Güncel Gönderiler: Makale Koleksiyonu
Toplam kayıt 1058, listelenen: 201-220
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FT-IR spectroscopic study on some 4-(3-cyclohexen-1-yl)pyridine Metal(II) tetracyanonickelate complexes
(Verlag Z Naturforsch, 2005)New Hofmann-type complexes in the form of M(4-Chpy)(2)Ni(CN)(4) [where 4-Chpy = 4-(3-cyclohexen-1-yl)pyridine and M = Ni, Co] were prepared in powder form, and their infrared spectra are reported in the range of 4000-400 ... -
Tunable long-wavelength broad band asymmetric quantum well infrared photodetector
(IOP Publishing LTD, 2007)We present a theoretical investigation of a GaAs/AlGaAs infrared detector consisting of three asymmetric quantum wells. Each well is designed to yield absorption and a photoresponse at peak wavelengths of 8.2 mu m, 9.5 mu ... -
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 ... -
Preconcentration of copper using double-imprinted polymer via solid phase extraction
(Elsevier Science BV, 2006)The aim of this study is to prepare double-imprinted polymers which can be used for the selective removal of Cu(II) ions from synthetic waters. Chitosan-succinate (CS) was choosen as the metal complexing polymer. In the ... -
Phosphorus-nitrogen compounds: New spiro-cyclic phosphazene derivatives. Structure of 4 ',4 ',6 ',6 '-tetrachloro-3,4-dihydro-3-(3-methylpyridin-2-yl)-spiro-[1,3,2-benzoxazaphosphinine-2,2 '-(2 lambda(5),4 lambda(5),6 lambda(5)-cyclotriphosphazene)]. Part XII
(Elsevier Science BV, 2005)The condensation reactions of [N-[(2-hydroxyphenylmethyl)amino]-methylpyridines (5-8) with trimer, N3P3Cl6, have been afforded partially substituted novel spiro-cyclic phosphazene derivatives (9-12) (Scheme 1). Compounds ... -
The effect of the pairing interaction on the energies of isobar analogue resonances in Sb112-124 and isospin admixture in Sn100-124 isotopes
(IOP Publishing LTD, 2004)In the present study, the effect of the pairing interaction and the isovector correlation between nucleons on the properties of the isobar analogue resonances (IAR) in Sb112-124 isotopes and the isospin admixture in Sn100-124 ... -
Gamow-Teller 1(+) states in Bi-208
(Amer Physical Soc, 2005)The properties of the Gamow-Teller (GT) 1(+) states in Bi-208 have been investigated by using the Pyatov-Salamov method. The GT resonance (GTR) energy, the contribution of the GTR beta transition strength to the Ikeda sum ... -
Prediction of the acidities of organic bases in aqueous solution using AM1 COSMO solvation model
(Elsevier Science BV, 2000)Potentially tautomeric pyrazole-3-ones were studied, in order to predict their tautomeric equilibrium constants and pK(a) values, using the semiempirical AM1 COSMO solvation model at the SCF level in aqueous solution. Syn ... -
Electrochemistry coupled to fluorescence spectroscopy: a new versatile approach
(Elsevier Science Inc, 2004)The efficiency and versatility of a spectroelectrochemical cell was used in order to couple electrochemistry and fluorescence spectroscopy. This new tool was tested and validated through the study of the reduction steps ... -
A new approach to quantum well infrared photodetectors: Staircase-like quantum well and barriers
(Elsevier Science BV, 2006)We present a theoretical investigation of a novel staircase-like quantum well infrared photodetector (QWIP). The proposed structure makes use of quantum wells and barriers with increasing Al content both in the wells and ... -
Synthesis and spectroscopic characterization of new Schiff bases containing the benzo-15-crown-5 moiety
(Molecular Diversity Preservation International, 2004)New crown ether Schiff base derivatives were prepared by the condensation of 4'-formylbenzo-15-crown- 5 or 4'-formyl-5'-hydroxybenzo-15-crown-5 with 1,2-bis(2aminophenoxy)ethane. The structures of these new compounds were ... -
Comparison of adsorption and selectivity characteristics for 4-nitrophenol imprinted polymers prepared via bulk and suspension polymerization
(Marcel Dekker Inc, 2004)This manuscript describes a method for the selective removal of phenolic compounds from aqueous medium by imprinted polymers, which is the noncovalent approach based on both hydrogen bonding and hydrophobic interaction. ... -
Synthesis, structural and optical properties of novel borylated Cu(II) and Co(II) metal complexes of 4-benzylaminobiphenylglyoxime
(Elsevier Science Sa, 2007)4-Benzylaminobiphenylglyoxime ligand and its Cu(II) and Co(II) complexes were prepared. BF2+-bridge containing 4-benzylaminobiphenylglyoxime complexes were obtained by replacing of the bridging protons of the dioxime ... -
Selective separation and preconcentration of cyanide by a column packed with cyanide-imprinted polymeric microbeads
(Elsevier Science BV, 2004)Using the strategy of template polymerization, specific metal-complexing polymer which is poly(methacryloylhistidine-Ni(II)-CN-) (P(MAH-Ni(II)-CN-)) has been prepared. This polymer is able to specifically recognize the ... -
H-1 C-13 NMR and (n)J(CH) coupling constants investigation of 4-Phenylpyridine: A combined experimental and theoretical study
(Elsevier Science BV, 2007)Proton coupled and uncoupled C-13, H-1, DEPT, COSY and HETCOR NMR spectra of 4-Phenylpyridine (4-Phpy) have been reported for the first time except for its H-1 NMR spectrum. In order to provide a precise structural elucidation ... -
The determination of the optical band and optical constants of non-crystalline and crystalline ZnO thin films deposited by spray pyrolysis
(Natl Inst Optoelectronics, 2007)The optical constants and optical band gaps of the non-crystalline and crystalline zinc oxide (ZnO) thin films deposited by the spray pyrolysis method onto glass substrates at the different deposition times have been ... -
Removal of heavy metal ions by dithiocarbamate-anchored polymer/organosmectite composites
(Elsevier Science BV, 2006)In this study, the dithiocarbamate-anchored polymer/organosmectite composites were prepared for the removal of heavy metal ions (lead, cadmium and chromium) from aqueous media containing different amounts of these ions ... -
Influence of the indium incorporation on the structural and electrical properties of zinc oxide films
(Natl Inst Optoelectronics, 2006)Undoped and indium-doped ZnO films have been deposited onto glass substrates by the spray pyrolysis method. The effect of indium incorporation on structural and electrical properties of ZnO films has been investigated. ... -
Hyperbolic Octonion Formulation of Gravitational Field Equations
(Springer/Plenum Publishers, 2013)In this paper, the Maxwell-Proca type field equations of linear gravity are formulated in terms of hyperbolic octonions (split octonions). A hyperbolic octonionic gravitational wave equation with massive gravitons and ...
