Aide pr un code dans le cadre de mon memoire de DEA-physique [Résolu]

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3
Date d'inscription
samedi 15 novembre 2008
Statut
Membre
Dernière intervention
8 juin 2009
-
Messages postés
3
Date d'inscription
samedi 15 novembre 2008
Statut
Membre
Dernière intervention
8 juin 2009
-
Bonjour a tous,
 Je suis un jeune étudiant Camerounais en physique option Sciences des Matériaux a l'Université de Yaoundé 1.Mon sujet de mémoire porte sur la simulation de la croissance des nanocavites dans les matériaux semi conducteurs.
En fait voici l'algorithme que j'ai rédigé:
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<![endif]--> 0. Donner
le temps de recuit t et le temps d'incrémentation <gras>dt
et calculer le nombre d'itérations I = t/dt

 

 

1. Considérer une distribution de N bulles de différents
rayons. (Tu peux choisir
le type de distribution)

       

<gras><italique>        2. Faire ce qui suit <gras>I
fois successives (boucle
de 1 à I)

 

<italique>A.
Calculer la valeur moyenne des rayons.

 

B. calculer le
retrécissement  ?ri des rayons des bulles à partir de
l'équation (2).le temps d'incrémentation dt= 0.001. C'est un temps
infinitésimal.

 

C. Calculer le
nombre total ?N  de lacunes libérées à
partir de l'équation (3).

 

D. Calculer les
nouveaux rayons après retrécissement (nouvelle valeur de ri =
ancienne valeur de ri + ? ri).

 

Remarque : les points B. C. D. peuvent (doivent même)
se faire en une seule boucle, pour gagner en temps.

 

E. Tronquer toutes les cavités dont le rayon est
inférieur à un rayon seuil fixé (ce pourrait être le tiers du rayon moyen calculé en
A., comme a choisi de faire Evans. Il dit que ce critère a été retenu après de
multiples tests. Il explique pourquoi dans son papier). Compter le nombre de
cavités éliminées éventuellement et Retenir la valeur de N : le nombre
de cavités restantes.

 

F. Calculer
l’augmentation dri des rayons des cavités restantes par application
de la relation (4): en
fait les lacunes dont le nombre total ?N a été calculé en C. sont redistibuées
aux N cavités restantes.D'où l'augmentation de leur
rayons de la quantité calculée en l'équation (4).

 

G.Calculer les nouveaux rayons des N
cavités restantes (nouvelle valeur de ri = ancienne valeur de ri
calculée en D. + dri)

 

H. Solution au problème
numérique soulevé par Evans:

<!--[if !supportLists]-->-        
<!--[endif]-->SiN < ½ N initial
(c'est-à-dire la valeur de N qu'on avait en A.), alors, on génère une
nouvelle distribution ayant les mêmes caractéristique que celle en G. plus une
petite perturbation (lire les explications données par Evans).

<!--[if !supportLists]-->-        
<!--[endif]-->Sinon, on garde la distribution issue de G.

 

<gras><italique>J. On pose N = N
: on assigne à N (le nombre total de cavités)
la valeur de N et on retourne en A.

 

Ce processus
microscopique (de A. à J.) doit se répéter I fois, c'est-à-dire pendant tout le
temps de recuit.

 

<gras>        3.  Le
programme s'arrête lorsque le nombre d'itérations est égal à I.

s.v.p bien vouloir me contacter a l'adresse suivante pour avoir les équations nécessaires a l'écriture de ce programme: armandfopah@yahoo.fr

MERCI D'AVANCE A VOUS/

2 réponses

Messages postés
966
Date d'inscription
samedi 3 avril 2004
Statut
Membre
Dernière intervention
4 mars 2010
4
on va pas faire le programme à ta place...
tu poses une question sur un problème précis, code à l'appui.
Messages postés
3
Date d'inscription
samedi 15 novembre 2008
Statut
Membre
Dernière intervention
8 juin 2009

j'ai deja envoyer le code avec les questions precises...