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Found 6374 publications

A Preliminary Study on Laser Surface Texturing of Passenger Car Engine Piston Rings

András Lajos Nagy Attila Schweighardt Gabor Laki Gergely Kovács

Publication Name: Fme Transactions

Publication Date: 2025-01-01

Volume: 53

Issue: 2

Page Range: 252-259

Description:

Laser surface texturing offers a possible solution for reducing friction between sliding surfaces in engineering applications. Optimized surface topography can also contribute to reduced wear and elevated longevity by modifying the load and speed-dependent friction state in a system. This preliminaryexperimental study investigates the applicability of affordable fibre laser marking systems for microtexturing piston rings, in order to achieve a measurable reduction in friction under subsystem model conditions. A selection of textures are applied to chromium-coated cast iron piston rings. The resulting surface topographies are characterized through confocal microscopy and subjected to friction testing. A correlation analysis is conducted on surface topography parameters to identify key laser process parameters. Findings indicate an improvement in the range of 7–8% in terms of friction coefficient with appropriate texture size.

Open Access: Yes

DOI: 10.5937/fme2502252L

Control-Oriented Model for Energy-Efficient Electric Vehicle

Tamás Luspay Zoltan Pusztai Ferenc Friedler

Publication Name: Proceedings of the International Symposium on Applied Machine Intelligence and Informatics Sami

Publication Date: 2025-01-01

Volume: Unknown

Issue: Unknown

Page Range: 299-304

Description:

In this paper, a control-oriented Linear Parameter Varying (LPV) model of an energy efficient electric vehicle is proposed, designed for model-based control to minimize energy consumption. The control inputs of the model include the torque reference and the actual cornering radius. The LPV model assesses the impact of cornering on driving resistances and, consequently, on energy consumption, which represents a novel approach. Due to the driving characteristics and the model nonlinear dynamics of the vehicle, a velocity-linearization based method was applied to obtain the parameter-dependent form. The obtained LPV model was then validated by using logged driving data, showing a root mean square error (RMSE) of 0.4682 m/s compared to the measured speed profile, thereby confirming the model's accuracy. The proposed LPV model can be utilized to develop energy-efficient driving strategies, making it highly relevant for the design and operation of energy-efficient vehicles.

Open Access: Yes

DOI: 10.1109/SAMI63904.2025.10883184

Contribution to the taxonomy of the West-African Rotundabaloghiidae (Acari: Uropodina)

Sergey G. Ermilov Jenő Kontschán

Publication Name: Acarologia

Publication Date: 2025-01-01

Volume: 65

Issue: 2

Page Range: 306-312

Description:

The second representative of the family Rotundabaloghiidae (Rotundabaloghia (Cir-cobaloghia) togoensis n. sp.) of Togo is discovered and described. It differs from the congeners based on the pilose v6, v7 and v8 setae, the apically peaked female genital shield, oval pits on dorsal and ventral idiosoma and the R-shaped peritremes. The list and an identification key to the West African rotundabaloghid mites is presented.

Open Access: Yes

DOI: 10.24349/5e51-9ewd

The adaptation of the triple bottom line model to the pet industry: A holistic approach to sustainability

Veronika Keller Balázs Répási

Publication Name: International Journal of Innovative Research and Scientific Studies

Publication Date: 2025-01-01

Volume: 8

Issue: 3

Page Range: 4325-4334

Description:

The pet industry has undergone a significant transformation, evolving into a more sustainable landscape. This reflects a collective commitment to environmental protection and the health and well-being of pets. The research presents a comprehensive analysis of the theoretical foundations of the Triple Bottom Line (TBL) model, with the objective of gaining insights into its framework and structure. The objective was to develop a version of the model that would enable comparison of the sustainability performance of different companies within the pet industry, based on the key features that are common to all pet food manufacturers. The findings of the in-depth interviews conducted for this study indicate that companies with a focus on sustainable business practices place significant emphasis on ensuring compliance with specific safety regulations for the benefit of pet health. The ratio of revenue from eco-friendly products demonstrates a markedly disparate trend among the manufacturers under analysis.

Open Access: Yes

DOI: 10.53894/ijirss.v8i3.7507

Effects of Location and Height of Vortex Generators on Aerodynamic Performance of NACA 4412 Airfoil

I. Lakatos Dénes Ágoston Solnay József Molnár

Publication Name: Periodica Polytechnica Transportation Engineering

Publication Date: 2025-01-01

Volume: 53

Issue: 3

Page Range: 267-276

Description:

This study focuses on the aerodynamic effect of vortex generators (VGs) placed on the wing surface, with a focus on the height and chordwise position of the VGs. NACA 4412 airfoil was used for the investigation, which is a frequently used and well-researched airfoil in the aerospace industry, with a chord length (c) of 200 mm. Six different configurations have been analyzed with Computational Fluid Dynamics (CFD), with three chordwise positions (x) and two trailing edge heights (h). The results showed that VGs placed furthest from the leading edge (x/c = 20%) were able to increase lift and reduce drag to the greatest extent. In terms of height, the shorter (h/c = 0.5%) VGs produced the most lift. These results provide valuable insights as to how vortex generator design can be optimized for aerodynamic performance across various operating conditions.

Open Access: Yes

DOI: 10.3311/PPtr.38258

A Localized Multi-level Method of Fundamental Solutions for Inhomogeneous Problems

Csaba Gáspár

Publication Name: Lecture Notes in Computational Science and Engineering

Publication Date: 2025-01-01

Volume: 153 LNCSE

Issue: Unknown

Page Range: 345-354

Description:

A localization technique is proposed to solve some elliptic problems based on the classical Schwarz overlapping method. The original problem is converted to solving a sequence of subproblems (which are much less than the original problem) resulting in an iterative method. The local problems are solved by the Method of Fundamental Solutions. The localization technique makes it possible to apply the method to inhomogeneous problems and to more general problems as well. The method can be embedded into a natural multi-level context, which significantly improves the computational efficiency. As a further application, the proposed method is applied to the scattered data interpolation problem.

Open Access: Yes

DOI: 10.1007/978-3-031-86173-4_35

Mitigating harmful content on social media via platform regulation: The Digital Services Act and content assessment

Gergely Gosztonyi János Tamás Papp Gergely Ferenc Lendvai

Publication Name: Informacios Tarsadalom

Publication Date: 2025-01-01

Volume: 25

Issue: 2

Page Range: 59-72

Description:

The Digital Services Act (DSA) implements a legal framework for digital services, including social media platforms, to ensure that they operate in responsible, accountable ways. With an objective involving three critical theoretical pillars—transparency, accountability, and responsibility—the DSA, among other functions, (mostly) holds online platforms liable for content that they publish and also imposes requirements that they mitigate and remove harmful content. However, from a critical standpoint, the DSA begs some pivotal questions. For one, how can such a legal document, even if binding, mitigate the severe societal, psychological, emotional, and even physical dangers and detriments experienced by victims of social media abuse? For another, how can a supranational regulation combat local disinformation campaigns and political propaganda? In this article, we encourage not only introducing, analyzing, and critically examining the DSA but also propose policy recommendations to ameliorate content moderation on social media platforms.

Open Access: Yes

DOI: 10.22503/inftars.XXV.2025.2.4

Shear buckling performance of welded I-girders with partially stiffened web at the support

G. Hajdú Hartmut Pasternak

Publication Name: Bauingenieur

Publication Date: 2025-01-01

Volume: 100

Issue: 1-2

Page Range: 21-32

Description:

This paper presents findings from tests and numerical simulations conducted on plate girders with varying end post configurations. Although EN 1993–1–5:2024 provides design guidelines for both rigid and non-rigid end posts, it does not cover the shear resistance of webs that are only partially stiffened. Partial-depth stiffeners pose potential risks due to the limited research into their mechanical behaviour. To investigate this issue, tests and parametric studies were per-formed on beams with differing web slenderness using advanced numerical simulations. EN 1993–1–5:2024 provides reliable estimates for fully stiffened beams, while new shear buckling curves have been proposed for partially stiffened beams.

Open Access: Yes

DOI: 10.37544/0005-6650-2025-01-02-55

Sustainable Capacity Expansion in Family-Owned Food Enterprises: Mechanisms for Reducing Harmful Emissions

Márta Konczos Szombathelyi Marzia Ingrassia Kinga Nemes Péter Kovács

Publication Name: Chemical Engineering Transactions

Publication Date: 2025-01-01

Volume: 121

Issue: Unknown

Page Range: 7-12

Description:

In response to global sustainability demands, this study aims to assess how family-owned food industry enterprises integrate emission reduction mechanisms into their capacity expansion strategies, with the goal of identifying key internal decision-making drivers and evaluating their environmental effectiveness. Family-owned food enterprises were chosen as they dominate the European agro-food sector and, through their long-term orientation and intergenerational responsibility, provide a unique context for aligning growth with sustainability. Energy usage and investment data from five such businesses were analysed over a three-year period. While energy data supported quantitative modelling of emission trends, the investment records—extracted from sustainability reports—were qualitatively assessed and coded according to their alignment with three internal decision-making drivers: socio-emotional wealth, intergenerational cooperation, and heterogeneous governance. Results reveal a consistent trend of investments in energy-efficient technologies, process optimisation, and renewable energy adoption. These efforts led to quantifiable reductions in emission intensity, with CO2 intensity decreasing by 8.8 % and energy use per falling below OECD benchmarks (1.66 MWh/t). In parallel, production capacities increased by approximately 15 %, demonstrating that growth and environmental performance can be aligned. The findings demonstrate that long-term-oriented family firms are aligning growth with sustainability goals. This research contributes to sustainable industrial development literature by evidencing that environmental responsibility and production expansion can be pursued simultaneously.

Open Access: Yes

DOI: 10.3303/CET25121002