1,080 research outputs found
Dairy cattle breeding effectiveness analysis under the conditions of import substitution
The relevance of the research problem is inspired by the strategic importance of dairy farming to the national economy, which is especially evident in the context of the EU economic sanctions against the Russian Federation and carrying out the import substitution policy. First and foremost, this policy applies to food commodities, including milk. The goal of the article is to study statistical productivity analysis of dairy cattle breeding as one of the major indicators to show its effectiveness (Privolzhsky Federal district in Russia is taken as the example). The main methods, used to study this problem are the index method, time series analysis, and correlation and regression analysis. As the study result there were identified the factors affecting the dairy cattle productivity, the prognosis and the conclusion about the positive aspects in solving problems of import substitution in the field of milk production. The article can be useful to regional governments in the development and adjustment programs for socio-economic development of subjects dealing with agriculture in the Volga Federal district of Russia. © 2016 Tokarev et al
УДАЛЕНИЕ ИНОРОДНОГО ТЕЛА ЛЕВОЙ ВИСОЧНОЙ ДОЛИ И СТРУКТУР СРЕДНЕЙ ЧЕРЕПНОЙ ЯМКИ
Penetrating brain injury is a rare but serious type of brain trauma. This article describes a successful surgical treatment of a victim with a wound of the left temporal lobe, great vessels and cranial nerves. Patients with damageв structures of the middle cranial fossa have to undergo surgical treatment in a specialized hospital with the possibility of comprehensive preoperative examination the availability of intensive care for neurosurgical patients with a full range of necessary medicines. Effective hemostatic materials are to be used to prevent intraoperative bleeding. In the absence of hemostatic materials, the operation is impractical.Проникающая черепно-мозговая травма — нечастый и тяжелый вид повреждения головного мозга. В статье описан ход успешного хирургического лечения пострадавшего с колото-резаным ранением левой височной доли, магистральных сосудов и черепных нервов. Пострадавшие с ранением структур средней черепной ямки должны получать хирургическое лечение в специализированном стационаре с возможностью всестороннего дооперационного обследования и наличием отделения реанимации для нейрохирургических больных с полным набором необходимых препаратов. С целью интраоперационного контроля кровотечения необходимо использовать современные гемостатические материалы, при отсутствии которых выполнение операции нецелесообразно
Centrality and transverse momentum dependence of elliptic flow of multi-strange hadrons and meson in Au+Au collisions at = 200 GeV
We present high precision measurements of elliptic flow near midrapidity
() for multi-strange hadrons and meson as a function of
centrality and transverse momentum in Au+Au collisions at center of mass energy
200 GeV. We observe that the transverse momentum dependence of
and is similar to that of and , respectively,
which may indicate that the heavier strange quark flows as strongly as the
lighter up and down quarks. This observation constitutes a clear piece of
evidence for the development of partonic collectivity in heavy-ion collisions
at the top RHIC energy. Number of constituent quark scaling is found to hold
within statistical uncertainty for both 0-30 and 30-80 collision
centrality. There is an indication of the breakdown of previously observed mass
ordering between and proton at low transverse momentum in the
0-30 centrality range, possibly indicating late hadronic interactions
affecting the proton .Comment: 7 pages and 4 figures, Accepted for publication in Physical Review
Letter
Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions
We present measurements of and elliptic flow, , at
midrapidity in Au+Au collisions at 200, 62.4, 39, 27,
19.6, 11.5 and 7.7 GeV, as a function of event-by-event charge asymmetry,
, based on data from the STAR experiment at RHIC. We find that
() elliptic flow linearly increases (decreases) with charge asymmetry
for most centrality bins at and higher.
At , the slope of the difference of
between and as a function of exhibits a
centrality dependence, which is qualitatively similar to calculations that
incorporate a chiral magnetic wave effect. Similar centrality dependence is
also observed at lower energies.Comment: 6 pages, 4 figure
Azimuthal anisotropy in U+U and Au+Au collisions at RHIC
Collisions between prolate uranium nuclei are used to study how particle
production and azimuthal anisotropies depend on initial geometry in heavy-ion
collisions. We report the two- and four-particle cumulants, and
, for charged hadrons from U+U collisions at =
193 GeV and Au+Au collisions at = 200 GeV. Nearly fully
overlapping collisions are selected based on the amount of energy deposited by
spectators in the STAR Zero Degree Calorimeters (ZDCs). Within this sample, the
observed dependence of on multiplicity demonstrates that ZDC
information combined with multiplicity can preferentially select different
overlap configurations in U+U collisions. An initial-state model with gluon
saturation describes the slope of as a function of multiplicity in
central collisions better than one based on Glauber with a two-component
multiplicity model.Comment: Final paper version accepted for publication in Phys. Rev. Lett. New
version includes comparisons to a constituent quark glauber mode
Isolation of Flow and Nonflow Correlations by Two- and Four-Particle Cumulant Measurements of Azimuthal Harmonics in 200 GeV Au+Au Collisions
A data-driven method was applied to measurements of Au+Au collisions at
200 GeV made with the STAR detector at RHIC to isolate
pseudorapidity distance -dependent and -independent
correlations by using two- and four-particle azimuthal cumulant measurements.
We identified a component of the correlation that is -independent,
which is likely dominated by anisotropic flow and flow fluctuations. It was
also found to be independent of within the measured range of
pseudorapidity . The relative flow fluctuation was found to be for particles of transverse momentum
less than GeV/. The -dependent part may be attributed to
nonflow correlations, and is found to be relative to the
flow of the measured second harmonic cumulant at
Observation of Transverse Spin-Dependent Azimuthal Correlations of Charged Pion Pairs in at GeV
We report the observation of transverse polarization-dependent azimuthal
correlations in charged pion pair production with the STAR experiment in
collisions at RHIC. These correlations directly probe quark
transversity distributions. We measure signals in excess of five standard
deviations at high transverse momenta, at high pseudorapidities eta>0.5, and
for pair masses around the mass of the rho-meson. This is the first direct
transversity measurement in p+p collisions. Comparing the results to data from
lepton-nucleon scattering will test the universality of these spin-dependent
quantities.Comment: 11 pages, 5 figures, 15 tables. Submitted to PR
Centrality dependence of identified particle elliptic flow in relativistic heavy ion collisions at sqrt(s)= 7.7--62.4 GeV
Elliptic flow (v_2) values for identified particles at midrapidity in Au + Au
collisions measured by the STAR experiment in the Beam Energy Scan at the
Relativistic Heavy Ion Collider at sqrt{s_{NN}}= 7.7--62.4 GeV are presented
for three centrality classes. The centrality dependence and the data at
sqrt{s_{NN}}= 14.5 GeV are new. Except at the lowest beam energies we observe a
similar relative v_2 baryon-meson splitting for all centrality classes which is
in agreement within 15% with the number-of-constituent quark scaling. The
larger v_2 for most particles relative to antiparticles, already observed for
minimum bias collisions, shows a clear centrality dependence, with the largest
difference for the most central collisions. Also, the results are compared with
A Multiphase Transport Model and fit with a Blast Wave model.Comment: 14 pages, 12 figures, Phys. Rev. C, to be published. Data tables
available at
https://drupal.star.bnl.gov/STAR/publications/centrality-dependence-identified-particle-elliptic-flow-relativistic-heavy-ion-collisi
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