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Tytuł:
Detection of ferromagnetic objects in local magnetic anomaly of the Baaltic Sea
Autorzy:
Wołoszyn, M.
Powiązania:
https://bibliotekanauki.pl/articles/258930.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
geological researches
gravity
electromagnetic
magnetic methods
Opis:
In geological researches several kinds of methods are applied to discovering the natural resources. Planes, helicopters and UAVs (UnmAnned Vehicle) are used in researches in large areas. The gravity, electromagnetic and magnetic methods, which are used in geological researches, are presented in this paper. The special attention was paid to magnetic systems installed on mobile platforms. The magnetic field of the Earth obtained from mathematical model was compared to the real magnetic field in the selected part of the Baltic Sea. The results of the calculations showed that the mathematical model of the Earth’s magnetic field does not consider local magnetic anomalies. The strong local magnetic anomalies cause serious problems with detection of underwater objects. Special problems appear in the magnetic system on a helicopter, which are presented in this paper.
Źródło:
Polish Maritime Research; 2008, 2; 77-82
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using SMATH software for the analysis of steady states in electric circuits
Autorzy:
Wołoszyn, M.
Wołoszyn, J.
Powiązania:
https://bibliotekanauki.pl/articles/97317.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electric circuits
computer
SMATH software
Opis:
This paper presents software that can be used for educational purposes – teaching students to perform the analysis of electric circuits [1]. Programmes created in the SMATH system [2] make it possible to solve exercises on electric circuits and constitute an interesting tool supporting the teaching process. The fact that the students can form their own electric circuit structures, with a preview of the equations and the solutions of these calculations, offers to them an interesting learning alternative.
Źródło:
Computer Applications in Electrical Engineering; 2016, 14; 66-76
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of ferromagnetic objects by using scalar magnetometers
Autorzy:
Jakubiuk, K.
Wołoszyn, M.
Powiązania:
https://bibliotekanauki.pl/articles/97481.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
magnetic field
magnetization of ferromagnetic object
measurements of magnetic field
scalar magnetometers
detection of ferromagnetic object
Opis:
The paper presents the results of the analysis of the possibility of detecting ferromagnetic objects (ships, submarines, mines, etc.) by using two scalar magnetometers. By using two magnetometers of high sensitivity (in the order of magnitude of pT/Hz0,5) placed at a distance from each other and operating in a differential system, it is possible to detect ferromagnetic objects from a distance. It is necessary to compensate for the error code to synchronize the work of the two magnetometers. Ferromagnetic object’s detection by using two magnetometers requires proper configuration of the devices.
Źródło:
Computer Applications in Electrical Engineering; 2013, 11; 83-91
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Kinetic Theory of the '$2k_{F}$' Scattering Mechanism for Three-Dimensional Structurally Disordered Systems in the Ioffe-Regel limit
Autorzy:
Spisak, B.
Wołoszyn, M.
Powiązania:
https://bibliotekanauki.pl/articles/1402579.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Jv
72.15.Lh
72.15.Rn
Opis:
Effect of the coherent backscattering of the conduction electrons in three-dimensional structurally disordered metals specified by the Ioffe-Regel criterion is considered within the framework of the Morgan-Howson-Šaub theory of localisation which is based on the generalised kinetic equation for the Wigner distribution function and effective medium approximation. A formula for the electrical resistivity including the weak localisation correction is expressed in terms of the dimensionless transport parameter $k_{F}l$. The asymptotic form of the formula is derived and discussed in the context of the diagrammatic approach.
Źródło:
Acta Physica Polonica A; 2015, 128, 2; 213-215
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coherent potential approximation technique in a simple example of resistivity calculations for binary alloys
Autorzy:
Wołoszyn, M.
Maksymowicz, A. Z.
Powiązania:
https://bibliotekanauki.pl/articles/1931584.pdf
Data publikacji:
2002
Wydawca:
Politechnika Gdańska
Tematy:
Coherent Potential Approximation
Green function technique
binary alloy
density of states
resistivity
Opis:
Technique of the Coherent Potential Approximation applied for calculations of the density of states in binary alloys Ax B(1-x) is presented. Results of the calculations are also used to find the residual resistivity of the system versus concentration x.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 4; 669-680
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Competency model of village leader – the report of the field research
Model kompetencji sołtysa – raport z badań terenowych
Autorzy:
Jabłońska-Wołoszyn, M.
Borucka, E.
Powiązania:
https://bibliotekanauki.pl/articles/323625.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
public organizations
competencies
competence management
organizacje publiczne
kompetencje
zarządzanie kompetencjami
Opis:
One of the actors whose role is very firmly rooted in the idea of local self-government is the village leader. It performs a support function for the commune without being provided with formal authority and financial benefits and its work is subjected to very high expectations of the local community. By analyzing the literature, you will notice that there are only few publications on determinants of the village leader efficacy. Thus, the authors of the article have undertaken the task of exploring this topic further. The purpose of this article is to present the outcome of the competency workshop for village leaders and a proposal of the village leader competency model along with behavioral indicators of village leaders’ efficient operations. This article presents the theoretical basis of the competency model, methods of its identification and pointed out the specific aspect of field research in defining the competence model.
Jednym podmiotów w zarządzaniu publicznym jest sołtys, który pełni rolę wspierającą dla władz gminy. Analizując literaturę przedmiotu można zauważyć, że jest niewiele publikacji dotyczących wyróżników skuteczności pełnienia roli sołtysa, w związku z tym autorki artykułu podjęły próbę identyfikacji atrybutów kompetencyjnych współczesnego sołtysa. Celem niniejszego artykułu jest zaprezentowanie wyniku warsztatu kompetencyjnego dla sołtysów i propozycja modelu kompetencji sołtysa wraz ze wskaźnikami behawioralnymi jego efektywnego działania. W artykule przedstawiono podstawę teoretyczną modelu kompetencji, metody jego identyfikacji oraz zwrócono uwagę na aspekt specyfiki badań terenowych w definiowaniu modelu kompetencji.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2018, 128; 131-140
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Naval mine detection system based of FPGA circuit
Autorzy:
Wołoszyn, M.
Łubkowski, J.
Chomnicki, M.
Powiązania:
https://bibliotekanauki.pl/articles/97240.pdf
Data publikacji:
2011
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
FPGA
naval mines
electrical conductivity
Opis:
Electrochemical processes take place in a metal object immersed into sea water even if an anticorrosive coating is applied [1]. As a result, flowing field appears around the object. There are naval mines between many other objects situated in the sea. Naval mines can be put in the seabed in order to be more difficult to detect by sonars. Such a mine is located on the line demarking two environments of different electrical conductivity. The results of a computer analysis of the influence of seabed’s electrical conductivity on the electric field’s disposition around a mine model are shown below. Also, a naval mine detection system based on the FPGA circuit is presented.
Źródło:
Computer Applications in Electrical Engineering; 2011, 9; 60-68
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase-Space Approach to the Position-Momentum Correlations of the Conduction Electron States in a Double-Barrier Resonant Nanosystem
Autorzy:
Kaczor, U.
Wołoszyn, M.
Spisak, B.
Powiązania:
https://bibliotekanauki.pl/articles/1032445.pdf
Data publikacji:
2017-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.60.Gg
85.30.De
85.30.Mn
Opis:
The phase-space formulation of quantum mechanics based on the Wigner distribution function is applied to investigate the influence of the scattering processes on the electronic position-momentum correlations in the resonant-tunnelling nanosystem.
Źródło:
Acta Physica Polonica A; 2017, 132, 1; 106-108
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Dephasing and Geometrical Parameters on Quantum Correction to DC Conductance of Cylindrical Nanowires
Autorzy:
Spisak, B.
Wołoszyn, M.
Wójcik, P.
Powiązania:
https://bibliotekanauki.pl/articles/1399103.pdf
Data publikacji:
2013-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Rn
72.80.Ey
73.63.Nm
Opis:
Calculations of the quantum correction to the DC conductance of a cylindrical nanowire due to the quantum interference are presented. The real space Cooperon equation is solved for cylindrical geometry. Using this approach, it is shown that the quantum correction to the conductance in the weak localisation regime depends not only on the dephasing processes but also on geometrical parameters of the nanowire.
Źródło:
Acta Physica Polonica A; 2013, 124, 5; 838-840
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Masking of ferromagnetic ellipsoidal shell in Earth’s magnetic field
Autorzy:
Jakubiuk, K.
Wołoszyn, M.
Zimny, P.
Powiązania:
https://bibliotekanauki.pl/articles/97594.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
mathematical models of magnetic field
magnetization of ferromagnetic object
masking of ferromagnetic object
windings for demagnetization of the ship
Opis:
A ferromagnetic object, located in the Earth’s magnetic field, changes the distribution of that field. By measuring such disturbances it is possible to detect the object and destroy it. To conceal the object, a special winding is placed inside its ferromagnetic shell, which function is to eliminate the disturbances in the distribution of the Earth’s magnetic field. A thin walled ellipsoidal shell made of ferromagnetic material are examined as the object model. Coils are placed inside the shell and their function is to generate a magnetic field, which eliminates the effect the shell makes on the distribution of the Earth’s magnetic field in the surrounding area. Such a procedure is called magnetic masking and the winding used for this purpose is called the masking winding. The possibility of building the masking windings for the ferromagnetic ellipsoidal shell, situated in a magnetic field transverse in relation to its major axis, is also examined. Masking of a thin-walled ellipsoidal ferromagnetic object located in the longitudinal magnetic field is described in the article [1]. Investigating the possibility of masking of objects in a transverse magnetic field presented in this article will allow for a comprehensive assessment of a possibility of masking thin walled ferromagnetic objects of elongated ellipsoidal shape. The solution of Maxwell’s equations, which describe the magnetic field distribution caused by the ferromagnetic shell presence in the Earth’s magnetic field, are applied. Furthermore, the ability of selecting coils, which fully eliminate the perturbations of the magnetic field outside the shell are proven.
Źródło:
Computer Applications in Electrical Engineering; 2013, 11; 92-99
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multisource model of ship electric field
Autorzy:
Jakubiuk, K.
Zimny, P.
Wołoszyn, M.
Powiązania:
https://bibliotekanauki.pl/articles/97439.pdf
Data publikacji:
2011
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
magnetic field of the ship
mine protection
BEM
Opis:
A steel-hulled ship in sea water produces an electric field around itself. The source of this field are electrochemical processes and ship’s cathodic protection. The analysis of the electric field around the ship is important by the reason of the ship’s identification and counter-mine protection. The paper presents a simplified model of the ship’s multisource electric field, which allows to calculate the electric field distribution in the so-called distant zone around the ship in an approximate way using a PC, during time lasting from few up to several dozen of minutes.
Źródło:
Computer Applications in Electrical Engineering; 2011, 9; 78-84
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perturbation analysis of electric field around objects in sea water
Autorzy:
Jakubiuk, K.
Zimny, P.
Wołoszyn, M.
Powiązania:
https://bibliotekanauki.pl/articles/377479.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electric field
object in sea water
location methods
electric perturbations
Opis:
In marine environment there are different types of objects, such as ships or naval mines, which should be located and identified. One of the location methods is based on the electric potential distribution measurement [1, 2], The object with an insulating or conductive casing, placed in an electric field, causes some field perturbations. For the purpose of the object location the dimensions of the area, where it is possible to determine electric field perturbations by measurement, are important. In this way one can pre-determine the extent of the system for locating and identifying objects placed in the seawater. This paper presents an analytical approach to the perturbation analysis of electric field distribution caused by a sphere and an ellipsoid placed in a uniform electric field. The distance, beyond which the uniform electric perturbations can be neglected, is determined.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 81-88
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Making of ferromagnetic elliptical shell in transverse magnetic field
Autorzy:
Jakubiuk, K.
Wołoszyn, M.
Zimny, P.
Powiązania:
https://bibliotekanauki.pl/articles/377889.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
ferromagnetic object
magnetic field
ferromagnetic shell
Opis:
A ferromagnetic object, located in the Earth’s magnetic field, changes its distribution. Through measuring such disturbances, one can locate the object and destroy it. To conceal the object, a special winding is placed inside its ferromagnetic shell, and its task is to eliminate the disturbances in the distribution of the Earth’s magnetic field. A thin walled elliptical shell, made of ferromagnetic material, is examined as the object model. There are coils, placed inside the shell, and their task is to generate a magnetic field, which is eliminating the effect, the shell is making on the distribution of the Earth’s magnetic field in the surrounding area. Such a procedure is called magnetic masking and the winding used for this purpose is called the masking winding. The possibility of building the masking windings for the ferromagnetic elliptical shell, situated in a transverse magnetic field respectively to its major axis, is also examined. The solution of Maxwell’s equations, which are describing the magnetic field distribution caused by the ferromagnetic shell presence in the Earth’s magnetic field, is found. Furthermore, the ability of selecting coils, which are eliminating the perturbations of the magnetic field outside the shell completely, is proven.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 73; 131-136
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Dependent Transport through Metallic System with Magnetic Impurities
Autorzy:
Spisak, B.
Wołoszyn, M.
Paja, A.
Powiązania:
https://bibliotekanauki.pl/articles/1810518.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.Fk
72.25.Ba
73.63.Nm
Opis:
The problem of spin-dependent transport of electrons through a metallic nanostructure is considered. The system consists of non-magnetic metal wire with two magnetic impurities and is connected to two ferromagnetic leads. The differential conductance is calculated by using the transfer matrix method. The spin polarization of the conductance is also obtained. It was found that this polarization is dependent on the spin configuration of magnetic impurities. This dependence can be controlled by the applied bias voltage.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 266-268
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The method of location and identification of weak electric field source in seawater
Autorzy:
Jakubiuk, K.
Zimny, P.
Wołoszyn, M.
Powiązania:
https://bibliotekanauki.pl/articles/376626.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electric field
object location
object identification
seawater
Opis:
There are electrochemical processes occurring on a metal object surface in seawater. As the result of these processes, one can observe an electric field in the object vicinity. The paper presents the method and measurement system that allows to locate the detected object and to identify parameters of its simplified model in form of a current dipole. The identify method is based on the matrix norm minimization. The matrix contains results of measurements and parameters of the object in request taken as the current dipole. The results of simulation and experimental detection of sea mines are given. The research results confirmed the effectiveness of the developed method.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 103-109
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 29

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