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Found 6278 publications

Nonlinear finite element simulation for magnetic flux leakage tester

Miklós Kuczmann Gergely Kovács

Publication Name: Pollack Periodica

Publication Date: 2008-04-01

Volume: 3

Issue: 1

Page Range: 81-90

Description:

The paper reports about the building up a computer controlled measurement system based on National Instruments Data Acquisition card and National Instruments LabVIEW software package. The aim of this research is to detect manufactured surface cracks on steels by applying a magnetic flux leakage testing method. First of all, a finite element method based on the procedure to analyze the behavior has been implemented of the measurement system under construction. One important question is the position of the sensors or of the detecting coils. The finite element procedure contains a two dimensional arrangement. First, eddy currents have been neglected, but the nonlinear characteristic of the specimen has been taken into account by a single valued function. In this paper, the developed measurement system, which is partially ready to work, and the nonlinear finite element procedures are presented as well. © 2008 Akadémiai Kiadó.

Open Access: Yes

DOI: 10.1556/Pollack.3.2008.1.7

Design of 2D rrsst system by FEM with T, φ-φ Potential formulation

Miklós Kuczmann

Publication Name: Pollack Periodica

Publication Date: 2008-04-01

Volume: 3

Issue: 1

Page Range: 67-80

Description:

The paper deals with the numerical analysis of a vector hysteresis measurement system, which is now under construction. The measurement set up consists of an induction motor whose rotor has been removed, and its windings have been replaced to a special two phases one, which can generate a homogeneous magnetic field inside the motor. A round shaped specimen can be inserted into the arrangement. The two orthogonal components of the magnetic field intensity and of the magnetic flux density vectors can be measured by H-coils and B-coils, respectively. The Finite Element Method (FEM) with the T, φ-φ potential formulation has been applied in the simulations. The vector hysteresis property of the specimen has been approximated by the isotropic vector Preisach model, finally the nonlinear problem has been solved by the convergent fixed point technique. The aim of the present work is to focus on the design aspects of this kind of measurement system. © 2008 Akadémiai Kiadó.

Open Access: Yes

DOI: 10.1556/Pollack.3.2008.1.6

After the first lessons and experiences - Cases concerning Hungary before ECJ (2004-2007)

Balázs Horváthy

Publication Name: Acta Juridica Hungarica

Publication Date: 2008-03-01

Volume: 49

Issue: 1

Page Range: 89-110

Description:

The essay attempts to give an overview on the cases relating to Hungary before European Court of Justice in the period between 20042007, which are classified into four categories. The first part of the article analyses eleven procedures concerning petitions for preliminary rulings, illustrating the bearings of the cases and pointing out the importance as well as consequences from the point of view of the Hungarian legal order. The essay refers to the fact that activity of Hungarian courts to apply preliminary ruling procedures is exceptionally high comparing with the other nine Member States acceded to EU in 2004 and in almost each cases concerned, the references were profoundly considered by the Hungarian court. The second category described in this paper includes cases, in which Hungarian individual persons participate as litigants (including the cases before Civil Service Tribunal). The experiences of these procedures on the basis of direct complaints indicate the conclusion that in several cases, the attorneys representing the plaintiff before ECJ involve not enough responsibilities to avoid bringing obviously inadmissible actions. In the third part of the paper the reader can get an insight into the cases in which the Republic of Hungary appears as litigant. Finally the fourth category embraces cases with indirect interest relating Hungary. These are referred but not deeply examined in the article. © 2008 Akadémiai Kiadó.

Open Access: Yes

DOI: 10.1556/AJur.49.2008.1.3

Fourier transform and controlling of flux in scalar hysteresis measurement

Miklós Kuczmann

Publication Name: Physica B Condensed Matter

Publication Date: 2008-02-01

Volume: 403

Issue: 2-3

Page Range: 410-413

Description:

The paper deals with a possible realization of eliminating the effect of noise in scalar hysteresis measurements. The measured signals have been transformed into the frequency domain, and, after applying digital filter, the spectrums of the filtered signals have been transformed back to the time domain. The proposed technique results in an accurate noise-removal algorithm. The paper illustrates a fast controlling algorithm applying the inverse of the actually measured hysteresis loop, and another proportional one to measure distorted flux pattern. By developing the mentioned algorithms, it aims at the controlling of a more complicated phenomena, i.e. measuring the vector hysteresis characteristics. © 2007 Elsevier B.V. All rights reserved.

Open Access: Yes

DOI: 10.1016/j.physb.2007.08.062

Simulation of a vector hysteresis measurement system taking hysteresis into account by the vector Preisach model

Miklós Kuczmann

Publication Name: Physica B Condensed Matter

Publication Date: 2008-02-01

Volume: 403

Issue: 2-3

Page Range: 433-436

Description:

The paper deals with the numerical analysis of a rotational single sheet tester with round-shaped specimen (RRSST) which is now under construction. The measurement setup consists of an induction motor the rotor of which has been removed, and its windings have been replaced to a special two phase one which can generate homogeneous magnetic field inside the motor. The two orthogonal components of the magnetic field intensity and of the magnetic flux density vectors can be measured by H-coils and B-coils, respectively. The Finite Element Method (FEM) with the T, Φ-Φ potential formulation has been applied in the simulations. The vector hysteresis property of the specimen has been approximated by the vector Preisach model. Finally, the nonlinear problem has been solved by the fixed-point technique. The aim of the present work is to focus on the design aspects of this kind of measurement system. © 2007 Elsevier B.V. All rights reserved.

Open Access: Yes

DOI: 10.1016/j.physb.2007.08.068

Model oriented enterprise integration: Metamodel for realizing the integration

Maria Raffai

Publication Name: IFIP International Federation for Information Processing

Publication Date: 2008-01-16

Volume: 255

Issue: Unknown

Page Range: 807-816

Description:

The main task of IT-specialists in the last decades was to develop applications supporting different business functions and processes. For today the enterprises are well equipped with IT-devices and applications, but in most cases they run separately in various business units and/or on different platforms, they work with data stored not only redundant but also in other forms. Consequently there is an urgent need for integrating systems and fulfilling the entrepreneurs', customers', citizens' needs for on-line inter-organizational cooperation. © 2008 International Federation for Information Processing.

Open Access: Yes

DOI: 10.1007/978-0-387-76312-5_1

Organizing the prevention of trachoma in Hungary (1884-1903)

No authors available

Publication Name: Orvostörténeti közlemények

Publication Date: 2008-01-01

Volume: 54

Issue: 1-4

Page Range: 47-68

Description:

In Hungary preventative measures against trachoma began in the winter of 1883-1884. Initially based on the recently issued public health law, it was imbedded in a general prevention programme against various epidemics. Local authorities and municipal boards were made responsible for carrying it out. These authorities and boards were obliged to organize supervision, to establish medical offices and ophthalmological wards and to take charge of the continuity of treatments. The public health department, however, faced serious difficulties, since most of the communities did not have the financial resources for such provision nor did they have enough trained physicians. Since the spread of trachoma could not be stopped by these measures, a new and effective solution had to be found. A new article was created for this purpose, the so called fifth article of the year 1886 "On preventing the spread of trachoma", which placed the burden of expenses for treatment - in case of lack of means - on the state budget. The government set up specialized professional training and the ophthalmological hospital system became specialized and modernised with the establishment of special trachoma hospitals, or--in public hospitals--ophthalmological wards. Although the first preventative measures were taken during the period mentioned above, the disease itself persisted, still occurring in large numbers of cases as late as the end of the Second World War.

Open Access: No

DOI: DOI not available

Challenges and responses in the geo-engineering education

No authors available

Publication Name: Proceedings of the 1st International Conference on Education and Training in Geo-Engineering Sciences: Soil Mechanics, Geotechnical Engineering, Engineering Geology and Rock Mechanics

Publication Date: 2008-01-01

Volume:

Issue:

Page Range: 443-446

Description:

Structural engineers assess the geotechnical problems as difficult to model, complicated to calculate and full of crude approximations. In return, clear constraints hindering the practical use of advanced mechanical theories and computational software decrease the interest of geotechnicians in studying and applying them. In designing complex structures both sides restrict themselves in many cases to the exchange or prescription of some data given on interfaces. The paper presents an overviewon differences either loosing their importance or remaining significant between these structural and geotechnical perspectives. Educational consequences related to the Bologna-process are discussed. Role of case studies and understanding of the observational method's importance are stressed. The paper concludes that geotechnical education should and could correspond to the challenges with more conscious and better structured curricula. © 2008 Taylor & Francis Group, London.

Open Access: No

DOI: DOI not available

Selection of tool materials for cold forming operations using a computerized decision support system

No authors available

Publication Name: Proceedings of the 17th IFHTSE Congress

Publication Date: 2008-01-01

Volume: 2

Issue:

Page Range: 773-775

Description:

A computerized decision support system (DSS) is outlined which is designated primarily to selcct the proper tool steel grades for various cold forming operations. This computerized system contains four data base: data base of cold forming operations and tools, of work materials, of cold forming tool materials and of wear resistant PVD coatings. The decision strategy makes it possible to select appropriate tool materials taking into consideration their most important material properties (wear resistance, toughness, compressive yield strength, tempering resistance, dimensional stability, machinability, and material price). The practical advantages of the developed decision support system are demonstrated on example.

Open Access: No

DOI: DOI not available