Güncel Gönderiler: Fizik Bölümü
Toplam kayıt 1178, listelenen: 461-480
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Electrical characterisation of p-doped distributed Bragg reflectors in electrically pumped GaInNAs VCSOAs for 1.3 mu m operation
(Elsevier Science BV, 2012)The high resistivity that is encountered in p-type DBRs is an important problem in vertical cavity surface emitting lasers and optical amplifiers (VCSELs and VCSOAs). This is because the formation of potential barriers at ... -
Superconductivity in heavily compensated Mg-doped InN
(Amer Inst Physics, 2009)We report superconductivity in Mg-doped InN grown by molecular beam epitaxy. Superconductivity phase transition temperature occurs T-c=3.97 K as determined by magnetoresistance and Hall resistance measurements. The ... -
In rich In1-xGaxN: Composition dependence of longitudinal optical phonon energy
(Wiley-Blackwell, 2010)The composition dependence of longitudinal optical (LO) phonon energies in undoped and Mg-doped In1-xGaxN samples are determined using Raman spectroscopy in the range of Ga fraction from x = 0 to x = 56%. The LO phonon ... -
Performance study of SQW GaInNAs fabry-perot lasers
(Wiley-V C H Verlag GMBH, 2007)The work presented here is concerned with studies of the operational characteristics of single-quantum-well GaInNAs/GaAs Fabry-Perot lasers, where identical layer structures with differing cavity lengths are evaluated both ... -
Quantum lifetimes and momentum relaxation of electrons and holes in Ga0.7In0.3N0.015As0.985/GaAs quantum wells
(Taylor & Francis LTD, 2011)Electronic transport in n-and p-type modulation-doped Ga0.7In0.3N0.015As0.985/GaAs quantum wells are investigated using magneto-transport measurements in the temperature range between T = 1.8 and 32K and at magnetic fields ... -
Determination of the carrier density dependent electron effective mass in InN using infrared and Raman spectra
(Wiley-V C H Verlag GMBH, 2012)The vibrational properties of InN samples grown by molecular beam epitaxy (MBE) technique have been studied using infrared (IR) and Raman scattering spectroscopy at room temperature. In the Raman measurements, the 532?nm ... -
Energy Relaxation Rates in AlInN/AlN/GaN Heterostructures
(Springer, 2012)The two-dimensional (2D) electron energy relaxation in Al0.83In0.17N/AlN/GaN heterostructures has been investigated experimentally. Shubnikov-de Haas (SdH) effect measurements were employed in the investigations. The ... -
Contactless electron effective mass determination in GaInNAs/GaAs quantum wells
(Springer, 2013)The electron effective masses in n-type modulation doped Ga0.7In0.3NyAs1-y/GaAs quantum wells with nitrogen mole fractions of y = 0.004 and 0.010 were investigated experimentally. Two experimental techniques: magnetic field ... -
Effective mass of electron in monolayer graphene: Electron-phonon interaction
(Amer Inst Physics, 2013)Shubnikov-de Haas (SdH) and Hall effect measurements performed in a temperature range between 1.8 and 275 K, at an electric field up to 35 kV m(-1) and magnetic fields up to 11 T, have been used to investigate the electronic ... -
Superconductivity in MBE grown InN
(Wiley-V C H Verlag GMBH, 2011)We present the experimental investigation of superconductivity in unintentionally doped MBE grown InN samples with various InN film thicknesses. A significant change in resistivity was observed at 3.82K, for an 1080 nm InN ... -
Optical absorption and spectroscopic properties of thulium doped (TeO2)(Nb2O5)(TiO2) glasses
(Wiley-V C H Verlag GMBH, 2011)A type of thulium doped tellurite based optical glasses was prepared through conventional melt quenching technique. In the experiments, the effect of different Tm3+ ion concentration and glass composition on optical ... -
Preparation and characterization of activated carbon from waste biomass
(Elsevier Science BV, 2009)Lignocellulosic materials are good and cheap precursors for the production of activated carbon. In this study, activated carbons were prepared from the pyrolysis of soybean oil cake at 600 and 800 C by chemical activation ... -
Diaquabis[4-(dimethylamino)benzoato]-kappa O-2,O ';kappa O-(isonicotinamide-kappa N-1)cobalt(II)
(Int Union Crystallography, 2009)The title Co-II complex, [Co(C9H10NO2)(2)(C6H6N2O)(H2O)(2)], contains two 4-dimethylaminobenzoate (DMAB) anions, one isonicotinamide (INA) ligand and two coordinated water molecules. One of the DMAB anions acts as a bidentate ... -
Antimicrobial and Antioxidant Activities of Extracts and Lichen Acids Obtained From Some Umbilicaria Species From Central Anatolia, Turkey
(Wiley-Blackwell, 2013)In this study, the methanolic extracts and lichens acids obtained from six Umbilicaria species were tested for their antimicrobial activity (against three Gram-positive bacteria, five Gram-negative bacteria and two yeasts ... -
Design and Preparation of Nano-Lignin Peroxidase (NanoLiP) by Protein Block Copolymerization Approach
(MDPI AG, 2016)This study describes the preparation of nanoprotein particles having lignin peroxidase (LiP) using a photosensitive microemulsion polymerization technique. The protein-based nano block polymer was synthesized by cross-linking ... -
Activated carbons from waste biomass by sulfuric acid activation and their use on methylene blue adsorption
(Elsevier Sci LTD, 2008)Preparation of the activated carbons from sunflower oil cake by sulphuric acid activation with different impregnation ratios was carried out. Laboratory prepared activated carbons were used as adsorbents for the removal ... -
Activated Carbons From Grape Seeds By Chemical Activation With Potassium Carbonate And Potassium Hydroxide
(Elsevier, 2014)Activated carbons were produced from grape seed using either potassium carbonate (K2CO3) or potassium hydroxide (KOH). The carbonization experiments were accomplished at 600 and 800 degrees C. The effects of the experimental ... -
Thermal, Optical Properties and Structural Investigation of Tm3+ doped TeO2-ZnO-TiO2 Glass System
(E D P Sciences, 2010)Tellurite based infrared glasses in the Tm3+ doped TeO2-ZnO-TiO2 system were prepared and its optical properties and crystallization kinetics investigated by using UV-VIS-NIR spectrophometer and differential thermal analysis ... -
Investigation of Er doped zinc borate glasses by low-temperature photoluminescence
(Elsevier Science BV, 2017)Er3+ doped (95-x)B2O3-xZnO-5TiO(2) (x = 45, 50 and 55 mol%) bulk glasses were prepared by conventional melt quenching method and investigated by transmission and photoluminescence (PL) spectroscopy. Transmission spectra ... -
Biosorption of Cadmium Ions from Aqueous Solution Onto Non-living Lichen Ramalina fraxinea Biomass
(Wiley-V C H Verlag GMBH, 2009)Living lichens are known to accumulate metals across their surface. in this study, the biosorption of cadmium ions (Cd(2+)) by the lichen Ramalina fraxinea was investigated in aqueous solution in a batch system with respect ...