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Found 6342 publications

Tribological Investigation of Applicability of Nano-Sized Cupricoxide (CuO) Ceramic Material in Automotive Vehicles

Rajmund Kuti D. Tóth J. Rohde-Brandenburger I. Szabó

Publication Name: Fme Transactions

Publication Date: 2021-01-01

Volume: 49

Issue: 2

Page Range: 335-343

Description:

Due to the continuously increasing requirements of the internal combustion engines, the lubricants and their additives have to be further developed. One possible solution is the application of ceramic nanoparticles as friction modifier and wear decreaser additives. This paper presents the tribological investigation of cupricoxide (CuO) nanoparticle mixed in neat Group 3 base oil. To analyse its properties, simplified ball-on-disc friction experiments were carried out in the tribological laboratory in the Széchenyi István University in Győr, Hungary. The arisen wear scars were analysed with different, highresolution microscopes to understand the working mechanism of the nanoparticles. The results have indicated an optimum concentration of nanoparticles at 0.5wt% where both the average friction coefficient and the wear scar diameter were reduced by 15%. The microscopical investigation revealed the reduction of copper material from the CuO material, and it has mended to the rubbing surface forming a protective film on the metal surface.

Open Access: Yes

DOI: 10.5937/fme2102335T

Extension of the Multi-TP Model Transformation to Functions with Different Numbers of Variables

Peter Baranyi

Publication Name: Complexity

Publication Date: 2018-01-01

Volume: 2018

Issue: Unknown

Page Range: Unknown

Description:

The tensor product (TP) model transformation defines and numerically reconstructs the Higher-Order Singular Value Decomposition (HOSVD) of functions. It plays the same role with respect to functions as HOSVD does for tensors (and SVD for matrices). The need for certain advantageous features, such as rank/complexity reduction, trade-offs between complexity and accuracy, and a manipulation power representative of the TP form, has motivated novel concepts in TS fuzzy model based modelling and control. The latest extensions of the TP model transformation, called the multi- and generalised TP model transformations, are applicable to a set functions where the dimensionality of the outputs of the functions may differ, but there is a strict limitation on the dimensionality of their inputs, which must be the same. The paper proposes an extended version that is applicable to a set of functions where both the input and output dimensionalities of the functions may differ. This makes it possible to transform complete multicomponent systems to TS fuzzy models along with the above-mentioned advantages.

Open Access: Yes

DOI: 10.1155/2018/8546976

Mathability of emc emission testing for mission crucial devices in gtem waveguide

Gyorgy Elmer Zoltan Kvasznicza Viktor Bagdán Ildiko Horvath István Gyurcsek

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2021-01-01

Volume: 18

Issue: 1

Page Range: 159-173

Description:

In connection with investigations related to mathability and to applications of computer-assisted methods for studying a validation of Electromagnetic Compatibility (EMC) tests is presented. This paper presents a validation of Electromagnetic Compatibility (EMC) tests performed in Gigahertz Transverse Electromagnetic (GTEM) cells as an alternative method to tests performed at Open Area Test Sites (OATS) or expensive anechoic chambers. The equipment selected for the inspection is widely used in electronic devices of crucial reliability expectations like medical measurements or electronic components for transport and industrial process control. This special engineering topic gives a good example of the wide applicability of mathability.

Open Access: Yes

DOI: 10.12700/APH.18.1.2021.1.10

Extraction System Efficiency Assessment Based on Workplace Airspace and Emissions Measurements

K. Kozma Dorka Kof-Kiss

Publication Name: Chemical Engineering Transactions

Publication Date: 2024-01-01

Volume: 114

Issue: Unknown

Page Range: 757-762

Description:

Protecting air quality is crucial to protecting human health and the environment. In addition to minimising the concentration of pollutants in the atmosphere, reducing exposure to chemical agents in the workplace air is becoming increasingly important. The research will demonstrate the importance and effectiveness of technological extraction ventilation systems used in industry through a workplace air quality measurement in a 3D printer laboratory. In our study, the emissions of air pollutants into the environment were measured by emission measurements and the impact area was determined by calculation. It was clear from the results that the concentrations of methanol and phenol were below the detection limit, so this technology does not produce these substances in concentrations that can be measured. However, in the case of e-caprolactam, a typical air pollutant in several 3D printing technologies, an exceedance of the limit was observed in the phase without the extraction system. The limit value was exceeded by 1.91 %, which represents an increased exposure. The tests carried out clearly demonstrated that concentrations in the workplace airspace were reduced by a tenth in all cases after the installation of the extraction system. The installed, activated carbon filtration system captured 90 % of the volatile organic compounds. The effectiveness of the system is greatly enhanced by the design of the disposal strategy, the use of Best Available Technology (BAT) and the filter incorporated in the extraction system.

Open Access: Yes

DOI: 10.3303/CET24114127

Comparison of performance calculation methods for solar PV systems

T. Horváth David Bozsaky Kitti Karolyfi Olivér Tóth Dániel Hegedűs Árpád Hajdu Dóra Szalai

Publication Name: Pollack Periodica

Publication Date: 2026-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

AbstractPhotovoltaic systems are increasingly applied in buildings to reduce energy costs and support sustainability. Their performance depends on factors such as panel angle, orientation, and temperature, which significantly affect energy yield. This study compares the actual output of an operating photovoltaic system with results from three calculation methods: manual estimation, 3D modeling, and artificial intelligence-based evaluation. The photovoltaic geographical information system and Rhino-Grasshopper methods proved most accurate, deviating by less than 10% from measured data due to their use of extensive, long-term meteorological datasets that ensure reliable performance prediction.

Open Access: Yes

DOI: 10.1556/606.2026.01532

Solution of the TEAM workshop problem No. 7 by the finite element method

Miklós Kuczmann Gergely Kovács

Publication Name: Przeglad Elektrotechniczny

Publication Date: 2011-01-01

Volume: 87

Issue: 3

Page Range: 99-102

Description:

This paper presents some potential formulations which can be derived from the "quasi-static" Maxwell's equations. The simulation results of the potential formulations are compared with each others focusing their CPU times and their accuracy - and with the measurement results, as well. The model -which was simulated - the TEAM workshop problem No. 7. The magnetic flux density and the eddy current were shown by the results of the simulation.

Open Access: Yes

DOI: DOI not available

TASTING TRADITIONS: THE IMPACT OF DEMOGRAPHICS AND GASTRONOMIC KNOWLEDGE IN GYŐR-MOSON-SOPRON COUNTY, IN HUNGARY

Marica Mazurek Anne Marie Lebrun Marcell Kupi Csaba Kőmíves

Publication Name: Geojournal of Tourism and Geosites

Publication Date: 2024-01-01

Volume: 56

Issue: 4

Page Range: 1708-1717

Description:

The most important objective of this study is to explore people's attitudes regarding the values of gastronomy in Győr-Moson-Sopron County. Data collection took place between September 1, 2023, and November 30, 2023 (N=784). The sample is not representative, the respondents were selected arbitrarily and randomly. The survey data was processed using JMP Pro17 Statistical software and Google forms were shared on social media platforms. The most important result of the primary research is that the study revealed the personal preferences and attitudes of respondents that influence the frequency of attendance at gastronomic events. To this end, we wanted to conduct a cluster analysis. Secondary research shows that the preservation and transmission of gastronomic culture is a key task in all historical periods. In this context, it becomes justified to examine our sample with a view to preserving cultural heritage and identity and to explore how the individuals in our sample relate to the gastronomic traditions of their region, which may influence their choices and the preservation of traditions that are part of their identity. The preservation of cultural heritage and contributions to it hold a significant role in gastronomic tourism. The implications of the results of the empirical research go beyond the borders of Győr-Moson-Sopron county and highlight the relationship between gastrotourism and local traditions.

Open Access: Yes

DOI: 10.30892/gtg.56426-1340

Modeling of loss aversion in solving fuzzy road transport traveling salesman problem using eugenic bacterial memetic algorithm

János Botzheim Peter Foldesi

Publication Name: Memetic Computing

Publication Date: 2010-12-01

Volume: 2

Issue: 4

Page Range: 259-271

Description:

The aim of the traveling salesman problem (TSP) is to find the cheapest way of visiting all elements in a given set of cities and returning to the starting point. In solutions presented in the literature costs of travel between nodes (cities) are based on Euclidean distances, the problem is symmetric and the costs are constant and crisp values. Practical application in road transportation and supply chains are often fuzzy. The risk attitude depends on the features of the given operation. The model presented in this paper handles the fuzzy, time dependent nature of the TSP and also gives solution for the asymmetric loss aversion by embedding the risk attitude into the fitness function of the bacterial memetic algorithm. Computational results are presented as well. © 2010 Springer-Verlag.

Open Access: Yes

DOI: 10.1007/s12293-010-0037-4

Computational Procedure for Determining the Shear Yield Stress-Shear Deformation Relationship in Magnetorheological Fluids from Anton-Paar Measurement Data

Dávid Törocsik Péter Horváth

Publication Name: Strojnicky Casopis Journal of Mechanical Engineering

Publication Date: 2024-11-01

Volume: 74

Issue: 2

Page Range: 25-34

Description:

In the past decade, magnetorheological fluids have been applied in various devices. This article focuses on developing a new computational procedure to determine the shear strength-shear strain relationship of magnetorheological fluids from the measurement data obtained by using an Anton-Paar rotational viscometer.

Open Access: Yes

DOI: 10.2478/scjme-2024-0022