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Glazov M.M.,RAS Ioffe Physical - Technical Institute | Sherman E.Y.,University of the Basque Country | Sherman E.Y.,Ikerbasque | Dugaev V.K.,Rzeszw University of Technology | Dugaev V.K.,University of Lisbon
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2010

A review of physical processes related to disorder in spinorbit coupling in two-dimensional electron gas is presented. We begin with the analysis of the sources of the randomness in the spinorbit coupling in semiconductor structures and establish the corresponding Hamiltonian. We demonstrate that in multiple quantum wells electronelectron interaction is a source of a time-dependent randomness in the spinorbit coupling, additional to that provided by the static disorder. The spin relaxation of free and localized in quantum dots electrons, memory effects and spin relaxation enhancement in magnetic field, and spin manipulation and spin current injection by external electric fields in the structures where the spinorbit coupling is random, are considered. In addition, we study spin relaxation in single-layer graphene, which provides an excellent example of a system with disordered spinorbit coupling. © 2010 Elsevier B.V. All rights reserved.


Dziok J.,University of Rzeszw | Raina R.K.,Mp University Of Agriculture And Technology | Sokol J.,Rzeszw University of Technology
Computers and Mathematics with Applications | Year: 2011

This paper investigates some basic geometric properties for the class KSL of functions f analytic in the open unit disc Δ=z:|z|<1 (which is related to a shell-like curve and associated with Fibonacci numbers) satisfying the condition that f(0)=0,f′(0)=1andzf″(z) f′(z)≺τz+2τ2z21-τz- τ2z2(z∈Δ), where, the number τ=(1-5)2 is such that |τ| fulfils the golden section of the segment [0,1]. Some relevant remarks and useful connections of the main results are also pointed out. © 2011 Elsevier Ltd. All rights reserved.


Bogusz P.,Rzeszw University of Technology | Korkosz M.,Rzeszw University of Technology | Prokop J.,Rzeszw University of Technology
Proceedings - ISIE 2011: 2011 IEEE International Symposium on Industrial Electronics | Year: 2011

Construction of the Switched Reluctance Motor (SRM) developed by the authors and designated as a driving system for the food processor, is presented in this paper. The 6/4 design motor is of asymmetric stator construction. Results of simulation calculations are presented in a form of static characteristics, as well as current and torque waveforms. An analysis of how the air gap thickness, the width of stator poles and rotor teeth influence motor performance. Laboratory test results obtained on the actual prototype motor are also given. © 2011 IEEE.

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