05.00.00 Technical science
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Description
The article presents two express-methods of multidetails women’s dresses design, which allow to determine the optimal size and form of the cut out details depending on the way of clothes form shaping. Methods are developed based on the Paco Rabanne’s fashions analysis
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AN ELECTRIC MODEL OF A CITY TRANSPORT NETWORK
DescriptionThe main characteristics of a transport network are the intensity of the traffic flow, speed and density of its traffic. Comfortable driver's traffic density is determined by the rule of the traffic police, which is "clearance between cars on the road should be a tenth of the speed of movement." We have built a reference curve of the density function of the flow of vehicles on its speed, which is basic when simulating a traffic flow. The article describes a model of electrical city transport networks, allowing calculating traffic flows, their speed, the density and the number of traffic lanes by means of laws of electrical engineering. We have also compared electrical concepts (current, resistance, electro-motive force, etc.) and transportation (of intensity-flow lane road, transport driving force, etc.). For the transport network there are methods of calculation of electrical circuits - a method of Kirchhoff's laws, loop currents, etc. We have confirmed the correctness of electric models and the possibility of its use for the calculation of transport networks; as well as we have presented an example of the calculation
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ELECTRO SOLAR WATER HEATING FOR AGRICULTURAL CONSUMERS
DescriptionIn the article, we have described an electro solar water heating system for agricultural consumers. The results of computer modeling in the “Modeling in technical devices” software package have been given
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Description
The article deals with the study of vehicles impact on the environment, since one of the main causes of air pollution are cars with internal combustion engines. One of the most important measures in the fight for clean air is the creation of an environmentally friendly transport. From this point of view, the most promising is the electric car, as the only solution to the problem of atmospheric pollution. In this article, the history of the development of modern electric vehicles, the advantages and disadvantages of their design, as well as the possibility of introducing electric vehicles into everyday life are considered. After the analysis, it was concluded that, in spite of the obvious advantages and the huge path that electro mobiles went through in their development, humanity is still not ready to refuse from cars with internal combustion engines, opting for electric vehicles
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ELECTROCHEMICAL THERMODYNAMICS OF CELLS IN THE CONDITIONS OF ELECTROMAGNETIC ENVIRONMENT
DescriptionThe article covers the basics of thermodynamics and the possibility of the application of its provisions to the basic biological entity - the cell under the influence of external electromagnetic fields. Thus, we consider a system whose properties do not change in time, if it does not occur on the external influences. If the system is subjected to such (mechanical, thermal, electrical, magnetic and other effects), then all its properties, or some of them are changing. If at least one property of the system changes, we will talk about changing the status of the system due to the fact that there was some process. From the point of view of external electromagnetic fields on the thermodynamic system - a cell of a living organism or plant is very important essence of the concept of work. Unlike conventional concepts of the work of expansion (pdV), which is not considered to be useful, we have introduced the concept of "useful" work dA /, which means the operation of the electric current, magnetic field or other physical fields in the design of various electrical devices and appliances used in livestock and crop. The impact of electromagnetic fields on biological objects also leads to a slight increase in temperature of the biological system and, as a consequence, it increases the rate of chemical and biochemical reactions and phase transitions, which is reflected in the increased activity of the biochemical processes in these objects. This, to some extent can explain numerous experimental results of scholars and practitioners concerned with stimulating crops, for example, during preplant treatments
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ELEMENTS OF CONTROL OVER HIERARCHIE SYSTEMS WITH ASSUMED HIERARCHY
DescriptionThe article presents a mathematical model of control over dynamic hierarchy system. The model was proposed for dealing with systems with assumed order in the technical problem of predicting destructions depending onto the amount of defects on different scale levels. The problem of the closest to a certain point of shelf life of hierarchy system is solved. The example of approach control during the given time is given. The problem concerns mathematic programming. Formulation of multi-parameter vector optimization criteria (improvement) with its own hierarchy and the formal exercise of multi-criteria optimization of the model parameters. The research can achieve clarity about the conditions under which the structure is preserved. Managing sustainable development system with a given level of the hierarchy for the technical systems can only be achieved in keeping
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ENERGY SUPPLY SYSTEM OF THE TERRITORIAL AGRICULTURAL AND SILVICULTURAL BIO-ENERGY SECTOR
DescriptionThe article describes the characteristics of the organization of energy supply of the territorial agricultural and silvicultural bioenergy sector. It also presents the technical solutions of energy systems that improve fuel efficiency and intended for the utilization of biomass
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ENERGY PERFORMANCE OF MACHINES FOR SOIL CULTIVATION
DescriptionCurrently a significant proportion of the cost of agricultural production is energy costs. Therefore, considerable attention is paid to energy and resource saving equipment and technology. In this regard, the role and importance of the energy assessment of machines, allowing determining not only the power characteristics of the power, but fuel consumption per unit of cultivated area or per unit of output. Conducting energy assessment of machines and equipment reduces the economic and labor costs, at the expense of more detailed and optimal selection of machines and units for performing certain manufacturing operations in agricultural production. In the article we describe energy evaluation of different tillage agricultural machinery aimed at determining energy consumption when executing the set of technological operations machines and equipment on the operation modes set by the standards under which stable the operations are performed. The use of the results of energy assessments on traction characteristics of agricultural machines and tractors will allow getting the maximum effect when performing technological operations. In turn, the lack of monitoring of key energy performance of cars during their operation leads to a partial use, which increases costs
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ENERGY-LOADING OF DISKS IN FRICTION PAIRS OF “DISC-PAD” OF BRAKING DEVICES IN VEHICLES (part two)
DescriptionIn the materials of the article we mention the regularities of changes in the volume and surface solid temperature gradients and self-ventilated brake discs and illustrate their impact on the main operating parameters of the friction pairs of disk-to-pad brakes of the A 172 bus; the relationship between thermo-physical parameters of polished and matte surfaces with areas of brake discs of various types. The influence of the type of tests on the pairs of loaded with energy friction disk and pad brakes of the vehicle. We have set the intensity of heat exchange processes from the surfaces of the brake discs of various types. It is shown that this leads to increased surface temperature gradient. The volume and the surface temperature gradients of the brake discs were determined with the involvement of the hypothesis of summation of temperatures on the surface when you post the generated electric currents. It was found that in the surface layer of the working surface of a solid brake disc at its pulse heating under the influence of the temperature of the flash nucleate cracks due to the thermal fatigue of the material of the disk. The features of the design of the brake discs were considered as well. On the basis of the calculation and the experimental data we have shown a correlation between the emissivity of brushed and polished surfaces and their areas in the disk-to-pad brakes when using solid and self-ventilated discs
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ENERGY-LOADING OF DISKS IN “DISC-PAD” FRICTION PAIRS OF BRAKING DEVICES IN VEHICLES (part one)
DescriptionWe’ve illustrated assessment of energy-loading of disk-pad brakes of the bus A172 in the preliminary stages of tests type I and II according to regulated standards of UNECE and we’ve established regularities of heat exchange processes in the interaction surfaces of solid and self-ventilated brake discs with high-speed currents of washing air