A method for track reconstruction in the BM@N experiment, based on a constrained combinatorial search for track candidates, i.e. combinations of detector hits possibly belonging to a track, is ...presented. The algorithm has been implemented as a Vector Finder software toolkit containing track reconstruction procedures and tools to define hit acceptance windows (a priori constraints) for the track search. Track reconstruction results for simulated events of heavy-ion interactions are shown demonstrating the performance of the approach proposed.
Although oil and gas enterprises have specific technical and regulatory characteristics, the Running Lean concept, based on hypothesis testing and continual adaptation of business models, proves an ...effective means of optimizing and improving their performance. Adaptation of the Running Lean concept for oil and gas enterprises relies on collaboration with experts who understand their specific circumstances. It is important to track regulatory changes and to take account of relevant geopolitical factors. The present work assesses the prospects for developing business models at Russian oil and gas enterprises on the basis of the Running Lean concept.
Platform technologies may be regarded as an innovative tool for reducing the operating expenses of industrial enterprises. By introducing platform technologies at all stages of the production and ...business processes, Russian enterprises may integrate various information systems and ensure effective data transfer between them. The introduction of platform technologies improves the coordination and synchronization of different departments and processes within the enterprise and increases overall efficiency and performance. Overall, decreasing the operating costs makes an enterprise more efficient, competitive, and stable during market changes.
High energy physics experiments rely heavily on the detailed detector simulation models in many tasks. Running these detailed models typically requires a notable amount of the computing time ...available to the experiments. In this work, we demonstrate a new approach to speed up the simulation of the Time Projection Chamber tracker of the MPD experiment at the NICA accelerator complex. Our method is based on a Generative Adversarial Network – a deep learning technique allowing for implicit estimation of the population distribution for a given set of objects. This approach lets us learn and then sample from the distribution of raw detector responses, conditioned on the parameters of the charged particle tracks. To evaluate the quality of the proposed model, we integrate a prototype into the MPD software stack and demonstrate that it produces high-quality events similar to the detailed simulator, with a speed-up of at least an order of magnitude. The prototype is trained on the responses from the inner part of the detector and, once expanded to the full detector, should be ready for use in physics tasks.
Oxygen abundance maps of CALIFA galaxies Zinchenko, I. A; Pilyugin, L. S; Grebel, E. K ...
Monthly notices of the Royal Astronomical Society,
11/2016, Volume:
462, Issue:
3
Journal Article
Peer reviewed
Open access
We construct maps of the oxygen abundance distribution across the discs of 88 galaxies using Calar Alto Legacy Integral Field Area survey (CALIFA) Data Release 2 (DR2) spectra. The position of the ...centre of a galaxy (coordinates on the plate) was also taken from the CALIFA DR2. The galaxy inclination, the position angle of the major axis, and the optical radius were determined from the analysis of the surface brightnesses in the Sloan Digital Sky Survey (SDSS) g and r bands of the photometric maps of SDSS Data Release 9. We explore the global azimuthal abundance asymmetry in the discs of the CALIFA galaxies and the presence of a break in the radial oxygen abundance distribution. We found that there is no significant global azimuthal asymmetry for our sample of galaxies, i.e. the asymmetry is small, usually lower than 0.05 dex. The scatter in oxygen abundances around the abundance gradient has a comparable value, ≲0.05 dex. A significant (possibly dominant) fraction of the asymmetry can be attributed to the uncertainties in the geometrical parameters of these galaxies. There is evidence for a flattening of the radial abundance gradient in the central part of 18 galaxies. We also estimated the geometric parameters (coordinates of the centre, the galaxy inclination and the position angle of the major axis) of our galaxies from the analysis of the abundance map. The photometry-map-based and the abundance-map-based geometrical parameters are relatively close to each other for the majority of the galaxies but the discrepancy is large for a few galaxies with a flat radial abundance gradient.
We determine the radial abundance distributions across the discs of 14 irregular galaxies of the types Sm and Im (morphological T types 9 and 10) as traced by their H ii regions. The oxygen and ...nitrogen abundances in H ii regions are estimated through the T
e method or/and with the counterpart method (C method). Moreover, we examine the correspondence between the radial abundance gradient and the surface brightness profile. We find that irregular galaxies with a flat inner profile (flat or outwardly increasing surface brightness in the central region) show shallow (if any) radial abundance gradients. On the other hand, irregular galaxies with a steep inner profile (with or without a bulge or central star cluster) usually show rather steep radial abundance gradients. This is in contrast to the widely held belief that irregular galaxies do not usually show a radial abundance gradient.
Heavy-ion collisions at NICA energies provide a unique opportunity for the study of the production of hypernuclei in dense baryonic matter. In this paper, the details of the reconstruction procedure ...for hypertritons with the MPD detector in Bi + Bi collisions at NICA energies are presented.
A precision measurement of the ratio RK of the rates of kaon leptonic decays K±→e±ν and K±→μ±ν with the full data sample collected by the NA62 experiment at CERN in 2007–2008 is reported. The result, ...obtained by analysing ∼150000 reconstructed K±→e±ν candidates with 11% background contamination, is RK=(2.488±0.010)×10−5, in agreement with the Standard Model expectation.
DNA-Templated Silver Nanorings Zinchenko, A. A.; Yoshikawa, K.; Baigl, D.
Advanced materials (Weinheim),
12/2005, Volume:
17, Issue:
23
Journal Article
Peer reviewed
Monodisperse silver rings with nanometer‐scale diameters (see Figure) are produced due to the ability of DNA to organize into toroidal condensates with well‐defined shapes and sizes upon its ...interaction with multications. Silver ions can bind to the residual negative surface charge of condensed DNA, and are then reduced to silver metal to yield DNA toroids coated with a thin silver metal shell.
Genome-wide sequencing metadata allows researchers to infer bias in the relative frequencies of mutational events and to predict putative mutagenic models. In addition, much less data could be useful ...in the evaluation of the mutational frequency spectrum and the prevalent local mutagenic process. Here we analyzed the PAX6 gene locus for mutational spectra obtained in our own and previous studies and compared them with data on other genes as well as the whole human genome. MLPA and Sanger sequencing were used for mutation searching in a cohort of 199 index patients from Russia with aniridia and aniridia-related phenotypes. The relative frequencies of different categories of PAX6 mutations were consistent with those previously reported by other researchers. The ratio between substitutions, small indels, and chromosome deletions in the 11p13 locus was within the interval previously published for 20 disease associated genomic loci, but corresponded to a higher end due to very high frequencies of small indels and chromosome deletions. The ratio between substitutions, small indels, and chromosome deletions for disease associated genes, including the PAX6 gene as well as the share of PAX6 missense mutations, differed considerably from those typical for the whole genome.
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