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Found 6289 publications

Detection of corrosion resistance of components in cyclic salt spray

Jan Mareček Tamás Ibriksz Vladimír Kročko Štefan Álló

Publication Name: Acta Universitatis Agriculturae Et Silviculturae Mendelianae Brunensis

Publication Date: 2015-01-01

Volume: 63

Issue: 1

Page Range: 9-13

Description:

The aim of this research is, to investigate the influence of two types of cyclic salt spray tests on parts surface treated with galvanizing. On the selected components was performed the method Zn-Ni surface treating on the bath line. Subsequently were the components embedded in the corrosion chamber, where was performed two types of cyclic salt test. In the first test was performed 4 hour salt spray, 8 hours drying, 60 hours condensation and 24 hours drying. Once cycle lasted 96 hours, and it was repeated 4 times. During the second test was performed 2 hours salt spray, 2 hours condensation. The cycle was repeated 4 times, that means 96 hours. After the cycle was performed 72 hours free relaxation in the corrosion chamber, on 20-25 °C temperature. As the research showed, after the cyclic salt spray was no red corrosion on the selected components. The white corrosion appeared only slightly.

Open Access: Yes

DOI: 10.11118/actaun201563010009

A novel pose estimation algorithm for robotic navigation

Claudiu Radu Pozna Peter Foldesi Radu Emil Precup

Publication Name: Robotics and Autonomous Systems

Publication Date: 2015-01-01

Volume: 63

Issue: P1

Page Range: 10-21

Description:

This paper proposes a new pose estimation algorithm in the framework of robotic navigation problems. The algorithm gives the mobile robot (MR) pose on the basis of the difference between the MR desired pose and the MR current pose. In this regard the MR sensor readings and the readings of a virtual sensor are employed. The algorithm is advantageous in comparison with other pose estimation algorithms including those based on classical filter approaches because of the small computation time. Simulation and real-world experimental results are included to illustrate the effectiveness of the pose estimation algorithm and its potential for integration in MR control structures and algorithms.

Open Access: Yes

DOI: 10.1016/j.robot.2014.09.034

Real network test of an iterative origin-destination matrix estimator in urban public transport

Richard Horvath Balázs Horváth

Publication Name: 2014 18th International Conference on System Theory Control and Computing Icstcc 2014

Publication Date: 2014-12-11

Volume: Unknown

Issue: Unknown

Page Range: 715-719

Description:

The estimation of origin-destination matrices in urban public transport is an evergreen issue due to the fact that the key of the planning of public transport systems is the accurate prediction of the traffic load which requires a well-functioning assignment method and reliable passenger data (i.e. time-dependent OD matrix). This paper describes the theory of lately developed iterative estimation method and the first real network test results.

Open Access: Yes

DOI: 10.1109/ICSTCC.2014.6982502

Experimental confirmation of self-regulating turbulence paradigm in two-dimensional spectral condensation

M. Berta L. Bardóczi L. Schmitz A. Bencze

Publication Name: Physical Review E Statistical Nonlinear and Soft Matter Physics

Publication Date: 2014-12-03

Volume: 90

Issue: 6

Page Range: Unknown

Description:

Turbulent transport in magnetic fusion plasmas can be significantly suppressed by Reynolds-stress-induced zonal flows, allowing effective plasma confinement. We present experimental evidence of spatiotemporal correlation between small-scale turbulence-induced Reynolds stress and large-scale zonal flow production in the E×B driven hydrodynamic spectral condensation. We show that Reynolds stress is generated effectively by anisotropic vorticity structures possessing collective tilt angle. The maximum amplitude of the tilt, the Reynolds stress, and the mean zonal flow production coincide with the transition time of the velocity field, indicating a key role of turbulence-induced Reynolds stress in the condensation of the flow. The analysis of the energy transfer between turbulence and zonal flow shows coherent oscillations with π/2 phase delay, thus indicating a predator-prey-like interaction between zonal flow and turbulence.

Open Access: Yes

DOI: 10.1103/PhysRevE.90.063103

The migration trends of highly skilled. Focus on brain waste

Katalin Bándy

Publication Name: Tarsadalomkutatas

Publication Date: 2014-12-01

Volume: 32

Issue: 4

Page Range: 323-335

Description:

After the Hungarian transition, the joining the EU and by the employment agreements among the European countries the west-wards migration brisked up. The high unemployment, the marketable professions and knowledge of languages helped the qualified experts to emigrate for better job and salary or prestige into the western European countries. Researching the Hungarian migrant potential it is verifiable; learnt material/occupancy and knowledge gained in Hungary almost lost as the employees that migrate, do not strive to get a job in accordance with their knowledge but in case they do so, it is without success. The brain waste tendency and underemployment is to be mentioned better, than the brain drain in case of the Hungarian high-skilled (BA, MA) employees obtaining a job abroad. This study is about to reveal the problems of mentioned above and this study is supported by the result of the survey made in the EU-15 among the Hungarian economics graduated migrants, examines the causes and in the focus there are the migrant motivations of the high-skilled young generation after the crisis. The survey's period is 2012-13 and it was carried out in a form of a questionnaire.

Open Access: Yes

DOI: 10.1556/Tarskut.32.2014.4.3

Noise assisted high performance linear inductive distance sensor

Zoltán Pólik Zoltán Kántor

Publication Name: Przeglad Elektrotechniczny

Publication Date: 2014-12-01

Volume: 2014

Issue: 12

Page Range: 123-126

Description:

A temperature compensated linear inductive distance sensor assisted by added noise is demonstrated. The mixed signal processing algorithm performs an effective interpolation over a low-resolution two-dimensional calibration table addressed directly by the digitized noise-affected signals of distance and temperature sensing modules without further arithmetic operations. The table entries are directly passed to the output digital-to-analog converter. The output noise will be cancelled by the intrinsic low-pass behavior of the power output stage. The operation distance, the linearity parameters, as well as the performance of the sensor exceed the standard of the respective industrial products.

Open Access: Yes

DOI: 10.12915/pe.2014.12.29

Distinction of road categories by road users compared to road classification in design guidelines

Gabriella Kosztolanyi-Ivan

Publication Name: Pollack Periodica

Publication Date: 2014-12-01

Volume: 9

Issue: 3

Page Range: 23-34

Description:

On self-explaining roads drivers automatically drive according to the expected behavior and speed. In order to create this type of roads, within a given road category the layout should be homogenous, whereas a remarkable difference should exist between road categories. Using a sample of 500 persons, the paper analyses, which road categories are identified and distinguished by road users. A picture sorting task was completed to find out how road users group 45 different road scenes, and how these groups correspond to the road categories according to current standards. In addition, an analysis of a questionnaire survey was used to determine how individual road scene images are grouped on the basis of chosen speeds, and how this grouping corresponds to road categories. For processing of speed data, cluster analysis was used. The result of both surveys show that road users can clearly distinguish only 4-5 road categories. The paper compares these results with the design guidelines of some countries.

Open Access: Yes

DOI: 10.1556/Pollack.9.2014.3.3

Assessing the requirements of urban traffic calming within the framework of sustainable urban mobility planning

Mattias Juhász

Publication Name: Pollack Periodica

Publication Date: 2014-12-01

Volume: 9

Issue: 3

Page Range: 3-14

Description:

Road traffic calming measures have been gradually spreading in cities since the 1960s. Therefore - in line with a sustainable transport planning approach - the revision and redistribution of urban transport and public surfaces have also come into the spotlight. In this context several traffic calming methods and techniques have evolved from point-based to area-wide interventions. Their positive effects on traffic safety and the environment are indisputable. However, there are serious requirements concerning the application of these instruments, which need to be taken into account to prevent or minimize undesirable side-effects. Despite technical aspects and conditions that are well-known from the international literature, strategic aspects (economic effects and system-level prerequisites of traffic calming) are relatively ambiguous. The aim of this paper is to review the possible measures of road traffic calming, to demonstrate the effect-mechanism and to explore the way towards a consistent policy assessment framework, which can provide information on the strategic requirements of application.

Open Access: Yes

DOI: 10.1556/Pollack.9.2014.3.1

Schur complement method with iterative solver for 2D fieldcircuit coupling finite element problem with movement

Miklós Kuczmann Daniel Marcsa

Publication Name: Przeglad Elektrotechniczny

Publication Date: 2014-12-01

Volume: 2014

Issue: 12

Page Range: 145-148

Description:

The analysis and design of electromechanical devices involve the solution of large sparse linear systems, and require therefore high performance algorithms. In this paper, the Schur complement method with parallel preconditioned conjugate gradient (PCG) solver is introduced in two-dimensional parallel time-stepping finite element formulation to analyse rotating machine considering the electromagnetic field, external circuit and rotor movement. The proposed parallel solver is analysed concerning its computational efficiency and number of iterations. Simulation results of a rotating machine are also presented.

Open Access: Yes

DOI: 10.12915/pe.2014.12.35