bluuebunny/crossref_metadata_2025 huggingface dataset:
THEORETICAL BASIСS OF PROVIDING THE TECHNICAL CHARACTERISTICS OF MILITARY AND CIVIL VEHICLES BY JUSTIFICATION OF THE FORM AND PROPERTIES OF THE MATERIALS OF CONTACTING ELEMENTS
Authors: Grabovskiy Andrey , Hrechka Iryna , Tkachuk Mykola M. , Saverska Mariia , Kutsenko Serhii , Sierykov Volodymyr
Published: December 2021

Elements of constructions of modern military and civil vehicles usually work in conditions of high contact loads. Аt the stage of their creation, strength studies are carried out using traditional models of contact of bodies of nominal shape. Нowever, the real structural elements have deviations from such models, which are due to design and technological factors: macrodeviation of the shape, surface roughness, strengthening etc. Such perturbations of nominal parameters have a significant effect on the distribution of contact pressure between the elements of military and civil vehicles, however, traditional methods for studying the stress-strain state of contacting bodies do not make it possible to take such factors into account fully, collectively and exhaustively. To eliminate the existing contradiction, a semi-analytical method is proposed, which is based on the development of variational principles and boundary-element sampling. The created models make it possible to take into account the regularities of the influence of shape perturbations and properties of the surface layers of contacting bodies on the stress-strain state. As a result, it becomes possible to justify favorable perturbations by strength criteria. Such models and methods are offered to the work, and on their basis it’s proposed the implementation of research elements of military and civil vehicles for appointment to ensure world class the technical and tactically technical characteristics.
Ключові слова: military and civilian vehicles; design and technological factor; stress-strain state; contact interaction; strength
COMPUTATIONAL-EXPERIMENTAL STUDY OF CONTACT INTERACTION OF BODIES WITH NEARLY FORM SURFACES
Authors: Grabovskiy Andrey , Tkachuk Mykola А. , Domina Natalia , Tkachuk Ganna , Ishchenko Olha , Voloshina Iryna , Tretyak Vladeslav
Published: December 2021

In many constructions, their elements are in contact with nominally matching (congruent) surfaces. In reality, this contact is disturbed due to deviations in the shape of these surfaces from the nominal. To study the effect of this perturbation on the distribution of contact pressure, the analysis of the stress-strain state of the body system of punched sheet-die is carried out. The middle element of this system deviates from the nominally flat shape. This causes a change in the contact pressure distribution. The proportionality between the clamping force and the level of contact pressure is also lost. The reliability and accuracy of the results obtained by numerical calculation have been experimentally confirmed.
Keywords: stress-strain state; contact pressure; contact interaction; method of variational inequalities; Kalker variational principle; finite element method
CONTACT INTERACTION OF A TORSION SHAFT WITH A SPLINED BUSH IN ELASTICALLY PLASTIC DEFORMATIONS
Authors: Grabovskiy Andrey , Tkachuk Mykola M. , Zavorotnii Anton , Kutsenko S Serhii , Saverska Mariia , Klochkov Illia , Tkachuk Mykola А. , Zinchenko Olena , Dereviankin Roman
Published: December 2021

Torsion shafts are the main elastic element of the suspension systems of a large number of vehicles. To simulate their reaction to the action of torque, the stress-strain state is analyzed taking into account the contact interaction with the spline sleeve. The features of the distribution of contact pressure between these bodies are established. The nature of stress concentration in the splined hollows of the shaft head is determined. Models and research methods have been developed that make it possible to develop recommendations for design decisions in the design of vehicle suspension systems. The factors are determined that ensure the strength of the torsion shaft at the values of its head diameters close to the diameters of the torsion shaft stem. In the case under consideration, this factor is firstly strength of the torsion shaft head. In particular, it was found that during manufacturing operations there are significant plastic deformations and contact loads in the heads of torsion shafts. This factor is decisive in substantiating the design parameters of torsion shafts.
Keywords: torsion shaft; contact interaction; stress-strain state; elastically plastic deformation; suspension system
ANALYSIS THE REACTION OF LIGHTARMOR MACHINES ON THE ACTION OF POLYPULSES FORCES
Authors: Grabovskiy Andrey , Tkachuk Mykola M. , Nabokov Anatoly , Lytvynenko Olexandr , Tkachuk Ganna , Rіkunov Oleg , Kutsenko Serhii , Panchenko Volodymyr , Kyslytsia Denys
Published: December 2021

In modern conditions, lightarmored vehicles with powerful weapon modules are widely used in the armies of different countries. These modules are equipped with small-caliber automatic cannons, which have a rate of fire of several hundred rounds per minute and a high level of recoil forces. Moreover, there are tendencies towards an increase in the rate of fire and the caliber of weapons (and, accordingly, recoil forces). Considering that weapon modules rely on the lightarmored vehicles skeleton, which has higher responsiveness characteristics than heavy combat vehicles in terms of weight, the problem of determining the reaction of the «weapon module - armored hull - suspension» system to the action of recoil forces in order to ensure on the one hand, the strength of armored hulls, and on the other hand, reducing the load on the guidance and stabilization system of weapons during firing.To study the response of elements of lightly armored vehicles to the action of recoil forces when firing a burst of combat modules, numerous models have been built with a small number of degrees of freedom. Using these models, the reaction of a dynamic system to the action of a number of impulses was investigated.These impulses caused by the action of recoil forces when firing shots from combat modules.
Keywords: lightlyarmored vehicle; weapon module; small-bore automatic cannon; recoil force targeting and weapon stabilization system; dynamic system; numerical modeling; method of finite elements; natural vibration frequency
HISTORY OF DEVELOPMENT AND MANUFACTURE OF TRACTORS AND PRIME-MOVERS BY THE STATE ENTERPRISE «KHARKIV DESIGN BUREAU OF ENGINEERING NAMED AFTER A. A. MOROZOV» AND STATE ENTERPRISE «MALYSHEV PLANT» (REVIEW ARTICLE)
Authors: Pysarska Nataliia , Iepifanov Vitalii , Nazarenko Sergej
Published: December 2021

The review article systematizes information and studies the  history of designing tractors and prime-movers at the State Enterprise «Kharkiv Design Bureau for Mechanical Engineering named after A. A. Morozov» and their manufacture by the State Enterprise «Malyshev Plant » from the origin of such production in Kharkiv to the present time. The role of Kharkiv in providing the country with special equipment is revealed. Detailed biographical information about chief designers of this technique (B. N. Voronkov, N. G. Zubarev, M. N. Shchukin, A. I. Avtomonov, M. D. Borisyuk, A. D. Motrich, M. P. Kalugin, P. I. Sagir, B. I. Kalchenko) provided, their role in the development and improvement of designs of special-purpose machines is indicated. The main technical characteristics of basic models of tractors and prime-movers are presented. The main problems in the production of these types of equipment are mentioned. The article contains information about various modifications of AT-T, their main differences and purposes are indicated.
Keywords: tractor, prime-mover, SE «Kharkiv Design Bureau of Engineering Named after A. A. Morozov», SE «Malyshev Plant», National Technical University «Kharkiv Polytechnic Institute»
ALGORITHM FOR EVALUATING MILITARY TECHNICAL EFFICIENCY OF USING MILITARY VEHICLE EQUIPMENT BY PARTS AND DIVISIONS OF THE NATIONAL GUARD OF UKRAINE IN THE COURSE OF BATTLE ACTIONS (OPERATIONS)
Authors: Rikunov Oleg , Kuzhelovych Viktor Viktor
Published: December 2021

The article argues the relevance of determining the indicator of military-technical efficiency of the use of military automobile equipment by units and subunits of the National Guard of Ukraine when performing battle actions (operations). Currently, special indicators are used to assess the state of military automotive equipment, which are a numerical expression of the gauges or their relationship. Existing methods of planning technical support, methods for predicting the quantitative assessment of the military-technical efficiency indicator of the use of military automotive equipment during hostilities need further improvement. The article proposes to use a comprehensive indicator, a generalized coefficient of military-technical efficiency of using military automobile equipment during combat actions (operations), as an indicator of military-technical efficiency of using military automobile equipment in combat conditions, and to determine directions for increasing the efficiency of using military equipment.

Keywords: automotive technical support; military automotive equipment; military-technical efficiency of using military automobile equipment; performance indicators; technical readiness coefficient; machine use efficiency during battle actions (operations)
APPLICATION OF THREE-DIMENSIONAL MODELING TO OPTIMIZE THE DIMENTIONS OF THE SPEED CONTROL DEVICE WITH ROTARY STOPPER IN THE FORM OF A CLOSED-LOOP HYDRAULIC SYSTEM
Authors: Strilets Oleh , Malashchenko Oleh , Stepaniuk Anton
Published: December 2021

The aim of this work is to create a three-dimensional model of a new speed change control device using an engineering CAD system Solidworks. In particular, the article describes the methods of computer construction of a three-dimensional model of a rotary stopper in the form of a closed-loop hydraulic system of the device for smooth control of speed changes through a gear differential. The control link can be either a ring gear, or a carrier, or a sun gear. Ways of creating new parts of the device, use of elements from standard libraries and coordination of their dimensions in assembly have been considered. The ability to parameterize the dimensions allows you to automate the creation of both a single part and the whole device of a particular design, based on the specified source data. The application of special meshes for modeling movable and fixed joints allows you to correctly place the parts, control the correctness of their assembly, and then conduct kinematic and power studies of the device, animate its elements in motion. It has been concluded that the use of computer three-dimensional modeling in the design of such stoppers allows: at the initial stage of design to get a visual idea of the stopper of rotational motion; use a computer to view the created model from any point; easy to edit three-dimensional models, i.e. make the necessary changes; achieve great savings in time and design costs; get a large number of possible design solutions that need to be analyzed in detail and in depth to choose the rational, i.e. the best fit. The created model of the stopper of rotational movement allows to choose the optimal place of its installation in a gear differential of the device of speed change from the point of view of use of the minimum sizes and volume. Based on this, computer simulation must precede design.
Keywords: three-dimensional modeling; rotary stopper; closed-loop hydraulic system; gear differential
SUBSTANTIATION OF DESIGN DECISIONS OF ELEMENTS OF MILITARY OBJECTS IN CONDITIONS OF CONTACT AND PLASTIC DEFORMATION
Authors: Tkachuk Mykola M. , Saverska Mariia , Grabovskiy Andrey , Kutsenko Serhii
Published: December 2021

New design solutions, technologies and materials are required to improve tactical and technical characteristics of military equipment. Often this implies operation in such conditions as contact interaction and elasto-plastic deformations of materials. New models and research methods are developed for better utilization of modern materials and improved performance of military equipment. They account directly for complex physical and structural nonlinearities. The properties of conventional and novel materials are determined both in bulk and on surfaces at microstructural level. This will enable physically adequate and mathematically correct analysis of stress-strain state. The new advanced design solutions will emerge through the objective-driven search by means of parametric modeling. The project will extend traditional local problem statements with newly developed variational principles that account for structural and physical nonlinearity and are suitable for parameterization. This will create the basis for fundamental analysis of torsion bar suspensions, hydrovolumetric and gear drives and other crucial components of combat vehicles, engineering solutions for domestic manufacturers of military equipment that will bring their tactical and technical characteristics to highest modern standards.

Keywords: contact interaction; stress-strain state; intermediate layer; contact pressure; contact area; plastic deformation
ANALYTICAL REVIEW OF RESEARCH AND DEVELOPMENT OF ELEMENTS OF SUSPENSION SYSTEMS OF ARMORED VEHICLES OF LIGHT CATEGORY BY MASS (REVIEW ARTICLE)
Authors: Zinchenko Olena
Published: December 2021

The analysis of materials on the design of light armored vehicles is carried out. The main mathematical models for modeling dynamic processes, stress-strain state in the system "combat module - hull - suspension" are considered. The publications on the design of suspension torsion bars are analyzed. To date, the analysis and synthesis are not united by a single generalized parametrical description, which would cover both technical solutions of elements of suspension of light armored vehicles, modes of motion of these machines, and properties of materials of the elements under study, and requirements for tactics and technical characteristics in general. That is, there is no corresponding theoretical base for solving the problems of parametric synthesis of elements of suspension systems,  and existing mathematical models need to be improved. Therefore, the main tasks that need to be solved or improved by existing solutions are set. Also, such developments are needed that would take into account technical solutions, processes and conditions, stages of manufacture, operating conditions and combat use, that is, those that would reflect all stages of the life cycle of the elements of suspension systems for light armored vehicles.
Keywords: light armored vehicle; tactical and technical characteristics; torsion bar; suspension systems; sprung part; suspension; stress-strain state
COMPUTATIONAL AND EXPERIMENTAL METHOD FOR ESTIMATING THE RESIDUAL LIFE OF GEARS BASED ON VIBRATION MONITORING DATA
Authors: Ishin Nikolay , Gavrylov Serhii , Goman Arkadiy , Skorokhodov Andrey , Dakalo Juriy
Published: December 2021

A computational and experimental method for estimating the residual life of gears in the inter-repair period is proposed. The method is based on the main provisions of the theory of vibration-pulse diagnostics of spur gears, developed at the OIM of the National Academy of Sciences of Belarus. The main performance criteria are the contact and bending endurance of the teeth. Accounting for changes in the value of the coefficient of internal dynamic load in the gearing during the operation of gears is carried out on the basis of vibration analysis during their vibration monitoring. The proposed method makes it possible to estimate the residual life of the gear mechanism at any stage of operation, providing the opportunity to organize the transition from planned preventive maintenance of machines to maintenance according to the actual condition. An example of estimating the residual life of a gear pair that limits the reliability of a two-row planetary gear motor-wheel of a heavy-duty dump truck is given.
Keywords: gear transmission; vibration monitoring; residual life; inter-repair period; internal dynamic load in engagement
Principle of torque formation with reduced pulsation in switched reluctance motor with U-shaped poles
Authors: Verbytskyi Ievgen , Lukianov Mykola , Bondarenko Iuliia
Published: December 2021

In the paper the types of motors for vehicles and highlights the switched reluctance motor type as one that has a simple design, high reliability and low cost. The principle of operation of switched reluctance motors (SRM) and their modifications are given. However, the widespread use of SRM in vehicles is constrained by the low specific torque and its high ripple. To increase the specific torque, a paired winding of windings on adjacent rods of U-shaped stator poles is proposed. The principle of formation of rotational force is shown and the estimation of efficiency of use of the electric power for its formation is offered. The COMSOL Multiphysics software environment analyzes the advantages and disadvantages of using U-shaped poles with a trapezoidal and rectangular profile, and selected the latter because of the greater torque at the same dimensions. It is shown that the width of the pole rods with a rectangular profile to ensure maximum torque should be about a third of the width of the base of the pole. A typical form of current of the pole winding, which minimizes the pulsation of the moment, is analyzed. The expediency of designing a specialized electric drive for the proposed topology of SRM and synthesis for it of the control law, which provides the required value of the moment with minimal ripple, is substantiated. As usual, to ensure the constant moment generated by the pole in a certain sector it is necessary to form a current of near trapezoidal shape in the pole winding. As a result of the research, conclusions were made about the possibility of reducing the cost of SRM technology when using a modular structure based on U-shaped poles with paired winding at the stator poles, in which the windings are wound on the rod of two adjacent poles, which allows them to be placed compactly the use of additional space and, accordingly, provides a greater density of the poles. Modeling the process of forming the torque of the motor in the COMSOL Multiphysics software environment showed the advantages of using poles with a rectangular profile compared to trapezoidal poles and confirmed the feasibility of using poles with a rod width of about a third of the pole base width.
Improving the recipe of a confectionery product based on chickpea flour and cranberries
Authors: Kalyna Viktoriia , Hez Yana , Kuzo Oksana
Published: December 2021

The results of researches of influence of gluten-free chickpea flour on quality of confectionery are presented. A systematic analysis of scientific and technical information of Ukrainian and foreign scientists and formulated a working hypothesis on the possibility of using alternative ingredients in the production of confectionery. The object and subject of research are selected: technology for the production of cupcakes; chickpeas flour, strawberries cranberries. The chemical composition of chickpea and wheat flour is characterized by the quantitative content of proteins, fats, carbohydrates, minerals, vitamins. It was found that chickpea flour can be an alternative source of protein, it contains in the vast majority necessary for the full development of the human body calcium, phosphorus, magnesium. On the basis of the performed experimental researches the recipe of cakes with use of industrial samples is developed: chickpea flour of TM "Organic-Eco-Product", cranberries dried of TM "Bakalland", chicken eggs of category C1, granulated sugar of TM "Svoi Liniya", sweet butter 72,6 % TM "Belotserkivske" and baking powder TM "Dr.Oetker". Effective technological parameters and rational ratios of prescription ingredients for creating a cake have been established. Drawings of experimental samples of cupcakes are presented and characterized. The method of scoring has shown that the use of chickpea flour in the technology of confectionery production affects the organoleptic characteristics of the quality of finished products and structural and mechanical properties of the crumb. Consumer surveys and questionnaires were conducted in the city of Dnipro in ATB and Varus supermarkets to determine the general opinion about food. Ukrainians were interviewed: "Do you pay attention to new products that appear on the market?", "How often do you buy pastries in the store?". It was found that 50% of consumers pay attention to new products and 47% buy pastries every day. It is substantiated that the use of the proposed formulation will allow to obtain a new product based on chickpea flour, which will provide people with celiac disease with quality treatment and prevention products.
Mechanisms of structural-phase transformations during crystallization of solder melt under conditions of magnetic-dynamic influences for carbide tools
Authors: Kuzey Anatoliy , Lebedev Vladimir , Tsykunov Pavel , Slipchuk Andrey
Published: December 2021

The processes of melt formation were studied by methods of optical and electron scanning microscopy. These processes occur during induction brazing of a hard alloy to a steel holder and contact interaction of low-melting (copper-zinc system alloy) and refractory (iron-nickel) components of the solders. It is shown that the effect of a thermal and magnetic-dynamic high-frequency electromagnetic field on the components of the composite solder is how a high-strength solder joint is formed. The structure is forming by disperse hardening mechanism. The research of the contact interaction process for low-melting and high-melting components of solders during the soldering process of the tool showed that the formation of solder in brazed seams occurs through a number of stages and this does not lead to the formation of microstructures that are characteristic of alloys based on copper-iron-phosphorus, copper-zinc-nickel and copper-zinc-iron. Thus, the use of composite solders can reduce the soldering temperature by 40-50 K and increase the concentration of alloying species in the solder and change its structure. These advantages of composite solders reduce the thermal impact on contact materials, increase the strength of the weld and allow you to control the thickness of the brazed weld, and this is important when soldering hard alloys of WC-TiC (TaC) systems. High initial dissolution rates of nickel particles in the copper-zinc melt and the solubility of copper, zinc in nickel lead to the formation in the melt of quasi-liquid particles of the nickel alloy. When the melt is cooled, particles other than the surrounding alloy composition are formed. They are morphologically related to the grain structure of the solder. The formed alloy (solder) has the structure of a composite material in which the metal particles are enriched in nickel, and have the role of a reinforcing element.
Electrochemical deposition of cobalt alloy
Authors: Nenastina Tetiana , Sakhnenko Мykola , Proskurina Valeria , Korohodska Alla , Horokhivska Natalia
Published: December 2021

Electrodeposition of cobalt alloys with refractory metals makes it possible to obtain coatings with a unique combination of physicochemical properties that are unattainable using other deposition methods. For the deposition of high-quality coatings with a cobalt-vanadium alloy, it is proposed to use a citrate electrolyte. Co-V coating was deposited on steel samples from citrate electrolyte at a temperature of 35-40 °C and a current density of 5-12 A/dm2 using soluble cobalt anodes. The vanadium content in the coating deposited at a ligand concentration of 0.3 mol / dm3 is 0.1-0.5 wt%. An increase in the concentration of the ligand to 0.4 mol / dm3 promotes the binding of cobalt into complexes, and, accordingly, the vanadium content in the coating increases to 0.6-1.2 wt.%. Moreover, the tendency to change the percentage of alloying elements with current density remains. Deposition coatings are dense, shiny, without internal stresses and cracks. The proposed compositions of electrolytes and modes of deposition of Co-V coatings with a vanadium content of up to 1.5 wt.% And a current efficiency of 50%. It was found that Co-V coatings are characterized by increased carbon content and are substitutional solid solutions, and the surface morphology of the obtained coatings depends significantly on the current density and changes from fine-crystalline to globular spheroid. The optimal current density for obtaining high-quality coatings with a cobalt alloy in a galvanostatic mode is ік = 10 A / dm2. Management of the storage of galvanic cobalt alloys in a quite wide range of concentrations of alloy-forming components is achieved by varying the electrolysis parameters, which allows the deposition technology to be adapted to the needs of the modern market.
Analysis of methods and methods of diagnosing internal combustion engines by non-assembly control methods
Authors: Bilyk Serhii , Bozhko Eduard
Published: December 2021

The question of interaction of schemes of diagnostics of engines by methods of non-disassembled control is considered, the analysis of existing methods is executed, and the use of the complex approaches increasing reliability of work of engines is offered. Methods of non-detachable diagnostics with modeling of deregulation of engine systems during operation and diagnosing the initial stages of structural and functional malfunctions are analyzed. The analysis allowed to determine the direct diagnostic parameters that unambiguously characterize the state of the object and indirect, associated with direct functional dependencies, and identify the most effective, in terms of determining correlations - direct diagnostic methods, which include, for example, indication of the working process in the engine cylinder. A relatively simple scheme of measuring and determining signals from several diagnostic elements simultaneously is proposed, from which we can conclude that information from one measurement channel can comprehensively characterize the technical condition of several elements of engine mechanisms or systems: vibration method, acoustic method, gas chromatography methods, indirect indication by determining the stress in the studs of the cylinder head, assessing the level of wear of parts on the metal content in the engine oil, as well as diagnosing the parameters of the uneven speed of the crankshaft. Analysis of methods and techniques for diagnosing internal combustion engines led to the conclusion that the method of diagnosing the uneven speed of the engine crankshaft is a promising direction in the development of methods of non-demountable diagnostics of internal combustion engines. residual life and monitor the technical condition of the engine.
Improving of the vector control system structure of the active controlled rectifier
Authors: Krylov Denis , Kholod Olga
Published: December 2021

The vast majority of electricity is used by industrial facilities in a converted form. At the same time, the use of semiconductor converters to obtain the required load parameters is intensively increasing. Current trends in the development and improvement of semiconductor converters are aimed at energy saving by improving their quality of work and reducing the impact on the power supply, load, and related consumers. Frequency converter with DC insert has become widespread and widely used. Its scheme is mainly based on an uncontrolled diode rectifier and an autonomous voltage inverter. Uncontrolled rectifiers are simple and reliable, but have two main disadvantages: the impossibility to recover electricity to the supply network and distortions of the source current shape. We can get rid of these disadvantages by using an active rectifier made according to the voltage source scheme instead of an uncontrolled rectifier. The operation of an active rectifier significantly depends on the type of its control system structure. This article aims to to improve the structure of the switches control system of the active rectifier scheme – voltage source built using a vector calculation algorithm; creation of a MatLab model of a three-phase active-controlled rectifier operating with a fixed modulation frequency and analysis of the influence of the input inductance value on the quality of its operation. The simulation results confirm that the improved structure of the vector control system proposed by the authors ensures high-quality operation of the active rectifier and electromagnetic compatibility of the frequency converter with the power supply network at the level allowed by the standards; simplification of the representation mathematical apparatus of the generalized vectors of currents and voltages at the construction of a vector control system of the active rectifier – voltage source practically did not influence qualitative indicators of the converter work in any way; a network filter must be used to eliminate the final distortions introduced into the source voltage by an additional nonlinear load.
A model predictive controller of the blowing mode during basic oxygen furnance process
Authors: Stepanets Oleksandr , Mariiash Yurii
Published: December 2021

Today in Ukraine and the world, the problem of energy saving and reducing the cost of smelted steel is state of art. Metallurgical enterprises are developing in conditions of fierce competition, the main reason is that Ukrainian products are extremely energy-intensive due to the depreciation of fixed assets and outdated technological processes. The basic oxygen furnace process is a process of producing steel from liquid cast iron with the addition of steel scrap to the converter and blowing oxygen from above through a water-cooling lance. Nowadays, the production of steel by BOF process is the most popular in the world and is becoming increasingly common. The main disadvantage of the basic oxygen furnace is the need to provide the initial amount of heat (in the form of liquid cast iron) and as a consequence - restrictions on the processing of scrap metal. Reducing the cost of basic oxygen furnace steel is achieved by increasing the share of scrap metal by increasing the degree of afterburning of CO to CO2 in the cavity of the converter, by optimal control of the parameters of the blast mode using model-predictive control. The principle of model-predictive control is based on a mathematical model of the plant. This approach minimizes the functional that characterizes the quality of the process. The linear-quadratic functional was chosen. A forecasting model is proposed taking into account the constraint on changing the position of the lance and the pneumatic oxygen supply valve. It was found that the change in the rate of decarburization of the metal depends on the distance of the lance to the level of the quiet bath and affects the degree of afterburning of CO to CO2. The decarburization process is non-stationary, described by a first-order inertial model, the transfer coefficient and time constant of which depends on the melting period and the duration of the purge. The mathematical model of the blast mode of oxygen-converter melting has been improved, taking into account the influence of the blast intensity on the decarburization process of the bath, which allowed to increase the accuracy and quality of blast control in terms of changing oxygen flow during purging. The simulation results of the automatic control system show that the model-predictive regulator provides the required level of carbon dioxide in the converter gases when the flow rate of oxygen for purge changes.
EFFECT OF AMELIORANT ON GROWTH AND YIELD OF RICE AT TIDAL PADDY FIELD
Authors: Minarsih Sri , Karyaningsih Sri , Samijan Samijan , Supriyo Agus , Hindarwati Yulis , Husna Nadhifa , Winarto Budi
Published: December 2021

Rice (Oryza sativa L.) is the most important and strategic food crop in Indonesia, but low productivity in tidal paddy fields is a serious problem that must be overcome. The application of ameliorant would be worthy to increase the growth and yield of rice in tidal paddy fields. The study aimed to investigate the effect of ameliorant application on growth and yield of rice varieties in tidal paddy fields. The study was arranged in a split plot design with five replications. Rice varieties tested were Inpari 34, Dendang, Inpara 9, Inpari 35, and Ciherang as the main plot, and ameliorant types studied were humic acid, gypsum, zeolite, and organic fertilizer as the subplot. The results showed that the use of different rice varieties and amelioran types significantly increased the growth and yield of rice. Inpara 9 produced 7.6 t.ha-1 dry milled grain (DMG) or increased by 33.3% compared to Ciherang variety. Humic acid application at 25 kg ha-1 increased grain yield by 21.3% higher than that without ameliorant treatment. The best treatment to increase the growth and yield of rice in tidal paddy field was a combination of humic acid 25 kg.ha-1 and Inpari 34 which produced the DMG of 8.6 t ha-1 or 41% higher compared to Ciherang without ameliorant.
Enhanced All-Optical Y-Shaped Plasmonic OR, NOR And NAND Gate Models, Analyses, And Simulation For High Speed Computations
Authors: Charles Ipshitha , Sreev Alluru , Krishna SabbiVamshi , Swarnakar Sandip , Kumar Santosh
Published: December 2021

In this digital era, all-optical logic gates (OLGs) proved its effectiveness in execution of high-speed computations. A unique construction of an all-optical OR, NOR, NAND gates based on the notion of power combiner employing metal–insulator–metal (MIM) waveguide in the Y-shape in a minimal imprint of 6.2 µm × 3 µm is presented and the structure is evaluated by finite-difference time-domain (FDTD) technique. The insertion loss (IL) and extinction-ratio (ER) for proposed model are 6 dB and 27.76 dB for NAND gate, 2 dB and 20.35 dB for NOR gate and 6 dB and 24.10 dB respectively. The simplified model is used in the construction of complex circuits to achieve greater efficiency, which contributes to the emergence of a new technique for designing plasmonic integrated circuits.
Application of Pier Waste Sludge for Catalytic Activation of Proxy-monosulfate and Phenol Elimination From a Petrochemical Wastewater
Authors: Khoshtinat Feyzollah , Tabatabaie Tayebeh , Ramavandi Bahman , Hashemi Seyedenayat
Published: December 2021

This investigation aimed to remove phenol from a real wastewater (taken from a petrochemical company) by activating peroxy-monosulfate (PMS) using catalysts extracted from pier waste sludge. The physical and chemical properties of the catalyst were evaluated by FE-SEM/EDS, XRD, FTIR, and TGA/DTG tests. The functional groups of O-H, C-H, CO32-, C-H, C-O, N-H, and C-N were identified on the catalyst surface. Also, the crystallinity of the catalyst before and after reaction with petrochemical wastewater was 103.4 nm and 55.8 nm, respectively. Operational parameters of pH (3-9), catalyst dose (0-100 mg/L), phenol concentration (50-250 mg/L), and PMS concentration (0-250 mg/L) were tested to remove phenol. The highest phenol removal rate (94%) was obtained at pH=3, catalyst dose of 80 mg/L, phenol concentration of 50 mg/L, PMS concentration of 150 mg/L, and contact time of 150 min. Phenol decomposition in petrochemical wastewater followed the first-order kinetics (k> 0.008 min-1, R2> 0.94). Based on the reported results, it was found that the pH factor is more important than other factors in phenol removal. The catalyst stability test was performed for up to five cycles and phenol removal in the fifth cycle was reduced to 42%. Also, the energy consumption in this study was 77.69 kw.h/m3. According to the results, the pier waste sludge catalyst/PMS system is a critical process for eliminating phenol from petrochemical wastewater.
Construction and Genetic Analysis of a Worldwide Core Collection of Rapeseed
Authors: Guo Yiyi , Xu Ying , Yan Tao , Jiang Lixi , Dong Jie , Wu Dezhi , Kuang Liuhui
Published: December 2021

Rapeseed (Brassica napus) is an important oilseed crop, which is widely planted in the world. In a previous study, we collected 991 accessions of rapeseed from the worldwide germplasm and revealed genetic polymorphisms within these germplasm by whole-genome resequencing. However, management of such a large amount of accessions is time-consuming, laborious and costly. Therefore, we constructed a core collection of rapeseed consisting of 300 worldwide accessions based on their genetic diversity. Compared with 991 accessions, the worldwide core collection showed similar geographic distribution, the proportion of three ecotypes, nucleotide diversity and the associated SNPs of flowering time. Besides, we identified FT ortholog (BnaA02g12130D) and FLC ortholog (BnaA10g22080D) responsible for flowering time and ecotype differentiation through selective sweep analysis and genome-wide association analysis (GWAS) of flowering time using the rapeseed core collection. FT and FLC are two well-known genes regulating flowering time in Arabidopsis. These results indicate that the worldwide core collection can represent the genetic diversity of 991 worldwide accessions, which could be more efficiently used for phenotypic and genetic studies in rapeseed.
Science for Social Licence to Arrest an Ecosystem-Transforming Invasion
Authors: Mason Norman W.H. , Kirk Nicholas A. , Price Robbie J. , Law Richard , Bowman Richard , Sprague Rowan I.
Published: December 2021

The primary role for science in addressing complex environmental problems, such as biological invasions, is generally assumed to be as a guide for management decisions. However, science often plays a minor role in decision-making, with practitioners instead relying on professional experience and local knowledge. We explore alternative pathways by which science could help reduce the spread and impacts of invasive species. Our study centred on attempts to understand the science needs of three local governance bodies responsible for the management of invasive (wilding) conifer species in the southern South Island of New Zealand. We used a combination of workshop discussions, questionnaire responses and visits to field sites to elicit feedback from study participants. We applied a mixed inductive-deductive thematic analysis approach to derive themes from the feedback received. The three main themes identified were: 1) Impacts of wilding conifers and goals for wilding conifer control; 2) barriers to achieving medium- and long-term goals; and 3) science needed to support wilding conifer control.Participants identified both instrumental (e.g. reduced water availability for agriculture) and intrinsic (e.g. loss of biodiversity and landscape values) impacts of wilding conifer invasions, with long-term goals focussed on avoiding or reversing these impacts. Barriers to achieving goals were overwhelmingly social, relating either to unwillingness of landowners to participate or poorly designed regulatory frameworks. Consequently, science needs related primarily to gaining social licence to remove wilding conifers from private land and for more appropriate regulations. Participants did not perceive any need for additional scientific information to guide management decisions, relying instead on professional experience and local knowledge. International experience suggests that invasive species control programmes often face significant external social barriers. Thus, for many biological invasions the primary role for science might be to achieve social licence and regulatory support for the long-term goals of invasive species control programmes and the management interventions required to achieve those goals.
Predicting Inflation Component Drivers in Nigeria: A Stacked Ensemble Approach
Authors: Akande Emmanuel , Akanni Elijah , Taiwo Oyedamola F. , Joshua Jeremiah D. , Anthony Abel
Published: December 2021

Our study examined the disaggregation of inflation components in Nigeria using the stacked ensemble approach, a machine learning algorithm capable of compensating the weakness of a base learner with the strength of another. This approach gives flexibility of a synergistic performance of stacking each base learner and produces a formidable model that yields the highest level of accuracy and best predictive ability. We analyzed the test data, out-of-sample, and our results show a strong accuracy in predicting inflation. Our results further show that food CPI is the most important driver for headline, urban, and rural inflation while bread and cereals is the most important driver for food inflation. However, biscuits, agric rice, garri white are among the top main drivers of bread and cereal inflation. We note that some CPI items that mostly drive inflation have lower weights while others have higher weights therefore, focusing entirely on CPI weights as a policy guide will stymied a successful control of inflation in Nigeria. In addition, ignoring CPI items with lower weights in policy intervention will make inflation difficult to control. Above all, adequate trace of the source of inflation to the least sub-component of each component will help address or formulates an appropriate policy to confront inflation problems in Nigeria.JEL: C53, E37
The Immediate Impact of Physical Function and Quality of Life After Hematopoietic Stem Cell Transplantation
Authors: Lee YeJi , Kim Inho , Koh YoungIl , Shin DongYeop , Hong JunShik , Lee CHANG WON , Seo Kwan Sik
Published: December 2021

Purpose: Although hematopoietic stem cell transplantation (HSCT) is a curative treatment for hematologic malignancies, HSCT survivors often experience declined physical function and quality of life (QoL). However, the physical function and QoL changes in acute posttransplant patients remain unclear. This study aimed to monitor changes in physical function and QoL after HSCT. Method: This retrospective controlled cohort study included 107 HSCT patients. Physical function was evaluated weekly from admission to discharge using the de Morton Mobility Index (DEMMI). Impaired physical function was defined as a baseline raw ordinal DEMMI score of < 17 and a decrease of ≥ 2 points. We collected the Visual Analogue Scale (VAS), European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ-C30), and Zung Self-rating Depression Scale (SDS) at enrollment and discharge.Results: Based on the DEMMI scores, 41 patients (38.3%) showed impaired physical function. A notable decrease in the DEMMI score was found in the first week after HSCT. In the EORTC QLQ-C30, physical function differed between the groups at admission and discharge. The good physical function group showed better cognitive function and social function. For the SDS, the impaired physical function group showed significantly higher depression at discharge. Conclusion: A third of the patients showed physical impairment during the acute transplant period. Patients with low physical function suffered more from depression and lower QoL. Evaluating patients’ pretransplant physical function and early detection is needed as impaired physical function mainly occurs at 1 week post-transplant.
Large-Scale Engineering and Cryopreservation of hiPSC-Derived Nephron Sheets
Authors: Wiersma Loes E. , Avramut M. Cristina , Lievers Ellen , Rabelink Ton J. , Berg Cathelijne W van den
Published: December 2021

Background The generation of human induced pluripotent stem cells (hiPSCs) has opened a world of opportunities for stem cell-based therapies in regenerative medicine. Currently, several human kidney organoid protocols are available that generate organoids containing kidney structures. However, these kidney organoids are relatively small ranging up to 0.13 cm2 and therefore contain a small number of nephrons compared to an adult kidney, thus defying the exploration of future use for therapy. Method We have developed a scalable, easily accessible, and reproducible to increase the size of the organoid up to a nephron sheet of 2.5 cm2 up to a maximum of 12.6 cm2 containing a magnitude of nephrons. Results Confocal microscopy showed that the subunits of the nephrons remain evenly distributed throughout the entire sheet and that these tissue sheets can attain ~30,000-40,000 glomerular structures. Upon transplantation in immunodeficient mice, such nephron sheets became vascularized and matured. They also show reuptake of injected low-molecular mass dextran molecules in the tubular structures, indicative of glomerular filtration. Furthermore, we developed a protocol for the cryopreservation of intermediate mesoderm cells during the differentiation and demonstrate that these cells can be successfully thawed and recovered to create such tissue sheets. Conclusion The scalability of the procedures, and the ability to cryopreserve the cells during differentiation are important steps forward in the translation of these differentiation protocols to future clinical applications such as transplantable auxiliary kidney tissue.
Spatial-Temporal Variations and Socio-Economic Influencing Factors of Air Quality in China’s Major Cities During COVID-19
Authors: Yan Xinlin , Sun Tao
Published: December 2021

Due to the emergence of COVID-19 in Wuhan in January 2020, the central government of China announced that Wuhan was in "lockdown," the activities of the country's citizens were restricted. This study selected three standard air quality indexes AQI, PM2.5, and PM10 of 2017-2021 in 40 major cities of seven regions in China to analyze their changes, spatial-temporal distributions, and socio-economic influencing factors. Compared with 2019, AQI, PM2.5, and PM10 decreased by 22.54%, 13.94%, and 22.30%, respectively, and the days with AQI level "A" increased from 89% to 100% during the "lockdown" in 2020. Due to different degrees of industrialization, the decline range of Northeast, Yangtze River Delta, and Pearl River Delta areas is more than that of the Southwest, BTH, Northwest, and Central areas, the concentration of air pollutants shows significant regional characteristics. The AQI before and after the "lockdown" in 2020 showed significant spatial autocorrelation, and the cities' AQI in the north present high aggregation, and the cities in the south are in low aggregation. From the data at the national level, the changes of the four socio-economic factors of roadway passenger volume (RPV), construction area (CA), coal-fired power (CP), and the proportion of industrial added value in GDP (IND) significantly influenced AQI. This study gives regulators confidence that if the government implements regionalized air quality improvement policies according to the characteristics of each region in China and reasonably plans socio-economic activities, it is expected to improve China's air quality sustainably.