bluuebunny/crossref_metadata_2025 huggingface dataset:
The Specifics of the Compilation of the Calculated Load Combinations in the Assessment of Seismic Resistance of Steel Supporting Structures of Nuclear Power Plant Equipment and Piping
Authors:   State enterprise State Scientific and Technical Center for Nuclear and Radiation safety, Shugaylo Oleksandr P. , Bilyk Serhii I. ,   Kyiv National University of Construction and Architecture
Published: November 2022

The seismic resistance of nuclear power plant equipment and piping is determined, inter alia, by the seismic resistance of their steel supporting structures. During the operation of the nuclear power plant power unit, mechanical loads from the elements installed on them are transferred to the steel supporting structures of the equipment and piping. During an earthquake, seismic loads are added to these loads. By state building codes, when considering steel structures in special operating conditions (in particular, exposed to seismic hazards), it is necessary to comply with additional requirements that reflect the features of these structures. Given this, the issue of developing approaches to the compilation of load combinations in assessing the seismic resistance of steel supporting structures of nuclear power plants equipment and piping is acute, taking into account the specific conditions of their operation. The paper is also relevant as it is one of the priority areas of science and technology under the legislation of Ukraine. The development of approaches to the compilation of the calculated load combinations will contribute to the improvement and development of methods for assessing the safety of nuclear power facilities. The paper presents the results of the review of the provisions of state building codes on the calculated combinations of loads when assessing the strength of steel structures. Approaches to the compilation of the calculated load combinations in assessing seismic resistance of steel supporting structures power units of nuclear power plants equipment and piping taking into account the specific conditions of their operation have been developed.
The Optimal Correcting the Power Value of a Nuclear Power Plant Power Unit Reactor in the Event of Equipment Failures
Authors:   A. Pidhornyi Institute of Mechanical Engineering Problems of NASU, Kostikov Andrii O. , Zevin Leonid I. ,   A. Pidhornyi Institute of Mechanical Engineering Problems of NASU, Krol Hennadii H. ,   A. Pidhornyi Institute of Mechanical Engineering Problems of NASU, Vorontsova Anna L. ,   A. Pidhornyi Institute of Mechanical Engineering Problems of NASU
Published: November 2022

The paper considers the problem of adjusting the power of a nuclear power plant power unit reactor for those cases when equipment failure occurs. In such circumstances, sometimes it is sufficient to reduce the reactor power, while maintaining the probabilistic level of safe operation of the power unit. The rational number of the reactor power is determined by solving the problem of minimizing the risk criterion in the integral root mean square context. In order to demonstrate the efficiency of the proposed approach, a numerical example is considered. The approach outlined in the paper is focused on improving the power unit control in case of equipment failures.
Al-Haqaiq al-Ijtima'iyyah al-Andalus fi Syi'r Madh wa Tahniah li Ibn Zaydun
Authors: Haque Arina , Firdausi Muhammad Anwar , Zawawi Muhammad , Maimunah Iffat
Published: November 2022

PurposeThis study aimed to describe the influence of race, environment, and era in Andalusian society on Ibn Zaidun's hymn (praise) and tahniah (congratulations) poetry using the perspective of Hippolite Adolf Taine. MethodThis study was a qualitative research using a library research design that relied on the hymn and tahniah poetry in Diwan Ibn Zaidun: Rasailuhu, Akhbaruhu, Syi'rul Mikjain written by Kamil Kailani and Abdurrahman. This study analyzed the tradition of praise (madah) and congratulations (tahniah) of the Andalusian community in 19 of Ibn Zaydun's poems communicated with 3 indicators of Taine's theory of social facts, namely race, climate, and time factors. Results/FindingsThis study revealed the influence of the three aspects of Andalusian social facts on Ibn Zaidun's poetry, namely: 1) Ras-Spirit, showing that Andalusian society has the tradition of writing poetry for leaders; 2) Environment-Milieau, that was cool climate surrounded by beautiful green plants have a strong influence on Andalusian Literature, giving rise to many expressions of natural beauty in their poems, especially in praise (madah) and congratulations (tahniah) on Ibn Zaidun's poetry; 3) The Age of Moments privileging Andalusian with many muwashahat, so that the poets paid great attention to rhyme (qafiyah) in their poetry, and the uses of the Andalusian language with Arabic writing became greater in a number of poems. ConclusionAndalusian poetry represented by the poet Ibn Zaydun contains three aspects of Tain social facts. Ibn Zaydun's poetry tradition is influenced by the characteristics of Andalusian society, the climate in the Andalusian city, and the time of writing the poem. The author suggests further studies on the Hypolite Taine social fact theory with its unique scope of social facts. Likewise with Andalusian studies, further studies are urgently needed to find the meaning and social facts behind his classical poems.
Islam and Communist Power Relation in Najib Al-Kailani’s ‘Adzra Jakarta
Authors: Amsariah Siti
Published: November 2022

PurposeThis study examined the battle of the arena of power between Islam and communism that occurred in the dark events in Indonesia in 1965 through the Najib al-Kailani novel’ 'Adzra Jakarta. MethodThis qualitative research applied a narrative case study design made uses of Najib al-Kailani novel’ 'Adzra Jakarta as the main unit of analysis. To analyzed the data, the study used Pierre Bordieu’s concept of power relations to dismantle the arena fight between Islam and communism in Indonesian history through the capital ownership of figures. Results/FindingsThe results showed a lame power relationship between Islam and communists. Islam in 'Adzra Jakarta is described as inferior because it has only two capitals, while communist ideology holds symbolic capital which includes the other three capitals; Cultural, social and economic capital. However, if you look further at the defeat of Az Zaim by the main character, Fatimah, and his death at the end of the story are symbols of the text's partiality to Islamic ideology. ConclusionThe study concluded that the novel 'Adzra Jakarta reaffirms the perception of the latent danger of the communist ideology constructed by the Indonesian government. Through the main female character, the novel also supports women movement emerged in Egypt.
Word Formation of the Indonesian Covid-19 Special Terms
Authors: Budiono Taat , Mubarok Yasir
Published: November 2022

PurposeThis study was intended to describe the process of forming the Covid-19 outbreak-related special terms in Indonesian sourcing from English. MethodThe research employed a qualitative approach which a descriptive case study design. Its primary data consisted of words and phrases associated with Covid-19 taken from news articles on the Kompas.com page during March-July 2020 using a note-taking technique. The data were then analyzed qualitatively by considering the concepts of word formation in Indonesian. Results/FindingsTh research revealed that the forming of the Covid-19 related special terms were through absorption (49%), translation (32%), and through the creation of new concepts (19%). This indicates that the absorption of English terms into Indonesian was the most dominant process. English a global language was widely absorbed by other languages, including Indonesian. ConclusionThe research shows that Covid-19 outbreak-related special terms was classified into English terms and Indonesian terms. The terms experienced three formation processes, namely the absorption, translation, and the creation of new concepts
A Study on the Estimator Distribution for the Expected Value of a Compound Periodic Poisson Process with Power Function Trend
Authors: Safitri Nurul Indah , Mangku I Wayan , Sumarno Hadi
Published: November 2022

This article discusses the estimation for the expected value, also called the mean function, of a compound periodic Poisson process with a power function trend. The aims of our study are, first, to modify the existing estimator to produce a new estimator that is normally distributed, and, second, to determine the smallest observation interval size such that our proposed estimator is still normally distributed. Basically, we formulate the estimator using the moment method. We use Monte Carlo simulation to check the distribution of our new estimator. The result shows that a new estimator for the expected value of a compound periodic Poisson process with a power function trend is normally distributed and the simulation result shows that the distribution of the new estimator is already normally distributed at the length of 100 observation interval for a period of 1 unit. This interval is the smallest size of the observation interval. The Anderson-Darling test shows that when the period is getting larger, the p-value is also getting bigger. Therefore, the larger period requires a wider observation interval to ensure that the estimator still has a normal distribution.Keywords: moment method; normal distribution; Poisson process; the smallest observation interval. AbstrakPada artikel ini dibahas tentang pendugaan fungsi nilai harapan Proses Poisson periodik majemuk dengan tren fungsi pangkat. Tujuan penelitian kami adalah, pertama, memodifikasi penduga yang telah ada untuk menghasilkan penduga baru yang memiliki distribusi normal. Kedua, menentukan ukuran interval pengamatan terkecil sehingga penduga yang diusulkan masih berdistribusi normal. Pada dasarnya, penduga yang kami usulkan diformulasi menggunakan metode momen. Kami menggunakan metode simulasi Monte Carlo untuk memeriksa sebaran distribusinya. Hasil menunjukkan bahwa penduga yang baru untuk fungsi nilai harapan Proses Poisson periodik majemuk dengan tren fungsi pangkat memiliki distribusi normal. Hasil simulasi menunjukkan bahwa penduga baru telah berdistribusi normal pada panjang interval pengamatan 100 untuk periode sebesar 1 satuan. Interval pengamatan ini merupakan ukuran interval pengamatan terkecil. Selain itu, hasil uji Anderson-Darling menunjukkan bahwa ketika periode semakin besar maka p-value juga semakin besar. Oleh karena itu, periode yang lebih besar memerlukan interval pengamatan yang lebih panjang untuk menjamin penduga yang kami usulkan tetap berdistribusi normal.Kata Kunci: metode momen; distribusi normal; proses Poisson; interval pengamatan terkecil. 2020MSC: 62E17
Optimization of cross-section dimensions of structural members made of cold-formed profiles using compromise search
Authors: Yurchenko Vitalina , Peleshko Ivan
Published: November 2022

The object of this study is a structural member made from a C-shaped cold-formed profile, investigated to search for optimal cross-sectional dimensions. The parametric optimization task is stated as the problem to find the optimal cross-sectional dimensions of the structural member under axial compression conditions, taking into account its post-buckling behavior (local buckling of the web and flanges, as well as a distortional buckling of the cross-section) and structural requirements. In this case, the material consumption and mechanical characteristics of steel, as well as the design lengths of the structural member, were considered constant and predefined. The considered criterion of optimality was the maximization of the load-carrying capacity of the structural member for the overall buckling under the axial compression. The stated optimization problem is solved using the method of exhaustive search while applying the developed software. Additionally, for fixed steel consumption, compromise solutions were searched that do not depend on the thickness of the profile and the design lengths of the structural member. The resulting cold-formed C-shaped profiles with optimal cross-sectional dimensions are characterized by a higher load-carrying capacity for the overall buckling under axial compression (to 24.45 % and 22.19 %) at the same steel consumption compared to the profiles offered by the manufacturer. Analysis of the reported results made it possible to devise recommendations for optimal ratios of dimensions and geometric characteristics of the structural members made from C-shaped profiles operating under axial compression. The ratios could be used both at the stage of selection of cross-sections of structural members from cold-formed profiles, and in the development of effective assortments of cold-formed profiles
Development of tin copper alloys in shell and tube evaporator heat exchanger systems in ocean thermal energy converse power plant
Authors: Mawardi Mawardi , Wirjosentono Basuki , Ambarita Himsar , Koto Jaswar
Published: November 2022

A case study of the manufacture of an OTEC factory on a floating ship has been carried out using 100 MW Titanium material at a fairly expensive cost, so the OTEC system was researched using a copper-tin alloy. The behavior of the tin-copper heat exchanger between the Aspen Plus simulation and the Computational Fluid Dynamics (CFD) simulation on Shell And Tube evaporators of Bonnet Divided Flow fixed and Bonnet One-pass Shell fixed (BEM) types is investigated. The difference in temperature between water at sea level of 29 °C and water at a depth of 1000 meters at a temperature of 5 °C is assumed to produce electricity. A marine thermal energy conversion power plant is a continuous source of energy sourced from nature an evaporator heat exchanger with ammonia working fluid will produce power that can drive a turbine forwarded to a generator. The simulation results of CFD of a Bonnet Divided Flow fixed type Heat Exchanger on the hot water inlet line has a temperature of 29.9 °C, when exiting the evaporator shell the temperature decreases to 26.4 °C. At the inlet line, the working fluid of ammonia enters the evaporator at 7.9 °C and when it leaves the tube, the temperature rises to 26.3 °C. The best results of the simulation of Aspen Plus Heat Exchanger type BEM Inlet Ammonia temperature 8 °C and at CFD 7.99 °C. Meanwhile, at the ammonia outlet at 28 °C and in the CFD simulation, the ammonia outlet temperature was 28.21 °C. Aspen Plus Inlet heating water temperature is 30 °C, and in CFD simulation, the temperature is 29.99 °C. While the heating water outlet is 28 °C, and in the CFD simulation, the heating water outlet is 28.15 °C. The conclusion from the simulation results is that the BEM-type heat exchanger is very good and suitable for experimental prototyping.
Identifying some regularities of radio frequency propagation of a radar system by analyzing different environmental effects
Authors: Hamza Ekhlas Kadhum , Aziez Sameir A. , Reja Ahmed Hameed , Sabry Ahmad H.
Published: November 2022

Free space path loss is a function of frequency and propagation distance and the RF signal propagates at light speed in all directions in free space. The performance evaluation of wireless and radar communication technologies is related to understanding the propagation environments. This work presents the modeling of several RF propagation properties that include atmospheric attenuation due to rain, free space path loss, gas, and fog, as well as multipath propagations caused by ground bounces. The methodology discusses the developed model according to the series of (ITU) International Telecommunication Union references to radio wave propagation. This work discusses the Free Space Path Losses (FSPL), and Propagation Losses (PL) due to the atmosphere, precipitation, snow, rain, clouds, fog, atmospheric lensing and absorption, and polarization mismatch. The work also discusses the vertical coverage diagram and radar propagation factor. The obtained results demonstrate that the PL increases with frequency and range, at a 90-degree roll angle, the attenuation approaches infinity, and as the altitude rises, the amount of attenuation caused by lensing decreases. The analysis of attenuation at 1 km vs. frequency variations, at roughly 60 GHz, indicated a high absorption owing to air gas. Lensing attenuations are also offered as secondary outputs for convenience, the wideband channels present higher performance crossways and a wide range of target height as expected. When the target height increases, the influence of multi-path fading approximately vanishes entirely due to the variation increasing in the spreading delay between the bounce and direct pathway signals. This will reduce the coherence sum between these two samples on receiving by the target
Development and creation of a hydrodynamic liquid heating unit
Authors: Nussupbekov Bekbolat , Oshanov Yerlan , Ovcharov Michael , Mussenova Elmira , Ospanova Didar , Bolatbekova Madina
Published: November 2022

The work is devoted to the study of the parameters of an installation for heating a coolant using liquid forcing through throttle openings. A scheme of a full-size experimental stand has been developed and the principles of operation are described in detail. For visual observation of the state of the liquid at different angular speeds of rotation of the rotor, a transparent drum model is made. The influence of the shape of the rotor skirt and the depth of its immersion in the liquid on the filling capacity of the rotor cavity at an angular velocity from 42 to 314 rad/s has been determined. The optimal parameters of the depth of immersion of the drum skirt with a diameter of 0.5 m in the liquid, at low rotor speeds of 16, 24, 32 rad/s, were obtained. The angle of inclination is calculated and it is experimentally proved that for a conical shape it is 5 degrees. It was found that at angular velocities of the rotor more than 100 rad/s, the shape and depth of immersion of the skirt in the liquid do not affect the filling of the rotor, since the feed is higher than its flow through the throttle openings. It is shown that the use of rotational forces to heat the liquid allows using an electric motor with less power, since it is spent only on unwinding the rotor with the liquid. The calculated dependence of the liquid pressure on the side walls of the rotor, the liquid heating temperature on the angular velocity of rotation of the rotor and on two values of the area of the throttle openings, at 31.4·10-6 m2 and 64.34·10-6 m2, is obtained. When the total area of the throttle openings is doubled, the temperature of the liquid heating at the same angular velocities increases from 35.6 °C to 82.5 °C. The above installation parameters allow you to get hot water when using small shell-and-tube heat exchangers
Explication of the role of digital technologies in marketing management of a modern company
Authors: Dunayev Igor , Hromov Serhii , Tymchenko Yuliia , Proskurina Maria
Published: November 2022

This study considers the use of digitalization technologies in the management of marketing of a commercial company. As a result, the problem of bringing empirical knowledge about the importance of digitalization technologies in the company's marketing management to a theoretical model has been solved. Digitalization technologies for implementation in marketing activities were selected and the decomposition of marketing management in a commercial company was performed. On this basis, a theoretical model for assessing the impact of digitalization technologies on the marketing management of a commercial company has been developed. The results of an empirical study based on the developed theoretical model proved the truth of the hypothesis about the positive impact of the spread of the use of digitalization technologies on the marketing management components of commercial companies. The choice of specific digitalization technologies is explained by the essence of marketing as a management activity. Structural decomposition of the marketing management process is explained by traditional management functions and clarifies the criteria for choosing technologies. The results of calculations according to the formed theoretical model are explained by the development of the platform economy and ecosystems, which involve the studied big data technologies, cloud computing and social media, as well as blockchain. The methodical approach to substantiating the role of digitalization technologies proposed in this study is characterized by the use of fundamental provisions on cybernetic systems, management theory, and modern marketing concepts. The obtained results make it possible to find out the presence and direction of the effects of the spread of the use of digitalization technologies in the company's marketing management and make informed decisions about the business digitalization strategy
Determining the static characteristic of a measuring current transformer at a reduced load of the metering unit
Authors: Vasylets Kateryna , Kvasnikov Volodymyr , Vasylets Sviatoslav
Published: November 2022

The object of the research is a measuring current transformer of the electromagnetic type, which is used as part of the electricity metering unit. The current transformers functioning in the mode of reduced primary current is accompanied by significant errors. The existence of such a regime for a long time due to downtime of production equipment leads to a significant underestimation of electricity. This leads to unjustified financial losses for energy supply companies as electricity in many countries has become more expensive. The static characteristic of the measuring current transformer at a reduced load of the metering unit is described by a linear statistical model. The parameters of the model are estimated on the basis of empirical data using methods of covariance analysis. The adequacy of the model is confirmed by analysis of regression residuals. The obtained statistical model of the static characteristic, unlike the known ones, is characterized by universality, as it describes current transformers with an arbitrary transformation ratio within the studied accuracy class of 0.5S. The uncertainty of the current error is estimated using the prediction intervals for the transformers secondary currents as a function of the primary currents, calculated on the basis of the obtained model. The prediction intervals for sample values of the current error were obtained through the application of the proposed approach for uncertainty estimation of such an error at a reduced load of the metering unit. It was found that the current error can reach −20 %. Taking into account the indicated intervals for measuring current transformers at a reduced load of the metering unit during billing will allow energy supply companies to increase the accuracy of commercial electricity metering.
Unraveling the study of liquid smoke from rice husks as a green corrosion inhibitor in mild steel under 1 M HCl
Authors: Kaban Agus , Mayangsari Wahyu , Anwar Mochammad , Maksum Ahmad , Aditiyawarman Taufik , Soedarsono Johny , Ridhova Aga , Riastuti Rini
Published: November 2022

The work provides the more comprehensive development of Liquid Smoke from Rice Husks Ash (RHA). Notably, the study focuses on the interaction between the primary molecules of inhibitor and mild steel, including thermodynamic calculation and surface treatment upon addition of inhibitor. The electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PP) characterization were utilized to evaluate the anticorrosion of RHA. The Raman Spectroscopy pre and post-addition of RHA’s inhibitor were used to compare the adsorbed functional group of inhibitors. Moreover, the thermodynamic calculation of the inhibitor’s adsorption determines the types of adsorption of the inhibitor. As a result of the adsorption process, the Scanning Electronic Microscope-Energy Dispersive X-Ray (SEM-EDX) aided by The Atomic Force Microscopy (AFM) and Contact Angle Test was implemented to unveil the surface treatment and the change of elemental composition after the addition of an 80 ppm inhibitor. The PP and EIS results show a significant depression of the current density at ‒2.75 μA·cm2 in 80 ppm solution with the highest inhibition efficiency of 99.82 %. The superior inhibition correlates to the adsorption of Si–OH, C–C, C–O–C, >C=O, complex structure, and –OH at wavenumber 458, 662, 1095, 1780, and 3530 cm-1. The LS shows a significant surface area of protection of 0.9982 and high adsorption constant (Kads) at 11.648. The calculated ΔGads of ‒6.59 kJ/mol unveils the chemisorption in nature. At the same time, a combination of 20 and 80 ppm solution is predicted adsorbed horizontally to reduce the contact between the solution and substrate, as shown in SEM and AFM results. It also increases the contact angle and their corresponding hydrophobicity
Development of rational technology for sodium glyceroxide obtaining
Authors: Korchak Mykola , Bliznjuk Olga , Nekrasov Serhii , Gavrish Tatiana , Petrova Olena , Shevchuk Natalia , Strikha Liudmyla , Kostyrkin Oleg , Semenov Evgeny , Saveliev Dmytro
Published: November 2022

The process of sodium glyceroxide obtaining by the reaction of glycerol and sodium hydroxide in the form of an aqueous solution was investigated.
Glycerol salts (metal glyceroxides) are important components in the synthesis of many compounds. Glyceroxides are used in the chemical industry, construction, medical practice, etc. Glyceroxides of alkali metals are used in the production of modified fats and biodiesel fuel.
P.a.-grade glycerol (CAS Number 56-81-5) was used with a mass fraction of the main substance of 99.5 %. The parameters of sodium hydroxide (CAS Number 1310-73-2) were studied: the mass fraction of the main substance is 98.0 %, the mass fraction of sodium carbonate is 0.5%.
Rational conditions for sodium glyceroxide obtaining were determined: temperature (145 °C) and concentration of sodium hydroxide solution (65 %). Under these conditions, the mass fraction of the main substance in the product was 80 %. The melting point (72 °C) and mass fraction of moisture (0.3 %) in sodium glyceroxide were determined. The catalytic activity of the product in the process of transesterification of palm olein was tested. The increase in the melting point of palm olein was 15 °C. Under similar conditions of using potassium glyceroxide with a mass fraction of the main substance of 75.77 %, the increase in the melting point is 12.1 °C. This indicates an increase in the efficiency of the transesterification process using sodium glyceroxide obtained by the developed technology.
The research results make it possible to produce sodium glyceroxide under rational conditions with a high mass fraction of the main substance at enterprises that use metal glyceroxides as a production component or commercial product. The determined rational conditions will make it possible to effectively use the company's resources and predict the quality of the final product
Application of paper mill sludge and additional chemical substances in the production of container cardboard
Authors: Halysh Vita , Trus Inna , Radovenchyk Iaroslav , Shabliy Tetyana , Ivanchenko Anna , Nikolaichuk Alina , Gomelya Nikolai
Published: November 2022

The possibility to dispose of paper mill sludge as part of a composition of container cardboard from secondary raw materials has been investigated. The fractional composition of the sludge was studied and it was shown that the main part of the fibers is represented by small particles with a size of up to 1.2 mm. Studying the processes of formation of container cardboard when using paper mill sludge showed that an increase in the consumption of fibrous-inorganic waste leads to a deterioration in the physical and mechanical properties of cardboard. However, the increase in sludge consumption does not affect the surface absorption of water during one-sided wetting. The value of these indicators is within the normal range and is 25 and 70 g/m2, respectively. In addition, an increase in sludge consumption from 10 to 50 % in the manufacture of cardboard leads to a decrease in the degree of fiber retention on the grid from 86.3 to 82.1 %. Regularities of using strengthening additives, namely industrial cationic and anionic flocculants, as well as native corn and modified starches for the strength of cardboard and the quality of sub-grid waters, have been established. Research results show that the effect of flocculants is quite ambiguous. On the one hand, there is a clearly observed positive impact on the quality of the sub-grid waters. This is due to the reduction of their turbidity due to smaller fiber washes. Nevertheless, the positive effect on physical and mechanical parameters is minimal, and in some cases, there is a decrease in strength indicators. The greater the efficiency of keeping fine fiber on the grid when using flocculants, the lower the values of physical and mechanical indicators. In general, when using sludge in the composition of cardboard in combination with flocculants and starch, the indicators were achieved that are considered standard for waste paper container cardboard of grade KT-1 according to TU U 17.1-41085075-002:2017
Influence of substitution of wheat flour with modified potato starch on the quality of Chinese steamed bread
Authors: Deng Chunli , Melnyk Oksana , Luo Yanghe
Published: November 2022

The application of potato starch in flour products is very important for potato staple food. The gluten protein of wheat flour will be weakened after being mixed with potato starch, which could have inhibitory effect on quality properties of flour products. Therefore, it is, it is necessary to study the influence of substitution wheat flour with potato starch on the quality of Chinese steamed bread (CSB), which is an important staple food in North China.
This study investigated the effect of potato starch modified by heat-moisture treatment (HMTS) and microwave treatment (MWS) as wheat flour substitute in the making of CSB. The research results showed that the specific volume of CSB decreased with more incorporation of HMTS or MWS. The differences color (ΔE>3) between the control and experimental CSB were detectable by the human eye when the substitution level of HMTS or MWS was higher than 30 % or 20 %, respectively. Texture properties of CSB were affected with substitution due to the disruption of dough structure, and the incorporation of HMTS or MWS led to firmer and denser structure of CSB. The total sensory score of CSB decreased with more incorporation of HMTS or MWS. CSB can be accepted by consumers when the substitution level of wheat flour with HMTS or MWS was lower than 30 %. In general, the research results revealed that modified potato starch (HMTS and MWS) incorporation levels affected the specific volume, color, texture properties and sensory evaluation of CSB. This research can provide comprehension of the influence of modified potato starch (HMTS or MWS) on CSB and provide valuable guidance for further application of potato starch in wheat-based products
Development of a fake news detection tool for Vietnamese based on deep learning techniques
Authors: Vo Trung Hung , Phan Thi Le Thuyen , Ninh Khanh Chi
Published: November 2022

With the development of the Internet, social networks and different communication channels, people can get information quickly and easily. However, in addition to real and useful news, we also receive false and unreal information. The problem of fake news has become a difficult and unresolved issue. For languages with few users, such as Vietnamese, the research on fake news detection is still very limited and has not received much attention.
In this paper, we present research results on building a tool to support fake news detection for Vietnamese. Our idea is to apply text classification techniques to fake news detection. We have built a database of 4 groups of 2 topics about politics (fake news and real news) and about Covid-19 (fake news and real news). Then use deep learning techniques CNN (Convolutional Neural Network) and RNN (Recurrent Neural Network) to create the corresponding models. When there is new news that needs to be verified, we just need to apply the classification to see which of the four groups they label into to decide whether it is fake news or not. The tool was able to detect fake news quickly and easily with a correct rate of about 85 %. This result will be improved when getting a larger training data set and adjusting the parameters for the machine learning model. These results make an important contribution to the research on detecting fake news for Vietnamese and can be applied to other languages. In the future, besides using classification techniques (based on content analysis), we can combine many other methods such as checking the source, verifying the author's information, checking the distribution process to improve the quality of fake news detection.
Determining the thermoplastic deformation mechanism of titanium reduction reactors and recommendations to increase the reactor service life
Authors: Mishchenko Valeriy , Loskutov Stephan , Kripak Alona
Published: November 2022

The object of research reported in this paper is the stressed-strained state of reactors when producing titanium sponge by the magnesium thermal method, taking into consideration the conditions of their operation and the physical and mechanical properties of the materials.
The problem considered is the plastic deformation of the reactor in the process of reducing titanium tetrachloride. To solve this task, an axisymmetric geometric model of the reactor was built using a CAD module of the Comsol Multiphysics software package. For the calculation, the Nonlinear Structural Materials module was used. Owing to the method of finite elements, the critical parameters for the formation of the plastic deformation band of the reactor were determined.
Modeling the process of thermoplastic deformation of the reactor under the conditions of obtaining titanium sponge has made it possible to determine the temperature gradient in the upper part of the reactor wall, which leads to local plastic deformation of the wall. The solution to the problem of continuing the reactor service would be to prevent overheating (overcooling) of the reactor wall within the resulting temperature. The physical and mechanical parameters of the material of the reactor wall, necessary to prevent the occurrence of an annular band of plastic deformation, have also been determined. It was shown that at ∆T˃∆Tcrit=60 °C, the walls of a 10-ton reactor during the reduction of titanium tetrachloride with magnesium perceive plastic deformation whose maximum value can reach
Deformation mechanisms that lead to a change in the shape of the side wall of reactors of magnesium-thermal production of sponge titanium under the action of a heterogeneous temperature field have been determined. The proposed technological solutions are to eliminate local changes in diameter in the upper part of the reactor wall. This will make it possible not only to increase the life of the reactors but will reduce the flow of alloy components into the titanium sponge of nickel, chromium, and iron
Adaptation of risk management in the supply chains of e-commerce enterprises under the conditions of political instability
Authors: Kharsun Liudmila , Kavun-Moshkovska Olha , Kotova Maryna , Nechyporuk Alina
Published: November 2022

The research considers the construction of a supply chain management system for e-commerce enterprises in the face of political threats and the manifestation of the risks of military conflicts. In the system of political risks to the functioning of supply chains (SC) of e-commerce enterprises, the threats of military conflicts and civil confrontations are highlighted. It has been established that despite the indirect and relatively low sensitivity of e-commerce to political risks, there is a high probability of negative impact on the mechanism of functioning of supply chains of e-commerce enterprises of military conflicts. The characteristic directions of influence of the risks of military conflicts on the activities of e-commerce enterprises are revealed. Five groups of risks for the supply chain of an e-commerce enterprise caused by military conflicts have been identified: infrastructure, contractual, economic, financial, social, reputational. The consequences and directions of influence of factors of military-political instability on the functional areas of logistics of the supply chain of e-commerce enterprises are determined. The ranking was carried out using the expert method of risks of military conflicts for supply chains of e-commerce enterprises. It was established that in 1st place with an importance coefficient of 0.18 there is a risk of deterioration of information relations. It was estimated that the average period for the restoration of supply chains since the beginning of hostilities is 2–3 months. The study schematically depicts the cyclical causality of the functioning of the supply chain of an e-commerce enterprise in the face of aggravation of military-political conflicts. An algorithm for the construction of a risk management system for e-commerce enterprises has been developed
Developing a model of smart home usage among it specialists: the role of machine learning
Authors: Sharef Baraa
Published: November 2022

Models of smart home usage dominate in developed countries, while in developing countries, they are still lacking. Technology Acceptance Model (TAM) is widely used in the context of smart home, and few studies examined other technology acceptance theories. The purpose of this study is to examine the experience of using smart home by Information Technology (IT) specialists in the Gulf Cooperation Council (GCC). The study deploys existence theories and proposes that the effect of relative advantage, convenience, accessibility, and cost on the intention to use smart home is positive. In addition, it was suggested that intention to use, as well as facilitating condition, directly affects the actual use of smart home. The knowledge of machine learning was proposed as a moderator between intention to use and actual use. The data were collected from IT specialists in the GCC using purposive sampling. The analysis was conducted using the Analysis of moment structures (AMOS). The findings showed that convenience, accessibility, and relative advantage have a positive effect, while cost has a negative effect on the intention to use smart home. The intention to use and facilitating condition affected positively the actual use. Knowledge in machine learning moderated positively the effect of intention to use on actual use. Decision makers are recommended to enhance the benefits of using the Internet of Things smart home and create a customized plan to enable using smart home at all levels. The knowledge of machine learning is critical for smart home usage, and customized courses in this regard are critical to boost the usage of smart home.
Using modern concepts in the design of extrusion dies to improve the mechanical extrusion and fatigue properties for AA1100
Authors: Al-Mushehdany Abdulwahab M. , Yahya Mazin Mahmood , Hmood Batool Kadhim , Alalkawi Hussain Jasim M.
Published: November 2022

In this research work a direct extrusion unit has been designed and manufactured for circular section using the theoretical die design concepts for designing of the die profile, as constancy of the ratio of successive generalized homogeneous strain increment (CRHS). This was carried out by studying the final mechanical properties of the direct extruded products through dies with theoretical concept (ACRHS) and (UCRHS). Commercial alloy AA1100 round section billets was subjected to uniform extruded compressive load using two types of extrusion dies i.e. (ACRHS) and (UCRHS) at room temperature. The product of these dies with as received were conducted to testing under tensile and fatigue tests without corrosion and with corrosion of 90 days fully submersed in 0.35 % NaСl solution. The experimental results show that the reduction percentage (RP) in the main mechanical properties, UTS, YS and BHN due to corrosion were 14.28 %, 5.88 % and 12.12 % for as received samples, 2.74 %, 5.08 % and 6.12 % for the ACRHS samples and 7.79 %, 6.86 % and 8.88 % for UCRHS samples respectively. It was concluded that the less reduction percentage was occurred in the ACRHS samples compared to other samples. Corrosion fatigue testing of the above three samples were made and compared to the same samples without corrosion. The testing results revealed that the corrosion is significantly reduce the fatigue strength at 107 cycles from 40 to 33.65 MPa for as received samples, from 49.47 to 46.73 for ACRHS samples and from 49.5 to 45.89 MPa for UCRHS samples. The results may be lead to the best mechanical and fatigue properties under corrosion action are the ACRHS samples. The obtained results show that the extrusion die (ACRHS) is the most efficient die design
Design and kinematic investigation of an actuated prosthetic ankle during walking
Authors: Hameed Mohammed Ismael , Ali Ahmed Abdul Hussein , Saleh Mohammed S.
Published: November 2022

Due to the varied needs of persons who have lost a lower limb in their everyday lives, ankle-foot prosthetic technology is continually evolving. Numerous prosthetic ankles have been created in recent years to restore the ankle function of lower limb amputees. Most ankle foot prostheses, on the other hand, are passive, such as the solid ankle cushion heel and the energy storage and release foot (ESAR). The solid ankle foot can only provide steady vertical support during ambulation; however, the ESAR foot can store energy and gradually release it throughout human walking periods, hence increasing the walking pace of amputees. The aim of this work is to describe the design and manufacture of an actuated ankle-foot prosthesis. The main benefit of powered ankles is that they are capable of mimicking natural stride, particularly in steep or uneven terrain conditions. The primary objective is to establish two degrees of freedom of ankle rotation in two planes, plantar flexion and dorsiflexion in the sagittal plane, besides inversion and eversion in the frontal plane. As software can improve the gait stability, an automatic modifiable transmission arrangement was prepared for delivering the current design motions in the sagittal plane based on empirical collected biomechanical data related to passive prosthetic normal gait circumstances. However, the ankle rolling in the frontal plane was guided mechanically by means of mono leaf spring. The majority of the ankle mechanical components are made of 7075-T6 aluminum alloy and are integrated onto ESAR carbon fiber laminated foot. For a unilateral above-knee amputee, the ankle function at self-selected walking was assessed, achieving maximum results of 10° inversion, 10° eversion, 12° plantar flexion and 18° dorsiflexion ankle angles. Also, the patient gait experiment in a normal cadence showed an improvement in plantar flexion behavior for the powered ankle in contrast with the passive ankle
Calculation-experimental procedure for determining welding deformations and stresses based on a digital image correlation method
Authors: Korzhyk Volodymyr , Khaskin Vladyslav , Savitsky Viktor , Klochkov Illia , Kvasnytskyi Viktor , Perepichay Andrii , Peleshenko Sviatoslav , Grinyuk Andriy , Aloshyn Andrii , Shutkevych Oleksii
Published: November 2022

The object of this study is determining the stressed-strained state (SSS) of a welded article by applying quantitative non-destructive testing. The relevance of the study is associated with the need to devise a universal methodology for the non-destructive quantification of SSS using the simplest approaches and means of provision. To solve this task, an estimation-experimental procedure has been developed. This procedure is based on comparing digital stereo images of the individual sections (spatial primitives) of an article before and after its welding, followed by computer processing. To validate the developed procedure, the SSS of a cylindrical article made of aluminum alloy 7005, at the end of which two flanges were welded laserly with ring seams, was determined. It was established that after performing four diametrically opposed point tacks, the residual deformations of the ends of the article can reach 0.02–0.05 mm, and after performing continuous ring seams – to decrease to 0.01–0.02 mm. The calculation showed that the residual deformations of the end of the article after welding a ring seam are at the level of 0.02 mm, and the residual stresses in the same zone – in the range of 50–60 MPa. The deviation in the coincidence of residual deformations is in the range of 10–20 %, which is a satisfactory result and can be considered as an error in the results of determining SSS in general. Based on the developed methodology for determining SSS, an experimental industrial complex has been created that allows TIG and PAW to perform welding of objects from steels and alloys with the ability to determine the resulting stressed-strained state of these objects. The procedure devised and the equipment designed can be used for to non-destructively determine SSS of spatial structures made of steels and alloys
Increasing the reliability of biomass solid fuel combustion using a combined regenerative heat exchanger as an indirect burner
Authors: Tunggul Ismail Alwinsyah , Ismail Ismail , Abdu Rahman Reza
Published: November 2022

In this study, an indirect burner system for solid biomass fuel is designed. The design is motivated by the need to solve the problem related to a direct burner system, such as slagging and high pollutant emissions due to the high-temperature burning process. Therefore, the utilization of an indirect burner is expected to improve the reliability of the solid biomass combustion process. It also can be used to reduce coal consumption by using an indirect burner where the working fluid reaches a relatively higher temperature before entering the boiler. The design used the first principle method for creating the regenerator heat exchanger. The regenerator consists of a mantle and coil heat exchanger. The test used solid biomass fuel for the combustion process where the working fluid first enters the mantle heat exchanger and then the coil heat exchanger. As a result, the mantle absorbs sufficient heat losses from the combustion chamber with the highest temperature increment of 19 °C. The warm water from the mantle then flows to the coil arrangement within the combustion chamber. As a result, the highest temperature of the coil is 84.5 °C. The heat transfer rate for the coil and mantle is 57.2–85.6 and 124.9–141.5 W. The key finding is that the combined regenerative heat exchanger can deliver a higher transfer rate. This can be achieved since the heat exchanger utilizes the same flow distribution, increasing the mean temperature differences at the inlet. Thus, it can produce an average heat transfer rate of 210.5 W. Therefore, energy consumption for coal or other fossil fuels can be reduced significantly. The data can be used for further improvement of the existing boiler system and help to increase the thermal efficiency of the system.