Güncel Gönderiler: Fen Fakültesi
Toplam kayıt 2379, listelenen: 481-500
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Broadband asymmetric quantum-well infrared photodetector in Long-Wavelength Infrared Range (LWIR)
(2007)A theoretical investigation of a GaAs-AlGaAs infrared detector consisting of three asymmetric quantum wells is presented. Each quantum well is sensitive to yield absorption and a photoresponse at peak wavelengths of 8 µm, ... -
Structural and optical properties of Al2O3 with Si and Ge nanocrystals
(2007)Si and Ge nanocrystals were formed in Al2O3 matrix by ion implantation and subsequent annealing. The phase separation of the Si nanocrystals was observed using X-ray photoelectron spectroscopy by monitoring Si 2p electrons. ... -
Nmr spectroscopic study and dft calculations of vibrational analyses, giao NMR shieldings and 'JCH, 'Jcc spin-spin coupling constants of 1,7-diaminoheptane
(2009)Vibrational frequencies and approximate mode descriptions of 1,7-diaminoheptane (dahp) have been determined via Becke-3-Lee-Yang-Parr (B3LYP) density functional method with 6-31G(d) basis set. 'H, proton coupled and uncoupled ... -
An investigation of the Gamow-Teller 1+ states in 90Nb isotopes
(2005)In this study, based on Pyatov-Salamov method, the properties of the Gamow-Teller(GT) 1+ states in 90Nb have been investigated and the agreement of our results calculated by this method for the energy of Gamow-Teller ... -
Speech and language disorders in patients with cerebral palsy [Serebral palsi·li· hastalarda di·l ve konuşma bozukluklari]
(2004)The aim of this study was to evaluate the speech and language disorders of patients with cerebral palsy. A total of 48 patients including 23 girls and 25 boys with spastic cerebral palsy were included in the study. Thirteen ... -
Preparation and characterization of the newly synthesized metal-complexing-ligand N-methacryloylhistidine having PHEMA beads for heavy metal removal from aqueous solutions
(Wiley-V C H Verlag GMBH, 2002)The aim of this study was to investigate in detail the performance for removal of heavy metal ions of beads composed of poly(2-hydroxyethyl methacrylate) (pHEMA) to which N-methacryloyhistidine (MAH) was copolymerized. The ... -
Investigation of the structure and properties of the potentially tautomeric 5,7-dimethyl-6H-pyrrolo[3,4-d]pyridazines in the gas and aqueous phases using the AM1 and PM3/COSMO solvation method
(Elsevier Science BV, 1998)The potentially tautomeric 5.7-dimethyl-6H-pyrrolo[3,4-d]pyidazines 2H and 6H, and their fixed tautomeric forms were studied in order to predict the most stable form by the restricted Hartree-Foch approach using semiempirical ... -
Carbon synthesis in methane plasma
(Natl Inst Optoelectronics, 2007)In this paper, we report a new method to generate amorphous carbon. The growth of amorphous carbons was performed at atmospheric pressure using a high voltage pulsed power supply (20 kV and 25 kHz) under the methane flux. ... -
Spectroscopic determination of acid dissociation constants of some imidazole derivatives
(American Chemical Society, 2001)The acid dissociation constants, pK(a), of eight biologically active imidazole derivatives were determined using a spectroscopic technique. Using the obtained acid dissociation constants, attempts were made to elucidate ... -
FT-IR spectroscopic study of the Hofmann-T-d-type clathrates: Ni(1,9-diaminononane)M'(CN)(4).2G (M' = Cd or Hg, G = benzene, 1,2-dichlorobenzene or 1,4-dichlorobenzene)
(Croatian Chemical Soc, 2007)New Hofmann T-d-type clathrates in the form of Ni(1,9-diaminononane)M'(CN)(4) center dot 2G (M' = Cd or Hg, G = benzene, 1,2-dichlorobenzene or 1,4-dichlorobenzene) were prepared in powder form and their infrared spectra ... -
The determination of the thickness and optical constants of the ZnO crystalline thin film by using envelope method
(Natl Inst Optoelectronics, 2006)ZnO crystalline thin film has been deposited onto glass substrates by the spray pyrolysis method. The crystallographic structure of the film and the size of the crystallites in the film were studied by X-ray diffraction. ... -
Hamilton formulation for the analysis of RLC circuits
(Physics Essays Publication, 2002)The Hamiltonian formulation well known in classical mechanics is applied to RLC circuits. The flux linkages for the inductances are assumed to be the generalized momenta (conjugate momenta), and the Hamiltonian function ... -
The effect of deposition parameters on the physical properties of CdxZn1-xS films deposited by spray pyrolysis method
(Natl Inst Optoelectronics, 2007)The spray pyrolysis method for the deposition of thin solid films is a good method for the preparation of thin films suitable for scientific studies and for many applications in technology and industry. This method was ... -
Optical characterization of the CdZn(S1-xSex)(2) thin films deposited by spray pyrolysis method
(Technical University Wroclaw, 2006)CdZn(S1-xSex)(2) thin films have been deposited onto glass substrates by the spray pyrolysis method at a 275 degrees C substrate temperature. The average optical transmittance of all the films was over 65% in the wavelength ... -
Biquaternionic representations of angular momentum and Dirac equation
(Slovak Acad Sciences Inst Physics, 2003)In the present article, after defining biquaternions, the general properties of biquaternion's algebra are introduced. The matrix representations of biquaternions are presented, as well. Then, the biquaternionic angular ... -
The quaternionic energy conservation equation for acoustic
(Slovak Acad Sciences Inst Physics, 2003)After introducing the quaternions and its algebra, the equations of the linear acoustics are defined. The local conservation equation for energy of the linear acoustics using quaternions and a quaternionic first-order ... -
Structural stabilities of water-soluble MnTDCSPP, MnTSPP, and supported analogues toward hydrogen peroxide and sodium hypochlorite
(Wiley-Blackwell, 2000)This article describes the structural stabilities of 5,10,15,20-tetrakis(2.6-dichloro-3-sulfonatophenyl)porphinatomanganese(III) X (X: OH-. H2O) (MnTDCSPP), 5,10,15,20-tetra(4-sulfonatophenyl)porphinatomanganese(III) X (X: ... -
Determination of the electron effective mass of 2D electrons in AlGaN/AlN/GaN heterostructure by Raman-scattering measurements
(Natl Inst Optoelectronics, 2012)The electron effective mass in AlGaN/AlN/GaN heterostructure grown by the metalorganic chemical vapor deposition (MOCVD) technique was determined from the phonon-plasmon coupled-mode line-shape analysis of vibrational ... -
Catalysis of autoxidation of 2,6-di-tert-butylphenol in water by metallophthalocyanine tetrasulfonates bound to polyelectrolyte supports
(Scientific Technical Research Council Turkey, 1996)2,6-and 2,10-Ionenes and soluble poly(vinylbenzyl)trimethylammonium chloride polyelectrolytes were synthesized and used as catalyst supports for cobalt-, iron- and copper-phthalocyanine tetrasulfonates on the autoxidation ... -
Frontier Orbital Theory and Chemical-Reactivity - the Utility of Spectroscopy and Molecular-Orbital Calculations
(Kluwer Academic Publ, 1993)…