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Found 6334 publications

Spatial Allocation of Wind Farms and Flexibility Requirements: A Genetic Algorithm-based Optimization Approach

Adrienn Dineva Endre Borcsok Rita Fleiner Ágnes Gerse

Publication Name: 2024 22nd International Conference on Intelligent Systems Applications to Power Systems Isap 2024

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

This paper addresses the impact of spatial allocation on the flexibility requirements of wind farms in the context of the mid-term development of wind energy exploitation in Hungary. As a starting point for evaluating flexibility requirements, a wind power simulation model is adopted that converts hourly wind speed time series derived from climate reanalysis into hourly aggregate power output using theoretical power curves. This simulation model allows for evaluating various flexibility metrics for both existing and hypothetical wind farms. As a second step, a Genetic Algorithm (GA) is integrated with the simulation environment to find an optimal subset of hypothetical wind farms with respect to flexibility requirements. The application of GA reveals insights into how spatially optimizing wind farm placement can significantly reduce flexibility requirements. This finding can have practical implications for policy-makers and planners in the renewable energy sector, especially given the evolving regulatory landscape and increasing focus on grid stability.

Open Access: Yes

DOI: 10.1109/ISAP63260.2024.10744302

Optimizing Experimental Design to Determine Friction and Wear Characteristics of Used Oil Contaminated with E20 Fuel †

András Lajos Nagy Dominika Pintér

Publication Name: Engineering Proceedings

Publication Date: 2024-01-01

Volume: 79

Issue: 1

Page Range: Unknown

Description:

The aim of this paper is to develop an experiment design to determine the wear and friction parameters of an SAE 0W20-grade reference oil and an SAE 0W20-grade used oil contaminated with E20 fuel. Wear tests in a ball–disc arrangement were conducted at temperatures and loads established using Design of Experiments. A surface analysis of the wear scars was performed using a digital microscope, while the oils were investigated using a viscometer and a Fourier-transform infrared spectrometer. Design of Experiments was further employed to develop two models using R software. For the reference oil, the developed model was only suitable for screening, while the model for the E20 fuel contaminated used oil showed a 9.8% difference between the measured and estimated coefficients of friction.

Open Access: Yes

DOI: 10.3390/engproc2024079057

The Application of DIC in Criminology Analysis Procedures to Measure Skin Deformation

Szabolcs Fischer Szabolcs Szalai Mykola Sysyn Jianxing Liu Brigitta Fruzsina Szívós Dániel Kocsis

Publication Name: Journal of Applied and Computational Mechanics

Publication Date: 2024-01-01

Volume: 10

Issue: 4

Page Range: 817-829

Description:

In engineering, DIC is a widely used measurement technique. Its major advantage is that it provides real-time results (displacements, accelerations, stresses, strains, deformations) of the surface under examination relatively quickly and without contact. However, its application in medicine, biomechanics, and the field of criminalistics is novel. The present research focuses mainly on the frontier areas of forensics and medicine. The research aims to define the test boundary conditions and preparatory activities to measure the surface of the animal and then human skin. Injuries caused by low-energy ballistic bullets, blunt-force trauma, and cuts and punctures caused by knives and/or blades will be investigated. The present research focuses on puncture injuries in animal skin. The main challenge is to create a speckle pattern on the surface that can track deformation well. The research is about developing and validating this. The GOM ARAMIS measurement system was applied for the measurements. This paper demonstrates that a suitable preparation, painting procedure, and measurement setup has been established to measure the above effects, i.e., to identify displacements and deformations of up to tenths of a millimeter with sufficient accuracy. The evaluation of the results will also show that this method could be used in forensic applications, the automotive industry, medical orthopedics, and the textile industry.

Open Access: Yes

DOI: 10.22055/jacm.2024.46966.4634

THE MEDIATING ROLE OF UNIVERSITY STUDENTS’ PSYCHOLOGICAL WELL-BEING IN THE RELATIONSHIP OF POVERTY PERCEPTION AND SOCIAL EXCLUSION

Hasan Tutar Eszter Lukács Selçuk Nam Jakub Jerzy Czarkowski

Publication Name: Economics and Sociology

Publication Date: 2024-01-01

Volume: 17

Issue: 2

Page Range: 194-208

Description:

A strong perception of poverty reduces the motivation to participate in social activities. Therefore, it can be argued that the perception of poverty positively affects social exclusion but that psychological well-being perceptions reflecting people's life satisfaction mediate this effect. This study investigates the mediator function of psychological well-being in the impact of poverty perception on social exclusion. This quantitative study employs the relational survey model, one of the general survey models. The data were collected from 714 university students using simple random sampling. The poverty perception scale, social exclusion scale, and psychological well-being scale were used to collect data in the research. The findings show that psychological well-being is a lever in the relationship between perceptions of poverty and social exclusion: while stronger perception of poverty parallels a more robust perception of social exclusion, a positive variable, such as psychological well-being, has an explanatory function in this relationship.

Open Access: Yes

DOI: 10.14254/2071-789X.2024/17-2/9

Improved Equations of the Classic Hunting Problem of Railway Wheelsets

Mate Antali Ervin Finta

Publication Name: Advances in Transdisciplinary Engineering

Publication Date: 2024-01-01

Volume: 59

Issue: Unknown

Page Range: 240-247

Description:

In this paper, the equations of motion are derived for a railway wheelset by the systematic linearisation of the full nonlinear description. Compared to the standard approximate equations of the literature, the new form of differential equations improves the values of some coefficients and also adds the correct values of terms from gravity and gyroscopic forces. The resulting model can be used to describe the stability loss called hunting motion, and can be included in models of whole railway vehicles.

Open Access: Yes

DOI: 10.3233/ATDE240551

Towards Predicting Business Activity Classes from European Digital Corporate Reports †

Árpád Tóth Alex Suta Péter Molnár Bence Lukács

Publication Name: Engineering Proceedings

Publication Date: 2024-01-01

Volume: 79

Issue: 1

Page Range: Unknown

Description:

Digital financial reporting enables automated analyses on vast datasets. This study illustrates the benefits of integrating XBRL and machine learning. XBRL, an open-source financial reporting language, was used to create a unified database of over 5600 IFRS-tagged reports. The IFRS taxonomy tags containing textual data on company activities were analyzed using the Zero-Shot Learning algorithm to identify specific activities. This study highlights how digital reporting and machine learning can extract and analyze textual data, offering insights into company activities and demonstrating the potential of these technologies in financial reporting.

Open Access: Yes

DOI: 10.3390/engproc2024079050

The spatial extent of the operations of small and medium-sized companies in Győr based on the personal evaluation of the executives

Adrienn Reisinger Norbert Kovács

Publication Name: Teruleti Statisztika

Publication Date: 2024-01-01

Volume: 64

Issue: 5

Page Range: 661-686

Description:

Economic processes from territorial perspective can be analyzed using various approaches such as identifying the territorial levels at which firms operate. This involves understanding where firms source their inputs from, the location of their markets and the extent of their relations with stakeholders. The paper aims to measure the spatial extent of firms based on a personal perception of small- and medium-sized enterprises’ (SMEs) owner-managers. Based on structured interviews in 2021–2022 with thirty SMEs in Győr, Hungary the paper looks for the answer to what is the spatial extent of the operations of the surveyed firms in the dimensions of inputs, outputs, relationships and corporate impacts? Exception of one of the surveyed companies, all of them are present at least at the regional level and some of them have already entered international markets as well. Firms are mostly considered local in the case of the workforce, while stocks are mainly purchased from international markets. The results of the research characterize the spatial extent of the firms, which can serve as useful information about the territorial role of SMEs for both practitioners and scholars.

Open Access: Yes

DOI: 10.15196/TS640505

Ethnobotanical and cultural significance of Chaerophyllum bulbosum in the Carpathian Basin

Gyula Pinke Attila G.L. Németh Balázs Horváth

Publication Name: Kitaibelia

Publication Date: 2024-01-01

Volume: 29

Issue: 2

Page Range: 141-159

Description:

Tuberous-rooted chervil (Chaerophyllum bulbosum) is one of the iconic plants in the Carpathian basin regarding ethnobotany. It is considered native to this region and it is known by about one hundred different Hungarian folk names and allophones. We have plenty of historical data about its gathering from the wild from the end of the 16th century, but certainly, it could have been collected much earlier by the people who lived here. In the whole Carpathian basin, mostly its tubers (and rarely the leaves as well) were gathered mainly by children, which were eaten in various forms and dishes, but most frequently raw as salad. Its popularity started to decline by the end of the 19th century, and in the middle of the 20th century, it was regarded as one of the ‘beets out of fashion’, which was slowly disappearing from the diet. From the 21st century, there is only one record about its gathering and consumption from Transylvania. In former times, along with other Chaerophyllum and Anthriscus species it was recommended to cure scorbute and diarrhoea and as a poultice for ulcers. In the Middle Ages, it was cultivated throughout Eastern and Central Europe, which could have also been true for the Carpathian Basin. Master Roger mentioned this species among the plants of devastated peasant gardens (1243, after the Mongol invasion). Thereafter, we have records only from the middle of the 19th century showing the obvious growing of its cultivated variety (called ‘chervil-beet’). However, its cultivation remained quite sporadic, and by the middle of the 20th century, it was already fully neglected. The plant occurred in Hungarian cookery books from the 16th century, especially in Transylvanian gastronomy. The remembrance of its former folk uses retained in Hungarian culture as well, it emerges in several poems and prose.

Open Access: Yes

DOI: 10.17542/kit.29.056

Online Inductance Identification Using Extended Kalman Filter for Adaptive Vector Control of Synchronous Reluctance Machine

Krisztian Horvath

Publication Name: 2024 23rd International Symposium on Electrical Apparatus and Technologies Siela 2024 Proceedings

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

This study presents an adaptive vector control method for reducing the inductance sensitivity of synchronous reluctance machine drives. In the proposed control structure, the direct and quadrature inductances are identified online by using an extended Kalman filter. Therefore, only the stator resistance of the machine parameters needs to be pre-identified during the installation process. Since variations in inductances can be tracked by the estimator, the proposed adaptive vector control is able to outperform the conventional field-oriented control in cases of inductance uncertainties, as shown by the simulation results.

Open Access: Yes

DOI: 10.1109/SIELA61056.2024.10637878