538 research outputs found
Tubular initial conditions and ridge formation
The 2D azimuth & rapidity structure of the two-particle correlations in
relativistic A+A collisions is altered significantly by the presence of sharp
inhomogeneities in superdense matter formed in such processes. The causality
constraints enforce one to associate the long-range longitudinal correlations
observed in a narrow angular interval, the so-called (soft) ridge, with
peculiarities of the initial conditions of collision process. This study's
objective is to analyze whether multiform initial tubular structures,
undergoing the subsequent hydrodynamic evolution and gradual decoupling, can
form the soft ridges. Motivated by the flux-tube scenarios, the initial energy
density distribution contains the different numbers of high density tube-like
boost-invariant inclusions that form a bumpy structure in the transverse plane.
The influence of various structures of such initial conditions in the most
central A+A events on the collective evolution of matter, resulting spectra,
angular particle correlations and v_n-coefficients is studied in the framework
of the HydroKinetic Model (HKM).Comment: 18 pages, 6 figures, the paper to be published in Advances of High
Energy Physics (2013, in press
Content of malondialdehyde and activity of enzyme glutathione-S-transferase in the leaves of emmer wheat under the action of herbicide and plant growth regulator
ArticleThe article presents the results of vegetation experiment on the influence of different
rates of herbicide Prima Forte 195 – 2-ethylhexyl ether 2.4-D + aminopyralid + florasulam (0.5;
0.6 and 0.7 L ha-1
) under different application methods of plant growth regulator of a natural
origin Wuxal BIO Vita (Ascophyllum nodosum extract + microelements) on the content of
malondialdehyde (MDA) as an important indicator of the intensity of peroxide oxidation of lipids
in plants and on the activity of enzyme glutathione-S-transferase (GST) in the leaves of emmer
wheat.
Experimental scheme included 16 experimental variants: 1 – without application of preparations
and pre-sowing treatment of seeds (control); 2, 3, 4 – Prima Forte 195, applied to vegetative
plants at the rates 0.5, 0.6 and 0.7 L ha-1
; 5 – Wuxal BIO Vita at the rate of 1.0 L ha-1
, applied to
vegetative plants; 6, 7, 8 – Prima Forte 195 at the rates of 0.5, 0.6 and 0.7 L ha-1
in tank mixtures
with Wuxal BIO Vita at the rate of 1.0 L ha-1
, sprayed on vegetative plants; 9 – pre-sowing
treatment of seeds with Wuxal BIO Vita at the rate of 1.0 L t
-1
(background); 10, 11, 12 – Prima
forte 195, applied to vegetative plants at the rates of 0.5, 0.6 and 0.7 L ha-1
at the background of
pre-sowing treatment of seeds with Wuxal BIO Vita at the rate of 1.0 L t
-1
; 13 – Wuxal BIO Vita
at the rate of 1.0 L ha-1
(applied to vegetative plants, treated before sowing with Wuxal BIO Vita
at the rate of 1.0 L t
-1
); 14, 15, 16 – Prima Forte 195 at the rates of 0.5, 0.6 and 0.7 L ha-1
respectively, in tank mixture with Wuxal BІО Vita at the rate of 1.0 L ha -1 –
spraying of plants
and pre-sowing treatment of seeds with Wuxal BІО Vita 1.0 L t
-1
.
It has been found that under the application of Prima Forte 195 the redox state in the leaves of
emmer wheat increased considerably in the direction of increasing the content of MDA. It has
also been proved that herbicide Prima Forte 195 and its mixtures with plant growth regulator
(PGR) Wuxal BIO Vita caused the changes in the activity of enzyme glutathione-S-transferase,
which slightly increased in the initial period in the variants of integrated application of herbicide
and plant growth regulator. However, later the GST activity in the variants of integrated
application of herbicide and PGR decreased, which indicates stabilization and a positive influence
of integrated application of preparations on the detoxification processes in the crops of emmer
wheat
Hydrokinetic predictions for femtoscopy scales in A+A collisions in the light of recent ALICE LHC results
A study of energy behavior of the pion spectra and interferometry scales is
carried out for the top SPS, RHIC and for LHC energies within the hydrokinetic
approach. The main mechanisms that lead to the paradoxical, at first sight,
dependence of the interferometry scales with an energy growth, in particular, a
decrease ratio, are exposed. The hydrokinetic predictions
for the HBT radii at LHC energies are compared with the recent results of the
ALICE experiment.Comment: Based on the talks given at the Sixth Workshop on Particle
Correlations and Femtoscopy, BITP, Kiev, September 14 - 18, 2010 and GSI/EMMI
Seminar, January 14, 201
Методика оценки загруженности Grid-среды НАН Украины
Зроблено огляд найбільш поширених систем моніторингу Grid-середовища. Запропоновано методику його завантаженості в залежності від свідчень системи моніторингу. Ця методика дозволяє виразити завантаженість Grid у процентах, що показують відношення поточного завантаження до оптимального. Використання запропонованої методики дозволяє поліпшити представлення та аналіз інформації, яка збирається системою моніторингу.The most widely used Grid monitoring systems are overviewed. Techniques for estimation of Grid-medium workload are proposed depending on the information from a monitoring system which make it possible to express the Grid workload by percents and to confirm the relationship between the current and optimum workloads.Сделан обзор наиболее распространенных систем мониторинга Grid-среды. Предложена методика оценки ее загруженности в зависимости от показаний систем мониторинга, позволяющая выразить загруженность Grid в процентах и подтверждающая отношение текущей загруженности к оптимальной
Russian specialized periodicals in culture as a modern communicative channel
The key factor of modern society development is mass media, and nowadays its demanded business model is the translation of advertising informatio
Agrobiological assessment of productivity and nitrogen fixation of vegetable soybean (edamame) in the conditions of Forest-Steppe of Ukraine
Received: May 25th, 2023 ; Accepted: October 18th, 2023 ; Published: October 30th, 2023 ; Correspondence: [email protected] evaluation of vegetable soybean cultivars (Glycine max var. Shirofumi)
according to a complex of economically valuable traits for introduction in the conditions of the
Forest-Steppe of Ukraine it was carried out with the aim of selecting the source material and
selecting promising breeding forms according to morpho-biological and physiologicalbiochemical characteristics. The research was conducted in the conditions of the educational and
production department of Uman National University of Horticulture during 2020–2022,
collection cultivars of different ecological and geographical origins were used. The cultivars ‘Sac’
(166.00 g plant-1
), ‘Vesta’ (139.33 g plant-1
), ‘Fiskeby V’ (133.33 g plant-1
), and ‘Fiskeby V-E5’
(146.67 g plant-1
) possessed a large mass of edamame beans. The maximum yield of edamame
beans was formed by plants of the ‘L 380-2-13’ (12.67 t ha-1
), ‘Vesta’ (12.33 t ha-1
), ‘Sac’
(13.20 t ha-1
), ‘Fiskeby V’ (13.97 t ha-1
), and ‘Fiskeby V-E5’ (14.53 t ha-1
). Weather conditions
during the period of research significantly influenced the yield and biochemical composition of
edamame varieties. The yield of edamame beans ranged from 5.40 t ha-1
in 2020 (min) to
22.40 t ha-1 in 2021 (max), and the coefficient of variation by varieties was at the level of 19–41%.
This phenomenon is explained by the minimum amount of precipitation in 2020 and the high
amount in 2021, which is confirmed by the hydrothermal coefficient during the period of intensive
pod growth (VII–VIII) - 2020 - 0.3; 2021 - 1.3 and 1.1 respectively for the month. The protein
concentration in Edamame beans was in the range of 27.94–36.29%. A higher protein content
relative to the standard was noted in one sample - ‘Karikachi’ - 36.29%. Minimal accumulation
of oligosaccharides was noted in ‘Sac’ and ‘Astra’ cultivars, which indicates their suitability for
consumption. Promising cultivars were identified by the amount of fixed nitrogen - ‘Sac’
(168.00 ± 4.32 kg ha-1
), ‘Astra’ (161.67 ± 2.36 kg ha-1
) and SybNYYSOH 6 (158.19 ± 4.56 kg ha-1
).
The conducted regression analysis showed close relationships (from moderate to functional)
between various indicators of the development and productivity of the nodulation apparatus of
edamame cultivars. The evaluation of the collection cultivars of vegetable soybeans, their use
according to the variability of morphological features and productivity made it possible to single
out the ‘Sac’ among the introduced collection cultivars based on a set of valuable traits for use in
the selection process to create new cultivars of vegetable soybeans
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The Beam Line X NdFe-steel hybrid wiggler for SSRL
A wiggler magnet with 15 periods, each 12.85 cm long, which achieves 1.40 T at a 2.1 cm gap (2.26T at 0.8 cm) has been designed and is now in fabrication at LBL. This wiggler will be the radiation source of the high intensity synchrotron radiation beam line for the Beam Line X PRT facility at SSRL. The magnet utilizes Neodymium-Iron (NdFe) material and Vanadium Permendur (steel) in the hybrid configuration to achieve simultaneously a high magnetic field and short period. Magnetic field adjustment is with a driven chain and ball screw drive system. The magnetic structure is external to an s.s. vacuum chamber which has thin walls, 0.76 mm thickness, at each pole tip for higher field operation. Magnetic design, construction details and magnetic measurements are presented
Feeding of the elliptic flow by hard partons
We propose that in nuclear collisions at the LHC the elliptic flow may get a
contribution from leading hard and semihard partons which deposit energy and
momentum into the hydrodynamic bulk medium. The crucial effect is that these
partons induce wakes which interact and merge if they come together. The
contribution to the integrated elliptic flow is estimated with the help of a
toy model to about 25% of the observed value and shows strong event-by-event
fluctuations.Comment: 9 pages, 3 figure
Fast hadron freeze-out generator, part II: noncentral collisions
The fast Monte Carlo procedure of hadron generation developed in our previous
work is extended to describe noncentral collisions of nuclei. We consider
different possibilities to introduce appropriate asymmetry of the freeze-out
hyper-surface and flow velocity profile. For comparison with other models and
experimental data we demonstrate the results based on the standard
parametrizations of the hadron freeze-out hyper-surface and flow velocity
profile assuming either a common chemical and thermal freeze-out or the
chemically frozen evolution from chemical to thermal freeze-out. The C++
generator code is written under the ROOT framework and is available for public
use at http://uhkm.jinr.ru/Comment: 27 pages including 7 figures as EPS-files; prepared using LaTeX
package for publication in Physical Review
REE, Uranium (U) and Thorium (Th) contents in Betula pendula leaf growing around Komsomolsk gold concentration plant tailing (Kemerovo region, Western Siberia, Russia)
The article deals with the research findings of peculiarities of REE, Uranium and Thorium distribution in the territory surrounding the tailing of former Komsomolsk gold concentration plant according to the data from Betula pendula leaf testing. In the leaf element composition the slight deficiency of MREE and substantial excess of HREE are presented. In the nearest impacted area around the tailing, La, Yb, U and Th content, and Th/U ratio are lower than in the distant buffer area. It is shown, that value of Th/U ratio and REE can be an indicator for geochemical transformations of technogenic landscapes in mining districts. The results of the research can be used for biomonitoring of the territory around the tailing
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