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Wyszukujesz frazę "magnetic parameters" wg kryterium: Temat


Wyświetlanie 1-14 z 14
Tytuł:
Lithology and palaeomagnetic record of Late Weichselian varved clays from NW Russia
Autorzy:
Bakhmutov, V.
Kolka, V.
Yevzerov, V.
Powiązania:
https://bibliotekanauki.pl/articles/2059241.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Kola Peninsula
Late Weichselian
varved clays
magnetic parameters
palaeomagnetism
Opis:
A lithological and palaeomagnetic analysis of Late Weichselian glaciolacustrine deposits from two ancient periglacial lakes was carried out in the valley of the Shuja (S Karelia) and Ust-Pjalka (S-E Kola Peninsula) rivers, NW Russia. The rhythmic structure of the varved clays is interpreted as turbiditic with systematic differences between the proximal and distal areas of accumulation. In the proximal area the textural and structural properties of the deposits towards both distal and (partly) lateral directions are described. It is shown that the proximal varve successions are incomplete while distally they are continuous. The accumulation of one varve (DE rhythm, second order cycle) during one year is consistent with palaeomagnetic data. Significant differences in magnetic parameters and in the palaeomagnetic "records" of declination-inclination between proximal and distal varves are established. Analysis of palaeomagnetic properties was combined with lithological analysis in all sections. Locally, the varved clays in the proximal area could be used for palaeomagnetic research. Taking into account the erosion of underlying deposits by turbidity currents and inclination shallowing, these sediments could not precisely record palaeosecular variation (PSV). The distal varved clays (represented by the DE rhythms) are clearly most useful both for varve-clay chronology and PSV recovery. The palaeomagnetic declination and inclination records are correlated with chrono- and magnetostratigraphy scheme of NW Russia. This paper also examines lithology-dependent "inclination error" and anisotropy of magnetic susceptibility in glaciolacustrine sediments.
Źródło:
Geological Quarterly; 2006, 50, 3; 353-368
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the stator geometry on magnetic bearing parameters
Autorzy:
Tomczuk, B.
Wajnert, D.
Powiązania:
https://bibliotekanauki.pl/articles/141529.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
parameters of active magnetic bearing
FEM method
Opis:
This paper presents an analysis of the stator teeth geometry impact on the parameters of the 8-pole radial magnetic bearing. In this paper, such parameters as current gain and position stiffness have been analysed. Additionally, we have proposed criteria for evaluating the characteristics of these parameters by calculating the variability of current gain and position stiffness. The research has been performed by solving the magnetic bearing actuator boundary problem using the finite element method. Magnetic force has been calculated using the Maxwell stress tensor method. Other parameters, such as current gain and position stiffness have been calculated as partial derivate of the force with respect to control current and position of the rotor.
Źródło:
Archives of Electrical Engineering; 2013, 62, 2; 209-215
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sprężystość mechaniczna w obwodach magnetycznych – część wstępna
The mechanical elasticity in magnetic circuits - the premises
Autorzy:
Żurek, Z.H.
Powiązania:
https://bibliotekanauki.pl/articles/1373774.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
efekt Villariego
efekt magnetosprężysty
zmienność parametrów magnetycznych
urządzenia elektryczne
maszyna elektryczna
Villari’s magnetoelastic effect
variability of magnetic parameters
electrical devices
electrical machines
Opis:
While designing electric devices it is usually assumed that material’s magnetic parameters are constant or influenced by temperature only. In real life, ferromagnetic material properties depend largely on mechanical stresses. The paper discusses these problems and the example given is electromagnet operation.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2009, 82; 39-43
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new method of inductive sensors impedance measurement applied to the identification of vehicle parameters
Autorzy:
Marszałek, Z.
Sroka, R.
Stencel, M.
Powiązania:
https://bibliotekanauki.pl/articles/221039.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inductive loop sensor
substitute parameters
magnetic profile
measurement of traffic parameters
Opis:
Inductive loop sensors are widely used for detection of presence, measurement of parameters as well as classification of vehicles. Vehicle classification may be performed based on their magnetic profiles. The magnetic profile is a signal which is proportional to the resultant of an impedance change of the sensor, caused by the measured object (the changes are minor - of the order of 1%). Generator and bridge circuits are most commonly used as conditioning circuits for such sensors. As a result we can obtain one output signal proportional to total changes of sensor parameters (R and L). In this paper, a modified bridge circuit that allows independent measurement of the components (R and L) of the sensor's impedance, has been proposed. With that provided, it is possible to receive broader information on the object, which allows higher classification resolution. This paper provides the concept of a circuit, model testing results, processing algorithms used and the test results of a real circuit.
Źródło:
Metrology and Measurement Systems; 2011, 18, 1; 69-76
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of coefficients of multivariable power series approximating magnetic nonlinearity of AC machines
Autorzy:
Sobczyk, T. J.
Warzecha, A.
Powiązania:
https://bibliotekanauki.pl/articles/141620.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnetism
magnetic field co-energy
mathematical modelling
parameters estimation
Opis:
Energy based approach was used in the study to formulate a set of functions approximating the magnetic flux linkages versus independent currents. The simplest power series that approximates field co-energy and linked fluxes for a two winding core of an induction machine are described by a set of common unknown coefficients. The authors tested three algorithms for the coefficient estimation using Weighted Least-Squared Method for two different positions of the coils. The comparison of the approximation accuracy was accomplished in the specified area of the currents. All proposed algorithms of the coefficient estimation have been found to be effective. The algorithm based solely on the magnetic field co-energy values is significantly simpler than the method based on the magnetic flux linkages estimation concept. The algorithm based on the field co-energy and linked fluxes seems to be the most suitable for determining simultaneously the coefficients of power series approximating linked fluxes and field co-energy.
Źródło:
Archives of Electrical Engineering; 2015, 64, 3; 379-389
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative Convergence Between Physical-Chemical Constants of the Proton and the Properties of Water : Implications for Sequestered Magnetic Fields and a Universal Quantity
Autorzy:
Persinger, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/412585.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
proton magnetic moment
hydronium ion
aggregate water properties
magnetic fields
spectrophotometry
10-20 J
cosmological parameters
Opis:
The ratio of the magnetic moment and charge of a proton when multiplied by the viscosity of water results in forces that when applied over the distance of O-H bonds provides quantum increments in the order of 10-20 J. Precise coefficients of this order of magnitude are consistent with the mechanisms associated with proton (H+) mobility and duration of the hydronium atom. When applied to aggregate properties of water that involve exclusion zones defined by boundaries containing marked proton density and coherent domains within which specific patterns of applied magnetic fields can be contained for protracted periods, these intrinsic properties suggest that the major features of the cell plasma membrane and living systems can be accommodated by proton movements within water. Water exposed in the dark to weak magnetic fields displayed a ~10 nm shift in peak wavelength as measured by a fluorescence spectrophotometer. Given the persistent emergence of 10-20 J as a functional unit of energy across the universe, the physical significance of the interaction between weak, temporally patterned magnetic fields and the organization of water within astronomical and abiogenic contexts may have been underestimated.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 2; 1-10
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of magnetic fields and fertilizers on grass and onion growth on technogenic soils
Autorzy:
Vasilyeva, Maria
Kovshov, Stanislav
Zambrano, Johnny
Zhemchuzhnikov, Maxim
Powiązania:
https://bibliotekanauki.pl/articles/1844328.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
alternating magnetic field
biochar
bioefficiency
biohumus
constant magnetic field
fertilization
physiological parameters of plants
technogenic soils
Opis:
The article deals with effect the use of organic (biohumus) and mineral (biochar) fertilizers based on the products of chicken vital activity on changing the fertility of technogenic sod-podzolic soils exposed to constant and unstable magnetic fields. The germination and growth dynamics of grasses and onions were investigated. The rational rate of introduction of the studied fertilizers into the technogenic soil is determined. Running (RMF) and direct (DMF) magnetic fields were applied in two ways: with fertilizers added and without fertilizers added. It has been established that the effect of preliminary magnetization of technogenic soil has a significant effect on lawn grass germination and the length of onion feathers, which are more than twice the height when exposed to the RMF, as compared with DMF. The effect of RMF on grass germination was also twice as high for DMF, when fertilizers were added. The DMF magnetization and biohumus helps to increase the grass sprout height by 10–20%. Onion sprouts were higher in two cases: DMF and biohumus; RMF and biochar. The influence of the factor of fertilizer type has a significant effect in 30–40% of cases, whilst at a spread rate of more than 5%, significant chemical activity of biochar negatively affects the germination of both grass and onion.
Źródło:
Journal of Water and Land Development; 2021, 49; 55-62
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geophysical cartography in Poland : an overview
Autorzy:
Krzywiec, P.
Nawrocki, J.
Polechońska, O.
Wróblewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2065895.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
geophysical cartography
seismic data
magnetic field
gravity field
thermal field
petrophysical parameters
Opis:
Regional analysis and mapping of various geophysical data has been recognized as an important — even crucial — element of geological studies for many years. Due to rapid development of advanced numerical tools it is presently possible to construct, maintain and comprehensively analyse even very large geo-databases, including seismic, gravity, magnetic, geothermal and other geophysical data. In many countries, national geological surveys, commercial companies and research institutions are involved in mapping projects focused on spatial representation of geophysical data that could later be used for various studies. Recently, new policy of the Polish Ministry of Environment regarding geological cartography in years 2005–2020 has been declared (cf. Ber & Jezierski, 2004). In this document, geological cartography is used as a rather wide term that includes also other geo-disciplines like geoenvironmental studies or surface geochemistry. Among them, mapping of geophysical data is also mentioned. In this paper, short overview of the current state-of-the-art of selected aspects of regional geophysical mapping in Poland is given, with some remarks regarding potential directions of future work.
Źródło:
Przegląd Geologiczny; 2005, 53, 10/2; 967-972
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Selected Parameters of Organic-Inorganic Hybrid Membranes Based on Various Polymers and Nd-Fe-B Fillers
Autorzy:
Rybak, A.
Kaszuwara, W.
Powiązania:
https://bibliotekanauki.pl/articles/352783.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
organic-inorganic hybrid membranes
magnetic measurements
rheological parameters
mechanical properties
gas separation
Opis:
In this paper magnetic organic-inorganic hybrid membranes based on EC, PPO polymer matrices and various magnetic powder microparticles were synthesized and studied. Constant pressure permeation technique and the Time Lag method were used to obtain the gas transport coefficients. The mechanical, rheological and magnetic parameters of magnetic hybrid membranes were examined. It was found that their separation and gas transport properties (D, P, S and α) were improved with the decrease in powder particle size and the increase of membrane’s remanence, saturation magnetization and magnetic particle filling. The increase of the magnetic powder addition and a decrease of its granulation improved also mechanical and rheological parameters of the tested membranes. This improvement also had a positive effect on their gas separation properties and their potential usage in the future.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1825-1832
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie parametrów pracy wybranych przetworników do pomiaru pola magnetycznego
Examination parameters of selected transducers for measuring magnetic field
Autorzy:
PTAK, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/456014.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Rzeszowski
Tematy:
przetwornik Halla
parametry pracy
badanie pola magnetycznego
Hall transducer
operating parameters
magnetic field investigating
Opis:
W artykule przedstawiono badania parametrów pracy wybranych przetworników Hallotronowych. Przetworniki tego typu mogą służyć do pomiarów różnorodnych wielkości nieelektrycznych, takich jak np. pomiary grubości warstw wierzchnich, pomiary defektoskopowe, pomiary odległości, przesunięcia czy prędkości obrotowej. Opisane przetworniki posłużyły do badania wartości indukcji pola magnetycznego. Badania przeprowadzono dla zmiennej odległości od źródła pola magnetycznego, sprawdzono odpowiedzi czujników przy zmianie częstotliwości sygnału pomiarowego oraz charakterystykę sygnału wyjściowego przy zmianie wartości badanej indukcji magnetycznej
The article presents a study on parameters of selected transducers of Hall effect. Converters of this type can be used for a variety of non-electrical measurements such as measurements of thickness of outer layers, flaw detection measurements, distance measurements, or shift speed. Described transducers were used to study magnetic field. The study was conducted for a variable distance from source of magnetic field, sensor response was checked when changing measurement frequency and characteristics of output signal when changing value of magnetic induction test.
Źródło:
Edukacja-Technika-Informatyka; 2014, 5, 1; 648-653
2080-9069
Pojawia się w:
Edukacja-Technika-Informatyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ pola magnetycznego niskiej częstotliwości na parametry morfotyczne krwi pacjentów poddanych magnetoterapii
The influence of low magnetic field on morphotic parameters of blood on patients after magnetotherapy
Autorzy:
Ciejka, E.
Powiązania:
https://bibliotekanauki.pl/articles/261354.pdf
Data publikacji:
2009
Wydawca:
Politechnika Wrocławska. Wydział Podstawowych Problemów Techniki. Katedra Inżynierii Biomedycznej
Tematy:
pole magnetyczne niskiej częstotliwości
parametry morfotyczne krwi
low frequency magnetic field
morphotic parameters of blood
Opis:
Wstęp. Magnetoterapia jest formą terapeutyczną, wykorzystującą zmienne pole magnetyczne niskiej częstotliwości. Celem pracy było zbadanie jego wpływu na parametry morfotyczne krwi pacjentów poddanych terapii polem magnetycznym. Materiał i metody. Badaniem objęto pacjentów poddanych działaniu pola magnetycznego niskiej częstotliwości, u których wykonano badania parametrów morfotycznych krwi: liczbę krwinek białych (WBC - White Blood Cells), krwi-nek czerwonych (RBC - Red Blood Cells), zawartość hemo-globiny (HGB - Haemoglobin), wskaźnik hematokrytu (HCT - Hematocrit), średnia objętość krwinki czerwonej (MCV- Mean Cell Volume), średnia masa hemoglobiny w krwin-ce czerwonej (MCH - Mean Corpuscular Haemoglobin Con-centration), średnie stężenie hemoglobiny w krwinkach (MCHC - Mean Corpuscular Haemoglobin), liczbę płytek krwi (PL - Plateles). Wyniki i wnioski. Pole magnetyczne niskiej częstotliwości o pa-rametrach: częstotliwość 20-40 Hz, indukcja 5-7 mT i czas działania 20 minut nie powoduje istotnych zmian w parametrach morfologii krwi pacjentów poddanych magnetoterapii. U ba-danych pacjentów zaobserwowano istotne statystycznie zwiększenie wartości średniej objętości krwinek czerwonych.
Background. Magnetotherapy of low frequency exploits variable magnetic field. The aim of thus research was to examine the influence of low magnetic field on blood parameters of patients subjected to magnetotherapy. Material and methods. The examination was carried out on patients, who were subjected to activity of low magnetic field. The aimof this research was to examine the following blood parameters: WBC (White Blood Cells), RBC (Red Blood Cells), HGB (Haemoglobin), HCT (Hematocrit), MCV (Mean Cell Volume), MCH (Mean Corpuscular Haemoglobin Concentration), MCHC (Mean Corpuscular Haemoglobin), PL (Plateles). Results and conclusion. Low magnetic field does not influence the morphotic parameters of blood. The obtained values are statistically significant for MCV, which increased in patients subjected to magnetotherapy.
Źródło:
Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna; 2009, 15, 3; 198-200
1234-5563
Pojawia się w:
Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of EMR data for Fe2+(S=2) ions in a [2Fe-2S] cluster in the reduced ferredoxin
Autorzy:
Rudowicz, Cz.
Piwowarska, D.
Gnutek, P.
Powiązania:
https://bibliotekanauki.pl/articles/146266.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
[2Fe-2S] cluster
electron magnetic resonance (EMR)
Fe2+ ions
microscopic spin Hamiltonian (MSH)
zero field splitting (ZFS) parameters
Opis:
The modelling techniques employed in this study utilize structural data to enable correlation of EMR data – described by the spin Hamiltonian (SH) and optical spectroscopy data – described by the crystal field (CF) Hamiltonian. These techniques enable also to predict magnetic and spectroscopic properties of 3dN ions, especially 3d4 and 3d6 ions, in various systems. Specific applications are considered for [Fe2+ and Fe3+] binuclear centres in [2Fe-2S] cluster in the reduced ferredoxin and related biological molecules. The background for model calculations of the zero-field splitting (ZFS) parameters and/or crystal field parameters and the capabilities of the two major techniques used will be presented in the full paper. Here, we present preliminary results of the microscopic spin Hamiltonian (MSH) modelling for Fe2+ (3d6) ions in the reduced ferredoxin.
Źródło:
Nukleonika; 2013, 58, 3; 347-350
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat transfer study in a convective-radiative fin with temperature-dependent thermal conductivity and magnetic field using variation parameters method
Autorzy:
Sobamowo, G.
Jayesimi, L.
Femi-Oyetoro, J.
Powiązania:
https://bibliotekanauki.pl/articles/122666.pdf
Data publikacji:
2017
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
heat transfer study
convective-radiative fin
variation of parameters method
temperature-dependent thermal conductivity
magnetic field
wymiana ciepła
przewodność cieplna
żebro
Opis:
In this work, a heat transfer study is carried out in a convective-radiative straight fin with temperature-dependent thermal conductivity and a magnetic field using the variation of parameters method. The developed heat transfer model is used to analyze the thermal performance, establish the optimum thermal design parameters and investigate the effects of thermo-geometric parameters and non-linear thermal conductivity parameters on the thermal performance of the fin. The results obtained are compared with the results in literature and good agreements are found. The analysis can serve as basis for comparison of any other method of analysis of the problem and it also provides a platform for improvement in the design of fin in heat transfer equipment.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2017, 16, 3; 85-96
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pomiary parametrów morfologiczno-czynnościowych stawu kolanowego z wykorzystaniem obrazowania rezonansem magnetycznym
Measurements of morphological and functional parameters of the knee joint using magnetic resonance imaging
Autorzy:
Ryniewicz, A.
Ryniewicz, A. M.
Sładek, J.
Knapik, R.
Powiązania:
https://bibliotekanauki.pl/articles/157400.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
staw kolanowy
parametry morfologiczno-czynnościowe
identyfikacja kształtu
rezonans magnetyczny
chrząstka stawowa
knee joint
morphological and functional parameters
shape identification
magnetic resonance
joint cartilage
Opis:
Celem była identyfikacja kształtu i położenia struktur stawu kolanowego obrazowanego rezonansem magnetycznym (MR) w stabilizowanej pozycji, w aspekcie rozkładu grubości chrząstki stawowej. Badano prawidłowe stawy kolanowe. Obrazowanie przeprowadzono przy wykorzystaniu aparatu MR typu otwartego ze stabilizatorem kąta zgięcia kolana w przekrojach strzałkowych, czołowych i horyzontalnych, w wybranych pozycjach kątowych. Pomiary chrząstki budującej powierzchnie stawowe stawu kolanowego wykazały znaczne zróżnicowanie jej grubości oraz pofalowania z charakterystycznym przesunięciem fali.
The aim of the study was to use the MRI to identify the shape and position of the structures of knee joints in a stabilized position, in terms of the analysis of joint cartilage thickness on femoral condyles, tibia condyles and the patella. There were studied normal knee joints. Imaging was performed with use of an open-type gradient coil MR apparatus with a knee bending angle stabilizer. The research strategy consisted of imaging: sagittal sections in a fixed position of the femoral bone relative to tibia, in selected sagittal sections for stabilized position of the femur relative to tibia for angles ranged from -10 degrees to 50 degrees, at 5 degree intervals, in the frontal sections with physiological extension, in the horizontal sections with physiological extension. Based on the MR imaging, there was measured the distribution of the thickness of joint cartilage that covered the femoral condyles, condyles of tibia and patella. The measurements of the cartilage building the surfaces of the knee joint showed significant variation in its thickness and folds with a characteristic wavelength shift in the tested sections. Variable thickness and uneven structures can substantially affect the conditions of joint lubrication and transfer of the locomotive load. Introduction of the stabilized position of the femur relative to tibia to the MR imaging allows useful identification of particular cartilage layers that work together.
Źródło:
Pomiary Automatyka Kontrola; 2013, R. 59, nr 3, 3; 200-203
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
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