Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Thin films (18)
- Optical properties (12)
- Solar cell (10)
- ZnO (10)
- Chalcogenide glasses (9)
-
- Thermodynamics (8)
- Cosmology (7)
- DFT (7)
- Density functional theory (7)
- Lattice parameter (7)
- Band gap (6)
- Elastic scattering (6)
- Electrical properties (6)
- Energy levels (6)
- Phase transition (6)
- Photoconductivity (6)
- Quantum well (6)
- Spray pyrolysis (6)
- X-ray diffraction (6)
- Bulk modulus (5)
- Cosmic ray (5)
- Decoherence (5)
- Dirac equation (5)
- Diurnal (5)
- Electrical conductivity (5)
- Entropy (5)
- Nanoparticles (5)
- Nuclear structure (5)
- Quantum dot (5)
- Schrödinger equation (5)
- Publication Year
Articles 1291 - 1320 of 1382
Full-Text Articles in Physical Sciences and Mathematics
Observation Of Events At Very High Q^2 In E^+P Collisions At Hera, A. Wagner
Observation Of Events At Very High Q^2 In E^+P Collisions At Hera, A. Wagner
Turkish Journal of Physics
Data collected at the $e^+p$ collider HERA at DESY by the experiments H1 and ZEUS have allowed to probe a previously inaccessible domain of very large $Q^2$ in deep-inelastic $ep$ scattering. For $Q^2 > 15000 GeV^2$ both experiments see more events than expected assuming the Standard Model of deep-inelastic scattering. In this report the observed events, the theoretical expectations and their comparison are discussed.
Progess In Photon Colliders, Valery Telnov
Progess In Photon Colliders, Valery Telnov
Turkish Journal of Physics
Last two years were very important in history of a photon colliders. This option is included now in conceptual design reports of the NLC, JLC and TESLA/SBLC projects. All the designs foresee two interaction regions: one for e^+e^- and the second for \gamma\gamma, \gamma e and e^-e^- collisions. This paper is focused on three aspects: 1) arguments for photon colliders; 2) parameters of current projects; 3) ultimate luminosities and energies, new ideas. Recent studies have shown that the main collision effect - coherent pair creation - is suppressed at photon colliders with the energy (2E $
High Luminosity Muon Collider Studies In The U.S.A., Muzaffer Ataç
High Luminosity Muon Collider Studies In The U.S.A., Muzaffer Ataç
Turkish Journal of Physics
Muon colliders as a future collider project in the U.S.A., have attracted many physicists from many institutions in recent years. Workshops and conferences have been held on the subject in the last few years. The studies show that high luminosity circular muon colliders can be built at high luminosities and at high center-of-mass energies. Some aspects of the muon colliders, physics possibilities, background and detector issues will be discussed. Some comparisons between the muon and hadron colliders, and electron-positron colliders, will be made.
Possibility To Measure Polarized Gluon Distribution Via Real Gamma Beam, A. Çeli̇kel
Possibility To Measure Polarized Gluon Distribution Via Real Gamma Beam, A. Çeli̇kel
Turkish Journal of Physics
We propose an experiment to measure the polarized gluon and quark distributions in scattering of polarized real $\gamma$ beam on polarized nuclear target.
Topics On The Physics Potential And Detector Aspects Of The Lc-Hera Ep Collider, A. De Roeck
Topics On The Physics Potential And Detector Aspects Of The Lc-Hera Ep Collider, A. De Roeck
Turkish Journal of Physics
We present a brief account of some physics topics which could be addressed at a collider consisting of the HERA proton ring and the future $e^+e^-$ Linear Collider. A few experimental aspects are also discussed.
Some Physical Problems For Photon Colliders, Ilya F. Ginzburg
Some Physical Problems For Photon Colliders, Ilya F. Ginzburg
Turkish Journal of Physics
Higgs hunting at different colliders is discussed with new possibilities related to photon colliders are discussed. Brief review of discovery potential for new physics is presented.
Search For Supersymmetry At \Gammap - Colliders, A. U. Yilmazer
Search For Supersymmetry At \Gammap - Colliders, A. U. Yilmazer
Turkish Journal of Physics
We discuss the possibility of searching supersymmetry at TeV scale $\gamma p$ colliders proposed recently. Theoretical predictions are derived within the framework of minimal supersymmetric standard model (MSSM) with R-parity conservation. Productions of squarks, gluinos, charginos and neutralinos through the processes $\gamma p\rightarrow\tilde{q}\tilde{w}X$, $\gamma p\rightarrow\tilde{q}\tilde{g}X$, $\gamma p\rightarrow\tilde{q}\tilde{\gamma}X$ (or $\tilde{q}\tilde{z}$) and $\gamma p\rightarrow\tilde{q}\tilde{q}^*X$ are considered. Cross sections for different initial beam polarizations are calculated and it is shown that polarization asymmetries are sensitive to the particle masses. Discovery mass limits of the superpartners are tabulated for various $\gamma p$ colliders at different center of mass energies. The results are compared with …
Tune Shift Limitations For Linac-Ring Type Colliders, Ö. Yavaş
Tune Shift Limitations For Linac-Ring Type Colliders, Ö. Yavaş
Turkish Journal of Physics
Limitations on incoherent and beam-beam tune shift values are calculated by using gaussian beam distribution for linac-ring type $ep$ colliders. The advantage of this machine is achievement of multi TeV center of mass energies in lepton-hadron interactions at sufficiently high luminosities. Tune shift puts a limit on the number of electrons per effective area for the stability of proton beam and, therefore, gives an upper bound for the luminosity.
A Proposal For A Measurement Of The Nucleon Form Factors At An Asymmetric E^+E^- Linac-Ring Collider, R. Baldini, C. Bini, P. Patteri
A Proposal For A Measurement Of The Nucleon Form Factors At An Asymmetric E^+E^- Linac-Ring Collider, R. Baldini, C. Bini, P. Patteri
Turkish Journal of Physics
The neutron electromagnetic form factors have been measured for the first time in the time-like region in the $Q^2$ range between 3.6 and 6 $GeV^2$ by the FENICE experiment. The results show some unexpected features. First the neutron magnetic form factor turns out to be larger than the proton one, the neutron electric form factor being negligible. Then there are indications of a narrow structure very near the $N\overline{N}$ threshold, in the e^+e^- multihadronic annihilation. A new, high statistics experiment is needed to clarify the indications. An asymmetric, unconventional, linac-storage ring collider is proposed, using one of the existing high …
Main Parameters Of \Gammap Colliders, A.K. Çi̇ftçi̇
Main Parameters Of \Gammap Colliders, A.K. Çi̇ftçi̇
Turkish Journal of Physics
Main parameters of TeV energy $\gamma $p colliders have been investigated for HERA+ SBLC, HERA+TESLA, HERA+e-linac, LHC+TESLA, LHC+CLIC and LHC+$e$ -linac proposals. Luminosity of $\gamma p$ collisions for these colliders are studied in terms of a distance between the conversion region and the collision point.
Main Parameters Of Linac-Ring Type E-Nucleus And \Gamma-Nucleus Colliders, Ş. Turköz
Main Parameters Of Linac-Ring Type E-Nucleus And \Gamma-Nucleus Colliders, Ş. Turköz
Turkish Journal of Physics
The main parameters of linac-ring type e-nucleus and $\gamma $-nucleus colliders are considered. It is shown that the reasonable luminosities at the multi-TeV energies can be achieved.
Electroweak Gauge Boson Production At \Gamma\Gamma Collider, G. Jikia
Electroweak Gauge Boson Production At \Gamma\Gamma Collider, G. Jikia
Turkish Journal of Physics
No abstract provided.
Ordinary And Coherent Bremsstrahlung At Linac-Ring Ep Colliders, V.G. Serbo, D.V. Serebryakova
Ordinary And Coherent Bremsstrahlung At Linac-Ring Ep Colliders, V.G. Serbo, D.V. Serebryakova
Turkish Journal of Physics
The ordinary bremsstrahlung $ep \rightarrow ep\gamma$ can be used at the linac-ring $ep$ colliders for luminosity measurement. It is known that at high energies this process has a large correction due to beam-size effect. We have calculated this effect for $ep$ colliders of the linac-ring type. For the LHC+CLIC collider the correction exceeds 10\% for $E_{\gamma} < 0.95\;E_e$. As a rule, the bremsstrahlung of protons in the $ep$ scattering is not considered due to its small cross section. However, if the photon energy $E_{\gamma}$ becomes small enough, the number of produced photons become large because in this case the radiation is determined by the interaction of a proton with the collective electromagnetic field of the electron bunch. It is coherent bremsstrahlung (CBS). We present the main characteristics of CBS calculated for linac-ring $ep$ colliders. At the LHC+CLIC collider it should be about $1700 \; dE_\gamma /E_\gamma$ photons for a single collision of bunches at $E_\gamma \stackrel{
The Heavy Higgs Effects In The Framework Of Sm, V. Borodulin, G. Jikia
The Heavy Higgs Effects In The Framework Of Sm, V. Borodulin, G. Jikia
Turkish Journal of Physics
No abstract provided.
Discovery Limits For New Resonances At Ep And \Gammap Colliders, M. Kantar
Discovery Limits For New Resonances At Ep And \Gammap Colliders, M. Kantar
Turkish Journal of Physics
We study the resonance production of new particles at Linac-Ring type $ep$ and $\gamma p$ colliders.
A Possibility To Control The Polarization Of High-Energy Photons By Means Of A Laser Beam, G.L. Kotkin, V.G. Serbo
A Possibility To Control The Polarization Of High-Energy Photons By Means Of A Laser Beam, G.L. Kotkin, V.G. Serbo
Turkish Journal of Physics
The elastic light-light scattering below the threshold of the $e^+e^-$ pair production leads to a variation in polarization of hard $\gamma$-quanta traversing without loss a region where the laser light is focused. This effect can be used to control the $\gamma$-quantum polarization. Equations are obtained which determine the variation of Stokes parameters of $\gamma$-quanta in this case, and their solutions are given. It is pointed out that this effect can be observed in the experiment E-144 at SLAC. It should be taken into account and, perhaps, it can be used in experiments at future $\gamma \gamma$ colliders.
Transfer Of Photometric Quantities At Arbitrary Distribution Temperatures, İzmir Mamedbeyli̇, Zafer Ürey, A. Kamuran Türkoğlu
Transfer Of Photometric Quantities At Arbitrary Distribution Temperatures, İzmir Mamedbeyli̇, Zafer Ürey, A. Kamuran Türkoğlu
Turkish Journal of Physics
Characteristics of a photometric setup used for the measurement of photometric quantities at the National Institute of Metrology (UME) in Turkey are reported. A high accuracy method is developed to adjust the filaments of incandescent lamps with respect to the optical axis. The method also provides the basis for low uncertainty distance measurements between lamp filaments and photometers. Transfer of photometric quantities at arbitrary distribution temperatures is examined both theoretically and experimentally, and the results are compared to the calibration values of the Bureau International Des Poids Et Measures (BIPM), Paris, France.
Low-Temperature Phase Transition In Tl In Se_{2} Crystals, Oktay Zeynelabidin O Alekperov, Mazahir Amirjan Oglu Aljanov, Elmira M. Ali Gizi Keri̇mova
Low-Temperature Phase Transition In Tl In Se_{2} Crystals, Oktay Zeynelabidin O Alekperov, Mazahir Amirjan Oglu Aljanov, Elmira M. Ali Gizi Keri̇mova
Turkish Journal of Physics
Heat capacity, lattice parameter, spectral and temperature dependences of photoconductivity of chained crystal Tl In Se_{2} have been investigated in this work. For the first time, it has been found that the phase transtion takes plase at temperatures 135 and 184 K in this crystal. The changes of heat capacity, photoconductivity and lattice parameter of Tl In Se_{2} in the region of phase transition is supposed to be connected with the presence of an incommensurate phase in this crystal.
Coulomb Breakup Of Nucleus ^6 Li On Ion ^{208}Pb, B. F. Irgaziev, H. T. Ergashbaev
Coulomb Breakup Of Nucleus ^6 Li On Ion ^{208}Pb, B. F. Irgaziev, H. T. Ergashbaev
Turkish Journal of Physics
In the framework of the three-body approach the A(a,bc)A Coulomb breakup has been investigated. The three-body Coulomb dynamic is taken into account to derive the expression for the reaction matrix element. The mechanism of the breakup includes the direct process and the excitation of resonance state of the particle a. The calculation of the triple differential cross section of the ^{208}Pb(^6Li, \alpha d)^{208}Pb Coulomb dissociation have been performed in the energy region E_{\alpha d} < 1MeV. Calculations for the Coulomb dissociation ^{208}Pb(^6Li, \alpha d)^{208}Pb, including consideration of the triple cross section going through the first resonance of ^6Li have been performed. The results of the calculations are compared with experimental data.
Formation Of Hot Zone By The Application Of An Electric Field To Superconducting Bi_{1.6}Pb_{0.4}Sr_2ca_3cu_4o_X (2234) Rod, E. Yanmaz
Turkish Journal of Physics
The formation of hot zone by electric field on superconducting Bi-Pb-Sr-Ca-Cu-O (BSCCO) rods is described. Bulk samples with a nominal composition of Bi_{1.6}Pb_{0.4}Sr_2Ca_3Cu_4O_x (2234) were prepared as rods by a melt casting process. An electrical field was applied to the BSCCO rods and this current caused the resistance of the rod to fall and after a few minutes the initial voltage fell while the current was increased to 2.5A. Under certain conditions, a well-defined hot zone formed at the positive electrode, travelled along the rod and eventually disappeared on reaching the negative electrode. A small increase in the applied current …
Calculation Of The Reaction Cross-Section For Proton-Nucleus Using Recently Optical Potential, M. M. Osman
Calculation Of The Reaction Cross-Section For Proton-Nucleus Using Recently Optical Potential, M. M. Osman
Turkish Journal of Physics
The eikonal approximation is used to calculate the reaction cross-section for proton scattering from different nuclei. The imaginary proton - nucleus optical potential is derived from relativistic mean field theory approach. We found a fair agreement with experimental data.
The Eect Of Exposure Time To Clean Room Air On Characteristic Parameters Of Au /Epilayer N-Si Schottky Diodes, M. Sağlam, Ç. Nuhoğlu, E. Ayyildiz, A. Türüt, H.A. Çeti̇nkara
The Eect Of Exposure Time To Clean Room Air On Characteristic Parameters Of Au /Epilayer N-Si Schottky Diodes, M. Sağlam, Ç. Nuhoğlu, E. Ayyildiz, A. Türüt, H.A. Çeti̇nkara
Turkish Journal of Physics
A study has been made on determination and comparison of current-voltage (I-V) and capacitance-voltage (C-V) characteristics parameters of $Au/n-Si$ Schottky barrier diodes (SBDs) with and without thin native oxide layer fabricated on $n$-type $Si$ grown by LPE (Liquid-phase Epitaxy) technique. The native oxide layer with different thicknesses on chemically cleaned on $Si$ surface were obtained by exposing the surfaces to clean room air before evaporating metal. The native oxide thicknesses of samples D2, D3, D4 and D5 are in the form $D2 < D3 < D4 \leq D5$, depending on the exposing time. It has been seen that the values of barrier height $\Phi_b$ of samples D2(0.64 eV), D3(0.66 eV), D4(0.69 eV) and D5(0.69 eV) with the interfacial layer increased with increasing the exposure time and tended to that of the initial sample D1 (nonoxidezed sample, 0.74 eV), and thus also their I-V and C-V curves. The reverse current of sample D1 showed slight nonsaturating behavior. This ''soft'' behavior has been ascribed to the spatial inhomogeneity in the barrier heights at the MS interface. In particular, reverse bias curves of samples D2, D3, D4 and D5 have shown excellent saturation which may be attributed to the passivation of the semiconductor surface states by the native oxide layer which reduces the penetration of the wave functions of electron in the metal into the semiconductor. Especially, the I-V characteristics and experimental parameters of our devices are in agreement with recently reported results revealed by the pulsed surface photovoltage technique for the electronic properties of the HF-treated Si surface during initial oxidation in air.
Measurement Of The Compton And Coherent Scattering Differential Cross-Sections, Yakup Kurucu, Salih Erzeneoğlu, Rıdvan Durak, Yusuf Şahi̇n
Measurement Of The Compton And Coherent Scattering Differential Cross-Sections, Yakup Kurucu, Salih Erzeneoğlu, Rıdvan Durak, Yusuf Şahi̇n
Turkish Journal of Physics
The total atomic Compton and coherent scattering differential cross section of Al, Sn and Ta for 59.5 keV gamma rays of Am-241 point source have been measured for scattering angles $\theta=81^{\circ}$, $85.5^{\circ}$, $90^{\circ}$ and $94.5^{\circ}$ by a direct method with an energy dispersive x-ray spectrometer. The background correction and detection efficiency are also included the study. The experimental results are comparatively given with some available theoretical data obtained with some approximation methods.
The Influence Of Solvents On Formation Of The Molecular Geometry Of [{Fe(Salphen)}_2o], Mehmet Kabak, Ayhan Elmali
The Influence Of Solvents On Formation Of The Molecular Geometry Of [{Fe(Salphen)}_2o], Mehmet Kabak, Ayhan Elmali
Turkish Journal of Physics
The crystal structure and magnetic properties of the complex (I)=[$\{$Fe(salphen)$\}_2$\-O]$\cdot$(C$_4$\-H$_8$SO) and (II)=[$\{$Fe(salphen)$\}_2$O]$\cdot$(C$_4$H$_8$O$_2$)\- (salphen H$_2$=N,N'-o-phenylenebis\-(salicylidene-imine)) were recently reported [1, 2]. This complex crystallized with the solvents of dimethyl sulfoxide and dioxane. In this paper, we investigate the influence of the solvents on the formation of the molecular geometry and study the orbital mechanism of the magnetic super-exchange interactions of this complex.
The Relation Between Dislocation Density And Crystal Crosscut In \Beta-Sn Grown By Modified Bridgman Method, Bahattin Düzgün, İbrahim Karaman, Nazım Uçar
The Relation Between Dislocation Density And Crystal Crosscut In \Beta-Sn Grown By Modified Bridgman Method, Bahattin Düzgün, İbrahim Karaman, Nazım Uçar
Turkish Journal of Physics
Crystals $\beta$-Sn are grown from ingots of 99.99\% purity by modified Bridgman method under $10^{-3}$ torr pressure and oriented by Laue back reflection method. The relation between crystal crosscut and dislocation density calculated using etch hillock technique is investigated. It is found that the dislocation density increases with increasing crystal crosscut.
A Study Of Events From Si 28 With Emulsion At 4.5 A Gev/C Without Target Fragmentation, A.A. El-Daiem
A Study Of Events From Si 28 With Emulsion At 4.5 A Gev/C Without Target Fragmentation, A.A. El-Daiem
Turkish Journal of Physics
Atotal sample of 1000 inelastic interactions of Si$^{28}$ in emulsion at 4.5 A GeV/c has been used characteristics of projectile fragments. This paper is therefore to devoted to the study of projectile fragments, with special attention to the class of events $n_h$=0, in which the traget nucleus is unwounded. This paper include the multiplicity distributinon and angular distributions of projectile fragments.
Isotope Effect And Phonon Softening In Superconducting Borocarbides And Boronitrides, Tuğrul Haki̇oğlu, Valery A. Ivanov
Isotope Effect And Phonon Softening In Superconducting Borocarbides And Boronitrides, Tuğrul Haki̇oğlu, Valery A. Ivanov
Turkish Journal of Physics
The isotope effect in the recently disvovered class o superconductors LuNi_2B_2C and La_3Ni_2B_2N_3 is investigated in the context of electron-squezed phonon interaction renormalizing the Ni-d electron-electron correlations. Squeezed phonon mode originates from the anharmonic character of the tetragonal Ni-B structure and is polarized in the vortical direction to the Ni layers. The isotope effect arises as a result of the zero point motion of the Ni-Ni d-electron hopping amplitude dominantly due to this vertical phonon mode. Within this model the isotope exponent is calculated to be \alpha_B \leq 0.20 as compared to the recently found experimental value \alpha_B^{exp} = 0.27 …
Structural And Optical Characterisation Of Vacuum Deposited Cdte Thin Films, Murat Bayhan
Structural And Optical Characterisation Of Vacuum Deposited Cdte Thin Films, Murat Bayhan
Turkish Journal of Physics
The structural and optical properties of vacuum deposited CdTe thin films on glass substrates were investigated. The effect of the heat treatment in air over the former properties of the layers was also examined. Grain sizes of air heated layers estimated by net broading in the XRD spectra were found to be larger than as-grown layers, confirming that grain growth had occurred during the heat treatment. RHEED patterns of the layers grown at substrate temperatures between 150°C and 170°C had a distinct \{111\} preferred orientation. As-grown CdTe layers were slightly p-type, but highly resistive. Air heat treated layers were p-type …
The Space-Time Critical Dimension Of An Open Parabosonic String, N. Mebarki & N. Belaloui, M. Haouchine
The Space-Time Critical Dimension Of An Open Parabosonic String, N. Mebarki & N. Belaloui, M. Haouchine
Turkish Journal of Physics
Using analytical properties of a 1-loop open parabosonic M-point transition amplitude, we show that the space-time critical dimension depends on the order of the paraquantization.
Study Of Emission Parameters Of Ir(Iii)-Ba Film System, F. K. Yusifov, A. K. Orujov
Study Of Emission Parameters Of Ir(Iii)-Ba Film System, F. K. Yusifov, A. K. Orujov
Turkish Journal of Physics
Electrophysical properties of Ir(III)-Ba metal-film system have been studied by thermoionic emission (TE), surface ionization (SI) and thermal desorption spectroscopy (TDS) methods. It has been found that the optimum coverage of barium atoms on iridium (III) face is \theta_{opt} = 0.70 \pm 0.05. The dependence of fractional charge of Richardson constant of Ir(III)-Ba metal-film system on coverage \theta of the Ba atoms in the interval 0 \leq \theta \leq 1 has been experimentally obtained. The dependence of work function of Ir(III)-Ba metal-film system on coverage \theta of Ba atoms has been obtained.