Operation Principle Research Articles

Overview of motors for heavy drones

The article is devoted to an overview of engines used in heavy drones. The main types of engines, their principles of operation, advantages and disadvantages are considered. The article examines a wide range of electric motors, such as brushless DC (collectorless) motors, which are the main components in modern quadcopters. Types of engines, their technical characteristics, as well as their use in specific models of quadcopters are also considered. This article will help you better understand the specifics of different types of motors and how they affect quadcopter functionality and performance.

3D Simulation-Driven Design of a Microfluidic Immunosensor for Real-Time Monitoring of Sweat Biomarkers.

This study presents the design and comprehensive 3D multiphysics simulation of a novel microfluidic immunosensor for non-invasive, real-time detection of pro-inflammatory biomarkers in human sweat. The patch-like device integrates magnetofluidic manipulation of antibody-functionalized magnetic nanoparticles (MNPs) with direct-field capacitive sensing (DF-CS). This unique combination enhances sensitivity, reduces parasitic capacitance, and enables a more compact design compared to traditional fringing-field approaches. A comprehensive 3D multiphysics simulation of the device, performed using COMSOL Multiphysics, demonstrates its operating principle by analyzing the sensor's response to changes in the dielectric properties of the medium due to the presence of magnetic nanoparticles. The simulation reveals a sensitivity of 42.48% at 85% MNP occupancy within the detection zone, highlighting the sensor's ability to detect variations in MNP concentration, and thus indirectly infer biomarker levels, with high precision. This innovative integration of magnetofluidic manipulation and DF-CS offers a promising new paradigm for continuous, non-invasive health monitoring, with potential applications in point-of-care diagnostics, personalized medicine, and preventive healthcare.

New Measuring and Data Transmission Equipment for Operational Oceanography at the Gelendgik Black Sea Test Site of Institute of Oceanology of the RAS

The design and principles of operation of the bottom multi-modem station MDS-II, located in the coastal zone (depth of location — 25 m) of the northeastern part of the Black Sea at the Gelendzhik Test Site of IO RAS are described. The station is connected to the coastal center by means of a bottom fiber-optic cable, through which power is supplied to the station, and online transmission of measurement data takes place. The station is an underwater server to which one can connect a measuring device and get a real-time access to it, as well as remotely control on its operation. The design of an automatic stationary station for vertical sounding (SSVS) of water column, which is also used at the Gelendzhik Test Site, is also described. This station is installed close to the MDS-II multi-modem station and is connected to one of its modems. The station consists of a bottom electric winch installed on the seabed and a floating module (probe) on a cable line wound around the winch drum. When the command ʺsoundingʺ is given, the cable unwinds and the floating module, equipped with temperature and pressure sensors, floats and measures the water temperature profile from the bottom layer to the sea surface. Then the cable is winding on a drum, and the floating module returns to the bottom layer. A prototype of a new SSVS is being developed, which will allow sounding of the water layer with a thickness of up to 100 m. It will be equipped with a multi-parameter probe that makes joint measurements of hydrophysical and bio-optical parameters.

From gavels to algorithms: The Vidhii Partners GenAI evolution

Learning outcomes This case study exposes students to the process of decision-making given the market uncertainty, evolving shareholder expectations and other variables that executives and managers must consider ensuring business continuity and growth and helps students develop an appreciation of the impact emerging technologies are having on organizational digital transformation. This case study evaluates the strategic considerations for whitespace digital solutions into existing organizational operations, balancing innovation with core operating principles; exposes the students to the drivers of fostering a culture of innovation and employee buy-in during strategic digital transformation initiatives; and evaluates and appreciates the role of key stakeholders, such as customers, employees and executive management, in shaping a successful digital transformation strategy and promoting sustained business growth. Case overview/synopsis Vidhii Partners, a leading Indian law firm, grapples with the burgeoning demand for legal services in a rapidly evolving market. Traditional methods may struggle to keep pace, prompting Vikram Wadehra, a partner, to champion the adoption of Generative artificial intelligence (GenAI) technology. Vidhii Partners embarks on the development of two GenAI tools: VidAI, an AI-powered chatbot designed to democratize access to legal information, and VidAI Pro, a business-to-business offering aimed at streamlining legal research and drafting. Wadehra envisions these tools not only enhancing efficiency but also fostering a culture of legal awareness and generating new business opportunities. However, crucial decisions remain. Can Vidhii Partners bridge the potential gap between innovation and the firm’s established practices? How can they effectively integrate GenAI into their operations while ensuring user trust and employee buy-in? This case study presents a rich opportunity to explore the challenges and opportunities associated with digital transformation in the legal sector. Students will grapple with themes such as navigating market uncertainty, fostering a culture of innovation within a traditional organization and developing effective strategies for stakeholder management during change initiatives. Through the lens of Vidhii Partners’ GenAI journey, students gain valuable insights into the complexities of embracing disruptive technologies within a dynamic business landscape. Complexity academic level This case study is designed for masters level (MBA). Supplementary materials Teaching notes are available for educators only. Subject code CSS 11: Strategy.

A flexible piezoelectric energy harvester featuring an eccentric pendulum via frequency up-conversion for human motion

This paper presents an innovative design of a flexible piezoelectric energy harvester featuring an eccentric pendulum (FPEH-P), which has two major characteristics: frequency up-conversion and large deformation that can improve output capacity. To clarify operational principles, we establish a dynamic model of the pendulum, and the vibration of the flexible piezoelectric plate is analyzed. Then, the two major characteristics of the FPEH-P are verified by experiments and simulations. Furthermore, it is verified that the FPEH-P can work at a low frequency (about 2 Hz) experimentally. Due to the large deformation of the piezoelectric plate, the maximum peak open-circuit voltage can reach 6.82 V. At an excitation frequency of 1.9 Hz and amplitude of 100 mm, the maximum average power can reach 6.06 μW. The FPEH-P can efficiently harvest energy from individuals engaged in walking, jogging, and running, as evidenced by the output load voltage and average power. Moreover, it can also output voltage under multiple motion actions. Finally, it has been verified that the high-instantaneous voltage characteristic of the harvester can provide sustainable power to a timer.

Hybrid high step-up DC-DC converter based on quadratic and switched capacitor cells with reduced voltage stress across the switches

ABSTRACT In this paper, a high step-up DC-DC converter with high voltage gain is proposed. The propounded converter has a non-isolated configuration with a miscellany of three infrastructures, namely a {R1–1} switched quadratic cell, a switched capacitor (SC) cell and an auxiliary switch. The use of {R1–1} switched quadratic cell and SC improves the voltage gain of the converter and also reduces the voltage stresses of semiconductors. {R2–5} By adding an auxiliary switch, one degree of freedom is added to the output voltage gain control. Meanwhile, the efficiency is ameliorated, especially for high voltage gains. The duty cycle of the suggested structure is not only limited to changes but also can include a wide range of changes. In addition, the propounded structure provides higher voltage gains at lower duty cycles. Also, the voltage stress of semiconductor elements is reduced compared to the structures based on switched inductor/capacitor and quadratic converters. The principle of operation and steady-state analysis are discussed in detail. Also, a laboratory prototype is built to validate claim made. The results indicate that the use of an auxiliary switch helps to progress the voltage gain.

Non-contrast MR angiography: physical principles and clinical applications in chest, abdomen and pelvis imaging.

This review article focuses on the advancements in non-contrast magnetic resonance angiography (NC-MRA) and its increasing importance in body imaging, especially for patients with renal complications, pregnant women, and children. It highlights the relevance of NC-MRA in chest, abdominal, and pelvis imaging and details various bright-blood NC-MRA techniques like cardiac-gated 3D Fast Spin Echo (FSE), balanced Steady-State Free Precession (bSSFP), Arterial Spin Labeling (ASL), and 4D flow methods. The article explains the operational principles of these techniques, their clinical applications, and their advantages over traditional contrast-enhanced methods. Special attention is given to the utility of these techniques in diverse imaging scenarios, including liver, renal, and pelvic imaging. The article underscores the growing importance of NC-MRA in medical diagnostics, offering insights into current practices and potential future developments. This comprehensive review is a valuable resource for radiologists and clinicians, emphasizing NC-MRA's role in enhancing patient care and diagnostic accuracy across various medical conditions.

Comparative performance evaluation of dual-axis solar trackers: Enhancing solar harvesting efficiency

Nowadays, renewable energy is a much discussable topic because of its important specifications such as pollution and un end sources. This paper emphasizes the importance and capabilities of the dual axis solar tracking system (DASTS) of solar cell technologies. The study carried out a practical process of a dual-axis system design, which practically demonstrates the influence of dual-axis solar trackers, including their operational principles, advantages, and associated challenges. Furthermore, it has been shown that dual-axis solar trackers can significantly increase solar energy yield by capturing maximum sunlight, making them an important advancement in improving the efficiency and effectiveness of solar energy generation. The paper also presents a performance evaluation of a solar tracker system that improved energy output by 45 % compared to the fixed solar panel (FSP) while also reducing the numerical calculation (NC) efficiency of DASTS by 3.16 %. Based on these findings, solar tracker systems can provide sustainable and environmentally friendly energy solutions that are both feasible and substantial.

Comparison between Liquid Immersion, Laser Diffraction, PDPA, and Shadowgraphy in Assessing Droplet Size from Agricultural Nozzles

Spray droplet diameters play a key role in the field of liquid plant protection product (PPP) application technology. However, the availability of various measurement techniques, each with its unique operating principles for evaluating droplet size spectra, can lead to different interpretations of spray characteristics. Therefore, in this study, four measurement techniques—Liquid Immersion (LI), Laser Diffraction (LD), Phase Doppler Particle Analysis (PDPA), and Shadowgraphy (SG)—were utilized to evaluate the droplet size distribution of agricultural spray nozzles. Additionally, PDPA and SG were used to assess the average velocity of spray droplets. Experiments were conducted in three different laboratories with the main aim of comparing results obtained with various types of equipment utilized under ordinary practical conditions. Spraying tests were carried out using three flat fan nozzles and an air-induction flat fan nozzle. As a general trend, the lowest values for droplet diameters were measured using the Laser Diffraction technique, followed by Shadowgraphy. The PDPA technique provided the highest values for mean diameters (D10, D20, and D30) and the numeric median diameter (Dn0.5), whereas the Liquid Immersion method yielded the highest values for the Sauter mean diameter (D32) and volumetric diameters (Dv0.1, Dv0.5, and Dv0.9). Importantly, all measurement techniques were able to discriminate the four nozzles based on their Dv0.5 diameter. Average droplet velocities showed a similar pattern across the four nozzles with the PDPA and the SG measurement techniques. The differences in diameter values observed with the four measurement techniques underline the necessity of always including reference nozzles in spray quality assessments to base classifications on relative rather than absolute values.

The Procedure of Extracting Natural Gas liquids in Cryosift Method

The extraction of Natural Gas Liquids (NGLs) plays a pivotal role in the modern energy landscape, serving as both a significant economic driver and a critical component of energy supply chains. This project investigates the comprehensive processes involved in NGL extraction, which includes the separation of ethane, propane, butanes, and natural gasoline from natural gas and crude oil. Key techniques such as cryogenic distillation, absorption, and fractionation are explored in depth, highlighting their operational principles, efficiency, and technological advancements. In addition to the technical aspects, this project examines the environmental impacts of NGL extraction and the strategies employed to mitigate these effects. Innovations in technology and process optimization are discussed, emphasizing their role in reducing carbon footprints and enhancing sustainability. The economic dimension of NGL extraction is also analyzed, with a focus on market trends, supply chain logistics, and the factors influencing global demand and pricing. Case studies from leading NGL extraction facilities are used to illustrate best practices, challenges, and the implementation of cutting-edge technologies. Through a multi-faceted approach, this project aims to provide a detailed understanding of the NGL extraction industry. It underscores the importance of NGLs in the global energy market, the technological advancements driving the industry forward, and the economic and environmental considerations that shape its future. The findings offer valuable insights for stakeholders, policymakers, and industry professionals seeking to navigate the complexities of NGL extraction and leverage its benefits for sustainable development. Key Words: Cryogenic Distillation, Absorption, Fractionation

Автоматизированный контроль перемещения тормозных башмаков на железнодорожном транспорте: применение RFID-технологии при закреплении подвижного состава

The possibility of introducing RFID technology in the work of railway transport is considered as one of the aspects of digitalization of the railway. The general principle of operation of this technology in securing rolling stock is described. The positive aspects of the introduction of this technology are analyzed.

Practical Aspects of the Organization of Ergonomics Committees in the Context of the Quality of Ergonomic Activities Undertaken in Manufacturing Enterprises

Theoretical background: In order to systematize ergonomic activities in the enterprise, some of them decide to establish ergonomics committees whose task is to solve problems in this area and also to propose new, often innovative solutions for implementation. The structures of these units often include employees from different departments who have a different view of ergonomics depending on the position they hold. However, the organization of ergonomics committees can cause many problems due to the lack of top-down guidelines for their activities (each company must establish its own rules). In scientific research on the ergonomic aspects of projects, there is a tendency to look for factors that favor the diffusion of ergonomic issues in their implementation. One such factor may be the creation of an ergonomics committee to pursue ergonomic goals. Their activities are not described in detail in the literature (there are no practical guidelines for their functioning), which is why the topic is discussed in this article. Purpose of the article: The main goal of this article is to present propositions for actions that can be taken to systematize the functioning of the ergonomics committees and to link this task with the quality of ergonomics management in manufacturing enterprises. The aim of the article is also to describe, using a practical examples, various aspects of the operation of ergonomics committees and to indicate guidelines for their establishment and activities. Thus, the article aims to fill the research gap in the field of creating ergonomics committees. Research methods: The research used the interview method with participants of ergonomics committees from companies from various industries. The questions were asked in the following groups: organization and functioning of the ergonomics unit in the enterprise and assessment of the effects of the ergonomics team’s activities. The respondents were participants of the ergonomics committees, which was appointed at least 2 years earlier, the industries represented by the respondents are: automotive (2 companies) and furniture production. Data obtained in three selected enterprises (through informal interviews) where such committees operate, as well as a literature review in this area, were used to formulate these suggestions. The results of the undertaken research allowed for the identification of practical aspects of the functioning and organization of the ergonomics committees. This is an innovative area of research due to the fact that few scientific studies describe such units and guidelines for their practical implementation. Main findings: The main result of the undertaken research was to indicate the categories in which the activities of ergonomics committees should be considered and to provide practical guidelines for their activity. These guidelines are presented as structured areas for consideration when establishing an ergonomics committee: (1) establishing the principles of operation and reporting; (2) determining the composition of the committee; (3) determining the scope of activity of the committee; (4) providing appropriate training for committee’s representatives; (5) support for the committee’s activities. The most important conclusion from the undertaken research is the indication that each enterprise must plan the operation of the committee taking into account its internal conditions. The conclusions from the conducted research were supplemented with indications of directions for further research into the conditions for the functioning of ergonomics committees in manufacturing companies.

Fault Detection Methods for Electric Power Steering System Using Hardware in the Loop Simulation

The development of the automotive industry is associated with the rapid advancement of onboard systems. In addition, intensive development in the electronics and control systems industry has resulted in a change in the approach to the issue of assistance systems in vehicles. Classic hydraulic systems have been almost completely replaced by modern electric power steering (EPS) systems, especially in citizen vehicles. This paper focuses on fault detection algorithms for EPS, along with the available tools to aid development and verification. The article discusses in detail the current state of knowledge in this area. The principle of operation of the EPS system and the influence of the structure of the mechanical system on its operation, in particular the characteristics of the ground–tire contact, are presented. Various error identification methods are presented, including those based mainly on a combination of tests of real objects as well as those combined with modern hardware-in-the-loop (HIL) equipment and virtual vehicle environment software, enabling the development of new diagnostic methods, enhancing the security, reliability, and energy control in the vehicle. A review of the literature indicates that although many algorithms which enable fault detection at an early stage are described, their potential for use in a vehicle is highly limited. The reason lies in simplifications, including models and the operating EPS temperature range. The most frequently used simplification of the model is its linearization, which significantly reduces the calculation time; however, this significantly reduces the accuracy of the model, especially in cases with a large range of system operation. The need for methods to detect incipient faults is important for the safety and reliability of the entire car, not only during regular use but also especially during life-saving evasive maneuvers.

Development of a Prototype Hydraulic Damping Device for Hot Water Heating Circuit in Pulse Mode

This paper provides a comprehensive exploration into the design and implementation of the hydraulic damping device within a pulse mode hot water heating loop. It outlines a systematic approach aimed at optimizing system performance, detailing the operational principles of the pulse mode heating circuit and presenting a structured construction scheme for the hydraulic damping apparatus. Accompanying this analysis is a simplified diagram illustrating the hydraulic damping system, offering a clear visual representation of its integration within the heating circuit. Through mathematical transformations, essential parameters such as complex impedance, frequency function, and vibration frequency characteristics are derived, providing valuable insights into the dynamic behavior of the system. Culminating this investigation, the paper constructs the frequency response of the circuit, offering a comprehensive understanding of its dynamic behavior across varying frequencies. This synthesis of theoretical frameworks and practical applications advances our understanding of pulse mode hot water heating technology, paving the way for enhanced efficiency and performance in heating systems.

Imaging-based terahertz pixelated metamaterials for molecular fingerprint sensing

With the rapid development of terahertz-enabled devices, the study of miniaturized and integrated systems has attracted significant attention. We experimentally demonstrate an imaging-based pixelated metamaterial for detecting terahertz molecular fingerprints related to intermolecular vibrations and large-amplitude intramolecular modes, including chemical identification and compositional analysis. The compact THz sensor consists of a 4 × 4 pixelated filter-detector array with transmission resonances tuned to discrete frequencies. The absorption spectra of analytes are computationally reconstructed from different spectral responses of meta-pixels, and the resulting information is characterized via near-field imaging. Due to the spectrometer-less operation principle, such imaging-based approaches provide an alternative method for developing sensitive, versatile, and miniaturized THz biosensors, especially for practical field deployment applications.

A review of transforming neuromorphic computing with 2D material memtransistors

In the pursuit of advancing neuromorphic computing, 2D material-based memtransistors have emerged as a promising avenue. These memtransistors offer a unique blend of attributes, including tiny dimensions, compactness, and low-power operation, making them ideal candidates to mimic human brain functionality for artificial intelligence applications. This review focuses on various 2D materials such as MoS2, WSe2, h-BN, and In2Se3, and their suitability for bio-synapse applications, highlighting their advantages over other synaptic devices. Additionally, the review suggests the development of multi-terminal memtransistor-based synaptic devices with innovative operational principles for in-memory computing applications. Finally, concludes by discussing both the current state of development and the prospects and challenges that lie ahead, aiming to inspire further progress in information storage and neuromorphic computing.

Analysis of a New Asymmetric Biased-Flux Operation for an Inter-Modular Permanent Magnet Motor

Net zero and electrification targets are continuing to enforce a need for the development of high-performance electrical machines, increasingly based on the use of rare earth permanent magnets. Biased flux motors have the potential to overcome some of the disadvantages associated with more conventional electrical machines. Since their introduction, there has been a consistent trend towards new and improved topologies, all relying on the same principles of operation. In this paper, a new alternative operation is proposed where the magnetic flux density offset of each module is different. The resulting asymmetric biased excitations of the magnets leads to a flux concentration in the air gap. Placement of magnets in the slot-opening area is shown to produce a higher average torque at a higher power factor. It is mathematically shown that the conventional methods used to investigate the effect of each group of magnets separately cannot be used for the explanation of this operation principle. Therefore, it is necessary to simultaneously consider both groups of magnets in the magnetic equivalent circuit. Due to the use of magnets in these motors, thermal conditions are also investigated. Finally, a comprehensive comparison between several stator-situated-magnet motors is presented. The performance of the proposed motor is improved in terms of average torque, torque density, PM torque density, power factor, and overload capability. The torque density specifically has increased by 9%. Moreover, both motors have suitable thermal behaviour which confirms the validity of the demagnetization analysis.

Critical Drop Height Prediction of Loquat Fruit Based on Some Engineering Properties with Machine Learning Approach

The lowest height at which a product can fall without suffering severe harm is known as the “critical drop height” for agricultural products. It is a crucial factor to take into account for crops like loquats that are prone to bruising or damage upon impact. By establishing the minimum altitude at which the product can be dropped without experiencing substantial harm, suitable processing procedures may be established from harvest to the end consumer, thereby preserving product quality and worth. The critical drop height can be ascertained through swift, affordable, non-destructive, and non-traditional methods, rather than time-consuming and expensive laboratory trials. In the study, we aimed to estimate the critical drop height for loquat fruit using machine learning methods. Three different machine learning methods with different operating principles were applied. R2, MAE, RMSE, and MAPE metrics were used to assess the models. There were no obvious differences in both the comparisons within the models, namely the training and test results and the mutual comparisons of the models. However, with a slight difference, the SVMs model performed better in the training data set, and the ETs model performed better in the test data set. Plots were drawn to visualize model performances, and the results obtained from the plots and metrics support each other.

The use of digital technologies for crisis management

Aim. To identify the role of digital technologies in the context of crisis management and the opportunities that digital tools provide for the development and growth of companies, even in the face of economic turmoil. To pay special attention to the study of effective practices of optimization and modernization of business processes using the latest digital tools, which con[1]tribute not only to increasing productivity and efficiency of business, but also its adaptation to rapidly changing market conditions.Objectives. To analyze the role of digital technologies in the context of crisis management, highlighting the opportunities that digital tools offer for the development and growth of companies, even in conditions of economic turmoil; to study the advantages of applying new business models using modern digital technologies; to consider the principle of operation of platform business models using examples and show the advantages of their use; to evaluate the financial performance of companies.Methods. The author applied the methods of complex and comparative analysis, as well as the study of foreign and domestic experience of digital transformation in crisis conditions. Considerable attention was paid to the work with periodicals, scientific articles and analytical reports in the field of crisis management and digitalization. In addition, methods of observation, generalization and comparison were used.Results. The study suggests that digital technologies contribute to improving the transparency and efficiency of business processes in crisis conditions. The main factors of successful digital transformation of organizations were identified and recommendations for their use were developed.Conclusions. According to the author’s position, the necessity of active use of innovative technologies in crisis management, as well as the importance of a strategic approach to digital transformation in a rapidly changing environment are obvious. The key element of successful crisis management is the active integration of digital technologies into business processes and the use of a strategic approach to digital transformation. Cultural and organizational aspects that ensure sufficient funding and management support are recognized as important factors. The use of online platforms allows organizations to effectively form a digital ecosystem, increasing competitiveness, which ultimately contributes to the successful achievement of business goals in a rapidly changing digital environment. The application of the proposed recommendations on the use of innovative technologies will help organizations not only to cope with the current crises, but will also contribute to their sustainable development and stabilization.

Обґрунтування вибору типу приводу стрічкового конвеєра

The designs and dynamic properties of electromechanical and hydraulic drives for a belt conveyor have been analyzed to justify their selection. The main advantages and disadvantages of their operation have been formulated. It has been established that the hydraulic drive has advantages compared to the electromechanical one for installation in a built-in drive for a belt conveyor. The design features and principles of operation of these drives have been described. Calculation schemes have been developed for the electromechanical and hydraulic drives of the belt conveyor. A mathematical model of the electromechanical drive has been constructed, taking into account the Voigt viscoelastic model for the conveyor belt, Hooke's laws for the deformation of stretching elements, equations of motion of the mechanical system, and electromagnetic phenomena in the asynchronous motor. Additionally, a mathematical model for the hydraulic drive of the belt conveyor has been constructed, which, besides the equations of motion of the mechanical system and the Voigt viscoelastic model for the conveyor belt, also includes the continuity equations of the working fluid flows in the hydraulic drive. The parameters of the belt conveyor for studying the dynamic properties of the electromechanical and hydraulic drives, which are considered in the mathematical models, have been described. The mathematical models for the electromechanical and hydraulic drives have been solved using the Mathcad software package. Theoretical curves for cases of transient processes in the mechanical system of the belt conveyor without load and with load have been constructed. Transient processes of acting torques and angular velocities have been compared by the dynamic coefficient, and it has been established that the hydraulic drive has a better indicator by 1.78 times. It has also been established that the duration of the transient process in the drive with the electric motor exceeds this parameter in the drive with the hydraulic motor by 3.5 times. It is recommended to use the built-in hydraulic drive for belt conveyors of mobile working machines because it has more advantages over the electromechanical one, and the dynamic indicators of the hydraulic drive provide better performance during operation.