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Found 5164 publications

Occurrences of Nanocyperion species in West Hungary - Role of moist plough-lands in conservation

A. Mesterházy G. Király R. Pál A. Király Gy Pinke

Publication Name: Journal of Plant Diseases and Proctection Supplement

Publication Date: 2008-04-28

Volume: Unknown

Issue: 21

Page Range: 413-417

Description:

In the last decades in Hungary biotopes of Nanocyperion species have been reduced significantly according to the melioration and the declining of pasturing. Owing to the habitat loss more species such as the examined Lindernia procumbens, Eleocharis ovata, Centunculus minimus, Limosella aquatica, Juncus sphaerocarpus and Elatine triandra became endangered all over the country. During the researches site requirements of these species were analysed as well as their connection with the cultivated species and the soil cultivation carried out on the plough-lands. According to our experiences in West Hungary actual occurrences of Lindernia procumbens, Centunculus minimus, Juncus sphaerocarpus and Elatine triandra are related strongly to the plough-lands. Eleocharis ovata and Limosella aquatica occur on plough-lands less frequently, exist mainly on other pioneer moist habitats. It can be established in case of all the 6 examined species that their habitat spectrum has extended by the increasing in the territory of ploughs forming spacious convenient biotopes for these species. © Eugen Ulmer KG.

Open Access: Yes

DOI: DOI not available

Occurrences of Nanocyperion species in West Hungary - Role of moist plough-lands in conservation

No authors available

Publication Name: Journal of Plant Diseases and Proctection, Supplement

Publication Date: 2008-04-28

Volume:

Issue: 21

Page Range: 413-417

Description:

In the last decades in Hungary biotopes of Nanocyperion species have been reduced significantly according to the melioration and the declining of pasturing. Owing to the habitat loss more species such as the examined Lindernia procumbens, Eleocharis ovata, Centunculus minimus, Limosella aquatica, Juncus sphaerocarpus and Elatine triandra became endangered all over the country. During the researches site requirements of these species were analysed as well as their connection with the cultivated species and the soil cultivation carried out on the plough-lands. According to our experiences in West Hungary actual occurrences of Lindernia procumbens, Centunculus minimus, Juncus sphaerocarpus and Elatine triandra are related strongly to the plough-lands. Eleocharis ovata and Limosella aquatica occur on plough-lands less frequently, exist mainly on other pioneer moist habitats. It can be established in case of all the 6 examined species that their habitat spectrum has extended by the increasing in the territory of ploughs forming spacious convenient biotopes for these species. © Eugen Ulmer KG.

Open Access: No

DOI: DOI not available

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

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

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

Measuring and control the hysteresis loop by using analog and digital integrators

Miklós Kuczmann Zoltán Pólik

Publication Name: Journal of Optoelectronics and Advanced Materials

Publication Date: 2008-01-01

Volume: 10

Issue: 7

Page Range: 1861-1865

Description:

We have managed to build up a computer controlled measurement system applying National Instruments Data Acquisiton card and National lnsturments LabVIEW software package. First, in a previous study, the specimen under test has been simulated by the Jiles-Atherton model of hysteresis, but simulated measurements have been performed using LabVIEW functions. Our main goal now is to control the magnetic flux density measured by using a toroidal shape core with a feedback controller. In this paper, we show the developed procedure which is able to measure the hysteresis characteristics applying analog and digital integrators, and to control the waveform of magnetic flux density determined from the induced voltage of the secondary coil wound on the toroidal shape core. Our experience is that the developed controller is robust. This work is an initial step of the vector hysteresis measurement system.

Open Access: Yes

DOI: DOI not available