Güncel Gönderiler: Fizik Bölümü
Toplam kayıt 666, listelenen: 401-420
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DFT study of Rb/Si(100)-2 x 1 system
(Elsevier Science Bv, 2005)We have investigated Rb adsorption on the Si(100) surface for 0.5 and 1 monolayer coverages using the total energy method with norm-conserving pseudopotentials. For 2 x 1 reconstruction at 1 ML coverage symmetrized dimers ... -
Molecular alignment during gel formation from methyl methacrylate: An excimer fluorescence study
(Taylor & Francis Ltd, 2005)Glass transition during bulk polymerization was studied in free-radical cross-linking copolymerization (FCC) of methyl methacrylate (MMA) using the steady-state fluorescence (SSF) technique. Naphthalene (N) was used as a ... -
Microstructural and electrical studies on diamond films
(Pergamon-Elsevier Science Ltd, 2005)X-ray diffraction, atomic force microscopy and electrical studies were performed on 2-3 mu m thick diamond films on silicon substrates. The films were produced by the microwave plasma chemical vapour deposition method. The ... -
Poly(methyl methacrylate) films for organic vapour sensing
(Iop Publishing Ltd, 2003)Optical constants and fabrication parameters are investigated using surface plasmon resonance (SPR) studies on spun films of poly(methyl methacrylate) (PMMA) derivatives in contact with two different dielectric media. A ... -
4H-SiC photoconductive switching devices for use in high-power applications
(Amer Inst Physics, 2003)Silicon carbide is a wide-band-gap semiconductor suitable for high-power high-voltage devices and it has excellent properties for use in photoconductive semiconductor switches (PCSSs). PCSS were fabricated as planar ... -
p-GaN-i-GaN/AlGaN multiple-quantum well n-AlGaN back-illuminated ultraviolet detectors
(Minerals Metals Materials So, 2003)The spectral response of back-surface-illuminated p-GaN-i-GaN/AlGaN multiple-quantum well (MQW)-n-AlGaN ultraviolet (UV) photodetector is reported. The structure was grown by molecular-beam epitaxy on a c-plane sapphire ... -
Relation between magnetic, spectroscopic and structural properties of binuclear copper(II) complexes of pentadentate Schiff-base ligand, semi-empirical and ab-initio calculations
(Verlag Z Naturforsch, 2003)The synthesis and characterization of [Cu-2(L-1)(3,5 prz)] (L-1=1,3-Bis(2-hydroxy-3,5-chlorosalicylideneamino)propan-2-ol) 1 and of [Cu-2(L-2)(3,5 prz)] (L-2=1 3-Bis(2-hydroxy-bromosalicylideneamino)propan-2-ol) 2 are ... -
Photo-induced transient spectroscopy and in-plane photovoltage in GaInNAs/GaAs quantum wells
(Elsevier Science Bv, 2003)We have studied the optical quality of sequentially grown undoped Ga0.8In0.2As and Ga0.8In0.2N0.015As0.985 quantum wells (QWs). Spectral and time-resolved in-plane photovoltage (IPV) and photo-induced transient spectroscopy ... -
Effect of non-drifting hot phonons on high-field drift velocity in GaN/AlGaN
(Iop Publishing Ltd, 2003)We report on the studies of steady-state high-field drift velocity in GaN/AlGaN HEMT structures. The results are compared with a model taking into account the effect of hot phonon production on the high-field transport of ... -
In-plane photovoltage and photoluminescence studies in sequentially grown GaInNAs and GaInAs quantum wells
(Amer Inst Physics, 2003)We have investigated in-plane photovoltage (IPV) and photoluminescence (PL) in sequentially grown Ga0.8In0.2As/GaAs and Ga0.8In0.2N0.015As0.985/GaAs-quantum wells. Temperature, excitation intensity, spectral and time ... -
Magnetic characterization of silicon-iron magnetic material produced by a novel rotating cryostat
(Elsevier Science Bv, 2003)A rotating cryostat vacuum system has been used to deposit Si3Fe97 magnetic films. Observations indicate that in-plane magnetic anisotropy and coercivity is dependent on the type of substrate and the deposition method used. ... -
Relation between ferromagnetic layer thickness (NiCu) and properties of NiCu/Cu multilayers
(Springer, 2015)NiCu/Cu multilayers were grown on (110) textured polycrystalline Cu substrates from a single electrolyte containing Ni and Cu ions by electrodeposition. The structural, magnetic and magnetoresistance properties of the ... -
Effect of potantiostatic waveforms on properties of electrodeposited NiFe alloy films
(Springer, 2004)The influence of the deposition potentials applied in continuous and pulse waveforms on the properties of the electrodeposited NiFe alloy films have been investigated. The films were grown on ( 100) textured polycrystalline ... -
Excitonic fine structure and recombination dynamics in single-crystalline ZnO
(Amer Chemical Soc, 2004)The optical properties of a high quality bulk ZnO, thermally post treated in a forming gas environment are investigated by temperature dependent continuous wave and time-resolved photoluminescence (PL) measurements. Several ... -
Semi empirical study of a system containing a six-membered ring
(Verlag Z Naturforsch, 2004)Semi-empirical AM1 SCF-MO calculations have been used to find the structure optimization and conformational interconversion pathways of a system containing a six-membered ring. The system has the two symmetrical energy-minimum ... -
Pyroelectric effect in a mixed polysiloxane/eicosylamine Langmuir-Blodgett thin film
(Elsevier Science Bv, 2004)A pyroelectric material possessing a non-centrosymetric structure exhibits a temperature-dependent spontaneous electric polarisation, which is known as the pyroelectric effect. Organic thin film materials have been extensively ... -
The effect of scattering mechanisms on the low field mobility in GaN/AlGaN heterostructures
(Elsevier Science Bv, 2004)The effect of all standard scattering mechanisms, including scattering by acoustic and optical phonons, background impurities and dislocation, on two-dimensional electron gas (2DEG) transport in GaN/AlGaN heterostructures ... -
Thermally stimulated currents in layered Ga4SeS3 semiconductor
(Wiley-V C H Verlag Gmbh, 2004)Thermally stimulated current (TSC) measurements are carried out on nominally undoped Ga4SeS3 layered semiconductor samples with the cur-rent flowing along the c-axis in the temperature range of 10 to 150 K. The results are ... -
The effect of interface roughness scattering on low field mobility of 2D electron gas in GaN/AlGaN heterostructure
(Elsevier Science Bv, 2004)We report the results of our experimental and theoretical studies concerning the temperature dependence of electron mobility in a two dimensional electron gas (2DEG) confined at the GaN/AlGaN interface. Experimental mobility ... -
Monte-Carlo calculations of positron implantation profiles in silver and gold
(Pergamon-Elsevier Science Ltd, 2000)To investigate the implantation profiles of positrons in silver and gold, the Monte-Carlo programs developed previously by Ozmutlu and Aydin (1997) to simulate the transport of positrons in metals was used. The simulation ...
