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Articles 1231 - 1260 of 1374
Full-Text Articles in Physical Sciences and Mathematics
Gauge Theory Of Phase And Scale, Marek Pawlowski
Gauge Theory Of Phase And Scale, Marek Pawlowski
Turkish Journal of Physics
Old Weyl's the idea of scale recalibration freedom and Infeld's and van der Waerden's (IW) ideas concerning geometrical interpretation of natural spinor phase gauge symmetry are discussed in the context of modern models of fundamental particle interactions. It is argued that (IW) gauge symmetry can be naturaly identified with the U(1) symmetry of the Weinberg-Salam model. It is also argued that there are no serious reasons to reject Weyl's gauge theory from consideration. Its inclusion enriches the original Weinberg-Salam theory and leads to prediction of new phenomena that do not contradict experiments.
Algebraic Implementation Of Gauss' Law, Andrzej Herdegen
Algebraic Implementation Of Gauss' Law, Andrzej Herdegen
Turkish Journal of Physics
A C^*-algebraic model may be constructed for the description of asymptotic fields in quantum electrodynamics. In this model charged fields carry the asymptotic Coulomb field of associated charged particles.
On The Concept Of Spin In Electrodynamics, Ivangoe Pestov
On The Concept Of Spin In Electrodynamics, Ivangoe Pestov
Turkish Journal of Physics
It is substantiated that spin is a notion associated with the group of internal symmetry that is tightly connected with the geometrical structure of spacetime. The wave equation for the description of a particle with spin one half is proposed. On this ground it is shown that the spin of electron is exhibited through the quantum number and accordingly the Dirac equation describes properties of particles with the projection of spin \pm \hbar/2. On the contrary, we put forward the conjecture that the spin of the quark cannot be considered as a quantum number, but only as an origin of …
New Aspects Of Vavilov-Cherenkov Radiation, Georgy Afanasiev, Vladimir Kartavenko
New Aspects Of Vavilov-Cherenkov Radiation, Georgy Afanasiev, Vladimir Kartavenko
Turkish Journal of Physics
The effects arising from accelerated and decelerated motion of charged point particles inside a medium are studied. It is shown explicitly that, in addition to the bremsstrahlung and Cherenkov shock wave, the electromagnetic shock wave arising from the charge velocity exceeding the medium light velocity should be observed. This shock wave has the same singularity as the Cherenkov one and therefore, it is more singular than the bremsstrahlung shock wave. The space-time regions where these shock waves exist and conditionsunder which they appear are determined.
The Gauge Freedoms Of Enlarged Helmholtz Theorem And Debye Potentials; Their Use In The Multipole Expansion Of Conserved Current, Elena N. Bukina, Vladimir M. Dubovik
The Gauge Freedoms Of Enlarged Helmholtz Theorem And Debye Potentials; Their Use In The Multipole Expansion Of Conserved Current, Elena N. Bukina, Vladimir M. Dubovik
Turkish Journal of Physics
We discuss gauge freedom within the scope of the enlarged Helmholtz theorem and Neumann-Debye decomposition and then demonstrate its realization for the multipole expansion of a conserved electromagnetic current. The exact solution to the latter problem was obtained in 1974, but answers to some purely mathematical questions raised by I.B. French and Y. Shimamoto [1] about 40 years ago are given in this paper for the first time.
Natural Terrestrial Electromagnetic Fields Of Extremely Low Frequencies And Detection Of Periodic Gravitational Radiation, L. V. Grunskaya, D. V. Vinogradov
Natural Terrestrial Electromagnetic Fields Of Extremely Low Frequencies And Detection Of Periodic Gravitational Radiation, L. V. Grunskaya, D. V. Vinogradov
Turkish Journal of Physics
The present research is connected with nontraditional ways of detecting periodic gravitational radiation. Some records of extremely low frequency variations of electromagnetic fields of Earth with extracting periodicities are realized corresponding to the source of gravitational radiation of geophysical and astrophysical origin.
On The Experimental Search For Photon Mixing, Vsevolod Popov
On The Experimental Search For Photon Mixing, Vsevolod Popov
Turkish Journal of Physics
The experimental searches for photon mixing in the Okun model [1] are discussed.
Influence Of Electrical Field On Pulsed Laser Beam Welding Of Stainless Steel (304), Salah A. H. Fawzi̇, Raz N. Ari̇f
Influence Of Electrical Field On Pulsed Laser Beam Welding Of Stainless Steel (304), Salah A. H. Fawzi̇, Raz N. Ari̇f
Turkish Journal of Physics
Pulsed laser beam welding experiment were carried out on stainless steel (SUS 304), using vertical and horizontal electric fields of different intensities to study its effectiveness on the welding process, regarding depth and weld quality. Pulsed Nd: YAG laser emitting 10 ms pulses in the TEM_{00} mode at 1.06 \mu m wave length was employed, microstructure of welded zone and defect were investigated using optical and scanning electron microscopes. Tensile test and microhardness measurements were carried out to evaluate the weld quality. Welding by this method increased the efficiency tremendously and a depth increase of 85% was achieved.
Effect Of Ionizing Radiation On The Silicon Impatt Diode Characteristics, M. B. Tagaev
Effect Of Ionizing Radiation On The Silicon Impatt Diode Characteristics, M. B. Tagaev
Turkish Journal of Physics
We investigated the effect of ^{60}Co \gamma-irradiation (doses from 10^2 to 2 \times 10^6 Gy), both without and with heat annealing, on silicon IMPATT diode parameters. It is shown that such treatments improve the diode characteristics (particularly decrease the reverse current and increase both the output and the diffusion length of the minority charge carriers) due to radiation-enhanced processes.
Supersymmetric Electroweak Radiative Corrections To E^+ E^- -> W^+W^-, S. Alam
Supersymmetric Electroweak Radiative Corrections To E^+ E^- -> W^+W^-, S. Alam
Turkish Journal of Physics
In this short note we summarize some of the work of our thesis, which is also reported elsewhere in detail. We have examined the one loop quantum corrections to the W pair production in the electron positron annihilation in the context of supersymmetric electroweak theory. We have adopted the On Mass Shell Renormalization scheme of Sakakibara and previously demonstrated the consistency of this scheme. The relevant analytic results are written out. A complete computer program for these corrections has been developed. This program has been checked in several ways to ensure against errors over the life of the calculation where …
Implications Of \Delta\Rho And Charm Ii Data For Z' Physics, Durmuş Ali̇ Demi̇r
Implications Of \Delta\Rho And Charm Ii Data For Z' Physics, Durmuş Ali̇ Demi̇r
Turkish Journal of Physics
We discuss the constraints on the Z^{\prime} model parameters coming from Z-pole and low-energy \nu_{\mu}-e scattering data in the frame work of GUT-motivated models. We find that when the coupling constant of the extra U(1) is small (large) the parameter space is mainly determined by the Z-pole (the low-energy \nu_{\mu}-e scattering) data.
Electrodynamics With Toroid Polarization, V. M. Dubovik, B. H. Saha
Electrodynamics With Toroid Polarization, V. M. Dubovik, B. H. Saha
Turkish Journal of Physics
A modified system of equations of electrodynamics of continuous media has been obtained. Beside the Lagrangian system an alternative gauge-like formalism has been developed to introduce the toroid moment contributions in the obtained equations. The two potential formalism that was worked out by us earlier has been developed further where along with the two vector potentials we introduce two scalar potentials thus taking into account all four basic equations of electromagnetism.
Nanosecond Duration Broadband Luminescence Of Quartz Glasses, Maruf A. Kasymdzhanov, Pulat K. Khabibullaev, Saidislam S. Kurbanov
Nanosecond Duration Broadband Luminescence Of Quartz Glasses, Maruf A. Kasymdzhanov, Pulat K. Khabibullaev, Saidislam S. Kurbanov
Turkish Journal of Physics
The results of investigations of luminescence, excited by radiations of $N_2$- and $Nd^{3+}$: YAG-lasers ($\lambda = 337 nm, \lambda = 532 nm$) in high purity quartz glasses are reported. The luminescence has broad spectrum (350-850 nm) and very short duration (1-20 ns).
Production Of Susy Particles In Polarized \Gammap Collisions, A. Kandemi̇r
Production Of Susy Particles In Polarized \Gammap Collisions, A. Kandemi̇r
Turkish Journal of Physics
We discuss the production of several SUSY particles in the high energy collisions of the real photons off the protons within the MSSM. The polarizations of the colliding beams are also considered. The discovery mass limits for the squark and gluinos are presented and we conclude that the capacity of the future TeV scale $\gamma p$ colliders is quite promising in the search for SUSY particles.
Resummation Of Ir Renormalons In A Single Meson Photoproduction, Shahin S. Agaev
Resummation Of Ir Renormalons In A Single Meson Photoproduction, Shahin S. Agaev
Turkish Journal of Physics
Single pseudoscalar and vector mesons hard semi-inclusive photoproduction $\gamma h\rightarrow MX $ via higher twist mechanism is calculated using the QCD running coupling constant method. It is proved that in the context of this method a higher twist contribution to the photoproduction cross section cannot be normalized in terms of the meson electromagnetic form factor. The structure of infrared renormalon singularities of the higher twist subprocess cross section and the resummed expression (the Borel sum) for it are found. Comparisons are made with earlier results, as well as with leading twist cross section. Phenomenological effects of studied contributions for $\pi, …
Heavy Quark Production At \Gammap Colliders, O. Çakir, M. Yilmaz
Heavy Quark Production At \Gammap Colliders, O. Çakir, M. Yilmaz
Turkish Journal of Physics
Heavy quark pair production at $\gamma p$ colliders is discussed. It is shown that the numbers of $t\bar{t}$ pairs are sufficiently large for investigation of the top quark properties in detail.
Hard Diffractive Photoproduction With Rapidity Gap, Ilya F. Ginzburg
Hard Diffractive Photoproduction With Rapidity Gap, Ilya F. Ginzburg
Turkish Journal of Physics
Hard diffractive photoproduction with rapidity gap is the best place for study of perturbative Pomeron. Some predictions of pQCD and the range of their applicability are described.
Theoretical Analysis Of The Crystallography For Do_3 --> M18r Martensitic Transformation, Seyfettin Çakmak, Ekrem Artunç
Theoretical Analysis Of The Crystallography For Do_3 --> M18r Martensitic Transformation, Seyfettin Çakmak, Ekrem Artunç
Turkish Journal of Physics
A mathematical approach of the phenomenological theory has been applied to the martensitic transformation of DO$_3 \rightarrow$ M18R close-packed structure. The crystallography of DO$_3 \rightarrow$ M18R martensitic transformation in Fe-25.8 wt\%Mn-7.4wt\%Al-0.11wt\%C alloy was studied using single crystals. Martensitic crystallographic parameters such as habit plane, magnitude of lattice invariant shear, shape deformation direction and orientation relationships are calculated with new mathematical approach. Phenomenological theoretical calculations were compared with predictions of the phenomenological crystallographic CRAB theory and with experimental observations.
Singlet Axial Current Form Factor In The Chiral Solitonic Bag Model With Massive Quarks, N. Karagöz
Singlet Axial Current Form Factor In The Chiral Solitonic Bag Model With Massive Quarks, N. Karagöz
Turkish Journal of Physics
Singlet axial current form factor $g_A^0$ is calculated as a function of bag radius in the two flavor chiral solitonic bag model with unequal quark masses. The value of $g_A^0$ near 1 fm is sufficiently small.
The Determination Of Thermal Annealing Effect On The Dos Profile Of A-Si:H Film, Tülay Seri̇n
The Determination Of Thermal Annealing Effect On The Dos Profile Of A-Si:H Film, Tülay Seri̇n
Turkish Journal of Physics
In this study the aim was to investigate the effect of thermal annealing on the density of states (DOS) of hydrogenated amorphous silicon (a-Si:H) by means of a Schottky structure. In order to realize that goal the sandwich structured Au/a-Si:H/a-Si:H(n$^+$-type)/Cr Schottky diode was fabricated. The junction capacitance of the samples were measured as a function of the amplitude of alternating voltage in the frequency range of 500 Hz - 100 KHz and in the annealing temperature range of 23 - 175^oC. The density of states profile as a function of both annealing temperature and energy were plotted. The effect of …
The Milne And The Constant Source Problems For The Fbis Kernel, M.Ç .. Güleçyüz, A. Kaşkaş
The Milne And The Constant Source Problems For The Fbis Kernel, M.Ç .. Güleçyüz, A. Kaşkaş
Turkish Journal of Physics
Transport solutions to the monoenergetic constant source and the Milne problems for the forward-backward-isotropic scattering (FBIS) kernel are obtained by method of singular expansion modes. The monoenergetic linear transport equation for extremely anisotropic scattering with constant source is reduced to a transport equation with isotropic scattering. The expansion coefficient is obtained in a form involving exact integral equations and determined by the accompanying new boundary conditions and the half-range orthogonality relations. In the zeroth order approximation, the analytical expressions for neutron density and the emergent angular distributions are also obtained as a function of forward scattering.
Fibonaccization And Multiparameter Q-Oscillator, M. Arik, T. Rador, G. Ünel
Fibonaccization And Multiparameter Q-Oscillator, M. Arik, T. Rador, G. Ünel
Turkish Journal of Physics
Starting from Coon-Baker-Yu (CBY) q-oscillator, a two parameter, multidimensional q-oscillator is formulated. It is shown that this procedure, called Fibonaccization, can be extended to any number of parameters. The relation between CBY states and Fibonacci CBY states are also investigated.
Study Of The Total Reaction Cross Section Of 17.0 Mev=N 132 Xe + 238 U Heavy Ion Interactions, J.J. Baluch, E.U. Khan, M.S. Zafar, I.E. Qureshi
Study Of The Total Reaction Cross Section Of 17.0 Mev=N 132 Xe + 238 U Heavy Ion Interactions, J.J. Baluch, E.U. Khan, M.S. Zafar, I.E. Qureshi
Turkish Journal of Physics
We have studied heavy ion nuclear interactions of 17.0 $MeV/N$ $^{132}Xe+^{238}U$ using muscovite mica as Solid State Nuclear Track Detector (SSNTD). Experimental reaction cross section has been determined by two independent methods. Theoretical reaction cross section has been calculated by a classical formula taking into account the energy dependence of the nuclear radius parameter. The cross section determined in the present work has been compared with those at two other energies for the same reaction.
Influence Of Thermal Conductive Material On The Activation Energy Of Amorphous Silicon Thin Films, Sevilay Uğur, Merih Seri̇n
Influence Of Thermal Conductive Material On The Activation Energy Of Amorphous Silicon Thin Films, Sevilay Uğur, Merih Seri̇n
Turkish Journal of Physics
The activation energy of amorphous silicon thin films are usually measured by placing the thin film sample on a heating surface and monitoring the change in the dark conductivity as a function of temperature. The most widely used devices for temperature measurements are surface thermometers and thermocouples. Sensors such as surface thermometers or thermocouples simply measure temperature by reaching an equilibrium state with the measured environment. If the heat conduction to the sensor somehow is obscured by several reasons (sensors having a much larger dimensions than the thin film or not having proper vacuum) different thermal conduction to the sensor …
A Review Of E^+E^- Linear Colliders, D. Trines
A Review Of E^+E^- Linear Colliders, D. Trines
Turkish Journal of Physics
No abstract provided.
Four Ways To Tev Scale, S. Sultansoy
Four Ways To Tev Scale, S. Sultansoy
Turkish Journal of Physics
Four known types of colliders, which may give an opportunity to achieve TeV center of mass energies in the near future (10-15 years), are discussed. Parameters of the linac-ring type $ep$ and $\gamma p$ machines are roughly estimated. Some speculations on TeV scale physics are given. The physics goals of the TeV energy $ep$ and $\gamma p$ colliders are considered.
Rotation In Stars, Halil Kirbiyik
Rotation In Stars, Halil Kirbiyik
Turkish Journal of Physics
In this study the subject of rotation in stars and its effects have been considered. First the historical development of the subject is reviewed. After discussing the observational aspects of rotation, the effect of rotation on evolution has been investigated. The velocity of rotational meridional circulation currents and related time scales were estimated. Mixing induced by circulation currents and the turbulence which may appear as a result of such a mixing have been studied. Order of magnitude calculations have shown that rotational mixing may occur in early type stars and thus contributes to the diffusion of chemical elements. Thus, it …
The Solutions Of The Classical Relativistic Two-Body Equation, Coşkun Önem
The Solutions Of The Classical Relativistic Two-Body Equation, Coşkun Önem
Turkish Journal of Physics
With the relativistic Kepler problem, a two-body system is studied for positronium, the hydrogen atom and $m_2 >> m_1$ cases.
Dimensionality And Energy Levels Of Quantum Mechanical Systems, Harry A. Mavromatis
Dimensionality And Energy Levels Of Quantum Mechanical Systems, Harry A. Mavromatis
Turkish Journal of Physics
The $N$-dimensional Schrödinger equation involving a general, central potential $V_N(r)$, is decomposed into a 3-dimensional component plus a term that may be treated as a dimension-dependent perturbation. This allows discussion of the general $N$-dimensional system from a 3-dimensional perspective.
Current-Voltage Characteristics And Photoresponse Of Metal Metal Devices, K. Singh, S.N.A. Hammond
Current-Voltage Characteristics And Photoresponse Of Metal Metal Devices, K. Singh, S.N.A. Hammond
Turkish Journal of Physics
Thin films (35 \AA) of $Al_2O_3$ on glass slides have been used for the fabrication of $Al/Al_2O_3/Al, Ag/Al_2O_3/Al$ and $Cu/Al_2O_3/Al$ devices. The room temperature current-voltage characteristics and the dependence of current densities of these devices at various wavelength $(\lambda)$ of light were measured. The results obtained on current density and photocurrent show that $Al_2O_3$ films have the potential for wider applications like antireflective coatings or treatments in photovoltaic devices, transparent insulation materials, and optical trapping surfaces in many electronic devices.