Flame front propagation IV: Random Noise and Pole-Dynamics in Unstable Front Propagation II

The current paper is a corrected version of our previous paper arXiv:adap-org/9608001. Similarly to previous version we investigate the problem of flame propagation. This problem is studied as an example of unstable fronts that wrinkle on many scales. The analytic tool of pole expansion in the complex plane is employed to address the interaction of the unstable growth process with random initial conditions and perturbations. We argue that the effect of random noise is immense and that it can never be neglected in sufficiently large systems. We present simulations that lead to scaling laws for the velocity and acceleration of the front as a function of the system size and the level of noise, and analytic arguments that explain these results in terms of the noisy pole dynamics.This version corrects some very critical errors made in arXiv:adap-org/9608001 and makes more detailed description of excess number of poles in system, number of poles that appear in the system in unit of time, life time of pole. It allows us to understand more correctly dependence of the system parameters on noise than in arXiv:adap-org/9608001Comment: 23 pages, 4 figures,revised, version accepted for publication in journal "Combustion, Explosion and Shock Waves". arXiv admin note: substantial text overlap with arXiv:nlin/0302021, arXiv:adap-org/9608001, arXiv:nlin/030201

Test of an LED Monitoring System for the PHOS Spectrometer

Preprint submitted to Elsevier Print on 26th January 2000A prototype monitoring system for the Photon Spectrometer (PHOS) of the ALICE experiment at LHC is described in detail. The prototype consists of Control and Master modules. The first one is 8x8 matrix of Light Emitting Diodes coupled with stable generators of current pulses. The system provides an individual control for each of the 64 channels of PHOS prototype based on lead-tungstate crystals. A long term stability of order of 10-3 has been achieved in integral beam tests of the monitoring system and PHOS prototypes

Capabilities of the GAMMA-400 gamma-ray telescope to detect gamma-ray bursts from lateral directions

The currently developing space-based gamma-ray telescope GAMMA-400 will measure the gamma-ray and electrons + positrons fluxes using the main top-down aperture in the energy range from ~20 MeV to several TeV in the highly elliptic orbit (without shadowing the telescope by the Earth and outside the radiation belts) continuously for a long time. The instrument will provide fundamentally new data on discrete gamma-ray sources, gamma-ray bursts (GRBs), sources and propagation of Galactic cosmic rays and signatures of dark matter due to its unique angular and energy resolutions in the wide energy range. The gamma-ray telescope consists of the anticoincidence system (AC), the converter-tracker (C), the time-of-flight system (S1 and S2), the position-sensitive and electromagnetic calorimeters (CC1 and CC2), the top and bottom scintillation detectors of the calorimeter (S3 and S4) and lateral detectors of the calorimeter (LD). In this paper, the capabilities of the GAMMA-400 gamma-ray telescope to measure fluxes of GRBs from lateral directions of CC2 are analyzed using Monte-Carlo simulations. The analysis is based on second-level trigger construction using signals from S3, CC2, S4 and LD detectors. For checking the numerical algorithm the data from space-based GBM and LAT instruments of the Fermi experiment are used, namely, three long bursts: GRB 080916C, GRB 090902B, GRB 090926A and one short burst GRB 090510A. The obtained results allow us to conclude that from lateral directions the GAMMA-400 space-based gamma-ray telescope will reliably measure the spectra of bright GRBs in the energy range from ~10 to ~100 MeV with the effective area of about 0.13 m2 (for each of the four sides of CC2) and total field of view of about 6 sr.Comment: 19 pages, 18 figures, the paper will be submitted to Advances in Space Researc

ВЫБОР ДНК МАТРИЦЫ ДЛЯ ОБОСНОВАНИЯ ПОРОГОВОГО УРОВНЯ ТЕХНИЧЕСКИ НЕУСТРАНИМЫХ ПРИМЕСЕЙ МЯСА ПТИЦЫ В ГОТОВОЙ МЯСНОЙ ПРОДУКЦИИ

 Differentiation between adulteration and accidental meat raw material contamination in meat industry enterprises that carry out the combined processing of slaughtering products from farm animals and poultry is necessary to establish a threshold of technically non-removable impurities. Justification of the thresholds, e.g. for chicken meat, requires determination of the target analytical matrix, which content in meat raw material is stable. In the Russian certified methods, the species-specific DNA matrix for chickens is a multi-copy gene of cytochrome B in mitochondrial DNA. Taking into consideration that mitochondrial DNA copy number can depend on a muscle fiber type, animal age, and other factors, the effectiveness of using multi-copy mitochondrial genes for quantifying the poultry content in meat products was justified in this study. Analysis of the samples from the pectoral and hip muscles of three chicken carcasses and one duck carcass obtained from different manufacturers showed that the poultry pectoral and hip muscles contained approximately equal amounts of mitochondrial DNA, which allows its use as a matrix to justify the level of technically non-removable chicken impurities in finished meat products.  Дифференциация факта фальсификации от случайной перекрестной контаминации сырья на предприятиях мясной промышленности, осуществляющих совместную переработку продуктов убоя сельскохозяйственных животных и птицы, необходима для установления порогового уровня технически неустранимой примеси. Обоснование пороговых значений, например, мяса кур, требует определения целевой аналитической матрицы, содержание которой в мясном сырье стабильно. В российских аттестованных методиках видоспецифической матрицей выявления ДНК кур является многокопийный ген митохондриальной ДНК цитохрома Б. Учитывая, что копийность митохондриальной ДНК может зависеть от типа мышечных волокон, возраста животных и других факторов в данном исследовании обоснована эффективность использования многокопийных митохондриальных генов для квантификации содержания мяса птицы в мясных продуктах. Исследование проб мяса 3 образцов тушек кур разных производителей и 1 образца тушки утки, выделенных из грудных и бедренных мышц показало, что в грудных и бедренных мышцах сельскохозяйственных птиц содержится приблизительно равное количество митохондриальной ДНК, что позволяет ее использовать в качестве матрицы для обоснования уровня технически неустранимой примеси готовой мясной продукции мясом кур.