Güncel Gönderiler: Fizik Bölümü
Toplam kayıt 666, listelenen: 441-460
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The effect of electrons and phonons scattering from interface roughness and well-width fluctuations on low-field mobility of 2DEG in GaN/AlGaN
(Elsevier Science Bv, 2004)The influence of interface roughness on the mobility of two-dimensional electrons in GaN/AlGaN HEMT structures are theoretically investigated in light of the measured mobility. Experimental mobility of 2912 cm(2)/V s at ... -
The effect of hot phonons on the drift Velocity in GaN/AlGaN two dimensional electron gas
(Elsevier Science Bv, 2004)We present the effect of hot-phonon production on the high-field drift velocity in the steady state in GaN/AlGaN heterostructures. The results are compared with a model taking into account the effect of hot phonon production ... -
Microstructure dependence of magnetic properties on electrochemically produced ternary CuCoNi alloys
(Springer, 2014)Ternary CuCoNi alloys were deposited by electrodeposition and the effect of different deposition potentials on the microstructural and magnetic properties of the alloys was investigated. The deposition potential was changed ... -
Stimulated emission and time-resolved photoluminescence in rf-sputtered ZnO thin films
(Amer Inst Physics, 2004)Stimulated emission (SE) was measured from ZnO thin films grown on c-plane sapphire by rf sputtering. Free exciton transitions were clearly observed at 10 K in the photoluminescence (PL), transmission, and reflection spectra ... -
Fast transient fluorescence method for measuring swelling and drying activation energies of a polystyrene gel
(Elsevier Science Bv, 2004)The time-resolved, fast transient fluorescence (TRF) technique which uses a strobe master system (SMS), was employed for studying swelling and drying of disc-shaped polystyrene gels. Disc-shaped gels were prepared by ... -
Doubly end-on azido bridged mixed-valence cobalt trinuclear complex: Spectral study, VTM, inhibitory effect and antimycobacterial activity on human carcinoma and tuberculosis cells
(Pergamon-Elsevier Science Ltd, 2015)Doubly end-on azido-bridged mixed-valence trinuclear cobalt complex, [Co-3(L)(2)(N-3)(6)(CH3OH)(2)] (1) is afforded by employing a potential monoanionic tetradentate-N2O2 Schiff base precursor (2-[{[2-(dimethylamino)ethy ... -
Pyroelectric superlattices based on copolysiloxane/calix[8]arene alternate layer LB films
(Elsevier Science Bv, 1999)The pyroelectric effect in alternate layer LB superlattices incorporating interacting lamellae of carboxyl and amino moieties has been investigated. Three distinct systems have been studied, namely (a) a copolysiloxane ... -
Numerical approaches of cluster statistics for stochastic manganese deposits
(Verlag Z Naturforsch, 2014)In terms of origin, the most important manganese deposits are sedimentary deposits which grow on the surface and/or fractures of the natural magnesite ore. They reveal various morphological characteristic according to their ... -
Range-separated hybrid density functional study of organic dye sensitizers on anatase tio2 nanowires
(Amer Chemical Soc, 2014)The adsorption of organic molecules coumarin and the donor-p-acceptor type tetrahydroquinoline (C2-1) on anatase (101) and (001) nanowires has been investigated using screened Coulomb hybrid density functional theory ... -
Langmuir-Blodgett thin film for chloroform detection
(Elsevier Science BV, 2015)Calix[4]resorcinarene (C11TEA) molecules could be deposited as an LB film by the Langmuir-Blodgett (LB) technique onto suitable substrates. Surface plasmon resonance (SPR) and UV-vis spectroscopy were employed for the ... -
GaN epitaxy on thermally treated c-plane bulk ZnO substrates with O and Zn faces
(Amer Inst Physics, 2004)ZnO is considered as a promising substrate for GaN epitaxy because of stacking match and close lattice match to GaN. Traditionally, however, it suffered from poor surface preparation which hampered epitaxial growth in ... -
Fast transient fluorescence technique for studying homopolymer mobility in a swelling gel
(2004)The mobility of pyrene end-capped polystyrene (Py-PSt) trapped in swollen polystyrene gels (PSt) was investigated. PSt gels were prepared by free radical cross-linking copolymerization (FCC) of styrene (St) and ethylene ... -
The effect of interface-roughness and dislocation scattering on low temperature mobility of 2D electron gas in GaN/AlGaN
(IOP Publishing Ltd, 2004)We present 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 ... -
Optical dispersion in spun nanocrystalline titania thin films
(Iop Publishing Ltd, 2004)Sol-gel derived titanium dioxide (TiO2) films are prepared on silicon substrates using the method of spin-coating with different speeds from 1000 to 6000 rpm. Spectroscopic ellipsometric measurements provide dispersion of ... -
Pyridine boronic acids as building blocks in crystal engineering
(Int Union Crystallography, 2005)We describe the use of different molecular tectons (building blocks), which exploit new and related synthons to generate a diverse range of crystal structures.1,2 In particular salts of protonated pyridine boronic acids ... -
Comparison of gel swelling under organic vapor and in organic solvent
(Photoenergy Center Ain Shams Univ, 2005)A Fast Transient Fluorescence Technique (FTRF) was employed for studying swelling of disc shaped poly (methyl methacrylate) (PMMA) gels, which were prepared by free radical copolymerization of methyl (methacrylate) (MMA) ... -
Sputtered fecl/cu multilayer thin films: effect of different thicknesses of cu layer
(Natl Inst Optoelectronıcs, 2014)A series of FeCl/Cu multilayer thin films was deposited with different thicknesses of Cu layer. The multilayers were sputtered with a two dc magnetrons system. The effect of different thicknesses of Cu layer on the properties ... -
Study of electrolyte ph in production of cu-co-ni ternary alloys and its effect on microstructural and magnetic properties
(Ieee-Inst Electical Electronics Engineers Inc, 2014)Cu-Co-Ni alloys were electrodeposited in the mediums that have different pH levels to investigate the microstructure-magnetic relationship. The electrolyte pH was considered as high (4.2) and low (2.5) levels. For both ... -
Hybrid functional calculated optical and electronic structures of thin anatase TiO2 nanowires with organic dye adsorbates
(Elsevier Science BV, 2015)The electronic and optical properties of thin anatase TiO2 (1 0 1) and (0 0 1) nanowires have been investigated using the screened Coulomb hybrid density functional calculations. For the bare nanowires with sub-nanometer ... -
Monte Carlo calculations of low energy positrons in silicon
(Inst Nuclear Chemistry Technology, 2005)Theoretical data for positron scattering from a thin silicon film and semi-infinite silicon are presented as a function of incident and outgoing angles and energies. These theoretical data of the scattering processes of ...
