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    Wyświetlanie 1-12 z 12
    Tytuł:
    Dielectric Properties of Lyotropic Magnetic Liquid Crystal
    Autorzy:
    Kopčanský, P.
    Tomčo, L.
    Jadzyn, J.
    Swiergiel, J.
    Majorošová, J.
    Kubovčíková, M.
    Timko, M.
    Rajňák, M.
    Šipošová, K.
    Gažová, Z.
    Bednariková, Z.
    Hu, Chin-Kun
    Hayryan, S.
    Studenyak, I.
    Kovalchuk, T.
    Kovalchuk, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387983.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.Gd
    61.30.St
    75.50.Mm
    Opis:
    An important feature of lyotropic liquid crystals is the self-assembly of the amphiphilic molecules as supermolecular structures. We have studied the formation of nematic liquid crystal phase in solutions containing lysozyme amyloid fibrils and magnetic nanoparticles using oscilloscopic method. Interaction of fibrils with magnetic nanoparticles under the external magnetic field resulted in fibril re-arrangement. The analysis of the obtained results suggests that the decrease in conductivity of solutions in presence of magnetic field is due to decrease of the ion mobility caused by re-arrangement of structures in the solution. The obtained results allow determination of the optimum ratio of the components which can lead to preparation of solutions with a more ordered structure in presence of magnetic field.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 632-634
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dielectric Properties of Magnetic Liquids in High Electric Fields
    Autorzy:
    Herchl, F.
    Kopčanský, P.
    Timko, M.
    Koneracká, M.
    Marton, K.
    Kolcunová, I.
    Tomčo, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813918.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    77.22.-d
    Opis:
    In this work, dielectric properties of magnetic fluids composed of magnetite particles dispersed in transformer oil and subjected to a uniform magnetic field were investigated at the high alternating electric field intensities in the range of 0.5-2.5 MV/m. Dielectric stability of the magnetic fluid with the particle volume concentrationΦ= 0.0019 was observed. The magnetic fluid with the concentrationΦ= 0.019 showed the significant changes of permittivity and dielectric losses, too.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 569-572
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Biocompatible Magnetic Fluid after Electron Irradiation
    Autorzy:
    Tomašovičová, N.
    Haysak, I.
    Koneracká, M.
    Kováč, J.
    Timko, M.
    Závišová, V.
    Okunev, A.
    Parlag, A.
    Fradkin, A.
    Sakhno, V.
    Kopčanský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1429089.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    61.80.Fe
    61.82.Rx
    Opis:
    The magnetic particles in the water-based magnetic fluids were sterically stabilized by natrium oleate to prevent their agglomeration and consequently the adsorption of poly-ethylene-glycol (PEG) was carried out to improve the biocompatibility of the magnetic particles. Two sets of samples were prepared. The first set of the samples was with different molar weight of PEG (Mw = 400, 1000, 10000 and 20000) at the constant weight ratio of PEG/$Fe_3O_4$ = 0.25 and the second one was with different weight ratio of PEG/$Fe_3O_4$ and constant molar weight of PEG (Mw = 1000). The samples were irradiated with 20 Gy. The same reduction of saturated magnetization (about 10%) after electron irradiation with 20 Gy was observed for all prepared samples.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1302-1304
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Magnetite Formed by Biomineralization and Chemical Synthesis
    Autorzy:
    Timko, M.
    Džarová, A.
    Kopčanský, P.
    Závišová, V.
    Koneracká, M.
    Kováč, J.
    Šprincová, A.
    Vaclavíková, M.
    Ivaničová, L.
    Vávra, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813922.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.75.+a
    47.65.Cb
    87.83.+a
    Opis:
    In this work, the magnetic properties of biologically produced magnetite (magnetosomes) by biomineralization process were compared to those of chemically synthesized $Fe_3O_4$. The coercivity of 185 Oe in magnetosomes is connected with the fact that the mean diameter is larger than critical size for transition from superparamagnetic to ferromagnetic behavior. A sharp magnetic transition at 105 K (Verwey transition) is clearly present in magnetosomes while in opposite, this transition is missing in $Fe_3O_4$.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 573-576
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Milled and Thermal Relaxed YBa$\text{}_{2}$ (Cu$\text{}_{1-x}$Fe$\text{}_{x}$)$\text{}_{3}$O$\text{}_{y}$
    Autorzy:
    Timko, M.
    Kováč, J.
    Sargánková, I.
    Zentková, M.
    Mihalik, M.
    Maťaš, S.
    Čiasnohová, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955517.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.90.+n
    74.10.+v
    74.70.-b
    Opis:
    The influence of the mechanical milling and subsequent thermal relaxation on magnetic and superconducting behaviour of YBa$\text{}_{2}$(Cu$\text{}_{1-x}$Fe $\text{}_{x}$)$\text{}_{3}$O$\text{}_{y}$ system has been studied. Two methods of heat treatment were used: Set I - slow cooling from 980°C in flowing O$\text{}_{2}$ and Set II - reducing at 770°C in flowing Ar$\text{}_{2}$ followed by reoxidation in flowing O$\text{}_{2}$ below 400°C. The transition to superconductivity, diamagnetic response, critical current density and the effective magnetic moment in the normal state have been estimated. Our measurements indicate that the reducing atmosphere preparation is less detrimental on superconducting properties. The results are discussed in terms of occupancy Cu sites by Fe and redistribution of oxygen atoms.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 355-358
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation Stability of the BSA Modified Biocompatible Magnetic Fluid
    Autorzy:
    Tomašovičová, N.
    Haysak, I.
    Kováč, J.
    Kubovčíková, M.
    Závišová, V.
    Timko, M.
    Okunev, A.
    Zorkovská, A.
    Kopčanský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368667.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    61.30.Gd
    64.70.Md
    Opis:
    The aim of the presented work was to investigate the stability of biocompatible magnetic fluid, i.e. water-based magnetic fluid containing magnetite nanoparticles stabilized by surfactant sodium oleate and modified by bovine serum albumin (BSA) after electron irradiation. Samples with the same concentration of $Fe_{3}O_{4}$ but different mass ratio BSA/$Fe_{3}O_{4}$ (w/w=0.25, 1.0 and 2.5) were studied. The electron irradiation caused about 10% reduction of the saturation magnetization in the samples with w/w BSA/$Fe_{3}O_{4}$ ratio of 0.25 and less than 5% in the samples with w/w BSA/$Fe_{3}O_{4}$ ratio of 1 and 2.5.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 262-263
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sensitivity of 6CHBT Liquid Crystal Doped with Ferroelectric or Magnetic Particles to Electric and Magnetic Fields
    Autorzy:
    Majorošová, J.
    Tomašovičová, N.
    Timko, M.
    Koneracká, M.
    Studenyak, I.
    Kovalchuk, O.
    Kovalchuk, S.
    Jadżyn, J.
    Kopčanský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368661.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    61.30.Gd
    64.70.Md
    Opis:
    Introduction of ferroelectric or magnetic nanoparticles into nematic liquid crystal is a promising method for the improvement of the electro-optic or magneto-optic properties of different nematic liquid crystals by non-chemical way. This work is devoted to the study of composite systems of liquid crystal with spherical ferroelectric or magnetic particles with the aim to study their sensitivity to electric and magnetic fields. The nematic 4-(trans-4'-n-hexylcyclohexyl)-isothiocyanatobenzene (6CHBT) liquid crystal was doped with SbSI ferroelectric particles or with $Fe_{3}O_{4}$ magnetic particles. The structural transitions in ferronematic samples were indicated by capacitance measurements in a capacitor made of ITO-coated glass electrodes in combined electric and magnetic fields. The obtained results showed the increase of the shift in critical voltage with increasing magnetic field in both kinds of samples.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 260-261
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Dynamics of the Soret Effect in Thin Film of Magnetic Fluid
    Autorzy:
    Kopčanský, P.
    Tomčo, L.
    Timko, M.
    Ocelík, V.
    Koneracká, M.
    Turek, I.
    Štelina, J.
    Musil, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013709.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    66.10.Cb
    75.50.Mm
    Opis:
    The Soret effect in interference field of two intensive laser beams in the thin film of magnetic fluid was used to create a periodical structure of density of magnetic particles. The structures obtained were indicated using the self-diffraction of the optical beam creating the structures. The relaxation phenomena after switching off the laser interference field were discussed in terms of the spectrum of relaxation times. This spectrum is proportional to hydrodynamic particle size distribution. The relaxation of optical grating consists of two well-defined channels, i.e. decay through single particles and small aggregates, respectively.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 875-878
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of green space to reduce the acoustic load on highway in a residential area of the city of Bryansk
    Wpływ obszarów zielonych na redukcję obciążenia hałasem od autostrady osiedla mieszkaniowego w Briańsku
    Autorzy:
    Timko, I.
    Gorodkov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2068019.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    level of the noise
    acoustic measure
    acoustic pollution
    green areas
    poziom hałasu
    pomiar akustyczny
    zanieczyszczenie akustyczne
    tereny zielone
    Opis:
    This article discusses the role of green space in reducing the noise level on the example of the park named of honor of Gaidukov in the city of Bryansk. The results of measuring the level of noise in spring and summer, as well as schemes prepared with the application of contour noise were presented.
    W artykule omówiono rolę zieleni na zmniejszenie poziomu hałasu na przykładzie parku w mieście Briańsk. Pomiary poziomu hałasu wykonano w okresie wiosennym i letnim, przygotowano schemat z zastosowaniem krzywej hałasu.
    Źródło:
    Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo; 2015, 21 (171); 340--345
    0860-7214
    Pojawia się w:
    Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Response of a Magnetic Fluid to Radio Frequency Electromagnetic Field
    Autorzy:
    Dolník, B.
    Rajňák, M.
    Cimbala, R.
    Kolcunová, I.
    Kurimský, J.
    Balogh, J.
    Džmura, J.
    Petráš, J.
    Kopčanský, P.
    Timko, M.
    Briančin, J.
    Fabián, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032825.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.Jb
    41.20.Gz
    75.50.Mm
    81.70.Ex
    07.50.Hp
    Opis:
    Electromagnetic pollution generated by the electrical devices has been regarded as a new form of pollution, harmful to the society as air and water pollution. The operation of electronic devices in a polluted electromagnetic environment has caused electromagnetic interference to become important concerns. Devices that are vulnerable to interference must often be shielded to protect them from the effects of electromagnetic interference. In this work we describe an interaction of a magnetic fluid based on transformer oil with alternating magnetic field. The magnetic fluid was composed of a transformer oil and dispersed magnetite nanoparticles coated with oleic acid. Among the wide range of topics covered, we pay attention to an important field related to the absorption of electromagnetic field by magnetic fluid as a suitable candidate for applications where it is necessary to electrically isolate, remove excess of heat, and to shield electromagnetic fields. We present a method for the determination of shielding effectiveness of the magnetic fluid under high-frequency excitation conditions from 750 MHz to 3 GHz by means of magnetic near field measurements and analysis. Herein, we report the effect of magnetic volume fraction in the magnetic fluid and the effect of the sample thickness on the shielding effectiveness. We have found that the magnetic fluid has a frequency dependent "windows", characterized that either absorb the magnetic field, or facilitate penetration of the magnetic field through the barrier.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 946-948
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Shielding Effectiveness of a Magnetic Fluid in Radio Frequency Range
    Autorzy:
    Dolník, B.
    Rajňák, M.
    Cimbala, R.
    Kolcunová, I.
    Kurimský, J.
    Džmura, J.
    Petráš, J.
    Zbojovský, J.
    Kosterec, M.
    Kopčanský, P.
    Timko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030481.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.Jb
    41.20.Gz
    75.50.Mm
    81.70.Ex
    07.50.Hp
    Opis:
    This article builds on the previous work and describes the interaction of transformer oil-based magnetic fluid (MF) with the radio frequency (RF) magnetic near-field. Three prepared samples of the MF used as a barrier to magnetic near-field, consist of transformer oil and dispersed magnetite nanoparticles coated with oleic acid. We pay attention to the important area related to the electromagnetic field shielding by the MF. Such sample of the MF may be a good candidate for applications where it is necessary to simultaneously electrically isolate, remove the excess of heat and to shield electromagnetic interference (EMI). We present a method for the determination of shielding effectiveness (SE) of the MF under RF excitation conditions ranging from 500 MHz to 3 GHz. We report the effect of magnetic volume fraction in the MF and the effect of the sample thickness on the SE.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 585-587
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrasound Frequency Analysis of a Magnetic Fluid in Low-Intensity External Magnetic Field
    Autorzy:
    Kurimský, J.
    Rajňák, M.
    Cimbala, R.
    Dolník, B.
    Tóthová, J.
    Paulovičová, K.
    Timko, M.
    Kopčanský, P.
    Kolcunová, I.
    Petráš, J.
    Džmura, J.
    Balogh, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032764.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.58.+z
    43.60.+d
    47.65.Cb
    82.70.Dd
    83.80.Hj
    Opis:
    This work deals with an interaction of a magnetic fluid of a dielectric nature with a magnetic field by means of ultrasound waves measurements and analysis. Ultrasound analysis is known as a non-destructive inspection tool often used in technical diagnostics, moreover, it has numerous applications in medicine and biology, too. We report the low-frequency ultrasound analysis of a dielectric magnetic fluid in a low-intensity external static magnetic field. The studied magnetic fluid was composed of a transformer oil and dispersed magnetite nanoparticles coated with oleic acid. Experiments were carried out by using an ultrasonic testing cell. The cell was exposed to a magnetic field of 50 mT in both parallel and perpendicular direction to the waves propagation. A through-transmission mode measurement was applied, where two fixed narrow-band transducers with completely shielded crystal for maximum RFI/EMI immunity (Physical Acoustic R15I-AST, the resonant frequency 150 kHz) served as a transmitter and a receiver. In this way we carried out the measurement of the frequency-dependent ultrasonic response to a rectangle calibrating signal of 5 μs pulse width. Digitized signals were recorded for further analysis. We present the frequency domain analysis of the low-frequency ultrasound in magnetic fluid. The frequency spectrum in magnetic fluid colloidal system was calculated by the Fourier transformation method. Results show that there is a frequency shift in the amplitude-frequency spectrum caused by the step-up magnetic field. The higher the magnetic field, the higher the frequency of the peaks. The effect of particle aggregation in magnetic field on the ultrasound wave propagation is discussed in the paper.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 910-912
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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