555 research outputs found
CompHEP-PYTHIA interface: integrated package for the collision events generation based on exact matrix elements
CompHEP, as a partonic event generator, and PYTHIA, as a generator of final
states of detectable objects, are interfaced. Thus, integrated tool is proposed
for simulation of (almost) arbitrary collision processes at the level of
detectable particles. Exact (multiparticle) matrix elements, convolution with
structure functions, decays, partons hadronization and (optionally) parton
shower evolution are basic stages of calculations. The PEVLIB library of event
generators for LHC processes is described.Comment: Standard LaTeX, 4 pages. To appear in the proceedings of the Seventh
International Workshop on Advanced Computing and Analysis Technics in Physics
Research (ACAT2000, Fermilab, October 16-20, 2000
The formation of social-psychological competence in professional activity of subjects two different groups of bank workers
© 2014 Copyright for this article is retained by the author(s). The research of the problems caused by occupational optimization of Bank employees aimed at creating a social-psychological competence in their professional activity, which is ordered in the labour market. The purpose of the article is aimed at identifying the personal characteristics of the subjects of the two different groups of Bank employees in their professional activities. A leading method is a method of testing aimed at identifying personal characteristics such as: empathic abilities, personality predisposition to conflict behavior, ability to listen, machiavellism. The article revealed that the socio-psychological competence of the subjects of the two different groups of Bank employees is determined by a set of specific vocational skills, such as empathic abilities, personality predisposition to conflict behavior, listening skills, the manifestation of machiavellism. The article can be useful for selection and placement of personnel in the internal environment
Accretion of low angular momentum material onto black holes: 2D hydrodynamical inviscid case
We report on the first phase of our study of slightly rotating accretion
flows onto black holes. We consider inviscid accretion flows with a spherically
symmetric density distribution at the outer boundary, but with spherical
symmetry broken by the introduction of a small, latitude-dependent angular
momentum. We study accretion flows by means of numerical 2D, axisymmetric,
hydrodynamical simulations. Our main result is that the properties of the
accretion flow do not depend as much on the outer boundary conditions (i.e.,
the amount as well as distribution of the angular momentum) as on the geometry
of the non-accreting matter. The material that has too much angular momentum to
be accreted forms a thick torus near the equator. Consequently, the geometry of
the polar region, where material is accreted (the funnel), and the mass
accretion rate through it are constrained by the size and shape of the torus.
Our results show one way in which the mass accretion rate of slightly rotating
gas can be significantly reduced compared to the accretion of non-rotating gas
(i.e., the Bondi rate), and set the stage for calculations that will take into
account the transport of angular momentum and energy.Comment: LaTeX,to appear in Ap
Efficient Utilization of Rare Variants for Detection of Disease-Related Genomic Regions
When testing association between rare variants and diseases, an efficient analytical approach involves considering a set of variants in a genomic region as the unit of analysis. One factor complicating this approach is that the vast majority of rare variants in practical applications are believed to represent background neutral variation. As a result, analyzing a single set with all variants may not represent a powerful approach. Here, we propose two alternative strategies. In the first, we analyze the subsets of rare variants exhaustively. In the second, we categorize variants selectively into two subsets: one in which variants are overrepresented in cases, and the other in which variants are overrepresented in controls. When the proportion of neutral variants is moderate to large we show, by simulations, that the both proposed strategies improve the statistical power over methods analyzing a single set with total variants. When applied to a real sequencing association study, the proposed methods consistently produce smaller p-values than their competitors. When applied to another real sequencing dataset to study the difference of rare allele distributions between ethnic populations, the proposed methods detect the overrepresentation of variants between the CHB (Chinese Han in Beijing) and YRI (Yoruba people of Ibadan) populations with small p-values. Additional analyses suggest that there is no difference between the CHB and CHD (Chinese Han in Denver) datasets, as expected. Finally, when applied to the CHB and JPT (Japanese people in Tokyo) populations, existing methods fail to detect any difference, while it is detected by the proposed methods in several regions
Inclusive meson production in peripheral collisions of ultrarelativistic heavy ions
There exist several proposals to use Weizs\"{a}cker-Williams photons
generated by ultrarelativistic heavy ions to produce exotic particles in
fusion reactions. To estimate the background conditions for such
reactions we analyze various mechanisms of meson production in very peripheral
collisions of ultrarelativistic heavy ions at RHIC and LHC energies. Besides
fusion they include also electromagnetic interactions
and strong nucleon-nucleon interactions in grazing collisions. All these
processes are characterised by low multiplicities of produced particles.
and events are simulated by corresponding Monte Carlo codes,
RELDIS and FRITIOF. In each of these processes a certain fraction of pions is
produced close to the mid-rapidity region that gives a background for the
events. The possibility of selecting mesons produced in
fusion events via different cut procedures is
demonstrated.Comment: 27 pages with 4 eps-figures included, uses axodraw.sty Tab.2 and 3
correcte
Synchronous bursts on scale-free neuronal networks with attractive and repulsive coupling
This paper investigates the dependence of synchronization transitions of
bursting oscillations on the information transmission delay over scale-free
neuronal networks with attractive and repulsive coupling. It is shown that for
both types of coupling, the delay always plays a subtle role in either
promoting or impairing synchronization. In particular, depending on the
inherent oscillation period of individual neurons, regions of irregular and
regular propagating excitatory fronts appear intermittently as the delay
increases. These delay-induced synchronization transitions are manifested as
well-expressed minima in the measure for spatiotemporal synchrony. For
attractive coupling, the minima appear at every integer multiple of the average
oscillation period, while for the repulsive coupling, they appear at every odd
multiple of the half of the average oscillation period. The obtained results
are robust to the variations of the dynamics of individual neurons, the system
size, and the neuronal firing type. Hence, they can be used to characterize
attractively or repulsively coupled scale-free neuronal networks with delays.Comment: 15 pages, 9 figures; accepted for publication in PLoS ONE [related
work available at http://arxiv.org/abs/0907.4961 and
http://www.matjazperc.com/
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