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Found 6289 publications

Evaluation of trace metal levels in surface water and sediments of the Hungarian upper section of the Danube River and its tributaries

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: 2016-12-05

Volume: 51

Issue: 14

Page Range: 1248-1261

Description:

The objective of this study was to assess the concentration levels of trace metals (Zn, Hg, Cd, Cr, Ni, Pb and Cu) in surface water and bottom sediments of the Hungarian upper section of the Danube River and its main tributaries. A total of 935 samples (water and sediments) were collected from 10 different sampling sites in the period of 2001–2012 and analyzed for the trace metals. Moreover, the dissolved arsenic content was determined in a number of 467 water samples in the period of 2004–2012. The highest dissolved trace element concentrations were observed at the site of Kenyérmezei-patak Creek located near a hazardous waste incinerator. However, the comparison of the dissolved trace metal(loid) concentrations determined with other sections of the Danube River and the European Union environmental quality standards revealed that the dissolved trace metal(loid) concentrations were relatively low in the Hungarian upper section during the 12-year study period (excluding some samples for Hg, Cd and Cr). The concentrations of trace metals in sediments were higher than those found in water samples and varied very much in all sampling sites during the study period. The sediment samples were mainly classified as low or moderate polluted for trace metals. However, some sediment samples collected especially from the Moson Danube branch indicated a considerable (for Zn, Hg, Cd, Ni and Cu) or a very high (for Zn and Hg) contamination.

Open Access: Yes

DOI: 10.1080/10934529.2016.1212565

Weed species composition of conventional soyabean crops in Hungary is determined by environmental, cultural, weed management and site variables

B. Czúcz P. Karácsony Gyula Pinke K. Blazsek K. Nagy L. Magyar Z. Botta-Dukát

Publication Name: Weed Research

Publication Date: 2016-12-01

Volume: 56

Issue: 6

Page Range: 470-481

Description:

The goal of this study was to identify factors determining weed species composition in soyabean crops in Hungary, where its expanding production faces difficult weed problems. The abundance of weed flora was measured in 262 fields across the country, along with 38 background variables. Using a minimal adequate model containing 24 terms with significant net effects, 21.6% of the total variation in weed species data could be explained. Plot location (edge vs core position, the single site variable in our analysis) was found to be the most important explanatory variable that was followed by a set of environmental (temperature, precipitation, altitude, soil texture, pH, Ca, K, Na and humus content), cultural (cultivar maturity, organic manure, fertiliser P and N, row spacing) and weed management (flumioxazin, pendimethalin, dimethenamid, propaquizafop, bentazone, quizalofop-p-ethyl, quizalofop-p-tefuril, linuron, thifensulfuron) factors. Variation partitioning revealed that environmental variables accounted for about four times more variance than cultural and about two and half times more than weed management variables. Chenopodium album, Ambrosia artemisiifolia, Hibiscus trionum, Echinochloa crus-galli and Convolvulus arvensis were the most dominant and frequent weeds, but their abundance was influenced by different factors. The responses of weed species to the studied variables provide new information about their ecological behaviour, and our findings also can be used to develop better weed management strategies.

Open Access: Yes

DOI: 10.1111/wre.12225

Predictive equations for soil shear-wave velocities of Hungarian soils based on MASW and CPT measurements around Győr

P. Tildy O. Kegyes-Brassai Richard P. Ray

Publication Name: Acta Geodaetica Et Geophysica

Publication Date: 2016-12-01

Volume: 51

Issue: 4

Page Range: 685-707

Description:

Determination of shear-wave (S-wave) velocity profiles is the first step in seismic hazard assessment of a town, because the dynamic parameters of local soil types are vital for seismic response analysis of a specific area in order to determine the local soil effect in a case of a seismic event for seismic risk analysis. S-wave velocity profiles have been determined for many areas within Győr. Extensive use of historical boring logs allowed for correlations and reasonable extrapolation of soil performance throughout the area. This has led to a pattern of soil layer distributions and delineates several different soil zones for Győr.

Open Access: Yes

DOI: 10.1007/s40328-015-0148-y

Supply Chain Decisions in Governmental Organizations

Gyu M. Lee Gyula Vastag Geraldo Ferrer

Publication Name: Decision Sciences

Publication Date: 2016-12-01

Volume: 47

Issue: 6

Page Range: 995-997

Description:

No description provided

Open Access: Yes

DOI: 10.1111/deci.12263

Finite element analysis of switched reluctance motor with rotor position based control

Miklós Kuczmann Daniel Marcsa

Publication Name: Pollack Periodica

Publication Date: 2016-12-01

Volume: 11

Issue: 3

Page Range: 153-164

Description:

This research presents a field-circuit coupled parallel finite element model of a switched reluctance motor embedded in a simple closed loop control system. The parallel numerical model is based on the Schur-complement method coupled with an iterative solver. The used control system is the rotor position based control, which is applied to the FEM model. The results and parallel performance of the voltage driven finite element model are compared with the results from the current driven model. Moreover, the results of the start-up of the loaded motor show why the model accuracy is important in the control loop.

Open Access: Yes

DOI: 10.1556/606.2016.11.3.14

Potential impacts of transatlantic trade negotiations on the eu environmental policy

Balázs Horváthy

Publication Name: Acta Juridica Hungarica

Publication Date: 2016-12-01

Volume: 57

Issue: 4

Page Range: 401-415

Description:

The current EU-US negotiations on the Transatlantic Trade and Investment Partnership (TTIP) may result in a comprehensive agreement which will be able to shape not only the traditional trade agenda but will cover a set of non-trade matters as well. Specifically, the environmental impacts as a matter of public concern are at the centre of attention of both the academia and the civil society. The proposed paper intends to analyse two aspects of the likely implications which could be triggered by the future transatlantic agreement. First, the policy level of the analysis is focusing on the question of how the contracting parties will integrate the environmental concerns into the agreement and how these concerns could be reconciled with the standard trade concerns and principles. Second, the TTIP could also have a direct impact on the environmental regulation; for this reason, the paper will also focus on the regulatory level. The paper concludes that a carefully planned agreement will not constrain the policy leeway of the EU in the field of the environmental protection, however, the EU negotiators have to pay very close attention to choosing the right models, methods and formulations in the future text of the agreement.

Open Access: Yes

DOI: 10.1556/2052.2016.57.4.1

Performance analysis and comparison of four DNS64 implementations under different free operating systems

Sándor Répás Gábor Lencse

Publication Name: Telecommunication Systems

Publication Date: 2016-12-01

Volume: 63

Issue: 4

Page Range: 557-577

Description:

The depletion of the global IPv4 address pool made the deployment of IPv6, the new version of the Internet Protocol, inevitable. In this paper, the transition mechanisms for the first phase of IPv6 deployment are surveyed and the DNS64 plus NAT64 solution is found appropriate. The most important free and open source DNS64 implementations are selected: BIND, TOTD, Unbound and PowerDNS. The test environment and the testing method are described. The first three of the selected DNS64 implementations are tested under Linux, OpenBSD and FreeBSD whereas PowerDNS is tested only under Linux. Their performance characteristics (response time, number of answered requests per second, CPU and memory consumption) are measured and compared. The effect of the hardware architecture of the test computer is also examined by using single-core, dual-core and quad-core test computers. The stability of all the tested DNS64 solutions are analyzed under overload conditions to test if they may be used in production environments with strong response time requirements. Our measurement results show significant differences in the performance of the tested DNS64 implementations, e.g. Unbound served four times more requests per second than PowerDNS (when executed by a single-core CPU under Linux and load was generated by eight clients). However, no absolute order can be determined, because it is influenced by different factors such as the architecture of the hardware, especially the number of cores, because BIND and PowerDNS are multithreaded (therefore they can profit from the multiple cores) but TOTD and Unbound are not. Also the operating system of the DNS64 server has significant influence on the performance of the DNS64 implementations under certain conditions. All the details of our measurements are disclosed and all the results are presented in the paper. An easy-to-use implementation selection guide is also provided as a short summary of our high number of results.

Open Access: Yes

DOI: 10.1007/s11235-016-0142-x

The impact of the hotel industry on the competitiveness of tourism destinations in Hungary

Albert Tóth Attila

Publication Name: Journal of Competitiveness

Publication Date: 2016-12-01

Volume: 8

Issue: 4

Page Range: 85-104

Description:

This paper focuses on a complex question from the perspective of the hotel industry. It tries to draw attention to the importance of hotels, enhancing it on the basis of the tourism destination competitiveness models and introducing the role and place of the hotel industry in the most important models. The hotel industry research evaluates the most important tourism destinations of Hungary on the micro-regional level that justifies the importance and contribution of the hotels and accommodations to competitiveness and success of tourism destinations with exact results. As a result of the research, the micro-regional destinations can be ranged within three groups in Hungary. In the first group of the most developed and most competitive tourism destinations, the hotel industry plays a very important role. In these regions, the hotel industry has a significant effect not only on competitiveness of tourism but also on general development of the regions. In the second group, which can be still called tourism destination, tourism and the hotel industry both play a significant role, but only the competitiveness of tourism can be considered good, the effects of the tourism on general development of the region can be proved only to a lesser extent. In the third group, the effects of tourism and the hotel industry can only be experienced to a lesser extent. The majority of these regions are not considered to be attractive tourism destinations for tourists any more.

Open Access: Yes

DOI: 10.7441/joc.2016.04.06

Model-Based development of induction motor control algorithms with modular architecture

Krisztian Horvath Marton Kuslits

Publication Name: Proceedings 2016 IEEE International Power Electronics and Motion Control Conference Pemc 2016

Publication Date: 2016-11-21

Volume: Unknown

Issue: Unknown

Page Range: 133-138

Description:

Development of control algorithms for electrical machines may be a difficult procedure if functional safety, software quality, reusability and expandability come into scope. These properties might be required in both of research and industrial development projects. State of the art methods and tools like model-based design (MBD) and automated code generation may help to meet these requirements. In this paper, MBD methods and a modular, reusable model architecture are presented for implementation of field oriented control (FOC)-based controller software for induction motors.

Open Access: Yes

DOI: 10.1109/EPEPEMC.2016.7751987