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Articles 7681 - 7710 of 10319
Full-Text Articles in Physical Sciences and Mathematics
General Formulation Of The Scattered Matter Waves By A Quantum Shutter, Yusuf Zi̇ya Umul
General Formulation Of The Scattered Matter Waves By A Quantum Shutter, Yusuf Zi̇ya Umul
Turkish Journal of Physics
The scattering process of matter waves by a quantum shutter is investigated by using the spectrum integral representation. The scattered fields are expressed in terms of the Fresnel function. It is shown that the obtained equation gives the Moshinsky function for a one dimensional problem of the plane wave. Also a general integral representation is derived for two dimensional problems. The scattering of matter waves for some special wave-packets are examined analytically and numerically.
Energy Levels Of The 6p_{3/2}Ns, Nd, Ng Autoionizing Series Of Pb I, Chao Zhou, Liang Liang, Ling Zhang
Energy Levels Of The 6p_{3/2}Ns, Nd, Ng Autoionizing Series Of Pb I, Chao Zhou, Liang Liang, Ling Zhang
Turkish Journal of Physics
Based on the weakest bound electron potential model (WBEPM) theory, six energy levels of the autoionizing Rydberg series 6pns 3/2[3/2]_1 (n = 15-25), 6pns 3/2[3/2]_2 (n = 15-25), 6pnd 3/2[3/2]_1 (n = 13-25), 6pnd 3/2[5/2]_3 (n = 13-25), 6pnd 3/2[7/2]_3 (n = 14-25) and 6png 3/2[5/2]_2 (n = 5-25) of Pb I are calculated. Foreign level perturbation corrections are taken into account in calculations of four series among them. The theoretical calculated results are in good agreement with the known experimental data, and some energies without experimental values are predicted.
Effective Annealing Of Zno Thin Films Grown By Electrochemical Deposition Technique, Cevdet Coşkun, Harun Güney, Emre Gür, Sebahatti̇n Tüzemen
Effective Annealing Of Zno Thin Films Grown By Electrochemical Deposition Technique, Cevdet Coşkun, Harun Güney, Emre Gür, Sebahatti̇n Tüzemen
Turkish Journal of Physics
Wide and direct band gap ZnO thin films have been grown on conductive indium-tin-oxide (ITO) substrates by electrochemical deposition (ECD) technique using different growth parameters. High quality films in terms of crystallographic and optical characteristics have been obtained under a cathodic potential of -0.9 V; a pH of 5.2, using 0.1 M Zn(NO_3)_2 solution. Oxygen gas flow through the solution increased the growth rate and the quality of samples. Subsequent heat treatments at various temperatures for 30 minutes under dry N_2 gas flow show that the most suitable annealing temperature is 300 °C for these electrochemically deposited thin films on …
Combined Analysis Of Solar Neutrino Data Within The Rsfp Framework Together With New Kamland Data, Deni̇z Yilmaz
Combined Analysis Of Solar Neutrino Data Within The Rsfp Framework Together With New Kamland Data, Deni̇z Yilmaz
Turkish Journal of Physics
A combined analysis of solar neutrino data together with the new KamLAND data is presented in the RSFP framework. It is investigated how the allowed regions are effected from the new KamLAND data at different \mu B values. Limits on \mu B value is found at the different confidence level intervals.
Production Of Ybco Superconductor Sample By Powder-In-Tube Method (Pitm); And Effect Of Cd And Ga Doping On The System, Serkan Alagöz
Production Of Ybco Superconductor Sample By Powder-In-Tube Method (Pitm); And Effect Of Cd And Ga Doping On The System, Serkan Alagöz
Turkish Journal of Physics
In this study, YBa_2Cu_3O_{7-\delta} and Y_{0.5}X_{0.5}Ba_2Cu_3O_{7-\delta} (x = Ga, Cd) compounds are produced by Powder-In-Tube Method and electrical and physical characteristics of those samples were investigated. Following 3, 5 and 9 tons pressure applied to three sample groups (YBa_2Cu_3O_{7-\delta}, Y_{0.5}Cd_{0.5}Ba_2Cu_3O_{7-\delta}, Y_{0.5}Ga_{0.5}Ba_2Cu_3O_{7-\delta}), samples were examined via X-Ray diffraction, resistivity and SEM measurement. Considerable changes in Crystallographic properties of the YBCO samples, produced by using Powder-In-Tube Method for different pressure values, were observed. Under different magnetic fields conditions, resistance of the YBCO samples was measured and it was seen that samples had very pure and homogenous structure. Ga doping into YBCO composition …
Asphericity In The Fermi Surface Of D And F-Shell Metals, J. K. Baria, A. R. Jani
Asphericity In The Fermi Surface Of D And F-Shell Metals, J. K. Baria, A. R. Jani
Turkish Journal of Physics
Recently proposed pseudopotential has been used to calculate asphericity in the Fermi surface of d and f-shell metals along the three symmetry directions [100], [110] and [111]. The parameter of the potential has been determined by zero pressure condition and the exchange and correlation function due to Taylor has been incorporated. The present results are in good agreement with experimental findings for Cu, Ag, Au and Pd; while for other d and f- shell metals we could not found sufficient theoretical as well as experimental data for the asphericity in the Fermi Surface in order to workout a quantitative comparison. …
Electrical Characterization And Relaxation Behavior Of Lithium-Indium-Phosphate Glasses Via Impedance Spectroscopy, M. V. N. V. D. Sharma, A. V. Sarma, R. Balaji Rao
Electrical Characterization And Relaxation Behavior Of Lithium-Indium-Phosphate Glasses Via Impedance Spectroscopy, M. V. N. V. D. Sharma, A. V. Sarma, R. Balaji Rao
Turkish Journal of Physics
Phosphate glasses with various compositions of lithium oxide and indium oxide were synthesized by melt quenching technique. The glass forming ability parameter K_{gl} was characterized by differential thermal analysis. The electrical measurements for all the glass samples were carried out in the frequency range of 10 Hz to 10^{6} Hz and at a temperature range of 393-513 K by the Impedance spectroscopy. Frequency dependent conductivity follows the power law. The ac conductivity increases with temperature following the Arrhenius law. Master curve in the scaling analysis suggesting the temperature independent conduction relaxation mechanism.
Generation Of Ultrafast Bright And Dark Pulse On Silicon Chip With Integrated Mach-Zehnder Interferometer Configuration, Jianwei Wu, Fengguang Luo
Generation Of Ultrafast Bright And Dark Pulse On Silicon Chip With Integrated Mach-Zehnder Interferometer Configuration, Jianwei Wu, Fengguang Luo
Turkish Journal of Physics
In this paper we propose and simulate ultrafast femtosecond bright and dark pulses, obtained simultaneously at the same center wavelength, based on silicon-on-insulator (SOI) waveguides in Mach-Zehnder interferometer (MZI) configuration; the ultrafast pulsed pump is injected into one MZI's arm and a continuous wave component (CW) is divided equally into the two MZI arms. Numerical results show that properties of the generated bright and dark pulses are strongly dependent on the launching optical powers of both the pump pulse and CW carriers, and on the waveguide length.
Unsteady Free Convection Flow With Thermal Radiation Past A Vertical Porous Plate With Newtonian Heating, Promise Mebine, Emmanuel Munakurogha Adigio
Unsteady Free Convection Flow With Thermal Radiation Past A Vertical Porous Plate With Newtonian Heating, Promise Mebine, Emmanuel Munakurogha Adigio
Turkish Journal of Physics
This paper considers exact solutions of unsteady free convection flow with thermal radiation past a vertical porous plate with Newtonian heating. The technique of Laplace transform was employed in deriving the solutions to the governing flow and energy equations. A parametric study of all parameters involved was conducted, and a representative set of results showing the effect of the radiation parameter N, the ratio of uniform suction to characteristic velocity parameter R, and the free convection parameter Gr on the velocity and temperature are illustrated graphically. The skin friction or shear and heat flux are discussed quantitatively. It is evident …
Composition Dependent Of Dielectric Properties In Se_{100-X}Pb_X Glassy Alloys, Jyoti Sharma, Santosh Kumar
Composition Dependent Of Dielectric Properties In Se_{100-X}Pb_X Glassy Alloys, Jyoti Sharma, Santosh Kumar
Turkish Journal of Physics
In this paper we report the composition dependent of dielectric properties in Se_{100-x}Pb_x (x = 0, 2, 4, 6 and 10) glassy alloys. The temperature and frequency dependence of the dielectric constants and the dielectric losses in the above glassy systems in the frequency range 1 kHz-5 MHz and temperature range 300-340 K have been measured. It has been found that dielectric constant and the dielectric loss both are highly dependent on frequency and temperature and also found to be increased with increasing concentration of Pb in pure amorphous Se. The results have been interpreted in terms of increase in …
The Electrical Conduction Mechanisms And Thermoelectric Power Of Snse Single Crystals, M. M. Nassary
The Electrical Conduction Mechanisms And Thermoelectric Power Of Snse Single Crystals, M. M. Nassary
Turkish Journal of Physics
Single crystals of SnSe were prepared in our laboratory by a special modified Bridgman technique. Measurements of the electrical conductivity and Hall effect between 141 K and 553 K were carried out on SnSe sample in two crystallographic directions. The investigated sample was found to be of p-type conductivity. The Hall mobilities parallel and perpendicular to layers plane at room temperature, were 7835.9 cm^2/ V \cdots and 7274.7 cm^2/ V.s, respectively. The free carrier concentration P = 3.52 \times 10^{12} cm^{-3} at room temperature. Also, the thermoelectric power (TEP) was investigated in the temperature range from 176 to 553 K. …
Growth And Microindentation Analysis Of Pure And Doped Sb_2se_3 Crystals, K. A. Chandrasekharan, A. G. Kunjomana
Growth And Microindentation Analysis Of Pure And Doped Sb_2se_3 Crystals, K. A. Chandrasekharan, A. G. Kunjomana
Turkish Journal of Physics
Pure and doped antimony selenide (Sb_2Se_3, Sb_2Se_{2.8}Te_{0.2}, and Sb_2Se_{2.6}Te_{0.4}) crystals have been grown from melt by the Bridgman Stockbarger method. X-ray powder diffraction analysis was carried out to determine the lattice parameters of the grown samples. The morphology of cleavage planes was observed using SEM. Energy dispersive analysis by X-rays (EDAX) was done to find out the chemical composition of the grown samples. Correlation of microhardness with other mechanical characteristics such as toughness, brittleness, and yield strength, has been investigated. The effects of Te doping on the mechanical behaviour and energy gap were also studied on the cleavage faces.
Thermoelectric Power And Low-Field Electron Mobility In Al_Xga_{1-X}N Lattice-Matched To Gan, H. Arabshahi
Thermoelectric Power And Low-Field Electron Mobility In Al_Xga_{1-X}N Lattice-Matched To Gan, H. Arabshahi
Turkish Journal of Physics
The results of thermoelectric power and electron drift mobility in Al_xGa_{1-x}N lattice-matched to GaN are calculated for different temperatures, free-electron concentrations and compositions. The two-mode nature of the polar optic phonons is considered jointly with deformation potential acoustic, piezoelectric, alloy and ionized-impurity scattering. Band non-parabolicity, admixture of p functions, arbitrary degeneracy of the electron distribution and the screening effects of free carriers on the scattering probabilities are incorporated. The Boltzmann equation is solved by an iterative technique using the currently established values of the material parameters. The iterative results are in fair agreement with other recent calculations obtained using the …
Study Of Second-Class Currents Effects On Polarization Characteristics In Quasi-Elastic Neutrino (Anti-Neutrino) Scattering By Nuclei, Adamou Ousmane Manga, Almoustapha Aboubacar
Study Of Second-Class Currents Effects On Polarization Characteristics In Quasi-Elastic Neutrino (Anti-Neutrino) Scattering By Nuclei, Adamou Ousmane Manga, Almoustapha Aboubacar
Turkish Journal of Physics
The differential cross section of quasi-elastic neutrino scattering by nuclei is computed. The numerical analysis of energy dependence of the spin asymmetry, the angular electron-neutrino (e\nu) correlation and the charge asymmetry coefficients shows that the relative contribution of the second-class current (SCC) tensor form factor can reach some tens of percents in the case of particular values of final nuclei alignment and polarization.
Behavior Of Transition Amplitude And Evolution Of The Energy Of Quantum Kicked Rotator, Abdolrasoul Gharaati
Behavior Of Transition Amplitude And Evolution Of The Energy Of Quantum Kicked Rotator, Abdolrasoul Gharaati
Turkish Journal of Physics
I give certain analytical properties of quantum kicked rotators, both theoretic and observed from computation. I give an expression for the wave function between two successive impulses. An element of the transition matrix, the matrix that takes the wave function from one impulse to another, exponentially falls away from the main diagonal. The decay parameter is given for a few special cases of a periodic potential. Finally, the transition matrix is used to derive the time evolution of the energy for periodic cases and for fundamental resonances. The empirical expressions of Dorizzi et al. are compatible with our analytical results.
Vibrational Analysis Of Flavone, Yusuf Erdoğdu, Ozan Ünsalan, M. Tahi̇r Güllüoğlu
Vibrational Analysis Of Flavone, Yusuf Erdoğdu, Ozan Ünsalan, M. Tahi̇r Güllüoğlu
Turkish Journal of Physics
In this study, the experimental and theoretical study on the structures and vibrations of flavone are presented. FT-IR and FT-Raman spectra of the molecule have been recorded in the 400-4000 cm^{-1} region and the 5-3500 cm^{-1} region, respectively. The molecular geometry and vibrational frequencies of flavone in the ground state have been calculated by using Density Functional method (B3LYP) in conjunction with 6-311++G(d,p) and 6-31++G(d) as basis sets.
Heavy Ion Reactions Producing A Heavier Deformed Nucleus And Free Nucleons, Ahmed Osman
Heavy Ion Reactions Producing A Heavier Deformed Nucleus And Free Nucleons, Ahmed Osman
Turkish Journal of Physics
Carbon induced heavy ion reactions on the heavy ^{197}Au target are considered. The statistical scission model is used to calculate this fission process. In the present considered reactions, the process leads to the fragmentation of only one deformed heavy fragment and few nucleons. Angular distributions of the fission fragments are numerically calculated for different values of the incident energies in the range 64-104 MeV. The present theoretical calculations of the differential cross-sections are in good agreements with experimental data for the carbon incident energy 84 A MeV. The effective variance of this fission process is also calculated. The present numerically …
Cd_{1-X}Mn_Xs Dilute Magnetic Semiconductor: Application In Photoelectrochemical Cells, J. S. Dargad, L. P. Deshmukh
Cd_{1-X}Mn_Xs Dilute Magnetic Semiconductor: Application In Photoelectrochemical Cells, J. S. Dargad, L. P. Deshmukh
Turkish Journal of Physics
A new class of dilute magnetic semiconductor (DMS, CdMnS) thin film based photoelectrochemical cell is presented. DMS thin films are synthesized on both glass and stainless steel substrates using a chemical growth process. The preparation parameters, such as growth temperature, time, reaction pH, precursor concentrations, etc., were optimized to yield characteristically oriented films. The layer thickness was found to decrease with increase in Mn^{2+} concentration. Composition of the as-grown samples was determined by an EDS technique. The electrochemical cells were then formed out of these series of films as the active photoelectrodes, an electrolyte and a counter electrode. The cells …
Stack-Sortable Permutations And Polynomials, İsmai̇l Ş. Güloğlu, Cemal Koç
Stack-Sortable Permutations And Polynomials, İsmai̇l Ş. Güloğlu, Cemal Koç
Turkish Journal of Mathematics
The Catalan numbers show up in a diverse variety of counting problems. In this note we give yet another characterization of the Catalan number C(n). It is characterized as the dimension of a certain space of multilinear polynomials by exhibiting a basis.
Lebesgue-Stieltjes Measure On Time Scales, Asli Deni̇z, Ünal Ufuktepe
Lebesgue-Stieltjes Measure On Time Scales, Asli Deni̇z, Ünal Ufuktepe
Turkish Journal of Mathematics
The theory of time scales was introduced by Stefan Hilger in his Ph. D. thesis in 1988, supervised by Bernd Auldbach, in order to unify continuous and discrete analysis [5]. Measure theory on time scales was first constructed by Guseinov [4], then further studies were made by Guseinov-Bohner [1], Cabada-Vivero [2] and Rzezuchowski [6]. In this article, we adapt the concept of Lebesgue-Stieltjes measure to time scales. We define Lebesgue-Stieltjes \Delta and \nabla-measures and by using these measures, we define an integral adapted to time scales, specifically Lebesgue-Stieltjes \Delta-integral. We also establish the relation between Lebesgue-Stieltjes measure and Lebesgue-Stieltjes \Delta-measure, …
Korovkin Type Error Estimates For Positive Linear Operators Involving Some Special Functions, Ogün Doğru, Esra Erkuş-Duman
Korovkin Type Error Estimates For Positive Linear Operators Involving Some Special Functions, Ogün Doğru, Esra Erkuş-Duman
Turkish Journal of Mathematics
In the present paper, we introduce a new sequence of linear positive operators with the help of generating functions. We obtain some Korovkin type approximation properties for these operators and compute rates of convergence by means of the first and second order modulus of continuities and Peetre´s K-functional. In order to obtain explicit expressions for the first and second moment of our operators, we obtain a functional differential equation including our operators. Furthermore, we deal with a modification of our operators converging to integral of function f on the interval (0,1).
Cartan Calculus On The Quantum Space R_Q^3, Sali̇h Çeli̇k, E. Mehmet Özkan, Ergün Yaşar
Cartan Calculus On The Quantum Space R_Q^3, Sali̇h Çeli̇k, E. Mehmet Özkan, Ergün Yaşar
Turkish Journal of Mathematics
To give a Cartan calculus on the extended quantum 3d space, the noncommutative differential calculus on the extended quantum 3d space is extended by introducing inner derivations and Lie derivatives.
On \Tau-Lifting Modules And \Tau-Semiperfect Modules, Mustafa Alkan
On \Tau-Lifting Modules And \Tau-Semiperfect Modules, Mustafa Alkan
Turkish Journal of Mathematics
Motivated by [1], we study on \tau-lifting modules (rings) and \tau-semiperfect modules (rings) for a preradical \tau and give some equivalent conditions. We prove that; i) if M is a projective \tau-lifting module with \tau(M) \subseteq \delta(M), then M has the finite exchange property; ii) if R is a left hereditary ring and \tau is a left exact preradical, then every \tau-semiperfect module is \tau--lifting; iii) R is \tau-lifting if and only if every finitely generated free module is \tau-lifting if and only if every finitely generated projective module is \tau-lifting; iv) if \tau (R) \subseteq \delta (R), then R …
Some Inequalities Concerning The Rate Of Growth Of Polynomials, Abdullah Mir, K. K. Dewan, Naresh Singh
Some Inequalities Concerning The Rate Of Growth Of Polynomials, Abdullah Mir, K. K. Dewan, Naresh Singh
Turkish Journal of Mathematics
In this paper we consider a class of polynomials p(z)=a_0+\suml_{v=t}^n a_vz^v, t\ge1, not vanishing in z
Approximation By Certain Linear Operators Preserving X^2, Lucyna Rempulska, Karolina Tomczak
Approximation By Certain Linear Operators Preserving X^2, Lucyna Rempulska, Karolina Tomczak
Turkish Journal of Mathematics
We investigate certain positive linear operators L_n preserving the functions e_k (x)=x^k, k=0, 1, and modified operators L_n^* which preserve e_0 and e_2. We show that the error of approximation of f by L_n^* (f) is smaller than for L_n(f).
On \Phi-Recurrent Kenmotsu Manifolds, Uday Chand De, Ahmet Yildiz, Funda Yaliniz
On \Phi-Recurrent Kenmotsu Manifolds, Uday Chand De, Ahmet Yildiz, Funda Yaliniz
Turkish Journal of Mathematics
The object of this paper is to study \phi-recurrent Kenmotsu manifolds. Also three-dimensional locally \phi-recurrent Kenmotsu manifolds have been considered. Among others it is proved that a locally \phi-recurrent Kenmotsu spacetime is the Robertson-Walker spacetime. Finally we give a concrete example of a three-dimensional Kenmotsu manifold.
A New Approach On Constant Angle Surfaces In E^3, Marian Ioan Munteanu, Ana Irina Nistor
A New Approach On Constant Angle Surfaces In E^3, Marian Ioan Munteanu, Ana Irina Nistor
Turkish Journal of Mathematics
In this paper we study constant angle surfaces in Euclidean 3--space. Even that the result is a consequence of some classical results involving the Gauss map (of the surface), we give another approach to classify all surfaces for which the unit normal makes a constant angle with a fixed direction.
Applications Of The Golden Ratio On Riemannian Manifolds, Cristina-Elena Hretcanu, Mircea Craşmareanu
Applications Of The Golden Ratio On Riemannian Manifolds, Cristina-Elena Hretcanu, Mircea Craşmareanu
Turkish Journal of Mathematics
The Golden Ratio is a fascinating topic that continually generates new ideas. The main purpose of the present paper is to point out and find some applications of the Golden Ratio and of Fibonacci numbers in Differential Geometry. We study a structure defined on a class of Riemannian manifolds, called by us a Golden Structure. A Riemannian manifold endowed with a Golden Structure will be called a Golden Riemannian manifold. Precisely, we say that an (1,1)-tensor field \widetilde{P} on a m-dimensional Riemannian manifold (\widetilde{M}, \widetilde{g}) is a Golden Structure if it satisfies the equation \widetilde{P}^{2}=\widetilde{P}+I (which is similar to that …
Criteria Of Nilpotency And Influence Of Contranormal Subgroups On The Structure Of Infinite Groups, Leonid Andreevich Kurdachenko, Javier Otal, Igor Yakov Subbotin
Criteria Of Nilpotency And Influence Of Contranormal Subgroups On The Structure Of Infinite Groups, Leonid Andreevich Kurdachenko, Javier Otal, Igor Yakov Subbotin
Turkish Journal of Mathematics
Following J.S. Rose, a subgroup H of a group G is called contranormal if G=H^G. In a certain sense, contranormal subgroups are antipodes to subnormal subgroups. It is well known that a finite group is nilpotent if and only if it has no proper contranormal subgroups. However, for infinite groups this criterion is not valid. There are examples of non-nilpotent infinite groups whose subgroups are subnormal; in particular, these groups have no contranormal subgroups. Nevertheless, for some classes of infinite groups, the absence of contranormal subgroups implies nilpotency of the group. The present article is devoted to the search of …
A Note On The Lévy Constant For Continued Fractions, Ting Zhong
A Note On The Lévy Constant For Continued Fractions, Ting Zhong
Turkish Journal of Mathematics
In this note, we study the lévy constant of continued fraction expansions. We show that for all x \in [0,1), the upper lévy constant of x is finite except a set with Hausdorff dimension one-half.