South Ural State University ) in Chelyabinsk is one of the largest educational institutions in Russia. It is among the top-ten of the Russian universities according to the state rating of the Ministry of Education and Science of the Russian Federation, and the largest in Russia in terms of the number of undergraduates.There are over 50 thousand students and more than 5 thousand faculty members and staff at the University, including 270 professors and 1020 associate professors. Among them are 4 academicians and 5 Corresponding Members of the Russian Academy of science, over 90 academicians of various public academies, 4 members of foreign academies. Wikipedia.
Martyushev E.V.,South Ural State University
Journal of Mathematical Imaging and Vision | Year: 2017
In two-view geometry, the essential matrix describes the relative position and orientation of two calibrated images. In three views, a similar role is assigned to the calibrated trifocal tensor. It is a particular case of the (uncalibrated) trifocal tensor, and thus it inherits all its properties but, due to the fewer degrees of freedom, satisfies a number of additional algebraic constraints. Some of them are described in this paper. More specifically, we define a new notion—the trifocal essential matrix. On the one hand, it is a generalization of the ordinary (bifocal) essential matrix, while, on the other hand, it is closely related to the calibrated trifocal tensor. We prove the two necessary and sufficient conditions that characterize the set of trifocal essential matrices. Based on these characterizations, we propose three necessary conditions on a calibrated trifocal tensor. They have the form of 15 quartic and 99 quintic polynomial equations. We show that in the practically significant real case the 15 quartic constraints are also sufficient. © 2017 Springer Science+Business Media New York
Degtyarev V.V.,New Millennium Building Systems LLC |
Degtyareva N.V.,South Ural State University
Thin-Walled Structures | Year: 2017
This paper presents results of a numerical parametric study on elastic shear buckling of cold-formed steel channels with flat slotted webs. The study was performed on finite element models developed in ANSYS and validated against test data. The effects of perforation pattern, channel flange width, flange lip length, and aspect ratio on the elastic shear buckling load were investigated on the models with realistic and test setup boundary conditions. Equations for predicting the elastic shear buckling load of slotted channels were developed. The equations account for the effects of the studied parameters on the elastic shear buckling load of cold-formed steel channels with flat slotted webs and showed a good agreement with the finite element analysis results. © 2017 Elsevier Ltd
Krasnikov V.S.,South Ural State University |
Mayer A.E.,Chelyabinsk State University |
Yalovets A.P.,South Ural State University
International Journal of Plasticity | Year: 2011
This paper focuses on the development of a plasticity model to describe high rate deformations of metals. Modeling of target mechanical response is performed in frames of continuum mechanics. Plastic flow is described as the result of an over barrier dislocation sliding in specific slip planes. Computations of shock wave propagation in fcc, bcc and hcp metals modeling in comparison with shock wave experiments are performed to verify the model. The model predicts yield strength increase on elastic precursor in aluminum monocrystal and titanium of high purity at high temperatures. The action on a copper target of the electron beams with energy density (the total energy incident on an unit area during an irradiation pulse) 8.6 J cm-2 and varied pulse duration has been investigated. At the considered irradiation regime the target remains in a solid state (maximal temperature is 710 K) and shear stresses can reach values of about 0.72 GPa. Depth distribution of dislocation density after irradiation has a maximum that is localized on a distance of 10 μm from the irradiated surface and the maximum dislocation density is about 6 × 109 cm-2 in the target. The shortening of the exposure time to 1 ns leads to the increase of the dislocation density. Further reduction of exposure time has a weak effect on the dislocation density because the shear stresses reach a limit. © 2011 Elsevier Ltd. All rights reserved.
Shchurov I.A.,South Ural State University
International Journal of Advanced Manufacturing Technology | Year: 2011
This paper presents a new calculation procedure of the virtual pitch thread diameter using the cloud of points from coordinate measuring machines (CMM). The procedure involves scanning of thread profiles using a CMM, calculation of points sets belonging to the left and right thread flanks, next determination of the thread profile which belongs to the adjoining helical surface. Its parameters guarantee the required diameter calculation. Estimation of this diameter comparing it with the standard one measured by CMM "Lapik KIM- 1000" and the theoretical maximum pitch thread diameter shows that this approach gives a reliable result.
Elyukhina I.,South Ural State University
Rheologica Acta | Year: 2011
The general algorithm of calculations for oscillating-cup viscometry of fluids with viscous, elastic and plastic components is developed for damped and forced modes. The working equations efficient for practical applications are presented and related problems of data processing are analyzed. The case of forced oscillations of viscometer filled with rheostable fluids is treated in detail. © 2011 Springer-Verlag.
Garbuzenko D.V.,South Ural State University
World Journal of Gastroenterology | Year: 2015
Severe complications of liver cirrhosis are mostly related to portal hypertension. At the base of the pathogenesis of portal hypertension is the increase in hepatic vascular resistance to portal blood flow with subsequent development of hyperdynamic circulation, which, despite of the formation of collateral circulation, promotes progression of portal hypertension. An important role in its pathogenesis is played by the rearrangement of vascular bed and angiogenesis. As a result, strategic directions of the therapy of portal hypertension under liver cirrhosis include selectively decreasing hepatic vascular resistance with preserving or increasing portal blood flow, and correcting hyperdynamic circulation and pathological angiogenesis, while striving to reduce the hepatic venous pressure gradient to less than 12 mmHg or 20% of the baseline. Over the last years, substantial progress in understanding the pathophysiological mechanisms of hemodynamic disorders under liver cirrhosis has resulted in the development of new drugs for their correction. Although the majority of them have so far been investigated only in animal experiments, as well as at the molecular and cellular level, it might be expected that the introduction of the new methods in clinical practice will increase the efficacy of the conservative approach to the prophylaxis and treatment of portal hypertension complications. The purpose of the review is to describe the known methods of portal hypertension pharmacotherapy and discuss the drugs that may affect the basic pathogenetic mechanisms of its development. © The Author(s) 2015. Published by Baishideng Publishing Group Inc. All rights reserved.
Podoshvedov S.A.,South Ural State University
Optics Communications | Year: 2012
We propose an approach with displaced states to use it for rotations of base coherent states and squeezed coherent states. Our approach is based on representation of the coherent states in free-traveling fields in terms of displaced number states with arbitrary amplitude of displacement. Two optical schemes are developed for construction of Hadamard gate for the base states. One of the optical schemes is based on alternation of photon additions and displacement operators (in general case, N-photon additions and N-1-displacements are required) to generate displaced squeezed even/odd superposition of coherent states (SCSs) with high fidelity in dependency on type (computational zero or one) of the base input state. Another optical scheme uses two-photon subtracted squeezed coherent states to approximate outcome of the Hadamard gate for the base squeezed coherent states. Output states approximate with high fidelity either even squeezed SCS or odd SCS shifted relative to each other by some value. It enables to adjust the optical scheme for construction of the Hadamard gate being mainframe element for quantum computation with basic squeezed coherent states. © 2012 Elsevier B.V. All rights reserved.
Podoshvedov S.A.,South Ural State University
Optics Communications | Year: 2013
In quantum computing with base either coherent or squeezed coherent states, information is encoded into coherent states with opposite amplitudes. To exploit the base states in quantum computation, we need arbitrary qubit rotations plus a two-qubit gate such as controlled-Z gate to simulate any multiqubit unitary transformations. We develop an approach to realize single qubit operations with the base squeezed coherent states. The optical setup requires a resource of the base squeezed coherent states, unbalanced beam splitter whose transmittance tends to unity and photon counters in auxiliary modes. A successful two-photon subtraction from transmitted beam is heralded by two-photon click in auxiliary modes where tiny part of the initial beam is detected. The thrust of the method is that it achieves a high fidelity without photodetectors with a high efficiency or a single-photon resolution. We observe that there is wide diapason of values of the parameters that provide performance of single qubit operations with the base states. The problem is resolved in Wigner representation to take into account imperfections of the optical devices. © 2012 Elsevier B.V. All rights reserved.
Prokudina L.A.,South Ural State University
Journal of Experimental and Theoretical Physics | Year: 2014
A mathematical model is presented for the state of a free surface of a thin fluid layer (a fluid film) in heat–mass_exchange processes of condensation and evaporation. The wave motion of a fluid film is stud-ied under inhomogeneous surface tension. Nonlinear development of perturbations belonging to a continu-ous band of wave numbers on the surface of a thin fluid layer is investigated within the framework of a non- linear parabolic equation. It is shown that wave packets with carrier wave lying near the harmonic of maxi-mum increment become self_ordered; as a result, a monochromatic wave is generated on the surface of the fluid film. When a wave packet is generated in the neighborhood of the neutral stability curve, one can observe a phenomenon of directed energy transfer to the waves in the neighborhood of the harmonic of maximum increment. © Pleiades Publishing, Inc., 2014.
Podoshvedov S.A.,South Ural State University
Quantum Information Processing | Year: 2012
We propose an approach with displaced states that can be used for rotations of coherent states.Our approach is based on representation of arbitrary one-mode pure state in free-travelling fields, in particular superposition of coherent states (SCSs), in terms of displaced number states with arbitrary amplitude of displacement. Optical scheme is developed for construction of displacing Hadamard gate for the coherent states. It is based on alternation of single photon additions and displacement operators (in general case, N-singe photon additions and N-1-displacements are required) with seed coherent state to generate both even and odd displaced squeezed SCSs regardless of number of used photon additions. The optical scheme is sensitive to the seed coherent state provided that other parameters of the scheme are invariable. Output states approximate with high fidelity either even squeezed SCS or odd SCS shifted relative each other by some value. It enables to construct local rotations for coherent states, in particular, Hadamard gate being mainframe element for quantum computation with coherent states. The effects deteriorating quality of output states are considered. © Springer Science+Business Media, LLC 2011.