Measurement Of The Σ̄- Lifetime And Direct Comparison With The Σ+ Lifetime

We have measured the lifetime of the Σ̄- using the Fermilab Proton Center 375 GeV/c charged hyperon beam. We obtained (80.43±0.80±0.14) ps. We also measured the lifetime of the Σ+, obtaining (80.38 ±0.40±0.14) ps, in agreement with the Particle Data Group value. A direct comparison between the two lifetimes from the ratio of the decay curves gives a fractional lifetime difference of Δτ/τ=(-0.06±1.12)%, consistent with equal lifetimes for baryon and antibaryon as required by CPT invariance. ©1999 The American Physical Society.61314Foucher, M., (1992) Phys. Rev. Lett., 68, p. 3004Timm, S., (1995) Phys. Rev. D, 51, p. 4638Dubbs, T., (1994) Phys. Rev. Lett., 72, p. 808Caso, C., (1998) Eur. Phys. J. C, 3, p. 690(1993) GEANT 3.21 CERN Program Library W5103, , CERNKuropatkin, N., private communicationLangland, J.L., (1995) Hyperon and Antihyperon Production in P-Cu Interactions, , Ph.D. thesis, University of IowaMorelos, A., (1993) Phys. Rev. Lett., 71, p. 341

Comissioning of the linear accelerator-injector at the TNK facility

The industrial storage facility has been developed and manufactured at the Budker INP SB RAS. It contains an 80 MeV electron linear accelerator-injector and two electron storage rings: the lesser 450 MeV booster ring and the main 2.5 GeV storage ring. In 2002, the work on the accelerator assembling was begun. On December, 25 this year the accelerator was started up, and the current at the linear accelerator output was obtained. The linear accelerator schematic together with a description of the 6 meter long accelerating DAW structure which operates at 2.8 GHz, are presented in the paper. The first results of the accelerator start-up are as follows: the accelerated electron current of ~50 mA with the energy of ~55...60 MeV.Технологічний накопичувальний комплекс був спроектований і виготовлений у ІЯФ ім. Г.І. Будкера СВ РАН. Він містить у собі інжектор–лінійний прискорювач електронів з енергією до 80 МеВ і два накопичувачі електронів: малий накопичувач–бустер на енергію 450 МеВ і основний накопичувач на енергію 2.5 ГеВ. Приводяться функціональна схема лінійного прискорювача й опис конструкції прискорюючої структури із шайбами і діафрагмами довжиною 6 м, що працює на частоті 2.8 ГГц.Представлено перші результати запуску прискорювача: отриманий прискорений струм електронів ~50 мА з енергією ~(55...60) МеВ.Технологический накопительный комплекс был спроектирован и изготовлен в ИЯФ им. Г.И. Будкера СО РАН. Он включает в себя инжектор–линейный ускоритель электронов с энергией до 80 МэВ и два накопителя электронов: малый накопитель–бустер на энергию 450 МэВ и основной накопитель на энергию 2.5 ГэВ. Приводятся функциональная схема линейного ускорителя и описание конструкции ускоряющей структуры с шайбами и диафрагмами длиной 6 метров, работающей на частоте 2.8 ГГц. Представлены первые результаты запуска ускорителя: получен ускоренный ток электронов ~50 мA с энергией ~(55...60) МэВ

Thermodynamic characteristics of phase interaction during melting of cast iron under conditions of temperature fluctuations

The article represents a thermodynamic analysis of phase interaction during cast iron melting in cupola and electric furnaces at foundry. The author has studied the influence of the components’ activities on the cast iron melting in various compositions of the interacting phases corresponding to the melting conditions in cupola, induction and arc furnaces. The influence of each factor on the phase interaction has been studied in the presence of temperature fluctuations. The effect of the components’ activities on the Gibbs free energy in both the equilibrium conditions and the presence of temperature fluctuations have been determined. This is particularly essential when contacting with the molten metal, slag and carbon. The influence of temperature fluctuation on the interaction of the metal with the gas phase, slag and carbonic solid materials has been revealed. The conditions of cast iron melting can be characterized by the presence of temperature fluctuations disturbing the equilibrium of the process. Temperature macrofluctuations with a significant relaxation time can be observed in arc furnaces. Such macrofluctuations can be considered as the spatial temporal heterogeneity of the temperature field. There are also temperature fluctuations in gas flame. Temperature fluctuations occur upon contact of metal drops with hot surface of coke lumps. Based on the research, a fundamentally new design of gas cupola furnace with heterogeneous fire-resistant bed charge has been developed, patented and introduced. © 2017, National University of Science and Technology MISIS. All rights reserved

Thermodynamic characteristics of phase interaction during melting of cast iron under conditions of temperature fluctuations

The article represents a thermodynamic analysis of phase interaction during cast iron melting in cupola and electric furnaces at foundry. The author has studied the influence of the components’ activities on the cast iron melting in various compositions of the interacting phases corresponding to the melting conditions in cupola, induction and arc furnaces. The influence of each factor on the phase interaction has been studied in the presence of temperature fluctuations. The effect of the components’ activities on the Gibbs free energy in both the equilibrium conditions and the presence of temperature fluctuations have been determined. This is particularly essential when contacting with the molten metal, slag and carbon. The influence of temperature fluctuation on the interaction of the metal with the gas phase, slag and carbonic solid materials has been revealed. The conditions of cast iron melting can be characterized by the presence of temperature fluctuations disturbing the equilibrium of the process. Temperature macrofluctuations with a significant relaxation time can be observed in arc furnaces. Such macrofluctuations can be considered as the spatial temporal heterogeneity of the temperature field. There are also temperature fluctuations in gas flame. Temperature fluctuations occur upon contact of metal drops with hot surface of coke lumps. Based on the research, a fundamentally new design of gas cupola furnace with heterogeneous fire-resistant bed charge has been developed, patented and introduced. © 2017, National University of Science and Technology MISIS. All rights reserved

Landfills: Problems, solutions and decision-making of waste disposal in Harare (Zimbabwe)

Selection of a suitable site for constructing a new landfill is one of the most challenging issues for town planners in developing countries. A study was conducted to locate the most suitable site for constructing a sanitary landfill in the city of Harare using Geospatial techniques and Multi-Criteria Evaluation. To identify appropriate landfill sites, nine input map layers including proximity to settlements/built up area, proximity to protected areas, proximity to airports, proximity to road and railway networks, surface water, slope, elevation and soil type were used for mapping, analysis and evaluation. Each criterion was identified and weighted using Analytic Hierarchy Process. A final map was generated which identified potential areas for the location of a landfill site. Results revealed that 1.31% of the total area of Harare was identified as mostly suitable, 24.73% as moderately suitable to suitable and 76.96% as unsuitable to construct a sanitary landfill. Six sites were identified as most suitable sites for a landfill. These selected sites require further geotechnical and hydrogeological analyses to identify the final site in the city to construct a sanitary landfill

Development of ?redictive ?mission ?onitoring systems

An overview of world experience in the development and implementation of emission monitoring systems for industrial enterprises, based on mathematical models is presented. The main problems of such systems have been analyzed, their advantages and disadvantages have been revealed. The authors have demonstrated that at Russian enterprises, the introduction of predictive emission monitoring systems was possible at the initial stages of transition to BAT as part of the digital technologies' integration in production processes. © 2020 Izdatel'stvo Kalvis. All rights reserved