109 research outputs found
The analysis of pi^{-} mesons produced in nucleus-nucleus collisions at a momentum of 4.5 GeV/c/nucleon in light front variables
The light front analysis of pi^{-} mesons in He(Li,C), C-Ne, C-Cu and O-Pb
collisions is carried out. The phase space of secondary pions is divided into
two parts in one of which the thermal equilibrium assumption seems to be in a
good agreement with the data. Corresponding temperatures T are extracted and
their dependence on (A_{P}*A_{T})^{1/2} is studied. The results are compared
with the predictions of the Quark-Gluon String Model (QGSM). The QGSM
satisfactorily reproduces the experimental data for light and intermediate-mass
nuclei.Comment: 14 pages with 9 postscript figure
Light-Front Analysis of pi^{-} Mesons Produced in Mg - Mg Collisions at 4.3 a Gev/c
Light-front analysis of pi^{-} mesons in Mg-Mg collisions is carried out. The
phase space of secondary pions is naturally divided into two parts in one of
which the thermal equilibration assumption seems to be in a good agreement with
data. Corresponding temperatures are extracted and compared to the results of
other experiments. The experimental results have been compared with the
predictions of the Quark Gluon String Model (QGSM) and satisfactory agreement
between the experimental data and the model has been found.Comment: 14 pages with 7 postscript figures. accepted for publication in Nucl.
Phys.
The Light Front Analysis of pi^{-} Mesons Produced in the Relativistic Nucleus-Nucleus Collisions
The light front analysis of pi^{-} mesons in A_{P} (He, C, Mg, O) + A_{T}
(Li,C, Ne, Mg,Cu,Pb) collisions is carried out. The phase space of secondary
pions is naturally divided into two parts in one of which the thermal
equilibration assumption seems to be in a good agreement with data.
Corresponding temperatures are extracted and compared to the results of other
experiments. The dependence of the average temperature T on (A_{P}*A_{T})^{1/2}
is studied.Comment: 15 pages with 13 postscript figure
A study of Lambda-production in central nucleus-nucleus interactions at a momentum of 4.5 GeV/c per incident nucleon
Eta-mesic nuclei in relativistic mean-field theory
With the eta-nucleon (eta N) interaction Lagrangian deduced from chiral
perturbation theory, we study the possible eta-mesic nuclei in the framework of
relativistic mean-field theory. The eta single-particle energies are sensitive
to the eta N scattering length, and increase monotonically with the nucleon
number A. If the scattering length is in the range of a^{eta N}=0.75-1.05 fm
and the imaginary potential V_{0}-15 MeV, some discrete states of C, O and Ne
eta bound states should be identified in experiments. However, when the
scattering length a^{eta N} 30 MeV,
no discrete eta meson bound states could be observed in experiments.Comment: 6 page
Differential Transverse Flow in Central C-Ne and C-Cu Collisions at 3.7 GeV/nucleon
Differential transverse flow of protons and pions in central C-Ne and C-Cu
collisions at a beam energy of 3.7 GeV/nucleon was measured as a function of
transverse momentum at the SKM-200-GIBS setup of JINR. In agreement with
predictions of a transversely moving thermal model, the strength of proton
differential transverse flow is found to first increase gradually and then
saturate with the increasing transverse momentum in both systems. While pions
are preferentially emitted in the same direction of the proton transverse flow
in the reaction of C-Ne, they exhibit an anti-flow to the opposote direction of
the proton transverse flow in the reaction of C-Cu due to stronger shadowing
effects of the heavier target in thr whole range of transverse momentum.Comment: 15 pages, 5 figure
Homobivalent Lamellarin-Like Schiff Bases: In Vitro Evaluation of Their Cancer Cell Cytotoxicity and Multitargeting Anti-Alzheimer's Disease Potential
Marine alkaloids belonging to the lamellarins family, which incorporate a 5,6-dihydro-1-phenylpyrrolo[2,1-a]isoquinoline (DHPPIQ) moiety, possess various biological activities, spanning from antiviral and antibiotic activities to cytotoxicity against tumor cells and the reversal of multidrug resistance. Expanding a series of previously reported imino adducts of DHPPIQ 2-carbaldehyde, novel aliphatic and aromatic Schiff bases were synthesized and evaluated herein for their cytotoxicity in five diverse tumor cell lines. Most of the newly synthesized compounds were found noncytotoxic in the low micromolar range (<30 μM). Based on a Multi-fingerprint Similarity Search aLgorithm (MuSSeL), mainly conceived for making protein drug target prediction, some DHPPIQ derivatives, especially bis-DHPPIQ Schiff bases linked by a phenylene bridge, were prioritized as potential hits addressing Alzheimer's disease-related target proteins, such as cholinesterases (ChEs) and monoamine oxidases (MAOs). In agreement with MuSSeL predictions, homobivalent para-phenylene DHPPIQ Schiff base 14 exhibited a noncompetitive/mixed inhibition of human acetylcholinesterase (AChE) with Ki in the low micromolar range (4.69 μM). Interestingly, besides a certain inhibition of MAO A (50% inhibition of the cell population growth (IC50) = 12 μM), the bis-DHPPIQ 14 showed a good inhibitory activity on self-induced β-amyloid (Aβ)1-40 aggregation (IC50 = 13 μM), which resulted 3.5-fold stronger than the respective mono-DHPPIQ Schiff base 9
Polarization of Lambda^0 hyperons in nucleus-nucleus collisions at high energies
The measurement of Lambda^0 hyperons polarization in nucleus-nucleus
collisions is considered as one of possible tools to study the phase
transition. Fixed target and collider experiments are discussed for the case of
Lambda^0's production from Au-Au central collisions at \sqrt{s_{NN}} of several
GeV.Comment: 15 pages, 6 figure
ВЛИЯНИЕ СОСТАВА ТОРФОБРИКЕТОВ НА ФОРМИРОВАНИЕ РАССАДЫ ОГУРЦА В ИНТЕНСИВНОЙ СВЕТОКУЛЬТУРЕ
Obtaining high-quality seedlings is an essential condition for growing vegetables in modern cultivation facilities of protected ground. The influence of the composition and properties of peat briquettes on the growth and development of hybrid F1 of cucumber Zozulya seedlings, indicators of plant leaves photosynthetic activity, their net productivity in cultivation under controlled conditions of intensive light culture were investigated. It is shown how the change in the composition of peat briquettes affects their hydrophysical properties: volume, density, moisture absorbing capacity, etc., which is reflected in the state of cucumber seedlings. Thus, for the grown cucumber seedlings, peat briquettes had more favorable hydrophysical properties, which included, in addition to neutralized peat, Cambrian clay, separately or in combination with straw in the amount of 10% of the peat volume, or with sapropel. The moisture absorbing capacity in the considered peat briquettes was optimal for growing plants in conditions of intensive light culture and ranged from 617 to 774%. Optimization of the hydrophysical properties of peat briquettes was positively reflected in the photosynthetic activity of the leaves. The photosynthetic potential increased by 20-29%, the leaf surface area – by 19-40%; net productivity of plants photosynthesis – by 0.6-3.2 g/m2 per day, which eventually led to the formation of plants with a higher biomass – by 10-48%. An increase in the content of straw in the peat briquette to 20% led to a decrease in the moisture absorbing capacity of the peat briquette, which contributed to a certain deterioration in the physiological state of plants and, as a consequence, to a tendency towards to reduce the mass of plant seedlings.Получение качественной рассады является неотъемлемым условием при выращивании овощных культур в современных культивационных сооружениях защищенного грунта. Исследовано влияние состава и свойств торфобрикетов на рост и развитие рассады гибрида F1 огурца Зозуля, показатели фотосинтетической активности листьев растений, их нетто-продуктивность при культивировании в регулируемых условиях интенсивной светокультуры. Показано, как изменение состава торфобрикетов влияет на их гидрофизические свойства: объем, плотность, водопоглощающую способность и др., что отражается на состоянии рассады огурца. Так, для выращиваемой рассады огурца более благоприятными гидрофизическими свойствами обладали торфобрикеты, в состав которых кроме нейтрализованного торфа входили кембрийская глина, отдельно или в сочетании с соломой в количестве 10% от объема торфа, или с сапропелем. Влагопоглощающая способность в рассматриваемых торфобрикетах была оптимальной для выращивания растений в условиях интенсивной светокультуры и находилась в диапазоне от 617 до 774%. Оптимизация гидрофизических свойств торфобрикетов, положительным образом отражалась на показателях фотосинтетической деятельности листьев. Фотосинтетический потенциал увеличивался на 20-29%, площадь листовой поверхности листьев возрастала на 19-40%; чистая продуктивность фотосинтеза растений – на 0,6-3,2 г/м2 сутки, что в конечном итоге приводило к формированию растений с более высокой биомассой – на 10- 48%. Увеличение содержания соломы в торфобрикете до 20% приводило к снижению влагопоглощающей способности торфобрикета, что способствовало некоторому ухудшению физиологического состояния растений и, как следствие, проявлению тенденции к снижению массы рассады растений
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