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Found 6278 publications

Thermal impact assessment with hydrodynamics and transport modeling

Viola Somogyi Viktor Sebestyén A. Zseni Zoltán Papp Endre Domokos

Publication Name: Energy Conversion and Management

Publication Date: 2015-11-01

Volume: 104

Issue: Unknown

Page Range: 127-134

Description:

While the number of installed geothermal heat pump systems is rising legislation is not prepared to address the issues concerning thermal impact. The aim of this paper is to model the effects of geothermal heat pump systems installed to shallow geothermal reservoirs in sedimentary formation based on the results of a real system in order to show the magnitude of the thermal affected zone. The system examined is a standalone geothermal heat pump with a production and an injection well-being able to produce a maximum of 3.4 m3/h groundwater. The thermal impact determined by simulation was 35 m for the standalone system. Two scenarios were considered to define the impact of two neighboring open-loop systems on each other. The results show that if two systems are to be installed on the same reservoir the minimum distance should be 55 m. That indicates that in case of designing systems installed to similar hydrogeological environment should consider the change in the water table and increased thermally affected zone if other groundwater heat pumps are in the area.

Open Access: Yes

DOI: 10.1016/j.enconman.2015.04.045

Correction: Association between hand grip strength and exercise addiction: differences by sport category and sex among elite athletes (Frontiers in Psychology, (2025), 16, (1597239), 10.3389/fpsyg.2025.1597239)

Ferenc Ihász Şaban Ünver Barış Karaoǧlu Rita Kovacsik Celal Bulgay Gönül T. Demir Burcu Güvendi Angéla Somogyi Merve Alpay İsa Çiftçi Ebru Ceviz Alföldi Zoltan Attila Szabo

Publication Name: Frontiers in Psychology

Publication Date: 2025-01-01

Volume: 16

Issue: Unknown

Page Range: Unknown

Description:

Sport Psychology The title of this article was erroneously given as: Association between hand grip strength and exercise addiction among high-level athletes: differences by sport category and sex in elite athletes. The correct title of the article is: “Association between hand grip strength and exercise addiction: differences by sport category and sex among elite athletes.” The original version of this article has been updated.

Open Access: Yes

DOI: 10.3389/fpsyg.2025.1755836

Occurrence and distribution of polycyclic aromatic hydrocarbons in surface water of the Raba River, Hungary

István Vass Andrea Szabó Nagy János Szabó

Publication Name: Journal of Environmental Science and Health Part A Toxic Hazardous Substances and Environmental Engineering

Publication Date: 2013-08-24

Volume: 48

Issue: 10

Page Range: 1190-1200

Description:

The objective of this study was to investigate the concentration level and distribution of polycyclic aromatic hydrocarbons (PAHs) in surface water of the Raba River; the largest Danube tributary in Hungary. A total of 54 water samples were collected in the period of 2008-2011 and analysed for PAHs by gas chromatography-mass spectrometry (GC/MS) method. The total PAH concentrations (sum of the concentrations of 17 individual PAH compounds) ranged from 41 to 437 ng/L with the mean value of 111 ± 69.4 ng/L. Phenanthrene and naphthalene were the dominant species in the surface water. Using TEF approaches on the mean concentration PAH data, benzo[a]pyrene and dibenz[ah]anthracene contributed the highest carcinogenic exposure equivalent. A selected number of concentration ratios of specific PAH compounds were calculated to evaluate the possible sources of PAH contamination. The ratios reflected a pattern of pyrogenic input as a major source of PAHs. The comparison of the total PAH concentrations observed for Raba River with other surface waters of the world confirmed that the Raba River could not be regarded as a contaminated river according to the levels of PAHs. © 2013 Taylor & Francis Group, LLC.

Open Access: Yes

DOI: 10.1080/10934529.2013.776455

Analysis of the financing activities of European football leagues

Roman Veynberg Oleg Litvishko Olga Kokoulina Ayaz Aliev Javid Farzaliev Tamás Gyömörei

Publication Name: Economic Annals Xxi

Publication Date: 2021-06-01

Volume: 189

Issue: 5-6

Page Range: 46-56

Description:

In a market economy, effective financial management is one of the most important aspects of the functioning of any company, which plays a connecting role between various areas of its activities and determines the company's position on the market, its competitiveness, prospects for sustainable development and cost growth. In this context, the assessment of the economic efficiency of sports organizations is also relevant, due to the high social significance of the sports industry and its huge popularity among the population. The study selected leagues that use different approaches to the formation and distribution of financial resources in their activities. Thus, the subject of this research is the existing mechanisms for financing the activities of sports subjects. The comparative report of UEFA on club licensing for pre-COVID-19 period was used as an analytical basis for the study. The results obtained during the study showed that with an effective approach to the process of managing financial and economic activities, the professional sports industry can be considered as a promising tool that can generate a significant material and non-material effect on various spheres of public activity, which affects the dynamic economic growth of the industry, as evidenced, in particular, by the performance index of the football leagues of Europe calculated in the work, showing the stable growth of the industry in the pre-COVID-19 period.

Open Access: Yes

DOI: 10.21003/EA.V189-05

Effect of bacterial inoculation on co-composting of lavender (Lavandula angustifolia Mill.) waste and cattle manure

E. Lakatos Ágnes Nagy Babett Greff András Sáhó Jenő Szigeti László Varga

Publication Name: 3 Biotech

Publication Date: 2021-06-01

Volume: 11

Issue: 6

Page Range: Unknown

Description:

The primary purpose of this study was to investigate the influence of Cellulomonas flavigena and Streptomyces viridosporus, as a bacterial inoculant, on the compostability of post-extraction lavender waste. The major physicochemical, microbiological, and biological properties of the composting materials were monitored for 161 days. The technology developed was shown to improve the compostability of recalcitrant herbal residues. The use of lavender waste beneficially affected the composting process by extending the thermophilic phase, accelerating the degradation of organic matter, and elevating the viable counts of useful microorganisms; however, adverse effects were also observed, including an increased carbon-to-nitrogen ratio (19.05) and a decreased germination index (93.4%). Bacterial inoculation was found to preserve the nitrogen content (2.50%) and improve the efficiency of biodegradation. The Salmonella- and Escherichia coli-free final composting products were mature, stable, and ready for soil application. To the authors’ knowledge, no previous research has investigated the compostability of lavender waste. Likewise, this is the first study that has used strains of C. flavigena and S. viridosporus in combination to facilitate a composting process.

Open Access: Yes

DOI: 10.1007/s13205-021-02860-2

Robust reconfigurable control for in-wheel electric vehicles

Timea Fülep Andras Mihaly Zoltán Szabó Peter Gaspar Ferenc Szauter József Bokor

Publication Name: IFAC Papersonline

Publication Date: 2015-09-01

Volume: 28

Issue: 21

Page Range: 36-41

Description:

The paper presents a fault tolerant reconfigurable control method for vehicles driven by four in-wheel electric motors and a steering system. The aim of the design is to realize robust velocity and road trajectory tracking even under challenging driving conditions or actuator failures. The vehicle is operated solely with the in-wheel motors, thus steering intervention is only applied in case of skidding or a failure of an electric motor. The reconfigurable control is realized based on Linear Parameter Varying (LPV) framework, using the specific characteristics of the in-wheel motors of fast and accurate torque control. The operation of the designed control system is demonstrated in a CarSim simulation environment.

Open Access: Yes

DOI: 10.1016/j.ifacol.2015.09.501

Development of individual information technology systems of experimental vehicles

Peter Dely István Lakatos Ernö Horváth Péter Korös

Publication Name: Saci 2015 10th Jubilee IEEE International Symposium on Applied Computational Intelligence and Informatics Proceedings

Publication Date: 2015-08-17

Volume: Unknown

Issue: Unknown

Page Range: 489-493

Description:

Two experimental vehicles were developed during the last two years in the Research Center of Vehicle Industry. The vehicles mentioned above are electrically driven and equipped with own developed computational modules. During development of the computational modules it was an important issue for us to create easily extendable systems which are easy-To-use. Different applications are realized in the two vehicles, consequently, different requirements were set up concerning our applications.

Open Access: Yes

DOI: 10.1109/SACI.2015.7208253

Consumer Consciousness and Motivational Factors in Second-Hand Clothing Purchases: A Systematic Literature Review

Gábor Szábo-Szentgróti Bence Végvári Virág Walter

Publication Name: Decision Making Applications in Management and Engineering

Publication Date: 2025-01-01

Volume: 8

Issue: 1

Page Range: 550-568

Description:

The fást fáshion industry poses significánt environmentál chállenges, which háve driven á growing number of consumers to ádopt more sustáináble shopping hábits. Alongside environmentál concerns, rising consumer prices háve ácceleráted the growth of the second-hánd clothing márket. The study áims to provide á theoreticál foundátion for reseárch on consumer motivátions in the second-hánd clothing márket. By systemáticálly reviewing recent internátionál literáture, the study identifies key fáctors, dimensions, ánd meásurement tools used to understánd consumer behávior in this domáin. A systemátic literáture review wás conducted using árticles from the Scopus ánd Web of Science dátábáses, focusing on publicátions from the lást 10 yeárs. Strict exclusion criteriá were ápplied to ensure the relevánce ánd quálity of the ánályzed works. Purchásing second-hánd clothing reduces wáste, minimizes the demánd for new clothing production, ánd decreáses resource use ánd pollution. Motivátionál fáctors include the "treásure hunting" áspect of second-hánd shopping ánd its environmentál benefits. Businesses cán cápitálize on these motivátions to engáge environmentálly conscious consumers. Businesses should emphásize the treásure-hunting experience of second-hánd shopping álongside the environmentál benefits, which could potentiálly reách the growing sháre of environmentálly conscious consumers. Policymákers should ádopt práctices for sustáináble consumption behávior, such ás second-hánd clothing purcháses with reduced táxátion, encouráging environmentálly friendly consumer behávior.

Open Access: Yes

DOI: 10.31181/dmame8120251435

Chinese and Indian FDI in Hungary and the role of Eastern Opening policy

Eszter Lukács Katalin Völgyi

Publication Name: Asia Europe Journal

Publication Date: 2021-06-01

Volume: 19

Issue: 2

Page Range: 167-187

Description:

The aim of this paper is to assess the main features of Chinese and Indian investments in Hungary and the role of the Hungarian Government’s Eastern Opening policy in the attraction of investments from these two Asian giants. This paper covers the sectoral distribution, modes of market entry, and motivations of Chinese and Indian foreign direct investments. The automotive sector is the most attractive sector for investors from both countries. ICT manufacturing (electronics) and services, and the renewable energy sector are also very attractive for Chinese companies. The same is true for IT/BPO services and the chemical sector in the case of Indian companies. Chinese and Indian companies enter the Hungarian economy mainly through green-field investments or acquisitions. Market-seeking and strategic asset-seeking motives are dominant in the case of investors from both countries. This paper also puts a special emphasis on studying the impacts of Hungary’s Eastern Opening policy (launched in 2012) on Chinese and Indian investments. The findings show that the Eastern Opening policy has had a significant impact on the investment decision (location choice) of new Chinese and Indian investors and further expansion of investments by Chinese and Indian companies located in Hungary due to four factors, namely high-ranking political meetings, strategic cooperation agreements, cash grants from the Hungarian Government and supportive services of HIPA.

Open Access: Yes

DOI: 10.1007/s10308-020-00592-1