book Description
Unlike earlier books in this series, this review describes the selection of chemical thermodynamic data for species of two elements, neptunium and plutonium. Although this came about more by circumstance than design, it has allowed for a more consistent approach to chemical interpretation than might have occurred in two separate treatments. It has also drawn attention to cases where the available data do not show expected parallels, and where further work may be useful to confirm or refute apparent differences in the behaviour of neptunium and plutonium.
Author: Yan Shao
Publisher: BoD – Books on Demand
ISBN: 9535100327
Category : Science
Languages : en
Pages : 254
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Book Description
Currently the research field of electrochemical cells is a hotspot for scientists and engineers working in advanced frontlines of micro-, nano- and bio-technologies, especially for improving our systems of energy generation and conversation, health care, and environmental protection. With the efforts from the authors and readers, the theoretical and practical development will continue to be advanced and expanded.
