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Found 6342 publications

Test on railway vehicle-runway dynamic system for stress analysis of a carriage's body

Emil Halmos László Bozóky Vince Nagy Zoltan Varga

Publication Name: Proceedings of the Mini Conference on Vehicle System Dynamics Identification and Anomalies

Publication Date: 1998-12-01

Volume: Unknown

Issue: Unknown

Page Range: 115-122

Description:

Damages at vehicle bodies required an analysis to qualify the vehicle-runway system. The aim of the analysis is to declare critical effects and show the possible and necessary measurements. The running tests on the vehicle had many objects. Effects of waveform could be seen in the spectral density functions for vehicles running on runway with waved rail wearing. Effects of waveforms were found to be little on the mechanical stresses of vehicle body. The curve of the runway has major effect on the values of the mechanical stresses.

Open Access: Yes

DOI: DOI not available

Energy Storage System Selection by Using Complex Intuitionistic Fuzzy Rough MCDM Technique Based on Schweizer-Sklar Operators

Dragan Pamucar Tahir Mahmood Ubaid Ur Rehman Ahmad Idrees Ubaid Ur Rehman Ubaid Ur Rehman Ubaid Ur Rehman

Publication Name: Contemporary Mathematics Singapore

Publication Date: 2025-01-01

Volume: 6

Issue: 5

Page Range: 7011-7040

Description:

Energy Storage System (ESS) is a talented solution to overcome the intermittency (that they do not produce energy all the time) and demand-supply misalliance problems in different renewable energy systems. Selecting the most optimal ESS requires the consideration of different conflicting criteria under uncertainty. This study presents a novel Multi-Criteria Decision-Making (MCDM) framework based on Complex Intuitionistic Fuzzy Rough Sets (CIFRSs) and Schweizer-Sklar aggregation operators to facilitate a more comprehensive and flexible ESS selection process. Specifically, we develop new aggregation operators namely, the Complex Intuitionistic Fuzzy Rough (CIFR) Schweizer-Sklar weighted average and the CIFR Schweizer-Sklar weighted geometric operators to model imprecise, vague, and inconsistent information. CIFR-MCDM methodology captures the intuitionistic, roughness and extra related fuzzy information in one structure. A case study is performed to illustrate the applicability of the suggested method in ranking different ESS alternatives. Comparative analysis with existing approaches confirms the robustness and effectiveness of the proposed framework in handling complex decision environments. The results highlight the potential of the CIFR-MCDM methodology to support informed and reliable ESS selection in renewable energy applications.

Open Access: Yes

DOI: 10.37256/cm.6520257242

Current Issues in Effective Learning: Methodological and Technological Challenges and Opportunities Based on Modern ICT and Artificial Intelligence

Eniko Nagy Gyorgy Molnar

Publication Name: Eai Springer Innovations in Communication and Computing

Publication Date: 2025-01-01

Volume: Unknown

Issue: Unknown

Page Range: 1-11

Description:

Today, the discourse around the current issues of effective learning is increasingly centred on modern information and communication technologies (ICT) and artificial intelligence (AI)-based methodological and technological solutions. ICT tools, such as online learning platforms, virtual classrooms and digital textbooks, have significantly transformed the educational environment, providing opportunities for personalised learning and remote access. In addition, AI-based applications, such as student performance analysis and curriculum customisation, are opening up new horizons in education. AI can create adaptive learning systems that continuously adapt to the needs and progress of students, thus increasing the effectiveness of learning. But these new technologies and methods also bring with them a number of challenges. One major challenge is digital inequality, as not all students have access to ICT tools and the Internet. Furthermore, educators need to continuously develop their digital competences to keep up with technological developments and effectively integrate new methods into teaching. There are also ethical issues, in particular data protection and student privacy. New opportunities include the use of learning analytics to help educators better understand learning processes and identify areas where students need help. Interactive and gamified learning materials developed with the help of AI can make learning more motivating and enjoyable, thereby increasing student engagement. Overall, the integration of modern ICT and AI-based methods and technologies into education offers significant benefits, but their successful implementation requires adequate infrastructural support, continuous training for teachers and digital access for students. This article provides a brief summary of all these phenomena, trends, opportunities and good practices.

Open Access: Yes

DOI: 10.1007/978-3-031-81261-3_1

Using the Newton-Raphson method in the polarization technique to solve nonlinear static magnetic field problems

Miklós Kuczmann

Publication Name: IEEE Transactions on Magnetics

Publication Date: 2010-03-01

Volume: 46

Issue: 3 PART 2

Page Range: 875-879

Description:

The paper presents and compares three potential formulations to solve nonlinear static magnetic field problems by applying the fixed point technique and the Newton-Raphson scheme. Nonlinear characteristics are handled by the polarization method in both algorithms. The proposed combination of the Newton-Raphson scheme and the polarization formulation results in a very effective nonlinear solver, because only the derivate of the characteristics, i.e., only the permeability or the reluctivity has to be used. Therefore, this method can be used to solve nonlinear problems with hysteresis, and it is faster than the classical fixed point method. © 2010 IEEE.

Open Access: Yes

DOI: 10.1109/TMAG.2009.2034260

Transformation of traditional assembly lines into interoperable CPPS for MES: An OPC UA enabled scenario

G. Pedone János Jósvai Norbert Szántó Gergő Monek B. Háy

Publication Name: Procedia Manufacturing

Publication Date: 2020-01-01

Volume: 54

Issue: Unknown

Page Range: 118-123

Description:

The exploitation of I4.0 paradigm requires the availability of adequate information across all engineering and production value chains, which is the result of aggregation and fusion of data from various heterogeneous sources, often under real-time conditions. On the one hand, this comprises a challenge for the provision of an efficient, secure and dependable information management infrastructure. On the other hand, system architects must find solutions to assure interoperability on both syntactical and semantic level with reasonable engineering costs. In this paper authors present the research outcomes related to the conceptualization of a generalized information model and a service architecture, for the transformation and integration of typical third-party, stand-alone industrial equipment-FESTO prolog-factory in the specific-into an OPC UA enhanced, Industry 4.0 interoperable CPPS for new generations of Manufacturing Execution Systems. Aim of the discussed approach is to define basic but general guidelines of applicability for the definition, modelling and provision of standardized, Industry 4.0 compliant, CPPS-based industrial services, starting off from a typical legacy industrial environment.

Open Access: Yes

DOI: 10.1016/j.promfg.2021.07.019

IMPLEMENTATION OF ATANGANA–BALEANU–CAPUTO (ABC) FRACTIONAL TIME OPERATOR ON HEAT AND MASS TRANSFER PHENOMENA OF WALTER’S-B FLUID

Muhammad Jamil N. F.M. Noor Muhammad Zafarullah Abdoalrahman S.A. Omer Ilyas Khan Thoraya N. Alharthi Aneesa Nawaz Samira Elaissi

Publication Name: Fractals

Publication Date: 2026-01-01

Volume: 34

Issue: 6

Page Range: Unknown

Description:

The aim of this study is to investigate the exact solution of the velocity field with the combined effect of heat and mass transfer of incompressible Walter’s-B fluid through porous medium via Atangana–Baleanu–Caputo fractional operator. At time t = 0, Walter’s-B fluid is at rest, after t = 0+, the plate starts to stream with unidirectional velocity. The analytical expressions for the velocity component, microrotational, mass concentration and temperature distribution are obtained by implementing the Laplace transform. The general solution is presented in terms of integral transform. Exact results for concentration, temperature, velocity field, and shear stress are displayed graphically for various parameters such as fractional parameter α, Microrotational parameter β, Prandtl number Pr, Schmidt number Sc, Thermal Grashof number Gr and mass Grashof number Gm.

Open Access: Yes

DOI: 10.1142/S0218348X26400517

Experimental Investigation on the Erosion Resistance Characteristics of Compressor Impeller Coatings to Water Droplet Impact

Cs Tóth-Nagy István Barabás Ibolya Zsoldos Pavel Novotny Richárd Takács Izolda Popa-Müller Balázs Dobos Miklós Zsolt Tabakov Norbert Kiss

Publication Name: Coatings

Publication Date: 2025-07-01

Volume: 15

Issue: 7

Page Range: Unknown

Description:

This study presents a comparative analysis of the water droplet erosion resistance of three compressor wheels coated with Ni-P and Si-P layers. The tests were conducted using a custom-developed experimental apparatus in accordance with the ASTM G73-10 standard. The degree of erosion was monitored through continuous precision mass measurements, and structural changes on the surfaces of both the base materials and the coatings were examined using a Zeiss Crossbeam 350 scanning electron microscope (SEM). Hardness values were determined using a Vickers KB 30 hardness tester, while the chemical composition was analysed using a WAS Foundry Master optical emission spectrometer. Significant differences in erosion resistance were observed among the various compressor wheels, which can be attributed to differences in coating hardness values, as well as to the detachment of the Ni-P layer from the base material under continuous erosion. In all cases, water droplet erosion led to a reduction in the isentropic efficiency of the compressor—measured using a hot gas turbocharger testbench—with the extent of efficiency loss depending upon the type of coating applied. Although blade protection technologies for turbocharger compressor impellers used in the automotive industry have been the subject of only a limited number of studies, modern technologies, such as the application of certain alternative fuels and exhaust gas recirculation, have increased water droplet formation, thereby accelerating the erosion rate of the impeller. The aim of this study is to evaluate the resistance of three different coating layers to water droplet erosion through standardized tests conducted using a custom-designed experimental apparatus.

Open Access: Yes

DOI: 10.3390/coatings15070767

Industry 4.0 for sustainable reverse waste collection: A systematic literature review

Edit Süle László Buics Marah Almelhem Ricardo Simoes

Publication Name: Journal of Transport and Supply Chain Management

Publication Date: 2025-01-01

Volume: 19

Issue: Unknown

Page Range: Unknown

Description:

Background: Despite ongoing efforts to improve resource recovery, waste continues to end up in landfills. Companies are increasingly pressured to address sustainability, particularly under the extended producer responsibility (EPR) frameworks. Objectives: This article examines how Industry 4.0 technologies can enhance the sustainability of waste collection within reverse logistics systems. By exploring the link among waste management, reverse logistics and Industry 4.0, the study identifies opportunities to improve resource use, reduce environmental impact and boost operational efficiency. Method: A systematic literature review was conducted using ScienceDirect and Web of Science database, two major databases, Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA)-guided mapping study clearly, illustrated inclusion and exclusion steps. Keywords were structured using the PEO (Population, Exposure, Outcome) approach, resulting in 47 articles analysed and categorised into five themes. Results: The review identifies five key thematic areas in the integration of Industry 4.0 technologies with reverse logistics: collection system design and optimisation, application of core Industry 4.0; stakeholder engagement and consumer participation, policy frameworks and governance and barriers to efficient collection. While Industry 4.0 tools improve routing, traceability and efficiency, their impact increases when aligned with supportive policies and user engagement. Decentralised models, EPR schemes and incentive-driven systems significantly enhance return rates and environmental outcomes. Conclusion: The synergy between technological innovation, infrastructure planning and behavioural incentives is vital for effective reverse logistics. The review highlights limited empirical validation and calls for research on aligning technology adoption with local policy and informal sector realities. Contribution: This review introduces a conceptual framework integrating five interdependent dimensions, offering a unified framework for sector-wide sustainable reverse logistics.

Open Access: Yes

DOI: 10.4102/jtscm.v19i0.1179

CONNECTION BETWEEN TRACK GEOMETRY QUALITY AND DYNAMIC VEHICLE RESPONSE AT VARIOUS SPEEDS

Csaba Ágh

Publication Name: Baltic Journal of Road and Bridge Engineering

Publication Date: 2023-01-01

Volume: 18

Issue: 3

Page Range: 169-187

Description:

Track geometry measurements are widely used for describing track quality. However, derailments and track deterioration are caused by forces arising in vehicle-track system. This research focuses on two types of vehicle response. Firstly, the inf luence of the longitudinal level irregularities on the vertical wheel-rail forces was examined. Secondly, the correlation between the lateral axle box acceleration and the cross level irregularities was investigated. Track geometry and vehicle response data were acquired simultaneously by a track recording car, formed from a passenger car, at various speeds up to 130 km/h. Vehicle-track forces were calculated based on accelerometers mounted on the car body, bogies and axle boxes, considering mass and moment of inertia. Non-linear regressions resulted in vertical vehicle-track force estimation functions. It was proven that the use of second spatial derivatives of the longitudinal level gave a better estimation than the use of reference TQIs according to European Standard EN 13848-6. A linear relationship was found between the speed and standard deviation of vertical vehicle-track forces. On straight sections with constant speed, correlation coefficients of around 0.8 were found between second spatial derivatives of cross level and lateral axle box acceleration.

Open Access: Yes

DOI: 10.7250/bjrbe.2023-18.613