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Found 6374 publications

Reinforcing and compatibilizing effect of nano size montmorillonite on high density polyethylene - Polyamide 6 composites

No authors available

Publication Name: ICCM International Conferences on Composite Materials

Publication Date: 2013-01-01

Volume: 2013-July

Issue:

Page Range: 8162-8169

Description:

Open Access: No

DOI: DOI not available

Territorial Research in Central Europe – Report on the 2019 Conferences of the Hungarian Regional Science Association

Szilárd Rácz Ildikó Egyed

Publication Name: Deturope

Publication Date: 2020-01-01

Volume: 12

Issue: 3

Page Range: 7-12

Description:

No description provided

Open Access: Yes

DOI: 10.32725/det.2020.019

The Environmental Sustainability Potential of Autonomous Vehicles: An Overview

H. Szűcs Jozefin Szűcs

Publication Name: Periodica Polytechnica Transportation Engineering

Publication Date: 2024-01-01

Volume: 52

Issue: 3

Page Range: 246-256

Description:

The optimization of transportation systems and the integration of autonomous vehicles (AV) are significantly transforming urban mobility and exerting outstanding effects from an environmental perspective. This article examines the possibilities of autonomous vehicles in reducing traffic congestion, emissions, and energy consumption. The optimized driving style of AVs, dynamic route planning, and enhanced intersection systems have a profound impact on emission reduction. The article also delves into current development trends and challenges, encompassing advancements in AV sensing technologies, traffic safety, and cybersecurity. These findings collectively suggest that the deployment of autonomous vehicles brings substantial benefits to sustainable urban mobility; however, further development is necessary to support the widespread adoption of AVs and strengthen societal trust.

Open Access: Yes

DOI: 10.3311/pptr.23933

Case Study: Optimizing Grading Ring Design for High Voltage Polymeric Insulators in Power Transmission Systems for Enhanced Electric Field and Voltage Distribution by Using a Finite Element Method

Fatiha Aouabed Adrienn Dineva Esraa Aziz Hossam Abdellah

Publication Name: Energies

Publication Date: 2023-07-01

Volume: 16

Issue: 13

Page Range: Unknown

Description:

This research paper aims to investigate the optimal design of grading rings for high-voltage polymeric insulators in an actual power transmission system, with a focus on improving the electrical representation of the insulator strings. One such subsidiary accessory commonly used with porcelain and polymer insulator strings is the grading ring, which is employed to improve the electric field and voltage distribution surrounding the insulator string. The efficiency of insulator strings can be enhanced by grading rings, as they facilitate a more linear potential division along the strings. The design parameters of grading rings significantly influence their performance on insulator strings. In this study, we examine the optimal design of the grading rings of high-voltage polymer insulators, since no uniform design methodology has been developed for high-voltage polymer insulators, and their optimization is currently the subject of many research studies. The electric field on an outdoor polymeric insulator is examined using finite element method (FEM) software and COMSOL Multi-Physics program. A 2D model is utilized to simulate a 220 kV polymeric insulator. The effectiveness of high-voltage polymeric insulators greatly depends on the dimensions and locations of the grading rings. Therefore, the impacts of the radius of the grading ring and that of its tube and the tube’s vertical position are thoroughly investigated, under dry and humid conditions. To achieve this objective, a search algorithm is employed to adjust the dimensions and locations of the grading ring. The optimization approach in this study is based on determining the maximum electric field across the insulator surface, while ensuring that it remains below the corona initiation level.

Open Access: Yes

DOI: 10.3390/en16135235

Role of land use, green energy, and water resources for food accessibility: Evidence from emerging economies in the lens of COP28

Laszlo Vasa Shouhong Xie Waqas Amin Urszula Mentel

Publication Name: Land Degradation and Development

Publication Date: 2024-09-01

Volume: 35

Issue: 15

Page Range: 4607-4622

Description:

In the era of COP28, where most of the developed and developing economies concentrate more on the development of environmentally friendly energy resources to tackle the issue of climate change. Nevertheless, the literature lacks appropriate evidence regarding the influences of green energy and other resources on food security. This study analyses the influences of land use, green energy, and water resources on food accessibility in emerging economies, while also considering the important roles of natural resources, research and development (R&D) expenditure, and economic growth during 1980–2020. Due to non-linear data dispersion, the novel moments quantile regression is employed. Results assert that land use has a positive significant influence on food accessibility in the presence of water resources and a weaker negative impact in the presence of natural resources. Natural and water resources are detrimental to food accessibility in the Emerging Seven (E7) countries. Furthermore, R&D expenditure and green energy positively (negatively), while economic growth negatively (positively) impacted food accessibility in the presence of natural resources (water resources). The results are robust and validate causal inferences that help develop appropriate policies for emerging economies concerning food accessibility or security. In this rapidly evolving era, most empirical studies consider environmental quality. Conversely, this study contributes to the literature by examining the factors influencing food accessibility, as this issue is of considerable importance because of the rapidly growing global population.

Open Access: Yes

DOI: 10.1002/ldr.5244

Influence of weediness on sugar beet yields

Péter Bosák Katalin Lajos

Publication Name: Novenytermeles

Publication Date: 1999-12-01

Volume: 48

Issue: 6

Page Range: 617-629

Description:

The influence of weeds on yield and quality were studied in sugar beet stands kept mechanically weedless for different periods in small-plot. Plots which were weeded early in the season (1st May or 15th May) and were kept clean to the end of the growing period (30th September) gave significantly higher and better quality yield than plots where weed killing started later (1st June) or where the weeds were allowed to reappear after 15th May or 1st June. Trials proved that weed control in sugar beet has to be started early and that the stand has to be kept weedless to the end of the growing period. The late spread of weeds is an important yield-reducing factor.

Open Access: Yes

DOI: DOI not available

Finite element analysis of bridge transition zone for investigating the effect of moving loads

Edina Koch

Publication Name: 17th European Conference on Soil Mechanics and Geotechnical Engineering Ecsmge 2019 Proceedings

Publication Date: 2019-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

The problem of track-bridge interaction and its modeling issues have increasingly been emphasized and highlighted due to the presence of high-speed rails. The quality criteria for high-speed rail lines must be stricter than those for conventional rail lines to assure passenger comfort and safety. Experience shows that in transition zones when a train rides from an embankment onto a stiff structure, such as a bridge, tunnel or culvert, an abrupt change occurs in the support stiffness possibly inducing differential settlements. Examples prove that inadequate technical solutions can generate damage that may require long term speed restrictions or lead to short maintenance cycles, significantly increasing the total cost of ownership. The problems associated with the transition zones require complex analysis. The author reports the results obtained by the investigation of a 3D numerical model of a bridge transition zone by means of an advanced constitutive model and time domain analysis. The mechanical behavior of a railway bridge and its soil environment is presented in the study with special regards to factors like train speed, embankment height and the settlement differences apparently developing in the transition zone.

Open Access: Yes

DOI: 10.32075/17ECSMGE-2019-0137

Benefits of lethal pandemics: Direct impact of contagious diseases on public administration in Hungary (1867-1914)

No authors available

Publication Name: AMHA - Acta Medico-Historica Adriatica

Publication Date: 2013-02-01

Volume: 11

Issue: 2

Page Range: 213-222

Description:

The reconciliation of 1867 between Austria and Hungary brought great changes to Hungarian public administration: the way towards the building up of a modern public administration had been opened. Although there was a functioning public health system and a related legislation from the late 18th century, major issues - such as balanced geographical distribution of medical personnel, fair access to medical services even in the poorer regions of the country, and the effective protection against some contagious diseases - were not resolved for decades. During the reform work of public administration since the 1870s, the lawmakers touched repeatedly the framework and functioning of the public health as well. Although the general conditions of the domain depended traditionally on the municipalities and counties due to the national importance of the matter, the government made efforts to make the functioning of the public health more efficient through centralisation. The contagious diseases continuously endangered the population, revealing the weak points in the existing public health system, thereby giving a momentum to the reforms and helping the government in its organization of prevention and clearly contributing to the legislation work.

Open Access: No

DOI: DOI not available

Drivers of Regional Competitiveness in the Central European Countries

János Rechnitzer Imre Lengyel

Publication Name: Transition Studies Review

Publication Date: 2013-11-01

Volume: 20

Issue: 3

Page Range: 421-435

Description:

The examination of regional competitiveness has become a research question of outstanding importance in the Central European post-socialist countries since joining the EU. In our study we will proceed to analyse the competitiveness of 93 NUTS2 level regions of 8 Central European countries with the help of an empirical data base, using multivariable statistical methods. After introducing the database, we are going to investigate into the common revealed competitiveness indicator. Not only revealed competitiveness categories shall be analysed with the help of multivariable statistical procedures, but also the background processes described by the factor analysis and the multivariable linear regression model. © 2013 CEEUN.

Open Access: Yes

DOI: 10.1007/s11300-013-0294-2