Başlık için Fen Fakültesi listeleme
Toplam kayıt 2379, listelenen: 2330-2349
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Validated UV-Vis Spectrophotometric Method for the Determination of Copper using 2,3,4,6/-Tetrahydroxy-3/-Sulfoazobenzene in Real Samples
(Chemical Society of Pakistan, 2018)A selective and sensitive spectrophotometric method has been proposed for the determination of copper by forming red-brown chelate at pH 3.5 (3-4) with 2,3,4,6/-tetrahydroxy-3/-sulfoazobenzene (THSA). Molar absorptivity ... -
Variable selection with genetic algorithm and multivariate adaptive regression splines in the presence of multicollinearity
(Inst Advanced Science Extension, 2016)In this paper, it is aimed to determine the true regressors explaining the dependent variable in multiple linear regression models and also to find the best model by using two different approaches in the presence of low, ... -
The variation of electronic properties with the doping concentration of modulation-doped AlxGa1-xAs-GaAs double quantum wells
(Academic Press LTD Elsevier Science LTD, 2007)In this paper we have calculated the sub-band structure and the confinement potential of modulation-doped Ga1-xAlxAs-GaAs double quantum wells as a function of the doping concentration. The electronic properties of this ... -
Variation of photoluminescence from Si nanostructures in SiO2 matrix with Si+ post implantation
(2007)Si nanoclusters were formed by 28Si ion implantation into SiO2 matrix and subsequently annealed at 1050 °C for 2 h under N2 ambient. The photoluminescence (PL) characteristics depend on the 28Si fluence. The PL signals ... -
The variation of temperature-dependent carrier concentration and mobility in AlGaN/AlN/GaN heterostructure with SiN passivation
(Wiley-V C H Verlag GMBH, 2015)The effects of surface passivation effect on electron mobility and crystal structure in Al0.3Ga0.7N/AlN/GaN heterostructures are investigated by classical Hall effect measurements and an X-ray diffraction method. ... -
Variational Computations for Excitons in Quantum Dots: a Quantum Monte Carlo Study
(World Scientific Publ Co Pte LTD, 2011)A study of variational wave functions for calculation of the ground-state energies of excitons confined in a two-dimensional (2D) disc-like and three-dimensional (3D) spherical parabolic GaAs quantum dots (QDs) is presented. ... -
A vectorization for nonconvex set-valued optimization
(Scientific Technical Research Council Turkey-Tubitak, 2018)Vectorization is a technique that replaces a set-valued optimization problem with a vector optimization problem. In this work, by using an extension of the Gerstewitz function, a vectorizing function is defined to replace ... -
Vibrational and morphological properties of Sn-doped CdS films deposited by ultrasonic spray pyrolysis method
(Elsevier Sci LTD, 2010)Cd1-chi Sn chi S films (chi=0.0, 0.1 and 0.2) were prepared by the ultrasonic spray pyrolysis (USP) method on the glass substrate at 300 degrees C. Effect of Sn doping on the vibrational and morphological properties of CdS ... -
Vibrational and X-ray diffraction spectra of SnS film deposited by chemical bath deposition method
(Edp Sciences S A, 2009)Tin sulphide films have been deposited onto glass substrates at room temperature by chemical bath deposition using aqueous solution. The structural and vibrational properties of the deposited films have been characterized ... -
Vibrational investigation of 1-cyclopentylpiperazine: A combined experimental and theoretical study
(Science Press, 2014)FT-IR and Raman spectra of 1-cyclopentylpiperazine (1cppp) have been experimentally examined in the region of 4000-200 cm(-1). The optimized geometric parameters, conformational equilibria, normal mode frequencies and ... -
Vibrational spectra, DFT calculations, conformational stabilities and assignments of the fundamentals of the 1-butylpiperazine
(Elsevier Science BV, 2016)FT-IR and FT-Raman spectra of 1-butylpiperazine (1bpa) were experimentally recorded in the region of 4000-10 cm(-1) and 4000-100 cm(-1), respectively. The optimized geometric parameters, conformational equilibria, normal ... -
Vibrational spectroscopic analysis of some Hofmann-T-d type complexes
(Pergamon-Elsevier Science LTD, 2012)New Hofmann-T-d type complexes in the form of Ni(4Chpy)(2)M(CN)(4) (M = Cd or Hg and 4chpy = 4-(3-cyclohexen-1-yl)pyridine) have been prepared and their FT-IR and FT-Raman spectra have been reported. The results suggest ... -
Vibrational spectroscopic and thermal studies of some 3-phenylpropylamine complexes
(Elsevier Science BV, 2009)Four new Hofmann-3-phenylpropylamine (3PPA) type complexes with chemical formulae M(3PPA)(2)-Ni(CN)(4) (M = Ni, Co, Cd, and Pd) have been prepared and their vibrational spectra are reported in the region of 4000-60 cm(-1). ... -
Vibrational spectroscopic investigation and conformational analysis of 1-heptylamine: A comparative density functional study
(Pergamon-Elsevier Science LTD, 2013)FT-IR and Raman spectra of 1-heptylamine (1-ha) have been recorded in the region of 4000-10 cm(-1) and 4000-50 cm(-1), respectively. The conformational analysis, optimized geometric parameters, normal mode frequencies and ... -
Vibrational spectroscopic investigation of 1-pyrrolidino-1-cyclohexene: A comparative density functional study
(Pergamon-Elsevier Science LTD, 2013)Infrared and Raman spectra of 1-pyrrolidino-1-cyclohexene (1 pych) have experimentally been reported in the region of 4000-100 cm(-1). The conformational analysis, optimized geometric parameters, normal mode frequencies ... -
Vibrational spectroscopic investigation of methyl(5-[2-thienylcarbonyl]-1H-benzimidazol-2-yl: A comparative density functional study
(Maik Nauka/Interperiodica/Springer, 2014)FT-IR and Raman spectra of methyl(5-[2-thienylcarbonyl]-1H-benzimidazol-2-yl (nocodazole) are experimentally examined in the region of 4000-400 cm(-1). The optimized geometric parameters, conformational equilibria, normal ... -
Vibrational Spectroscopic Investigation of Some Hofmann-T-d Type Complexes: Ni(1-Phenylpiperazine)(2)M(CN)(4) (M = Cd or Hg)
(Chem Soc Pakistan, 2009)New Hofmann-T-d type complexes in the form of Ni(PP)(2)M(CN)(4) (where pp = I-Phenylpiperazine and M = Cd or Hg) have been prepared in powder form and their infrared (4000-100 cm(-1)) and Raman (2800-1650 cm(-1)) spectra ... -
Vibrational spectroscopic investigation of some Hofmann-Td type complexes: Ni(1-phenylpiperazine)2M(CN)4 (M = Cd or Hg)
(2009)New Hofmann-Td type complexes in the form of Ni(pp) 2M(CN)4 (where pp = 1-Phenylpiperazine and M = Cd or Hg) have been prepared in powder form and their infrared (4000-100 cm-1) and Raman (2800-1650 cm-1) spectra have been ... -
Vibrational spectroscopic study on some Hofmann type clathrates: M(1-Phenylpiperazine)(2)Ni(CN)(4)center dot 2G (M = Ni, Co and Cd; G = aniline)
(Elsevier Science BV, 2009)New Hofmann type aniline clathrates in the form of M(PP)(2)Ni(CN)(4)center dot 2G (where pp = 1-phenylpiperazine, G = aniline and M = Ni. Co and Cd) have been prepared in powder form and FT-IR and Raman spectra have been ... -
Vibrational spectroscopic study on some Hofmann type clathrates: M(2-(1-cyclohexenyl)ethylamine)(2)Ni(CN)(4)center dot 2benzene (M = Ni and Cd)
(Pergamon-Elsevier Science LTD, 2011)New Hofmann type benzene clathrates in the form of M(CyHEA)(2)Ni(CN)(4)center dot 2benzene (where CyHEA= 2-(1-cyclohexenyl)ethylamine and M=Ni or Cd) have been prepared in powder form and FT-IR and Raman spectra have been ...