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Articles 1 - 30 of 73
Full-Text Articles in Physical Sciences and Mathematics
Field Electron Emission Area Revisited: An Integrated Method For The Area Extraction Model, Ahmed Abdulrahman Al-Tabbakh
Field Electron Emission Area Revisited: An Integrated Method For The Area Extraction Model, Ahmed Abdulrahman Al-Tabbakh
Turkish Journal of Physics
For electron field emitters, the emitter's physical and geometrical parameters, namely the emitter work function and its geometrical factor, are extracted from the slope of the Fowler-Nordheim (FN) plot. The literature contains few investigations and reviews of extended parameter extraction models based on the slope and intercept of the FN plot. However, due to the complexity of these reviews, there is a great need for an integrated approach to the area extraction model whereby a simplified account of the derivation and implementation of the model is presented and made convenient, especially for scholars other than physicists and engineers. This is …
Investigation Of The Influence Of Various Reflector Elements Material Types On The Core Nuclear Parameters Of The 2 Mw Triga Mark-Ii Research Reactor Using The Monte Carlo Code, Abdelaziz Darif, Abdelouahed Chetaine, Mohammed Mghar, Ouadie Kabach
Investigation Of The Influence Of Various Reflector Elements Material Types On The Core Nuclear Parameters Of The 2 Mw Triga Mark-Ii Research Reactor Using The Monte Carlo Code, Abdelaziz Darif, Abdelouahed Chetaine, Mohammed Mghar, Ouadie Kabach
Turkish Journal of Physics
The influence of variation in the kind of material of neutron reflector elements on the core neutronic parameters of the Moroccan Triga Mark-II research reactor was examined. The comparison was made between three kinds of reflector element materials: graphite, beryllium, and beryllium oxide. MCNP5 Monte Carlo computations of the effective neutron multiplication factor (${k}_{{eff}})$ of the reactor according to the number of reflector material elements inserted in the reactor core for these three reflector elements materials families were carried out. The results found could be used in order to increase the ${k}_{{eff}}$ parameter without changing the size of the reactor.
Predictions On Three-Particle Azimuthal Correlations In Proton-Proton Collisions, Şener Özönder
Predictions On Three-Particle Azimuthal Correlations In Proton-Proton Collisions, Şener Özönder
Turkish Journal of Physics
The ridge signal, which is long-ranged in rapidity, in di-hadron correlations in high-multiplicity p-p and p-A collisions opened up a whole new research area in high-energy QCD. Although the ridge had been observed in A-A collisions and interpreted as a result of the radial flow of quark-gluon plasma, it had not appeared until recently in the data of small collision systems such as p-p and p-A, nor had it been predicted theoretically or seen in event generators. There are two competing approaches that attempt to explain the systematics of the di-hadron ridge signal: hydrodynamics and gluon saturation physics (color glass …
Cycloid Experiment For Freshmen Physics Labs, Resat Akoglu, Seyedhabibollah Mazharimousavi, Mustafa Halilsoy
Cycloid Experiment For Freshmen Physics Labs, Resat Akoglu, Seyedhabibollah Mazharimousavi, Mustafa Halilsoy
Turkish Journal of Physics
We establish an instructive experiment to investigate the minimum time curve traveled by a small billiard ball rolling in a grooved track under gravity. Our intention is to popularize the concept of minimum time curves anew for pedagogical reasons and to propose it as a feasible physics experiment both for freshmen and sophomore classes. The experiment is simplified enough to provide motivation for the students. We observed that even the students who were not physics majors enjoyed such a cycloid experiment.
Characterizing Decaying Dark Matter: X-Ray Emission From Sterile Neutrinos, Murat Hüdaverdi̇
Characterizing Decaying Dark Matter: X-Ray Emission From Sterile Neutrinos, Murat Hüdaverdi̇
Turkish Journal of Physics
Recently, an unknown emission line at E $\sim$3.5 keV from several astrophysical objects has been detected. The line is suggested to be originating from decaying dark matter particles. The results have drawn great attention from the astrophysics and particle physics community. Since the detected line is significantly weak there has also been a long debate over the origin of this mysterious signal. The most accepted scenario is a radiatively decaying sterile neutrino of 7.1 keV in mass producing a monochromatic 3.5 keV line, which is observable in X-ray energy ranges. The problem has not been settled and further observations from …
Design Of A Multifunctional Sample Probe For Transport Measurements, Mustafa Öztürk, Numan Akdoğan
Design Of A Multifunctional Sample Probe For Transport Measurements, Mustafa Öztürk, Numan Akdoğan
Turkish Journal of Physics
Herein, we describe a multifunctional sample probe equipped with a two-axis goniometer for transport measurements. The two-axis goniometer enables both computer-controlled 360$^{\circ}$ out-of-plane and manual 360$^{\circ}$ in-plane rotations. The multifunctional sample probe was successfully implemented to a host dewar and an electromagnet system. The developed probe is capable of performing transport measurements while fully controlling the parameters such as the magnetic and electrical fields, the angle, the temperature, and the current/voltage parameters in a wide range. The design of the multifunctional sample probe allows easy installation into different dewar and magnet systems and connection of a wide range of external …
Dimension Of Quantum Mechanical Path, Chain Rule, And Extension Of Landau's Energy Straggling Method Using $F^\Alpha$-Calculus, Saleh Ashrafi, Ali Khalili Golmankhaneh
Dimension Of Quantum Mechanical Path, Chain Rule, And Extension Of Landau's Energy Straggling Method Using $F^\Alpha$-Calculus, Saleh Ashrafi, Ali Khalili Golmankhaneh
Turkish Journal of Physics
$F^\alpha$-calculus was recently presented for fractals. We show that the $F^\alpha$-derivative satisfies the chain rule and affirms that the dimension of a quantum mechanical path is two. $F^\alpha$-calculus allows us to extend quantum mechanics to fractal curves. To show the applicability of $F^\alpha$-calculus, we study the fractal model of a particle in a box. $F^\alpha$-calculus is suitable for describing the motion of particles with a fractal route through matter. In addition, we extend Landau's energy straggling method of charged particles to fractals.
Super Inflation Mechanism And Dark Energy From A Cosmological Entropy Perspective, Ali̇ İhsan Keski̇n
Super Inflation Mechanism And Dark Energy From A Cosmological Entropy Perspective, Ali̇ İhsan Keski̇n
Turkish Journal of Physics
Various approaches are developed that provide a unification of the early inflationary epoch of the universe and dark energy (cosmic accelerating expansion case). In one respect, we express this unification in a universal thermodynamic framework within the context of $F\left( T,T_{G} \right)$ gravity, where $T$ represents the torsion invariant and $T_{G}$ is the teleparallel equivalent of the Gauss--Bonnet term. For a Friedmann-Robertson-Walker universe model bounded by the dynamical apparent horizon, we explore the generalized second law of gravitational thermodynamics (GSLT). Finally, we discuss the super inflation mechanism, the deceleration case (radiation and dust regions), and the late time cosmic acceleration …
Permanent Magnet Motion In A Copper Tube, Jaroslav Franek, Martin Soka
Permanent Magnet Motion In A Copper Tube, Jaroslav Franek, Martin Soka
Turkish Journal of Physics
This paper deals with the investigation of braking forces induced by eddy currents, which have effects on the permanent magnet moving at a constant speed in the direction of the conductive tube axis. The analysis is based on calculation of an action of a force between the current density, representing the magnet, and the eddy currents. The chosen solution is based on classical electrodynamics and can serve as a guide for the calculation of other cases, where braking forces are created between the moving cell, which is a source of the magnetic field, and a close conductive subject. The obtained …
The Influence Of Deposit Composition Controlled By Changing The Relative Fe Ion Concentration On Properties Of Electroplated Nanocrystalline Co-Fe-Cu Ternary Thin Films, Umut Saraç, Mali̇k Kaya, Mevlana Celaletti̇n Baykul
The Influence Of Deposit Composition Controlled By Changing The Relative Fe Ion Concentration On Properties Of Electroplated Nanocrystalline Co-Fe-Cu Ternary Thin Films, Umut Saraç, Mali̇k Kaya, Mevlana Celaletti̇n Baykul
Turkish Journal of Physics
Ternary Co-Fe-Cu thin films with 78.5-92.4 at.% Co, 4.1-17.9 at.% Fe, and 3.1-3.6 at.% Cu were electroplated at ambient temperature from electrolytes with different relative Fe ion concentrations with respect to the Co ion concentration on the glass substrates coated with indium tin oxide (ITO). It was revealed that the Fe is more easily deposited than Co for all electrolyte conditions. The phase structure of the films changed from a mixture of hcp Co and fcc/hcp Co to a mixture of fcc/hcp Co and bcc Fe and the mean crystallite size diminished with increasing Fe content within the deposits. A …
Control Of Laser-Induced Nonadiabatic Molecular Alignment In Dissipative Media, Gamze Kaya
Control Of Laser-Induced Nonadiabatic Molecular Alignment In Dissipative Media, Gamze Kaya
Turkish Journal of Physics
Laser-induced nonadiabatic alignment in nitrogen and mixtures of nitrogen with Ar gas was investigated using the ultrafast optical Kerr effect in the collinear pump-probe setup. We find that dissipative media produce desired alignment characteristics in distinct manners to decoherence and to population relaxation. The results show that the intense laser alignment can be used as a control tool of molecular dynamics in dissipative environments.
Theory And Application Of Hydrogen Formation In Proton-Alkali Atom Collision, Sabbah Abdelwahab Elkilany
Theory And Application Of Hydrogen Formation In Proton-Alkali Atom Collision, Sabbah Abdelwahab Elkilany
Turkish Journal of Physics
The possibility of producing more hydrogen during p-alkali atom collisions is discussed. The coupled static approximation is modified for the first time to make it applicable to the multichannel problem of the collisions of p-alkali atoms. The formation of H (1s) and excited H (in 2s- and 2p- states) in the scattering of p-Li atoms is treated to test the convergence of our method. The modified method is used to calculate the total cross-sections of seven partial waves in a range of energy between 50 and 1000 keV. Our p-Li results are compared with earlier ones.
Photon In A Cylindrical Resonant Cavity, Cavi̇t Teki̇nçay, Yusuf Sucu
Photon In A Cylindrical Resonant Cavity, Cavi̇t Teki̇nçay, Yusuf Sucu
Turkish Journal of Physics
In this study, the massless and massive spin-1 particle equations, derived from the excited states of the zitterbewegung model, are considered for the photon in the cylindrical resonant cavity background. The resonant frequencies of the particles are also obtained. We show that these frequencies become equivalent in the $M^{2}\to 0$ limit.
Symmetry Reduction Of The First Heavenly Equation And $2+1$-Dimensional Bi-Hamiltonian System, Devri̇m Yazici
Symmetry Reduction Of The First Heavenly Equation And $2+1$-Dimensional Bi-Hamiltonian System, Devri̇m Yazici
Turkish Journal of Physics
The first heavenly equation of Plebanski in the two-component form is known to be a $3+1$-dimensional tri-Hamiltonian system. We show that a particular choice of symmetry reduction applied to the first heavenly equation yields a $2+1$-dimensional bi-Hamiltonian system. For this tri-dimensional system, we present Lagrangian, Hamiltonian, and recursion operators; point symmetries; and integrals of motions.
Quantum Many-Body Interactions In The Presence Of Disordered Potentials, Riza Oğul
Quantum Many-Body Interactions In The Presence Of Disordered Potentials, Riza Oğul
Turkish Journal of Physics
The time evolution of the quantum nonequilibrium states of many-body particles is described with a set of hierarchies of quantum kinetic equations with quantum wave functions. A collision term is obtained in terms of two-body interactions in the mean-field with a disordered potential, which is proposed for the first time. The implications and the limits of applicability of the resulting kinetic equations are discussed.
Thermodynamics Of Cosmological Models With Generalized $G$ And $\Lambda $, M Saratchandra Singh, Sanasam Surendra Singh
Thermodynamics Of Cosmological Models With Generalized $G$ And $\Lambda $, M Saratchandra Singh, Sanasam Surendra Singh
Turkish Journal of Physics
Here we investigate spatially flat Friedmann-Robertson-Walker space-time models of the universe to study the thermodynamic behaviors in light of variables $G$ and $\Lambda $. A particular method to find the solutions of Einstein's field equations and mathematical expressions for temperature and entropy of the perfect fluid cosmological models is introduced by using both the equation of state and the assumption $G=G_{0} \,a^{n}$. It is observed that the phantom field of ($\omega
Spectral Properties Of The Galactic Supernova Remnant Vela Jr. (G266.2-1.2) Using Chandra, Nergi̇s Cesur, Aytap Sezer, Murat Hüdaverdi̇
Spectral Properties Of The Galactic Supernova Remnant Vela Jr. (G266.2-1.2) Using Chandra, Nergi̇s Cesur, Aytap Sezer, Murat Hüdaverdi̇
Turkish Journal of Physics
An X-ray nonthermal spectral investigation of the galactic shell-type supernova remnant (SNR) Vela Jr. using archival data from Chandra for the northern and northwestern rims of the SNR is presented. Spectra were extracted from four emission regions in these rims (three in the northwestern rim and one in the northern). The X-ray spectra of the northwestern rim were well reproduced by a single power-law and the synchrotron model srcut, and for the north rim, the spectra were fitted by a single and a broken power-law, respectively. The spectra of both rims show no line emission. Each spectrum was fit by …
Monte Carlo Simulation Of Dynamic Phase Transition Properties Of Core-Shell Magnetic Nanoparticles With Similar Volumes, Erol Vatansever
Monte Carlo Simulation Of Dynamic Phase Transition Properties Of Core-Shell Magnetic Nanoparticles With Similar Volumes, Erol Vatansever
Turkish Journal of Physics
We implement Monte Carlo simulations to determine dynamic phase transition features of both cubical and spherical nanoparticles composed of spin-1/2 cores surrounded by a spin-1 shell layer. The particles are subjected to an oscillating magnetic field. We plan these particles such that they have similar volumes. It is observed that the nonequilibrium magnetic phase transition temperatures of the particles with similar volumes explicitly depend on their geometrical shapes as well as the system parameters. The cubic one has a higher transition temperature than the spherical one for the small interface coupling, whereas the transition temperature of the spherical particle becomes …
Density Functional Theory Of Cubic Zirconia And 6-15 Mol% Doped Yttria-Stabilized Zirconia: Structural And Mechanical Properties, Berna Akgenç, Tahi̇r Çağin
Density Functional Theory Of Cubic Zirconia And 6-15 Mol% Doped Yttria-Stabilized Zirconia: Structural And Mechanical Properties, Berna Akgenç, Tahi̇r Çağin
Turkish Journal of Physics
Results of ab-initio density-functional theory calculations within the generalized gradient approximation (GGA-PBE) of structural and mechanical properties of cubic zirconia and yttria-stabilized zirconia (YSZ) with yttria (Y$_{2}$O$_{3})$ concentrations of 6.67, 10.34, and 14.28 mol% are reported. It is found that the calculated structural and mechanical parameters of all considered structures are highly consistent with the existing experimental data and the other theoretical values. The doping concentration of yttria-stabilized zirconia has critical importance in ionic conductivity and stabilization of high temperature down to room temperature. The lattice parameter and cell volume linearly decrease with increases in doping concentration. Moreover, the effects …
Stephen Hawking - A Great Mind (8 January 1942 -- 14 March 2018), Mukhtar Ahmed Rana
Stephen Hawking - A Great Mind (8 January 1942 -- 14 March 2018), Mukhtar Ahmed Rana
Turkish Journal of Physics
Hawking induced a knowledge revolution in theoretical physics. His bedrock concepts and explanations reshaped modern physics.
A Minimal Fermion-Scalar Preonic Model, Ümi̇t Kaya, Bi̇lgehan Bariş Öner, Saleh Sultanov
A Minimal Fermion-Scalar Preonic Model, Ümi̇t Kaya, Bi̇lgehan Bariş Öner, Saleh Sultanov
Turkish Journal of Physics
A minimal fermion-scalar preonic model containing two fermionic preons and one scalar preon is proposed. This scheme allows prevention of the occurrence of undesired SM-level particles, namely leptons and quarks with unusual electric charges. Similar to the previous FS models, color-octet leptons and color-sextet quarks, which are expected to have masses much lower than the compositeness scale, are predicted. Observation of these particles could provide first indications of preonic models. The FCC/SppC pp option will give an opportunity to probe $m_{q_{6}}$ up to 48/75 TeV and $m_{l_{8}}$ up to 15/27 TeV within 1 year of operation at nominal luminosity. FCC/SppC …
Galactic H$\Alpha $ Emission Line Studies Using Defpos At The Tübi̇tak National Observatory, Muhi̇tti̇n Şahan
Galactic H$\Alpha $ Emission Line Studies Using Defpos At The Tübi̇tak National Observatory, Muhi̇tti̇n Şahan
Turkish Journal of Physics
H$\alpha $ spectral line (6563 Å) profiles of eight northern H II regions in our galaxy (Sh2-25, Sh2-131, Sh2-237, IC 434, IC 1318, NGC 1982, NGC 6543, and NGC 6611) have been obtained using the Dual Etalon Fabry-Pérot Optical spectrometer (DEFPOS) with a 4' field of view, located at the coudé focus of the 150 cm RTT150 telescope at the TÜBİTAK National Observatory (TUG, Antalya, Turkey). Observations were carried out during the nights of 25-27 December 2015 and 6-7 June 2017 with different long exposure times ranging from 900 s to 3600 s. These spectra provide information about the local …
Structural And Permeability Characterization Of Zn-Li Ferrites, M H Mesbah Ahmed, A. K. M. Akther Hossain, Shamima Choudhury
Structural And Permeability Characterization Of Zn-Li Ferrites, M H Mesbah Ahmed, A. K. M. Akther Hossain, Shamima Choudhury
Turkish Journal of Physics
Structural characterization and magnetic properties of Zn-substituted Li ferrites with composition \linebreak Zn$_{x}$Li$_{0.45-x/2}$Fe$_{2.55-x/2}$O$_{4}$ (where x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) were studied by varying sintering temperature T$_{S}$ (where T$_{S}$ = 1000, 1050, 1100, 1150, 1200, and 1250 $^{\circ}$C) of the six samples. The single-phase cubic spinel structure was found by XRD patterns and scanning electron microscopy revealed the microstructure of all the samples. Permeability (real, $\mu_{i}'$ and imaginary, $\mu _{i}'')$ was found to increase with Zn substitution and also with sintering temperature. The real part of initial permeability ($\mu_{i}')$ was found to depend on the density and …
Solar Flare And Geomagnetic Activity Relations, Volkan Sarp, Ali̇ Kilçik
Solar Flare And Geomagnetic Activity Relations, Volkan Sarp, Ali̇ Kilçik
Turkish Journal of Physics
Two x-ray solar flare parameters (number of flares and peak flux) are compared to geomagnetic and space weather activity indices. The first solar flare parameter, X-ray solar flare number (SFN), is the total number of solar flares observed in a given month. The second one is the monthly maximum of X-ray solar flare peak fluxes (SFP). In order to compare these two parameters, both of them are cross-correlated with some other indices of geomagnetic activity (aa, Dst, and AE indices) and space weather (maximum coronal mass ejection speed index and solar wind speed). Maximum correlation was found ($\sim $0.63) between …
Function Mining For The $$-N$_{Ch}$ Correlations In Pp And Pp(Bar) Collisions Based On Symbolic Regression, Elsayed Eldahshan
Function Mining For The $$-N$_{Ch}$ Correlations In Pp And Pp(Bar) Collisions Based On Symbolic Regression, Elsayed Eldahshan
Turkish Journal of Physics
The investigation and analysis of the correlation between the mean transverse momentum () of charged particles and the charged particle multiplicity ($N_{ch}$) allow physicists to understand the contribution of multiple-parton interactions to the particle production mechanism. A symbolic regression (SR) method, based on gene expression programming (GEP), is proposed for mining a function that describes the -$N_{ch}$ correlation in proton-proton and proton-antiproton (pp and pp(bar)) collisions at collision energies from IRS to LHC. The discovered function simulates and models the correlation between and $N_{ch}$ in wide energy range $s^{1/2}$. In the framework of the proposed GEP model for $-N_{ch}$ correlation, …
Revealing The True Nature Of The Multiple System V822 Aql, Hi̇cran Bakiş
Revealing The True Nature Of The Multiple System V822 Aql, Hi̇cran Bakiş
Turkish Journal of Physics
Given the brightness, the V822 Aql multiple star system is photometric and spectroscopically neglected. In this study high-resolution echelle spectra of the system were obtained and were used to calculate the mass ratio of the system by determining the individual lines of the components for the first time. According to this, the close binary consists of two components revolving in a circular orbit with velocity semiamplitudes of K$_{1}$ = 45.5 $\pm $ 0.8 km/s and K$_{2}$ = 204.9 $\pm $ 0.9 km/s (q = 0.22 $\pm $ 0.01), respectively. In addition, the orbital period analysis showed a highly eccentric orbit …
Modeling And Simulation Of Czts-Perovskite Sandwiched Tandem Solar Cell, Ismaila Taiwo Bello, Mojoyinola Kofoworola Awodele, Oluwaseun Adedokun, Olusola Akinrinola, Ayodeji Oladiran Awodugba
Modeling And Simulation Of Czts-Perovskite Sandwiched Tandem Solar Cell, Ismaila Taiwo Bello, Mojoyinola Kofoworola Awodele, Oluwaseun Adedokun, Olusola Akinrinola, Ayodeji Oladiran Awodugba
Turkish Journal of Physics
In this research work, a solar cell capacitance simulator (SCAPS-1D) was used in the modeling and simulation of sandwiched perovskite solar cells (PSCSs) with a planar heterojunction structure in the arrangement of the sandwiched model (FTO/ZnO/CZTS/PSCS/CZTS/HTM). Two different configurations, 121 and 111, of the sandwiching absorber layer of the device were simulated and compared with the perovskite without sandwiching, using an absorber layer of step length thickness of 25 nm, and varied from 100 nm to 500 nm. The band gap diagram, I-V characteristics curve, and other parameters were constructed. The best configuration for better performance was then determined, from …
The Application Of Some Nuclear Potentials For Quasielastic Scattering Data Of The $^{11}$Li $+ ~ ^{28}$Si Reaction And Its Consequences, Murat Aygün
Turkish Journal of Physics
The aim of the present study is to provide a better understanding of the effect and applicability of nuclear potentials on scattering reactions. For this, we investigate the quasielastic scattering data of the $^{11}$Li $+ ~ ^{28}$Si reaction at 319 MeV within the framework of the optical model. In order to obtain the real part of the optical potential, we use ten different potentials, which consist of Proximity 1977 (Prox 77), Proximity 1988 (Prox 88), Broglia and Winther 1991 (BW 91), Aage Winther (AW 95), Christensen and Winther 1976 (CW 76), Bass 1973 (Bass 73), Bass 1977 (Bass 77), Bass …
Cosmic Censorship And The Third Law Of Black Hole Dynamics, Koray Düztaş
Cosmic Censorship And The Third Law Of Black Hole Dynamics, Koray Düztaş
Turkish Journal of Physics
Israel's proof of the third law of black hole dynamics is based on the semirigidity assumption, which requires that the areas of the outermost trapped surfaces are preserved. We argue that the condition that the area of the event horizon should not decrease is necessary -but not sufficient- for the semirigidity assumption to hold. It is known that the presence of a naked singularity in the exterior region invalidates Hawking's proof of the area theorem. In this sense, the third law assumes the validity of the strong form of the cosmic censorship conjecture, contrary to general acceptance. Still, one cannot …
Tailoring The Magnetic Anisotropy Of Cobalt-Gold Thin Films, Cengi̇z Okay, Peri̇han Aksu, Caner Deger, Fi̇kret Yildiz
Tailoring The Magnetic Anisotropy Of Cobalt-Gold Thin Films, Cengi̇z Okay, Peri̇han Aksu, Caner Deger, Fi̇kret Yildiz
Turkish Journal of Physics
Magnetic cobalt-gold thin films (Co$_{x}$Au$_{(1-x)})$ are grown on silicon (100) surfaces by using a sputter deposition technique. Magnetic anisotropy of the films is investigated by ferromagnetic resonance (FMR). Magnetic properties are explored by micromagnetic simulations based on the metropolis algorithm. Effective magnetic anisotropy is gradually increased with Co concentration. In-plane axial anisotropy exists for all samples and it is enhanced with a Co concentration of $\sim $40{\%}, corresponding optimal cluster size, and intercluster separation. Segregation and coalescence of Co clusters caused by different Co concentrations strongly affect magnetic properties of the thin films. Therefore, the study revealed that magnetic behavior …