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Articles 6481 - 6510 of 10319
Full-Text Articles in Physical Sciences and Mathematics
Middle-Upper Miocene Paleogeography Of Southern Turkey: Insights From Stratigraphy And Calcareous Nannofossil Biochronology Of The Olukpınar And Başyayla Sections (Mut-Ermenek Basin), Paola Cipollari, Eva Halásová, Kemal Gürbüz, Domenico Cosentino
Middle-Upper Miocene Paleogeography Of Southern Turkey: Insights From Stratigraphy And Calcareous Nannofossil Biochronology Of The Olukpınar And Başyayla Sections (Mut-Ermenek Basin), Paola Cipollari, Eva Halásová, Kemal Gürbüz, Domenico Cosentino
Turkish Journal of Earth Sciences
The age of the marine succession capping the basement rocks of the central Taurides in the Mut-Ermenek Basin is constrained using calcareous nannofossil biochronology. The Olukpınar section, which correlates with the biozones between MNN5a and MNN6b (late Langhian-late Serravallian), represents a deeper marine environment developed lateral to the Ermenek platform. The long-term transgressive-regressive cycle of the Olukpınar section, which corresponds to the middle-upper part of the TB2 supercycle, can be subdivided into 2 large-scale (10^6 years) cycles (TB2.4 and TB2.5) based on the occurrence of 2 major debris flow deposits linked to sea-level drop. The younger late Tortonian Başyayla section …
Preliminary Geoelectrical Identification Of A Low-Temperature Hydrothermal System In The Anzer Glacial Valley, İkizdere, Rize, Turkey, Abdullah Karaman
Preliminary Geoelectrical Identification Of A Low-Temperature Hydrothermal System In The Anzer Glacial Valley, İkizdere, Rize, Turkey, Abdullah Karaman
Turkish Journal of Earth Sciences
The Anzer glacial valley, at an elevation of over 2300 m in the Eastern Black Sea region of Turkey, exhibits evidence for a low-temperature hydrothermal system (40-100 °C). Low-temperature hydrothermal systems usually do not receive attention since they are not useful for energy production. However, in areas where natural beauty is prominent, as in the Anzer valley, such resources can easily trigger investment for all-season resorts that significantly contribute to the economy. In this study, we examine the site evidence and carry out self-potential and dc-resistivity sounding surveys using a Schlumberger electrode configuration. The resistivity cross-section obtained from the inversion …
Dkp Equation Under Scalar And Vector Kratzer Potentials, Bentol Hoda Yazarloo, Hassan Hassanabadi, Saber Zarrinkamar
Dkp Equation Under Scalar And Vector Kratzer Potentials, Bentol Hoda Yazarloo, Hassan Hassanabadi, Saber Zarrinkamar
Turkish Journal of Physics
Approximate analytical solutions of Duffin-Kemmer-Petiau (DKP) equation under scalar and vector Kratzer terms are obtained via an elegant ansatz after successive transformations. The results, after application of proper fits, can be used in the study of relativistic spinless particles in various branches of physics such as cosmology and theoretical nuclear physics including meson spectroscopy.
Empirical Rule For The Pair Break Mechanism In Three-Quasiparticle Rotational Bands, Sukhjeet Singh Dhindsa, Sushil Kumar, Jatinder Kumar Sharma
Empirical Rule For The Pair Break Mechanism In Three-Quasiparticle Rotational Bands, Sukhjeet Singh Dhindsa, Sushil Kumar, Jatinder Kumar Sharma
Turkish Journal of Physics
An empirical rule on the basis of odd-even mass difference is suggested for the breaking of a proton pair or a neutron pair in odd-A nuclei to form a lower lying 3-quasiparticle state. If \Delta_p is smaller than \Delta_n, the proton pair breaks; on the other hand, if \Delta_n is smaller than \Delta_p, the neutron pair breaks down and forms a lower lying 3-quasiparticle state in an odd-A nuclide. This rule appears not only purely based on the proton paring/neutron pairing energy balancing condition but also on particular excitation energy, which is \ge 1 MeV in the case of the …
Generating Systems Of Differential Invariants And The Theorem On Existence For Curves In The Pseudo-Euclidean Geometry}, Djavvat Khadjiev, İdri̇s Ören, Ömer Pekşen
Generating Systems Of Differential Invariants And The Theorem On Existence For Curves In The Pseudo-Euclidean Geometry}, Djavvat Khadjiev, İdri̇s Ören, Ömer Pekşen
Turkish Journal of Mathematics
Let M(n, p) be the group of all motions of an n-dimensional pseudo-Euclidean space of index p. It is proved that the complete system of M(n,p)-invariant differential rational functions of a path (curve) is a generating system of the differential field of all M(n,p)-invariant differential rational functions of a path (curve), respectively. A fundamental system of relations between elements of the complete system of M(n,p)-invariant differential rational functions of a path (curve) is described.
A Different Point Of View: A Continuous Tracing Of Acid-Base Titration With Fiber-Optic Sensor, Şerafetti̇n Yaltkaya, Esra Kendi̇r
A Different Point Of View: A Continuous Tracing Of Acid-Base Titration With Fiber-Optic Sensor, Şerafetti̇n Yaltkaya, Esra Kendi̇r
Turkish Journal of Physics
Our main aim was to investigate variations in the refractive index of a solution during chemical reaction. The variation of refractive index was measured through the entire acid--base titration process, especially near the equivalence point. To determine the equivalence point, the conductivity of the solution and the refractive index were measured simultaneously. In this preliminary study, sodium hydroxide and hydrochloric acid were used as the base and the acid solution, respectively. To measure the refractive index variation, a fiber-optic refractive index sensor was designed. The fiber-optic probe was dipped into the solution and acted as a refractive index sensor according …
Development And Utilization Of A Retarding Analyzer For Field Emission Investigation Of Lab_6/W Emitter, Ahmed Abdurrahman Ahmed Al-Tabbakh, Mahendra A. More, Dilip S. Joag
Development And Utilization Of A Retarding Analyzer For Field Emission Investigation Of Lab_6/W Emitter, Ahmed Abdurrahman Ahmed Al-Tabbakh, Mahendra A. More, Dilip S. Joag
Turkish Journal of Physics
A cold field emission from LaB_6/W-coated cathodes has been investigated with a high-accuracy and low-cost retarding field analyzer instrument. Guidelines are provided for measurements of Fowler-Nordheim (FN) characteristics and total energy distributions using a single set-up and direct detection technique to address presumed shortages in sophisticated instrumental requirements for integral investigation. Electron emission from LaB_6 nanoprotrusions, deposited on a tungsten microtip, was successfully investigated. Results emphasize a metallic behavior of the emitter in accordance with the FN theory. No size effects were observed for protrusions of 300 nm in radii.
Emerging Multi-Proxy Records Of Late Quaternary Palaeoclimate Dynamics In Turkey And The Surrounding Region, Kathleen Nicoll, Ceren Küçükuysal
Emerging Multi-Proxy Records Of Late Quaternary Palaeoclimate Dynamics In Turkey And The Surrounding Region, Kathleen Nicoll, Ceren Küçükuysal
Turkish Journal of Earth Sciences
We present an overview of selected papers published since 2000 that interpret Late Quaternary multi-proxy palaeoclimate records from Turkey and the surrounding region of the Near-Middle East and Mediterranean region. Existing records in Turkey are rather limited in their resolution, and the locations studied thus far reflect a limited spatial and temporal distribution. Because Turkey is a very large country with numerous mountains that affect local weather conditions and create complex feedbacks, it is difficult to correlate trends across the broad landscape, and beyond. Published instrumental records are too short, and most palaeoclimate proxy records, including many lakes studied in …
A Unified Approach To Speech Enhancement And Voice Activity Detection, Ceyhan Kasap, Mustafa Levent Arslan
A Unified Approach To Speech Enhancement And Voice Activity Detection, Ceyhan Kasap, Mustafa Levent Arslan
Turkish Journal of Electrical Engineering and Computer Sciences
In this paper, a unified system for voice activity detection (VAD) and speech enhancement is proposed. In the proposed system, there is mutual exchange of information between VAD and speech enhancement blocks. A new and robust VAD algorithm is implemented for the VAD block of the unified system. The newly proposed VAD algorithm uses a periodicity measure and an energy measure obtained from spectral energy distribution and spectral energy difference of the input speech data. For the speech enhancement block, the modified Wiener filtering (MWF) approach is utilized. It has been shown that the utilization of information exchange between the …
Quantitative Characterization Of Atmospheric Desert Particles Via Multispectral Lidar Method (Uv To Ir), Using Genetic Algorithms And Compared With Chomette\'S Mode, Samir Zeghbib, Samia Bouzid, Abdelhafid Chaabi
Quantitative Characterization Of Atmospheric Desert Particles Via Multispectral Lidar Method (Uv To Ir), Using Genetic Algorithms And Compared With Chomette\'S Mode, Samir Zeghbib, Samia Bouzid, Abdelhafid Chaabi
Turkish Journal of Physics
Size distribution of desert aerosols was measured via LiDAR multi-spectral method using laser wavelengths from UV to mid-IR \lambda = 0.193, 0.694, 1.064, 3.370 and 10.60 \mu m, and applying statistical Markov chains and genetic algorithms. Our results are compared later with the well-known Chomette's desert model.
Orthogonal Systems In L^2 Spaces Of A Vector Measure, Eduardo Jiménez Fernández
Orthogonal Systems In L^2 Spaces Of A Vector Measure, Eduardo Jiménez Fernández
Turkish Journal of Mathematics
Let m:\Sigma \to X be a Banach space valued countably additive vector measure. In this paper we present a procedure to construct an m-orthogonal system in the space L^2(m) of square integrable functions with respect to m. If the vector measure is constructed from a family of indeterminate scalar measures, it is possible to obtain a family of polynomials that is orthogonal with respect to this vector measure. On the other hand, if the vector measure is fixed, then we can obtain sequences of orthogonal functions using the Kadec-Pelczynski disjointification method.
Symmetry And The Order Of Events In Time: Description Of A Reversible Thermal Energy Converter Composed Of Negative Mass, Randy Wayne
Turkish Journal of Physics
In a previous paper [1], we analyzed the sequence of events that occurs in the time domain of a reversible cyclical thermal energy converter using the Gibbs equation and showed that even when there is no net change of entropy there is an asymmetrical order of quasi-static states along the time axis, when thermal energy is converted into mechanical pressure-volume work. The spontaneous evolution towards an equilibrium state, which is characterized by the unidirectional transport of entropy from the hot reservoir to the cold reservoir, is coincident with this asymmetrical order of events. In this paper, we \"mend\" the above …
Thermodynamic Properties Of The Noncommutative Black Hole In (Z = 3)-Horava-Lifshitz Gravity, Mourad Nach, Khadija Bilal, My Brahim Sedra, Abderrahman El Boukili
Thermodynamic Properties Of The Noncommutative Black Hole In (Z = 3)-Horava-Lifshitz Gravity, Mourad Nach, Khadija Bilal, My Brahim Sedra, Abderrahman El Boukili
Turkish Journal of Physics
In this work, we investigate the effects of noncommutative spaces on the Horava-Lifshitz black hole. We construct the black hole solutions in the noncommutative space of (z = 3)-Horava-Lifshitz gravity. We calculate the horizon and the thermodynamic properties such as the Hawking temperature, the ADM-Mass, and entropy, which reduce to their commutative limits when the noncommutativity parameter tends to zero.
Temperature Dependence For The Synthetic Magnetization Of A Rotating Bose Gas In Harmonic Trap, Azza M. Elbadry
Temperature Dependence For The Synthetic Magnetization Of A Rotating Bose Gas In Harmonic Trap, Azza M. Elbadry
Turkish Journal of Physics
In this paper, the temperature dependence for synthetic magnetization \bar M of a rotating Bose gas in harmonic trap and the magnetic field dependence of the critical temperature are investigated. A simple semiclassical approximation for the density of state approach is used in this study. The suggested approach simultaneously gives corrections to quantities which arise from the finite size and interatomic interaction effects. The calculated results show that the critical temperature decreases due to the increase of the synthetic magnetic field. The synthetic magnetization also exhibits a characteristic temperature dependence. It is proportional to T^3 if \bar T < \bar T_c, while it is proportional to T if \bar T > \bar T_c. …
One Proton Emission With Structural Effects In Medium Mass Nuclei, Chandrasekaran Anu Radha, Velayudham Ramasubramanian
One Proton Emission With Structural Effects In Medium Mass Nuclei, Chandrasekaran Anu Radha, Velayudham Ramasubramanian
Turkish Journal of Physics
In this work proton emission from deformed nuclei is discussed with the quadrupole deformation values. The deformation is investigated using potential energy surface plots. The identified proton emitters are found to have odd Z since the unpaired proton is less bound, and they are readily available for emission. Using the exotic decay model to the medium mass nuclei, the new proton emitters are analyzed with the inclusion of centrifugal barrier. The proton decay half-lives are calculated and compared with literature values. A discussion pertaining to single proton emission with structural effect will be a pivotal point in our study.
Spin Assignment And Behavior Of Superdeformed Bands In A\\Sim 150 Mass Region, Ali Khalaf, Manal Sirag, Mahmoud Taha
Spin Assignment And Behavior Of Superdeformed Bands In A\\Sim 150 Mass Region, Ali Khalaf, Manal Sirag, Mahmoud Taha
Turkish Journal of Physics
The smoothed experimental dynamical moment of inertia J^{(2)} values were fitted with a theoretical version using the Harris three parameter formula in even powers of angular frequency \omega, derived for results from the cranking model. The expansion parameters were adjusted by using a computer simulated search program. The best expansion parameters from the fit were used to assign the spins of the superdeformed (SD) rotational bands (RB) by integrating the calculated J^{(2)}. The data set includes 23 RB's in 11 SD nuclei, which show no evidence of either irregular behavior near the bottom of the bands or abrupt angular momentum …
Spin-One Dkp Equation In The Presence Of Nonminimal Vector Woods-Saxon Potential In (1 + 1) Dimensions, Hassan Hassanabadi, Zahra Molaee, Saber Zarrinkamar
Spin-One Dkp Equation In The Presence Of Nonminimal Vector Woods-Saxon Potential In (1 + 1) Dimensions, Hassan Hassanabadi, Zahra Molaee, Saber Zarrinkamar
Turkish Journal of Physics
The Duffin-Kemmer-Petiau equation in the presence of a nonminimal vector Woods-Saxon potential is solved for spin-one particles via the Nikiforov-Uvarov method. The reflection and transmission coefficients of the general form of the DKP equation in the presence of a nonminimal vector interaction are discussed.
The Nonrelativistic Molecular Tietz Potential, Hossein Nikoofard, Elham Maghsoodi, Saber Zarrinkamar, Mohsen Farhadi, Hassan Hassanabadi
The Nonrelativistic Molecular Tietz Potential, Hossein Nikoofard, Elham Maghsoodi, Saber Zarrinkamar, Mohsen Farhadi, Hassan Hassanabadi
Turkish Journal of Physics
We solve the 3-dimensional Schrödinger equation under the Tietz potential by an approximate analytical scheme. A Pekeris-type approximation and the Nikiforov--Uvarov technique are used in the calculations to report the arbitrary-state eigenfunctions and eigenvalues and we calculate some useful expectation values of the Tietz potential using the Hellmann-Feynman theorem and obtain the oscillator strength.
Investigation Of Dominant States In The Collisions Of Ar Vii And Kr Xxiv With H_2 And He Targets, Abdel Aziz Habib, Alaa Abo Zalam, Hassan Ramadan
Investigation Of Dominant States In The Collisions Of Ar Vii And Kr Xxiv With H_2 And He Targets, Abdel Aziz Habib, Alaa Abo Zalam, Hassan Ramadan
Turkish Journal of Physics
In thermal plasma, the ion--atom collisions proceed most probably through resonance processes. One of the important processes is the resonant transfer excitation followed by emission of X-rays (RTEX), which causes self-cooling for plasma. In addition, it is identical to the dielectronic recombination (DR) in electron-ion collisions. The present work deals with the calculation of DR cross-sections (\sigma^{DR}s) and DR rate coefficients (\alpha^{DR}s) as well as RTEX cross-sections (\sigma^{RTEX}s) for Mg-like ions [Ar^{6+} and Kr^{24+}] with L-shell and K-shell excitation for \Deltan = 0 and \Delta n \neq 0. Comparison between the present results and other calculations for the rates are …
Study Of Zone Center Phonons In Wolframite Znwo_4, Ruby Jindal, Murari Mohan Sinha, Hem Chandra Gupta
Study Of Zone Center Phonons In Wolframite Znwo_4, Ruby Jindal, Murari Mohan Sinha, Hem Chandra Gupta
Turkish Journal of Physics
A short-range force constant model was applied to investigate the phonons in wolframite ZnWO_4 crystals in their monoclinic phase having space group P2/c and symmetry C_{2h}. The normal symmetry coordinates for the monoclinic wolframite were computed. The zone center phonons were calculated by using 8 stretching and 6 bending force constants. The calculated results are in very good agreement with the observed ones. The infrared frequencies were assigned for the first time. The potential energy distribution was also investigated for determining the significance of the contribution from each force constant toward the Raman and infrared wavenumbers.
A Simple Method To Extract The Parameters Of The Single-Diode Model Of A Pv System, Ahmed A. El Tayyan
A Simple Method To Extract The Parameters Of The Single-Diode Model Of A Pv System, Ahmed A. El Tayyan
Turkish Journal of Physics
This article suggests a simple method of modeling and simulation of photovoltaic systems. The main goal is to find the parameters (I_{ph}, I_o, R_s, R_{sh}, and a) of the single-diode model by adjusting the P-V curve and/or I-V curve at parameters provided by the manufacturer specification sheets (I_{sc}, V_{oc}, I_{mp}, and V_{mp}). An empirical model is incorporated into the single-diode model in order to remove its implicit nature and to ease the calculations. Calculations using this method can be extended to generate the I-V curves at temperatures and irradiances other than the standard test condition (STC)
Improved Hilbert Moment Thermal Qcd Sum Rules For B_S Meson And Stability With Respect To Moment Parameter, Elşen Veli̇, Gülşah Kaya, Arzu Türkan, Eni̇s Yazici
Improved Hilbert Moment Thermal Qcd Sum Rules For B_S Meson And Stability With Respect To Moment Parameter, Elşen Veli̇, Gülşah Kaya, Arzu Türkan, Eni̇s Yazici
Turkish Journal of Physics
In this paper, we deal with the temperature dependence of the leptonic decay constant and mass of B_s meson in the framework of the Hilbert moment QCD sum rule. In our calculations, we improve the thermal QCD sum rules, taking into account the thermal spectral density and the perturbative 2-loop order corrections to the correlation function. Moreover, we investigate the stability of the results with respect to the Hilbert moment parameter. Our numerical calculations demonstrate that the mass and decay constant are insensitive to the variation of temperature up to T \cong 100 MeV; however, after this value, they start …
Kantowski-Sachs Cosmological Model With Wet Dark Fluid In The General Theory Of Relativity, Arun Ravishankar, Bivudutta Mishra, Pradyumn Kumar Sahoo
Kantowski-Sachs Cosmological Model With Wet Dark Fluid In The General Theory Of Relativity, Arun Ravishankar, Bivudutta Mishra, Pradyumn Kumar Sahoo
Turkish Journal of Physics
The purpose of this study was to investigate the role of wet dark fluid (WDF) in Kantowski-Sachs space-time in the general theory of relativity. In this theory, we solved the field equations for the case where \rho _{WDF}=-2p_{WDF}. Various physical and geometrical properties of the model are also discussed.
A Fission Model Approach To Alpha Decay And Cluster Radioactivity Of Dy, Er, And Yb Isotopes, Kizhakkath Kalam Girija, Antony Joseph
A Fission Model Approach To Alpha Decay And Cluster Radioactivity Of Dy, Er, And Yb Isotopes, Kizhakkath Kalam Girija, Antony Joseph
Turkish Journal of Physics
Rare earth nuclei are probable candidates for exhibiting cluster radioactivity. In the present work, a theoretical study of alpha decay and heavy cluster emission from Dy, Er, and Yb nuclei in the mass range 150 < A < 190 has been carried out in a fission model approach. Some of the proton-rich isotopes of these nuclei are found to have long half-lives, but within the measurable range. Many of the neutron-rich isotopes under consideration are far from beta stability and the most probable light clusters predicted are highly exotic in nature and the corresponding half-lives are extremely short. However, the decays of most probable heavy clusters predicted have half-lives in the measurable range. The calculations on neutron-rich isotopes indicate the emergence of new magic numbers for protons and neutrons. The centrifugal barrier effect on decay rate of some proton-rich Er isotopes is also investigated.
The Development Of A Novel Technique To Evaluate The Cr-39 Track Response To Alpha Particles, Khalil Ibrahim Mohammad, Muzahim Ibrahim Azawe
The Development Of A Novel Technique To Evaluate The Cr-39 Track Response To Alpha Particles, Khalil Ibrahim Mohammad, Muzahim Ibrahim Azawe
Turkish Journal of Physics
A novel technique is presented for the assessment of the track response of the detector CR-39 to alpha particles by photothermal deflection spectroscopy and image analysis. The 2 new techniques can be implemented to CR-39 as in situ measurements. The proposed techniques offer the possibility of monitoring nuclear radiation directly. Photothermal deflection is described to detect the change in the thermal and optical properties of the track nuclear detector CR-39 when irradiated to alpha particles. In situ image analysis of the photothermal deflection spot is presented to assess the detection of the CR-39 of any nuclear particle or radiation instantaneously.
Equilibrium Shapes And Deformations Of Some Rare Earth Nuclei In Cranked Nilsson-Strutinsky Shell Correction Approach, Antony Joseph, Kizhakkath Kalam Girija
Equilibrium Shapes And Deformations Of Some Rare Earth Nuclei In Cranked Nilsson-Strutinsky Shell Correction Approach, Antony Joseph, Kizhakkath Kalam Girija
Turkish Journal of Physics
The nuclear potential energies of neutron-deficient even-even rare earth nuclei ^{150-160}Dy, ^{150-160}Er, ^{150-160}Yb, ^{158,162,166-176}Hf, ^{160,164-178}W, and ^{162,166,170-180}Os are computed within the framework of the cranked Nilsson--Strutinsky shell correction method. The ground state potential energy surface diagrams of these nuclei are analysed in terms of quadrupole deformation and the triaxiality parameter. The nuclear shapes and deformations in the ground state are found to be functions of Z and N. Even though most of the isotopes in this region seem to be prolate in the ground state, oblate and triaxial shapes are also predicted for some isotopes. It is also found that …
The Effect Of Neutron Irradiation On The Properties Of Tl_{0.6}Pb_{0.3}Cd_{0.1}Ba_2ca_2cu_{3}O_{9-Delta} Superconductors, Kareem Ali Jasim, Tariq Jaffar Alwan, Khalid Hadi Mahdi, Hazim Louis Mansour
The Effect Of Neutron Irradiation On The Properties Of Tl_{0.6}Pb_{0.3}Cd_{0.1}Ba_2ca_2cu_{3}O_{9-Delta} Superconductors, Kareem Ali Jasim, Tariq Jaffar Alwan, Khalid Hadi Mahdi, Hazim Louis Mansour
Turkish Journal of Physics
The effect of neutron irradiation on phase purity, crystal structure, and electrical resistivity of Tl_{0.6}Pb_{0.3}Cd_{0.1} Ba_2Ca_2Cu_3O_{9-delta} superconductors has been studied before and after irradiation by electrical resistance measurements and X-ray diffraction techniques. The zero-resistance superconducting transition temperature, T_{c(offset)}, of samples systematically decreases by about 5 K with the increase of neutron irradiation fluence up 18.12 \times 10^{10} n cm^{-2}. The crystalline phases showed that the compounds have 2 phases, a high-Tc phase (1223) and low-Tc phase (1212), in addition to the impurity phase. The irradiation led to a decrease in oxygen content and volume fraction of high-Tc phase (1223).
Best Possible Tilt Angle For Optimal Solar Radiation On An Inclined Surface For Photovoltaic And Solar Thermal Application In Yenagoa, Nigeria, Kenneth Priye Ainah, John Tarilanyo Afa
Best Possible Tilt Angle For Optimal Solar Radiation On An Inclined Surface For Photovoltaic And Solar Thermal Application In Yenagoa, Nigeria, Kenneth Priye Ainah, John Tarilanyo Afa
Turkish Journal of Physics
Due to the increased use of solar energy resources globally, the study of the available solar resources is essential for systems that use solar energy. This paper uses the Duffie and Beckhman method for estimating the best possible tilt angle for solar radiation using some climatic data such as declination, latitude, and clear index for photovoltaic and solar thermal systems application in the city of Yenagoa. This research was conducted with different tilt angle ranging from 15° to 65° tilt and it was shown that the best tilt angle for solar energy system application for Yenagoa falls in the range …
Exact Traveling Wave Solutions Of The Perturbed Klein--Gordon Equation With Quadratic Nonlinearity In (1+1)-Dimension, Part I: Without Local Inductance And Dissipation Effect, Zai-Yun Zhang
Turkish Journal of Physics
In this paper, the auxiliary ordinary differential equation is employed to solve the perturbed Klein-Gordon equation with quadratic nonlinearity in the (1+1)-dimension without local inductance and dissipation effect. By using this method, we obtain abundant new types of exact traveling wave solutions.
Defect Studies In Strain-Relaxed Si_{1-X}Ge_X Alloys, Şeref Kalem
Defect Studies In Strain-Relaxed Si_{1-X}Ge_X Alloys, Şeref Kalem
Turkish Journal of Physics
Raman light scattering, low-temperature photoluminescence, light-scattering tomography, and hydrogenation were used to investigate optical properties of defects in strain-relaxed Si_{1-x}Ge_x (0.05 \le x \le 0.50) alloys. The photoluminescence emission was characterized by typical zero-phonon, phonon-assisted, and dislocations-related emissions, which are dependent on Ge composition x. However, luminescence spectra exhibited above band-gap features, which are likely associated with the presence of Si-rich regions in the alloys. The results are correlated with light-scattering tomography, revealing the presence of dislocations and Si precipitates. The excess peak at 519 cm^{-1} in Ge-rich samples is supportive of this observation. At low Ge content, a dislocation-related …