5,888 research outputs found
W + 2 jets production at Tevatron: VECBOS and CompHEP comparison
Results of calculation of all subprocesses in proton-antiproton collisions which contribute to the W+2jets final state are presented at Tevatron energy. The calculation has been carried out by means of the CompHEP software package. A detail comparison with VECBOS generator results for cross sections and various distributions shows an agreement at the level of Monte-Carlo accuracy. Therefore the independent check of VECBOS generator has been done. In addition to the VECBOS generator a new generator based on CompHEP allows to study individual subprocesses like Wb\bar{b} or Wc\bar{c}. The last point is important, for instance, for study Wb\bar{b} part of the background for single top or Standard Model Higgs signal at Tevatron
Spin-flop transition in uniaxial antiferromagnets: magnetic phases, reorientation effects, multidomain states
The classical spin-flop is the field-driven first-order reorientation
transition in easy-axis antiferromagnets. A comprehensive phenomenological
theory of easy-axis antiferromagnets displaying spin-flops is developed. It is
shown how the hierarchy of magnetic coupling strengths in these
antiferromagnets causes a strongly pronounced two-scale character in their
magnetic phase structure. In contrast to the major part of the magnetic phase
diagram, these antiferromagnets near the spin-flop region are described by an
effective model akin to uniaxial ferromagnets. For a consistent theoretical
description both higher-order anisotropy contributions and dipolar stray-fields
have to be taken into account near the spin-flop. In particular,
thermodynamically stable multidomain states exist in the spin-flop region,
owing to the phase coexistence at this first-order transition. For this region,
equilibrium spin-configurations and parameters of the multidomain states are
derived as functions of the external magnetic field. The components of the
magnetic susceptibility tensor are calculated for homogeneous and multidomain
states in the vicinity of the spin-flop. The remarkable anomalies in these
measurable quantities provide an efficient method to investigate magnetic
states and to determine materials parameters in bulk and confined
antiferromagnets, as well as in nanoscale synthetic antiferromagnets. The
method is demonstrated for experimental data on the magnetic properties near
the spin-flop region in the orthorhombic layered antiferromagnet
(C_2H_5NH_3)_2CuCl_4.Comment: (15 pages, 12 figures; 2nd version: improved notation and figures,
correction of various typos
Language as a special tool for intercultural understanding
ΠΠ°Ρ ΠΌΠΈΡ ΡΠ°ΡΡΡΡ ΠΈ ΡΠ°Π·Π²ΠΈΠ²Π°Π΅ΡΡΡ, ΠΈ ΠΌΡ Π½Π΅ ΠΌΠΎΠΆΠ΅ΠΌ ΠΎΡΡΠ°Π½ΠΎΠ²ΠΈΡΡ ΡΡΠΎΡ ΠΏΡΠΎΡΠ΅ΡΡ. Π‘ΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΡΡΡ Π³ΠΎΡΠΎΠ²ΠΈΡ ΡΠ΅Π»ΠΎΠ²Π΅ΠΊΡ Π²ΡΡ Π½ΠΎΠ²ΡΠ΅ ΠΈ Π½ΠΎΠ²ΡΠ΅ Π²ΡΠ·ΠΎΠ²Ρ ΠΈ ΠΈΡΠΏΡΡΠ°Π½ΠΈΡ. ΠΠ»Π°Π²Π½Π°Ρ Π·Π°Π΄Π°ΡΠ° ΡΠ΅Π»ΠΎΠ²Π΅ΡΠ΅ΡΡΠ²Π° Π·Π°ΠΊΠ»ΡΡΠ°Π΅ΡΡΡ Π² ΡΠΎΠΌ, ΡΡΠΎΠ±Ρ ΡΠΎΡ
ΡΠ°Π½ΠΈΡΡ ΡΠ²ΠΎΠΉ Π²ΡΡΠΎΠΊΠΎΠΊΡΠ»ΡΡΡΡΠ½ΡΠΉ ΠΎΠ±Π»ΠΈΠΊ, ΠΏΡΠ΅ΡΠΌΠ½ΠΎΠΆΠΈΡΡ Π½ΡΠ°Π²ΡΡΠ²Π΅Π½Π½ΡΠ΅ ΡΠ΅Π½Π½ΠΎΡΡΠΈ ΠΈ ΠΏΠ΅ΡΠ΅Π΄Π°ΡΡ ΠΈΡ
Π±ΡΠ΄ΡΡΠΈΠΌ ΠΏΠΎΠΊΠΎΠ»Π΅Π½ΠΈΡΠΌ. Π ΠΎΠ΄Π½ΠΎΠΉ ΡΠ·ΡΠΊ ΡΠ²Π»ΡΠ΅ΡΡΡ Π½Π΅ΠΎΡΡΠ΅ΠΌΠ»Π΅ΠΌΠΎΠΉ ΡΠ°ΡΡΡΡ ΠΊΠ°ΠΆΠ΄ΠΎΠΉ Π½Π°ΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎΠΉ ΠΊΡΠ»ΡΡΡΡΡ. ΠΠ΅Π· ΡΠ·ΡΠΊΠ° ΠΊΡΠ»ΡΡΡΡΠ° ΡΡΠ°Π½ΠΎΠ²ΠΈΡΡΡ Π±Π΅Π·Π»ΠΈΠΊΠΎΠΉ, Π±Π΅ΡΡΠΌΡΡΠ»Π΅Π½Π½ΠΎΠΉ ΠΈ ΡΡΠ°ΡΠΈΡΠ½ΠΎΠΉ. Π―Π·ΡΠΊ, ΠΊΠ°ΠΊ Π³Π»Π°Π²Π½ΡΠΉ ΠΈΡΡΠΎΡΠ½ΠΈΠΊ Π΅Ρ ΠΏΡΠΎΠ³ΡΠ΅ΡΡΠ° ΠΈ ΡΠ°ΡΠΏΡΠΎΡΡΡΠ°Π½Π΅Π½ΠΈΡ, ΠΏΠΎΠ΄Π²Π΅ΡΠ³Π°Π΅ΡΡΡ ΡΠΈΠ»ΡΠ½Π΅ΠΉΡΠΈΠΌ Π²Π½Π΅ΡΠ½ΠΈΠΌ Π²Π»ΠΈΡΠ½ΠΈΡΠΌ. Π―Π·ΡΠΊΠΎΠ²ΠΎΠ΅ ΡΠ²ΠΎΠ΅ΠΎΠ±ΡΠ°Π·ΠΈΠ΅ ΠΊΠ°ΠΆΠ΄ΠΎΠ³ΠΎ Π½Π°ΡΠΎΠ΄Π° Π½Π΅ ΠΌΠΎΠΆΠ΅Ρ Π½Π°Ρ
ΠΎΠ΄ΠΈΡΡΡΡ Π² ΠΈΠ·ΠΎΠ»ΡΡΠΈΠΈ ΠΎΡ ΠΎΡΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΌΠΈΡΠ°, ΠΊΠ°ΠΊ Π½Π΅ ΠΌΠΎΠΆΠ΅Ρ ΡΡΡΠ΅ΡΡΠ²ΠΎΠ²Π°ΡΡ ΠΊΡΠ»ΡΡΡΡΠ° Π²Π½Π΅ ΠΊΠΎΠ½ΡΠ΅ΠΊΡΡΠ° ΡΠ²ΠΎΠΈΡ
ΠΈΡΡΠΎΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΡΠ»ΠΎΠ²ΠΈΠΉ. Π‘ΠΎΡ
ΡΠ°Π½Π΅Π½ΠΈΡ Π½Π°ΡΠΈΠΎΠ½Π°Π»ΡΠ½ΡΡ
ΠΊΡΠ»ΡΡΡΡ ΠΈ ΡΠ·ΡΠΊΠΎΠ² ΡΠΏΠΎΡΠΎΠ±ΡΡΠ²ΡΠ΅Ρ Π²ΠΎΡΠΏΠΈΡΠ°Π½ΠΈΠ΅ ΡΠΎΠ»Π΅ΡΠ°Π½ΡΠ½ΠΎΡΡΠΈ ΠΈ ΡΠ΅ΡΠΏΠΈΠΌΠΎΡΡΠΈ Π² ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΌ ΠΎΠ±ΡΠ΅ΡΡΠ²Π΅. ΠΠΎΠ±ΠΈΡΡΡΡ Π³ΡΠ°ΠΌΠΎΡΠ½ΠΎΠ³ΠΎ Π΄ΠΈΠ°Π»ΠΎΠ³Π° ΠΊΡΠ»ΡΡΡΡ ΠΌΠΎΠΆΠ½ΠΎ Π»ΠΈΡΡ ΡΠΏΠΎΡΠ½ΡΠΌ ΡΡΡΠ΄ΠΎΠΌ ΠΈ Π·Π°ΠΈΠ½ΡΠ΅ΡΠ΅ΡΠΎΠ²Π°Π½Π½ΠΎΡΡΡΡ Π²ΡΠ΅Ρ
ΡΡΠΎΡΠΎΠ½ Π² Π΄ΠΎΡΡΠΈΠΆΠ΅Π½ΠΈΠΈ Π²Π·Π°ΠΈΠΌΠΎΠΏΠΎΠ½ΠΈΠΌΠ°Π½ΠΈΡ ΠΈ Π½Π°Ρ
ΠΎΠΆΠ΄Π΅Π½ΠΈΠΈ ΠΌΠΈΡΠ½ΠΎΠ³ΠΎ ΠΊΠΎΠΌΠΏΡΠΎΠΌΠΈΡΡΠ°. ΠΠΌΠ΅Π½Π½ΠΎ Π½Π° Π²Π·Π°ΠΈΠΌΠΎΠΏΠΎΠ½ΠΈΠΌΠ°Π½ΠΈΠΈ ΠΈ Π΄ΠΈΠ°Π»ΠΎΠ³Π΅ ΠΊΡΠ»ΡΡΡΡ Π΄ΠΎΠ»ΠΆΠ½Ρ ΡΡΡΠΎΠΈΡΡΡΡ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΡΠ΅ ΠΌΠ΅ΠΆΠ΄ΡΠ½Π°ΡΠΎΠ΄Π½ΡΠ΅ Π΄ΠΈΠΏΠ»ΠΎΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡ. ΠΠΎΠ·ΡΠΎΠΆΠ΄Π΅Π½ΠΈΠ΅ ΠΏΡΠΈΠ½ΡΠΈΠΏΠΎΠ² Π³ΡΠΌΠ°Π½ΠΈΠ·ΠΌΠ° ΠΈ Π΄ΠΎΠ±ΡΠ° β ΠΏΠ΅ΡΠ²ΡΠΉ ΡΠ°Π³ Π½Π° ΠΏΡΡΠΈ ΠΊ ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΈΡ ΠΌΠΈΡΠ° ΠΌΠ΅ΠΆΠ΄Ρ ΠΊΡΡΠΏΠ½Π΅ΠΉΡΠΈΠΌΠΈ Π΄Π΅ΡΠΆΠ°Π²Π°ΠΌΠΈ. Π§Π΅Π»ΠΎΠ²Π΅ΡΠ΅ΡΡΠ²Ρ Π½Π΅ΡΡΠ°Π²Π½ΠΈΠΌΠΎ Π»Π΅Π³ΡΠ΅ ΡΠ°Π·Π²ΠΈΠ²Π°ΡΡΡΡ Π² Π³Π°ΡΠΌΠΎΠ½ΠΈΡΠ½ΡΡ
ΡΡΠ»ΠΎΠ²ΠΈΡΡ
, ΠΏΠΎΡΠΎΠΌΡ ΠΏΠΎΠ½ΠΈΠΌΠ°Π½ΠΈΠ΅ ΠΈ ΠΏΡΠΈΠ½ΡΡΠΈΠ΅ ΡΡΠΆΠΎΠ³ΠΎ ΡΠ·ΡΠΊΠ° ΠΈ ΠΊΡΠ»ΡΡΡΡΡ ΡΠ²Π»ΡΠ΅ΡΡΡ Π΄Π»Ρ Π½Π°Ρ Π³Π»Π°Π²Π½ΡΠΌ ΡΡΠ»ΠΎΠ²ΠΈΠ΅ΠΌ ΠΏΠ»ΠΎΠ΄ΠΎΡΠ²ΠΎΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΡΠ΄Π½ΠΈΡΠ΅ΡΡΠ²Π°.Our world keeps developing and growing, and we cannot prevent this process. The present is preparing new and new challenges and difficulties for us. The main task for humanity is to preserve its high cultured make-up; to increase moral, spiritual values and past them to future generations. Native language is an integral part of every ethnic culture. Culture becomes featureless, unmeaning and static without language. Language, as the main source of its progress and spreading, undergoes powerful external impacts. Language identity of every nation cannot be in isolation from the other world; as well as culture cannot exist out of its historical conditions context. Education of tolerance and indulgence in modern society makes for preservation of ethnic cultures and languages. The only possible opportunity to obtain a skilful cultural dialogue for parties is to work hard and be interested in achieving of understanding and peace compromise. Contemporary international diplomatic relations should be based on cultural dialogue and understanding. Revival of humanistic principles is the first step to establishment the peace between world powers. Humanity is developing incomparably easier in harmonic conditions. That is why, understanding and acceptance of foreign languages and cultures is the main term of fruitful collaboration
The Second Stokes Problem with Specular - Diffusive Boundary Conditions in Kinetic Theory
The second Stokes problem with specular - diffusive boundary conditions of
the kinetic theory is considered. The new method of the decision of the
boundary problems of the kinetic theory is applied. The method allows to
receive the decision with any degree of accuracy. At the basis of a method lays
the idea of representation of a boundary condition on distribution function in
the form of a source in the kinetic equation. By means of integrals Fourier the
kinetic equation with a source is reduced to the integral equation of Fredholm
type of the second kind. The decision is received in the form of Neumann's
series.Comment: 20 pages, 2 figure
Analytical solution of second Stokes problem of behaviour of rarefied gas with Cercignani boundary accomodation conditions
Analytical solution of second Stokes problem of behaviour of rarefied gas
with Cercignani boundary accomodation conditions The second Stokes problem
about behaviour of rarefied gas filling half-space is analytically solved. A
plane, limiting half-space, makes harmonious fluctuations in the plane. The
kinetic BGK-equation (Bhatnagar, Gross, Krook) is used. The boundary
accomodation conditions of Cercignani of reflexion gaseous molecules from a
wall are considered. Distribution function of the gaseous molecules is
constructed. The velocity of gas in half-space is found, also its value direct
at a wall is found. The force resistance operating from gas on border is found.
Besides, the capacity of dissipation of the energy falling to unit of area of
the fluctuating plate limiting gas is obtained.Comment: 26 pages, 5 figure
CompHEP 4.4 - Automatic Computations from Lagrangians to Events
We present a new version of the CompHEP program (version 4.4). We describe
shortly new issues implemented in this version, namely, simplification of quark
flavor combinatorics for the evaluation of hadronic processes, Les Houches
Accord based CompHEP-PYTHIA interface, processing the color configurations of
events, implementation of MSSM, symbolical and numerical batch modes, etc. We
discuss how the CompHEP program is used for preparing event generators for
various physical processes. We mention a few concrete physics examples for
CompHEP based generators prepared for the LHC and Tevatron.Comment: The paper has been presented on IX International Workshop on Advanced
Computing and Analysis Techniques in Physics Research December 1-5, 2003.
KEK, Japan. 10 pages, 2 figure
Magnetoresistive study of antiferromagnetic--weak ferromagnetic transition in single-crystal LaCuO
The resistive measurements were made to study the magnetic field-induced
antiferromagnetic (AF) - weak ferromagnetic (WF) transition in LaCuO
single-crystal. The magnetic field (DC or pulsed) was applied normally to the
CuO layers. The transition manifested itself in a drastic decrease of the
resistance in critical fields of ~5-7 T. The study is the first to display the
effect of the AF -WF transition on the conductivity of the LaCuO
single-crystal in the parallel - to - CuO layers direction. The results
provide support for the 3-dimensional nature of the hopping conduction of this
layered oxide.Comment: 8 pages, 7 figures, RevTe
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