944 research outputs found
Estimation of Non-femtoscopic Effects in p+p and p+A Collisions at RHIC Energies using PYTHIA and HIJING Generators
The spatial extents of particle emission source in high-energy collisions can be measured using two-particle femtoscopic correlations. In collisions with small multiplicities, such as proton-proton collisions, correlation functions can be distorted by non-femtoscopic effects, for example due to the correlations that caused by energy-momentum conservation laws, jets and mini-jets. To estimate these effects, a simulation of p+p collisions at
Trajectories in the Context of the Quantum Newton's Law
In this paper, we apply the one dimensional quantum law of motion, that we
recently formulated in the context of the trajectory representation of quantum
mechanics, to the constant potential, the linear potential and the harmonic
oscillator. In the classically allowed regions, we show that to each classical
trajectory there is a family of quantum trajectories which all pass through
some points constituting nodes and belonging to the classical trajectory. We
also discuss the generalization to any potential and give a new definition for
de Broglie's wavelength in such a way as to link it with the length separating
adjacent nodes. In particular, we show how quantum trajectories have as a limit
when the classical ones. In the classically forbidden regions,
the nodal structure of the trajectories is lost and the particle velocity
rapidly diverges.Comment: 17 pages, LateX, 6 eps figures, minor modifications, Title changed,
to appear in Physica Script
Lateral distribution of high energy muons in EAS of sizes Ne approximately equals 10(5) and Ne approximately equals 10(6)
Muon energy spectra and muon lateral distribution in EAS were investigated with the underground magnetic spectrometer working as a part of the extensive air showers (EAS) array. For every registered muon the data on EAS are analyzed and the following EAS parameters are obtained, size N sub e, distance r from the shower axis to muon, age parameter s. The number of muons with energy over some threshold E associated to EAS of fixed parameters are measured, I sub reg. To obtain traditional characteristics, muon flux densities as a function of the distance r and muon energy E, muon lateral distribution and energy spectra are discussed for hadron-nucleus interaction model and composition of primary cosmic rays
Multiqubit Spin
It is proposed that the state space of a quantum object with a complicated
discrete spectrum can be used as a basis for multiqubit recording and
processing of information in a quantum computer. As an example, nuclear spin
3/2 is considered. The possibilities of writing and reading two quantum bits of
information, preparation of the initial state, implementation of the "rotation"
and "controlled negation" operations, which are sufficient for constructing any
algorithms, are demonstrated.Comment: 7 pages, PostScript, no figures; translation of Pis'ma Zh. Eksp.
Teor. Fiz. 70, No. 1, pp. 59-63, 10 July 1999; (Submitted 29 April 1999;
resubmitted 2 June 1999
Three-Qubit Gate Realization Using Single Quantum Particle
Using virtual spin formalism it is shown that a quantum particle with eight
energy levels can store three qubits. The formalism allows to realize a
universal set of quantum gates. Feasible formalism implementation is suggested
which uses nuclear spin-7/2 as a storage medium and radio frequency pulses as
the gates. One pulse realization of all universal gates has been found,
including three-qubit Toffoli gate.Comment: LaTeX, 6 pages, no figures; Submitted to "Pis'ma v Zh. Eksp. Teor.
Fiz.
The Structure of Martian Magnetosphere at the Dayside Terminator Region as Observed on MAVEN Spacecraft
We analyzed 44 passes of the MAVEN spacecraft through the magnetosphere,
arranged by the angle between electric field vector and the projection of
spacecraft position radius vector in the YZ plane in MSE coordinate system
( E ). All passes were divided into 3 angular sectors near 0{\deg},
90{\deg} and 180{\deg} E angles in order to estimate the role of IMF
direction in plasma and magnetic properties of dayside Martian magnetosphere.
The time interval chosen was from January 17 through February 4, 2016 when
MAVEN was crossing the dayside magnetosphere at SZA ~ 70{\deg}. Magnetosphere
as the region with prevailing energetic planetary ions is always found between
the magnetosheath and the ionosphere. 3 angular sectors of dayside interaction
region in MSE coordinate system with different orientation of the solar wind
electric field vector E = -1/c V x B showed that for each sector one can find
specific profiles of the magnetosheath, the magnetic barrier and the
magnetosphere. Plume ions originate in the northern MSE sector where motion
electric field is directed from the planet. This electric field ejects
magnetospheric ions leading to dilution of magnetospheric heavy ions
population, and this effect is seen in some magnetospheric profiles. Magnetic
barrier forms in front of the magnetosphere, and relative magnetic field
magnitudes in these two domains vary. The average height of the boundary with
ionosphere is ~530 km and the average height of the magnetopause is ~730 km. We
discuss the implications of the observed magnetosphere structure to the
planetary ions loss mechanism.Comment: 24 pages, 13 figure
The oxygen isotope effect on critical temperature in superconducting copper oxides
The isotope effect provided a crucial key to the development of the BCS
(Bardeen-Cooper-Schrieffer) microscopic theory of superconductivity for
conventional superconductors. In superconducting cooper oxides (cuprates)
showing an unconventional type of superconductivity, the oxygen isotope effect
is very peculiar: the exponential coefficient strongly depends on doping level.
No consensus has been reached so far on the origin of the isotope effect in the
cuprates. Here we show that the oxygen isotope effect in cuprates is in
agreement with the bisoliton theory of superconductivity.Comment: 3 pages including 4 figures; version 2 is with minor correction
Artistic creativity of martiros saryan as the indicator of national self-identification of the personality in a multicultural space: features of methodology of a retrospective research
In this article, the life and works of the famous Armenian artist, founder of the modern Armenian school of painting Martiros Saryan (1880-1972) are analyzed in the context of the influence of Russian and Armenian culture during the Russian period of his activity. In this retrospective analysis of the life and works of the artist, it is proposed to use the new indicator, which is Russian or the Middle East countries place names being included in the titles of works by the artist. On the basis of the analysis of Russian archival sources and the analytical research of content, it is established that, in Russia, the interest of the artist during the first period of his life and study was mainly on subjects reflecting the life of the Armenian diaspora in the south of Russia. Landscapes were mainly represented against the background in which the artist spent his childhood. During the time which he spent in Moscow, interest in Russian culture was connected with the recognition of the contribution of teachers of the School of Painting, Sculpture and Architecture in the development of the Russian art school and world culture. Saryan has shown the aspiration to seize this particular technic of painting, at the same time he had the original vision of the world. Keywords: methodology, personality, geographical indicators, Martiros Saryan, culture,regional archiv
The System of Tactical Tasks and Means of Their Solution in Various Situations of Investigation of Illegal Cultivation of Plants Containing Drugs or Psychotropic Substances or Their Precursors
This article deals with the problem of counteracting illicit cultivation of narcotic plants, which is a fairly common crime in the sphere of drug trafficking. The idea that counteraction to these crimes is possible with the help of modern methods of investigation is substantiated. The authors of the article consider such structural elements of the methodology for investigating the illicit cultivation of plants containing narcotic drugs or psychotropic substances or their precursors, as initial investigative situations and a system of tactical tasks in each of them. The authors focus on the need to determine the sequence of actions, to make out an algorithm of the investigation process in order to improve the quality of the preliminary investigation. Based on the study, the authors proposed a set of general and facultative tactical problems of investigation of this type of crimes, subject to resolution, the variability of which is determined by the initial investigative situation. The study justifies the idea of the need to improve the existing forensic methods and the development of universal guidelines, the construction of an investigator's algorithm for investigating crimes of this type
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