Журнал Сибирского федерального университета. Серия: Техника и технологии @technologies-sfu
Статьи журнала - Журнал Сибирского федерального университета. Серия: Техника и технологии
Все статьи: 1447
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.
Бесплатно
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.
Бесплатно
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.
Бесплатно
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.
Бесплатно
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.
Бесплатно
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.
Бесплатно
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.
Бесплатно
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.
Бесплатно
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.
Бесплатно
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.
Бесплатно
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.
Бесплатно
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.
Бесплатно
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.
Бесплатно
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.
Бесплатно
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.
Бесплатно
The influence of thallium additives on the kinetics of oxidation of the Zn22Al alloy
Статья научная
The article presents the results of a thermogravimetrical study of the effect of thallium alloying additives on the oxidation kinetics of the Zn22Al alloy. Established in the temperature range of 473-623 K the kinetic and energy parameters of the oxidation of alloys. The oxidation of alloys proceeds according to the hyperbolic mechanism and has the order of 10-4 kg∙m-2∙sec-1. Higher activation energies indicate that the oxidation of these alloy samples results in the formation of oxide films with good protective properties. Additives of thallium in amounts of 0.01-1.0 wt.% contribute to a decrease in the oxidizability of the Zn22Al alloy. The resulting products during the oxidation of the studied alloys consist of a mixture of oxides ZnO, ZnAl2O4, Al2O3, Tl2O3.
Бесплатно
Статья научная
The automated laboratory equipment for efficient interrupting electrocontact materials testing with respect to their general functional properties during their development and/or improvement is presented. The equipment for estimating erosion resistance, transient resistance of loaded pair contacts and also welding resistance during on-off cycles by break force measurement (380/220 V, current is 15-30 А, power factor φ=0.8, frequency of on-off cycles is 0.01-10 Hz, controlled duty cycle). The equipment control, monitoring, recording and primary processing of parameters taken from the detecting device are performed using specialized software. The equipment was tested on two type contact materials, Ag and Ag/(15%CdO). The results and appropriate correlation are presented in this article.
Бесплатно
Статья научная
The polyzonal mathematical model of heat transfer in the furnace with a liquid bath of Vanyukov smelting energotechnological complex has been improved and its design-theoretical analysis has been made. The paper gives quantitative estimation of influence on thermal condition of furnaces design characteristics: shapes and size of over layer space, the situation of uptake and place of charge load.
Бесплатно
Статья научная
The task of developing a method and information presentation algorithm for the exchange of complex hierarchical management system in terms of information overload. The criteria of inclusion of information aggregation algorithm. Finding of fact overload the system asked to carry out by comparing the distances between aircraft objects with preset thresholds, the amount of air objects in the processing system of the automated control system components and for each region of space, covert interference - the operator of the complex automation.
Бесплатно
Статья научная
The paper proposed an effective model of management of fuel and energy enterprises, developed on the basis of fuzzy logic, allowing to minimize the risks associated with incorrect forecasting of energy consumption, allowing to consider not only quantitative but also qualitative indicators of the enterprise.
Бесплатно
