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Found 6412 publications

The lithium polymer battery swelling test with high-precision displacement sensors

István Lakatos Szabolcs Kocsis Szurke

Publication Name: 2018 20th International Symposium on Electrical Apparatus and Technologies Siela 2018 Proceedings

Publication Date: 2018-08-24

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

The inappropriate charge-discharge of lithium polymer batteries or the high number of cycles (degradation) can lead to volume expansion. The principal motivation is to precisely determine the beginning and the causes of this expansion. During the research one of the objectives is to create a measurement system which can sample the deformation occurring in the course of charge and discharge. The other main aim is to process the measured results and to detect the conditions which critically influence the lifespan of the battery.

Open Access: Yes

DOI: 10.1109/SIELA.2018.8447119

Environmental activities of agricultural enterprises: Accounting and analytical support

Laszlo Vasa Nataliya Zdyrko Inna Lepetan Olesya Tomchuk

Publication Name: Economic Annals Xxi

Publication Date: 2018-07-19

Volume: 169

Issue: 1-2

Page Range: 77-83

Description:

The article outlines the causes of the ecological crisis in Ukraine and various factors affecting the natural environment, such as air pollution, depletion and degradation of land resources, exhaustion of forest and water resources, caused by agricultural production. Thus, in Ukraine, as of 1 January 2018, more than 1.1 million hectares of degraded, unproductive and technogenically contaminated lands counted to expand, and there were 315.6 thousand hectares of unproductive lands that needed improvement; 57% of the territory of the country was affected by wind and water erosion, about 12% were flooded lands and 20% more - polluted lands. The authors detail the consequences of the impact of agricultural activities on the environment. It is necessary to reflect environmental activities in accounting, including environmental assets (natural resource potential, production waste, non-current assets of environmental protection purposes), liabilities (environmental liabilities) and results of activities (environmental incomes, environmental expenses, financial results from environmental activities). The components of natural resource potential, which are to be reflected in the accounting system, are determined. The authors of the research provide an analytical estimation of the state, structure and changes of land resources in Ukraine and define the degree of compatibility between the modern system of agriculture and new environmental and technological requirements. The article discusses normative and legal provisions concerning land protection in Ukraine, as well as normative legal acts on ecologisation of agriculture. The tendency of the recent years shows that the mechanism of combining measures of financial incentives and legal responsibility in the field of land protection, as well as the establishment of legally determined environmental restrictions in land use by means of land management, remains insufficient in terms of optimising the use and protection of land in Ukraine. The study covers the main problem aspects of the land use in Ukraine. Analytical data describing the anti-desertification measures planned until 2030, as well as measures for the restoration of degraded lands and soils, including lands affected by desertification, droughts and floods, are presented. The need to reflect the costs of implementing measures to protect and restore the natural resource potential (including land resources) is emphasised. The authors generalise the information on three groups of accounting objects in terms of the use of agricultural land: objects affecting the qualitative condition (natural fertility) of land, objects representing land capital with a certain level of natural fertility which are at the disposal of enterprises, and objects that depend on the type of agricultural lands and their natural fertility. It is suggested to generalise the information on the objects of ecological accounting in the form of the Environmental Activity Report, which will increase the effectiveness of the managerial decisions on the environment at micro- and macro-levels.

Open Access: Yes

DOI: 10.21003/ea.V169-15

Automotive Application of Chemically Foamed rPET

András Kovács V. A. Szabó Sándor K. Jakab Tamara Zsuzsanna Böcz Gabor Dogossy

Publication Name: Polymers

Publication Date: 2025-05-01

Volume: 17

Issue: 9

Page Range: Unknown

Description:

This study investigated the automotive applicability of parts produced from a newly developed foamed recycled polyethylene terephthalate (rPET). The injection molded part contained a combination of both endothermic and exothermic foaming agents and phosphorus (Exolit OP 1240) (OP)- and melamine polyphosphate (MPP)-based flame retardant agents. The parts were produced using a breathing mold technique to achieve a suitable level of foaming. The aim was to produce lighter parts made of recycled material that also complied with the fire safety automotive industry standards. Computer tomographic scans revealed the foam structure formed successfully, which contributed to an improved strength-to-weight ratio. The scans further showcased that larger cells tended to form in the thicker areas within the part, while smaller cells generally formed in the thinner areas. Finite element simulations showed that the large cell formation in the thicker parts had no effect on the part’s load bearing property, and there were not stress concentration points after the boundary conditions were defined. The sample produced from the material was determined to be a possible replacement of small-sized automotive components.

Open Access: Yes

DOI: 10.3390/polym17091251

Research on Risk Control Parameters of a Shielded-Tunnel-enlarged Station, based on Bearing Capacity of Pre-removed Segment

Weining Liu Zhiyong Peng Xiuren Yang Majid Movahedi Rad

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2023-01-01

Volume: 20

Issue: 1

Page Range: 213-229

Description:

A pre-removed segment is a new structure segment applicable to enlarging shield tunnel technology. It can facilitate the removal of the excess partitioned segment, for an enlarged station, by shield tunnel, however, it may cause certain risk of enlarged excavation construction, when a certain construction control limit is exceeded. To study the risk control problem for the removed segment, applicable to the shielded-tunnel-enlarged station, a risk control method, based on the load critical curve of the pre-removed segment is proposed. In this paper, a three-dimensional stratum structure model of the shielded-tunnel-enlarged station is established and variations of forces on the interface of the pre-removed segment are analyzed, under the influences of buried depth and staggered distance, for different enlarged excavation construction stages, as well as different soil properties (elasticity modulus). Combined with the load critical curve of the contact surface concerning the pre-removed segment obtained from the test, the critical construction control surface of buried depth and staggered distance, was obtained to ensure the bearing capacity of the pre-removed segment in different soil properties and in all of the involved enlarged excavation stages. It provides the technical guidance and reference for the construction risk control of the application of pre-removed segment in the shielded-tunnel-enlarged station.

Open Access: Yes

DOI: 10.12700/APH.20.1.2023.20.15

Plasma edge current fluctuation measurements during the ELM cycle with the atomic beam probe at COMPASS

M. Berta G. Anda D. Dunai P. Háček D. Refy M. Aradi J. Krbec S. Zoletnik A. Bencze

Publication Name: 46th Eps Conference on Plasma Physics Eps 2019

Publication Date: 2019-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

No description provided

Open Access: Yes

DOI: DOI not available

Sustainable city tourism—A systematic analysis of Budapest and Mumbai

Arnold Tóth Judit Grotte Botond Géza Kálmán Szilvia Módosné Szalai Szilárd Malatyinszki Zsuzsanna Zugor Vasantha Lakshmi

Publication Name: Journal of Infrastructure Policy and Development

Publication Date: 2024-01-01

Volume: 8

Issue: 9

Page Range: Unknown

Description:

International Tourist arrivals, guest nights and their contribution to GDP are key indicators reflecting a country’s actual perception. A growing percentage of tourists prioritize environmental awareness across tourism products and services each year. Dest inations aiming to meet the expectations of eco conscious travellers must center sustainability in their branding strategies. This approach aligns with UNWTO (World Tourism Organization of United Nations) Agenda 2030 of sustainable tourism development. This paper examines various dimensions of sustainability in tourism, focusing on Mumbai and Budapest. Using specific sustainability indicators, it employs sustainability city index to compare international tourism in these cities, which face distinct environmental and infrastructural challenges. By using specific sustainability indicators such as: (1) Carbon Emissions: Measurement of the total greenhouse gases produced by the city. (2) Proportion of Green Public Spaces: Evaluation of the percentage of urban areas dedicated to parks and natural spaces. (3) State of Infrastructure: Assessment of the quality and sustainability of urban infrastructure, including transportation systems. (4) Water Usage: Analysis of the amount of water consumed by the city and its conservation practices. (5) Waste Management: Review of the city’s effectiveness in managing and recycling waste. (6) Air Pollution: Monitoring of the levels of pollutants in the air to assess environmental health. This research provides a comprehensive view of how cities can attract environmentally conscious tourists. The findings offer guidance for policy makers and tourism professionals to align strategies with sustainable development goals. This detailed assessment highlights each city’s commitment to sustainability and delivers actionable insights for improving tourism strategies in accordance with global standards. While valuable for tourism professionals, it is important to note that this research covers only six SCI factors, with incomplete data for studied countries. The practical and social implications indicate areas needing improvement to enhance tourist appeal, beneficial for industry professionals and educational purposes. This comparative analysis aids in promoting sustainable tourism and can guide governments in achieving sustainability goals with raising awareness of environmental quality and conscious living.

Open Access: Yes

DOI: 10.24294/jipd.v8i9.7933

Investigation of Modern Technologies for Reducing Carbon Dioxide Emissions in Railway Networks

Edina Koch Zoltán Major Szigeti Cecília Róbert Horváth

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2026-01-01

Volume: 23

Issue: 1

Page Range: 163-179

Description:

The revenues for railway infrastructure managers, are proportional to the volume of passenger and freight traffic, on the railway lines, supplemented by other revenues and subsidies. To maximize their revenues in a changing economic environment (where there is a tendency for the state to withdraw from funding), it is important to have and operate an infrastructure with sufficient capacity. In the event of inadequate track conditions, they will not only face a loss of revenue from network charges, but also additional penalty costs. One of the key elements in achieving stable, good track conditions, is to ensure that the substructure conditions, are adequate. In practice, the use of large-scale mechanized formation rehabilitation is becoming increasingly common, ensuring a sufficiently fast job and consistent quality. Another advantage of this technology is that it allows 100% of the logistical tasks of renewal, to be carried out on the railway track and reduces the amount of new raw materials to be installed. In this article, we present the application possibilities of large-scale mechanized formation rehabilitation and highlight the savings, in newly installed raw materials. The new materials have a high installed CO2 emission, thus, significantly increasing the ecological footprint of infrastructure development. The study aims to develop the methodology for reducing the ecological footprint, for the improvement of the railway network.

Open Access: Yes

DOI: DOI not available

Bifurcations and Application of the Vallis - Model

Antal Joos Bálint Nagy Eniko Nagy Gyorgy Molnar

Publication Name: Iccc 2024 IEEE 11th International Conference on Computational Cybernetics and Cyber Medical Systems Proceedings

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 55-60

Description:

Investigating chaotic systems is a fertile field considering that chaos is an exotic chapter in the theory of differential equations, and it has useful applications in the theory of communications. In this work a well-known chaotic system is investigated from the bifurcation point of view and some applications are also introduced. The data studied are also visualized for better clarity. The results observed can be helpful in the encryption methods of the implementation of different communication channels.

Open Access: Yes

DOI: 10.1109/ICCC62278.2024.10583106

Interfacial bond strength of coloured SCC repair layers: an experimental and optimisation study

Amin Ghodousian Oveys Ghodousian Vahid Shafaie Reyes Garcia

Publication Name: Journal of Structural Integrity and Maintenance

Publication Date: 2023-01-01

Volume: 8

Issue: 3

Page Range: 140-149

Description:

This study investigates experimentally and analytically the interfacial bond strength of coloured SCC repair layers. Ten SCC mixes with 5%, 10% and 15% of blue, green or red pigments were produced to examine their fresh properties. Subsequently, 60 coloured SCC specimens were tested to assess interfacial bond strength using pull-off and push-out tests. The results confirm that pigments reduce the mechanical properties of SCC and its bond strength to concrete substrates, with red pigment reducing (by up to 41%) interfacial bond strength. It is shown that the push-out test is effective to determine the interfacial shear bond strength between the SCC repair layers and substrates. A GNNC-Modified PSO algorithm is proposed to calculate accurately (R2 = 0.95) the interfacial bond strength of coloured SCC repair layers. This study contributes towards developing more effective test methods and more accurate models to calculate interfacial bond strength of the SCC repair layers used in this study.

Open Access: Yes

DOI: 10.1080/24705314.2023.2170620