Browsing Fizik Bölümü by Issue Date
Now showing items 1-20 of 640
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Monte-Carlo calculations of low energy positrons in copper
(Pergamon-Elsevier Science Ltd, 1996)An analogue Monte-Carlo code has been used to simulate the transport of positrons in copper with an incoming energy range of 60 eV-30 keV. The simulation technique is based mainly on the screened Rutherford differential ... -
A tunable hot-electron light emitter
(IOP Publishing LTD, 1997)We demonstrate the operation of a novel tunable wavelength surface emitting device. The device is based on a p-GaAs and n-Ga1-xAlxAs heterojunction containing an inversion layer on the p-side, and GaAs quantum wells on the ... -
Monte Carlo calculations of medium energy positrons in metals
(Pergamon-Elsevier Science Ltd, 1997)The Monte Carlo code, which has been used previously to simulate the transport of positrons in aluminium and copper, was modified for simulating the positron transport in silver, tin, gold and lead with incident positron ... -
Pyroelectric superlattices based on copolysiloxane/calix[8]arene alternate layer LB films
(Elsevier Science Bv, 1999)The pyroelectric effect in alternate layer LB superlattices incorporating interacting lamellae of carboxyl and amino moieties has been investigated. Three distinct systems have been studied, namely (a) a copolysiloxane ... -
Optimisation of the tunable wavelength hot electron light emitter
(1999)We report on the optimization of the hot electron tunable wavelength surface light emitting device developed by us. The device consists of a p-GaAs, and n-Ga1-cursive Greek chi Alcursive Greek chi As heterojunction containing ... -
The power absorption and the penetration depth of electromagnetic radiation in lead telluride under cyclotron resonance conditions
(Elsevier Science Bv, 1999)Cyclotron resonance absorption in n- and p-type PbTe was observed by Nii and was analysed under classical skin effect conditions. When the values of DC magnetic field corresponding to peaks are plotted against the held ... -
Tunable wavelength light emission from longitudinally biased p-GaAs/n-Ga1-xAlxAs junction containing GaAs quantum wells: Non-linear dynamics
(Elsevier Science Bv, 1999)We report on the operation and non-linear dynamics of a hot electron device that emits light with wavelength tunability, The device consists of p-GaAs/n-Ga-1 -xAlxAs heterojunction containing an inversion layer on the ... -
Optimization of the tunable wavelength hot electron light emitter
(1999)We report on the optimization of the hot electron tunable wavelength surface light emitting device developed by us. The device consists of a p-GaAs, and nGa1-xAlxAs heterojunction containing an inversion layer on the p- ... -
3,9-dimethyl-1,11-diphenyl-4,8-diaza-undecane-1,11-dione dihydrate
(Munksgaard Int Publ Ltd, 1999)The title compound, C23H26N2O2. 2H(2)O, displays strong intramolecular N-H ... O [2.637(2) Angstrom] and intermolecular O-H ... O [2.763(4) and 2.842(3) Angstrom] hydrogen bonds within each salicylideneimine unit and water ... -
Monte-Carlo calculations of positron implantation profiles in silver and gold
(Pergamon-Elsevier Science Ltd, 2000)To investigate the implantation profiles of positrons in silver and gold, the Monte-Carlo programs developed previously by Ozmutlu and Aydin (1997) to simulate the transport of positrons in metals was used. The simulation ... -
Total cross sections for elastic scattering of positrons for silicon, gallium and antimony atoms
(2000)In this paper, elastic total cross sections of positrons which is scattered by bound silicon, gallium and antimony atoms have been calculated. The calculation of elastic scattering cross section for E<10 keV made with ... -
Synthesis, crystal structure and magnetic properties of a novel Gd-III-Cu-II heterodinuclear complex
(Verlag Z Naturforsch, 2000)Preparation, crystal structure and magnetic properties of a heterodinuclear complex, LCu(Me2CO) Gd (NO3)(3) (L = (N,N'-bis(3-methoxysalicylidene)propane-1,2-diamine) are reported. The crystal structure of the complex was ... -
Dönen kryostat (RC) ile manyetik malzeme üretimi
(2001)Döner Kryostat (RC) Sistem, ferromanyetik ince filmler ve çok tabakalı yapıları üretmek üzere geliştirildi. Önceleri metalik olmayan tabakalı ince filmler üretmek için ilk defa kullanılan sistem, buharlaştırma ve doğru ... -
Longitudinally biased GaAs/AlxGa1−xAs hot electron VCSEL design
(2001)Bu çalışmada, aktif bölgesinde HELLISH-2 (Hot Electron Light Emission and Lasing In Semiconductor Heterostructure-Type 2) yapısını içeren yeni bir dikey-kavite yüzey yayınımlı lazer (VCSEL) tasarımı sunulmaktadır. Bu yapı ... -
Non-destructive crack detection by capturing local flux leakage field
(Elsevier Science Sa, 2001)The crack detection in the industrial machine parts is very important. The non-destructive crack detection and evaluation of the these cracks are highly desirable from the viewpoint of safe and economic operation of installed ... -
Antiferromagnetic coupling in a (mu-hydroxo)(mu-pyrazolato)dicopper(II) complex. Synthesis, crystal structure, magnetic properties, and theoretical studies
(Verlag Z Naturforsch, 2001)Preparation, crystal structure and magnetic properties of a 3,5-dimethylpyrazolate bridged binuclear copper(II) complex [Cu-2(L-1)(3,5 prz)] (L-1 = 1,3-Bis(2-hydroxy-1-napthylideneamino)propan-2-ol) (1) are reported. ... -
2-[1-(Hydroxyimino)ethyl]-2,5,5-tri- methylperhydropyrimidine-butane-2,3-dione monooxime (1/1)
(Munksgaard Int Publ Ltd, 2001)The title compound, C9H19N3O C4H7NO2, displays strong intramolecular O?H N [O N 2.6743 (13) AÊ ] and N? H N [N N 2.6791 (15) AÊ ] hydrogen bonds, and strong intermolecular O?H N [O N 2.7949 (15) AÊ ] and N? H ... -
In-plane anisotropy and stress detection of films deposited by RC technique
(Springer-Verlag, 2001)A Novel Rotating Cryostat (RC) vacuum system originally designed to fabricate organic layers has,been developed in order to prepare magnetic materials for specific applications such as sensors. The RC sputtering system has ... -
A dinuclear pyrazolato-N : N '-bridged dinickel(II) complex of 1,3-bis(5-chlorosalicylideneamino)propan-2-ol
(Munksgaard Int Publ Ltd, 2001)The title compound, mu-[1,3-bis(5-chloro-2-oxidobenzylideneamino)propan-2-olato(3-)]-O,N,O':O',N',O"-mu-(3,5-dimethylpyrazolato)-N:N' -dinickel(II), [Ni-2(C17H13Cl2N2O3)(C5H7N2)], has crystallographic mirror symmetry. The ... -
Dinuclear pyrazolato-N:N′-bridged dinickel(II) complex of 1,3-bis(5-chlorosalicylideneamino)propan-2-ol
(Munksgaard Int Publ. Ltd.,Copenhagen K, Denmark, 2001)The title compound, µ-[1,3-bis(5-chloro-2- oxidobenzylideneamino)propan-2-olato(3-)]-O,N,O':O', N',O¨-µ-(3,5-dimethyl-pyrazolato)-N:N'-dinickel(II), [Ni2(C17H13Cl2N2O3) (C5H7-N2)], has crystallographic mirror symmetry. The ...
