ISSN / EISSN : 2313-6286 / 2313-8416
Published by: OU Scientific Route (10.21303)
Total articles ≅ 1,867
Latest articles in this journal
ScienceRise pp 3-10; https://doi.org/10.21303/2313-8416.2021.002019
The object of research: the shift of resonant frequency of the piezoceramic electroacoustic transducer Langevin type depending on the shape of the back plate. Investigated problem: the relationship between changes in shape of back plate of the Langevin type transducer with the resonant frequency of the oscillating system. Search quantitative contribution to shift the resonant frequency of each of the modifications: shape, diameter, thickness, weight of back plate. The main scientific results: vibration modes of a transducer with a back plate with horizontal and vertical radiator ribs were obtained. The graphs of the shift resonant frequency depending on the change in the diameter and thickness of the back tail with vertical radiator ribs are presented. It is established, that the change in the thickness and diameter of the back plate of the transducer effects on resonance frequency much less than the change in mass. The area of practical use of the research results: designing piezoceramic electroacoustic transducer with passive cooling method. Innovative technological product: guidelines for choosing the shape changes back plates of the Langevin type transducer for decreasing heating temperature, with keeping resonant frequency. Scope of the innovative technological product: scope of application of the Langevin type transducer: underwater acoustics, ultrasonic technological equipment, ultrasonic engine, piezotransformer, medical equipment, rock drilling devices.
ScienceRise pp 80-84; https://doi.org/10.21303/2313-8416.2021.002009
Object of research: technological culture as a matrix of interaction of the components of the system "man – society – nature/Earth". Investigated problem: the substantiation of the meaning of the Ethics of the Earth in the context of technological culture, transforms the moral and value system of the late Modern era and provokes the emergence of the era of Posthumanism. The main scientific results: the definition of the technological culture of the late Modern era made it possible to determine the existing contradictions in the moral dimension of the existence of man and the Earth. It should be noted that in the context of the technological transformation of the Earth, the existing ethics as a monoparadigm of the Enlightenment does not correspond to the challenges of the beginning of the XXI century. It is emphasized that the ethical dimension of the introduction of technologies into the existence of the Earth is an indispensable component of modern scientific discourse. It is not only about the ethical dimension of technology, but also the importance of the formation of the Ethics of the Earth. This allows to conclude that a person determines its moral position relative to the Earth in the context of the technological transformation of the Earth's existence. The scope of practical use of the research results: the research results can be used in teaching such normative courses as "Philosophy", "Philosophical Anthropology", "Culturology" for students and undergraduates, graduate students of humanitarian and technical faculties. Innovative technological product: Ethics of the Earth destroys the concept of the Earth as an object that is external to humans. The anthropological dimension of the Earth testifies to the fact that a person should be clearly aware of the responsibility for its activities, since the existence of the Earth is a condition for the existence of a person. The scope of using the innovative technological product: the substantiation of the Earth Ethics corresponds to the polyparadigmatic optics of the modern post-non-classical scientific discourse, where a person is one of the constituent parts of the nature / Earth system. The post-non-classical paradigm eliminates the New European anthropocentrism, striking the consequences of which the person of the late Modern era feels. We are talking about environmental and anthropological crises that occur in the space of the Earth in the coordinates of technological culture.
ScienceRise pp 58-67; https://doi.org/10.21303/2313-8416.2021.002040
The object of research is the policy of public debt management of the United States of America and Ukraine. The problem solved is the low level of efficiency of the policy of public external and internal debt management of Ukraine in the context of financing economic growth. The main scientific results: based on the analysis of the policy of public debt management of the United States of America, it has been proved, that the public debt and the US budget deficit should be perceived not as a problem or threat to macroeconomic stability, but as a tool to stimulate economic growth. It is substantiated, that in order to optimize the policy of internal and external public debt management of Ukraine it is expedient to introduce a debt rule, which is based on the program-targeted method of attracting public debt and provides for the use of public borrowing exclusively to finance economic development programs. In this case, Ukraine, following the example of the United States, will be able to achieve sustainable economic growth, because changing the priorities from debt financing of current state budget expenditures to financing capital expenditures will allow the Ukrainian government to develop economic infrastructure, create conditions for high value-added goods and to develop small and medium business, which will ultimately ensure macroeconomic stability and progressive economic development of the state. The scope of practical use of research results. The results of the study can be used by the Cabinet of Ministers of Ukraine, and in particular by the Ministry of Finance during the formation of the Medium-Term public debt management strategy of Ukraine. Innovative technological product: The debt rule is based on the program-target method of attraction and use of the state internal and external debt that allows to use effectively the state borrowings for financing of economic growth. Scope of application of an innovative technological product: Policy of management of the state internal and external debt of Ukraine
ScienceRise pp 11-16; https://doi.org/10.21303/2313-8416.2021.002041
Object of research. The article investigates the cutting forces when grinding martensitic-aging steels with highly porous grinding wheels. The problem to be solved is the regularities of the change in the magnitude of the cutting forces when grinding maraging steels with highly porous CBN wheels. Main scientific results. The studies were performed on martensiticaging steel H8K18M14. As a result of the experiments, it was found that when grinding wheels made of materials such as electrocorundum, CBN (borazon) and diamond, a significant role is played by the values of the cutting force, which increase during processing. During the experiment it was found out: the cutting forces Py and Pz in the width of the allowable modes, which are most often used in circular and flat grinding, can reach the following values: with the structure of the wheel 26 come to values from 2.714N to 30.721 and with the structure of the wheel 40 come to values from 2.49N to 28.185N. Reducing the grain size of the wheel, let’s obtain the effect of increasing the energy costs of the grinding process, by increasing the magnitude of the cutting forces. If to compare the cutting forces that occur when grinding different wheels, it is possible to note the following: in comparison with electrocorundum wheels when using wheels with KNB cutting forces are reduced by 20-25 %, and when grinding with diamond wheels, the effect of cutting forces is reduced by 25 - 30 %. When grinding with highly porous wheels, the cutting force is 15-20 % higher than when grinding with wheels of normal porosity. The area of practical use of research results-grinding technology for maraging steels. Innovative technological product – relationship between processing modes and the magnitude of cutting forces when grinding maraging steels. Scope of application of an innovative technological product-mechanical engineering technology
ScienceRise pp 32-38; https://doi.org/10.21303/2313-8416.2021.002021
The object of research: the process of membrane concentration of buttermilk using methods of removing the polarizing layer on the membrane surface. Investigated problem: determination of the effectiveness of methods for eliminating the polarization layer on the membrane surface during membrane concentration of buttermilk. Main scientific results: The results of experimental studies on methods of removing the polarization layer to increase the productivity of ultrafiltration equipment in the process of membrane concentration of buttermilk are presented. Mathematical models are proposed based on the regression equation of a factorial experiment using the elimination of the polarization layer on the membrane to determine the rational operating parameters of the membrane concentration of buttermilk. These parameters were determined: pressure – 0.4 … 0.5 MPa, buttermilk temperature – 40 … 50 °С, speed of pulsating flows – 1.5 … 1.7 m/s, frequency of bubbling of raw materials – 0 , 10 … 0.15 min-1, bubbling pressure – 0.56 … 0.58 MPa. A comparative analysis of the application of the method of vibrational mixing and bubbling of separated non-fat dairy raw materials to eliminate the formation of a polarization layer on the surface of membranes in the process of membrane concentration is presented. Based on the obtained quantitative and qualitative characteristics of the ultrafiltration products, it can be seen that vibrational mixing and bubbling of the processed buttermilk equally intensify the process of membrane concentration of buttermilk. The area of practical use of the research results: enterprises of the dairy industry of the food industry, engaged in waste-free processing of dairy raw materials and its by-products. An innovative technological product: devices for reducing the polarization layer, allowing to increase the performance of membranes in the process of membrane concentration of buttermilk. Scope of application of the innovative technological product: waste-free processing of dairy raw materials at dairies and dairy plants and other food industry enterprises.
ScienceRise pp 68-79; https://doi.org/10.21303/2313-8416.2021.002036
The objects of this research are: first, to highlight some of the socio-economic impact, arising out of the government's strict lockdown rules due to the Covid-19 pandemic. Second, to explore the psychological effects of the new normal on citizens, arising out of the lockdown. The author investigated the following problems: social problems, caused by restricted movements, increase interpersonal violence crimes, and economic problems due to job losses, emanating from several businesses closures. The main results of the research are: very high number of death rates with over (78 000), succumbing to coronavirus in South Africa, high unemployment, threats of food scarcity, educational setbacks due to schools closure, economic inequality gap, more widely pronounced, and hospitals, put under severe pressure due high patients needs. The area of practical use of the research is for all citizens, directly affected by the global pandemic. The research highlights the significance of the use of technology to inform and support lifelong learning using more e-learning platforms as an alternative for the old pedagogic delivery of lectures. The innovative technological products, arising out of the lockdown, were several e-learning softwares introduced. Apps like ‘uber eats; Vromo; Open Table; and ChatFood were all introduced and made delivery of fast food to our homes relatively easy. Several e-learning products were made popular: Microsoft teams; Zoom; Skype; Canvas; Ariculate 360; 7 taps; Spayee and teachable. The Scope of the innovative technology products were more pronounced in both the hospitality, catering industries, and educational institutions.
ScienceRise pp 48-57; https://doi.org/10.21303/2313-8416.2021.002008
Research object: the adaptation and application of the genetic algorithm for electrodynamic transducer model parameters identification. Investigated problem: to formulate loudspeaker identification task as an optimization problem, adapt it to the genetic algorithm framework and compare obtained results with classical identification method using added mass. Main scientific results: the complete genetic algorithm loudspeaker identification procedure is presented, including: – data acquisition scheme, where the directly measured values for the algorithm application are: voltage at loudspeaker terminals, current through the voice coil and displacement of the moving part – selection of an appropriate set of genes of an individual – derivation of the fitness function for assessing the quality of the identified parameters, which can also be used to identify other types of electroacoustic transducers Also, the advantages of this method in comparison with the classical method of identification using added mass are considered, that are its versatility and ability to quickly configure and adapt for research and experimentation with different loudspeaker models and different types of transducers used in acoustics. Area of practical use of the research results: the proposed genetic loudspeaker model identification scheme can be directly applied on practice to speed up research and development tasks in electroacoustics and other related fields that require frequent experimentation with different types of transducer models. Innovative technological product: genetic algorithm based loudspeaker identification scheme that can be applied to identify various model of electrodynamic transducers. Scope of application of the innovative technological product: electroacoustics, loudspeaker design, audio systems
ScienceRise pp 39-47; https://doi.org/10.21303/2313-8416.2021.002039
Object of research: technology of production of dietetic hardtacks using germs and meal of wheat germ, by defatting them. Investigated problem: the process of defatting wheat germ meal not only reduces the total amount of lipids, but also contributes to a change in the ratio of individual fatty acids. Main scientific results: in order to use wheat germ meal as the main raw material, together with wheat germ in the production of dietetic hardtacks, their amino acid composition, biological value and balance of essential amino acids were studied in comparison with the FAO/WHO standard. The mineral, vitamin and fatty acid composition of the germ and meal of wheat germ has been determined. The results obtained were used in the development of the recipe composition and the technological process for the production of dietetic hardtacks. The results obtained (calculation of the balance according to the "tryptophan" and "threonine" indices) confirm that wheat germ meal is a valuable raw material that can be used in technologies for the production of high-protein food products. The moisture-absorbing capacity of wheat germ and meal was studied in order to determine their ability to form dough. It has been established that the best performance is characterized by a mixture of wheat germ meal and wheat germ in a ratio of 80:20. The ability of digestion by enzymes of the gastrointestinal tract "in vitro" of wheat germ meal proteins has been investigated, which determines the biological value of food products and makes it possible to predict the degree of their utilization by the body. The field of practical use of the research results: production of dietetic hardtacks in restaurant enterprises, in specialized confectionery shops, as well as within the boundaries of food production An innovative technological product: the possibility of using valuable secondary raw materials in food production technology – wheat germ and meal, which is a source of high-quality protein, vitamins and minerals. This will make it possible to adjust the nutritional and biological value of flour confectionery products, as well as improve the nutritional structure of consumers of these products. Scope of application of an innovative technological product: dietetic hardtacks
ScienceRise pp 24-31; https://doi.org/10.21303/2313-8416.2021.002042
The object of research: ultrasonic processing technology of textile materials. Investigated problem: increasing the degree of splitting of complex hemp fibers due to the effect of the mechanism of ultrasonic cavitation on them. The main scientific results: The article shows the potential of textile production to ensure the environmental friendliness of textile products, and the development and implementation of new eco-technologies of physical and mechanical cottonization of hemp fiber is important in this. Analysis of existing methods of cottonization and structural features of hemp fibers has led to the conclusion that the destruction of cellulose satellites in complex fiber can be considered as a process of purification from impurities, since the technologies for purification of substances in the aquatic environment by ultrasound now are widely used. Therefore the process of cottonization of hemp by technology of ultrasonic treatment was used in this investigation for the first time. The basic principle effect on the textile material what placed in the liquid are the hydroacoustic effects formed by the collapse of cavitation bubbles in the contact zone "liquid-material". Experimental studies of the geometric characteristics of the obtained hemp cottonine were carried out, and the effectiveness of the effect of ultrasonic vibrations on the change of the structure of hemp fiber was confirmed. Due to the removal of inlaid substances under the action of cavitation, the complex fibers of hemp were split, as a result of which the range of variation and the absolute value of their length and linear density were decreased. The scope of practical use of the research results: textile enterprises of deep processing of bast raw materials into technical and household yarns. Innovation technological product: technology of ultrasonic cottonization of hemp fibers. The scope of using the innovation technological product: manufacturing of textile hemp products for general use.
ScienceRise pp 17-23; https://doi.org/10.21303/2313-8416.2021.002033
The object of research. Long-span glulam arches are widely used as coatings for public and sports buildings. The studies carried out concern double-hinged segmental arches with spans of 60 m and more. Description of the problem. The study of the peculiarities of the work of arches as a system "soil base - foundation - above-ground structure" is associated with the significant influence of uneven deformations of supports on the stress-strain state of the above-ground structure. A change in the stress-strain state in the structure itself, associated with uneven deformations of the foundations, can lead to a significant decrease up to the complete exhaustion of the bearing capacity Main scientific results. This article provides an analysis of the change in the stress-strain state of glulam arches when calculating the system "soil base-foundation-above-ground structure". It is noted that non-uniform deformations of supports have the greatest influence on the stress in the support zones of the structure. The range of critical non-uniform subsidence has been determined, which should be limited when calculating and designing the foundations of large-span arches. It has been confirmed that double-hinged glulam arches work well in conditions of uneven subsidence due to the peculiarities of the design scheme. The results of the studies carried out and the recommendations provided will significantly improve the reliability of large-span structures and require mandatory inclusion in the current practice of calculation and design. In addition, additional requirements for the distance between mine workings for large-span structures should be introduced when performing engineering and geological surveys. This distance should be reduced for a clearer account of the deformability of the foundations for columnar foundations, and the number of workings should be increased. The area of practical use of the research results. The cross-section of the glulam arches is selected taking into account additional deformations of the supports, making it possible to avoid unpredictable damage to the structure during operation. Innovative technological product. Glulam arches, the cross-section of which is determined taking into account additional deformations from uneven subsidence of the supports Scope of application. Glulam arches calculated in this way can be used as covering for public and sports buildings for various purposes.