bluuebunny/crossref_metadata_2025 huggingface dataset:
An Anomaly Detection Approach to Determine Optimal Cutting Time in Cheese Formation
Authors: Loddo Andrea , Ghiani Davide , Perniciano Alessandra , Zedda Luca , Pes Barbara , Di Ruberto Cecilia
Published: April 2024

The production of cheese, a beloved culinary delight worldwide, faces challenges in maintaining consistent product quality and operational efficiency. One crucial stage in this process is determining the precise cutting time during curd formation, which significantly impacts the quality of the cheese. Misjudging this timing can lead to the production of inferior products, harming a company's reputation and revenue. Conventional methods often fall short of accurately assessing variations in coagulation conditions due to the inherent potential for human error. To address this issue, we propose an anomaly detection-based approach. In this approach, we treat the class representing curd formation as the anomaly to be identified. Our proposed solution involves utilizing a one-class, fully convolutional data description network, which we compared against several state-of-the-art methods to detect deviations from the standard coagulation patterns. Encouragingly, our results show F1 scores of up to 0.92, indicating the effectiveness of our approach.
Research on Effect of Psychological Emotions and Academic Performance on Music Learning System Based on Nonlinear Model System
Authors: Peng Lingxu , Fang Xiangkun , Guo Longchuan , Tian Cong
Published: April 2024

This research aims to explore factors that influence sustainable music learning system from psychological perspective, and innovatively constructs a combination of qualitative and quantitative approaches. For first time, combines nonlinear system and identifies relevant factors affecting music learning by establishing data system for questionnaire answering and a quantitative model for actual academic performance. Existing research mainly looks at several factors that affect fragmented music learning system from perspective of teachers' teaching rules, emphasizing phased teaching state and learning goals of teachers as main body, thus ignoring music learning students, who are a large group of music learning objects. The research fills gap in this type of research object, focusing on sustainable music learning system from emotional perspective and students who occupy a dominant position in music learning, so as to more accurately explore impact of their emotional influencing factors on music learning system. The most prominent innovation of this study lies in construction of stochastic nonlinear system for psychological influencing factors of student music learning and a quantitative model for actual learning effect. Through analysis of nonlinear system, weight values of several negative emotions on music learning system are obtained. The comprehensive impact of emotional factors and practical learning on music learning system can be obtained by weighting them together.
Investigating Effective Factors in Solving Partial Differential Equations using Deep Learning Techniques
Authors: Kabi-Nejad Parastoo
Published: April 2024

Partial Differential Equations (PDEs) constitute a fundamental framework for modeling various physical phenomena across diverse fields such as physics, engineering, and finance. Solving PDEs accurately and efficiently remains a significant challenge, particularly when dealing with complex systems or high-dimensional data. In this paper, we present a novel approach based on deep learning techniques to investigate the effective factors in solving PDEs. Our methodology leverages the expressive power of deep neural networks to learn and represent the underlying relationships between input parameters and the solutions of PDEs. By incorporating domain knowledge into the network architecture and training process, our approach aims to provide insights into the key factors influencing the solution of PDEs. We demonstrate the effectiveness of our method through numerical experiments on various PDEs, showcasing its capability to identify important features and improve predictive accuracy. Our findings suggest that deep learning techniques offer a promising avenue for understanding and analyzing the complex dynamics inherent in PDEs, paving the way for enhanced computational methods in scientific and engineering applications.
Nanostructured Biomaterials in Tumor Tissue Engineering: Regenerative Medicine and Immunotherapies
Authors: Angelopoulou Athina
Published: April 2024

The evaluation of nanostructured biomaterials and medicines is associated with 2D cultures that provide insight into the biological mechanisms at the molecular level, while critical aspects of the tumor microenvironment (TME) are provided by the study of animal xenograft models. More realistic models that can histologically reproduce human tumors are provided by tissue engineering methodologies of co-culturing cells of varied phenotypes, to provide 3D tumor spheroids that recapitulate the dynamic TME in 3D matrices. The novel approaches of 3D tumor models are combined with tumor tissue engineering (TTE) scaffolds including hydrogels, bioprinted materials, decellularized tissues, fibrous and nanostructured matrices. This review focuses on the use of nanostructured materials in cancer therapy and regeneration, and the development of realistic models for studying TME molecular and immune characteristics. Tissue regeneration is an important aspect of TTE scaffolds for restoring the normal function of the tissues, while providing cancer treatment. Thus, this article reports recent advancements on the development of 3D TTE models for antitumor drug screening, studying of tumor metastasis, and tissue regeneration. Also, this review identifies the great opportunities of 3D TTE scaffolds in the evaluation of the immunological mechanisms and processes involved in the application of immunotherapies.
Vertical Meaning: Interpersonal Data in Quantum Circuits via Japanese Honorifics
Authors: Walton Ryder Dale
Published: April 2024

This paper proposes a novel concept within Quantum Natural Language Processing (QNLP) to encode the interpersonal metafunction of Systemic Functional Linguistics (SFL), particularly tenor, into quantum circuits by treating Japanese honorifics seriously. Because of English language bias in the literature, the incorporation of nuanced aspects of interpersonal communication evident in languages, such as the aforesaid Japanese, remains under-developed and overlooked. Utilizing lambeq, monoidal categories, and string diagrams, this study extends lambeq’s quantum computing framework to capture not only grammar but also social context—specifically the roles and relationships that define interpersonal interactions in quantum circuits. This approach represents a significant step toward that end simply by defining the honorific type h in lambeq. This innovative strategy exposes the capability of quantum circuits to model the complex structures of language, moving beyond grammar and even semantics—the horizontal, textual dimension of language—to embrace the vertical, hierarchical dimension of human communication and social interaction. Through this lens, the paper underscores the potential of QNLP to transcend traditional linguistic analysis, advocating for a broader and more nuanced understanding of language that includes not only what is said but also the social persona of the interlocutors. An algorithm for parsing Japanese grammar into pregroup diagrams containing the h type is introduced along with a codebase for other researchers to use and to which to contribute. Lastly, a toy experiment is performed to demonstrate that the circuits generated from these pregroup diagrams are suitable for Quantum Machine Learning (QML) applications.
Design and Implementation of AI-Based Judicial Big Data Intelligent Service Platform
Authors: Sun Zhangsheng , Li Wenhao , Yu Mengru , Yang Xiaohan , Nurmaithi Muqayam
Published: April 2024

Based on big data and artificial intelligence technology, the judicial big data intelligent service platform provides users with efficient and accurate legal consulting services. It has many functions such as intelligent question and answer, case analysis, and law inquiry. It also analyzes the application value of the intelligent legal consulting service platform in the field of judicial big data. By building an intelligent service platform, the rapid processing and analysis of massive judicial data has been realized, and the efficiency and quality of judicial work have been significantly improved. In addition, it emphasizes the importance of data management and quality control in the application of judicial big data, and puts forward specific measures to strengthen data management and quality control. With the continuous advancement of technology and the expansion of application fields, the platform is expected to achieve deep integration with other legal services, expand new application fields, and provide users with more comprehensive and efficient legal services. At the same time, it points out the problems that need to be paid attention to in the future development, such as data security, privacy protection and so on. Through in-depth analysis and research on judicial big data, the platform can provide strong support for judicial decision-making and promote the improvement of judicial justice and efficiency.
Human Sputum Proteomics: Advancing Non-Invasive Diagnosis of Respiratory Diseases with Enhanced Biomarker Analysis Methods
Authors: Guzman Norberto A. , Guzman Andrea
Published: April 2024

Many ailments can be diagnosed while they are asymptomatic, meaning that the patient has no signs or symptoms of a progressing disease. If caught in their initial stage of formation, these maladies can be effectively treated, leading to successful outcomes; curative therapies can halt illnesses from advancing, thus improving the quality of life, and long-term survival of the patient. Still cutting-edge upgrades in precision technologies are necessary for early, reliable, affordable, and rapid disease detection, but also are vital for the well-being of people and the future of global public health. The emerging role and utility of non-invasive and repeatable diagnostic test approaches for detection of health conditions has been liquid biopsies based on genomic biomarkers. As such, biological fluids permit any measurable molecular indicator or signature (e.g., proteins), to provide valuable information on individual’s wellness and/or disease. Among the bodily secretions used for non-invasive diagnostics is sputum, a complex viscous gel-like biopolymeric network, that has gained growing recognition as a rich source of biomarkers of airway infections, pulmonary diseases, and serves as a determinant to reveal other illnesses. As per the World Health Organization, the burden of respiratory conditions is exacerbated by factors, ranging from considerable subjection to air pollution and occupational contaminants, to tobacco smoking and second-hand smoke, in addition to poor socio-economic status. Due to the likely increase of these determinants, respiratory tract ailments are on the rise, affecting the health of many individuals, in addition to putting stress on healthcare facilities and services worldwide. We therefore highlight the need to use expectorated or induced sputum specimens as a routine sample source for testing valuable protein biomarkers to diagnose these chronic maladies, to predict inflammation and disease progression, as well as monitor the effectiveness of treatments. Further, we discuss the urgency for fast and reliable point-of-care methods to detect and quantify crucial protein biomarkers in sputum specimens, and limitations faced when dealing with their complex matrices.
Genetic Gain and Inbreeding Rate in Different Simulated Genomic Selection Schemes for Grain Yield and Oil Content in Safflower
Authors: Zhao Huanhuan , Khansefid Majid , Lin Zibei , Hayden Matthew
Published: April 2024

Abstract Safflower (Carthamus tinctorius L.) is a multipurpose minor crop consumed by developed and developing nations around the world with a limited research fund and genetic resources. Genomic selection (GS) is an effective modern breeding tool which could help to fast track the genetic diversity preserved in genebank collections to facilitate rapid and efficient germplasm improvement and variety development. In the present study, we simulated four GS strategies to compare genetic gains and inbreeding rates during breeding cycles in a safflower recurrent selection breeding program targeting grain yield (GY) and seed oil content (OL). We observed positive genetic gains over cycles in all four GS strategies, where the first cycle delivered the largest genetic gain. Single traits GS strategies had the greatest gain for the target trait but with very limited genetic improvement for the other trait. Simultaneous selection for GY and OL via index indicated higher gains for both traits than crossing between the two single trait independent culling strategies. The the multi-trati GS strategy with inbreeding control (GS_GY+OL+Rel) showed lower inbreeding rate but similar gain compared to GS_GY+OL (without inbreeding control) after few cycles. Our finding lay the foundation for the future safflower GS breeding.
Integrated Approach to Addressing Flood Risk in Sri Lanka’s Deduru Oya Basin: Implications for Water-Food-Land-Energy Nexus
Authors: Wanninayake W.M Sisira B , Ünver Olcay , Nianthi K.W.G Rekha , Banda OG Dayaratne , Nissanka Thushantha S , Withanachchi Chandana R , Köpke Sören , Withanachahi Sisira S.
Published: April 2024

Sri Lanka's vulnerability to climate change-induced natural disasters, particularly floods, under-scores the urgent need for an integrated approach to disaster risk management (DRM) that ad-dresses the interconnected challenges within the water-food-land-energy nexus. The Deduru Oya basin, located in the north-western region, exemplifies this vulnerability, with its predominantly intermediate climatic zone susceptible to flooding. While the focus has traditionally been on flood risk reduction, it is imperative to recognize the broader implications of floods on water, food, land, and energy systems. This study aims to strengthen data acquisition and management efforts to better understand rainfall trends and their impact on the water-food-land-energy nexus in the Deduru Oya basin. By compiling 60 years of rainfall data and conducting time series analysis, we observed a decreasing trend in monthly rainfall, particularly during the South-West Monsoon, Second Inter Monsoon, and North-East Monsoon seasons. These findings have significant implica-tions for water availability, agricultural productivity, land use patterns, and energy generation in the basin. Moreover, the malfunction of stakeholders' responsibilities for local-level flood risk management exacerbates the challenges faced by communities living in flood-prone areas. By in-tegrating insights from this study into flood risk management strategies, stakeholders can develop holistic approaches that not only mitigate flood risk but also enhance resilience across the water-food-land-energy nexus. This interdisciplinary approach will inform policymakers, flood manag-ers, practitioners, and the community in formulating effective strategies to address the multifacet-ed challenges posed by floods in the Deduru Oya basin and beyond.
Understanding Preferences of Indian Three-Wheeler Drivers for Electric Vehicles
Authors: Zhou Zijin , Shao Lingfang
Published: April 2024

In India, where the transport sector contributes significantly to CO2 emissions, there has been a growing shift towards electric vehicles (EVs), particularly in the three-wheeler segment. Traditional auto-rickshaws, a staple in urban transportation, are often powered by internal combustion engines, leading to pollution and high fuel consumption. Electric three-wheelers, or e-rickshaws, have emerged as a cleaner, more efficient alternative, with zero tailpipe emissions. However, the successful adoption of electric three-wheelers depends on understanding the preferences and challenges faced by auto-rickshaw drivers, who are key to the Intermediate Public Transport (IPT) system. Based on this motivation, the study contributed to the literature by analyzing stated preference survey data from 2,403 respondents who purchased electric tricycles in 2023. We provide insights into the relationship between consumer demographics (such as age, income, gender, education), Vehicle operations, Vehicle financing and Electrification perspective and their preferences for specific electric and fuel tricycle segments. Finally, we estimate consumers' preference for electric tricycles and fuel tricycles. To do this, we use a discrete choice model and estimate the impact factor of Indian consumers in purchasing electric tricycles to obtain market penetration strategies for future electric tricycles.
Efficiency of multi-armature linear pulse electromechanical power and speed converters
Authors: Bolyukh V. F. , Kocherga O. I.
Published: April 2024

Introduction. High-speed linear pulse electromechanical converters (LPEC) provide acceleration of the executive element in a short active section to high speed with significant displacement, while power-purpose LPECs create powerful power impulses of the executive element on the object of influence with minor movements. One of the areas of improvement of LPEC is the creation of multi-armature structures. Methodology. To analyze the electromechanical characteristics and indicators of LPEC, a mathematical model was used, which takes into account the interconnected electrical, magnetic, mechanical and thermal processes that occur when connected to a pulse energy source with a capacitive energy storage. The main results of the calculations were performed in the COMSOL Multiphysics software environment and confirmed by experimental studies in laboratory conditions. Results. The features of the electromechanical processes of multi-armature LPECs are established and their indicators are determined. With the help of efficiency criteria, which take into account electrical, power, speed and magnetic indicators in a relative form with different options for their evaluation strategy, it was established that multi-armature LPECs for power purposes have increased efficiency, and for high-speed LPECs the use of multi-armature configurations is impractical. The conducted experimental studies confirm the reliability of the calculated results. Originality. It has been established that almost all multi-armature LPECs for power purposes have higher efficiency compared to a converter with one armature, and for high-speed LPECs it is advisable to use traditional LPECs with one armature. Practical value. On the basis of multi-armature LPECs, models of an electromagnetic UAV catapult, a magnetic pulse press for ceramic powder materials, an electromechanical device for dumping ice and snow deposits from a power line wire, a device for destroying information on a solid-state digital SSD drive have been developed and tested. References 20, tables 4, figures 8.
Internal capacitive compensation of the reactive power of the screw electromechanical converter
Authors: Zablodskiy M. M. , Chuenko R. M. , Kovalchuk S. I. , Kruhliak H. V. , Kovalchuk O. I.
Published: April 2024

Introduction. A special category among induction machines with a massive rotor is occupied by the class of multifunctional electromechanical energy converters, which are integrated with the links of technological processes Problem. The exchange of reactive energy between the source and the electromechanical converter during periods of operation with a low load leads to a significant decrease in its efficiency and power factor. With the use of non-linear loads and taking into account possible resonance, it has become more difficult to improve the power factor by installing capacitor banks. Goal. Increasing the energy indicators of the electromechanical converter by spatial displacement of the main and additional stator windings and internal capacitive compensation. Methodology. Comparative analysis of connection schemes and spatial arrangement of stator windings when using internal capacitive compensation. Modeling and experimental studies of electromagnetic and electromechanical characteristics of a screw electromechanical converter. Results. The distribution of electromagnetic quantities was established and the choice of the angle of spatial displacement of the main and additional windings of the stator phases of the modified converter, which ensure an increase in the value of the electromagnetic torque and power factor, was justified. The results of experimental studies of the screw electromechanical converter are presented. Originality. For the first time, a method of internal capacitive compensation of reactive power is proposed for multifunctional electromechanical converters of technological purpose. Practical value. The use of the proposed method of spatial displacement of the main and additional stator windings and internal capacitive compensation will ensure an increase in the energy performance of the screw electromechanical converter. References 23, tables 3, figures 15.
The method for design of combined electromagnetic shield for overhead power lines magnetic field
Authors: Kuznetsov B. I. , Nikitina T. B. , Bovdui I. V. , Chunikhin K. V. , Kolomiets V. V. , Kobylianskyi B. B.
Published: April 2024

Aim. Development of the method of designing a combined electromagnetic shield, consisting of active and passive parts, to improve the effectiveness of reduction of industrial frequency magnetic field created by two-circuit overhead power lines in residential buildings. Methodology. The problem of design of combined electromagnetic shield including robust system of active shielding and electromagnetic passive shield of initial magnetic field solved based on of the multi-criteria two-player antagonistic game. The game payoff vector calculated based on the finite element calculations system COMSOL Muliphysics. The game solution calculated based on the particles multiswarm optimization algorithms. During the design of combined electromagnetic shields spatial location coordinates of shielding winding, the currents and phases in the shielding winding of active shielding, geometric dimensions and thickness of the electromagnetic passive shield are calculated. Results. The results of theoretical and experimental studies of combined electromagnetic passive and active shielding of magnetic field in residential building from power transmission line with a «Barrel» type arrangement of wires presented. Originality. For the first time the method of designing a combined electromagnetic shield, consisting of active and passive parts, for more effective reduction of the magnetic field of industrial frequency created by two-circuit overhead power lines in residential buildings is developed. Practical value. Based on results of calculated and experimental study the shielding efficiency of the initial magnetic field determined that shielding factors whith only electromagnetic passive shield is more 2 units, whith only active shield is more 4 units and with combined electromagnetic passive and active shield is more 10 units. It is shown the possibility to reduce the level of magnetic field induction in residential building from power transmission line with a «Barrel» type arrangement of wires by means of a combined electromagnetic passive and active shielding with single compensating winding to 0.5 μT level safe for the population. References 53, figures 15.
Experimental electromagnetic compatibility of conducted electromagnetic interferences from an IGBT and a MOSFET in the power supply
Authors: Lahlaci M. E. , Miloudi M. , Miloudi H.
Published: April 2024

Introduction. Most electromagnetic compatibility studies carried out in the context of power switch research are generally valid for low frequencies. This frequency restriction appears to be too restrictive for a complete analysis of the electromagnetic interference conducted. The novelty of this work lies in the load-dependent an optimal selection of IGBTs and MOSFETs for least-disturbance power switching in the frequency range from 150 kHz to 30 MHz, based on an optimal experimental selection procedure and show the impact of load value on switch switching and noise generation. Purpose. Analysis of the fundamental possibility of selecting a switching device with a power supply based on an experimental measurement which allows to increase the reliability of the entire mechanism operation and significantly simplify the design. Methods. In this paper, the proposed study is used and compared with experimental results at low and high frequencies. Then, a comparison is made for conducted electromagnetic interference (common-mode and differential-mode) generated by IGBT and MOSFET for different loads, and the proposed methodology is verified on an experiment suitable for predicting terminal overvoltage analysis and conducted electromagnetic interference problems. Practical value. The primary method for establishing a conducted electromagnetic interference source for switching devices is based on IGBT and a MOSFET depending on the resistive load. References 22, figures 17.
Obtaining the maximum power from the source using step-up and step-down type pulse regulators that work on battery
Authors: Romashko V. Y. , Batrak L. M. , Abakumova O. O.
Published: April 2024

Introduction. Pulse regulators are widely used to match the output resistance of the source with the load resistance in order to ensure the possibility of taking maximum power when the value of the load resistance changes. Problem. In the case of using non-traditional and renewable sources of electrical energy, for a more uniform supply of energy to the load, a battery is often connected to the output of the pulse regulator, which works in buffer mode. In such cases, the load for the pulse regulator will be the battery itself, and the role of the source load will be performed by the input resistance of the regulator. To ensure the mode of operation of the pulse regulator, in which the maximum power will be transmitted from the source to the load, it is necessary to know the regulating characteristics of the regulator. There are works that analyze the regulating characteristics of step-up and step-down pulse regulators, which are used to match the load with the output resistance of the source. At the same time, for the same purpose, pulse regulators of the step-up and step-down type can be used. Goal. The purpose of the work is to analyze the features of the operation of step-up and step-down type pulse regulators in the mode of maximum power transmission from the source to the battery, as well as to determine the conditions under which it is possible and appropriate to use such regulators for the specified purpose. Methodology. The regulating characteristics of step-up and step-down type pulse regulators with sequential and parallel switching on of the controlled key were determined and analyzed, taking into account the presence of a battery at their output. Results. It is shown that the transfer of energy from the source to the battery is possible only under certain modes of operation of the regulator, which depend on the type of regulator, as well as the amount of voltage on the battery. The conditions under which it is possible to draw the maximum power from the source are determined. Originality. Since the output resistance of the source and the load resistance are of the same order in the maximum power selection mode, the internal resistance of the power source was taken into account when determining the regulating characteristics of the regulators. Practical value. The obtained results made it possible to formulate practical recommendations for a justified choice of the regulator’s operating modes, depending on its type and the value of voltage on the battery. References 15, tables 1, figures 4.
Analytical determination of a quasi-stationary electromagnetic field created by magnetic moments and eddy currents in conducting half-space
Authors: Vasetsky Yu. M.
Published: April 2024

Aim. Study of the distribution of a three-dimensional alternating quasi-stationary electromagnetic field at the surface of conducting half-space with strong skin-effect, the source of which is an arbitrarily oriented magnetic moment. Methodology. The expressions for non-uniform electromagnetic field with strong skin effect are used for the analysis, which is based on the found exact analytical solution of the general three-dimensional problem and the use of expansion into asymptotic series with respect to a small parameter that is proportional to the ratio of the field penetration depth to the distance between the sources of the external field and the surface of body. Specific expressions at the surface are completely determined by the known field of external sources. In this work, the external magnetic moment field is used. Results. For strong skin effect, expressions for the electric and magnetic field strength are obtained separately for the components of the magnetic moment oriented perpendicularly and parallel to the flat surface between the dielectric and conducting areas. The features of the electromagnetic field distribution are analyzed depending on the value of introduced small parameter. The results are presented for the module and phase shift of the field strength with respect to the phase of the external field source. Originality. The expressions found for the electromagnetic field appear to be more general than the use of closed contours with alternating current, since they extend types of external field sources and allow the use of the superposition method instead of integration over the entire contour. Practical value. The found specific analytical expressions of the electromagnetic field at the surface for the external field of magnetic moments significantly simplify the solution of the problems, since they do not require additional solution of the field equations. References 20, figures 8.
INFLUENCE OF ELECTROLYSIS CONDITIONS ON THE COMPOSITION OF ELECTROLYTIC COMPOSITE COATINGS BASED ON COBALT
Authors: Nenastina Tetiana , Sakhnenko Mykola , Djenyk Anatoly
Published: April 2024

The composite coatings electrodeposition with the refractory metals with cobalt makes it possible to obtain a coating with a unique combination of physicochemical properties that are unattainable when using other application methods. One of the reasons for the limited use of the electrolytic method of coating with such composites is the difficulty of controlling the process. The properties of alloys of the iron subgroup with refractory metals and composites depend not only on the chemical composition (the content of the refractory component) but also on the deposition conditions. By varying the composition of the electrolyte in galvanostatic mode it is impossible to obtain high-quality composite coatings with a high content of refractory components and current efficiency. As an alternative, it was suggested the use of pulsed electrolysis mode that allows to improve the producing of composite coatings. The process of formation of composite electrolytic coatings based on cobalt Co-W-ZrO2 on a copper substrate in pulse mode with a diphosphate-citrate electrolyte was investigated. The effect of current density, pulse duration and frequency on the coating composition, surface morphology, and current efficiency of compositional electrolytic coatings based on cobalt with refractory metals. An increase in current density causes a decrease in the content of refractory metals in compositional electrolytic coatings and an increase in oxygen content. The resulting coatings differ in a uniformly developed surface without cracks, which provides a sufficiently high adhesion. It is established that the size of the globe on the surface of the alloy decreases with increasing current density to 10 A/dm2. The control of the composition of Co-W-ZrO2 galvanic alloys in a quite wide range of alloying components concentrations is being achieved by varying the parameters of the pulse electrolysis, which allows adapting of the deposition technology to the needs of the modern market.
IMPROVEMENT OF DIMENSIONS AND CHARACTERISTICS OF THE VORTEX CHAMBER PUMP FOR COAL-WATER MEDIUM DELIVERING
Authors: Rogovyi Andrii , Ren Qingsheng , Wang Xingrong , Neskorozhenyi Artem , Timchenko Yevhen
Published: April 2024

The vortex chamber pump combines the positive characteristics of the centrifugal pump and the jet pump, and its efficiency is much higher than that of the classical jet pump. This pump differs from the vortex injector by having the pump flow into the tangential outlet channel, which is not available in the vortex injector. The traditional bulk material pump in many aspects has certain shortcomings, these shortcomings limit its application scope and use effect, the traditional bulk material pumps mechanical parts and seals rapidly wear, resulting in short service life. Based on solving the Reynolds equations for water flow, the influence of the angle between the tangential channels of the pump on the energy characteristics is analyzed: an increase in the angle to 180° leads to a decrease in the relative efficiency by 30 %, the outlet pressure by 12 %, and the suction flow rate by 14 %. Thus, the design with a zero angle between the tangential active medium inlet and the tangential outlet channels is optimal in terms of energy-saving pumping performance. As the diameter of the vortex chamber increases, there is no significant trend in the efficiency of the pumped fluid be the vortex chamber pump. With the increase in the total supply pressure, the axial inlet flow rate increase is relatively slow, and the outlet flow rate increases in a parabolic trend. The wear of the pump vortex chamber wall depends on the mass flow rate of coal entering the vortex chamber. The larger the mass flow rate of the abrasive medium, the greater the erosion rate density and the mean volume fraction in the vortex chamber of the vortex chamber pump. The smaller the particle diameter of the coal, the larger the erosion rate density and mean volume fraction in the vortex chamber of the vortex chamber pump. Thus, an increase in particle size should be sought, which will result in less wear.
DEVELOPMENT OF NEW DESIGNS OF HORIZONTAL BULB HYDROTURBINES
Authors: Krupa Yevhenii , Demchuk Roman
Published: April 2024

The key aspects and methods of increasing the energy and operational efficiency of hydraulic turbine equipment at hydroelectric power plants areconsidered. A detailed analysis of directions for improving the main indicators characterizing the advantages of horizontal-type bladed hydraulicturbines has been carried out. Particular attention is paid to direct-flow rotary-blade hydraulic turbines with a horizontal axis of rotation for thehydraulic unit. These hydraulic turbines offer significant advantages over those using a spiral casing for water supply, including high throughput and awide range of operating pressures and flow rates. The focus of the article is on the advantages of direct-flow bulb hydraulic turbines and their potentialuse at high pressures. However, existing direct-flow hydraulic units operate at low heads of up to 25 m. Therefore, there is a need to develop newdesigns for these turbines to operate efficiently at higher heads up to 280 m, expanding the reliable operation zone. The paper examines new designsolutions for which Ukrainian patents have been received, aiming at the effective use of horizontal bulb hydraulic units. The text highlights theproblems of increasing the energy and operational performance of hydraulic turbine equipment at hydroelectric power plants, presenting importanttasks for researchers to optimize structures and improve efficiency. Recommendations for carrying out numerical modeling in CFD (ComputationalFluid Dynamics) programs are proposed to provide a detailed understanding of hydrodynamic processes in the flow parts of hydraulic turbines. Thepurpose of numerical modeling is to evaluate the efficiency and productivity of new hydroturbines in different operating modes. This includesanalyzing the pressure distribution, flow rate and other characteristics inside the turbine. The obtained data will allow to identify potential "weak"points and optimize the blading and other structural elements for maximum efficiency. This integrated research approach, including both experimentaland multiple methods, will contribute to the development of efficient and reliable hydroturbines in line with modern requirements for sustainableenergy development.
INCREASING THE EFFICIENCY OF THE DRILLING MACHINE WITH STRUCTURAL ORGANIZATION
Authors: Cherpakov Mykyta
Published: April 2024

The purpose of the article is to consider the method of structural organization of hydropneumatic units and its practical application. The synthesis of control devices of hydraulic and pneumatic units is an actual question, since at this stage the main technical characteristics affecting quality and functioning are formed. A significant element is the chosen structural organization, since the rationality of its structure affects not only speed, ease of operation and rationality of the scheme itself but also standardization and ease of device creation. Thanks to the definition of the structural organization of hydropneumatic units, namely its elements and the interaction between them in a discrete-analog system, an example of the construction of a hydropneumatic system of a drilling machine was considered. In the article, the main components of the structural organization are considered, a scheme is built, based on which, when designing a hydropneumatic unit, it is realistic to reduce the number of memory elements and logical elements. The sets and subsets of this structure are considered, the input and output signals of the hydropneumatic unit are determined. The memory block and its control unit are considered. Coincidence blocks and inclusion division blocks are considered. The scheme of the drilling machine is presented and its description is made with the indication of the element base. The beginning of the operation of this scheme is described and the operation graph for technological transitions within it is constructed. A table of inclusions for the scheme is built, which contains information about the current positions of executive devices and their operating mode, its current state, as well as about the interaction of input and output devices. The definition of the concept of the graph is provided. CPRs were constructed for transition states, taking into account the signals that move the system to the next state and the signals acting inside the transition. The respective systems of linear equations were minimized. The place of logical controllers in this structural organization is considered.
SISTEM PENDUKUNG KEPUTUSAN PEMILIHAN KETUA RT/RW BERBASIS WEB MVC MENGGUNAKAN METODE TOPSIS (Studi Kasus: RT.02/RW.09 Griya Satria Bukit Permata Purwokerto)
Authors: Tirtayasa Arta , Yeri Kristiyanto Daniel
Published: April 2024

Pemilihan ketua RT/RW merupakan tata cara pemilihan ketua RT/RW yang merupakan bagian dari pemilihan umum di Indonesia. Namun, proses pemilihan ketua RT/RW di lingkungan RT.02/RW.09 Griya Satria Bukit Permata Purwokerto masih terkendala efisiensi, ketepatan, dan pengoperasian yang manual. Oleh karena itu, diperlukan suatu sistem pendukung keputusan yang dapat membantu proses pemilihan ketua RT/RW. Pendekatan Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) yang digunakan oleh sistem pendukung keputusan pemilihan ketua RT/RW berbasis web Model-View-Controller (MVC) dapat membantu proses tersebut. Seleksi dilakukan dengan menganalisis dan memilih kandidat terbaik berdasarkan kriteria yang telah ditetapkan. Tujuan dari penelitian ini adalah untuk membuat sistem pendukung keputusan pemilihan ketua RT/RW berbasis web MVC dengan menggunakan metode TOPSIS untuk membantu dalam pemilihan calon ketua RT/RW di RT.02/RW.09 Griya Satria Bukit Permata, Purwokerto. Diharapkan temuan penelitian ini dapat membantu dalam pemilihan ketua RT/RW di lingkungan RT.02/RW.09 Griya Satria Bukit Permata Purwokerto dan mempermudah pemilihan calon ketua RT/RW.
Rancang Bangun Sistem Informasi Pelatihan Pada Balai Diklat Industri (BDI) Padang Berbasis Mobile Application Menggunakan API
Authors: Suryamen Haris , Wistia Rizalmi Annisa , Wahyuni Ullya Mega
Published: April 2024

Balai Diklat Industri (BDI) Padang fokus pada pelatihan dalam bidang border dan fesyen dengan tujuan mengembangkan kemampuan individu atau kelompok. Saat ini, pelatihan dioperasikan melalui aplikasi berbasis website menggunakan perangkat laptop, namum terdapat keterbatasan fitur yang menghambat efektivitas pengelolaan pelatihan. Masalah utama terkait fitur aplikasi website saat ini meliputi keberagaman menu yang mempersulit karyawan dalam pencarian menu terkait pelatihan, ketidakmampuan pengajar untuk mengabsen peserta melalui website, dan ketidakmampuan peserta untuk mengakses kegiatan pelatihan di BDI Padang. Oleh karena itu, BDI Padang berupaya meningkatkan manajeman pelatihan dengan mengembangkan aplikasi website menjadi aplikasi mobile. Penggunaan aplikasi mobile semakin umum dalam lingkup pekerjaan kantor memberikan fleksibilitas yang lebih kepada karyawan. Dalam pengembangan ini, API (Application Programming Interface) digunakan sebagai perantara antar sistem, dengan jenis API yang digunakan adalah RESTful API. RESTful API berfungsi sebagai penghubung antara client dan database, dengan output beruapa data JSON. Pengujian sistem dilakukan menggunakan metode black box testing untuk semua fungsional sesuai dengan rancangan awal sistem. Hasil pengujian menunjukkan bahwa semua fungsionalitas yang direncanakan berjalan sesuai kebutuhan sistem. Penelitian ini menghasilkan aplikasi mobile untuk sistem informasi pelatihan di Balai Diklat Industri (BDI) Padang.
Topic Analysis Video Debat Jelang Pemilu Presiden dan Wakil Presiden Tahun 2024
Authors: Valentina Ivana , Mu’min Aziz , Tanrico Devion , Karnalim Oscar
Published: April 2024

Mendekati pemilihan umum presiden (PEMILU) pada tahun 2024 banyak diadakan debat calon presiden dan wakil presiden sebagai sarana menyampaikan gagasan-gagasan. Untuk dapat menemukan topik dari gagasan-gagasan yang ada dalam debat bakal calon presiden dan wakil presiden yang ditayangkan dalam video debat, penelitian ini melakukan topic analisis terhadap video debat calon presiden dan wakil presiden dengan menggunakan metode Latent Dirichlet Allocation (LDA) dan K-means Clustering, untuk masing-masing pasangan calon: A (Anies-Muhaimin), B (Prabowo-Gibran)), dan C (Ganjar-Mahfud). Hasilnya dengan menggunakan K-Means Clustering topik yang didapatkan lebih banyak, beragam, dan lebih merata topiknya untuk setiap paslon. Sedangkan topik LDA mendapatkan topik lebih sedikit dan lebih berhasil mendapatkan topik untuk paslon A. Berdasarkan standar yang telah dibuat, efektivitas pencarian topik berbeda-beda keberhasilannya disetiap dataset. Pada dataset 1 dengan model LDA didapati gagasan pasangan calon untuk paslon A 60%, B 25%, dan C 0%. Pada dataset 2 dengan model K-Means didapati gagasan pasangan calon untuk paslon A 37.04%, B 25%, dan C 17.24%. Pada dataset 2 dengan model LDA didapati gagasan pasangan calon untuk paslon A 100%, B 40%, dan C 0%. Pada dataset 2 dengan model K-Means didapati gagasan pasangan calon untuk paslon A 35.71%, B 14.29%, dan C 28.57%.
SIMULASI MONTE CARLO UNTUK ESTIMASI PENGADAAN ATK (STUDI KASUS DI INSTITUT TEKNOLOGI PADANG)
Authors: Habdillah Hamdi , Na’am Jufriadif
Published: April 2024

Alat Tulis Kantor (ATK) merupakan salah satu kebutuhan operasional di Institut Teknologi Padang (ITP). Pengadaan ATK dilakukan dan 2 kali dalam satu tahun dengan pengajuan anggaran per tahunnya. Pengelolaan ATK dilakukan secara manual mulai dari permintaan hingga sistem transaksi. Kondisi saat ini mengakibatkan perencanaan pengadaan tidak terukur, sehingga terjadi kekurangan beberapa item barang tertentu ditengah periode atau penumpukan beberapa item barang tententu di akhir tahun. Bagaimana membantu bagian pengadaan untuk menentukan estimasi pengadaan, sehingga dapat menyediakan barang secara optimal serta penggunaan anggaran yang lebih efektif dan efisien untuk periode yang akan datang. Pengolahan dilakukan terhadap data transaksi ATK dengan menggunakan metode simulasi Monte Carlo. Tahapan simulasi dengan menentukan probabilitas, menghitung distribusi kumulatif, menetapkan interval dari angka acak, bentuk bilangan acak dan membuat simulasi. Hasil simulasi yang dilakukan dapat menentukan estimasi jumlah pengadaan barang serta dapat menekan biaya pengadaan sebesar 25,6% jika dibandingkan dengan pengadaan pada periode semester genap sebelumnya.
Single-Stage Lateral Anterior-to-Psoas Interbody Fusion and Facet Screws as a Treatment for L5–S1 Adjacent Segment Disease in a Patient With a Long-Segment Construct
Authors: Challa Akshara Sree , Kumar Vignessh , Urakov Timur
Published: April 2024

Objective: Adjacent segment disease (ASD) occurs in 9% of patients with long-segment lumbar spine fusion and results from the transmission of a greater degree of stress to the segments cranial and caudal to a fused segment. The treatment of symptomatic ASD typically involves extending fusion to the involved segment. Revision and extension of posterior instrumentation bears the disadvantage of involving the exposure and modification of old hardware. Lateral interbody fusion cannot be performed at L5/S1 due to the iliac crest. Anterior lumbar interbody fusion typically still requires flipping the patient to augment the construct posteriorly. Here, we present a method to treat L5/S1 ASD using single-position anterior-to-psoas (ATP) interbody fusion combined with facet screw instrumentation.Methods: An 80-year-old man, who had undergone L2-5 fusion 27 years ago, presented with persistent lower back pain and gait dysfunction with imaging findings of L5/S1 spondylosis and ASD. Under intraoperative computed tomography navigation, left L5/S1 ATP interbody fusion was performed with simultaneous L5/S1 percutaneous facet screw fixation. Results: The abdominal incision was 4.0 cm and the single posterior incision was 1.5 cm long. Blood loss was lower than 10 mL, and the procedure lasted for less than 1.5 hours. The patient was discharged to rehabilitation after 3 days.Conclusion: ATP interbody fusion enabled the placement of an interbody device with a large footprint to promote fusion and reduce the risk of subsidence and pseudoarthrosis. The combined use of interbody fusion and facet screws obviates the need to link to the previous construct.