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Articles 7981 - 8010 of 10319
Full-Text Articles in Physical Sciences and Mathematics
Physical Properties Of (Li_2o)_{0.40}(Fe_2o_3)_{0.05-X}(P_2o_5)_{0.55}: (Ag_2o)_X Glasses, K. Sambasiva Rao, N. Krishna Mohan, Nalluri Veeraiah
Physical Properties Of (Li_2o)_{0.40}(Fe_2o_3)_{0.05-X}(P_2o_5)_{0.55}: (Ag_2o)_X Glasses, K. Sambasiva Rao, N. Krishna Mohan, Nalluri Veeraiah
Turkish Journal of Physics
Li_2O-Fe_2O_3-P_2O_5 glasses containing small concentrations of Ag_2O from 0 to 2 mol% were prepared. Samples are characterized by X-ray diffraction and scanning electron microscope techniques. A number of studies viz., chemical durability, dielectric studies (constant \varepsilon', loss tan \delta, a.c. conductivity \sigma_{ac} over a range of frequency and temperature), spectroscopic (infrared, optical absorption ESR spectra) and magnetic susceptibility studies of these glasses, have been carried out. The interesting variations observed in all these properties with the concentration of Ag^{+} ions have been analyzed in the light of different oxidation states and environment of iron ions in the glass network.
Bianchi Type Vi_1 Viscous Fluid Cosmological Model In Wesson´S Theory Of Gravitation, G. S. Khadekar, G. R. Avachar
Bianchi Type Vi_1 Viscous Fluid Cosmological Model In Wesson´S Theory Of Gravitation, G. S. Khadekar, G. R. Avachar
Turkish Journal of Physics
Field equations of a scale invariant theory of gravitation proposed by Wesson [1, 2] are obtained in the presence of viscous fluid with the aid of Bianchi type VI_h space-time with the time dependent gauge function (Dirac gauge). It is found that Bianchi type VI_h (h = 1) space-time with viscous fluid is feasible in this theory, whereas Bianchi type VI_h (h = -1, 0) space-times are not feasible in this theory, even in the presence of viscosity. For the feasible case, by assuming a relation connecting viscosity and metric coefficient, we have obtained a nonsingular-radiating model. We have discussed …
The Fluctuation Theory And Gravitational Galaxy Clustering, Sajad Masood, Shakeel A. Simnani, Manzoor A. Malik
The Fluctuation Theory And Gravitational Galaxy Clustering, Sajad Masood, Shakeel A. Simnani, Manzoor A. Malik
Turkish Journal of Physics
The description of gravitational galaxy clustering evolving through quasi-equilibrium thermodynamics is examined on the basis of thermodynamic fluctuations and statistical mechanical ensemble techniques. Second order fluctuation moments lead to an ordinary differential equation for b(nT^{-3}), ratio of gravitational correlation energy to (twice) the kinetic energy of peculiar velocities. The general solution of the differential equation gives a functional form of b in terms of a scale invariant function nT^{-3}, in conformity with the earlier results. A method for finding analytic expression for probability distribution function f(N) of gravitational clustering in a expanding universe is also developed on the basis of …
Variation Principle For A Linear Potential, J. I. Casaubon, J. P. Cosentino, Adrian H. Buep
Variation Principle For A Linear Potential, J. I. Casaubon, J. P. Cosentino, Adrian H. Buep
Turkish Journal of Physics
We introduce the student to the Quantum Mechanic linear potential (constant force) using new variation wave functions for the ground state and the first excited one. This approach use simple wave functions to describe the exact Airy solution.
Optical Properties And Structural Characterizations Of Sb_2s_3 Thin Films Deposited By Chemical Bath Deposition Technique, F. I. Ezema, A. B. C. Ekwealor, P. U. Asogwa, P. E. Ugwuoke, C. Chigbo, R. U. Osuji
Optical Properties And Structural Characterizations Of Sb_2s_3 Thin Films Deposited By Chemical Bath Deposition Technique, F. I. Ezema, A. B. C. Ekwealor, P. U. Asogwa, P. E. Ugwuoke, C. Chigbo, R. U. Osuji
Turkish Journal of Physics
Thin films of Sb_2S_3 were deposited on glass substrates at 300 K by chemical bath deposition (CBD) technique and annealed at various temperatures. The absorption coefficient \alpha was determined using the absorbance and transmission measurements from a Unico UV-2102 PC spectrophotometer, at normal incidence of light in the wavelength range 200--1000 nm, and the structural characterization were done using XRD and photomicrograph. The films have high absorption, greater than 90%, in the UV region but with moderate transmittance of greater than 50% for as-deposited, and poor transmittance of less than 45% for the annealed throughout the entire spectrum. Plots of …
A Single Junction Barrier Model For Varistors, Mustapha Tioursi, Abdallah Chaouch
A Single Junction Barrier Model For Varistors, Mustapha Tioursi, Abdallah Chaouch
Turkish Journal of Physics
In this paper, we propose a simplified model that explains the experimental behaviour of the single junction barrier height in varistors. The equation obtained for the barrier height variation versus voltage contains all parameters that characterize the grain boundary and has no adjustable parameters. It allows us to describe the equilibrium state for each voltage level. From this model, it is concluded that the threshold voltage and the nonlinearity coefficient for a single junction barrier are strongly related to the unoccupied traps level at zero bias, when the barrier height at zero bias and the leakage current are related to …
Magnetic Levitation Of A Small Magnetic Ring Above Cylindrical Superconductor Sample In The Meissner State, H. M. Al-Khateeb, F. Y. Alzoubi, M. K. Alqadi, N. Y. Ayoub
Magnetic Levitation Of A Small Magnetic Ring Above Cylindrical Superconductor Sample In The Meissner State, H. M. Al-Khateeb, F. Y. Alzoubi, M. K. Alqadi, N. Y. Ayoub
Turkish Journal of Physics
The levitation force between a cylindrical superconductor in the Meissner state and a small magnetic ring was calculated using the dipole-dipole interaction model under the assumption that the magnetic ring is small compared with the physical dimensions of the system. We obtained analytical expressions for the levitation forces as a function of the geometrical parameters of the ring and the superconductor sample as well as the height of magnetic ring. We analyzed the levitation force in two configurations of the magnetic moment of the small ring with respect to the surface of the superconductor: one horizontal in which the magnetic …
Nature, Provenance And Relationships Of Early Miocene Palaeovalley Fills, Northern Adana Basin, Turkey: Their Significance For Sediment-Bypassing On A Carbonate Shelf, A. Sami̇ Derman, Kemal Gürbüz
Nature, Provenance And Relationships Of Early Miocene Palaeovalley Fills, Northern Adana Basin, Turkey: Their Significance For Sediment-Bypassing On A Carbonate Shelf, A. Sami̇ Derman, Kemal Gürbüz
Turkish Journal of Earth Sciences
The Gildirli Formation is the oldest Neogene rock unit in the Adana Basin and was formed prior to the regionally extensive Early Miocene marine transgression. These coarse clastic red-beds provide important evidence about the causes and early phases of filling in this large trough, because the Gildirli Formation sediments fill an irregular palaeotopography carved out of Palaeozoic and Mesozoic basement rocks. Detailed study of the Gildirli Formation reveals the existence of at least two alluvial fans supplied from different source areas. A northeastern fan, exposed around Gildirli Village, was fed by streams draining an area of ophiolitic mélange, Mesozoic and …
Spectral Problems For Operator Pencils In Non-Separated Root Zones, Mahi̇r Hasanov
Spectral Problems For Operator Pencils In Non-Separated Root Zones, Mahi̇r Hasanov
Turkish Journal of Mathematics
Variational principles for real eigenvalues of self-adjoint operator pencils in non-separated root zones are studied.
On Dimension Of Modules, S. Karimzadeh, Reza Nekooei
On Dimension Of Modules, S. Karimzadeh, Reza Nekooei
Turkish Journal of Mathematics
In this paper we prove the lying over and going down theorems for modules. Finally, we apply the above theorems and prove some results on the dimension of a module and its submodule.
Some Curvature Tensors On A Trans-Sasakian Manifold, C. S. Bagewadi, --- Venkatesha
Some Curvature Tensors On A Trans-Sasakian Manifold, C. S. Bagewadi, --- Venkatesha
Turkish Journal of Mathematics
The object of the present paper is to study the geometry of trans-Sasakian manifold when it is projectively semi-symmetric, Weyl semi-symmetric and concircularly semi-symmetric.
Lightlike Hypersurfaces Of Semi-Euclidean Spaces Satisfying Curvature Conditions Of Semisymmetry Type, Bayram Şahi̇n
Lightlike Hypersurfaces Of Semi-Euclidean Spaces Satisfying Curvature Conditions Of Semisymmetry Type, Bayram Şahi̇n
Turkish Journal of Mathematics
In this paper, we investigate lightlike hypersurfaces which are semi-symmetric, Ricci semi-symmetric, parallel or semi-parallel in a semi-Euclidean space. We obtain that every screen conformal lightlike hypersurface of the Minkowski spacetime is semi-symmetric. For higher dimensions, we show that the semi-symmetry condition of a screen conformal lightlike hypersurface reduces to the semi-symmetry condition of a leaf of its screen distribution. We also obtain that semi-symmetric and Ricci semi-symmetric lightlike hypersurfaces are totally geodesic under certain conditions. Moreover, we show that there exist no non-totally geodesic parallel hypersurfaces in a Lorentzian space.
On P-Sasakian Manifolds Satisfying Certain Conditions On The Concircular Curvature Tensor, Ci̇han Özgür, Mukut Mani Tripathi
On P-Sasakian Manifolds Satisfying Certain Conditions On The Concircular Curvature Tensor, Ci̇han Özgür, Mukut Mani Tripathi
Turkish Journal of Mathematics
We classify P-Sasakian manifolds, which satisfy the conditions Z(\xi ,X) · Z = 0, Z(\xi ,X) · R = 0, R(\xi ,X) · Z = 0, Z(\xi ,X) · S = 0 and Z(\xi ,X) · C = 0.
Rayleigh Number In A Stability Problem For A Micropolar Fluid, Ioana Florica Dragomirescu
Rayleigh Number In A Stability Problem For A Micropolar Fluid, Ioana Florica Dragomirescu
Turkish Journal of Mathematics
Approximate numerical evaluations of the Rayleigh number are obtained for a stability problem of thermal convection in a heat-conducting micropolar fluid layer between two rigid boundaries [7]. The influences of all the physical parameters on the values of the Rayleigh number are studied. Also, approximate neutral curves and neutral surfaces are represented in various parameters spaces.
Extreme Points Of Certain Subsets Of Hermitian Elements In Banach Algebras, Gerd Herzog, Christoph Schmoeger
Extreme Points Of Certain Subsets Of Hermitian Elements In Banach Algebras, Gerd Herzog, Christoph Schmoeger
Turkish Journal of Mathematics
We consider the real Banach spaces H(A) of all hermitian elements of a complex Banach algebra A. We prove that if an even power of a \in N(A) is hermitian, then a is an extreme point of the unit ball of H(A) if and only if a^2 = 1. Moreover, if an odd power of a \in H(A) is hermitian and a is an extreme point of the unit ball of H(A), then a^3 = a.
Higher Order Generalization Of Positive Linear Operators Defined By A Class Of Borel Measures, Oktay Duman
Higher Order Generalization Of Positive Linear Operators Defined By A Class Of Borel Measures, Oktay Duman
Turkish Journal of Mathematics
In the present paper, we introduce a sequence of linear operators, which is a higher order generalization of positive linear operators defined by a class of Borel measures studied in [2]. Then, using the concept of A-statistical convergence we obtain some approximation results which are stronger than the aspects of the classical approximation theory.
Closure Of Minimal Extensions, M. El Hajoui, A. Miri
Closure Of Minimal Extensions, M. El Hajoui, A. Miri
Turkish Journal of Mathematics
Let R be a commutative ring with a unit and M an R-module. In this paper we give a comparison between the F-closure in M of an R-submodule having a minimal extension and the closure of this minimal extension for the same Gabriel topology defined on the ring R. If J(R) \in F we prove that both closures are the same. Moreover, if R is Artinian or semi-simple then the converse also holds.
The Generalized Hyers--Ulam--Rassias Stability Of A Cubic Functional Equation, Abbas Najati
The Generalized Hyers--Ulam--Rassias Stability Of A Cubic Functional Equation, Abbas Najati
Turkish Journal of Mathematics
In this paper, we obtain the general solution and the generalized Hyers--Ulam--Rassias stability for a cubic functional equation f(mx+y)+f(mx-y)=mf(x+y)+mf(x-y)+2(m^3-m)f(x) for a positive integer m \geq 1.
Locally Finite Simple Moufang Loops, J. I. Hall
Locally Finite Simple Moufang Loops, J. I. Hall
Turkish Journal of Mathematics
A Moufang loop is a binary system that satisfies a particular weak form of the associative law. Doro and Glauberman observed that there is a direct connection between simple Moufang loops and simple groups with triality. Using this correspondence, Liebeck proved that nonassociative finite simple Moufang loops arise from split octonion algebras over finite fields. We extend Liebeck's theorem to the case of locally finite simple Moufang loops.
Lengths Of Subsets In Coxeter Groups, Sarah B. Hart, Peter J. Rowley
Lengths Of Subsets In Coxeter Groups, Sarah B. Hart, Peter J. Rowley
Turkish Journal of Mathematics
No abstract provided.
Barely Transitive Groups, Mahmut Kuzucuoğlu
Barely Transitive Groups, Mahmut Kuzucuoğlu
Turkish Journal of Mathematics
This is a survey article on barely transitive groups. It also involves some recent results in the case of a non-locally finite barely transitive group.
A Non-Linear Locally Finite Simple Group With A P-Group As Centralizer, U. Meierfrankenfeld
A Non-Linear Locally Finite Simple Group With A P-Group As Centralizer, U. Meierfrankenfeld
Turkish Journal of Mathematics
We show that there exists a non-linear, locally finite, simple group such that the centralizer of every non-trivial element is (locally solvable)-by-finite.
Linear Automorphism Groups Of Relatively Free Groups, A. Yu. Olshanskii
Linear Automorphism Groups Of Relatively Free Groups, A. Yu. Olshanskii
Turkish Journal of Mathematics
Let G be a free group in a variety of groups, but G is not absolutely free. We prove that the group of automorphisms Aut(G) is linear if and only if G is a finitely generated virtually nilpotent group.
Finitary Actions And Invariant Ideals, D. S. Passman
Finitary Actions And Invariant Ideals, D. S. Passman
Turkish Journal of Mathematics
Let K be a field and let G be a group. If G acts on an abelian group V, then it acts naturally on any group algebra K[V], and we are concerned with classifying the G-stable ideals of K[V]. In this paper, we consider a rather concrete situation. We take G to be an infinite locally finite simple group acting in a finitary manner on V. When G is a finitary version of a classical linear group, then we show that the augmentation ideal \omega K[G] is the unique proper G-stable ideal of K[V]. On the other hand, if G …
Modelling A Deposition Process In Collective Construction, Robert L. Stewart, R. Andrew Russell, Lindsay Kleeman
Modelling A Deposition Process In Collective Construction, Robert L. Stewart, R. Andrew Russell, Lindsay Kleeman
Turkish Journal of Electrical Engineering and Computer Sciences
During collective construction tasks, swarm robots coordinate their actions in space and time to build structures that conform to some given design or specification. In this paper, a simulation model and a mathematical model (based on a Markov chain) are introduced to describe the deposition process of a previously detailed robotic swarm system that uses templates and feedback to facilitate construction. The models are based on the behaviour and geometry of real robots and predict the dynamics observed during practical trials as well as explaining the occurrence of different spatial patterns of building blocks. Furthermore, the models provide an insight …
Gold(Iii) Complex Of Caffeine: Synthesis, Isolation And Spectroscopic Characterization, Bojidarka Ivanova
Gold(Iii) Complex Of Caffeine: Synthesis, Isolation And Spectroscopic Characterization, Bojidarka Ivanova
Turkish Journal of Chemistry
Au(III)-caffeine complex was synthesized and characterized by means of solid-state linear-dichroic infrared spectral analysis (IRLD), ^1H-NMR, MS, DSC and TGA methods. The caffeine (I) is monodentate and coordinated with metal ion through its N9 atom at molar ratio metal to ligand 1:1. The other 3 positions in the Au(III) coordination sphere are occupied by Cl^-, thus forming [Au^{3+}(C_8H_{10}N_4O_2)Cl_3] complex. IR-characteristic band assignment in the 4000-400 cm^{-1} IR region of pure ligand and corresponding Au(III)complex was performed.
Electrochemical Characteristics Of A 7-Ferrocenyl(Carbonyloxy)-1- Heptanethiol-Modified Gold Electrode, Mohammed Muzibur Rahman, Il Cheol Jeon
Electrochemical Characteristics Of A 7-Ferrocenyl(Carbonyloxy)-1- Heptanethiol-Modified Gold Electrode, Mohammed Muzibur Rahman, Il Cheol Jeon
Turkish Journal of Chemistry
The electrochemical properties of 7-ferrocenyl(carbonyloxy)-1-heptanethiol [FcCO_2(CH_2)_7SH] were characterized by an electrochemical quartz crystal microbalance (EQCM). A gold surface was modified with FcCO_2(CH_2)_7SH by the self-assembly method. EQCM was used to investigate mass change during the redox reactions of FcCO_2(CH_2)_7SH monolayers on a modified gold electrode in solution containing K_3Fe(CN)_6 redox species. The FcCO_2(CH_2)_7SH monolayer on gold acts as a mediator for the electron transfer between a gold electrode and electroactive species Fe(CN)_6^{3-/4-} in solution. In both cases, electrochemical current responses were complicated because the observed currents were due to the redox of both the ferrocenyl group immobilized on gold and …
Preparation And Characterization Of An Atenolol Selective Electrode Based On A Pvc Matrix Membrane, Nabil S. Nassory, Shabaz A. Maki, Mutaz A. Ali
Preparation And Characterization Of An Atenolol Selective Electrode Based On A Pvc Matrix Membrane, Nabil S. Nassory, Shabaz A. Maki, Mutaz A. Ali
Turkish Journal of Chemistry
Atenolol selective electrodes were prepared based on a complex atenolol-phosphotungstate as an active material using the plasticizers di-butyl phosphate (DBP), tri-butyl phosphate (TBP), o-nitro phenyl octyl ether (NPOE) and di-octyl phthalate (DOPH) in a PVC matrix membrane. The properties of the prepared electrodes were studied, namely slope, concentration range, detection limit, lifetime, pH effect and selectivity. The experimental results showed that the best electrode was based on DOPH as plasticizer, displaying a linear range from 1.00 x 10^{-4} M to 5.00 x 10^{-2} M with a Nernstian slope of 55.91 mV/decade and correlation coefficient of 0.9995. The detection limit was …
Sulfur And Lead Isotope Investigations Of The Carbonate-Hosted Pb-Zn Deposits In The Yahyalı Region, Kayseri, Southern Turkey, Osman Koptagel, Ulvi̇ Ulusoy, Anthony E. Fallick
Sulfur And Lead Isotope Investigations Of The Carbonate-Hosted Pb-Zn Deposits In The Yahyalı Region, Kayseri, Southern Turkey, Osman Koptagel, Ulvi̇ Ulusoy, Anthony E. Fallick
Turkish Journal of Earth Sciences
Carbonate-hosted Pb-Zn deposits are common in the Yahyalı region (Taurus Belt) with galena the most abundant sulfide mineral. The mean d34S values for Göynük, Celaldağı Desandre, Demircilik, Tekke, Havadan and Suçatı deposits were +0.2±0.5, +9.3±0.8, +10.7±1.3, +10.8±1.3, +11.5±2.4, -4.2±0.4%o, respectively. The mean 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb measurements for the studied deposits were 18.968±0.005, 15.741±0.005 and 39.074±0.016 for Göynük, 18.702±0.006, 15.715±0.006 and 38.883±0.021 for Celaldağı Desandre, 18.618±0.020, 15.727±0.008 and 38.852±0.032 for Demircilik, 18.808±0.017, 15.751±0.028 and 38.983±0.166 for Suçatı. The sulfur isotope systematics imply that sulfur originated from a mixture of different sources for the Göynük and Suçatı deposits, but was probably …
Studies On The Preparation Of \Alpha,\Omega -Telechelic Polymers By The Combination Of Reverse Atom Transfer Radical Polymerization And Atom Transfer Radical Coupling Processes, Bi̇nnur Aydoğan, Yusuf Yağci
Studies On The Preparation Of \Alpha,\Omega -Telechelic Polymers By The Combination Of Reverse Atom Transfer Radical Polymerization And Atom Transfer Radical Coupling Processes, Bi̇nnur Aydoğan, Yusuf Yağci
Turkish Journal of Chemistry
Monofunctional polystyrenes with cyano, carboxylic acid, and hydroxyl terminal groups were synthesized by reverse atom transfer radical polymerization (RATRP) using corresponding azo initiators in conjunction with copper and iron complexes. These functional polymers were further used in the atom transfer radical coupling (ATRC) reaction in the presence of Cu(I) and Cu(0) in order to obtain telechelic polystyrenes. In the iron-mediated system, while RATRP experiments gave satisfactory results, the corresponding ATRC process yielded polymers with low functionality. The copper-mediated system, however, gave contrary results. In the RATRP step, initiation efficiency was rather low and polymers with relatively higher polydispersity were obtained. …