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Rashich A.,Peter The Great St Petersburg Polytechnical University | Fadeev D.,Peter The Great St Petersburg Polytechnical University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016

In this paper BER performance of FFT-based trellis receiver for multicarrier signals with spectrally efficient frequency division multiplexing (SEFDM) is evaluated taking into account the impact of nonlinear distortions caused by nonlinear power amplifier (PA). Values of input power back-off (IBO) corresponding to the best BER performance are obtained. The energy efficiency is quantified with energy loss with respect to the system with ideal linear PA. The energy efficiency of considered system is compared with the one of SEFDM system with detection algorithm based on decision diagram and no coding. © Springer International Publishing AG 2016.


Tsybin O.,Peter The Great St Petersburg Polytechnical University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

Mechanisms of a fast energetic excitation in a nano-device with an embedded molecular film are discussed herein. Excited intermolecular transport of protons, electrons and other quantum carriers could create communication channels inside a molecular network. We suggest that such channels could be analyzed by means of electron capture dissociation reactions of a protonated peptide, protein or a DNA to reveal the intramolecular pathways of mobile carrier motion in an isolated dehydrated molecule. In general, initial processing stage in a nano-device with a molecular film consists of a target direct activation followed by energy transport from target excitations into a surface molecular film which produces an indirect activation. We analyzed selected indirect molecular excitations produced by a metal or a semiconductor target directly activated by means of a radiofrequency electromagnetic field. Further processing stage after the activation consists of molecular relaxation and transportation phenomena providing nano-electromagnetic field, molecular flow, and communication. © Springer International Publishing Switzerland 2015.


Agafonova N.D.,Peter The Great St Petersburg Polytechnical University | Paramonova I.L.,Peter The Great St Petersburg Polytechnical University
Journal of Engineering Physics and Thermophysics | Year: 2016

The formulas for calculating the characteristic drop size for the mean Sauter diameter have been compared. The question on various forms of the size distribution of drops has been considered. To substantiate the applicability of the compared formulas for calculating the thermohydrodynamics in the circuits of nuclear power plants, experimental data on the wall temperature in a dispersed flow have been used. It has been shown that the Sauter diameter values calculated using the wall temperature in the supercritical region are in good agreement with sparse direct measurements of the drop size in steam–water flows. The drop sizes calculated using the tested formulas obtained for two-component gas–liquid flows or for single-component flows of coolants (various kinds of freons) and liquefied nitrogen turned out to be much lower. It has been shown that it is necessary to recalculate the numerical coefficients in the considered formulas in using them for steam–water flows. © 2016 Springer Science+Business Media New York


Fadeev D.K.,Peter The Great St Petersburg Polytechnical University | Rashich A.V.,Peter The Great St Petersburg Polytechnical University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

In this paper the impact of nonlinear distortions caused by nonlinear power amplifier (PA) is evaluated for BPSK and QPSK Spectrally Efficient Frequency Division Multiplexing (SEFDM) signals. System performance depends on input power back-off (IBO) and SEFDM parameters, such as modulation scheme, frequency spacing between subcarriers and total number of subcarriers. Performance is quantified with total degradation (TD), defined as the sum (in decibels) of the IBO and the increment Δ in the ratio Eb/No required to maintain a given bit error rate (BER) with respect to the situation of perfectly linear PA. IBO corresponding to minimum TD is obtained. © Springer International Publishing Switzerland 2015.


Shevkunov S.V.,Peter The Great St Petersburg Polytechnical University
Colloid Journal | Year: 2016

Computer simulation has been employed to study the effect of a confined space of a planar model pore with structureless hydrophobic walls on the hydration of Na+Cl– ion pairs in water vapor at room temperature. A detailed many-body model of intermolecular interactions has been used. The model has been calibrated relative to experimental data on the free energy and enthalpy of the initial reactions of water molecule attachment to ions and the results of quantum-chemical calculations of the geometry and energy of Na+Cl– (H2O)N clusters in stable configurations, as well as spectroscopic data on Na+Cl– dimer vibration frequencies. The free energy and work of hydration, as well as the adsorption curve, have been calculated from the first principles by the bicanonical statistical ensemble method. The dependence of hydration shell size on interionic distance has been calculated by the method of compensation potential. The transition between the states of a contact (CIP) and a solvent-separated ion pair (SSIP) has been reproduced under the conditions of a nanopore. The influence of the pore increases with the hydration shell size and leads to the stabilization of the SSIP states, which are only conditionally stable in bulk water vapor. © 2016, Pleiades Publishing, Ltd.


Sheskin E.B.,JSC STS UPS | Evdokunin G.A.,Peter The Great St Petersburg Polytechnical University
Power Technology and Engineering | Year: 2016

The problem of disconnecting high-voltage cable lines with shunt reactors by SF6 circuit breakers is discussed. In these schemes it is possible to have a significant aperiodic component of the circuit breaker current that can prevent opening of the breaker. The authors propose methods for application to cable transmission lines which they believe will be optimal for ensuring normal disconnects. © 2016, Springer Science+Business Media New York.


Shevkunov S.V.,Peter The Great St Petersburg Polytechnical University
Russian Journal of Physical Chemistry A | Year: 2016

The hydration of a single-charged chloride anion Cl- in a model plane nanopore with structureless hydrophilic walls in water vapor at room temperature is simulated using the Monte Carlo method. It is established that the adsorption of a fraction of associate molecules Cl-(H2O)N on the walls enhances its thermodynamic stability and simulates the hydration of the ion at low vapor pressures. It is shown that a second stability crisis forms on the curve of the hydration work function in the mode of weak wall hydrophilicity. © 2016, Pleiades Publishing, Ltd.


Konakov V.G.,Saint Petersburg State University | Kharitonov S.N.,Saint Petersburg State University | Kurapova O.Y.,Saint Petersburg State University | Archakov I.Y.,Peter The Great St Petersburg Polytechnical University
Journal of Solid State Electrochemistry | Year: 2016

The paper reports the development of high temperature in situ fully solid electrochemical sensor for sulfur-containing gases monitoring. The sensor is based on Ag+β”-Al2O3 membrane with Ag2S or Ag2SO4 layer on its surface. Silver beta alumina was manufactured by high temperature ion exchange technique in AgNO3 melt. The original design of the in situ sensor was developed. Three types of galvanic cells were used for the investigation of electromotive force (EMF) response on SO2 partial pressure both in oxygen-free and oxygen-containing atmosphere in the temperature range 673–923 K. The data obtained was compared with following Nernst equations. The applicability of the sensor for in situ measurements in industrial processes is discussed. © 2016 Springer-Verlag Berlin Heidelberg


PubMed | D O Ott Research Institute Of Obstetrics, St Petersburg Institute Of Bioregulation And Gerontology and Peter The Great St Petersburg Polytechnical University
Type: Journal Article | Journal: Bulletin of experimental biology and medicine | Year: 2016

The effect peptides KE, KED, AED and AEDG on proliferation (Ki-67), regeneration and aging (CD98hc), apoptosis (caspase-3), and extracellular matrix remodeling (MMP-9) in skin fibroblasts during their aging in culture were studied by immunofluorescent confocal microscopy. All studied peptides inhibited MMP-9 synthesis that increases during aging of skin fibroblasts and enhanced the expression of Ki-67 and CD98hc that are less intensively synthesized during cell aging. Peptides AED and AEDG suppressed caspase-dependent apoptosis that increases during aging of cell cultures.


PubMed | Peter The Great St Petersburg Polytechnical University, Computer Science and CEWIT and British Columbia Institute of Technology
Type: Journal Article | Journal: Journal of bioinformatics and computational biology | Year: 2016

Gene network simulations are increasingly used to quantify mutual gene regulation in biological tissues. These are generally based on linear interactions between single-entity regulatory and target genes. Biological genes, by contrast, commonly have multiple, partially independent, cis-regulatory modules (CRMs) for regulator binding, and can produce variant transcription and translation products. We present a modeling framework to address some of the gene regulatory dynamics implied by this biological complexity. Spatial patterning of the hunchback (hb) gene in Drosophila development involves control by three CRMs producing two distinct mRNA transcripts. We use this example to develop a differential equations model for transcription which takes into account the cis-regulatory architecture of the gene. Potential regulatory interactions are screened by a genetic algorithms (GAs) approach and compared to biological expression data.

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