Перспективы применения наукоёмких микроволновых технологий
Theoretical and experimental results of heat curing of concrete using ultra-high frequency electromagnetic energy as a source of heat are presented. The advantages of microwave method of heat curing of concrete are compared with traditional methods. The results of studies on the accelerated curing of concrete slabs in a beam-type microwave setup are presented.
A beam-type microwave setupwas developed to accelerate the curing the concrete slab, with the size of 200 mm x 2000 mm x 3000 mm, weight 2760 kg at the temperature of +70°C and the electromagnetic field frequency oscillations of 2450 MHz, and power output of 38.4 kW. A setup allows to reduce the energy consumption for the technological process of the heat treatment of concrete products, increase productivity and improve working conditions for the staff. Basic expressions for the temperature distribution calculation along the thickness and the surface ofconcrete slabs are presented. The time of heating a slabto the temperature of +70°C, 2760 kg of weight, was 50 minutes. The deviation from the nominal value of the temperature of the concrete slab across the area doesn't exceed 2°C, and across the thickness of the plate does not exceed 5°C. As a result, the research shows the prospects of using microwave radiation for the production processes associated with accelerated hardening of the concrete. Currently work is underway to improve the strength characteristics of concrete due to uniform heating of the concrete, which contributes to the absence of internal stresses and other defects in the structure. The results of accelerating curing of the concrete slabs with the use of microwave radiation as a source of heat were obtained, that allows to refuse the use of expensive foreign additives for accelerated hardening of concrete, which lead to degradation of strength characteristics due to the increase of acidity.
The main parameters of beam-type microwave installation with frequency of the electromagnetic field oscillations 2450 MHz, the microwave output power of 4,8 kW for the heat treatment of a carbon fiber parabolic antenna, with heat-resistant epoxy binder, of the aperture diameter 1200 mm, thickness 5 mm are presented. The main results of the temperature distribution calculation over the antenna material from a polymer composite material are presented. Duration of antenna heating from temperature +20°C to temperature +180°C, weighing 11,8 kg, was 5,9 minutes. The temperature deviation from the nominal value of the temperature on the surface of the antenna material was absent, and in the thickness of the material of the antenna does not exceed 3°C.
Theoretical and experimental results of curing of polymer composite pipes with the use of microwave radiation energy are presented. The results of studies on the accelerated curing of polymer composite pipes with diameter of 2000 mm, thickness of 36 mm at a temperature of +200°C and at anelectromagnetic field frequency oscillation of 2450 MHz and the output microwave power of 115 kW in a beam-type microwave device are given. The temperature deviation from the nominal value on the outer surface of the pipe is absent, and in the thickness of pipe does not exceed 5°C. A method of composite pipes curing can reduce energy costs, increase productivity and improve working conditions of staff.
The reports of the scientific and technical conference reflected the results of theoretical and experimental research in the field of electrodynamics and microwave technology, microwave electronics, nanoelectronics, power electronics, semiconductor electronics, electric power engineering, systems of measuring and medical technology.The results of the study of resonator and slowing down systems, microwave devices, devices for vacuum, plasma and microelectronics, technological issues of manufacturing electronic products are presented.The collection includes three sections: microwave electronics, vacuum microelectronics and nanoelectronics; electrodynamics and microwave technology; technologies for the production of electronic devices, power electronics, applied aspects of electronic instrumentation.For specialists in the field of electronic engineering, electrodynamics and microwave engineering, microwave energy, control and measuring and medical technology, as well as teachers, students, undergraduates and postgraduates of radiophysical, electronic and energy specialties.
The results of the microwave radiation influence of the electromagnetic field oscillation frequency of 2450 MHz on the process of curing thermosetting epoxy resins, which are used as a binder in the production of polymer composite materials based on basalt, glass and carbon fibers, are presented. It is shown that the density of the cured thermosetting epoxy resin using microwave radiation becomes higher compared to traditional methods. The maximum density of thermosetting epoxy resins is achieved by uniform microwave heating.
The results of microwave influence aimed at the temperature rise in local area in multilayered biological tissues are given. the experimental results of temperature distribution in multilayered biological tissue are presented at the electromagnetic field frequency of 2450MHz. The model and analytic calculations for the temperature distribution inside the biological tissue are presented. The calculation results for the temperature distribution in multilayered biological tissues are given.
Generalized error-locating codes are discussed. An algorithm for calculation of the upper bound of the probability of erroneous decoding for known code parameters and the input error probability is given. Based on this algorithm, an algorithm for selection of the code parameters for a specified design and input and output error probabilities is constructed. The lower bound of the probability of erroneous decoding is given. Examples of the dependence of the probability of erroneous decoding on the input error probability are given and the behavior of the obtained curves is explained.
The dynamics of a two-component Davydov-Scott (DS) soliton with a small mismatch of the initial location or velocity of the high-frequency (HF) component was investigated within the framework of the Zakharov-type system of two coupled equations for the HF and low-frequency (LF) fields. In this system, the HF field is described by the linear Schrödinger equation with the potential generated by the LF component varying in time and space. The LF component in this system is described by the Korteweg-de Vries equation with a term of quadratic influence of the HF field on the LF field. The frequency of the DS soliton`s component oscillation was found analytically using the balance equation. The perturbed DS soliton was shown to be stable. The analytical results were confirmed by numerical simulations.
Radiation conditions are described for various space regions, radiation-induced effects in spacecraft materials and equipment components are considered and information on theoretical, computational, and experimental methods for studying radiation effects are presented. The peculiarities of radiation effects on nanostructures and some problems related to modeling and radiation testing of such structures are considered.
This volume presents new results in the study and optimization of information transmission models in telecommunication networks using different approaches, mainly based on theiries of queueing systems and queueing networks .
The paper provides a number of proposed draft operational guidelines for technology measurement and includes a number of tentative technology definitions to be used for statistical purposes, principles for identification and classification of potentially growing technology areas, suggestions on the survey strategies and indicators. These are the key components of an internationally harmonized framework for collecting and interpreting technology data that would need to be further developed through a broader consultation process. A summary of definitions of technology already available in OECD manuals and the stocktaking results are provided in the Annex section.