2304-9782, 2618-8686, 2405-7223
St. Petersburg Polytechnic University Journal. Physics and Mathematics
1
189
2014
RAR
RUS
9-15
Gorobei
Natalia
Peter the Great St. Petersburg Polytechnic University
n.gorobey@mail.ru
Luk'yanenko
Alexander
Peter the Great St. Petersburg Polytechnic University
alex.lukyan@rambler.ru
On the energy balance in the thermoelastic effect
The energy balance in the thermoelastic effect is analysed in the framework of the mechanically deformed ensemble of anharmonic oscillators. As the result, two aspects of mechanical loading - the macroscopic deformation of a sample, with corresponding addition to the energy balance (the mechanical work), and the vibration energy of oscillators change at the microscopic level, are separated. Between these two parts of the internal energy of the sample the exchange in the thermo-elastic effect takes place. The low temperature limit in which the vibration energy reduces to the energy of zero vibrations is also considered.
538.9(075)
energy
thermo-elastic effect
energy balance
deformation
anharmonic oscillator
https://physmath.spbstu.ru/article/2014.23.1/
01ph_1_2014edit.9_15.pdf
RAR
RUS
16-25
Arefyev
Konstantin
Hrushchenko
Alexander
hrushenko@mail.ru
The calculation of oxygen mass exchange in human lungs
The article considers the impact of the diffusion capacity of the lungs to process oxygen transfer from the gas phase of the alveoli into the blood capillaries of the lungs. The main transport of oxygen in the blood takes place in a bound state with the hemoglobin of red blood cells. Therefore, the diffusion capacity of the lungs to transport gases other than diffusion through tissue affects the rate of reaction of oxygen with hemoglobin and red blood cell membrane permeability. The dependence of the reaction rate of oxygen on hemoglobin oxygen tension is analyzed using various literary sources. Using a mathematical model of the lungs and experimental data taken from the literature the rate of oxygen reaction with hemoglobin was evaluated. Numerical results when compared with the experimental data showed a good result.
533.15: 612.22
diffusion capacity
oxygen reaction rate with hemoglobin
permeability of the erythrocytemembrane
oxygen transfer from gas phase into blood
https://physmath.spbstu.ru/article/2014.23.2/
02ph_1_2014edit.16_25.pdf
RAR
RUS
26-34
Lebedeva
Olga
Volgograd State University
lebedeva_os@volsu.ru
The influence of the stretching and compression deformations on the piezoresistance of the carbon nanotubes and graphene nanoribbons
In this article the influence of the stretching and compression on the conducting properties of carbon nanoparticles (nanotubes, nanoribbons) accounting the changes in the transverse dimensions of the sample is studied theoretically. The analytical calculation of piezoresistive constants of carbon nanoparticles with the account of transverse strain was carried out. It is shown that the elastoconductivity tensor of metallic nanotubes is independent of its diameter. The monotonic increase in the longitudinal component of the tensor with the increasing its diameters of semiconducting nanotubes was obtained. It is shown that increasing or decreasing of the piezoresistive constant of semiconducting nanotubes with the relative tension or compression strain.The results are compared with the literature data. A physical justification of the observed dependence was described.nanoparticles (nanotubes, nanoribbons) accounting the changes in the transverse dimensions of the sample is studied theoretically. The analytical calculation of piezoresistive constants of carbon nanoparticles with the account of transverse strain was carried out. It is shown that the elastoconductivity tensor of metallic nanotubes is independent of its diameter. The monotonic increase in the longitudinal component of the tensor with the increasing its diameters of semiconducting nanotubes was obtained. It is shown that increasing or decreasing of the piezoresistive constant of semiconducting nanotubes with the relative tension or compression strain.The results are compared with the literature data. A physical justification of the observed dependence was described.
544.225.22+25; 544.22.022.384.3; 539.371
Huckel approximation
Hubbard’s model
Green’s function method
elastoconductivity tensor
https://physmath.spbstu.ru/article/2014.23.3/
03ph_1_2014edit.26_34.pdf
RAR
RUS
35-38
Kanunnikova
Elena
postgr@list.ru
Analytic-numerical method to solve 3D exterior boundary problems for elliptic equations
The paper considers analytic-numerical method to solve 3D exterior problems for elliptic equations under Dirichlet and Neumann boundary conditions in half-space. The solution algorithm is concerned
519.632
exterior boundary problems
3D half-space
elliptic equation
https://physmath.spbstu.ru/article/2014.23.4/
04ph_1_2014edit.35_38.pdf
RAR
RUS
39-47
Kharaldin
Ivan
ikharaldin@gmail.com
Pakhotin
Vladimir
v.pakhotin@mail.ioffe.ru
Zakrevskii
Vladimir
v.zakrevsky@mail.ioffe.ru
Some features of measurement of breakdown current through dielectrics
Some different circuits for measurement of breakdown current through dielectric films have been analyzed and a notion for shunting discharge current in a capacitor measuring cell flowing along the breakdown canal was introduced. A circuitry for measurement of breakdown current was put forward. It permits one to work out the shunting current and the breakdown canal resistance using the results of measurements of pulse parameters of breakdown current.
537.529:621.317
electrical breakdown
breakdown current
measuring procedure
pulse parameter
shunting current
https://physmath.spbstu.ru/article/2014.23.5/
05ph_1_2014edit.39_47.pdf
RAR
RUS
48-54
Kuptsova
Galina
Golovkov
Oleg
Stepanov
Vladimir
Ryazan State University named for S.A.Yesenin
vl.stepanov@365.rsu.edu.ru
Influence of the extent of uniform broadening of an amplification line on the generation spectrum of YAG : Nd laser
The theoretical investigation given in the paper is directed towards the elucidation of the influence ofthe extent of uniform broadening of an amplification line on the generation spectrum of YAG : Nd laseroperating in the modes of the one-wavelength (1064,2 nm) and two-wavelength (1064,2 nm and 1061,5 nm)generations. The results obtained are compared with another ones presented in published literature.
621.373.826
wavelength
YAG: Nd laser
generation spectrum
laser mode
uniform broadening extent
set of equations of Tang-Statz-Demars
https://physmath.spbstu.ru/article/2014.23.6/
06ph_1_2014edit.48_54.pdf
RAR
RUS
55-60
Kuptsova
Galina
Golovkov
Oleg
Stepanov
Vladimir
Ryazan State University named for S.A.Yesenin
vl.stepanov@365.rsu.edu.ru
The rate consideration of relaxation transitions between sublevels of a multiplet in the generation spectrum of YAG:Nd-laser
The two alternative forms of the Tang - Statz - DeMars system of equations are presented in the paper. The spectra of the multimode generation of YAG: Nd +3-laser are calculated assuming the Boltzmann distribution over the sublevels of the 4F3/2 multiplet and a specific rate of cross-relaxation transitions between those sublevels. The results obtained are compared with experimental data.
621.373.826
YAG: Nd-laser
Boltzmann distribution
generation spectrum
Tang-Statz-Demars system ofequations
multiplet sublevels
https://physmath.spbstu.ru/article/2014.23.7/
07ph_1_2014edit.55_60.pdf
RAR
RUS
61-66
Krinitsky
Yakov
Garcia Sarate Maria Alejandro
Petrov
Victor
Khomenko
Anatoly
Light pressure detection by two-wave mixing in the photorefractive BaTiO3:Co crystal
The paper studies the high-sensitive detection of light radiation pressure using an adaptive interferometer based on photorefractive 45○-cut BaTiO3 : Co crystal. For small phase modulation measurement the authors employed a polarization filtering, which ensured the linear regime of signal detection in the photorefractive crystal with nonlocal response. It was demonstrated that the proposed method of light pressure measurement could be used as a broadband photodetector. It was experimentally found that the sensitivity was 2 µW in the wavelength range from 488 to 1600 nm.
535.41.111
adaptive holografic interferometer
light pressure
two-wavemixing
photorefractive crystal
high-sensitive detection
broadband photodetector
https://physmath.spbstu.ru/article/2014.23.8/
08ph_1_2014edit.61_66.pdf
RAR
RUS
67-78
Andronov
Alexander
andronov@rphf.spbstu.ru
Secondary electron emission at very low electron energy
A detailed review of experimental and theoretical studies of secondary electronemission (SEE) at low electron energies performed in the past has been given in this paper. It is shown that some present-day authors’ statement on increase of the SEE yield up to unity while the primary electron energy tends to zero does not have sufficient theoretical justification and is inconsistent with the numerous experimental data obtained for various materials.
537.533.9
secondary electron emission
thermionic emission
low primary energies
electron reflection from potential barrier
contact potential difference
https://physmath.spbstu.ru/article/2014.23.9/
09ph_1_2014edit.67_78.pdf
RAR
RUS
79-90
7006214225
0000-0001-7006-6951
Bezprozvanny
Ilya
UT Southwestern Med Ctr, Dept Physiol
mnlabspb@gmail.com
Dallas, USA
Popugaeva
Еlena
lena.popugaeva@gmail.com
Vlasova
Olga
Peter the Great St. Petersburg Polytechnic University
olvlasova@yandex.ru
The role of intracellular calcium in the development of Alzheimer disease pathogenesis
This article is a review and contains a brief description of the current state of research in the field of AD. The special attention is paid to the calcium hypothesis of AD, which is getting more popular and is an alternative hypothesis in relation to the dominant amyloid hypothesis of AD. The assumption of possible pathological pathway that takes place in AD is made basing on published and preliminary data.
612.82
Alzheimer disease
calcium
dendritic spine
synapse
two-photon microscopy
https://physmath.spbstu.ru/article/2014.23.10/
10ph_1_2014edit.79_90.pdf
RAR
RUS
91-100
Bezrukova
Alexandra
bezr@pb1097.spb.edu
Vlasova
Olga
Peter the Great St. Petersburg Polytechnic University
olvlasova@yandex.ru
Plotnikova
Polina
plopolina@yandex.ru
Algorithm of realization of the experimental optical parametric methods for biological disperse systems analysis
The article is devoted to the development and practical testing of the experimental and parametric optical methods for determining and comparing of liquid biological disperse systems on the basis of multiparametric optical analysis.
545.3;577.112.7
multiparametric analysis
optical methods
biological dispersion
https://physmath.spbstu.ru/article/2014.23.11/
11ph_1_2014edit.91_100.pdf
RAR
RUS
101-107
Khodorkovskii
Mikhail
Pobegalov
Georgiy
Vedyaykin
Alexey
Smirnov
Sergey
Sabantsev
Anton
Fedechkin
Stanislav
Characterisation of villin domain 6 calcium-binding properties
Using intrinsic protein fluorescence spectroscopy actin-regulating protein villin domain 6 calcium-binding properties were characterized. Acquired data suggests the presence of calcium-binding site in villindomain 6. The affinity of this calcium-binding site was estimated to be 32 µM, which suggested that the domain could be responsible for physiological transition of villin from bundling to severing actin filaments in response to the increase of intercellular calcium concentration.
577.322.7
villin
intrinsic protein fluorescence
cytoskeleton
modular proteins
https://physmath.spbstu.ru/article/2014.23.12/
12ph_1_2014edit.101_107.pdf
RAR
RUS
108-117
Kotov
Dmitry
Peter the Great St. Petersburg Polytechnic University
dmitriy.kotov@gmail.com
Ivanishchev
Dmitry
Ivanov
Alexey
alexey.ivanov86@gmail.com
K* and ω-mesons production in d + Au collisions at 200 GeV
Invariant transverse momentum spectra obtained for K*- and ω- mesons in d + Au collisions at 200 GeV have been presented. Comparison of the obtained results with existing measurements for π0-, Ks-, η-, η'- and φ-mesons have been made. The systematic study for light mesons production in central d + Au collisions have been carried out.
536.421
nuclei collisions
mesons
production
light quarks
analysis
https://physmath.spbstu.ru/article/2014.23.13/
13ph_1_2014edit.108_117.pdf
RAR
RUS
118-123
Petrichenko
Mikhail
Peter the Great St. Petersburg Polytechnic University
fonpetrich@mail.ru
Russia, 195251, St.Petersburg, Polytechnicheskaya, 29
Serov
Dmitry
dimusum@yandex.ru
Complete and incomplete additive doubling variables in linear systems with constant coefficients
Differential equations and their systems, not associated with any of the variational problems have been put forward to transform up to Hamiltonian form and immerse their solutions into a bundle of extremities. For small momenta the doubled system of the equations corresponds closely with the original one but for the equations in variations.
Totally or partly additive doubled system of linear equations with constant coefficients has a Hamilton structure. For Jordan cells in the matrix of coefficients of the system complete and partial doubling correspond closely, with an accuracy up to a shift operator, which is representable in the basis of its own and associated vectors of a nilpotent matrix.
517.2
differential equation
system of differential equations
Jordan matrix
complete
algebraic and spectral multiplicity
https://physmath.spbstu.ru/article/2014.23.14/
14ph_1_2014edit.118_123.pdf
RAR
RUS
124-135
Kondrashkov
Anatoly
ankon69@mail.ru
Pichugin
Yuri
Saint-Petersburg State University of Aerospace Instrumentation
yury-pichugin@mail.ru
Russia, 190000, St. Petersburg, Bolshaya Morskaya St., 61
On the identification and statistical testing stability of the Volterra model
Some aspects of the Volterra model are considered in the paper. The emphasis is both on the determination of solution stability area in the space of model parameters and on statistical testing of stability.
517.968.22
Volterra model
identification
stability
statistical testing
https://physmath.spbstu.ru/article/2014.23.15/
15ph_1_2014edit.124_135.pdf
RAR
RUS
136-143
Ulanov
Petr
ulanovpn@gmail.com
Rykshin
Alexei
alexey-r@yandex.ru
Zatsepin
Pavel
zpm@phys.asu.ru
The modeling of a short electromagnetic pulse scattering by dual layers structure using wavelet transform
In the paper the problem of a short electromagnetic pulse scattering by dual dielectric layers structure has been considered. An incident field was generated by infinitely thread-like source of electric or magnetic current located parallel to the boundaries of layers. The solution was written through the Fourier transform with respect to the spatial coordinates and wavelet transform with respect to the time coordinate. Electromagnetic fields characteristics within the given structure and in the surrounding space were studied.
537.86
wavelet transform
pulse
scattering
two-layer structure
https://physmath.spbstu.ru/article/2014.23.16/
16ph_1_2014edit.136_143.pdf
RAR
RUS
144-149
Golubev
Anatoliy
agg300@mail.ru
Smirnov
Aleksey
smalex77@mail.ru
The calculation of a tolerable noise level for the receiving sectionin the underwater acoustic unit containing an antenna with fibre-optic hydrophones
The dynamic range of the section for signals pre-processing in the underwater acoustic unit is conditioned by hydrophones sensitivity of the receiving antenna and by the internal noise level of operative assemblies composing the section. When we use a receiving antenna with interferometric fiber-optic hydrophones in that complement, optical and digital components are parts of the section. Our paper focuses on the calculation technique to get tolerable internal noise level reduced to the hydrophone input value. The technique is concerned with the underwater-acoustic unit containing receiving antenna with interferometric fiber-optic hydrophones.
623?983
interferometric fiber-optic hydrophone
hydrophone sensitivity
dynamic range
internal noise
analogue-digital converter
spatial processing
https://physmath.spbstu.ru/article/2014.23.17/
17ph_1_2014edit.144_149.pdf
RAR
RUS
150-156
Golubev
Anatoliy
agg300@mail.ru
Molchanov
Pavel
pasha@kgfi.ru
Estimation algorithms for impulse response of multibeam communication channel with transformation of the working frequency band
In transmission messages, the prediction about the form of every information signal, as a rule, is carried out using response of communication channel on test impulses. To avoid errors in predictions of intersymbol interference it is useful to apply the jump of carrier frequencies from one test impulse to another one. In this case it is necessary to make an estimate of channel impulse response in frequency band of information signals from channel response on series of test impulses, which transmitted in different frequency bands. Our article focuses on the algorithms for this estimation.
621.391
multibeam communication channel
test pulse
estimation algorithm
estimation error
pulse response
correlation
autocorrelation function
https://physmath.spbstu.ru/article/2014.23.18/
18ph_1_2014edit.150_156.pdf
CHR
RUS
157-163
Zykov
Valery
zykov@rphf.spbstu.ru
Ilyin
Vladimir
Shalygin
Vadim
shalygin@rphf.spbstu.ru
Vasil'eva
Maria
Gavricova
Tatiyana
Actual directions of semiconductor physics and nanostructures, semiconductor nano- and optoelectronics (on the 15th All-Russian Youth Conference)
Short review of results of the conference is done. The works, recommended to practical using, are mentioned.
621
semiconductor physics
nanoelectronics
optoelectronics
conference
https://physmath.spbstu.ru/article/2014.23.19/
19ph_1_2014Edit_157-163.pdf
CHR
RUS
164-168
Morachevski
Andrey
morachevski@mail.ru
Firsova
Elena
Professor Vladimir Efimovich Grum-Grzhimailo (on the occasionof his 150th birthday)
The article is dedicated to the life and creative work of V.E. Grum-Grzhimailo (1864 - 1928), who was an outstanding Russian and Soviet inventor, a metallurgical engineer, a pedagogue and a production organizer. He also was a corresponding member of the Academy of Science of the USSR (elected in 1927). For 11 years he was a lecturer at St. Petersburg Polytechnical Institute.
001 + 41
metallurgical engineer
Grum-Grzhimailo
corresponding member of academy of science of the USSR
SPBSPU
https://physmath.spbstu.ru/article/2014.23.20/
20ph_1_2014edit.164_168.pdf