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Articles 18601 - 18630 of 18792
Full-Text Articles in Entire DC Network
Statistical Physics, Neural Networks, Brain Studies, Gerard Toulouse
Statistical Physics, Neural Networks, Brain Studies, Gerard Toulouse
Turkish Journal of Physics
An overview of some aspects of a vast domain, located at the crossroads of physics, biology and computer science is presented: 1) During the last fifteen years, physicists advancing along various pathways have come into contact with biology (computational neurosciences) and engineering (formal neural nets). 2) This move may actually be viewed as one component in a larger picture. A prominent trend of recent years, observable over many countries, has been the establishment of interdisciplinary centers devoted to the study of: cognitive sciences; natural and artificial intelligence; brain, mind and behaviour; perception and action; learning and memory; robotics; man-machine communication, …
Novel Detectors And Lasers For Telecommunications, Anthony J. Vickers, Hamid R. Mashayekhi, Pattara Aiyarak, Diego Oriato
Novel Detectors And Lasers For Telecommunications, Anthony J. Vickers, Hamid R. Mashayekhi, Pattara Aiyarak, Diego Oriato
Turkish Journal of Physics
For the most part the field of optoelectronics has been dominated by the pn junction for both detector and laser applications. This domination will probably hold true for laser applications for many more years although the simple forward biased junction may be challenged by other novel approaches as increased complexity is required such as multi-wavelength emission, wavelength conversion, and Thz operation. The first real novel use of the pn junction was developed by Balkan et al. [1]. Their HELLISH device paved the way for novel approaches in the use of the pn junction. In this paper I shall introduce another …
Silicon-Based Optoelectronics: Progress And Challenges, Tamim P. Sidiki, Clivia M. Sotomayor Torres
Silicon-Based Optoelectronics: Progress And Challenges, Tamim P. Sidiki, Clivia M. Sotomayor Torres
Turkish Journal of Physics
We review the status of silicon-based optoelectronics with emphasis on light emitting diodes. Erbium-doped Si, por-Si and silicon-based superlattices and nanostructures are discussed. The origin behind light emission in silicon with feature sizes below about 60 nm still remains poorly understood.
Characterization Of Inas/Gaas Qd Structures By Hrem And Pl Spectroscopy, Y. Ati̇ci̇, D. Cherns, A. Polimeni, M. Henini, L. Eaves
Characterization Of Inas/Gaas Qd Structures By Hrem And Pl Spectroscopy, Y. Ati̇ci̇, D. Cherns, A. Polimeni, M. Henini, L. Eaves
Turkish Journal of Physics
No abstract provided.
An Investigation Of Electrical Properties Of Porous Silicon, G. Algün, M. Ç. Arikan
An Investigation Of Electrical Properties Of Porous Silicon, G. Algün, M. Ç. Arikan
Turkish Journal of Physics
In this work, electrical properties of porous silicon structures, formed with electrochemical anodization in HF acid solution under two different current densities, were investigated. In these experiments, Sb doped (111)-oriented n-type silicon samples with 0.006-0.015 \Omega cm resistivity was used. Samples were anodized in a solution of 38% HF and 99% C_2H_2OH at 1:1 ratio for 15 minutes. After anodization, the structures that formed at low current density (J = 5 mA/cm^2) was compared with structures that formed at high current density (J = 30 mA/cm^2). Both structures and electrical properties were investigated.
Carrier Transport And Band Offsets In Two Dimensional Heterostructures, Hi̇lmi̇ Ünlü
Carrier Transport And Band Offsets In Two Dimensional Heterostructures, Hi̇lmi̇ Ünlü
Turkish Journal of Physics
Advances in the low dimensional heterojunction device technology cannot be complete without adequate and reliable analytic model for determining interface properties such as band offsets needed to study the carrier transport and to evaluate the device performance at high temperatures and pressures. In this article, using the extended universal tight binding model of semiconductors, a new way of determining the band offsets in heterostructures is presented. In this model the band offsets are first determined by aligning the vacuum level, defined relative to valence band maximum which is screened by optical dielectric constant of semiconductors, at the interface at absolute …
Quantum Mechanics Of The Electric Charge, Andrzej Staruszkiewicz
Quantum Mechanics Of The Electric Charge, Andrzej Staruszkiewicz
Turkish Journal of Physics
The Author summarizes the evidence that his quantum theory of the electric charge depends in a nontrivial way on the numerical value of the fine structure constant.
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.
The Wigner Problem In Electrodynamics, Andrzej Horzela
The Wigner Problem In Electrodynamics, Andrzej Horzela
Turkish Journal of Physics
The relation between canonical commutation rules and a shape of acting force is analysed. It is shown that canonical commutation relations and Newtonian equations of motion for a single particle dynamics do imply the force to be of the Lorentz type but the inverse is not true. The example of a single particle motion in a constant magnetic field shows that equations of motion allow an alternative to canonical commutation relations to exist and it is a Lie algebra. The algebra found is of the type of algebras found in studies leading towards noncommutative geometry approaches to physical problems.
Canonical Treatment Of Regular Lagrangians With Holonomic Constraints As Singular Systems, Eqab M. Rabei
Canonical Treatment Of Regular Lagrangians With Holonomic Constraints As Singular Systems, Eqab M. Rabei
Turkish Journal of Physics
Regular Lagrangians with holomonic constraints are treated as singular systems using the canonical method. The Lagrange multipliers are introduced as generalized coordinates. The regular Lagrangians are extended to be singular and the Hamiltonian formulation is obtained. The equations of motion are written as total differential equations in terms of the time t and the Lagrange multipliers. It is also shown that Lagrange multipliers can be determined from the integrability conditions.
Magnetisation In Two-Dimensions, Bengü Kaplan
Magnetisation In Two-Dimensions, Bengü Kaplan
Turkish Journal of Physics
We discuss the magnetisation deviation in two-dimensions (2d) for an iron film for which the anisotropy is much smaller and hence the magnetisation is a stronger function of temperature. The magnetisation deviation can be adequately described by an RPA (random phase approximation) approach. Our results fit the experimental data at high fields and hence can be used to estimate the value of the effective exchange interaction (J_{2d}) for monolayer (ML) films.
Low-Magnetic Field Microwave Absorption In Superconductors And Conducting Polymers, I. L. Khairullin, P. K. Khabibullaev, V. Yu. Sokolov, A. A. Zakhidov
Low-Magnetic Field Microwave Absorption In Superconductors And Conducting Polymers, I. L. Khairullin, P. K. Khabibullaev, V. Yu. Sokolov, A. A. Zakhidov
Turkish Journal of Physics
Low-magnetic field microwave absorption (MA) in superconductors and conducting polymers is analysed in a low-field signal (LFS) version of the MA detecting method. The temperature dependences, hysteretic benavior and other properties of a LFS are compared in superconducting versus non-superonducting systems. Spin selective hopping processes between polarons and bipolarons is proposed to be one of the possible mechanisms of a LFS in non-degenarate conducting polymers.
Cover And Contents
Turkish Journal of Veterinary & Animal Sciences
No abstract provided.
The Effect Of Different Seed Rates On Yield And Yield Components Of Two Soybean ( Glycine Max. (L.) Merill) Varieties In Kahramanmaras Conditions, H. Ahmet Yilmaz
The Effect Of Different Seed Rates On Yield And Yield Components Of Two Soybean ( Glycine Max. (L.) Merill) Varieties In Kahramanmaras Conditions, H. Ahmet Yilmaz
Turkish Journal of Agriculture and Forestry
This study was carried out in Kahramanmaras ecological condition in 1994 and 1995. In this study soybean cv "P. 9442" and "AP 240" were planted at 50, 60 and 70 cm row spaces, and 3, 5 and 7 cm intrarow seed spaces, and the effects of sowing densities on yield and yield components were investigated. The effects of row spaces on numberof branches per plant and, 100 seed weigth, yield per da, and kernel ratio, were significant in both years , on plant height, branche number per plant and yield per da were significant in both years, on branch number …
Genetic Analysis And Gliadin Banding Patterns In Some Bread Wheat Varieties Grown In Turkey And Their Hybrids, Si̇bel Keski̇n, Sevi̇nç Asal, Orhan Kavuncu
Genetic Analysis And Gliadin Banding Patterns In Some Bread Wheat Varieties Grown In Turkey And Their Hybrids, Si̇bel Keski̇n, Sevi̇nç Asal, Orhan Kavuncu
Turkish Journal of Agriculture and Forestry
In this study, 20 individual kernels of "Gün 91", "Kırkpınar 79", "Atay 85", "Kıraç 66", "Bolal 2973", "Bezostaya 1" and "Gerek 79" bread wheat cultivars that are grown in Turkey and their half diallel F 1 hybrids were analysed using polyacylamide gel electrophoresis (PAGE) in order to determine gliadin band patterns and to show homogeneity and/or heterogeneity. Result of electrophoretic analysis showed that there is a detectable variation within these cultivars and amongst their hybrids. However the heterogeneity in hybrids was larger than the one in parents. Some bands found in hybrids but not in parents and vice versa have …
Effect Of Exterior Exposure On The Hadrness Of Varnishes Coating, Ramazan Özen, Abdullah Sönmez
Effect Of Exterior Exposure On The Hadrness Of Varnishes Coating, Ramazan Özen, Abdullah Sönmez
Turkish Journal of Agriculture and Forestry
Wooden materials have been used for decoration and building element both indoors and outdoors. One of the most important problem in wood finishing has been that naturel appearence of wood and varnish coating couldn't be preserved sufficiently against outdoor effects. In this research, cellulosic, synthetic, acid catalyzed and polyurethan varnishes and synthetic opaque white paint was examined by using on the beech (Fagus orientalis L.), pine (Pinus silvestris L.), oak (Quercus petreae L.), castanea (Castanea sativa M.) wood panels. Experiments was conducted in Ankara. Beginning in 1993 a total of five experimental finishes on the four different panels have been …
A Contribution To Exotic Plants Of Turkey: Sicyos Angulatus L., Sali̇h Terzi̇oğlu, Rahi̇m Anşi̇n
A Contribution To Exotic Plants Of Turkey: Sicyos Angulatus L., Sali̇h Terzi̇oğlu, Rahi̇m Anşi̇n
Turkish Journal of Agriculture and Forestry
In this study, a contribution has been made to distribution areas for Sicyos angulatusL. as A7 Trabzon: Yomra, A8 Trabzon Araklı, Of and Çaykara in addition to the A8 Artvin: Borçka have been determined previously. Detailed Morphological measurements were presented. Also, key of genus of Cucurbitaceaehas been ordered and given in English.
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 …
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.
Effect Of Neutron Irradiation On Carriers Removel Rates In N-Si, M.S. Yunusov, M. Karimov, B.L. Oksengendler, M.A. Zhalelov
Effect Of Neutron Irradiation On Carriers Removel Rates In N-Si, M.S. Yunusov, M. Karimov, B.L. Oksengendler, M.A. Zhalelov
Turkish Journal of Physics
Carrier removal rate in $n-Si \langle P, Rh \rangle$ with different doping rhodium concentrations were investigated under fast neutrons irradiation. It is shown that the rate of carrier removal increases with phosphorus atom concentration but decreases with rhodium atom concentration. Theoretical analysis on the base of kinetic equations has shown that standard scheme of quasichemical reactions taking into account the interaction between rhodium atoms, vacancies and self interstitial atoms could not explain the results of experiment. Therefore a new model based on the use of radiation to increase the barrier between regions of fluctuating impurity concentration has been proposed.