bluuebunny/crossref_metadata_2025 huggingface dataset:
The Calculation of Double Nonlinearity and Material Anisotropy Influence on the Temperature Distribution in the Cylinder Under High Temperature Heat Exchange
Authors: Zaytsev Yevgenij
Published: December 2021

At the present stage of the development of technology, it is necessary to ensure the strength, reliability and durability of the structure that successfully functions under conditions of high-temperature heat exchange as maximum as possible. In this regard, graphite structural elements are widely used, and they are also applied for parts of space and aircraft, jet and rocket engines. The transversely isotropic graphite cylinder used in this work has a unique set of qualities that make it indispensable for problems in nuclear physics and power engineering; however, in the calculation of thermal engineering practice, it has not been studied enough, since it contains a large scatter of thermophysical characteristics for various grades of graphite. The aim of the study, including the basis of the developed method for solving boundary value problems of doubly nonlinear unsteady thermal conductivity, is to consider the effect of temperature dependences of the thermophysical characteristics of the material on temperature, zonal radiative-convective heat transfer and anisotropy on the distribution of temperature fields along the length, at the center and surface of a semi-infinite solid cylinder. The essence of this method is that the Goodman’s and Kirchhoff’s transformations are applied to the problem posed converted to a dimensionless form, then the relative temperature and functions from it, are expanded in the series of sines on the a priori interval, then the superposition principle is applied, after which the original setting is converted to a set of linearized problems with reduced thermophysical characteristics. Linear problems are solved by the method of integral transformations, which are summed up. The upper limit of the priori interval is determined from the condition that the relative temperature obtained from the solution of the problem Fo ® ¥ takes the value of the upper limit of the a priori interval. A large number of numerical calculations in the Matlab environment graphically show changes in the relative temperature on the axis and surface of the cylinder in a wide range of Fourier criteria. It is found that with an increase in the Fourier criterion, the character of heating changes qualitatively from the axis to the surface of the cylinder, both in terms of nonlinearities and anisotropy. For the case of double nonlinearity, the location of the temperature fields at different anisotropies in comparison with an isotropic material is shown graphically.
Steam Generator Strength Computation for Nuclear Electric Power Plants of a Low Power
Authors: Kravchenko Volodymyr , Lymarenko Oleksandr , Xiaolong Zhou , Khromiy Kiril , Buchka Yehor
Published: December 2021

Today, the world oversees an explosive development of the nuclear power stations (NPS) of a low power. Most projects deal with pressurized water reactors and as a matter of fact with steam generators (SG). Ukraine has a well-developed engineering industry backbone that can be used for the production of the equipment required for the nuclear power plants of a low power. This scientific paper delves into the computations of the strength of elements used for the monotube steam generator with cylindrical coils that is the most presentable of all the projects in question in IAEA materials. Appropriate methods were developed to perform structural computations and steam generator strength computations. The mathematical model was developed that allows us to perform strength computations of the SG elements making use of the analytical method with reference to the Regulations and do simulations using the ANSYS software code. The specified elements include the body elements, in particular the cylindrical part, the flange, the bottom and the cover, including the heat carrier branch pipe and heat exchange tubes. The comparison of the data obtained by both methods showed their similarity and accordingly, the accuracy of the data that are indicative of the need for an increase in the wall thickness of the cylindrical part of the external branch pipe intended for the heat carrier. The body bottom strain for calculated dimensions exceeds the permissible value by 1.56 %. Since this value is 5 % lower than permissible values it is deemed that the strength condition is passed through. The simulation proved that the strength conditions are met for heat exchange tubes, for the body, the body cover, the body flange, the conical part of the external branch pipe intended for the heat carrier. Based on the analysis done, we would like to recommend performing strength computations using the normative method with the subsequent check out by the simulation using the computer code.
Assessment of the Technical Condition of the Emergency Heat Exchanger for the Reactor Plant of the B-320 Type in Order to Extend Its Service Life
Authors: Konshin Valeriy , Zaiats Mikola
Published: December 2021

Extending the life of nuclear power plants in Ukraine during in the super-project period, as in most countries operating nuclear power units, is an accepted strategy and is being implemented practically. In this regard, there is a need for verification calculation of the main elements The calculated analysis of the stress-strain state of the heat exchanger is carried out using the finite element method of power equipment that determine the resource characteristics. The technical condition of the emergency cooling heat exchanger  for the power unit no. 3 of the SUNPP has been evaluated. The analysis of design, technical and operational documentation in the amount of preliminary evaluation of technical condition was performed. Potential mechanisms of wear of heat exchanger elements were determined. The technique of carrying out verification calculations for static, cyclic and seismic stability was described. The emergency cooling heat exchanger calculation model is made in the APM Structure 3D calculation code. The tense-deformed state of the heat exchanger is calculated using the finite-element method of resampling the design region.  The results of the verification calculation of the emergency cooling heat exchanger in the calculated states corresponding to normal operating conditions, hydrotests and under seismic impacts in conditions of the maximum design earthquake were presented.  The correspondence of the actual stresses in the calculation zones of the heat exchanger to the permissible values, specified in the current regulatory documentation was established. The amount of damageability to the heat exchanger elements was determined for the permissible number of load cycles. The cyclical strength of the elements of the emergency cooling heat exchanger, taking into account the period of application equal to 60 years inclusive, is ensured in accordance with the requirements.
Selection of the Design of a Contact Condenser of a Gas-Steam Plant with Steam Injection into the Combustion Chamber
Authors: Lytvynenko Oksana , Myhaylova Irina
Published: December 2021

Due to the importance of the problems of implementing energy-saving technologies in modern conditions, one of the promising areas is the use of gas turbines for combined heat and power generation. One of the areas of effective development and technical re-equipment is the widespread use of highly economical combined steam and gas plants and gas turbines. The operation of the gas turbine unit “Aquarius” SE NPCG “Zorya-Mashproekt” with the injection of steam into the combustion chamber, which operates on the advanced cycle A-STIG and has in its circuit equipment for water regeneration, condensed from a vapor-gas mixture is considered. For condensation of steam from the vapor-gas mixture, a contact condenser-gas cooler is used, which is a mixing heat exchanger of complex design. The efficiency of heat transfer is determined by the design of the nozzle, namely, the developed heat transfer surface, small hydraulic supports, high heat transfer coefficients. An important aspect is the overall dimensions, which must be within certain limits. In the work it is offered to execute a design of the condenser in the form of a packed column. Different types of nozzles are considered to choose the best option. As a result of thermal design calculation of the contact capacitor, it is proposed to use Rashiga rings (15152) as a nozzle, which provide the lowest height of the nozzle at the required diameter of the device.
Experimental Studies of the Heat Exchange Between the Water Film and the Casting Roller in the Thermal Preconditioning Chamber
Authors: Pereselkov Alexander , Kruglyakova Olga
Published: December 2021

When the casting roller is cooled or heated in the preconditioning chamber the water is supplied to its surface by flat-jet nozzles. The visual inspection of the model of the casting roller showed that a considerable part of it can be covered with the water film spreading from sprinkling zones. It was established that the heat conductivity in the roller body is considered to be a crucial thermal preparation factor in the conjugate heat-exchange problem for the roller of a large diameter at Bio criterion values exceeding 20. Hence, it is sufficient to provide an essential level of the heat transfer that corresponds to the heat transfer coefficient of 2000 W/(m2∙K) to provide appropriate operating conditions for the thermal preparation of the roller. The conditions are also met in sprinkling zones. Due to this fact this scientific paper studies the heat exchange conditions under the water film that spreads between the adjacent sprinkling zones. A range of changes in the flow rate of the spreading water film was determined experimentally. The conditions of heat exchange between the surface of alpha-calorimeter and the water film were analyzed depending on its flow rate and the heat meter surface temperature. A generalized correlation equation was derived. It was established that the heat exchange intensity in sprinkling zones and under the spreading water film meets technological roller treatment conditions in the preconditioning chambers. The obtained research data can be used for the rational arrangement of the collectors and flat-jet nozzles in casting roller preconditioning chambers to reduce the cold and hot water consumption and cut down operating costs.
MAIN WORKS OF PROFESSOR YA. M. MAYER (A REVIEW)
Authors: Nazarenko Sergej , Tkachuk Mykola А. , Marusenko Svitlana
Published: December 2021

The article is devoted to an overview of the scientific and pedagogical activities of a prominent scientist in the field of engine building and mechanical engineering, one of the organizers of the higher school of Ukraine, a public figure, Professor Ya. M. Mayer. In the biographical work, the first study of complex life path and versatile creative heritage of the last rector of Kharkiv Technological Institute, the founder and director of the Ukrainian Research Institute of Internal Combustion Engines, director and scientific leader of the Ukrainian Research Aviation Diesel Institute, one of the creators of the famous V-2 diesel engine, one of the heads of the department «Theory of Mechanisms and Machines» Yakov Moiseevich Mayer.
Keywords: engine; engineering science; higher technical education; Ya. M. Mayer; KhPI; scientific school; SE “KhKBD”; diesel
RESEARCH AND EXPERIMENTAL STUDIES OF STRESS-STRAIN STATE OF DISCRETE-CONTINUAL HARDENED MACHINE PARTS
Authors: Veretelnik Oleg , Tkachuk Mykola M. , Kravchenko Serhii , Saverska Mariia , Kutsenko Serhii , Grabovskiy Andrey , Klochkov Illia , Tkachuk Mykola А.
Published: December 2021

Research and experimental studies of stress-strain state of discrete-continual hardened machine parts are presented in this work. This hardening method is distinguished by incorporation of numerous hard spots into the surface layer of one of the bodies. Meanwhile the other part is covered by a continuous corundum layer. Correspondingly, a network of microchannels for lubricant is formed between the bodies. Furthermore the contact loads are intensified in the vicinity of the harder material in the discrete zones. As a result the strength and durability of the loaded parts is increased. The technological parameters of the hardening process have great impact on the resulting characteristics. In particular, this concern the shape of the discrete hardening zones and the material properties of the corundum layer. These factors were varied in stress-strain analyses of the contacting bodies. The dependence of the stress-strain state characteristics on the varied parameters was established. The justified recommendations regarding the technological parameters of the discrete-continual hardening have been developed.
Keywords: stress-strain state,  discrete-continual hardening,  contact interaction, finite element method, contact pressure, machine parts
PROBLEMS OF DRIVE MECHANISMS OF TECHNOLOGICAL SECTION OF FIRING AND GRINDING DURING CEMENT PRODUCTION
Authors: Kychma Andrii , Novitskyi Yurii , Predko Rostyslav
Published: December 2021

The analysis of conditions of long operation of driving mechanisms of technological sites of firing and grinding at cement production is carried out in the work. Typical variants of mutual arrangement of crown pair elements in case of rectilinear axis of rotation of technological unit body and axial beating of gear ring, as well as variant of mutual arrangement of crown gear elements in case of curved axis of rotation of rotary unit body are considered. A technique for determining the total angle of skew of the teeth of the crown pair, taking into account the errors of manufacture and the relative position of the wheels of the open gear. On the basis of experimental data the dependences of the total skew angle of the teeth of the crown pair as a function of the rotation angle of the gear crown are constructed and the possible range of the total skew angle under different operating conditions of the considered large rotating units is determined. To assess the stress-strain state of the elements of the ring gear mounted on the furnace body, a solid model was created in the software environment Solid Works Simulation. As an example, the dependences of the change in the magnitude of the deformation of the teeth of the toothed crown in the plane of action of a uniformly distributed normal force are determined. Practical recommendations for improving the design of the crown gear pair are offered.
Keywords: rotary kilns; mills; crown gear; toothed crown; the angle of skew of the teeth; finite element method
CONSTRUCTION OF MATHEMATICAL MODELS USING THE METHODS OF CORRELATION AND REGRESSION ANALYSIS
Authors: Prishchenko Olga , Cheremskaya Nadezhda , Chernogor Tetyana
Published: December 2021

The article discusses the construction of a mathematical model using the methods of correlation and regression analysis in determining the functional relationship between the quantities. When conducting an experiment, it is often necessary to establish the interdependence between two or more quantities in order to obtain an empirical formula. In some cases, this is a simple task, because these connections are almost obvious or known in advance. As a rule, to establish the relationship between different indicators, factors and characteristics is not a trivial task. There is a need to use some hypothesis in the form of functional dependence. In other words, it is necessary to replace this functional dependence with a fairly simple mathematical expression. Such a mathematical expression can be a linear equation or a polynomial. In order to use such experimental data to determine such a mathematical or functional relationship between variables, the methods of correlation and regression analysis are used. Correlation analysis provides an answer to the statistical hypothesis of the absence or presence of a relationship between variables with some predetermined confidence probability. Determination of the functional dependence between different values on their experimental values is carried out using regression analysis. It is based on the well-known method of least squares. Proposing one or another regression equation, the researcher determines both the very existence of the relationship between variables and its mathematical form. Regression analysis considers the relationship between the dependent quantity and non-dependent variables. This relationship is represented using a mathematical model, that is, an equation that connects the dependent and independent variables. Processing of experimental data using correlation and regression analysis allows us to build a statistical mathematical model in the form of a regression equation. Thus, the methods of correlation and regression analysis are closely related.
RESEARCH OF THE INFLUENCE OF THE COMPONENTS OF CHOCOLATE GLAZES ON THEIR RHEOLOGICAL CHARACTERISTICS
Authors: Bukhkalo Svetlana , Zemelko Mariia
Published: December 2021

Chocolate glaze is a large-tonnage component of various branches of food technology, which also performs important technological tasks, namely: helps to slow down oxidation processes; improving emulsifying and dispersing properties; prevents hardening of certain types of products; prevents the ingress of moisture, which increases the shelf life of the confectionery, etc. At the first stage, the main problems of production of the confectionery industry are determined - they require a scientific justification for the choice of competitive components of production technology, taking into account quality-cost indicators. Next, for the specified parameters of the production technology determine the components of the formulation of chocolate glazes. As an example, the results of studies of selected technological parameters of some compositions of chocolate glazes, a comparative analysis of their effectiveness on the rheological properties of compositions based on cocoa butter: alternative surfactants – standard lecithin – alternative surfactants - monoglycerides and a mixture of mono-, di- and triglycerides from palm oil by glycerolysis in the presence of an alkaline catalyst. Analysis of the system of results and calculation equations allowed to offer recommendations for the intensification of production processes: effectively reduces the viscosity of compositions based on cocoa butter, which, in turn, makes it possible to use them for partial replacement of lecithin in the manufacture of confectionery.
Allocation of steady-state areas of total electrical load schedules of 10/0.4 kv transformer substations located in residential areas
Authors: Dovgalyuk Oksana , Shcherbak Iryna , Kovalova Yuliia , Korobka Volodymyr
Published: December 2021

Improving the efficiency of regulating the parameters of distribution network modes is an actual task for the energy sector, requiring a detailed analysis of the nature of the total electrical load graphs of 10/0.4 kV transformer substations. The complexity of the problem in consideration is due to the fact that the load variation of transformer substations 10/0.4 kV in residential areas occurs randomly, due to the significant number, wide range and probabilistic nature of the operating modes of connected consumers, and the lack of deterministic links between consumers of electricity. The investigated function of total load of transformer substations 10/0.4 kV on a daily interval is non-stationary, in this connection there was a necessity of allocation of stationarity areas for adjusting the process of regulation of parameters of electrical network modes. In order to solve this problem, total load graphs for 10/0.4 kV transformer substations located in a residential area were constructed based on experimental measurements of active and reactive loads. The use of these dependencies made it possible to analyse the distribution law for the active and reactive power of the total load of 10/0.4 kV transformer substations, which change in time is stochastic characterised. The use of probabilistic-statistical modelling was justified to reliably describe the load variation process of 10/0.4 kV transformer substations. The hypothesis of a normal law distribution of the functions under consideration was confirmed and parametric tests were performed. Fisher's F-criterion was used to confirm the hypothesis of variance constancy, and Student's t-criterion was used to confirm the hypothesis of mathematical expectation constancy. Using the fact of constancy of dispersions and expectations of investigated mode parameters, autocorrelation coefficients of investigated random functions were determined and autocorrelation function graphs were plotted. In order to approximate the functions under investigation, the autocorrelation function coefficients were determined using the least-squares method, and an analysis of the attenuation of the autocorrelation function was carried out. The calculations carried out have highlighted the areas of stationarity on the total load curves of the 10/0.4 kV transformer substations. These stationarity plots can be used for further modelling of load graphs and the formation of control actions to adjust the load of consumer regulators in order to equalise the overall electrical load graph, as well as for voltage regulation facilities, which will contribute to the required modes of operation of the electricity distribution networks.
Determination of fracture toughness for steel 22k from the results of tests of different types specimens
Authors: Kravchuk Andriy , Kondriakov Ievgen
Published: December 2021

Nowadays, in various industries, in particular in nuclear energy, to determine the fracture toughness, along with standard tests of compact specimens, which are quite expensive and complex, methods are developed to determine these characteristics by impact tests of Charpy specimens using different correlations between Charpy impact fracture energy (CVN) and critical stress intensity factor (J-integral). The paper analyzes correlation and analytical methods, the authors of which consider them universal for a certain class of steels. Correlation methods are divided into one-stage and two-stage. One-stage methods allow to obtain the value of the critical stress intensity factor by the known fracture energy. Two-stage methods in the first stage offer the calculation of the dynamic critical stress intensity factor, in the second the temperature shift and obtaining a static critical stress intensity factor. Analytical methods according to the іmpact fracture diagram of the specimen allow to construct a J-R curve and calculate the value of the J-integral. A series of fracture tests of CT specimens made of heat-resistant steel 22K was carried out, the reference temperature T0 was determined according to the single-temperature method of the ASTM-1921 standard and the Master curve was constructed. A series of standard Charpy specimens impact tests in the temperature range -50…+100°С was performed using an instrumented drop-weight impact testing machine equipped with a high-speed registration system. According to the results of Charpy specimens impact tests, the fracture toughness were determined using different methods. It is established that both analytical and correlation methods cannot be universal and can be used to determine the fracture toughness of 22K steel. Therefore, a new exponential correlation was proposed between the fracture energy of the Charpy specimens and the critical stress intensity factor for heat-resistant steel 22K.
Improvement of recipe of pastille confectionery with the use of chicory and jerusalem artichoke
Authors: Kalyna Viktoriia , Hez Yana
Published: December 2021

It is proposed to strengthen the position of pastille products in the domestic market by expanding the range and increasing the production of dietary and diabetic products. The range of dietary and diabetic confectionery sweets on the Ukrainian market has been studied. The data of the research on violations of dietary norms among the population and the consequences of these violations are analyzed. The functional-technological potential of sugar substitution for inulin-containing raw materials to pastille masses in order to create a functional product has been revealed. A comparative characterization of the chemical composition of chicory and Jerusalem artichoke powders is carried out. The choice of Jerusalem artichoke powder due to the content of slowly digestible carbohydrates that do not cause hyperglycemia in patients with type 2 diabetes is justified. The recipe for the preparation of fruit-based pastille confectionery with the use of chicory and Jerusalem artichoke powders has been improved in order to obtain dietary and diabetic products with increased nutritional and biological value. Rational ratios of prescription ingredients for creating pastille fruit-based confectionery products with satisfactory, organoleptic quality indicators have been established. The recipe uses prescription ingredients: banana, apple, pear and Jerusalem artichoke powder. Organoleptic indicators of the quality of a new product, namely odor, taste, color, shape, surface, were determined by the method of scoring. The optimal prescription ratios of the system (prescription ingredients) "apple - banana - Jerusalem artichoke powder" 23: 73: 4 were experimentally established. A study of the effect of improved pastry powder pastille confectionery on blood sugar in patients with type 2 diabetes is made. There was a decrease in blood sugar in patients with type 2 diabetes. A new fruit-based food product with Jerusalem artichoke powder was obtained with the following advantages - providing diabetics with a safe product that does not raise blood sugar levels in the short term and lowers it in the long term.
Characteristics of diatomite-alginate-Fe3O4 composite as a phosphate adsorbent
Authors: Pasenko Olexander , Frolova Liliya , Shunkin Ihnat
Published: December 2021

Technological approaches to the use of diatomaceous earth as a raw material for the creation of composite adsorbents for wastewater treatment from phosphate ions are analysed. It is shown that the developed surface of diatomite can be used to create a granular adsorbent, and iron (III) oxides (magnetite, goethite, lepidocrocite, ferrihydrite, hematite and goethite) are environmentally safe, cheap, economically feasible modifiers. Emphasis is placed on the possibility of obtaining magnetic granules due to the formation of magnetite. The use of the deposition method for the formation of the applied granular adsorbent is proposed.

 The influence of diatomite concentration on the static strength of granules was established. It is determined that the diameter of the nozzle is also an important factor. The selected technical solutions are aimed at solving the problems of granule hardening and ensuring high adsorption activity. Experimental studies of the synthesis and granulation of the composite adsorbent alginate - diatomaceous earth - magnetite have shown that an increase in the content of diatomaceous earth leads to a natural increase in the size of the granules. When increasing the diameter of the nozzle from 1.5 mm to 3.5 mm, for example, the size of the granules 1.5-4.0 (dc = 1.5 mm), 2.0-5.0 mm (dc = 3.0 mm) and 2.5-5.0 mm (dc = 3.5 mm). The diatomaceous earth content of more than 20% does not allow to carry out high-quality granulation on the experimental installation due to the increase in the viscosity of the suspension. The relationship between the size of gel granules and dried.  The process of application of the active magnetic phase of the adsorbent is investigated. The dependence of the quality of the granulation process on the solid phase content is established. The measured static strength of the adsorbent granules is in the range of 17 - 25 kPa. It is established that the composite adsorbent with the applied layer of magnetite has magnetic properties. The adsorption of PO43- anions from aqueous solutions was studied. For the adsorbent alginate - diatomite and alginate - diatomite - Fe3O4 - the adsorption capacity is 4 and 9 mg PO43- / g, respectively. The obtained composite adsorbents have a set of functional properties that are promising for use in modern water purification and purification systems.
Photocatalytic activity of oxide systems based on doped d-elements of titanium alloys
Authors: Sakhnenko Mykola , Stepanova Iryna , Zyubanova Svitlana , Djenyuk Anatoly , Indykov Sergey
Published: December 2021

CO-, W-, MO- and Zn-containing hetero-oxide nanostructured coatings on titanium and its alloys formed by plasma-electrolyte oxidation in galvanostatic mode from alkaline electrolytes were investigated. The morphology of the surface of the formed coatings was studied by scanning microscopy on the Zeiss Evo 40XVP microscope. The phase composition of the obtained coatings was determined on the X-ray diffractometer Drone-2. Photocatalytic activity of ZnO-WO3/TiO2 films, ZnO-MOO3/TIO2, ZnO-Co3O4/TiO2, CoO-WO3/TiO2 tested in a model reaction of decomposition of an aqueous solution of azobye with a concentration of 12,2·10-5 mol/L (MО) at UV irradiation. It is shown that with plasma-electrolyte oxidation of titanium and its alloys in alkaline diphosphate electrolytes in the mode of «drop-down power» forming heterostructural composites with micro-globular surface morphology. The possibility of controlling the phase and elemental composition of oxide layers, as well as the topography of the surface by changing the composition of the electrolyte and the content of individual components, as well as the modes of formation is confirmed. Heteroxide coatings formed in PEO modes differ in composition and surface morphology, but all exhibit photocatalytic properties of varying degrees of activity. The study of the photocatalytic activity of the obtained coatings in the azo dye decomposition reaction by means of UV testing allowed to rank the heteroxide systems according to the specified parameter. Thus, the degree of decomposition of MF on ZnO-WO3/TiO2 films in 50 minutes was 23 %. Metal oxide systems ZnO-Co3O4/TiO2 had similar characteristics of the degree of decomposition – 21 %. The incorporation of CoO and WO3 oxides into the coating composition reduced the catalytic activity of the system to 19 %. The unstable mode of formation of ZnO-MoO3/TiO2 oxides and the low speed of the process have affected the quality of the catalytic coating activity, reduced the degree of decomposition of MO to values of titanium monoxide Ti/TiO2 without dopants. Comparison of quantitative characteristics of the properties of the obtained coatings allowed to determine the effects of dopants, incorporated into metal oxide systems, on their photocatalytic activity.
Feasibility study of technology of industrial hemp seeds complex processing
Authors: Sova Nataliia , Lutsenko Maryna , Polehenka Maryna , Chornei Kristina
Published: December 2021

In various groups of the population of Ukraine due to an unbalanced diet there is a “hidden hunger”, which leads to a slowdown in intellectual development and reduced productivity, falling production capacity as a result of increased morbidity and disability, as well as catastrophic loss of human potential. The article is devoted to the development of technology for complex processing of industrial hemp seeds. It is shown that the scientific substantiation and creation of the specified technology provides production of food hemp products of high quality, and the amount of waste in their production is minimal. A technological scheme of industrial hemp seeds complex processing has been developed, which consists of two main technological lines: hemp seed felling, production of hemp oil and bulk hemp products. These processes can be both sequential and parallel depending on the needs of production. The scheme provides for the production of only hemp kernel, or only oil and cake, or oil and bulk hemp products (flour, “protein” and bran). According to the developed technological scheme of industrial hemp seeds complex processing, the following ready hemp products were obtained: kernel, oil, “protein”, flour and bran. The technical conditions for these products were developed and approved in 2019 by the director of Desnaland Limited Liability Company. Finished products can be used as stand-alone foods and as ingredients in health food technologies. According to the results of the calculations, the cost of 1 kg of hemp kernel is 226.49 UAH, 1 kg of hemp oil is 206.65 UAH, 1 sachet of hemp oil is 4.13 UAH, 1 kg of hemp “protein” is 503.78 UAH, 1 kg of hemp flour is 16.23 UAH, 1 kg of hemp bran is 39.64 UAH; the level of profitability is 42.1 %, the payback period is 2.1 years. The proposed technology of industrial hemp seeds complex processing can be recommended for use in the agro-industrial sector.
Analysis of geometric parameters and technical requirements for pin conical joints in pump nodes
Authors: Dehtiarov Ivan , Neshta Anna , Samardak Mykola , Kononovych Vitalii , Klok Yaroslav
Published: December 2021

The article analyzes the causes of the situation with the appearance of manufacturing errors and the lack of the necessary technical requirements to perform a pin conical joint his intended purpose. The analysis was performed based on geometric construction of the assembly dimensional chain of two parts to be connected and a conical pin with a taper 1:50 according to GOST 9465-79, which is used in the pin joints of pumping equipment. The geometric analysis included the separation of deviations into linear dimensions and angular deviations. The values of the angular deviations were reduced to the linear values of their projections along the axis of the pin, to determine the tolerance on the end height protrusion of the pin above the surface of the connecting parts. Also, the unfoundedness of assigning the roughness index of the hole under the pin at the level of Ra 1.6 μm and its inexpediency when it is impossible to ensure the required contact length is theoretically proved and the solution of this contradiction is proposed. A detailed analysis of the technical requirements for drawings of pumping equipment units containing pin conical joints and paragraphs of the relevant standards, which resulted in the inconsistencies, and offer recommendations that will ensure the quality of the joint following its official purpose. Analysis of the geometric parameters of pin conical joints for the first time allowed to determine the dependence of the height of the pin end protrusion above the surface of the connecting parts and the tolerance for this parameter, as well as to propose mathematical dependences for their determination. The presented dependencies can be used in practice for a reasonable calculation during the design of pin conical joints in pump nodes and in machine-building enterprises where such joints are used. For the first time, the determination of the tolerance for hole size for machining conical reamers is presented, and the formula for calculating this parameter is proposed, which is given in the recommendations for their use in machine building enterprises and products containing pin conical joints.
Improving the productivity of Pini-Kay fuel briquettes by modernizing the working part of the PSH-250 press
Authors: Dovhopolov Andrii , Nekrasov Sergii , Reuta Zakhar
Published: December 2021

The research related to the productivity of production of fuel briquettes of the "Pini-Kay" type, due to the modernization of the working part of the press line for the production of fuel briquettes with a capacity of 250 kg / h (LVB - 250) was carried out. It is known that the press used on this line is PSH-250, it is the main working equipment of this line, as it serves to press the briquette under temperature and is the closing link in the whole briquette process. In the presented study, the main criterion of productivity was considered to be the number of manufactured products before the break of the splined auger, because the breakdown forces to stop the equipment and replace it. This in turn reduces the number of manufactured products. The paper states that the modernization was carried out as follows: the slot screw, which is the main working body of the press PSH - 250, made of structural steel (steel 45) by casting, was replaced by a slotted screw made by machining on CNC machines, high-quality structural alloy steel 40HMFA. This steel is used to make splined shafts, connecting rods and rods, and is best suited for making a splined auger. In addition, to increase the structural strength, the workpiece of the auger, was made heat treatment - normalization. The proposed technological solution allowed to increase the productivity of fuel briquettes, by reducing the downtime of equipment for repair and replacement of working parts of the press PSH-250. This in turn reduced the company's financial costs for spare parts and affected the cost of finished products. The obtained results show that the slotted augers proposed by the authors allowed to increase the productivity of fuel briquettes production almost 10 times in comparison with the previous results.
PENDEKATAN MUBĀDALAH PERSPEKTIF FAQIHUDDIN ABDUL KODIR DALAM PEMAKNAAN HADIS KEPEMIMPINAN PEREMPUAN
Authors: Zakiyah Zaimatuz , Arifin Zainal
Published: December 2021

Interpretasi teks-teks keagamaan yang diyakini bias gender berimplikasi pada subordinasi dan marginalisasi perempuan dalam berbagai ranah kehidupan. Oleh karena itu, reinterpretasi mutlak diperlukan untuk memulihkan kesenjangan yang ada antara laki-laki dan perempuan. Kajian ini bertujuan memaparkan konsep dasar pendekatan mubādalah dalam perspektif Faqihuddin Abdul Kodir dan mengimplemetasikan pendekatan mubādalah dalam menginterpretasikan hadis kepemimpinan perempuan. Metode yang digunakan adalah penelitian studi literatur menggunakan teknik deskriptif-analitik. Sumber utama dari studi ini adalah buku Qirā’ah Mubādalah, sedangkan sumber sekundernya adalah karya-karya ilmiah yang berkaitan dengan kajian. Hasil studi ini menunjukkan bahwa Faqihuddin Abdul Kodir adalah seorang mufassir feminis asal Indonesia, konsep mubādalah yang ia tawarkan melahirkan relasi ketersalingan yang adil terhadap laki-laki dan perempuan, termasuk dalam diskursus kepemimpinan perempuan, baik dalam ibadah maupun sosial-politik. Meskipun mayoritas ulama melarang perempuan menjadi pemimpin dalam shalat, namun keyakinan tersebut tidak berlaku dalam ranah sosial-politik karena berdasarkan perspektif mubādalah, kepemimpinan tidak didasarkan pada jenis kelamin, melainkan dapat diemban bagi mereka yang memiliki kapasitas dan kemampuan untuk memimpin, sehingga laki-laki dan perempuan dapat bekerjasama dalam menciptakan kemaslahatan di muka bumi.

[Mubādala Approach in the Perspective of Faqihuddin Abdul Kodir on the Meaning of Women's Leadership Hadith. The interpretation of religious texts which is believed to be gender-biased has implications for the subordination and marginalization of women in various spheres of life. Therefore, reinterpretation is necessary to restore the existing gap between men and women. This study aims to explain the basic concepts of the mubādalah approach in Faqihuddin Abdul Kodir’s perspective and to implement the mubadalah approach in interpreting the hadiths of women's leadership. The method used is a literature study research using descriptive-analytic techniques. The main source of this study is the book Qirā’at Mubādala, while the secondary sources are scientific works related to studies. The results of this study indicate that Faqihuddin Abdul Kodir is a feminist exegete from Indonesia, the concept of mubadalah that he offers creates a fair relationship of alienation towards men and women, including in the discourse of women's leadership, both in worship and socio-politics. The majority of scholars prohibit women from becoming prayer leaders, but this belief does not apply in the socio-political realm because based on the perspective of mubādala, leadership is not based on gender, but can be carried out by those who have the capacity and ability to lead, so that they can work together in creating benefit on earth.]
POTENTIAL OF ENDOPHYTIC FUNGI DERIVING FROM ASIATIC PENNYWORTH TO PRODUCE ANTIOXIDANTS
Authors: Susilowati Dwi Ningsih , Radiastuti Nani , Nurhasni Nurhasni , Rustanti Lisca Puji , Tambunan Ika Roostika
Published: December 2021

Asiatic pennyworth is a medicinal plant that contains triterpenoids, saponin, flavonoids, and tannins which possess antioxidants. Endophytic fungi from the plant could produce a similar compound; therefore, antioxidants could be made in the laboratory if the fungi are isolated. This study aimed to evaluate the potential of endophytic fungi isolated from Asiatic pennyworth to produce antioxidants. The study used 34 endophytic fungal isolates from Asiatic pennyworth accessions of Malaysia (17 isolates) and Bengkulu, Indonesia (17 isolates) collected by the Indonesian Center for Agricultural Biotechnology and Genetic Resources Research and Development. The fungi were propagated in a potato dextrose broth medium, then mycelia mats and filtrates were separated and then freeze-dried. The antioxidant activities were first tested with 1,1-diphenyl-2- picrylhydrazyl (DPPH) using thin layer chromatography (TLC), then UV-Vis spectrophotometry λ517 nm with five variations of concentration. Results showed all 34 fungal isolates have antioxidant activities based on a yellowish-white color change after applying 0.002% DPPH solution of the TLC method and IC50 value of the UV-Vis spectrophotometer. The highest antioxidant activity was shown by Aspergillus austroafricanus MB 1 (IC50 = 12.08 ppm) from Bengkulu accession and A. oryzae MM 13 (IC50 = 10.29 ppm) from Malaysia accession. A. austroafricanus MB 1 produced more antioxidant compounds (seven) than A. oryzae MM 13 (six). The antioxidant compounds produced by both endophytic fungi included in the group of flavonoids, fatty acids, and carboxylic acids. The research implies that A. austroafricanus MB 1 and A. oryzae MM 13 could be further developed as sources of antioxidants.
GENETIC ANALYSIS OF QUALITATIVE AND QUANTITATIVE TRAITS AMONG PROGENIES OF ENSET CLONES ORIGINATED FROM SOUTHERN ETHIOPIA
Authors: Bosha Abraham , Gessese Mesfin Kebede
Published: December 2021

The present cultivated enset (Ensete ventricosum) clonal landraces in Ethiopia originated from few wild progenitors. However, enset has a mixed mode of reproduction in which, the wild enset reproduces sexually through seeds, while cultivated enset is generally propagated vegetatively. The objectives of this study were to determine the genetic structure of enset cultivars through genetic analysis of qualitative morphological traits and estimate their genetic variability by evaluating the quantitative agronomic traits data generated from progenies of cultivated and wild enset genotypes. Hence, seeds collected from six cultivated and four wild enset genotypes were used for this study. Data on four qualitative and six quantitative morphological traits were recorded from the progenies of the 10 enset genotypes. Progenies of seven enset genotypes segregated in a 3:1 segregation ratio while progenies of the remaining genotypes segregated differently for the qualitative traits considered. With regard to the quantitative traits, the progenies of the 10 enset genotypes differed significantly for five of the six traits except pseudostem length. The cultivated clones, in general performed better than that of the wild types. Moderate heritability (h2b) estimates and high genetic advances were obtained for leaf length (0.38, 62.0%), pseudostem circumference (0.35, 78.5%), and plant height (0.30, 19.1%) indicating selection for these traits indirectly improves economic yield of enset clones. This study demonstrated the possibility of creating genetic variation through selfing the existing enset genotypes for traits of interest and making improvements either through selection or crossing the elite types to develop novel enset cultivars.
SSR MARKERS REVEALED GENETIC DIVERGENCE OF RICE BROWN PLANTHOPPER POPULATIONS MAINTAINED ON TWO SETS OF DIFFERENTIAL HOST VARIETIES
Authors: Chaerani Chaerani , Yuriyah Siti , Dadang Ahmad , Kusumanegara Kusumawaty , Damayanti Diani , Amir Husin Bahagiawati , Sutrisno Sutrisno , Yunus Muhamad
Published: December 2021

Resistance screening of promising rice lines in Indonesia requires the use of brown planthopper (BPH) biotypes 1, 2, and 3. Three BPH populations have been raised as biotypes 1, 2, and 3 on differential rice host of improved varieties Pelita I-1 (no Bph gene), IR26 (Bph1), and IR42 (bph2), respectively. Three alternative populations have also been developed on the respective traditional varieties TN1 (no Bph gene), Mudgo (Bph1), and ASD7 (bph2). Although these populations displayed two virulent patterns other than biotype 1 to 3 phenotypes, they were expected to be discriminated into two virulence groups by SSR analysis. The study aimed to investigate the level of genetic variation among the six BPH populations using SSR markers and to relate it with the observed virulence patterns. Genotyping of 30 females with 29 polymorphic SSR markers revealed higher genetic parameter values in populations reared on improved varieties than those on traditional varieties. This difference was marked as two population clusters in PCoA plots corresponding to the host variety type, in contrast to the previous assumption that clustering would be based on virulence patterns. The presence of individuals with unwanted virulence allele, either resulting from contamination during the long period of rearing or lack of host adaptation period, is suspected. The result of this study indicates that the six populations are not suitable for resistance screening. Virulence selection must be performed until they attain biotype 1 to 3 phenotypes which can be genetically separated by DNA markers.
POTENTIAL ICE CRYSTAL MARKS FROM PENNSYLVANIAN–PERMIAN EQUATORIAL RED-BEDS OF NORTHWEST COLORADO, U.S.A.
Authors: VOIGT SEBASTIAN , OLIVER KARL , SMALL BRYAN J.
Published: December 2021

The Pennsylvanian–Permian Maroon Formation of northwest Colorado is an up to 4,600 m thick succession of mainly siliciclastic continental red-beds deposited in equatorial intermontane basins of the Ancestral Rocky Mountains. Sedimentary surfaces of fluvio-lacustrine to eolian siltstones and fine-grained sandstones from various stratigraphic levels within the Maroon Formation preserve cm-sized straight to gently curved sediment-filled acicular structures referred to five morphological groups: single, branched, stellate, rosette, and bunched. Depositional environment, shape, and size of the structures are most similar to ice crystal marks that result from freezing of water-saturated fine-grained substrate at the sediment-air interface. They differ from other syngenetically produced crystals and crystal pseudomorphs in sedimentary rocks mainly by crystal shape and environmental conditions. The potential ice crystal marks of the Maroon Formation are notable for the fidelity and morphological diversity of the crystal casts and could be a key for the understanding of similar but hitherto often only called enigmatic structures of the sedimentary rock record. The ice crystal mark occurrences in the Maroon Formation suggest that night frost affected lower elevation equatorial areas during the climax of the Late Paleozoic Ice Age and may stimulate research on evolutionary adaptations of early terrestrial biota to overcome significant air temperature fluctuations.