Contribution À L'étude Du Fluorure de Silicium Et Des Fluosilicates PDF Download

Author: Roger CAILLAT
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Roger Caillat
Publisher:
ISBN:
Category :
Languages : fr
Pages :

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Author: Abdelhak Belaidi
Publisher:
ISBN:
Category :
Languages : fr
Pages : 149

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LA DISSOLUTION ANODIQUE DU SILICIUM DE TYPE N DANS DES SOLUTIONS DE HF A ETE ETUDIEE DANS L'OBSCURITE ET SOUS ECLAIREMENT. DANS L'OBSCURITE, UN FAIBLE COURANT ANODIQUE EST OBSERVE POUR DES POTENTIELS VARIANT ENTRE 0,37 ET 4V. LA VALEUR DE CE COURANT CHANGE AVEC LE PH, LA CONCENTRATION DE FLUOR ET LA NATURE DES CATIONS PRESENTS DANS LA SOLUTION. UN MODELE SIMPLE EST PROPOSE POUR EXPLIQUER LA DEPENDANCE DU COURANT ANODIQUE EN FONCTION DE CES PARAMETRES. SOUS FAIBLE INTENSITE LUMINEUSE, LA DISSOLUTION DU SILICIUM DE TYPE N CONDUIT A LA FORMATION DU SILICIUM POREUX. SOUS FORTE INTENSITE LUMINEUSE, LE COMPORTEMENT DU SILICIUM DE TYPE N EST SIMILAIRE A CELUI DU TYPE P. LES MESURES D'IMPEDANCES ET DE SPECTROSCOPIE INFRAROUGE ONT PERMIS D'ETUDIER LA CHIMIE DE SURFACE. L'EFFET DU PH, DE LA CONCENTRATION DE FLUOR ET DE LA NATURE DES CATIONS ONT EGALEMENT FAIT L'OBJET D'UNE ANALYSE DANS CE CAS. LA DISSOLUTION ANODIQUE DU SILICIUM DE TYPE N, EN PRESENCE DU COUPLE REDOX NO +/NO, A ETE DEMONTREE DANS L'OBSCURITE. LA CHIMIE DE SURFACE PENDANT LA FORMATION DU SILICIUM POREUX PERMET DE MIEUX COMPRENDRE LES PROCESSUS INTERFACIAUX. POUR CETTE ETUDE, LES COURBES COURANT-TEMPS ET LA SPECTROSCOPIE INFRAROUGE ONT ETE UTILISEES. ON A CONCLU QUE L'OXYDE EST PRESENT PENDANT LA FORMATION DU SILICIUM POREUX. EN MEME TEMPS, LA CONCENTRATION DES LIAISONS SI-H AUGMENTE A LA SURFACE DU SILICIUM. UN MODELE BASE SUR L'EXISTENCE D'UNE SURFACE ACTIVE ELECTROCHIMIQUEMENT EST PROPOSE. CE MODELE PERMET D'EXPLIQUER LA VARIATION DE LA CONCENTRATION DES LIAISONS SI-H ET SI-O A LA SURFACE. PAR AILLEURS, L'EFFET DE L'HYDROGENE SUR LA SURFACE DU SILICIUM A ETE EXAMINE. DANS L'OBSCURITE, UNE FAIBLE DISSOLUTION DU SILICIUM S'ACCOMPAGNE DE LA FORMATION D'HYDROGENE. L'ETAT DE SURFACE OBTENU DEPEND DE LA DUREE D'IMMERSION DU SILICIUM DANS HF. L'AUGMENTATION DE LA DENSITE DES ETATS DE SURFACE PEUT S'EXPLIQUER PAR LA DIFFUSION DE L'HYDROGENE DANS LE SILICIUM.

Author: Sekou Boukadary Traore
Publisher:
ISBN:
Category :
Languages : fr
Pages : 107

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LE DOMAINE DE STABILITE ELECTROCHIMIQUE DU MELANGE EUTECTIQUE LIF-NAF-KF S'ETEND DE -2,05 A 1,10 V/E::(NI/NI(II)) A 823 K. EN COMPARANT, LES VOLTAMPEROGRAMME SIMULES AU MOYEN DE LA METHODE DE FELDBERG CONVENABLEMENT ADAPTEE AUX COURBES EXPERIMENTALES, ON PROPOSE LE MECANISME SUIVANT POUR LA REDUCTION ELECTROCHIMIQUE DU FLUOROSILICATE DE K DISSOUS DANS LE MELANGE LIF-NAF-KF: SI(IV)+2E**(-)-SI(II); SI(II)+2E-SI(0); SI(0)+SI(IV)-2SI(00) ET ON DETERMINE LA DIFFERENCE DE TENSION NORMALE E**(O)::(SI(II)/SI)-E**(O)::(SI(IV)/SI(II))= +50 MV. PAR UTILISATION DU COURANT PULSE, ON A OBTENU DES DEPOTS DE SILICIUM CRISTALLISE DONT LA TAILLE DES GRAINS (500 MU M) POURRAIT PERMETTRE LA FABRICATION DE PHOTOPILES SOLAIRES

Author: Institution of Mining and Metallurgy (Great Britain)
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 572

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Author: Don Montague
Publisher: Taylor & Francis
ISBN: 9780419199106
Category : Architecture
Languages : en
Pages : 472

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This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.

Author: Stig Sunner
Publisher: Elsevier
ISBN: 1483280896
Category : Science
Languages : en
Pages : 455

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Experimental Chemical Thermodynamics, Volume 1: Combustion Calorimetry covers the advances in calorimetric study of combustion, with particular emphasis on the accuracy of the method. This book is composed of 18 chapters, and begins with a presentation of the units and physical constants with the basic units of measurements. The succeeding chapters deal with basic principles of combustion calorimetry, emphasizing the underlying basic principles of measurement. These topics are followed by discussions on calibration of combustion calorimeters, test and auxiliary substances in combustion calorimetry, strategies in the calculation of standard-state energies of combustion from the experimentally determined quantities, and assignment of uncertainties. The final chapter considers the history of combustion calorimetry. This book will prove useful to combustion chemists and engineers, as well as researchers in the allied fields.

Author: Sandra Knowles Weller
Publisher: Caister Academic Press Limited
ISBN: 9781904455769
Category : Science
Languages : en
Pages : 0

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Alphaherpesviruses are a fascinating group of DNA viruses that includes important human pathogens such as herpes simplex virus type 1 (HSV-1), HSV-2, and varicella-zoster virus (VZV): the causative agents of cold sores, genital ulcerous disease, and chickenpox/shingles, respectively. A key attribute of these viruses is their ability to establish lifelong latent infection in the peripheral nervous system of the host. Such persistence requires subversion of the host's immune system and intrinsic antiviral defense mechanisms. Understanding the mechanisms of the immune evasion and what triggers viral reactivation is a major challenge for today's researchers. This has prompted enormous research efforts into understanding the molecular and cellular biology of these viruses. This up-to-date and comprehensive volume aims to distill the most important research in this area providing a timely overview of the field. Topics covered include: transcriptional regulation, DNA replication, translational control, virus entry and capsid assembly, the role of microRNAs in infection and oncolytic vectors for cancer therapy. In addition there is coverage of virus-host interactions, including apoptosis, subversion of host protein quality control and DNA damage response pathways, autophagy, establishment and reactivation from latency, interferon responses, immunity and vaccine development. Essential reading for everyone working with alphaherpesviruses and of interest to all virologists working on latent infections.

Author: Nawic Education Foundation
Publisher:
ISBN: 9781491730812
Category : Reference
Languages : en
Pages : 0

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An extensive listing of the terms and phrases used in construction. Included are many that are encountered daily on the jobsite or in the construction office.