Download or read book Etude de l interaction entre des alliages Ni Cr liquides et l azote written by Martin Herrera Trejo and published by . This book was released on 1991 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: En vue d'étudier l'interaction gaz-métal liquide, un dispositif expérimental a été mis en œuvre pour employer la méthode de Sieverts tant à pression constante qu'à volume constant. La solubilité de l'azote a été mesurée dans des alliages liquides Ni-Cr aux températures de 1773 et 1873 k. Les mesures ont été effectuées par la méthode à volume constant. La solubilité de l'azote augmente fortement avec la teneur en chrome et diminue avec la température. Les coefficients d'intéraction de Wagner du premier et du deuxième ordre du chrome sur l'azote dans le nickel ont été déterminés. L'effet de la présence d'aluminium sur la solubilité de l'azote dans un alliage Ni-20Cr a été étudié aux mêmes températures. La technique utilisée a été la méthode de Sieverts à pression constante. L'aluminium augmente la solubilité de l'azote. Le coefficient d'intéraction de Wagner du premier ordre de l'aluminium sur l'azote dans le nickel, et celui défini par Mori et al. Dans l'alliage Ni-20Cr, ont été déterminés. La cinétique de dénitruration d'un alliage Ni-20Cr a été étudiée dans un four à induction sous vide à l'échelle du laboratoire. Les résultats montrent que la cinétique globale est bien décrite par une expression du premier ordre. Un modèle mathématique prenant en compte la cinétique de la réaction chimique à l'interface gaz-métal liquide et le transport d'azote dans le métal, a été mis en œuvre. Il est basé sur la résolution numérique des équations de Navier-Stokes en régime turbulent, puis de l'équation de transport du soluté. Une démarche a été proposée, permettant de déterminer l'ordre et la valeur de la constante cinétique de la réaction chimique. Elle permet de déterminer le régime cinétique et l'importance relative des étapes limitantes.

Download or read book ETUDE EXPERIMENTALE ET MODELISATION MATHEMATIQUE DES CINETIQUES DE NITRURATION ET DE DENITRURATION DES ALLIAGES NICR LIQUIDES written by LAURENCE.. PETITNICOLAS BASQUIN and published by . This book was released on 1996 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'OBJECTIF DE CE TRAVAIL EST D'AMELIORER LES CONNAISSANCES RELATIVES AU TRANSFERT D'AZOTE AUX INTERFACES GAZ-METAL LIQUIDE, EN PARTICULIER DANS LE PROCEDE DE FUSION PAR INDUCTION SOUS VIDE (VIM). DEUX MOYENS ONT ETE MIS EN UVRE. D'UNE PART L'EXPERIMENTATION, REALISEE A PARTIR D'UN DISPOSITIF BASE SUR LA METHODE DE SIEVERTS, D'AUTRE PART UNE MODELISATION MATHEMATIQUE ET NUMERIQUE DU PROCEDE. L'ETUDE EXPERIMENTALE A TOUT D'ABORD PERMIS LA MESURE DE LA SOLUBILITE DE L'AZOTE DANS LES ALLIAGES NICR LIQUIDES, PUIS LA DETERMINATION DES CINETIQUES GLOBALES DE NITRURATION ET DE DENITRURATION DE CES ALLIAGES. LE MODELE MIS EN UVRE CALCULE LES FORCES ELECTROMAGNETIQUES RESPONSABLES DU BRASSAGE. LEUR CONNAISSANCE PERMET DE CALCULER L'HYDRODYNAMIQUE DU BAIN METALLIQUE EN TENANT COMPTE DE LA NATURE TURBULENTE DE MOUVEMENT. UNE ATTENTION PARTICULIERE A ETE PORTEE A LA DESCRIPTION DE LA TURBULENCE A LA SURFACE LIBRE ET DE LA FORME DE CETTE SURFACE. LA CONNAISSANCE DES VITESSES EN TOUT POINT DU BAIN PERMET DE DECRIRE LE TRANSFERT D'AZOTE (CARTES DE CONCENTRATION EN AZOTE, EVOLUTION DU TITRE MOYEN EN AZOTE AU COURS DU TEMPS) ET DE SIMULER LES EXPERIENCES DE NITRURATION ET DE DENITRURATION. UN MODELE SIMPLIFIE DE TRANSFERT DE MATIERE, BASE SUR L'HYPOTHESE DU REACTEUR PARFAITEMENT AGITE, A EGALEMENT ETE DEVELOPPE. LA COMPARAISON DE LA MODELISATION ET DE L'EXPERIMENTATION PERMET DE PRECISER LE REGIME LIMITANT LE TRANSFERT D'AZOTE. LA DEMARCHE A EGALEMENT ETE APPLIQUEE AUX REACTIONS DE DENITRURATION DANS UN FOUR VIM DE LABORATOIRE. NOUS AVONS PU METTRE EN EVIDENCE QUE, DANS LES CONDITIONS OPERATOIRES DE L'ENSEMBLE DE NOS EXPERIMENTATIONS, LE TRANSFERT D'AZOTE EST CONTROLE PAR UN REGIME CHIMIQUE. LE MODELE PEUT ETRE UTILISE PLUS GENERALEMENT POUR ETUDIER L'INTERACTION D'UN GAZ AVEC UN METAL LIQUIDE ET LES TRANSFERTS DE MATIERE AUX INTERFACES

Download or read book Frontline and Factory written by Roy MacLeod and published by Springer Science & Business Media. This book was released on 2007-05-06 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book represents a first considered attempt to study the factors that conditioned industrial chemistry for war in 1914-18. Taking a comparative perspective, it reflects on the experience of France, Germany, Austria, Russia, Britain, Italy and Russia, and points to significant similarities and differences. It looks at changing patterns in the organisation of industry, and at the emerging symbiosis between science, industry and the military.

Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.

Download or read book Theory and Technology of Quenching written by Bozidar Liscic and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 499 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat treatment of metallic alloys constitutes an important step within the production process. The heat treatment process itself is considered as a cycle of heating the workpieces to a predetermined temperature, keeping them at this temperature for the time period required, and cooling them to room temperature in an appropriate way. The process of heating and keeping workpieces at the required temperature is now adays weil mastered and mostly automatized. The process of cooling or quenching which determines actually the resulting properties, is handicapped with many physical and technical uncertainties. Good results can already be obtained predominantly by using empirically based practice. But increased demands on the properties of the pro ducts as weIl as demands on safety and environment conditions of the quenching media require efforts to investigate the details of the quenching process and to transfer the results of the research to practical application. Advances in the knowledge about quenching processes have been achieved by modem applied thermodynamics especially by the heat and mass transfer researches; further the application of computer technology was helpful to new approaches in quenching pro cesses. Special emphases has been given to: - The theory of heat transfer and heat exchange intensification during quenching - Wetting kinematics - Residual stresses after quenching - Determination of the quenching intensity - Prediction of microstructural transformation and hardness distribution after quenching, the latter with some limitations.

Download or read book Analytical Methods in the Nuclear Fuel Cycle written by and published by . This book was released on 1972 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Metals Black Book written by Michael Lash Wayman and published by . This book was released on 1998 with total page 738 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Documentation Bulletin of the National Research Centre written by and published by . This book was released on 1961 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A German English Dictionary for Chemists written by Austin M 1876-1956 Patterson and published by Scholar Select. This book was released on 2015-08-08 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Download or read book CASTI Metals Black Book written by John E. Bringas and published by . This book was released on 2003 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pandex Current Index to Scientific and Technical Literature written by and published by . This book was released on 1970 with total page 1404 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fatigue Design written by Eliahu Zahavi and published by CRC Press. This book was released on 2019-01-22 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern analytical theories of fatigue coupled with a knowledge of processing effects on metals make up the sound basis for designing machine parts that are free from unexpected failure. Fatigue Design: Life Expectancy of Machine Parts provides the information and the tools needed for optimal design. It highlights practical approaches for effectively solving fatigue problems, including minimizing the risk of hidden perils that may arise during production processes or from exposure to the environment.The material is presented with a dual approach: the excellent coverage of the theoretical aspects is accented by practical illustrations of the behavior of machine parts. The theoretical approach combines the fundamentals of solid mechanics, fatigue analysis, and crack propagation. The chapters covering fatigue theories are given special emphasis, starting with the basics and progressing to complicated multiaxial nonlinear problems.The practical approach concentrates on the effects of surface processing on fatigue life and it illustrates many faceted fatigue problems taken from case studies. The solutions demonstrate the authors' detailed analyses of failure and are intended to be used as preventive guidelines. The cases are a unique feature of the book. The numerical method used is the finite element method, and is presented with clear explanations and illustrations.Fatigue Design: Life Expectancy of Machine Parts is an extremely valuable tool for both practicing design engineers and engineering students.

Download or read book Properties of UO2 written by J. Belle and published by . This book was released on 1957 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Use of Plutonium for Power Production written by and published by . This book was released on 1965 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book In Vessel Melt Retention and Ex Vessel Corium Cooling IAEA Tecdoc No 1906 written by International Atomic Energy Agency and published by International Atomic Energy Agency. This book was released on 2020-08-06 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.

Download or read book The Boundaries of the West African Craton written by Nasser Ennih and published by Geological Society of London. This book was released on 2008 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Arsenic in Drinking Water written by National Research Council and published by National Academies Press. This book was released on 2001-11-26 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: Having safe drinking water is important to all Americans. The Environmental Protection Agency's decision in the summer of 2001 to delay implementing a new, more stringent standard for the maximum allowable level for arsenic in drinking water generated a great deal of criticism and controversy. Ultimately at issue were newer data on arsenic beyond those that had been examined in a 1999 National Research Council report. EPA asked the National Research Council for an evaluation of the new data available. The committee's analyses and conclusions are presented in Arsenic in Drinking Water: 2001 Update. New epidemiological studies are critically evaluated, as are new experimental data that provide information on how and at what level arsenic in drinking water can lead to cancer. The report's findings are consistent with those of the 1999 report that found high risks of cancer at the previous federal standard of 50 parts per billion. In fact, the new report concludes that men and women who consume water containing 3 parts per billion of arsenic daily have about a 1 in 1,000 increased risk of developing bladder or lung cancer during their lifetime.