Proprietes physicochimiques et electriques du nitrure de silicium hydrogene prepare par decomposition plasma PDF Download

Author: Maria Bensouda
Publisher:
ISBN:
Category :
Languages : fr
Pages :

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Author: Jérôme Perrin (auteur d'une thèse de physique).)
Publisher:
ISBN:
Category :
Languages : fr
Pages : 419

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PROPRIETES PHYSICO-CHIMIQUES FONDAMENTALES ET REACTIONS ELEMENTAIRES DES ESPECES PRESENTES DANS UN PLASMA DE SILANE. ETUDE EXPERIMENTALE DES PROPRIETES ELECTRIQUES DU PLASMA MULTIPOLAIRE ET MODELISATION DE L'EQUILIBRE DE LA DECHARGE. ANALYSE DE LA DECOMPOSITION CHIMIQUE DU PLASMA EN FONCTION DES CONDITIONS DE DECHARGE. ETUDE DES MECANISMES DE CROISSANCE DE LA COUCHE DE A-SI:H PAR ELLIPSOMETRIE ET ANALYSE DES PROPRIETES OPTIQUES, CHIMIQUES ET STRUCTURELLES

Author: Gisèle Serrano
Publisher:
ISBN:
Category :
Languages : fr
Pages : 11

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CE TRAVAIL CONCERNE LES DEPOTS DE NITRURE DE SILICIUM AMORPHE HYDROGENE ASSISTES PAR PLASMA RADIOFREQUENCE, A PARTIR D'UN MELANGE GAZEUX SILANE ET AMMONIAC. L'INFLUENCE DES CONDITIONS OPERATOIRES, TELLES QUE LE RAPPORT DES DEBITS GAZEUX ET LA PUISSANCE, SUR LES PROPRIETES DU MATERIAU, A ETE ANALYSEE. LES CARACTERISTIQUES PHYSICO-CHIMIQUES DU MATERIAU ONT ETE TOUT D'ABORD ETUDIEES PAR SPECTROSCOPIE INFRAROUGE. LES SPECTRES INFRAROUGES OBTENUS PAR TRANSMISSION DIRECTE ET PAR REFLEXION, POUR DES ANGLES D'INCIDENCE DIFFERENTS ET POUR UNE LUMIERE POLARISEE PARALLELEMENT ET PERPENDICULAIREMENT, SUGGERENT UNE INTERACTION ANISOTROPIQUE FAISCEAU-ECHANTILLON, DUE PROBABLEMENT A DES MODES DE VIBRATION SUR UNE PETITE ECHELLE DE PHONONS: UN MODE PARALLELE LO (1040-1070 CM#-#1), UN MODE PARALLELE ET PERPENDICULAIRE TO (840 CM#-#1). LA SPECTROSCOPIE DE PHOTOELECTRONS PAR RAYONS X ET LES ANALYSES OPTIQUES ONT DONNE DES INFORMATIONS SUR LA COMPOSITION ATOMIQUE ET L'ENVIRONNEMENT CHIMIQUE DANS LE MATERIAU. SOUS UN POURCENTAGE DE SILANE FAIBLE ET/OU SOUS FORTE PUISSANCE, IL APPARAIT QUE L'ON TROUVE PRINCIPALEMENT DES LIAISONS N(SI#3) ET EN MOINDRE QUANTITE DES LIAISONS N-H (H#XN-SI#3#-#X) DANS LES FILMS RICHES EN AZOTE. PAR CONTRE, DANS LES FILMS RICHES EN SILICIUM, ON TROUVE DES TETRAEDRES SI(N#4), DES LIAISONS SI-H ET SI-SI, CES DERNIERES PARAISSANT LIEES AU GAP OPTIQUE. LES PROPRIETES ELECTRIQUES DES FILMS ONT ETE ENSUITE DETERMINEES ET RELIEES AUX CARACTERISTIQUES PRECEDENTES. L'ETUDE DES DENSITES DE CHARGES PIEGEES DANS LE VOLUME DU MATERIAU, DES ETATS D'INTERFACE ET DES PERTES DIELECTRIQUES, A MONTRE QU'IL ETAIT POSSIBLE SOUS CERTAINES CONDITIONS DE SYNTHETISER UN DIELECTRIQUE POSSEDANT TRES PEU DE DEFAUTS. UN MODELE RELATIF AU PIEGEAGE DES CHARGES ET PRENANT EN COMPTE LES DIFFERENTS RESULTATS EXPERIMENTAUX ET BIBLIOGRAPHIQUES, A ETE DISCUTE. LE PROBLEME DE L'ORIGINE DES CHARGES A EGALEMENT ETE SOULEVE

Author: International Atomic Energy Agency
Publisher: International Atomic Energy Agency
ISBN: 9789201063205
Category : Technology & Engineering
Languages : en
Pages : 72

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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.

Author: Agnes Buka
Publisher: World Scientific
ISBN: 1848167997
Category : Science
Languages : en
Pages : 299

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The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.

Author: Jerome V. Moloney
Publisher: Springer Science & Business Media
ISBN: 9780387985817
Category : Business & Economics
Languages : en
Pages : 270

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Book Description
Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.