1,300 research outputs found
Area Decay Law Implementation for Quark String Fragmentation
We apply the Area Decay Law (ADL) straightforwardly to simulate a quark
string hadronization and compare the results with the explicit analytic
calculations. We show that the usual "inclusive" Monte--Carlo simulations do
not correspond to the ADL because of two mistakes: not proper simulation of
two--dimensional probability density and lack of an important combinatorial
factor in a binary tree simulation. We also show how to simulate area decay law
"inclusively" avoiding the above--mentioned mistakes.Comment: 5 pages (REVTEX) + 3 figures (available in ps format from
G.G.Leptoukh , IPGAS-HE/93-3, to be
published in Phys. Rev.
Parton distributions in the photon from and scattering
Leading order parton distributions in the photon are extracted from the
existing measurements and the low- proton structure function.
The latter is related to the photon structure function by assuming Gribov
factorization to hold at low . The resulting parton distributions in the
photon are found to be consistent with the Frankfurt-Gurvich sum rule for the
photon.Comment: 8 pages, including 4 figure
Parameters of the Transmembrane Transport of Pelophylax ridibundus in the Conditions of Thermal Reservoirs
Study of Pelophylax ridibundus skin physiological parameters in a thermal basin shows that there are seasonal differences in PD (potential difference) and ISC (active transportation parameter). Amphibians studied in the summer time in a control area showed some differences compared to specimens caught in summer time in abasin with higher temperatures (River Malaya Kushva). We may suppose that this is connected with the habitation adaptation of the population
Generation of small-scale structures in the developed turbulence
The Navier-Stokes equation for incompressible liquid is considered in the
limit of infinitely large Reynolds number. It is assumed that the flow
instability leads to generation of steady-state large-scale pulsations. The
excitation and evolution of the small-scale turbulence is investigated. It is
shown that the developed small-scale pulsations are intermittent. The maximal
amplitude of the vorticity fluctuations is reached along the vortex filaments.
Basing on the obtained solution, the pair correlation function in the limit
is calculated. It is shown that the function obeys the Kolmogorov law
.Comment: 18 page
The tropical shadow-vertex algorithm solves mean payoff games in polynomial time on average
We introduce an algorithm which solves mean payoff games in polynomial time
on average, assuming the distribution of the games satisfies a flip invariance
property on the set of actions associated with every state. The algorithm is a
tropical analogue of the shadow-vertex simplex algorithm, which solves mean
payoff games via linear feasibility problems over the tropical semiring
. The key ingredient in our approach is
that the shadow-vertex pivoting rule can be transferred to tropical polyhedra,
and that its computation reduces to optimal assignment problems through
Pl\"ucker relations.Comment: 17 pages, 7 figures, appears in 41st International Colloquium, ICALP
2014, Copenhagen, Denmark, July 8-11, 2014, Proceedings, Part
On the Rational Type 0f Moment Angle Complexes
In this note it is shown that the moment angle complexes Z(K;(D^2,,S^1))
which are rationally elliptic are a product of odd spheres and a diskComment: This version avoids the use of an incorrect result from the
literature in the proof of Theorem 1.3. There is some text overlap with
arXiv:1410.645
Second Stage String Fragmentation Model
A string model, advocated by Bowler, provides a physical and intuitive
picture of heavy quark fragmentation. When supplemented by an ad hoc factor of
(1-z), to suppress fragmentation near z=1, it supplies an excellent fit to the
data. We extend Bowler's model by accounting for the further decay of the
massive mesonic states produced by the initial string breaking. We find that
each subsequent string break and cascade decay beyond the first, introduces a
factor of (1-z). Furthermore we find that including a finite mass for the
quarks, which pop out of the vacuum and split the string, forces the first
string breaking to produce massive states requiring further decay. This
sequence terminates at the second stage of fragmentation where only relatively
"light" heavy meson systems are formed. Thus we naturally account for the
phenomenologically required factor of (1-z). We also predict that the ratio of
(primary) fragments-vector/(vector plus scalar) should be .61. Our second stage
string fragmentation model provides an appealing picture of heavy quark
fragmentation.Comment: 15 page
VARIABILITY OF A SKELETON AND ANOMALIES OF JUVENILIES SIBERIAN FROG (RANA AMURENSIS)
The work represents analysis of deviations in skeleton variability of siberian frog – Rana amurensis juveniles. It was found that anomalies of axial skeleton predominate in sample under investigation. These results are differing from other three frog's species inhabiting Middle Urals by spectrum and frequency.В работе преставлен анализ вариантов скелетных аномалий сеголеток сибирской лягушки – Rana amurensis. Установлено, что в исследуемой выборке преобладают аномалии осевого скелета. Полученные результаты отличаются по спектру и частоте от данных по трем другим видам лягушек, населяющих Средний Урал
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