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Articles 8341 - 8370 of 10319
Full-Text Articles in Physical Sciences and Mathematics
Molecular Dynamics Study Of Thermal Properties Of Intermetallic Alloys, H. H. Kart, Mehmet Tomak, Tahi̇r Çağin
Molecular Dynamics Study Of Thermal Properties Of Intermetallic Alloys, H. H. Kart, Mehmet Tomak, Tahi̇r Çağin
Turkish Journal of Physics
Molecular dynamics simulations of bulk copper, gold pure metals and their ordered intermetallics alloys of Cu_3Au(L1_2) and CuAu_3(L1_2) have been carried out between above 0 K and below the their melting points of the materials for predicting their temperature-dependent thermophysical properties. The effects of temperature and concentration on the physical properties such as enthalpy, volume, heat capacity, thermal expansion and density of Cu_xAu_{1-x} are studied. Especially, temperature-dependent polynomial functions of enthalpy, volume and density are obtained. Sutton-Chen (SC) and Quantum Sutton-Chen (Q-SC) many-body potentials are used in the constant enthalpy-constant pressure ensemble (HPN) and constant pressure-constant temperature ensemble (TPN). Three …
Molecular Dynamics Studies On Glass Formation Of Pd-Ni Alloys By Rapid Quenching, Sevgi̇ Özdemi̇r Kart, Mehmet Tomak, Mustafa Uludoğan, Tahi̇r Çağin
Molecular Dynamics Studies On Glass Formation Of Pd-Ni Alloys By Rapid Quenching, Sevgi̇ Özdemi̇r Kart, Mehmet Tomak, Mustafa Uludoğan, Tahi̇r Çağin
Turkish Journal of Physics
The rapid solidification of Pd-Ni alloys is studied with the constant-pressure and constant-temperature (TPN) and the constant-volume and constant-temperature (TVN) molecular dynamics technique to obtain an atomic description of glass formation in the alloy. Quantum Sutton-Chen potential for Pd-Ni binary system is applied in the simulations. We present some thermodynamic and structural results from simulations of such glasses over a range of compositions. The structural properties are analyzed by means of pair distribution function, volume, and enthalpy as a function of temperature and concentration at the cooling rates ranging from 5 K/ps to 0.05 K/ps to see whether the Pd-Ni …
Effect Of A Finite Number Of Electrons On The Physical Properties Of Two Dimensional Parabolic Quantum Dot, Berna Gülveren, Ülfet Atav, Mehmet Tomak
Effect Of A Finite Number Of Electrons On The Physical Properties Of Two Dimensional Parabolic Quantum Dot, Berna Gülveren, Ülfet Atav, Mehmet Tomak
Turkish Journal of Physics
The effect of number of particles on the physical properties of a two dimensional parabolic quantum dot system is investigated numerically at finite temperature. The Thomas-Fermi equation is solved self consistently with Poisson equation. The changes induced by electron-electron interaction are also analyzed. It is shown that the numerical procedure that is applied to solve the problem is very efficient at all temperatures.
A Detailed Ensemble Monte Carlo Study Of The Effect Of Quantum Well Width On Quantum Well Infrared Photodetector Characteristics, Sema Memi̇ş, Oray Orkun Cellek, Umut Bostanci, Mehmet Tomak, Cengi̇z Beşi̇kçi̇
A Detailed Ensemble Monte Carlo Study Of The Effect Of Quantum Well Width On Quantum Well Infrared Photodetector Characteristics, Sema Memi̇ş, Oray Orkun Cellek, Umut Bostanci, Mehmet Tomak, Cengi̇z Beşi̇kçi̇
Turkish Journal of Physics
We present a simulation based investigation of the dependence of the device characteristics on the quantum well width in AlGaAs/GaAs quantum well infrared photodetectors (QWIPs) through the ensemble Monte Carlo technique. The simulations on two different standard Al_{0.3}Ga_{0.7}As/GaAs QWIPs with quantum well widths of 36 and 44 Å have shown that the gain in the former is considerably higher, which is due to much longer lifetime of the photoexcited electrons as a result of lower capture probability in the device. We discuss this observation by the investigation of the electron scattering rates in these structures through realistically evaluated scattering mechanisms …
Casimir Energies For Some Single Cavities, Haci Ahmedov, İsmai̇l Hakki Duru
Casimir Energies For Some Single Cavities, Haci Ahmedov, İsmai̇l Hakki Duru
Turkish Journal of Physics
Casimir energies are discussed for some cavities.
The Symmetric Teleparallel Gravity, Muzaffer Adak
The Symmetric Teleparallel Gravity, Muzaffer Adak
Turkish Journal of Physics
We study symmetric teleparallel (STP) gravity model, in which only spacetime non-metricity is nonzero. First we obtain STP equivalent Einstein-Hilbert Lagrangian and give an approach for a generic solution in terms of only metric tensor. Then we obtain a spherically symmetric static solution to the Einstein's equation in STP space-time and discuss the singularities. Finally, we study a model given by a Lagrangian 4-form quadratic in non-metricity. Thus, we seek Schwarzschild-type solutions because of its observational success and obtain some sets of solutions. Finally, we discuss physical relevance of the solutions.
Equivariant Localization For Susy Quantum Mechanics, Levent Akant
Equivariant Localization For Susy Quantum Mechanics, Levent Akant
Turkish Journal of Physics
We apply equivariant localization to supersymmetric quantum mechanics and show that the partition function localizes on the instantons of the theory. Our construction of equivariant cohomology for SUSY quantum mechanics is different than the ones that already exist in the literature. A hidden bosonic symmetry is made explicit and the supersymmetry is extended. New bosonic symmetry is the square of the new fermionic symmetry. The D term is now the parameter of the bosonic symmetry. This construction provides us with an equivariant complex together with a Cartan differential and makes the use of localization principle possible.
Explicit Realization Of Pseudo-Hermitian And Quasi-Hermitian Quantum Mechanics For Two-Level Systems, Ali̇ Mostafazadeh, Seher Özçeli̇k
Explicit Realization Of Pseudo-Hermitian And Quasi-Hermitian Quantum Mechanics For Two-Level Systems, Ali̇ Mostafazadeh, Seher Özçeli̇k
Turkish Journal of Physics
We give an explicit characterization of the most general quasi-Hermitian operator H, the associated metric operators \eta_+, and \eta_+-pseudo-Hermitian operators acting in C^2. The latter represent the physical observables of a model whose Hamiltonian and Hilbert space are respectively H and \C^2 endowed with the inner product defined by \eta_+. Our calculations allows for a direct demonstration of the fact that the choice of an irreducible family of observables fixes the metric operator up to a multiplicative factor.
Infinite-Hamiltonian Structures Of The Riemann Equation, Refi̇k Turhan
Infinite-Hamiltonian Structures Of The Riemann Equation, Refi̇k Turhan
Turkish Journal of Physics
We give two distinct infinite-Hamiltonian representations for the Riemann equation. One with first order Hamiltonian operators and another with third order-first order Hamiltonian operators. Both representations contain an arbitrary function of the dynamical variable. We prove that all the Hamiltonian operators of the Riemann equation are mutually compatible.
Ibm-2 Calculations Of Selected Even-Even Ruthenium Nuclei, İlyas İnci̇, Nuretti̇n Türkan
Ibm-2 Calculations Of Selected Even-Even Ruthenium Nuclei, İlyas İnci̇, Nuretti̇n Türkan
Turkish Journal of Physics
In this study, we have employed the Interacting Boson Model-2 (IBM-2) to determine the most appropriate Hamiltonian for the study of ruthenium nuclei in the region A \cong 100. Using the best fit values of parameters to construct the Hamiltonian, we have estimated energy levels and multipole mixing ratios (\delta (E2/M1)) for some doubly-even Ru nuclei. The results are compared with previous experimental and theoretical data and it is observed that they are in good agreement.
Ibm-2 Calculations Of Selected Even-Even Palladium Nuclei, İlyas İnci̇, Nuretti̇n Türkan
Ibm-2 Calculations Of Selected Even-Even Palladium Nuclei, İlyas İnci̇, Nuretti̇n Türkan
Turkish Journal of Physics
In this study, we have employed the Interacting Boson Model-2 (IBM-2) to determine the most appropriate Hamiltonian for the study of palladium nuclei. Using the best fit values of parameters to construct the Hamiltonian, we have estimated energy levels and multipole mixing ratios (\delta (E2/M1)) for some doubly-even Pd nuclei. The results are compared with previous experimental and theoretical data and it is observed that they are in good agreement.
Band Gap Of Cubic Aln, Gan And Inn Compounds Under Pressure, S. Berrah, Hamza Abid, A. Boukortt, Mohamed Sehil
Band Gap Of Cubic Aln, Gan And Inn Compounds Under Pressure, S. Berrah, Hamza Abid, A. Boukortt, Mohamed Sehil
Turkish Journal of Physics
Numerical simulation based on FP-LAPW calculations is applied to study the lattice parameters, bulk modulus and band gap energy of zinc blende binaries AlN, GaN and InN under hydrostatic pressure. The results obtained are in a good agreement with experimental and theoretical values.
Influence Of Thickness On Optical Properties Of A: As_2se_3 Thin Films, Dinesh C. Sati, Rajendra Kumar, Ram Mohan Mehra
Influence Of Thickness On Optical Properties Of A: As_2se_3 Thin Films, Dinesh C. Sati, Rajendra Kumar, Ram Mohan Mehra
Turkish Journal of Physics
This paper reports optical properties of amorphous chalcogenide thin films of As_2Se_3 of different thicknesses 2000-6800 Å. The transmittance and reflectance of thin films were measured in the wavelength range 500-1000 nm. It was found that the optical band gap increases with film thickness. Variation of refractive index n and extinction coefficient k with thickness have been studied to analyze optical efficiency of the As_2Se_3 thin films. The dielectric behavior of the films has also been studied and high frequency dielectric constants \varepsilon_{\infty} has been estimated as a function of thickness of films.
Synthesis And Anticancer Evaluation Of Some New Unsymmetrical 3,5-Diaryl-4h-1,2,4-Triazole Derivatives, Olcay Beki̇rcan, Bahi̇tti̇n Kahveci̇, Murat Küçük
Synthesis And Anticancer Evaluation Of Some New Unsymmetrical 3,5-Diaryl-4h-1,2,4-Triazole Derivatives, Olcay Beki̇rcan, Bahi̇tti̇n Kahveci̇, Murat Küçük
Turkish Journal of Chemistry
A series of 4-arylidenamino-4H-1,2,4-triazole derivatives (3-11) were synthesized from the treatment of 4-amino-4H-1,2,4-triazoles (2) with certain aldehydes. Compounds 3-11 were reduced with NaBH_4 to afford the corresponding 4-arylmethylenamino-4H-1,2,4-triazoles (12-20). Compounds 1-10 and 12-19 were characterized by elemental analyses and ^1H NMR, ^{13}C NMR, IR and UV spectral data. Compounds 11 and 20 were characterized by ^1H NMR, ^{13}C NMR, IR and mass spectral data. Compounds 14, 16, 17, and 18 were tested for anticancer activities. Compound 17, chosen for its higher anticancer activity in the preliminary tests with the cancer cell lines of MCF7, NCI-H460, and SF-268, exhibited remarkable anticancer …
The Synthesis Of 4-Phenoxyphenylglyoxime And 4,4'-Oxybis(Phenylglyoxime) And Their Complexes With Cu(Ii), Ni(Ii) And Co(Ii), Ahmet Coşkun
The Synthesis Of 4-Phenoxyphenylglyoxime And 4,4'-Oxybis(Phenylglyoxime) And Their Complexes With Cu(Ii), Ni(Ii) And Co(Ii), Ahmet Coşkun
Turkish Journal of Chemistry
4-Acetyldiphenyl ether and 4,4'-diacetyldiphenyl ether were synthesized from diphenyl ether and acetyl chloride in the presence of AlCl_3 used as catalyst. Subsequently, their keto oxime and glyoxime derivatives were prepared. The metal complexes of the glyoximes such as Cu(II), Ni(II) and Co(II) were also prepared. The structures of these ligands and their complexes were identified by FT-IR, ^1H NMR and ^{13}C NMR spectral data, elemental analysis and magnetic measurements.
Speaking With Numbers: Scientific Literacy And Public Understanding Of Science, Levent Sevgi̇
Speaking With Numbers: Scientific Literacy And Public Understanding Of Science, Levent Sevgi̇
Turkish Journal of Electrical Engineering and Computer Sciences
Public understanding of science and scientific literacy is discussed. Scientific method, scientific process and scientific filter are reviewed accordingly. Basic terms of measurement and numerical calculation are outlined. Finally, fundamental requirements of scientific literacy and critical response skills are presented.
A Connected Sum Of Knots And Fintushel-Stern Knot Surgery On 4-Manifolds, Manabu Akaho
A Connected Sum Of Knots And Fintushel-Stern Knot Surgery On 4-Manifolds, Manabu Akaho
Turkish Journal of Mathematics
We give some new examples of smooth 4-manifolds which are diffeomorphic although they are obtained by Fintushel-Stern knot surgeries on a smooth 4-manifold with different knots; the first such examples are given by Akbulut [1]. In the proof we essentially use the monodromy of a cusp.
A Fractal Example Of A Continuous Monotone Function With Vanishing Derivatives On A Dense Set And Infinite Derivatives On Another Dense Set, Bünyami̇n Demi̇r, Vakif Dzhafarov, Şahi̇n Koçak, Mehmet Üreyen
A Fractal Example Of A Continuous Monotone Function With Vanishing Derivatives On A Dense Set And Infinite Derivatives On Another Dense Set, Bünyami̇n Demi̇r, Vakif Dzhafarov, Şahi̇n Koçak, Mehmet Üreyen
Turkish Journal of Mathematics
Inspired by the theory of analysis on fractals, we construct an example of a continuous, monotone function on an interval, which has vanishing derivatives on a dense set and infinite derivatives on another dense set. Although such examples could be constructed by classical means of probability and measure theory, this one is more elementary and emerges naturally as a byproduct of some new fractal constructions.
A Survey On The Distribution Of B-Free Numbers, Emre Alkan, Alexandru Zaharescu
A Survey On The Distribution Of B-Free Numbers, Emre Alkan, Alexandru Zaharescu
Turkish Journal of Mathematics
In this paper we present a survey of recent progress on the distribution of B-free numbers in short intervals and some of its applications.
The Restriction And The Continuity Properties Of Potentials Depending On \Lambda-Distance, M. Zeki̇ Sarikaya, Hüseyi̇n Yildirim
The Restriction And The Continuity Properties Of Potentials Depending On \Lambda-Distance, M. Zeki̇ Sarikaya, Hüseyi̇n Yildirim
Turkish Journal of Mathematics
In this study we establish theorems on the restriction and continuity of the generalized Riesz potentials with the non-isotropic kernels depending on \lambda-distance.
The Radius Of Starlikeness P-Valently Analytic Functions In The Unit Disc, Yaşar Polatoğlu, Meti̇n Bolcal, Arzu Şen, H. Esra Özkan
The Radius Of Starlikeness P-Valently Analytic Functions In The Unit Disc, Yaşar Polatoğlu, Meti̇n Bolcal, Arzu Şen, H. Esra Özkan
Turkish Journal of Mathematics
In the present paper we shall give the radius of starlikeness for the classes of p-valent analytic functions in the unit disc D = { z z < 1 }.
Electrical And Computer Engineering Education In The 21^{St} Century: Issues, Perspectives And Challenges, Levent Sevgi̇
Electrical And Computer Engineering Education In The 21^{St} Century: Issues, Perspectives And Challenges, Levent Sevgi̇
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
Engineering Education In The 21st Century: Issues And Perspectives, Leopold B. Felsen
Engineering Education In The 21st Century: Issues And Perspectives, Leopold B. Felsen
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
Infusing Technical Communication And Teamwork Within The Ece Curriculum, By April Kedrowicz, Sundy Watanabe, Damon Hall, Cynthia Furse
Infusing Technical Communication And Teamwork Within The Ece Curriculum, By April Kedrowicz, Sundy Watanabe, Damon Hall, Cynthia Furse
Turkish Journal of Electrical Engineering and Computer Sciences
This paper highlights a unique approach to infusing formal training and practice in oral and written communication and teamwork development in the Department of Electrical and Computer Engineering (ECE) at the University of Utah. Faculty and graduate (Ph.D.) students from the College of Humanities have teamed up with faculty from engineering to develop communication and teamwork instruction that is integrated into the existing engineering curriculum. These skills are used as a vehicle to provide better understanding of engineering concepts and their applications.
Computational Sciences: At The Intersection Of Science And Engineering--Case Study For Academic And Research Programs, Menas Kafatos, Peter Becker, Zafer Boybeyi̇
Computational Sciences: At The Intersection Of Science And Engineering--Case Study For Academic And Research Programs, Menas Kafatos, Peter Becker, Zafer Boybeyi̇
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
An International Dialogue On Electrical Engineering Education, Thales Papazoglou
An International Dialogue On Electrical Engineering Education, Thales Papazoglou
Turkish Journal of Electrical Engineering and Computer Sciences
. PAPAZOGLOU Chairman -- ELCOMPEET'04 Technological Educational Institute of Crete, GREECE e-mail: tmpapa@teiher.gr
Online Learning Resource For Smooth Transition From High School To Engineering Education, Riadh W. Y. Habash, Christine Suurtaam, Mustapha C. E. Yagoub, Karima Kara, Ghanim Ibrahim
Online Learning Resource For Smooth Transition From High School To Engineering Education, Riadh W. Y. Habash, Christine Suurtaam, Mustapha C. E. Yagoub, Karima Kara, Ghanim Ibrahim
Turkish Journal of Electrical Engineering and Computer Sciences
Although high school mathematics curriculum documents in Ontario, Canada have, for the past two decades, made calls for classroom practices involving both modeling and applications, students still experience difficulties in moving into a university engineering program. This paper discusses a new initiative in online learning and the teaching of mathematical modeling and applications in engineering education at the University of Ottawa, Canada. In particular, we explore how modeling and Internet technologies can enhance progress in engineering education.
Modeling And Simulation Concepts In Engineering Education: Virtual Tools, Levent Sevgi̇
Modeling And Simulation Concepts In Engineering Education: Virtual Tools, Levent Sevgi̇
Turkish Journal of Electrical Engineering and Computer Sciences
This article reviews fundamental concepts of modeling and simulation in computational sciences, such as a model, analytical- and numerical-based modeling, simulation, validation, verification, etc., in relation to the virtual labs widely-offered as parts of engineering education. Virtual tools that can be used in electromagnetic engineering are also introduced.
Two, Three And Four-Dimensional Electromagnetics Using Differential Forms, Karl F. Warnick, Peter Russer
Two, Three And Four-Dimensional Electromagnetics Using Differential Forms, Karl F. Warnick, Peter Russer
Turkish Journal of Electrical Engineering and Computer Sciences
The exterior calculus of differential forms provides a mathematical framework for electromagnetic field theory that combines much of the generality of tensor analysis with the computational simplicity and concreteness of the vector calculus. We review the pedagogical aspects of the calculus of differential forms in providing distinct representations of field intensity and flux density, physically meaningful graphical representations for sources, fields, and fluxes, and a picture of the curl operation that is as simple and intuitive as that of the gradient and divergence. To further highlight the benefits of differential forms notation, we demonstrate the flexibility of the calculus of …
Complex Analysis Of The Lossy-Transmission Line Theory: A Generalized Smith Chart, E. Gago-Ribas, C. Dehesa-Martinez, M. J. Gonzalez-Morales
Complex Analysis Of The Lossy-Transmission Line Theory: A Generalized Smith Chart, E. Gago-Ribas, C. Dehesa-Martinez, M. J. Gonzalez-Morales
Turkish Journal of Electrical Engineering and Computer Sciences
It has been very usual in the specialized literature to skip the detailed study of the lossy transmission line theory by reducing it to the low-loss approximation. Although this is valid in the most common practical cases, the study of the general lossy case becomes very important due to the fact that it makes possible a better and deeper understanding of the physical effects associated to general losses, as well as the low-loss frequency-dependent regime. Besides, the analysis of the general case provides important results that may be extended to the analysis of real waveguiding systems, facilitating the understanding and …