Download or read book CONTRIBUTION A L ETUDE DES INTERACTIONS ARC ELECTRODES written by AKO MATHURIN.. GOUEGA and published by . This book was released on 1995 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES TRAVAUX EFFECTUES DANS LE CADRE DE CETTE THESE SONT CENTRES SUR L'ETUDE DES PHENOMENES APPARAISSANT LORS DE L'OUVERTURE DES CONTACTS DES APPAREILS DE COUPURE ET DE L'INFLUENCE DE DIVERS PARAMETRES SUR L'EROSION DES CONTACTS. NOUS AVONS ELABORE UN DISPOSITIF EXPERIMENTAL ELECTRONIQUE PERMETTANT D'ETUDIER L'EROSION DES MATERIAUX DE CONTACT A DISTANCE INTER-ELECTRODES CONSTANTE (EROSION DUE A L'ARC SEUL) ET DE GENERER DES CRENEAUX DE COURANT D'ARC. A L'AIDE DE CE DISPOSITIF, NOUS AVONS MONTRE L'INFLUENCE DE PLUSIEURS PARAMETRES (STRUCTURE METALLURGIQUE DES MATERIAUX DE CONTACT, DISTANCE INTER-ELECTRODES, GAZ PLASMAGENE, INTENSITE ET DUREE DU COURANT D'ARC, ETC.) SUR L'EROSION DES ELECTRODES ET SUR LA TENSION D'ARC. UN TRAVAIL D'INTERPRETATION DES MESURES D'EROSION A ETE FAIT A L'AIDE D'UNE ETUDE REALISEE EN CINEMATOGRAPHIE ULTRA-RAPIDE NOUS PERMETTANT D'OBSERVER LE PIED ET LA COLONNE D'ARC. NOUS AVONS AUSSI, DANS CE TRAVAIL, REALISE UN SYSTEME DE MESURE DE FORCE (S.M.F.) PERMETTANT LA MESURE DE LA FORCE EXERCEE SUR LES ELECTRODES. CE S.M.F. A ETE UTILISE POUR L'ELABORATION DU DISPOSITIF EXPERIMENTAL D'ETUDE DES PHENOMENES A L'OUVERTURE DES CONTACTS. NOUS AVONS FAIT LA MESURE DE LA QUANTITE TOTALE DE LIQUIDE ET DE VAPEUR CREES PAR UN ARC ELECTRIQUE SUR UNE ELECTRODE ET DES CALCULS DE MODELISATION AFIN DE DETERMINER LA VALEUR DE LA DENSITE DE PUISSANCE APPORTEE PAR L'ARC A LA SURFACE DE L'ELECTRODE PERMETTANT DE REPRODUIRE LES RESULTATS EXPERIMENTAUX
Download or read book CONTRIBUTION A L ETUDE DES INTERACTIONS ARC ELECTRODES INFLUENCE DE LA STRUCTURE METALLURGIQUE SUR LES MECANISMES D EROSION DES APPAREILS DE COUPURE written by JOEL.. DEVAUTOUR and published by . This book was released on 1992 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: AFIN DE MIEUX CERNER L'INTERACTION ENTRE UN ARC ELECTRIQUE ET UNE ELECTRODE, IL EST AVANT TOUT NECESSAIRE DE CARACTERISER LES ZONES ANODIQUES ET CATHODIQUES DE CET ARC. L'ETUDE EXPERIMENTALE PRESENTEE DANS CE MEMOIRE CONCERNE A LA FOIS L'ETUDE DE LA STRUCTURE D'UN PIED D'ARC EN CINEMATOGRAPHIE RAPIDE ET LA DETERMINATION DE LA DENSITE DE COURANT MOYENNE POUR UNE ANODE OU UNE CATHODE CONSTITUEES DE DIVERS MATERIAUX DE CONTACT. A PARTIR DE CES RESULTATS EXPERIMENTAUX, UNE MODELISATION NUMERIQUE 2D DES PHENOMENES THERMIQUES, PRENANT EN COMPTE LES CHANGEMENTS D'ETAT DU MATERIAU, A PU ETRE PROPOSEE. POUR LA VALIDER, EN PARTICULIER EN CE QUI CONCERNE LES QUANTITES DE LIQUIDE ET DE VAPEUR CREEES PAR L'ARC, UN DISPOSITIF DE TEST ORIGINAL (CONSISTANT A CENTRIFUGER LES ELECTRODES DURANT L'ARC) A ETE REALISE. L'EXPLOITATION DES RESULTATS DU CALCUL ET DE CE DISPOSITIF ONT ALORS PERMIS UNE BONNE APPROCHE DES FLUX DE DENSITE DE PUISSANCE TRANSFERES PAR L'ARC AU MATERIAU. CE MEMOIRE PROPOSE EGALEMENT UNE ETUDE EXPERIMENTALE ET THEORIQUE DES MOUVEMENTS DE METAL LIQUIDE SUR UNE ELECTRODE. POUR CELA, UNE TECHNIQUE BASEE SUR L'UTILISATION D'UN ECLAIRAGE LASER A ETE MISE AU POINT POUR FILMER LA SURFACE D'UNE ELECTRODE TOUT EN OCCULTANT LA LUMIERE DE L'ARC. L'ETUDE THEORIQUE DE CES MOUVEMENTS PERMET ALORS DE PROPOSER DIVERS MECANISMES D'EJECTION DE METAL LIQUIDE ET DE DETERMINER LE TYPE DE STRUCTURE METALLURGIQUE A METTRE EN UVRE POUR INHIBER CEUX-CI, ET DONC DIMINUER L'EROSION D'UN CONTACT
Download or read book CONTRIBUTION A L ETUDE DES INTERACTIONS ARC ELECTRODE written by JAWAD.. HAIDAR and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: UNE MEILLEURE COMPREHENSION DES PROCESSUS D'INTERACTION ARC-ELECTRODES PASSE PAR L'ANALYSE DES FORCES S'EXERCANT SUR LES ELECTRODES. UN CATALOGUE DE CES FORCES AINSI QUE DE LEURS EXPRESSIONS EST DONNE AU DEBUT DE CETTE MEMOIRE. UNE ETUDE EXPERIMENTALE SUR DES ARCS AMORCES DANS L'AIR AMBIANT ENTRE DES ELECTRODES EN CUIVRE AG CD O ET TUNGSTENE A ETE EFFECTUEE GRACE A L'ELABORATION D'UN CAPTEUR SPECIFIQUE. LES RESULTATS OBTENUS CONDUISENT A ETABLIR UN DIAGRAMME DE LA DENSITE DE COURANT EN FONCTION DES PARAMETRES DE L'ARC ET SERVENT A ETUDIER LE COMPORTEMENT DE LA PARTIE LIQUEFIEE SOUS LES PIEDS D'ARC
Download or read book Handbook of Thermal Plasmas written by Maher I. Boulos and published by Springer Nature. This book was released on 2023-02-20 with total page 1973 pages. Available in PDF, EPUB and Kindle. Book excerpt: This authoritative reference presents a comprehensive review of the evolution of plasma science and technology fundamentals over the past five decades. One of this field’s principal challenges has been its multidisciplinary nature requiring coverage of fundamental plasma physics in plasma generation, transport phenomena under high-temperature conditions, involving momentum, heat and mass transfer, and high-temperature reaction kinetics, as well as fundamentals of material science under extreme conditions. The book is structured in five distinct parts, which are presented in a reader-friendly format allowing for detailed coverage of the science base and engineering aspects of the technology including plasma generation, mathematical modeling, diagnostics, and industrial applications of thermal plasma technology. This book is an essential resource for practicing engineers, research scientists, and graduate students working in the field.
Download or read book Topical Meeting on Interactions of Low Pressure Plasmas with Solid Surfaces written by S. Vepřek and published by . This book was released on 1979 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1992 with total page 1592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 4th International Symposium on Plasma Chemistry written by S. Vepřek and published by . This book was released on 1979 with total page 864 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1994 with total page 1688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Turn taking in human communicative interaction written by Judith Holler and published by Frontiers Media SA. This book was released on 2016-05-09 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: The core use of language is in face-to-face conversation. This is characterized by rapid turn-taking. This turn-taking poses a number central puzzles for the psychology of language. Consider, for example, that in large corpora the gap between turns is on the order of 100 to 300 ms, but the latencies involved in language production require minimally between 600 ms (for a single word) or 1500 ms (for as simple sentence). This implies that participants in conversation are predicting the ends of the incoming turn and preparing in advance. But how is this done? What aspects of this prediction are done when? What happens when the prediction is wrong? What stops participants coming in too early? If the system is running on prediction, why is there consistently a mode of 100 to 300 ms in response time? The timing puzzle raises further puzzles: it seems that comprehension must run parallel with the preparation for production, but it has been presumed that there are strict cognitive limitations on more than one central process running at a time. How is this bottleneck overcome? Far from being 'easy' as some psychologists have suggested, conversation may be one of the most demanding cognitive tasks in our everyday lives. Further questions naturally arise: how do children learn to master this demanding task, and what is the developmental trajectory in this domain? Research shows that aspects of turn-taking, such as its timing, are remarkably stable across languages and cultures, but the word order of languages varies enormously. How then does prediction of the incoming turn work when the verb (often the informational nugget in a clause) is at the end? Conversely, how can production work fast enough in languages that have the verb at the beginning, thereby requiring early planning of the whole clause? What happens when one changes modality, as in sign languages – with the loss of channel constraints is turn-taking much freer? And what about face-to-face communication amongst hearing individuals – do gestures, gaze, and other body behaviors facilitate turn-taking? One can also ask the phylogenetic question: how did such a system evolve? There seem to be parallels (analogies) in duetting bird species, and in a variety of monkey species, but there is little evidence of anything like this among the great apes. All this constitutes a neglected set of problems at the heart of the psychology of language and of the language sciences. This Research Topic contributes to advancing our understanding of these problems by summarizing recent work from psycholinguists, developmental psychologists, students of dialog and conversation analysis, linguists, phoneticians, and comparative ethologists.
Download or read book The Glossary of Prosthodontic Terms written by and published by . This book was released on 1994 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1971 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Translation List written by United States. National Aeronautics and Space Administration and published by . This book was released on 1961 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1995 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Government Research Development Reports written by and published by . This book was released on 1970 with total page 1298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book INIS Atomindex written by and published by . This book was released on 1981 with total page 1234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lake Pavin written by Télesphore Sime-Ngando and published by Springer. This book was released on 2016-10-31 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book represents the first multidisciplinary scientific work on a deep volcanic maar lake in comparison with other similar temperate lakes. The syntheses of the main characteristics of Lake Pavin are, for the first time, set in a firmer footing comparative approach, encompassing regional, national, European and international aquatic science contexts. It is a unique lake because of its permanently anoxic monimolimnion, and furthermore, because of its small surface area, its substantially low human influence, and by the fact that it does not have a river inflow. The book reflects the scientific research done on the general limnology, history, origin, volcanology and geological environment as well as on the geochemistry and biogeochemical cycles. Other chapters focus on the biology and microbial ecology whereas the sedimentology and paleolimnology are also given attention. This volume will be of special interest to researchers and advanced students, primarily in the fields of limnology, biogeochemistry, and aquatic ecology.
