Time filter

Source Type

Tomsk, Russia

Tomsk Polytechnic University in Tomsk, Russia, is the oldest technical university in Russia east of the Urals. The university was founded in 1896 and opened in 1900 as the Tomsk Technological Institute. In 1923, the school was renamed the Siberian Technological Institute and in 1930, the institute was split into five divisions, three of which remained in Tomsk. In 1934, the three institutes in Tomsk reunited to form a new institute that would be named the Tomsk Polytechnic Institute. The university has more than 22,000 current students and has graduated more than 100,000 technical specialists. As of 2014 the rector was Petr S. Chubik. Wikipedia.

Galajinsky A.,Tomsk Polytechnic University
Nuclear Physics B | Year: 2010

Conformal many-body mechanics in Newton-Hooke spacetime is studied within the framework of the Lagrangian formalism. Global symmetries and Noether charges are given in a form convenient for analyzing the flat space limit. N = 2 superconformal extension is built and a new class on N = 2 models related to simple Lie algebras is presented. A decoupling similarity transformation on N = 2 quantum mechanics in Newton-Hooke spacetime is discussed. © 2010 Elsevier B.V. All rights reserved. Source

Galajinsky A.,Tomsk Polytechnic University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

(n+2)-dimensional Lorentzian spacetime, which admits irreducible Killing tensors of rank up to n, is constructed by applying the Eisenhart lift to the Calogero model. © 2012 American Physical Society. Source

Masterov I.,Tomsk Polytechnic University
Nuclear Physics B | Year: 2016

Ostrogradsky's method allows one to construct Hamiltonian formulation for a higher derivative system. An application of this approach to the Pais-Uhlenbeck oscillator yields the Hamiltonian which is unbounded from below. This leads to the ghost problem in quantum theory. In order to avoid this nasty feature, the technique previously developed in [7] is used to construct an alternative Hamiltonian formulation for the multidimensional Pais-Uhlenbeck oscillator of arbitrary even order with distinct frequencies of oscillation. This construction is also generalized to the case of an N = 2 supersymmetric Pais-Uhlenbeck oscillator. © 2015 The Author. Source

Vavilov V.P.,Tomsk Polytechnic University
NDT and E International | Year: 2015

The concept of "dynamic thermal tomography" (DTT) was suggested in the 1980s. At that time, there was a wave of interest in the tomographic analysis of materials by active thermal nondestructive testing (TNDT). Unlike particles and quanta of electromagnetic radiation, thermal energy propagates in solids by diffusion. Therefore, a purely geometrical approach, that is characteristic of computed X-ray tomography, is replaced in DTT with the analysis of the evolution of temperature versus time. DTT is based on the fact that, in one-sided TNDT, deeper material layers are characterized by longer time delays of the thermal response. The DTT algorithm is relatively stable when used in the inspection of certain materials. Thermal waves experience damping by amplitude and retardation in time. This limits the detection depth and produces certain artifacts that can be suppressed by thresholding maxigrams. DTT can also be considered as a specific way of data presentation that has proven to be useful in many practical cases, including surface and volumetric thermal stimulation of both metals and non-metals. Thermal tomograms appear similar to binary maps of defects, thus enabling more reliable defect detection in comparison to conventional IR thermograms. In this paper, a "reference-free" approach to DTT is proposed being based on some mathematical manipulations with a front-surface temperature response. Also, the possibility of using the DTT principles for processing the results of ultrasonic infrared thermography is demonstrated. © 2015 Elsevier Ltd. All rights reserved. Source

Karlovets D.V.,Tomsk Polytechnic University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012

Electrons carrying orbital angular momentum (OAM) have recently been discovered theoretically and obtained experimentally, which opens up possibilities for using them in high-energy physics. We consider such a twisted electron moving in the external field of a plane electromagnetic wave and study how this field influences the electron's OAM. Being motivated by the development of high-power lasers, we focus our attention on a classically strong-field regime for which e2A2̄/(me2c 4)≳1. It is shown that, along with the well-known "plane-wave" Volkov solution, the Dirac equation also has the "non-plane-wave" solutions, which possess OAM and spin-orbit coupling and generalize the free-electron's Bessel states. Motion of an electron with OAM in a circularly polarized laser wave reveals a twofold character: the wave-packet center moves along a classical helical trajectory with some quantum transverse broadening (due to OAM) existing even for a free electron. Using the twisted states, we calculate the electron's total angular momentum and predict its shift in the strong-field regime, which is analogous to the well-known shifts of the electron's momentum and mass (and to a less-known shift of its spin) in intense fields. Since the electron's effective angular momentum is conserved in a plane wave, as well as in some more general field configurations, we discuss several possibilities for accelerating nonrelativistic twisted electrons by using focused and combined electromagnetic fields. © 2012 American Physical Society. Source

Discover hidden collaborations