Browsing Yayın Koleksiyonu by Issue Date
Now showing items 1-20 of 221
-
The effect of strain relaxation on electron transport in undoped Al0.25Ga0.75N/GaN heterostructures
(ELSEVIER SCIENCE BV, 2007)The two-dimensional electron gas (2DEG) transport properties of two-step growth undoped Al0.25Ga0.75N/GaN heterostructures with semi-insulating buffer, grown by MOCVD, were investigated in a temperature range of 20-350K. ... -
Electron transport in Ga-rich InxGa1-xN alloys
(IOP PUBLISHING LTD, 2007)Resistivity and Hall effect measurements on n-type undoped Ga-rich InxGa1-xN (0.06 <= x <= 0.135) alloys grown by metal-organic vapour phase epitaxy (MOVPE) technique are carried out as a function of temperature (15-350K). ... -
Temperature-dependent electron transport in In0.5Ga0.5P/GaAs grown by MOVPE
(IOP PUBLISHING LTD, 2007)Hall effect measurements in undoped In0.5Ga0.5P/GaAs alloy grown by metal organic vapour-phase epitaxy (MOVPE) have been carried out in the temperature range 15-350 K. The experimental results are analysed using a two-band ... -
Optimization of alloy composition, interlayer and barrier thicknesses in AlxGa1-xN/(AlN)/GaN high electron mobility transistors
(NATL INST OPTOELECTRONICS, 2007)The investigating of the GaN-based high electron mobility transistors (HEMTs) is focused to achieve two goals: increase of carrier density and mobility. Increasing the number of the carriers in the 2-dimensional-electron-gas ... -
Free Surface Effect On Displacement And Relative Interfacial Displacement Fields Of Misfit Dislocations At The Bicrystal Interface
(SPRINGER INDIA, 2007)The displacement field (u) over right arrow and the relative interfacial displacement field (Delta u) over right arrow are investigated for the material formed by two isotropic media. When one of the media tends to infinity ... -
Free surface effect on displacement and relative interfacial displacement fields of misfit dislocations at the bicrystal interface
(2007)The displacement field u› and the relative interfacial displacement field ?u› are investigated for the material formed by two isotropic media. When one of the media tends to infinity and the other one has the thickness of ... -
High temperature variable-range hopping conductivity in undoped TiO2 thin film
(NATL INST OPTOELECTRONICS, 2007)Electrical conductivity measurements in an undoped titanium dioxide thin film have been carried out as a function of temperature (180-320 K). The film has been deposited onto glass substrates by a d.c. magnetron-sputtering ... -
An experimental and theoretical study of molecular structure and vibrational spectra of pentafluorophenylboronic acid molecule by density functional theory and ab initio Hartree Fock calculations
(ELSEVIER SCIENCE BV, 2008)In this work, the Fourier transform Raman and Fourier transform infrared spectra of pentafluorophenylboronic acid (= pfpa) were recorded in the solid phase. The structural and spectroscopic analysis of the pentafluorophenylboronic ... -
Comparison of experimental and density functional study on the molecular structure, infrared and Raman spectra and vibrational assignments of 6-chloronicotinic acid
(PERGAMON-ELSEVIER SCIENCE LTD, 2008)The experimental and theoretical study on the structures and vibrations of 6-chloronicotinic acid (6-CNA, C(6)H(4)ClNO(2)) are presented. The Fourier transform infrared spectra (4000-50cm(-1)) and the Fourier transform ... -
Stokes shift and band gap bowing in InxGa1-xN (0.060 <= x <= 0.105) grown by metalorganic vapour phase epitaxy
(POLISH ACAD SCIENCES INST PHYSICS, 2008)We presented the results of electrical and optical studies of the properties of InxGa1-xN epitaxial layers (0.060 <= x <= 0.105) grown by metalorganic vapour phase epitaxy. Resistivity and Hall effect measurements of the ... -
An experimental and theoretical study of molecular structure and vibrational spectra of 3-and 4-pyridineboronic acid molecules by density functional theory calculations
(PERGAMON-ELSEVIER SCIENCE LTD, 2008)The experimental and theoretical vibrational spectra of 3- and 4-pyridineboronic acids (abbreviated as p3 and p4) were studied. The Fourier transform Raman and Fourier transform infrared spectra of p3 and p4 molecules were ... -
Electrical properties of TiO(2) thin films
(ELSEVIER SCIENCE BV, 2008)The electrical properties of n-type titanium dioxide thin films deposited by magnetron-sputtering method have been investigated by temperature-dependent conductivity. We observed that the temperature dependence of the ... -
Molecular structure and vibrational spectra of 1,3-bis(4-pyridyl)propane by quantum chemical calculations
(PERGAMON-ELSEVIER SCIENCE LTD, 2008)The experimental and theoretical study on the structures and vibrations of 1,3-bis(4-pyridyl)propane are presented. The FFAR and Raman spectra of molecule have been measured. The optimized geometric bond lengths have been ... -
An experimental and theoretical study of molecular structure and vibrational spectra of 2-chloronicotinic acid by density functional theory and ab initio Hartree-Fock calculations
(ELSEVIER SCIENCE BV, 2008)In this work, the Fourier transform Raman and Fourier transform infrared spectra of 2-chloronicotinic acid (2-CNA) are recorded in the solid phase. The molecular geometry, vibrational frequencies, infrared intensities and ... -
An ab initio constant-pressure study of pressure-induced phase transition of MgSe
(EDP SCIENCES S A, 2008)We study the pressure-induced phase transition of MgSe using a constant-pressure ab initio technique and. find that the rocksalt-structured MgSe transforms into a FeSi-type structure. Furthermore, we. find that this phase ... -
Pressure-induced phase transformation in CdO: An ab initio constant-pressure study
(EDP SCIENCES S A, 2008)A constant-pressure ab initio technique is used to study the behavior of CdO at high pressures. A phase transformation from the NaCl-type structure to the CsCl-type structure via a rhombohedral intermediate state is ... -
The effect of the increase of linear dimensions on exponents obtained by finite-size scaling relations for the four-dimensional Ising model on the Creutz cellular automaton
(WORLD SCIENTIFIC PUBL CO PTE LTD, 2008)The four-dimensional Ising model is simulated on the Creutz cellular automaton using finite-size lattices with linear dimension 4 <= L <= 22. The exponents in the finite-size scaling relations for the order parameter, the ... -
Phase transformation of 6H-SiC at high pressure: An ab initio constant-pressure study
(EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY, 2008)We apply a constant-pressure ab initio technique to investigate the high-pressure phase transformation of 6H-SiC and show that it transforms into a rocksalt structure. This phase change proceeds in two stages: 6H-SiC is ... -
X-ray, FT-Raman, FT-IR spectra and ab initio HF, DFT calculations of 2-[(5-methylisoxazol-3-yl)amino]-2-oxo-ethyl methacrylate
(ELSEVIER SCIENCE BV, 2008)Molecular structure of methacrylate monomer, 2-[(5-methylisoxazol-3-yl)amino]-2-oxo-ethyl methacrylate (IAOEMA) was determined by X-ray diffraction analysis. The molecule (IAOEMA) crystallizes in monoclinic, space group ...
