Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Engineering (26)
- Materials Science and Engineering (19)
- Other Physics (18)
- Applied Mathematics (14)
- Social and Behavioral Sciences (9)
-
- Nuclear (8)
- Astrophysics and Astronomy (7)
- Chemistry (7)
- Life Sciences (7)
- Political Science (7)
- Biology (6)
- Fluid Dynamics (6)
- International Relations (6)
- Law (6)
- Ordinary Differential Equations and Applied Dynamics (6)
- Defense and Security Studies (5)
- National Security Law (5)
- Public Affairs, Public Policy and Public Administration (5)
- Business (4)
- Engineering Education (4)
- Mathematics (4)
- Medical Sciences (4)
- Medicine and Health Sciences (4)
- Nuclear Engineering (4)
- Numerical Analysis and Computation (4)
- Partial Differential Equations (4)
- Analysis (3)
- Atomic, Molecular and Optical Physics (3)
- Institution
- Keyword
-
- $f(R (2)
- Deceleration parameter (2)
- Heterostructure (2)
- High energy physics (2)
- Inhomogeneity (2)
-
- Levitation (2)
- Magnetic levitation (2)
- Modified couple stress theory (2)
- Monte Carlo method (2)
- Nuclear security culture (2)
- Poincare Surface of Section (2)
- T)$ gravity (2)
- Thermal Stresses (2)
- Thermoelasticity (2)
- $F^{\alpha}$-calculus (1)
- $M$1 excitations (1)
- $^{12}$C+$^{24}$Mg (1)
- $^{153}$Eu (1)
- (U-Pu)O$_{2}$ fuel (1)
- Accelerator magnets (1)
- Adsorption isotherm (1)
- Algol-stellar flares (1)
- Anisotropic scattering (1)
- Annealing (1)
- Anomalous codeposition (1)
- Antihydrogen production (1)
- Ar/N$_{2}$ mixture (1)
- Asymptotic convergence (1)
- Atomic and molecular physics (1)
- Atomic data (1)
- Publication
-
- Turkish Journal of Physics (61)
- Applications and Applied Mathematics: An International Journal (AAM) (20)
- Eurasian Journal of Physics and Functional Materials (18)
- Macalester Journal of Physics and Astronomy (8)
- International Journal of Nuclear Security (7)
-
- Journal of the South Carolina Academy of Science (6)
- Journal of Undergraduate Research (4)
- Exigence (2)
- Georgia Journal of Science (1)
- Interdisciplinary Journal of Problem-Based Learning (1)
- International Journal of Speleology (1)
- Journal of Pre-College Engineering Education Research (J-PEER) (1)
- Rocky Mountain Conference on Magnetic Resonance (1)
Articles 91 - 120 of 131
Full-Text Articles in Physics
Influence Of Silicon Dioxide Medium On The Structural And Electrical Properties Of Nickel Zinc Ferrite, Jacob George, Abraham Kutticheril Eapen
Influence Of Silicon Dioxide Medium On The Structural And Electrical Properties Of Nickel Zinc Ferrite, Jacob George, Abraham Kutticheril Eapen
Turkish Journal of Physics
Nickel zinc ferrite [(Ni$_{0.65}$Zn$_{0.35}$Fe$_{2}$O$_{4}) _{x}$ / (SiO$_{2}) _{1-x}$ where, x = 1.0, 0.85, 0.65, 0.50, 0.35, and 0.15] is synthesized using the glyoxylate precursor method. The synthesis, characterization, and electrical study of nickel zinc ferrites/SiO$_{2}$ powder with low dielectric constant, very low conductivity, and loss tangent with low frequency dispersion, suitable for good insulators, is reported here. X-ray diffraction, TGA, and FT-IR studies are employed for identifying crystalline phases and structure. Crystallite size is calculated by the Scherrer formula and Williamson--Hall equation and found to fall in the range of 4.9--25 nm. TEM of the samples shows spherical particles of …
Second Law Of Gravitational Thermodynamics In The Locally Rotationally Symmetric Bianchi Type-Ii Universe, Murat Korunur
Second Law Of Gravitational Thermodynamics In The Locally Rotationally Symmetric Bianchi Type-Ii Universe, Murat Korunur
Turkish Journal of Physics
In this work, under the assumption that the universe is locally rotationally symmetric (LRS) Bianchi type-II and filled with anisotropic dark fluid (dark energy and dark radiation), we investigate whether the generalized second law of thermodynamics (GSLT) is still valid. We also consider another important condition for LRS Bianchi type-II spacetimes whereby the model expansion $\theta $ is proportional to the shear $\sigma $, which leads to $B=A^{n}$ (where n is a constant and A and B are the metric potentials). Based on this, we derive a general circumstance for the GSLT and find that its validity depends on the …
Effect Of Uv And Gamma Rays On Bulk Etching Of The Pokalon Track Detector, Madhusoodanan Pdmajam Gangadathan, Venkidasubramanian Sankar, Nishanth Pothiyodathu, Krishna Muraleedhara Varier
Effect Of Uv And Gamma Rays On Bulk Etching Of The Pokalon Track Detector, Madhusoodanan Pdmajam Gangadathan, Venkidasubramanian Sankar, Nishanth Pothiyodathu, Krishna Muraleedhara Varier
Turkish Journal of Physics
Solid-state nuclear track detectors (SSNTDs) find applications in many fields of science and technology. Polycarbonates like CR-39 or Lexan are most widely used for such applications. Pokalon is a relatively new member of the polycarbonate family of SSNTDs. It has the same monomer as that of Makrofol. In the present work we have studied the bulk etching characteristics of Pokalon at different temperatures and normalities of NaOH etchant with and without magnetic stirring. The effect of UV and gamma irradiation on the bulk etch rate has also been studied. From the bulk etch rate values at different temperatures, we have …
Localization Of A Nonlocal Interaction, Ujjwal Laha, Sanjib Kr Das, Jhasaketan Bhoi
Localization Of A Nonlocal Interaction, Ujjwal Laha, Sanjib Kr Das, Jhasaketan Bhoi
Turkish Journal of Physics
A simple method for the localization of a separable nonlocal interaction is formulated in terms of Green's functions and the solutions with regular and irregular boundary conditions. The constructed energy--momentum-dependent local potential with regular boundary condition is real while that for the irregular boundary condition is complex in nature. The phase function method is exploited to compute elastic scattering phases for the nucleon--nucleon and alpha--nucleon systems. Reasonable agreements in scattering phase shifts with experimental data are obtained, particularly, in the low energy range for the systems under consideration. The phase shifts for the imaginary parts of the potentials derived from …
First-Principles Modeling Of Gan/Mose$_{2}$ Van Der Waals Heterobilayer, Celal Yelgel
First-Principles Modeling Of Gan/Mose$_{2}$ Van Der Waals Heterobilayer, Celal Yelgel
Turkish Journal of Physics
We investigate structural and electronic properties of the graphene-like gallium nitride (GaN) monolayer deposited on a MoSe$_{2}$ monolayer by using density functional theory with the inclusion of the nonlocal van der Waals correction. The GaN is bound weakly to the MoSe$_{2}$ monolayer with adsorption energy of 49 meV/atom. We find that the heterobilayer is energetically favorable with the interlayer distance of 3.302 {\AA} indicating van der Waals (vdW) type interaction and the most stable stacking configuration is verified with different deposition sequences. The heterostructure of GaN/MoSe$_{2}$ is found to be indirect band gap semiconductor with gap value of 1.371 eV. …
Magnetized Strange Quark Matter In Reconstructed $F(R,T)$ Gravity For Bianchi I And V Universes With Cosmological Constant, Can Aktaş
Turkish Journal of Physics
In this article, we have investigated the behaviors of magnetized strange quark matter distributions for Bianchi I and V universes in reconstructed $f?eft( R,T \right)=\alpha_{1}R+\alpha_{2}f_{3}(T)$ gravity (here $\alpha_{1}$ and $\alpha_{2}$ are constants; $f_{3}(T)$ is an arbitrary function of $T)$. To get solutions of the field equations we have used a deceleration parameter and the equation of state for strange quark matter. The new represented $f(R,T)$ model includes two models of Harko et al. and transforms to general relativity. When $t\to ınfty $, we get the dark energy model ($p=-\rho )$ in reconstructed $f?eft( R,T \right)=\alpha _{1}R+\alpha_{2}f_{3}(T)$ gravity. However, we obtain …
Monte Carlo Simulation Of A Medical Linear Accelerator For Filtered And Fff Systems, Çağri Yazğan, Yi̇ği̇t Çeçen
Monte Carlo Simulation Of A Medical Linear Accelerator For Filtered And Fff Systems, Çağri Yazğan, Yi̇ği̇t Çeçen
Turkish Journal of Physics
In order to simulate radiation transport, various algorithms, codes, and programs have been developed. In this study Monte Carlo N-particle code is used to simulate a medical electron linear accelerator gantry for research purposes. Detailed geometry of the LINAC head and water phantom are modeled and simulated for calculations. Analyses are made for filtered and flattening filter-free (FFF) systems. Percent depth dose and dose profile measurements are calculated with Monte Carlo simulations and compared with experimental and theoretical values for quality assurance of the model. Flux, dose, and spectrum analyses are performed for filtered and FFF systems separately. In this …
Analytical Solution Of The Local Fractional Klein-Gordon Equation For Generalized Hulthen Potential, Hasi̇be Hale Karayer, Ahmet Doğan Demi̇rhan, Fevzi̇ Büyükkiliç
Analytical Solution Of The Local Fractional Klein-Gordon Equation For Generalized Hulthen Potential, Hasi̇be Hale Karayer, Ahmet Doğan Demi̇rhan, Fevzi̇ Büyükkiliç
Turkish Journal of Physics
The one-dimensional Klein-Gordon (KG) equation is investigated in the domain of conformable fractional calculus for one-dimensional scalar potential, namely generalized Hulthen potential. The conformable fractional calculus is based on conformable fractional derivative, which is the most natural definition in noninteger order calculus. Fractional order differential equations can be solved analytically by means of this derivative operator. We obtained exact eigenvalue and eigenfunction solutions of the local fractional KG equation and investigated the evolution of relativistic effects in correspondence with the fractional order.
Applying A Self-Feedback Method To Control Chaos In The Buck Converter, Mei Mei Jia
Applying A Self-Feedback Method To Control Chaos In The Buck Converter, Mei Mei Jia
Turkish Journal of Physics
Chaos exists in the Buck converter due to the switching action of the controlled switch and this nonlinear phenomenon results in unreliable working performances. Hence, this paper uses a self-feedback control method with two adjustable parameters to suppress the chaotic behavior in the Buck converter. First, the self-feedback control method is presented by introducing a generic second-order chaotic system. Then, from the perspective of transfer functions obtained in terms of the piecewise linear model of the controlled Buck converter, effects of controller's parameters on system performances are discussed. On the basis of the Jacobian matrix of the discrete iterative mapping …
Magnet Design For The Storage Ring Of Turkay, Zafer Nergi̇z
Magnet Design For The Storage Ring Of Turkay, Zafer Nergi̇z
Turkish Journal of Physics
In synchrotron light sources the radiation is emitted from bending magnets and insertion devices (undulators, wigglers) placed on the storage ring by accelerating charged particles radially. The frequencies of produced radiation can range over the entire electromagnetic spectrum and have polarization characteristics. In synchrotron machines, the electron beam is forced to travel on a circular trajectory by the use of bending magnets. Quadrupole magnets are used to focus the beam. In this paper, we present the design studies for bending, quadrupole, and sextupole magnets for the storage ring of the Turkish synchrotron radiation source (TURKAY), which is in the design …
Monitoring Akkuyu Nuclear Reactor Using Antineutrino Flux Measurement, Sertaç Öztürk, Aytül Adigüzel, Veysi̇ Erkcan Özcan, Nafi̇z Gökhan Ünel
Monitoring Akkuyu Nuclear Reactor Using Antineutrino Flux Measurement, Sertaç Öztürk, Aytül Adigüzel, Veysi̇ Erkcan Özcan, Nafi̇z Gökhan Ünel
Turkish Journal of Physics
We present a simulation-based study for monitoring Akkuyu nuclear power plant's activity using antineutrino flux originating from the reactor core. A gadolinium-doped water Cherenkov detector was designed and optimization studies were performed using the Geant4 simulation toolkit. It was found that the bottom (or top) face of the target should be instrumented by six 10-inch-diameter photomultiplier tubes with photon detection efficiency of about 35% and the optimum Gd concentration was found to be about 0.3%-0.5%. The first study on the design of a monitoring detector facility for Akkuyu nuclear power plant is discussed in this paper.
Prompt Fission Neutron Energy Spectrum Of $^{252}Cf$ In Center Of Mass And Laboratory Systems, Mehmet Koçak, Humbat Ahmadov
Prompt Fission Neutron Energy Spectrum Of $^{252}Cf$ In Center Of Mass And Laboratory Systems, Mehmet Koçak, Humbat Ahmadov
Turkish Journal of Physics
In this work we discuss the influence of different forms of prompt fission neutron energy spectra in the fission fragment center of mass system on the laboratory spectrum of neutrons in spontaneous fission of $^{252}Cf$. We show that the Le Couteur spectrum, which takes into account multiple neutron emission of neutrons in the center of mass system, describes the observed neutron energy spectrum well when transformed to the laboratory system.
A Quartz Crystal Microbalance Study Of The Adsorption Of Benzene And Acetone Vapors Onto Coumarin-Substituted Manganese Phthalocyanine Film, Bi̇rsel Can Ömür, Ahmet Altindal
A Quartz Crystal Microbalance Study Of The Adsorption Of Benzene And Acetone Vapors Onto Coumarin-Substituted Manganese Phthalocyanine Film, Bi̇rsel Can Ömür, Ahmet Altindal
Turkish Journal of Physics
A novel coumarin-substituted manganese phthalocyanine (5) was successfully synthesized and used as sensing element for benzene and acetone vapor detection. The effects of water vapor on the benzene and acetone vapor-sensing properties and adsorption isotherms on thin film of 5 were also studied. Our preliminary results indicated that the presence of humidity modifies the baseline frequency but not the sensitivity of the sensor toward benzene and acetone vapors. Two isotherm models, Langmuir and Jovanovic isotherms, were selected to describe the adsorption process. Linear regression analysis, which is the most basic and commonly used predictive analysis method, was used to estimate …
Investigation Of Binary Co$_{2}$X (X = In, Si, Sb, Sn, Ga) Half-Heusler Alloys, Adewumi Isaac Popoola
Investigation Of Binary Co$_{2}$X (X = In, Si, Sb, Sn, Ga) Half-Heusler Alloys, Adewumi Isaac Popoola
Turkish Journal of Physics
The electronic structure and mechanical properties of some cobalt-based binary half-Heusler alloys Co$_{2}$X (X = In, Si, Sb, Sn, Ga) have been investigated using the density functional theory approach. The site preference by cobalt and X is similar to the traditional half-Heusler structure. The results showed that Co$_{2}$Si is not a half-metal but rather an n-type degenerate semiconductor. The compounds Co$_{2}$Ga, Co$_{2}$Sb, and Co$_{2}$Sn are thermodynamically unstable and Co$_{2}$In is elastically unstable. With much care given to the lattice size, half metallicity is readily predicted in Co$_{2}$In, Co$_{2}$Ga, Co$_{2}$Sn, and Co$_{2}$Sb. All the compounds showed directional bonding and they should …
Effect Of Pu Content On Uncertainty In Reactor Parameters Due To Use Of No Temperature Gradient In (U-Pu)O$_{2}$ Fuels, Mehmet Türkmen
Effect Of Pu Content On Uncertainty In Reactor Parameters Due To Use Of No Temperature Gradient In (U-Pu)O$_{2}$ Fuels, Mehmet Türkmen
Turkish Journal of Physics
Radial temperature distribution in a fuel rod is a parabolic function. Neutronics calculations are in general performed over a volume-averaged temperature by ignoring this distribution. Such an assumption results in an uncertainty in reactor design parameters. In this study, the magnitude of this uncertainty is estimated by solving the heat equation with a temperature-dependent conductivity coefficient coupled with a reactor physics code. The effect of radial fuel temperature distribution is investigated by representing the fuel region as multiregional. Uncertainty is investigated for various Pu contents of (U-Pu)O$_{2}$ fuel, a mix of depleted U and reactor-grade Pu. The effect of Pu …
Lightest And Heaviest Two-Neutron Halo Nuclei, $^{6}$He And $^{22}$C, Waleed Hwash
Lightest And Heaviest Two-Neutron Halo Nuclei, $^{6}$He And $^{22}$C, Waleed Hwash
Turkish Journal of Physics
The microscopic cluster model approach has been performed to study the nuclear structure of the lightest and heaviest two-neutron halo nuclei, $^{6}$He and $^{22}$C, respectively. The matter radius and binding energy for the $^{6}$He and $^{22}$C nuclei are calculated and the effect of the core deformation ($^{20}$C) on the properties of $^{22}$C nuclei is also discussed. Calculations have shown that the microscopic cluster model provides a good description of binding energy as well as matter radius in comparison to experimental data. The fittings of some parameters such as central potential depth (V$_{o})$, empirical constant (r$_{o})$, and surface diffuseness value (a) …
Bound States Of The Duffin-Kemmer-Petiau Equation For Square Potential Well With Position-Dependent Mass, Zoulikha Hammoud, Lyazid Chetouani
Bound States Of The Duffin-Kemmer-Petiau Equation For Square Potential Well With Position-Dependent Mass, Zoulikha Hammoud, Lyazid Chetouani
Turkish Journal of Physics
The effective mass Duffin-Kemmer-Petiau equation for spin 0 and spin 1 with a potential well is considered, and transcendental equations are derived for the energy eigenvalues. Numerical results are reported graphically, and the variations of the energy of the bound states are computed as a function of the well width and mass.
Phenomenological Potential Calculations For Cluster Decays, Asim Soylu
Phenomenological Potential Calculations For Cluster Decays, Asim Soylu
Turkish Journal of Physics
The half-lives of cluster decays from various nuclei having experimentally measured values have been calculated by using the Wentzel-Kramers-Brillouin method together with the Bohr-Sommerfeld quantization condition for three different types of phenomenological nuclear interactions: Woods-Saxon (WS), squared Woods-Saxon (WS-2), and mixed Woods-Saxon (mWS) potentials. By comparing the results with experimental values, rms values have been calculated. The half-lives of $^{14}$C, $^{15}$N, $^{16}$O, $^{17}$O, $^{18}$O, $^{20}$O, $^{22}$O, $^{23}$F, $^{22}$Ne, $^{24}$Ne, $^{25}$Ne, $^{26}$Ne, $^{28}$Mg, $^{30}$Mg, and $^{34}$Si decays from various isotopes whose experimental half-lives are unknown have also been calculated by using the WS, WS-2, and mWS potentials. The obtained results have …
Bound-Free Pair Production With A Correction Term In Relativistic Heavy-Ion Collisions, Melek Yilmaz Şengül
Bound-Free Pair Production With A Correction Term In Relativistic Heavy-Ion Collisions, Melek Yilmaz Şengül
Turkish Journal of Physics
In our previous work, we calculated bound-free electron-positron pair production cross section without a correction term. In this work, bound-free electron-positron pair production with a correction term is considered to calculate the cross section for peripheral relativistic heavy ion collisions. The Dirac wave functions have been used for the leptons and first order corrections are included. It is seen that the results for the production cross sections are considerably smaller than those of the previous calculations. We applied the same method for the calculations of the antihydrogen production cross sections as well.
A Dft Study On The Electronic Structure Of Tungsten Trioxide Polymorphs, Masoud Mansouri, Tahereh Mahmoodi
A Dft Study On The Electronic Structure Of Tungsten Trioxide Polymorphs, Masoud Mansouri, Tahereh Mahmoodi
Turkish Journal of Physics
Tungsten trioxide ($WO_{3})$ is an intermediate product in the recovery of tungsten from its minerals. Recently, it has attracted increasing attention due to its exclusive structural properties and its high potential in electronic applications. The crystal lattice of tungsten trioxide is highly dependent on temperature. In this paper we investigated the equilibrium structure of tungsten trioxide in four crystal systems, i.e. monoclinic system, tetragonal system, orthorhombic system, and cubic system. We did our first principle calculations using a pseudopotential model based on the spin dependent density functional theory and implementing generalized gradient approximation for exchange correlation energy. In each case, …
Linear Instability Of Dust Acoustic Waves In A Magnetized Gravitating Plasma In The Presence Of Dust Streaming, Himangshu Sahoo, Basudev Ghosh, Kalyan Kumar Mondal
Linear Instability Of Dust Acoustic Waves In A Magnetized Gravitating Plasma In The Presence Of Dust Streaming, Himangshu Sahoo, Basudev Ghosh, Kalyan Kumar Mondal
Turkish Journal of Physics
Linear instability of dust acoustic waves (DAWs) has been theoretically studied in a collisionless gravitating dust-ion magnetized plasma including the effect of dust streaming. A linear dispersion relation has been derived by using the method of normal mode analysis. Gravitational effect is found to make the low-frequency DAW mode linearly unstable in certain parametric regions. The dependence of the growth rate of the instability on various plasma parameters such as streaming of dust particles, size of the dust grain, strength of the magnetic field, obliqueness of propagation, and number density of dust particles has been numerically analyzed and presented graphically.
Identification Of The Hadronic Interaction Layer In A Highly Granular Calorimeter By Multivariate Techniques, Burak Bi̇lki̇
Identification Of The Hadronic Interaction Layer In A Highly Granular Calorimeter By Multivariate Techniques, Burak Bi̇lki̇
Turkish Journal of Physics
Calorimetry in future and upgrade collider detectors has a clear overall trend towards high granularity, both laterally and longitudinally. This trend is a requirement for the full exploitation of particle flow algorithms, which reconstruct individual particles using the subdetector that provides the best resolution for this specific particle. The increased level of detail in the event topologies due to higher segmentation of the calorimeter provides additional handles for several calorimetric measurements, such as the identification of the hadronic interaction layer, which is not possible for calorimeters with traditional tower geometry. Here, the power of using multivariate statistical techniques in the …
Design Studies For The Beam Position Monitor (Bpm) Front-End Electronics Of The Turkish Accelerator And Radiation Laboratory In Ankara (Tarla), Ayhan Aydin, Ergün Kasap
Design Studies For The Beam Position Monitor (Bpm) Front-End Electronics Of The Turkish Accelerator And Radiation Laboratory In Ankara (Tarla), Ayhan Aydin, Ergün Kasap
Turkish Journal of Physics
A beam diagnostics system is vitally important to operate all accelerator-based facilities. The system provides information about beam characteristics and enables requested beam parameters to be achieved. The main parameters, such as beam energy, current, emittance, and beam position, must be diagnosed and controlled during the operation of an accelerator. Beam position monitors (BPMs) are an essential tool for diagnosing a system of accelerators. They are used to define the position of the beam traversing through the beam pipe at relativistic speed. These tools can be used to achieve the required beam quality as well as protecting the entire system …
Investigation Of Excitation Functions Of Proton-Induced Reactions On $^{94, 96, 98, 100}$Mo Targets For Production Of Radioisotopes $^{94m, 94g, 96m, 96g, 96, 99m}$Tc, Ozan Artun, Hüseyi̇n Ayteki̇n
Investigation Of Excitation Functions Of Proton-Induced Reactions On $^{94, 96, 98, 100}$Mo Targets For Production Of Radioisotopes $^{94m, 94g, 96m, 96g, 96, 99m}$Tc, Ozan Artun, Hüseyi̇n Ayteki̇n
Turkish Journal of Physics
In this work, we investigated the excitation functions of proton-induced reactions on even-even $^{94-100}$Mo isotopes for the production of medical radioisotopes $^{94m, 94g, 96m, 96g, 96, 99m}$Tc. To obtain the excitation functions we carried out cross-section calculations in the frameworks of the generalized superfluid model, microscopic level density model, and three options of the preequilibrium process in the Talys code. The aim of this study was to introduce a new aspect for the production of radioisotopes $^{94m, 94g, 96m, 96g, 96, 99m}$Tc with different models.
Remarks On The Treatments Of Nonsolvable Potentials, Bülent Gönül, Yücel Cançeli̇k
Remarks On The Treatments Of Nonsolvable Potentials, Bülent Gönül, Yücel Cançeli̇k
Turkish Journal of Physics
A recently introduced scheme is extended to propose an algebraic nonperturbative approach for the analytical treatment of Schrödinger equations with nonsolvable potentials involving an exactly solvable potential form together with an additional potential term. As an illustration the procedure is successfully applied to the Cornell potential by means of very simple algebraic manipulations. However, instead of providing numerical eigenvalues for the only consideration of the small strength of the related linear potential as in the previous reports, the present model puts forward a clean route to interpret related experimental or precise numerical results involving a wide range of the linear …
Enhanced Electro-Optic Modulation Of Linbo$_{3}$-Based Photonic Crystal Cavities With Dual Mode And Polarization Operation, Fulya Bağci, Gökhan Kurt, Bariş Akaoğlu, Ekmel Özbay
Enhanced Electro-Optic Modulation Of Linbo$_{3}$-Based Photonic Crystal Cavities With Dual Mode And Polarization Operation, Fulya Bağci, Gökhan Kurt, Bariş Akaoğlu, Ekmel Özbay
Turkish Journal of Physics
A high output transmission and high quality factor, compact LiNbO$_{3}$-based Fabry-Perot-type photonic crystal cavity is reported that can be used in electro-optical modulators at optical communication wavelengths. The electro-optic effect is 123 times enhanced as compared to the bulk material as a result of the slow light effect. The transmission wavelength is found to depend linearly on the applied voltage with 1.2 nm/V modulation sensitivity. Moreover, an externally switchable dual mode regime with high quality factors and transmissions is realized. High transmissions and high quality factors are also obtained for both transverse-electric and transverse-magnetic polarizations simultaneously.
Achieving Carrier And Photon Confinement In Ga(Nasp)/Algap/Gap Qws On Si Substrates, Ömer Lütfi̇ Ünsal, Beşi̇re Gönül
Achieving Carrier And Photon Confinement In Ga(Nasp)/Algap/Gap Qws On Si Substrates, Ömer Lütfi̇ Ünsal, Beşi̇re Gönül
Turkish Journal of Physics
A detailed comparative theoretical analysis on both carrier and photon confinement of dilute nitride direct bandgap GaN$_{x}$As$_{1-x-y}$P$_{y}$ with that of GaAs$_{1-y}$P$_{y}$ on Si substrates is presented. Model calculations indicate that optical confinement factor of GaAs$_{1-y}$P$_{y}$/GaP is greater than that of GaN$_{x}$As$_{1-x-y}$P$_{y}$/GaP for all concentrations. We have demonstrated that one can improve the optical confinement factor of GaN$_{x}$As$_{1-x-y}$P$_{y}$/GaP by using an Al$_{z}$Ga$_{1-z}$P cladding layer.
Decomposition Of The Absorbed Dose By Let In Tissue-Equivalent Materials Within The Shield-Hit Transport Code, Nikolai Sobolevsky, Alexander Botvina, Ni̇hal Büyükçi̇zmeci̇, Ayşegül Kaya, Ludmila Latysheva, Riza Oğul
Decomposition Of The Absorbed Dose By Let In Tissue-Equivalent Materials Within The Shield-Hit Transport Code, Nikolai Sobolevsky, Alexander Botvina, Ni̇hal Büyükçi̇zmeci̇, Ayşegül Kaya, Ludmila Latysheva, Riza Oğul
Turkish Journal of Physics
The SHIELD-HIT transport code, in several versions, has been used for modeling the interaction of therapeutic beams of light nuclei with tissue-equivalent materials for a long time. All versions of the code include the useful option of decomposition of the absorbed dose by the linear energy transfer (LET), but this option has not been described and published to date. In this work the procedure of decomposition of the absorbed dose by LET is described and illustrated by using the decomposition of the Bragg curve in a water phantom, irradiated by beams of protons, alpha particles, and ions of lithium and …
Possible Variations In Sunspot Groups Before Flaring Activity During Solar Cycles 23 And 24, Ali̇ Kilçik, Seray Şahi̇n
Possible Variations In Sunspot Groups Before Flaring Activity During Solar Cycles 23 And 24, Ali̇ Kilçik, Seray Şahi̇n
Turkish Journal of Physics
We investigated the possible morphological variations observed in sunspot groups on the day before flaring activity occurred between January 1996 and November 2014. We found that 77% of all flaring sunspot groups were large and complex (D, E, and F modified Zurich classes). In addition, the Zurich classification of A, B, and C class sunspot groups changed more than 50%, while the remaining groups (D, E, F, and H) did not change considerably before the flare activity. Results showed that there was a remarkable increase in the sunspot areas of groups D, E, and F; in contrast, the sunspot areas …
Investigation Of A Novel Temperature-Sensing Mechanism Based On Strain-Induced Optical Path-Length Difference In A Multicore Optical Fiber, Belkis Gökbulut, Sema Güvenç, Mehmet Naci̇ İnci̇
Investigation Of A Novel Temperature-Sensing Mechanism Based On Strain-Induced Optical Path-Length Difference In A Multicore Optical Fiber, Belkis Gökbulut, Sema Güvenç, Mehmet Naci̇ İnci̇
Turkish Journal of Physics
A four-core optical fiber is employed to investigate a novel temperature-sensing mechanism, which is based on the strain-induced optical path-length difference between the fiber core pairs. A short segment of a four-core fiber is wound around a solid stainless steel cylinder to form a tight circular loop, which is exposed to temperatures of up to 100 $^{\circ}$C. Temperature-induced radial expansion of the stainless steel cylinder causes a shear strain in the fiber and introduces an optical path-length difference between the fiber core pairs. This results in a total phase shift of about 20.40 $\pm $ 0.29 rad in the interference …