Güncel Gönderiler: Fen Fakültesi
Toplam kayıt 2379, listelenen: 1941-1960
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A new 2,2 '-oxydianiline derivative symmetrical azomethine compound containing thiophene units: Synthesis, spectroscopic characterization (UV-Vis, FTIR, H-1 and C-13 NMR) and DFT calculations
(Elsevier Science BV, 2018)In this study, a new symmetrical azomethine compound, N,N'-oxydiphenylenebis(5-(thiophen-2-yl) salicylidenimine OPBTS (5), having two thiophene rings and N, O donor groups, was successfully prepared by a simple condensation ... -
High quantum efficiency Type-II superlattice N-structure photodetectors with thin intrinsic layers
(Spie-Int Soc Optical Engineering, 2013)We report on the development of InAs/AlSb/GaSb based N-structure superlattice pin photodiode. In this new design, AlSb layer in between InAs and GaSb layers acts as an electron barrier that pushes electron and hole wave ... -
Fourier transform technique in variational treatment of two-electron parabolic quantum dot
(IOP Publishing LTD, 2009)In this work, we propose an efficient method of reducing the computational effort of variational calculation with a Hylleraas-like trial wavefunction. The method consists of introducing integra transforms for the terms as ... -
I-V characterization of a quantum well infrared photodetector with stepped and graded barriers
(Academic Press LTD- Elsevier Science LTD, 2012)I-V characterization of an n-type quantum well infrared photodetector which consists of stepped and graded barriers has been clone under dark at temperatures between 20-300 K. Different current transport mechanisms and ... -
I-V characterization of a staircase quantum well infrared photodetector
(Wiley-V C H Verlag GMBH, 2011)In this work, a quantum well infrared photodetector structure which consists of three different well thicknesses with three different barrier compositions producing a staircase-like conduction band profile with the reputation ... -
Dark current and optical properties in asymmetric GaAs/AlGaAs staircase-like multiquantum well structure
(Elsevier Science BV, 2013)In this study, we investigate dark current voltage characteristics of GaAs/AlGaAs staircase-like asymmetric multiquantum well structure at various temperatures experimentally. Measured dark current density voltage (J(d)-V) ... -
AlSb and InAs-GaSb layer thickness effect on HH-LH splitting and band gap energies in InAs/AlSb/GaSb type-II superlattices
(Walter De Gruyter GMBH, 2015)This study is based on the investigation of AlSb layer thickness effect on heavy-hole light-hole (HH-LH) splitting and band gap energies in a recently developed N-structure based on InAs/AlSb/GaSb type II superlattice ... -
Broadband staircase quantum well infrared photodetector: working in long wavelength infrared range (LWIR)
(Wiley-V C H Verlag GMBH, 2007)We present a theoretical investigation of a staircase-like quantum well infrared photodetector (QWIP). it detects wavelength between 7.6 mu m and 13.5 mu m range at an applied electric field of F = 1.9x10(4) V/cm at 77 K. ... -
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. ... -
Characterization and ethylene adsorption of natural and modified clinoptilolites
(Elsevier Science BV, 2008)The ethylene adsorption of Turkey clinoptilolite-rich tuff from Gordes and Bigadic region of western of Anatolia and their exchanged forms (K+, Na+ and Ca2+) were investigated. The clinoptilolite samples were characterized ... -
Gibbs Free Energy Assisted Passivation Layers
(Spie-Int Soc Optical Engineering, 2016)Reduction of surface leakage is a major challenge in most photodetectors that requires the elimination of surface oxides on etched mesas during passivation. Engineering the passivation requires close attention to chemical ... -
Electrical and optical performances with extracted minority carrier lifetimes of InAs/GaSb SL photodetector operating in the mid wavelength infrared range
(Academic Press LTD- Elsevier Science LTD, 2017)We report a study on the temperature dependence of electrical and optical performance of InAs/GaSb based type-II superlattice (T2SL) pin photodetectors in the mid wavelength infrared range (MWIR). The SL structure exhibits ... -
Synthesis of novel methacrylate based adsorbents and their sorptive properties towards p-nitrophenol from aqueous solutions
(Academic Press Inc Elsevier Science, 2009)The polymeric adsorbents were synthesized from 2-dimethylaminoethyl methacrylate (DMA) and [2(methacryloyloxy)ethyl]dimethylhexadecylammonium bromide (DMAC(16)) monomers in the presence of ethylene glycol dimethacrylate ... -
Preparation of cationic latexes with different length alkyl groups on their quaternary as supports for IBA catalyst ammonium ions and their use in the hydrolysis of PNPDPP
(Elsevier Science BV, 2008)In this study, four cationic latexes containing n-hexadecyl, n-octyl, or a methyl group as one of the alkyls on their quaternary ammonium ions were synthesized and used as supports for o-iodosobenzoate (IBA) catalyst in ... -
Preparation and characterization of activated carbon produced from pomegranate seeds by ZnCl2 activation
(Elsevier Science BV, 2009)In this study, pomegranate seeds, a by-product of fruit juice industry, were used as precursor for the preparation of activated carbon by chemical activation with ZnCl2. The influence of process variables such as the ... -
Removal of Lead (II) Ions from Aqueous Solutions onto Activated Carbon Derived from Waste Biomass
(Hindawi Publishing Corporation, 2013)The removal of lead (II) ions from aqueous solutions was carried out using an activated carbon prepared from a waste biomass. The effects of various parameters such as pH, contact time, initial concentration of lead (II) ... -
Removal of Orange II from Aqueous Solutions Using N-Vinyl Imidazole-based Hydrogels as Adsorbents
(Taylor & Francis Inc, 2016)Poly(N-vinyl imidazole) hydrogel (p-VIm) and its partially quaternized analogue (p-VIm-Ar) were prepared and used for the removal of Orange II (OII). A fourier transform infrared spectrophotometer, scanning electron ... -
Removal of lead (II) and nickel (II) ions from aqueous solution using activated carbon prepared from rapeseed oil cake by Na2CO3 activation
(Springer, 2015)In this study, rapeseed oil cake as a precursor was used to prepare activated carbons by chemical activation with sodium carbonate (Na2CO3) at 600 and 800 A degrees C. The activated carbon with the highest surface area of ... -
Imprinted polymer/organo-smectite nanocomposites for paraoxon hydrolysis
(Elsevier Science BV, 2010)We have used the imprinting technique to create a polymer/organo-smectite nanocomposite catalyst. The aim was preparing a synthetic enzyme which shows high selectivity for paraoxon hydrolysis. Paraoxon imprinted ... -
Synthesis, Characterization and Adsorptive Properties of Quaternized 2-Dimethylaminoethyl Methacrylate Based Polymer-Clay Nanocomposites
(Taylor & Francis Inc, 2016)[2-(Methacryloyloxy)ethyl]dimethylhexadecylammonium bromide (QDMA) was synthesized by means of quaternization of 2-dimethylaminoethyl methacrylate. Poly(QDMA) and poly(QDMA)-bentonite nanocomposites containing different ...
