137 research outputs found

    Electromagnetic and Gravitational Radiation of Graviatoms

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    Graviatom existence conditions have been found. The graviatoms (quantum systems around mini-black-holes) satisfying these conditions contain the following charged particles: the electron, muon, tau lepton, wino, pion and kaon. Electric dipole and quadrupole and gravitational radiations are calculated for the graviatoms and compared with Hawking's mini-hole radiation.Comment: 7 pages, 1 figure, 3 tables; accepted in "Astronomical and Astrophysical Transactions

    Critical sound attenuation in a diluted Ising system

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    The field-theoretic description of dynamical critical effects of the influence of disorder on acoustic anomalies near the temperature of the second-order phase transition is considered for three-dimensional Ising-like systems. Calculations of the sound attenuation in pure and dilute Ising-like systems near the critical point are presented. The dynamical scaling function for the critical attenuation coefficient is calculated. The influence of quenched disorder on the asymptotic behaviour of the critical ultrasonic anomalies is discussed.Comment: 12 RevTeX pages, 4 figure

    Positron annihilation spectroscopy of vacancy-type defects hierarchy in submicrocrystalline nickel during annealing

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    Positron annihilation and X-ray diffraction analysis have been used to study submicrocrystalline nickel samples prepared by equal channel angular pressing. In the as-prepared samples the positrons are trapped at dislocation-type defects and in vacancy clusters that can include up to 5 vacancies. The study has revealed that the main positron trap centers at the annealing temperature of deltaT= 20Β°C-180Β°C are low-angle boundaries enriched by impurities. At deltaT = 180Β°C-360Β°C, the trap centers are low-angle boundaries providing the grain growth due to recrystallization in-situ

    Experimental study of direct photon emission in K- --> pi- pi0 gamma decay using ISTRA+ detector

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    The branching ratio in the charged-pion kinetic energy region of 55 to 90 MeV for the direct photon emission in the K- --> pi- pi0 gamma decay has been measured using in-flight decays detected with the ISTRA+ setup operating in the 25 GeV/c negative secondary beam of the U-70 PS. The value Br(DE)=[0.37+-0.39(stat)+-0.10(syst)]*10^(-5) obtained from the analysis of 930 completely reconstructed events is consistent with the average value of two stopped-kaon experiments, but it differs by 2.5 standard deviations from the average value of three in-flight-kaon experiments. The result is also compared with recent theoretical predictions.Comment: 13 pages, 8 figure

    Modelling effects of phytobiotic administration on coherent responses to Salmonella infection in laying hens

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    Practice of layer poultry farming and commercial egg production relies on the optimal use and improvement of the welfare and genetically determined functional abilities of laying hens, their efficient intake of feed and its components, adaptation to housing conditions and resistance to infectious diseases including salmonellosis. Previous studies were focussed on relationships of chicken performance and resistance with the expression profiles of individual genes involved in metabolic processes and immune system, or with genetic markers that can be closely associated with these processes in chickens. In this study, mathematical models of coherent changes in laying hens were developed for the expression of eight genes involved in immunity and metabolism, on the one hand, and biochemical and immunological blood parameters, on the other hand, in response to Salmonella infection and administration of a phytobiotic Intebio. The proposed modelling approach can be a further basis for an in-depth research of the relationship between the gene expression, functional state and welfare of poultry, impact of pathogenic microorganisms and use of immunomodulatory drugs

    [Changing the intestinal microbiota of chickens in ontogenesis] ИзмСнСниС ΠΌΠΈΠΊΡ€ΠΎΠ±ΠΈΠΎΡ‚Ρ‹ ΠΊΠΈΡˆΠ΅Ρ‡Π½ΠΈΠΊΠ° ΠΊΡƒΡ€ Π² ΠΎΠ½Ρ‚ΠΎΠ³Π΅Π½Π΅Π·Π΅

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    This paper presents the results of a molecular genetic analysis of the changes in the composition of the microbiota of the blind processes of the intestine of the hens of the industrial loam "Lohmann Brown" during ontogeny. According to the results of the analysis of taxonomic affiliation it is established that over 70% of the phylotypes belong to the three phylums - Firmicutes, Bacteroidetes and Proteobacteria, less represented were Actinobacteria, Tenericutes and Fusobacteria, and a significant number of unidentified bacteria was detected. During ontogenesis, birds exhibited marked changes in the ratio of the number of phylotypes and taxonomic groups of the intestinal microbiota. At the age of 20-40 weeks, the birds showed a significant increase in the representatives of the Clostridia class involved in the metabolism of carbohydrates, acid-utilizing bacteria of the order Negativicutes and bacteria with high antagonistic properties (Bifidobacteriales, Bacillus), as well as a significant decrease in the content of a number of opportunistic and pathogenic taxa - family Enterobacteriaceae, the order of Pseudomonadales, phylum Tenericutes. The greatest homogeneity of the bacterial community of the blind processes of the gastrointestinal tract in laying hens was revealed at the age of 20 weeks, which is confirmed by the estimation of biodiversity by means of ecological indices. Π’ настоящСм исслСдовании прСдставлСны Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Ρ‹ молСкулярно-гСнСтичСского Π°Π½Π°Π»ΠΈΠ·Π° измСнСния состава ΠΌΠΈΠΊΡ€ΠΎΠ±ΠΈΠΎΡ‚Ρ‹ слСпых отростков ΠΊΠΈΡˆΠ΅Ρ‡Π½ΠΈΠΊΠ° ΠΊΡƒΡ€ ΠΏΡ€ΠΎΠΌΡ‹ΡˆΠ»Π΅Π½Π½ΠΎΠ³ΠΎ кросса Β«Π›ΠΎΠΌΠ°Π½Π½ Π‘Ρ€Π°ΡƒΠ½Β» Π² Ρ‚Π΅Ρ‡Π΅Π½ΠΈΠ΅ ΠΎΠ½Ρ‚ΠΎΠ³Π΅Π½Π΅Π·Π°. По Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Π°ΠΌ Π°Π½Π°Π»ΠΈΠ·Π° таксономичСской принадлСТности установлСно, Ρ‡Ρ‚ΠΎ ΡΠ²Ρ‹ΡˆΠ΅ 70% Ρ„ΠΈΠ»ΠΎΡ‚ΠΈΠΏΠΎΠ² относится ΠΊ Ρ‚Ρ€Π΅ΠΌ Ρ„ΠΈΠ»ΡƒΠΌΠ°ΠΌ - Firmicutes, Bacteroidetes ΠΈ Proteobacteria, ΠΌΠ΅Π½Π΅Π΅ прСдставлСны Π±Ρ‹Π»ΠΈ Actinobacteria, Tenericutes ΠΈ Fusobacteria, Π° Ρ‚Π°ΠΊΠΆΠ΅ выявлСно присутствиС Π·Π½Π°Ρ‡ΠΈΡ‚Π΅Π»ΡŒΠ½ΠΎΠ³ΠΎ количСства Π½Π΅ΠΈΠ΄Π΅Π½Ρ‚ΠΈΡ„ΠΈΡ†ΠΈΡ€ΠΎΠ²Π°Π½Π½Ρ‹Ρ… Π±Π°ΠΊΡ‚Π΅Ρ€ΠΈΠΉ. Π’ Ρ‚Π΅Ρ‡Π΅Π½ΠΈΠ΅ ΠΎΠ½Ρ‚ΠΎΠ³Π΅Π½Π΅Π·Π° Ρƒ ΠΏΡ‚ΠΈΡ† наблюдались Π·Π°ΠΌΠ΅Ρ‚Π½Ρ‹Π΅ измСнСния ΡΠΎΠΎΡ‚Π½ΠΎΡˆΠ΅Π½ΠΈΡ количСства Ρ„ΠΈΠ»ΠΎΡ‚ΠΈΠΏΠΎΠ² ΠΈ таксономичСских Π³Ρ€ΡƒΠΏΠΏ ΠΌΠΈΠΊΡ€ΠΎΠ±ΠΈΠΎΡ‚Ρ‹ ΠΊΠΈΡˆΠ΅Ρ‡Π½ΠΈΠΊΠ°. Π’ возрастС 20-40 нСдСль Ρƒ ΠΏΡ‚ΠΈΡ† ΠΎΡ‚ΠΌΠ΅Ρ‡Π΅Π½ΠΎ достовСрноС ΡƒΠ²Π΅Π»ΠΈΡ‡Π΅Π½ΠΈΠ΅ прСдставитСлСй класса Clostridia, ΡƒΡ‡Π°ΡΡ‚Π²ΡƒΡŽΡ‰ΠΈΡ… Π² ΠΌΠ΅Ρ‚Π°Π±ΠΎΠ»ΠΈΠ·ΠΌΠ΅ ΡƒΠ³Π»Π΅Π²ΠΎΠ΄ΠΎΠ², кислот-ΡƒΡ‚ΠΈΠ»ΠΈΠ·ΠΈΡ€ΡƒΡŽΡ‰ΠΈΡ… Π±Π°ΠΊΡ‚Π΅Ρ€ΠΈΠΉ порядка Negativicutes ΠΈ Π±Π°ΠΊΡ‚Π΅Ρ€ΠΈΠΉ с высокими антагонистичСскими свойствами (Bifidobacteriales, Bacillus), Π° Ρ‚Π°ΠΊΠΆΠ΅ достовСрноС сниТСниС содСрТания ряда условно-ΠΏΠ°Ρ‚ΠΎΠ³Π΅Π½Π½Ρ‹Ρ… ΠΈ ΠΏΠ°Ρ‚ΠΎΠ³Π΅Π½Π½Ρ‹Ρ… таксонов – сСмСйства Enterobacteriaceae, порядка Pseudomonadales, Ρ„ΠΈΠ»ΡƒΠΌΠ° Tenericutes. Наибольшая ΠΎΠ΄Π½ΠΎΡ€ΠΎΠ΄Π½ΠΎΡΡ‚ΡŒ Π±Π°ΠΊΡ‚Π΅Ρ€ΠΈΠ°Π»ΡŒΠ½ΠΎΠ³ΠΎ сообщСства слСпых отростков Π–ΠšΠ’ Ρƒ Π½Π΅ΡΡƒΡˆΠ΅ΠΊ выявлСна Π² 20-нСдСльном возрастС, Ρ‡Ρ‚ΠΎ подтвСрТдаСтся ΠΎΡ†Π΅Π½ΠΊΠΎΠΉ биоразнообразия ΠΏΡ€ΠΈ ΠΏΠΎΠΌΠΎΡ‰ΠΈ экологичСских индСксов

    Observation of the radiative kaon decay K- --> mu-pi0gammanu

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    Using data collected with the ISTRA+ spectrometer during the 2001 run of the U-70 proton synchrotron in Protvino, we report the first observation of the radiative kaon decay K- -->mu-pi0gammanu. We find Br(Kmu3g)/Br(Kmu3) for two regions 5<Eg<30 and 30<Eg<60 MeV consistent with theoretical predictions. The measured angular distribution asymmetry for the first region, 0.093+/-0.141, is two standard deviations away from the theoretical prediction of 0.354. The measured asymmetry in the T-odd variable is -0.03+/-0.13.Comment: 15 pages, 8 figurs, submitted to Yadernaya Fizik

    Removing leakage-induced correlated errors in superconducting quantum error correction

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    Quantum computing can become scalable through error correction, but logical error rates only decrease with system size when physical errors are sufficiently uncorrelated. During computation, unused high energy levels of the qubits can become excited, creating leakage states that are long-lived and mobile. Particularly for superconducting transmon qubits, this leakage opens a path to errors that are correlated in space and time. Here, we report a reset protocol that returns a qubit to the ground state from all relevant higher level states. We test its performance with the bit-flip stabilizer code, a simplified version of the surface code for quantum error correction. We investigate the accumulation and dynamics of leakage during error correction. Using this protocol, we find lower rates of logical errors and an improved scaling and stability of error suppression with increasing qubit number. This demonstration provides a key step on the path towards scalable quantum computing

    [Mathematical assessment of BAC-based interspecies hybridization data in the process of genomic mapping in the white-throated sparrow as an avian behavioral model] ΠœΠ°Ρ‚Π΅ΠΌΠ°Ρ‚ΠΈΡ‡Π΅ΡΠΊΠ°Ρ ΠΎΡ†Π΅Π½ΠΊΠ° Π΄Π°Π½Π½Ρ‹Ρ… ΠΌΠ΅ΠΆΠ²ΠΈΠ΄ΠΎΠ²ΠΎΠΉ Π‘ΠΠš-Π³ΠΈΠ±Ρ€ΠΈΠ΄ΠΈΠ·Π°Ρ†ΠΈΠΈ Π² процСссС Π³Π΅Π½ΠΎΠΌΠ½ΠΎΠ³ΠΎ картирования Ρƒ бСлошСйной Π·ΠΎΠ½ΠΎΡ‚Ρ€ΠΈΡ…ΠΈΠΈ ΠΊΠ°ΠΊ ΠΌΠΎΠ΄Π΅Π»ΠΈ повСдСния ΠΏΡ‚ΠΈΡ†

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    The white-throated sparrow (Zonotrichia albicollis) known for its morphological, behavioral and chromosomal polymorphisms represents a quite new model system to study genomic mechanisms underlying variable behavioral repertoire interwoven with population biology, reproduction and adaptation in this species. It was previously shown that these polymorphisms could be due to chromosomal rearrangements (inversions) on sparrow chromosome 2 (ZAL2) that is characterized by a heterogeneity in two distinct morphs, tan (ZAL2/ZAL2) and white (ZAL2/ZAL2m). To construct a comparative genomic map of ZAL2 and other chromosomes, we used a sparrow genomic BAC library, CHORI-264. Following a cross-species overgo hybridization approach, we screened the library and developed a first-generation BAC-based comparative physical map using the chicken and zebra finch reference genomes. The map includes 640 BAC-gene assignments for 77 loci and serves for further refining the genomic regions and identifying candidate genes that are affected by rearrangements and contribute to the observed behavioral polymorphisms. Mathematical assessment of the BAC-based hybridization data was undertaken to show evolutionary relationships of avian genomes. Π’ настоящСй Ρ€Π°Π±ΠΎΡ‚Π΅ прСдставлСна матСматичСская ΠΎΡ†Π΅Π½ΠΊΠ° ΠΌΠ΅ΠΆΠ²ΠΈΠ΄ΠΎΠ²ΠΎΠΉ Π‘ΠΠš-Π³ΠΈΠ±Ρ€ΠΈΠ΄ΠΈΠ·Π°Ρ†ΠΈΠΈ Π² процСссС Π³Π΅Π½ΠΎΠΌΠ½ΠΎΠ³ΠΎ картирования Ρƒ бСлошСйной Π·ΠΎΠ½ΠΎΡ‚Ρ€ΠΈΡ…ΠΈΠΈ – Π²ΠΈΠ΄Π° Π²ΠΎΡ€ΠΎΠ±ΡŒΠ΅Π², рассматриваСмого Π² качСствС ΡƒΠ΄ΠΎΠ±Π½ΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ повСдСния ΠΏΡ‚ΠΈΡ†
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