Now showing items 69-88 of 121

    • Ni INSERTION EFFECT ON THE ELECTRONIC PROPERTIES OF ZnS: DFT STUDY 

      CHAFI, Z; MESBAHI, M (Université des Frères Mentouri Constantine, 2013-12-16)
      The present study examines the atomic insertion of Ni on ZnS bulk and focuses on the ZnS and Ni-ZnS electronic properties. For this purpose we used the Wien2k code based on the theory of density functional theory (DFT). ...
    • NUMERICAL MODELING AND MEASUREMENT OF SURFACE POTENTIAL DECAY OF CORONA CHARGED BIOMEDICAL POLYMER 

      HITOUM, N; SAHLI, S; ZIARI, Z; BELLEL, A (Université des Frères Mentouri Constantine, 2013-12-16)
      Among the most used techniques in the electrical activation and surface functionalization of dielectric materials, the corona discharge is the most simple and attractive to implement. By using this electrostatic technique ...
    • OPTICAL SENSORS FOR GAS SENSING USING ZnO THIN FILM DOPED IN ALUMINUM 

      HABIA, M.I; AYADI, KH; MANALLAH, AI (Université des Frères Mentouri Constantine, 2013-12-16)
      Surface plasmon based optical sensors have attracted a great interest in the last 10 years mostly for biochemical or biomedical applications. Refractive index variations in the probed optical medium are rapidly observed ...
    • PERSPECTIVE DE CONCEPTION D’UN IMMUNOCAPTEUR A BASE DE NANOPARTICULES D’OR 

      CHABANE SARI, S.M; ZERGOU, S (Université des Frères Mentouri Constantine, 2013-12-16)
      La synthèse de nanoparticules par réduction chimique est la technique la plus utilisée pour former des solutions colloïdales de nanoparticules métalliques. De plus, parmi toutes les techniques de synthèse, elle offre le ...
    • PHASE TRANSFORMATION IN PORCELAIN FIRED AND PORCELAIN RAW ALGERIAN MATERIALS 

      KITOUNI, S; HARABI, A (Université des Frères Mentouri Constantine, 2013-12-16)
      This work presents an investigation that was undertaken for four formulations of porcelain. Compositions prepared by mixing materials such as kaolin, quartz, potash feldspar and talc, were investigated. Results are ...
    • PHÉNOMÈNE DE RECRISTALLISATION DANS L’ALLIAGE AU4G 

      GUESSOUM, M; RAHO, A; YOUSFI, H (Université des Frères Mentouri Constantine, 2013-12-16)
      Le présent travail, à caractère expérimental, porte sur l’étude de phénomènes de recristallisation dans l’alliage AU4G. L’étude expérimentale est consacrée à l’observation des grains, joints de grains ainsi que les gros ...
    • PREPARATION ET CARACTERISATIONS DE FILMS NANOCOMPOSITES D’AEROGEL DE ZnO DISPERSES DANS LA SILICE 

      SLIMI, O; DJOUADI, D; CHELOUCHE, A; AKSAS, A (Université des Frères Mentouri Constantine, 2013-12-16)
      Des films nanocomposites formés par des particules d’aérogel de ZnO dispersées dans une matrice de silice et déposés par les techniques dip-coating et spincoating ont été élaborés. L’aérogel de ZnO a été synthétisé par ...
    • PREPARATION OF Cu2ZnSnS4 THIN fiLMS BY ULTRASONIC SPRAY METHOD 

      DARANFED, W; AIDA, M.S; ATTAF, N (Université des Frères Mentouri Constantine, 2013-12-16)
      In the present work we report the details of the preparation and characterization results of Cu2ZnSnS4 (CZTS) based solar cells. The CZTS absorber was elaborated by spray ultrasonic method has been investigated. Samples ...
    • PREPARATION OF ZINC SULFIDE THIN FILM BY CHEMICAL BATH DEPOSITION 

      LEKIKET, H; AIDAAND, M.S (Université des Frères Mentouri Constantine, 2013-12-16)
      ZnS thin films have been deposited on glass slide substrates by the chemical bath deposition method at 80 °C for 60 min. The solutions in the reaction bath were prepared from ZnSO4 7H2O, SC(NH2)2, NH3 and N2H4. The ...
    • PREPARATIONS OF Nd:TiO2 AS LASER ACTIVE MEDIUM VIA SOL-GEL TECHNIQUE 

      ALWAN HAMZA, MOHAMMED; NASRO SAIOF, FAWAZ; SALEH AL EITHAWEE, ADNAN (Université des Frères Mentouri Constantine, 2013-12-16)
      Pure and Nd3+ doped Nanotitania are successfully prepared by wet chemical synthesis method. Samples were analyzed by a variety of techniques, including X-ray diffraction, FTIR, absorption and emission spectrometer to ...
    • PRESSURE EFFECT ON THE DIELECTRIC PROPERTIES OF THE ZINC-BLENDE ZnSxSe1-x 

      KHEDIRI, F; BECHIRI, A; BENMAKHLOUF, F (Université des Frères Mentouri Constantine, 2013-12-16)
      Dielectric properties of the semiconductor alloy ZnSxSe1-x and its binary compounds ZnS, ZnSe under the normal and hydrostatic pressure are calculated by the empirical pseudopotential method (E.P.M) associated with the ...
    • PROPERTIES OF ZnO/ Fe2O3 NANOCOMPOSITES THIN FILMS PREPARED BY SOL GEL METHOD WITH DIFFERENTCONCENTRATIONS AND THICKNESS 

      BAOUNI, L; BOUDJADAR, S; DJEHA, L; AMARA, S (Université des Frères Mentouri Constantine, 2013-12-16)
      ZnO/Fe2O3 nanocomposites thin films with different thickness and concentration were prepared by sol-gel dip-coating technique on glass substrates a nd the structural and optical properties of these films were studied by ...
    • PROPRIETES ELECTRIQUES D’UNE DIODE SCHOTTKY A BASE DE NITRURE DE GALIUM MASSIF 

      BELKADI, N; RABHI, A (Université des Frères Mentouri Constantine, 2013-12-16)
      Nous présentons les résultats des caractérisations électriques courant-tension et capacité-tension de la mise en oeuvre d’un procédé de réalisation de diode Schottky sur du nitrure de gallium massif dopé n. Nous avons ...
    • PROPRIETES STRUCTURAL ET ENTHALPIE DE FORMATION DE MgH2: MT (MT= Y, Zr, Nb) POUR LE STOCKAGE D’HYDROGENE 

      DJELLAB, S; BOUHADDA, Y (Université des Frères Mentouri Constantine, 2013-12-16)
      The effect of minor addition of 4d elements on the formation enthalpy (ΔH) of MgH2 has been studied using first-principle calculations. The results indicate that the partial substitution of Mg atoms by transition metal ...
    • PROPRIÉTÉS DE SURFACE DU COMPOSÉ INTERMÉTALLIQUE CENI5 APRÈS HYDROGÉNATION 

      ROUSTILA, A; CHENE, J (Université des Frères Mentouri Constantine, 2013-12-16)
      L’hydrogénation cathodique du composé intermétallique CeNi5 favorise la formation d’un hydrure métastable à la température ambiante. Les observations métallographiques indiquent que l’hydrure se forme et se développe ...
    • QUASICRYSTAL FORMATION IN MAGNETIC INDUCTION MELTED Al80Cu14Fe6 ALLOY 

      BOULARAS, H; DEBILI, M.Y; ALLEG, S; SUNOL, J.J (Université des Frères Mentouri Constantine, 2013-12-16)
      In this study, the alloy with nominal composition of Al80Cu14Fe6 is prepared by magnetic induction melting. A combination of X-ray diffraction (XRD) and scanning electron microscopy(SEM) has been used to characterize the ...
    • QUENCHING TEMPERATURE EFFECT ON PRECIPITATION KINETICS IN Al-Mg-Si ALLOY 

      LEMMADI, FATIMA Z; CHALA, ABDELOUHED; FERHATI, SAMIHA; BENRAMACHE, SAID (Université des Frères Mentouri Constantine, 2013-12-16)
      In this paper, we have studied the ageing effect before and after quenching at two temperature of 400 and 500 °C of Al 6000 alloy. The Al 6000 alloy was aged at 300 °C for 48 hours. The structural properties were ...
    • ROLE OF THE MICROSTRUCTURE ON DIELECTRIC BREAKDOWN OF ALUMINA 

      TALBI, F; LALAM, F; TALBI, S; MALEC, D (Université des Frères Mentouri Constantine, 2013-12-16)
      The dielectrics breakdown tests of monocrystalline and polycrystalline alumina samples were performed. The results point the influence of the microstructure on dielectric breakdown strength determined using the Weibull ...
    • SEMI-CONDUCTING (HALF-METALLIC) FERROMAGNETISM IN Mn(Fe) SUBSTITUTED Pt AND Pd NITRIDES 

      ABDESALEM, HOUARI; VOLKER, EYERT; MATAR, SAMIR (Université des Frères Mentouri Constantine, 2013-12-16)
      We propose a class of so far unexplored diluted ferromagnetic semiconductors and half-metals. These latter may be very interesting as a potential candidates for spintronic applications. Here, we study the electronic ...
    • SIMULATION 3D THERMIQUE LORS D’UNE OPERATION DU SOUDAGE TIG 

      ZITOUNI, AB.H; BOUKRAA, M; BENKEDDA, Y (2013-12-16)
      Une simulation numérique en 3D du soudage TIG avec surface libre plane, source de chaleur mobile de forme Gaussien est menée par la méthode des éléments finis d’une tôle en acier inoxydable 304L. Nous avons implanté notre ...