Журнал Сибирского федерального университета. Серия: Техника и технологии @technologies-sfu
Статьи журнала - Журнал Сибирского федерального университета. Серия: Техника и технологии
Все статьи: 1459
Статья научная
For crystals grown from a liquid melt using the Czochralski method, under the control of the current area of the crystal on the basis of the contact measurement method, defines the requirements for ensuring the accuracy of measuring the value of 1 %.
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The algorithm for compensating distortion of images of type “blur”
Статья научная
The paper considers the model of linear blurring with a uniform rectilinear motion of an object when its speed is constant, and its direction is parallel to the lines of the formed image. An algorithm for linear blurring compensation based on the account of the physical processes of its formation when obtaining the images is proposed. A system of equations for the restoration of the original video signal samples undistorted image of the object is obtained. Processed the frame of a real video sequence with a horizontal blur and presented its results. Considered the comparison of the results of the restoration of distorted images by the proposed algorithm with known methods.
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The alumina dissolution in industrial aluminum cells
Статья научная
The dissolution behaviors of primary and secondary alumina in aluminum bath were compared. The dissolution of primary alumina can be divided into a few key steps: fast dissolution upon feeding, crust formation and sludge dissolution. The dissolution rate of secondary alumina is much faster than that of primary alumina. Industrial measurements of alumina concentration in 410 kA and 500 kA cells confirmed the laboratory results.
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The analysis of modern information and fire conflict distinctive features
Статья научная
The article dwells upon the role of information superiority in achieving the geopolitical goals. The stages of states and their allies’ opposition are considered. The importance of overtaking the opposing force in reconnaissance is explained. The military-system analysis of initial conflict opposition characterizing the high degree of tension and further development of this opposition, main tendencies of intelligence gathering systems are stated.
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Статья научная
In article considered questions of the choice of maximum filling billets during cold rolling of aluminum alloy tubes according to a given degree of deformation for the different methods for calculating the profile of a stream caliber.
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Статья научная
Operation is devoted a problem of identification of dynamic system of the volume hydraulic actuator of the running gear of a vibrating roller. The mathematical model of control process by speed of driving of a vibrating roller taking into account dynamics of hydrostatic transmission and a moment of resistance to roller driving is observed. Assay values of dynamic responses, a frequency analysis of a model of a guidance system are resulted by speed of driving of a vibrating roller.
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Статья научная
The laser analyzers MAYA are successfully applied in industry in order to solve the tasks of crushed ore sorting and stabilization of the composition if raw material mixtures in metallurgy and in production of fireproof materials. The tests of non-ferrous ores such as Cu, Mo, Zn, Pb, Sn, Ti, Be, Sr and Ba confirm that the laser analyzers could be applied in this branch at different stages of the technological process: extraction of raw material, preparation of raw material mixture, check of technical composition, operative check of the finished products’ quality.
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Статья научная
The features of boundary element methods (method of moments), finite element methods, finite difference methods in the time domain, and finite integral methods for volumetric space modeling are examined. The classification of finite element method variants is presented. The advantages of finite difference methods in the time domain are described and structurally presented. The MoM, FEM, FDTD, and FIT methods are generalized for modeling the electromagnetic environment inside and outside of buildings, taking into account the complex influence of electromagnetic fields and radiation in a wide frequency range, as well as the possibility of accelerating the processes of forming distribution patterns of electromagnetic field components and patterns of electromagnetic hazard.
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Статья научная
In bulk and thin film state Fe86Mn13C alloy observed experimentally self-assembly of the crystal and magnetic structures on multiscale levels. Offered self-assembly cluster model of atomic structure based on the concept of a liquid-like state of the material in localized areas, formed in the waves of plastic deformation.
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Статья научная
A brief description of deterministic and probabilistic-statistical methods for calculation of electricity losses in the distribution networks of 6-35 kW. The optimal combination of weight deterministic and probabilistic and statistical approaches in the combined calculation of power losses by criterion of a minimum of errors.
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Статья научная
This article reveals the features of the channels of hyperspectral aerospace images. There has been suggested the algorithm with interchannel finding of the best channel of intrabands correlation and the use of indexed lossless encoding, which allows to reduce the dimensions of the image channels and to convert them before compression. Also the article shows the results of experiments in comparison with universal archivers such as Winrar, 7Z, and JPEG Lossless according to the compression degree and several parameters: the interchannel correlation, geometric image size, number of channels, number of channel groups. Furthermore, the author of the article studies the options of compression with the search of the main channel of the correlation and without it; these options demonstrate the increase in compression degree due to diff erential transformations, which allow to store the information in a more compressed form.
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Статья научная
The influence of furnace operating conditions on the heat transfer in Vanyukovs smelting energotechnological complex has been researched on the basis of its polyzonal mathematical model. The quantitative relations have been found allowing to run the melt more effectively to maintain melting temperature required by the technology when composition of matte being constant. The recommendations for efficient operation mode of lining cooling under layer space of the furnace were given.
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The conjugate equations in the heterogeneous systems heat and mass exchange tasks
Статья научная
Conjugate equations based on a conception of the uniform mathematic description of a naturally equal heating transfer process in all points of a heterogeneous system is proposed. The equations may be applied to describe the heat and mass exchange processes in the divided boundaries of the heterogeneous systems instead of conventional IV type boundaries conditions. The modeling results of the underground coal gasification heat and mass exchange is adduced in the new problem definition.
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The evolution of smart wrist band by using sensors
Статья научная
In recent years, the integration of various electronic components and sensors with textiles aimed at giving additional functions has become more common. In this respect the wrist band can be made functional while retaining the aesthetic appeal and style at lower cost which is in high demand. Smart textiles are fabrics that have been designed and manufactured to include technologies that provide the wearer with increased functionality. Smart textiles can be produced by knitting, weaving and embroidering with conductive threads, conductive metal coating and screen printing that can be used to develop wearable electronic textiles but amongst these, the use of conductive inks onto textiles has gained interest due to the ease of their use and manufacturing scalability. The emergence of wireless technologies and advancement in on-body sensor design can enable change in the conventional healthcare system, replacing it with wearable ones, centered on the individual. Wearable monitoring systems can provide continuous physiological data, as well as better information regarding the general health of individuals. Thus, such vital-sign monitoring systems will reduce healthcare costs by disease prevention and enhance the quality of life. This dissertation is aimed at developing smart band by incorporating vital-sign monitoring systems. Using this assembly, the recent progress in non-invasive monitoring technologies for chronic disease management is reviewed. Devices and techniques for monitoring pulse rate and body temperatures are discussed in particular. For our research conductive ink and conductive fabrics are presented additionally. The main aim of this project is to produce a wearable wrist band which detects vital body parameters like pulse rate and temperature using sensors, conductive ink and conductive fabric. Finally, the recorded temperature and pulse rate readings are sent to mobile app via Wi-Fi.
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Статья научная
In this article the problem of increase in operability of a hydraulic actuator by use of a multiple-pass heater as means of cooling of working liquid is considered. For studying of thermal processes, check of mathematical model and an assessment of efficiency of application of a multiple-pass heater the developed experimental stand is given.
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The formation of regional spatial data infrastructure
Статья научная
In this paper the major characteristics of spatial data, its infrastructure and main components are discussed. Herein, spatial metadata and software and technical support for geoportals, as well as their services are examined. In this work technologies of development of applied geoinformational web-systems (geoportals) are discussed. Within the paper the software architecture and web services of the geoportal of Institute of Computational Modeling of Siberian Branch of Russian Academy of Sciences is presented.
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Статья научная
The theoretical basics of copper-bearing sulphide concentrate one-stage recycling technology in oxygen fuel-fired furnaces for blister copper (white matte) melting are stated. The pre-design furnace heat transfer characteristics investigation based on polyzonal mathematical model has been led. It has been found that the designed scheme of the unit with vertical charge-oxygen fires provides adequate durability and efficiency.
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Статья научная
The article describes the process of induction heating and the advantages of an induction furnace. The models of heating of the graphite crucibles and metal at different frequencies are shown. The technology of chromium bronze smelting in order to obtain cast electrodes for resistance welding is introduced in the current paper.
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The impact of recycling on the mechanical properties of 6XXX series aluminum alloys
Статья научная
Increasing the recycle content of a production stream is one of the easiest methods to reduce the cost of wrought aluminum products. This has economic and environmental benefits, but closed loop recycling systems do not reflect the conservation of the original composition, due to so called “tramp elements”. To understand the influence of certain tramp elements, a campaign of 950 AA6008 ingots were cast reflecting the entire scope of the composition window for this alloy, and the mechanical properties subsequently analyzed.
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Статья научная
This article is about calculations of U-shaped regions of water heat network. The universal calculation algorithm is used for various geometric schemes and simple self-compensating pipeline sections. The influence of slenderness ratio and stress concentration factor in the smooth curved bends on voltages and maximum permissible flight compensated shoulders of U-shaped regions for different geometric confi gurations was taken into account in this work.
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