The article is devoted to solving management problems in the development of an automated workstation (AWS) of an operator-technologist for managing an elevator with a productivity of 280 tons per ...hour. In existing control systems, only grain transportation is provided (there are no systems with automatic drying of grain with high accuracy of humidity measurement), automatic formation of grain movement routes is not provided (for each route, it is necessary to draw up technical specifications and make changes to the control program of the system), and more precise control of grain flows (used automatic valves have only open / closed positions). A brief description of the proposed gate valve control algorithms, automatic construction of the grain drying route, filtering grain moisture readings and fragments of the operator's workstation program (in the indusoft web studio environment) for managing the elevator complex is provided. The proposed solutions allow you to: reduce the emergency downtime of equipment by 20% and the total service time of the complex; weed out unfinished grain for baking in automatic mode for repeated drying; improve product quality due to automatic control of grain overheating; reduce product rejects by 3%, and also reduce the influence of the human factor on the process of transporting and drying grain.
Abstract
Cooling of high-temperature bodies in liquids largely depends on its subcooling to the saturation temperature. An increase in subcooling leads to an increase in the surface temperature, at ...which the vapor film loses its stability and an intensive cooling regime begins. This temperature depends on a number of parameters, such as the properties of a liquid and a solid, the composition and topology of the surface, the value of subcooling. Within the framework of this work, it was possible to achieve a significant decrease in the temperature of the onset of an intensive cooling mode in subcooled water and ethanol by using as working sections of metal samples with a high of thermal effusivity, low roughness and a protective coating from oxidation. The obtained experimental results confirm the approximate model of the appearance of an intense cooling regime
We construct a numerical method for recovering a variable coefficient in the Cauchy problem and also in the initial boundary value problem for the one-dimensional heat equation. The desired ...coefficient is assumed to be time-dependent but not space-dependent. Our approach is based on the construction of an auxiliary ordinary differential equation for the unknown coefficient and its subsequent solution by some numerical method for ordinary differential equations. The apparatus of Lyapunov stability theory is used as well. The main advantages of the method are its simplicity and stability under the initial data perturbations. For the implementation, the method requires some additional information on the solution of the original heat equation at most finitely many points. The efficiency of the approach is illustrated by a few model examples.
In this paper, optimal methods of approximation of some geophysical fields, in particular gravitational and thermal fields, are considered. A review of the results on this problem is presented. An ...algorithm of approximation for the multidimensional thermal fields described by a heat equation with constant coefficients is developed. For this, classes of functions including the solutions of heat equations are introduced, and continuous splines uniformly approximating the functions from the classes in the whole domain of definition are constructed. Upper bounds for the Kolmogorov widths of these classes of functions are given. For a wider class of the thus introduced classes of functions, a lower estimate of the Kolmogorov width is presented.
We present new experimental data on the cooling of nickel and duralumin spheres in subcooled water and ethanol, along with a review of our comprehensive experimental investigations from 2015 to 2022. ...The hypothesis on the vapor film destabilization mechanism during unsteady cooling of high-temperature bodies is elucidated. Additionally, new correlations are proposed for estimating the temperature head at the cessation of film boiling in both saturated and subcooled liquids. The derived equations are validated against an extensive body of proprietary experimental data as well as data from other researchers, exhibiting strong qualitative and quantitative agreement with experimental outcomes.
The first U–Pb (LA–ICP–MS) isotope dating of detrital zircons from quartzites of two strata of the Maksyutov metamorphic complex (Southern Urals) was performed. Zircon grains from the Galeevo ...quartzites are well rounded. The concordant zircon ages fall into the ranges of 529–594, 956–2144, and 2709–2781 Ma; the main age peaks are 544, 551, and 1491 Ma. Zircon grains from the Yumaguzino quartzites are idiomorphic and weakly rounded. The concordant zircon ages fall into the ranges of 497–640 and 957–1027 Ma, forming distinct age peaks of 514, 548, and 605 Ma. The U–Pb ages obtained and their comparison with similar data on the other sequences of the Southern Urals and the Caspian Sea Region indicate the Ordovician age of the protolith of the studied quartzites of the Maksyutov complex.
This paper presents the results of experimental studies of cooling a zirconium ball in subcooled ethanol under the action of a submerged jet. The degree of subcooling of the cooled liquid and the ...distance from the nozzle exit to the cooled surface varies during the experiments. The heat patterns of cooling are presented and the effect of the distance between the nozzle and the surface on the duration of cooling and the transition temperature from stable film boiling to intense heat transfer is revealed.
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A high-resolution scintillating fiber hodoscope comprising multi-anode photomultiplier tubes is presented. The technologies for manufacturing fiber bundles and mounting them into the detector ...housing are described in detail. The functional diagram of the anode-signal discriminator and the characteristics of the hodoscope operating as the part of an experimental setup at the beamline 14 of the U-70 accelerator complex are presented.
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