319 research outputs found
Numerical study of the influence of relative parameters of the metamaterial structure on its mechanical behavior
In this paper, attention is focused on the influence of changes in the variable parameters of the structure of mechanical tetrachiral metamaterial on its linear elastic behavior, in particular, on its twist. The parameters characterizing the structure of the metamaterial were chosen in a relative form with respect to the unit cell size and changed independently of each other in the investigation. The results of the mechanical behavior of the tetrachiral metamaterial in the event of changes in the structural parameters were obtained. The dependencies of the rotation angle when the relative parameters change were established and analyzed. The parameters of the chiral structure, the most affecting the unusual behavior of mechanical metamaterialβa twist under uniaxial loading, were determine
On the sources of Chekhovβs journey to Sakhalin
The article was submitted on 20.06.2016.Chekhovβs awareness of Sakhalinβs problems, as well as his βstylistic misunderstandingsβ with those writers who had touched upon this topic before, already existed before his 1890 trip. However, both this circumstance and his preparation for the trip have not been examined in detail. It is possible to understand the idea and the structure of Sakhalin Island with the analysis of the Bibliographical List that Chekhov compiled before the trip. The analysis of the list connects the writerβs life and his choice of artistic style. According to the author, the list is a unique bibliographical model in terms of biography and aesthetics. The chronological length it covers is much more significant than the short period of time the writer spent designing it. It enables the researcher to interpret Chekhovβs Sakhalin experience more deeply and can change the connections between the items of the list and the plot of Sakhalin Island. Having studied the Report on Russian Mental Hospitals by Dr Pavel Arkhangelsky (1887), Chekhov came up with the idea of performing a similar examination of Russian prisons. This book helps us to understand the nature of Sakhalin Island and the writerβs late prosaic works better. The works studied before the trip pushed the writer to develop a new style. The author suggests that the βnegativeβ side of Chekhovβs style might be linked with the limitations of official documentation. It is argued that Chekhov is followed his predecessors (those who wrote about hard labour and Sakhalin) in many ways. However, the author argues that Chekhov dared to disagree with them, having rejected existing stylistic forms. Analysis of the versatile and complicated style of Sakhalin Island can lead to more fruitful results if one takes into account the Report.Π Π°ΡΡΠΌΠΎΡΡΠ΅Π½Ρ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠΈ ΠΏΠΎΠ½ΠΈΠΌΠ°Π½ΠΈΡ Π§Π΅Ρ
ΠΎΠ²ΡΠΌ ΠΏΡΠΎΠ±Π»Π΅ΠΌΡ Π‘Π°Ρ
Π°Π»ΠΈΠ½Π°, Π° ΡΠ°ΠΊΠΆΠ΅ Π΅Π³ΠΎ Β«ΡΡΠΈΠ»ΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ°Π·Π½ΠΎΠ³Π»Π°ΡΠΈΡΒ» Ρ Π°Π²ΡΠΎΡΠ°ΠΌΠΈ, Π²ΡΡΠΊΠ°Π·Π°Π²ΡΠΈΠΌΠΈΡΡ Π½Π° ΡΡΡ ΡΠ΅ΠΌΡ, ΡΠ»ΠΎΠΆΠΈΠ²ΡΠΈΠ΅ΡΡ Π΅ΡΠ΅ Π΄ΠΎ ΠΏΠΎΠ΅Π·Π΄ΠΊΠΈ 1890 Π³. ΠΡΠΎ ΠΎΠ±ΡΡΠΎΡΡΠ΅Π»ΡΡΡΠ²ΠΎ, ΠΊΠ°ΠΊ ΠΈ ΠΊΠΎΠ½ΡΠ΅ΠΊΡΡ ΠΏΠΎΠ΄Π³ΠΎΡΠΎΠ²ΠΊΠΈ ΠΊ ΠΏΡΡΠ΅ΡΠ΅ΡΡΠ²ΠΈΡ, ΡΠ°Π·ΡΠ°Π±ΠΎΡΠ°Π½ΠΎ Π² ΡΠ΅Ρ
ΠΎΠ²Π΅Π΄Π΅Π½ΠΈΠΈ Π½Π΅ΠΏΠΎΠ»Π½ΠΎ. Π’Π°ΠΊΠΎΠ²Π° ΡΡΠ°Π΄ΠΈΡΠΈΡ, ΠΊΠΎΡΠ΅Π½ΡΡΠ°ΡΡΡ Π² ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠΈ ΠΊ Π§Π΅Ρ
ΠΎΠ²Ρ ΠΏΡΠΈΠΆΠΈΠ·Π½Π΅Π½Π½ΠΎΠΉ ΠΊΡΠΈΡΠΈΠΊΠΈ. ΠΠ²ΡΠΎΡ ΡΡΠ°Π²ΠΈΡ ΡΠ²ΠΎΠ΅ΠΉ Π·Π°Π΄Π°ΡΠ΅ΠΉ ΠΏΠΎΠ½ΡΡΡ ΡΠΌΡΡΠ», ΠΈΠ΄Π΅ΠΉΠ½ΡΡ ΡΡΡΡΠΊΡΡΡΡ Β«ΠΡΡΡΠΎΠ²Π° Π‘Π°Ρ
Π°Π»ΠΈΠ½Π°Β» Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ Π°Π½Π°Π»ΠΈΠ·Π° Β«ΠΠΈΠ±Π»ΠΈΠΎΠ³ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠΏΠΈΡΠΊΠ°Β», ΡΠΎΡΡΠ°Π²Π»Π΅Π½Π½ΠΎΠ³ΠΎ Π§Π΅Ρ
ΠΎΠ²ΡΠΌ Π΄ΠΎ ΠΏΠΎΠ΅Π·Π΄ΠΊΠΈ. ΠΠ·ΡΡΠ΅Π½ΠΈΠ΅ ΠΊΠΎΠ½ΡΠ΅ΠΊΡΡΠ° ΡΠΏΠΈΡΠΊΠ° ΡΠ²ΡΠ·ΡΠ²Π°Π΅Ρ ΠΏΡΠΎΠ±Π»Π΅ΠΌΡ ΠΆΠΈΠ·Π½Π΅Π½Π½ΠΎΠ³ΠΎ Π·Π°ΠΌΡΡΠ»Π° ΠΈ Π²ΡΠ±ΠΎΡΠ° Ρ
ΡΠ΄ΠΎΠΆΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠΉ ΠΌΠ°Π½Π΅ΡΡ ΠΏΠΈΡΠ°ΡΠ΅Π»Ρ. Π§Π΅Ρ
ΠΎΠ²ΡΠΊΠΈΠΉ ΡΠΏΠΈΡΠΎΠΊ, ΠΏΠΎ ΠΌΠ½Π΅Π½ΠΈΡ Π°Π²ΡΠΎΡΠ°, ΡΠ½ΠΈΠΊΠ°Π»ΡΠ½Π°Ρ Π² Π±ΠΈΠΎΠ³ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠΌ ΠΈ ΡΡΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΎΠΌ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠΈ Π±ΠΈΠ±Π»ΠΈΠΎΠ³ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠ°Ρ ΠΌΠΎΠ΄Π΅Π»Ρ. Π₯ΡΠΎΠ½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΠΏΠΎΠ½ΠΈΠΌΠ°Π½ΠΈΠ΅ Π΅Π³ΠΎ ΡΠ°ΠΌΠΎΠΊ Π³ΠΎΡΠ°Π·Π΄ΠΎ ΡΠΈΡΠ΅ ΠΊΠΎΡΠΎΡΠΊΠΎΠ³ΠΎ ΠΏΡΠΎΠΌΠ΅ΠΆΡΡΠΊΠ°, ΠΊΠΎΠ³Π΄Π° ΠΎΠ½ Π±ΡΠ» Π·Π°Π΄ΡΠΌΠ°Π½. ΠΠ½ΠΎ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ Π³Π»ΡΠ±ΠΆΠ΅ ΠΈΠ½ΡΠ΅ΡΠΏΡΠ΅ΡΠΈΡΠΎΠ²Π°ΡΡ ΡΠ°Ρ
Π°Π»ΠΈΠ½ΡΠΊΠΈΠΉ ΠΎΠΏΡΡ Π§Π΅Ρ
ΠΎΠ²Π° ΠΈ ΠΌΠ΅Π½ΡΠ΅Ρ ΡΠΌΡΡΠ» ΡΠ²ΡΠ·Π΅ΠΉ ΠΌΠ΅ΠΆΠ΄Ρ ΠΏΡΠ½ΠΊΡΠ°ΠΌΠΈ ΡΠΏΠΈΡΠΊΠ° ΠΈ ΡΡΠΆΠ΅ΡΠ½ΡΠΌΠΈ ΠΌΠΎΠΌΠ΅Π½ΡΠ°ΠΌΠΈ Β«ΠΡΡΡΠΎΠ²Π° Π‘Π°Ρ
Π°Π»ΠΈΠ½Π°Β». ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ ΡΠ°ΠΊΠΆΠ΅, ΡΡΠΎ Π·Π½Π°ΠΊΠΎΠΌΡΡΠ²ΠΎ Ρ Β«ΠΡΡΠ΅ΡΠΎΠΌ ΠΏΠΎ ΠΎΡΠΌΠΎΡΡΡ ΡΡΡΡΠΊΠΈΡ
ΠΏΡΠΈΡ
ΠΈΠ°ΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π·Π°Π²Π΅Π΄Π΅Π½ΠΈΠΉΒ» Π. Π. ΠΡΡ
Π°Π½Π³Π΅Π»ΡΡΠΊΠΎΠ³ΠΎ (1887) ΠΏΠΎΠ΄ΡΠΎΠ»ΠΊΠ½ΡΠ»ΠΎ Π§Π΅Ρ
ΠΎΠ²Π° ΠΊ ΠΌΡΡΠ»ΠΈ ΠΎΠ± Π°Π½Π°Π»ΠΎΠ³ΠΈΡΠ½ΠΎΠΌ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΈ ΡΡΡΠ΅ΠΌ. Β«ΠΡΡΠ΅Ρβ¦Β» ΡΠ³Π»ΡΠ±Π»ΡΠ΅Ρ ΠΏΠΎΠ½ΠΈΠΌΠ°Π½ΠΈΠ΅ Β«ΠΡΡΡΠΎΠ²Π° Π‘Π°Ρ
Π°Π»ΠΈΠ½Π°Β» ΠΈ ΠΏΠΎΠ·Π΄Π½Π΅ΠΉ ΠΏΡΠΎΠ·Ρ Π§Π΅Ρ
ΠΎΠ²Π°: ΠΈΠ·ΡΡΠ΅Π½ΠΈΠ΅ ΡΠ°ΠΊΠΈΡ
ΡΠ°Π±ΠΎΡ ΠΏΡΠΈΠ²Π΅Π»ΠΎ ΠΏΠΈΡΠ°ΡΠ΅Π»Ρ ΠΊ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΠΈ ΠΏΠΎΡΡΡΠΎΠ΅Π½ΠΈΡ Π½ΠΎΠ²ΠΎΠ³ΠΎ ΡΡΠΈΠ»Ρ. ΠΡΡΠΊΠ°Π·ΡΠ²Π°Π΅ΡΡΡ ΠΏΡΠ΅Π΄ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠ΅ ΠΎ ΡΠΎΠΌ, ΡΡΠΎ Β«ΠΎΡΡΠΈΡΠ°ΡΠ΅Π»ΡΠ½ΠΎΠ΅Β» Π½Π°ΡΠ°Π»ΠΎ ΡΠ΅Ρ
ΠΎΠ²ΡΠΊΠΎΠ³ΠΎ ΡΡΠΈΠ»Ρ ΡΠ²ΡΠ·Π°Π½ΠΎ Ρ ΠΏΠΎΠ½ΠΈΠΌΠ°Π½ΠΈΠ΅ΠΌ ΠΎΠ³ΡΠ°Π½ΠΈΡΠ΅Π½Π½ΠΎΡΡΠΈ ΠΎΡΠΈΡΠΈΠ°Π»ΡΠ½ΠΎΠΉ Π΄ΠΎΠΊΡΠΌΠ΅Π½ΡΠ°Π»ΠΈΡΡΠΈΠΊΠΈ, Π½Π΅ ΡΠΏΠΎΡΠΎΠ±Π½ΠΎΠΉ Π½Π° ΡΠ΅Π°Π»ΡΠ½ΡΠΉ ΠΏΡΠΎΡΠ΅ΡΡ. Π‘ΡΠΈΡΠ°Π΅ΡΡΡ, ΡΡΠΎ Π§Π΅Ρ
ΠΎΠ² Π²ΠΎ ΠΌΠ½ΠΎΠ³ΠΎΠΌ Π½Π°ΡΠ»Π΅Π΄ΡΠ΅Ρ ΡΠ²ΠΎΠΈΠΌ ΠΏΡΠ΅Π΄ΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΈΠΊΠ°ΠΌ β Π°Π²ΡΠΎΡΠ°ΠΌ ΡΠ°Π±ΠΎΡ ΠΎ ΠΊΠ°ΡΠΎΡΠ³Π΅ ΠΈ Π‘Π°Ρ
Π°Π»ΠΈΠ½Π΅. ΠΠ΄Π½Π°ΠΊΠΎ, ΠΏΠΎ ΠΌΡΡΠ»ΠΈ Π°Π²ΡΠΎΡΠ°, Π§Π΅Ρ
ΠΎΠ² ΡΠ΅ΡΠΈΠ»ΡΡ Π½Π° ΠΏΠΎΠ»Π΅ΠΌΠΈΠΊΡ Ρ Π½ΠΈΠΌΠΈ, ΠΎΡΠΊΠ°Π·Π°Π²ΡΠΈΡΡ ΠΎΡ Π²ΠΎΡΠΏΡΠΎΠΈΠ·Π²Π΅Π΄Π΅Π½ΠΈΡ ΡΡΡΠ΅ΡΡΠ²ΠΎΠ²Π°Π²ΡΠΈΡ
ΡΡΠΈΠ»ΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠΎΡΠΌ. ΠΠΏΠΈΡΠ°Π½ΠΈΠ΅ ΡΠ»ΠΎΠΆΠ½ΠΎΠ³ΠΎ ΡΡΠΈΠ»Ρ Β«ΠΡΡΡΠΎΠ²Π° Π‘Π°Ρ
Π°Π»ΠΈΠ½Π°Β» ΡΡΠ°Π½ΠΎΠ²ΠΈΡΡΡ Π±ΠΎΠ»Π΅Π΅ ΠΏΠ»ΠΎΠ΄ΠΎΡΠ²ΠΎΡΠ½ΡΠΌ Π±Π»Π°Π³ΠΎΠ΄Π°ΡΡ Π²Π²Π΅Π΄Π΅Π½ΠΈΡ Π² ΠΊΠΎΠ½ΡΠ΅ΠΊΡΡ Β«ΠΡΡΠ΅ΡΠ°β¦Β», Ρ
ΡΠΎΠ½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈ ΠΏΡΠ΅Π΄ΡΠ΅ΡΡΠ²ΡΡΡΠ΅Π³ΠΎ Π²ΡΠ΅ΠΌ ΡΠ°Π±ΠΎΡΠ°ΠΌ ΡΠ΅Ρ
ΠΎΠ²ΡΠΊΠΎΠ³ΠΎ ΡΠΏΠΈΡΠΊΠ°, Π·Π°ΠΊΡΠ΅ΠΏΠ»Π΅Π½Π½ΡΠΌ Π² Π°ΠΊΠ°Π΄Π΅ΠΌΠΈΡΠ΅ΡΠΊΠΎΠΌ ΡΠ΅Ρ
ΠΎΠ²Π΅Π΄Π΅Π½ΠΈΠΈ
Four-pion production
Starting from the low-energy structure derived from QCD, we extend the
amplitudes for four-pion production in e+ e- annihilation and tau decays up to
invariant four-pion masses of 1 GeV. Cross sections and branching ratios
BR(rho^0 -> 4 pi) are compared with available data.Comment: 4 pages, 3 figures, contribution to Proc. of QCD'02, Montpellier,
July 2002, misprints correcte
Analysis of stress and strain in the tetrachiral metamaterial with different kinds of unit cell connections
Metamaterials are artificially created materials whose unique properties are due to their structure rather than the chemical composition of the base material. The unit cells form the basis of a metamaterial. When creating the metamaterial, one should distinguish the methods of connecting its unit cells. The paper considers two methods of unit cell connection in a threedimensional metamaterialβjoining and overlapping. Connecting the cells in the metamaterial by joining method may lead to a differently directed rotation of the rings, which will have a negative effect on the entire sample of the metamaterial. In the case of the other connection method, there is no differently directed rotation, so it would appear reasonable that creating a sample of a metamaterial by this method would achieve greater values of twist. The asymmetric deformation pattern is investigated in this work. For the two methods considered, also different results were obtained on stress distribution and strain localization in the sample under uniaxial loading. In the system of two cells in the metamaterial obtained by the joining method, an additional center of localization of deformation occurs at the junction of the two edges, which make up the tetrachiral elemen
Reaction e^+e^-\to\pi^+\pi^-\pi^+\pi^- at energies \sqrt{s}\leq 1 GeV
The cross section of reaction e^+e^-\to\pi^+\pi^-\pi^+\pi^- is calculated for
energies 0.65\leq \sqrt{s}\leq1 GeV in the framework of the generalized hidden
local symmetry model. The calculations are compared with the data of CMD-2 and
BaBaR. It is shown that the inclusion of heavy isovector resonances \rho(1450)
and \rho(1700) is necessary for reconciling calculations with the data. It is
found that at \sqrt{s}\approx1 GeV the contributions of above resonances are
much larger, by the factor of 30, than the \rho(770) one, and are amount to a
considerable fraction \sim0.3-0.6 of the latter at \sqrt{s}\sim m_\rho.Comment: 4 pages, 3 figures; considerably reduced in siz
Production of pair in electron-positron annihilation in the Nambu-Jona-Lasinio model
The process is described in the framework of the
expanded NJL model in the energy region from 0.9 GeV to 1.5 GeV. The
contribution of intermediate state with vector mesons , and , where is the first radial
excitation of - meson was taken into account. Results obtained are in
satisfactory agreement with experimental data.Comment: 5 pages, 1 figure, 1 tabl
Calculation of on the Z
We perform a new, detailed calculation of the hadronic contributions to the
running electromagnetic coupling, , defined on the Z particle (91
GeV). We find for the hadronic contribution, including radiative corrections,
10^5\times \deltav_{\rm had.}\alpha(M_Z^2)= 2740\pm12, or, excluding the
top quark contribution, 10^5\times \deltav_{\rm had.}\alpha^{(5)}(M_Z^2)=
2747\pm12.
Adding the pure QED corrections we get a value for the running
electromagnetic coupling of Comment: Version to appear in Phys. Rev. D. Plain TeX fil
Numerical study of hard-metal powder compaction
Powder compacting is a widely used process for both metallurgy and pharmaceutical production. The mathematical simulation of the powder compaction process is a promising tool for its study. The compacting of WC/Co powder by a punch in a cylindrical die is simulated in this work. The use of the Drucker-Prager Cap constitutive model is made. Results on stress distribution and volume plastic deformation during compaction are obtained. Relative density distribution in the powder compact can also be estimated from volume plastic strain. The severe influence of frictional contact between powder and die wall on the results is noted
Influence of the angle interaction of the projectile with the wire mesh
The problem of interaction of the high-velocity solid spherical shock element simulating a micrometeoroid and the combined protective screen including the mesh barrier is considered. The mesh layer is made of steel wire by weaving method. As a result of numerical modeling by SPH method the results of protective wire mesh and projectile destruction behavior are obtained. The effectiveness of several variants of multilayer screen of equal specific mass with different angles of mesh layer orientation is compare
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