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    Wyświetlanie 1-11 z 11
    Tytuł:
    Characterization of $Fe_3O_4$ Magnetic Nanoparticles Modified with Dextran and Investigation of Their Interaction with Protein Amyloid Aggregates
    Autorzy:
    Koneracká, M.
    Antošová, A.
    Závišová, V.
    Lancz, G.
    Gažová, Z.
    Šipošová, K.
    Juríková, A.
    Csach, K.
    Kováč, J.
    Tomašovičová, N.
    Fabián, M.
    Kopčanský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535048.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    87.14.em
    87.19.xr
    Opis:
    Functionalised magnetic nanoparticles composed of $Fe_3O_4$ particles stabilised by sodium oleate and subsequently modified with dextran (MFDEX) were prepared by the co-precipitation method. Their morphology and particle size distribution were observed by scanning electron microscopy and photon cross correlation spectroscopy. In order to confirm the modification of magnetite surface with dextran physical techniques, including infrared spectroscopy, thermal analysis, and magnetic measurement, were used. Finally, the effect of MFDEX on amyloid fibrillar aggregates of human insulin and hen egg white lysozyme, typical amyloidogenic proteins, was investigated. In vitro interaction of MFDEX with protein amyloid fibrils resulted into destruction of amyloid aggregates. The anti-amyloid activity makes MFDEX of potential interest as therapeutic agent against amyloid-related diseases.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 983-985
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanochemical Synthesis and Characterization of II-VI Nanocrystals: Challenge for Cytotoxicity Issues
    Autorzy:
    Baláž, P.
    Jardin, R.
    Dutková, E.
    Sayagués, M.
    Baláž, M.
    Mojžišová, G.
    Mojžiš, J.
    Turianicová, E.
    Fabián, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419910.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Dz
    81.07.Bc
    81.20.Ka
    81.20.Wk
    Opis:
    CdSe@ZnS nanocrystals have been prepared by a two-step solid state mechanochemical synthesis. CdSe prepared from elements in the first step is mixed with ZnS synthesized from zinc acetate and sodium sulfide in the second step. The crystallite size of the new type CdSe@ZnS nanocrystals determined by X-ray diffraction Rietveld refined method was 35 nm and 10 nm for CdSe and ZnS, respectively. Energy dispersive/transmission electron microscopy/energy dispersive spectroscopy methods show good crystallinity of the nanoparticles and scanning electron microscopy elemental mapping illustrate consistent distribution of Cd, Se, Zn and S elements in the bulk of samples. UV-VIS spectra show an onset at 320 nm with calculated bandgap 3.85 eV. This absorption arises from the vibration modes of Zn-S bonds. The nanocrystals show the blue shift from the bandgap of bulk ZnS (3.66 eV). The synthesized CdSe@ZnS nanocrystals have been tested for dissolution, cytotoxicity and L-cysteine conjugation. The dissolution of Cd was less than 0.05 μg $mL^{-1}$ (in comparison with 0.8 μg $mL^{-1}$ which was evidenced for CdSe alone). The very low cytotoxic activity for selected cancer cell lines has been evidenced. CdSe@ZnS nanocrystals coated with L-cysteine are water-soluble and have a great potential in biomedical engineering as fluorescent labels.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 224-229
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photocatalytic Properties of Mechanochemically Synthesized Nanocrystalline $ZnAl_2O_4$ and CdSe
    Autorzy:
    Kostova, N.
    Eliyas, Al.
    Fabián, M.
    Achimovičová, M.
    Baláž, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375494.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.-n
    61.05.cp
    61.46.-w
    61.66.Fn
    Opis:
    Nanocrystalline powders of $ZnAl_2O_4$ and CdSe were prepared via mechanochemical synthesis. Powder slurries were coated as thin films on $SiO_2$ thin layer chromatography (TLC) sheet by capillary method. The photocatalytic activity of the film coating was tested in a self-made gas-phase flat-plate continuous-flow photocatalytic reactor with toluene as model air contaminant. The tested nanocrystalline $ZnAl_2O_4$ turned out to be poor oxidation photocatalyst under UV irradiation. CdSe displays considerable photocatalytic activity under visible light, where $TiO_2$ is inactive. The nonconventional one-step mechanochemical route to $ZnAl_2O_4$ and CdSe synthesis offers several advantages compared to traditional processing routes, including low-temperature solid state reactions at ambient temperature, absence of organic templates contamination and low expenses.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4; 967-970
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of sparse linear discriminant analysis for prediction of protein-protein interactions
    Autorzy:
    Stąpor, K.
    Fabian, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/95137.pdf
    Data publikacji:
    2016
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    sparse discriminant analysis
    feature selection
    protein-protein interaction
    Opis:
    To understand the complex cellular mechanisms involved in a biological system, it is necessary to study protein-protein interactions (PPIs) at the molecular level, in which prediction of PPIs plays a significant role. In this paper we propose a new classification approach based on the sparse discriminant analysis [10] to predict obligate (permanent) and non-obligate (transient) protein-protein interactions. The sparse discriminant analysis [10] circumvents the limitations of the classical discriminant analysis [4, 9] in the high dimensional low sample size settings by incorporating inherently the feature selection into the optimization procedure. To characterize properties of protein interaction, we proposed to use the binding free energies. The performance of our proposed classifier is 75% ± 5%.
    Źródło:
    Information Systems in Management; 2016, 5, 1; 109-118
    2084-5537
    2544-1728
    Pojawia się w:
    Information Systems in Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of tempering on mechanical properties of induction bents below 540°C
    Autorzy:
    Jankejech, P.
    Fabian, P.
    Broncek, J.
    Shalapko, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/387337.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    HSLA
    Induction
    bending
    tempering
    stal niskostopowa
    właściwości mechaniczne
    mikrostruktura stali
    gięcie
    Opis:
    The article describes basic principles of induction bending and the change of mechanical properties from as received (straight) pipe made from HSLA steel to induction bend. The main purpose of this article is to experiment with tempering temperatures below 540°C. After tempering at 540°C which is the lowest recommended temperature for post bend heat treatment (PBHT) according to CSA specifications (Canadian Standards Association) the induction bend area in many cases does not achieve the minimum required mechanical properties and therefore it is not accepted for usage. In this article mechanical properties such as tensile, toughness, hardness are evaluated. Also the article contains microstructural analyses and comparison of bended and heat treated samples.
    Źródło:
    Acta Mechanica et Automatica; 2016, 10, 2; 81-86
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Practical use of the surface layers of laser modified WC-Cu coatings
    Praktyczne wykorzystanie warstw powierzchniowych WC-Cu modyfikowanych laserowo
    Autorzy:
    Pliszka, I.
    Radek, N.
    Gądek-Moszczak, A.
    Fabian, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/187862.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    electro-spark deposition
    laser processing
    coating
    obróbka elektroiskrowa
    obróbka laserowa
    powłoka
    Opis:
    The article presents the study of the effect of laser treatment on the microhardness of WC-Cu coatings applied by electro-spark deposition Observations of friction resistance test results allowed the evaluation of the coatings after laser treatment. The studies were conducted using WC-Cu electrodes, produced by sintering of nanostructural powders. The antiwear coatings were electro spark deposited over C45 carbon steel by means of EIL-8A, white the laser processing was performed by electro coats applied using a Nd:YAG, BLS720. Model tests were carried on test mechanical seals for rings made of SiC and WC-Cu coatings before and after laser treatment.
    Artykuł przedstawia badania wpływu obróbki laserowej na mikrotwardość obrabianych powłok WC-Cu nanoszonych metodą elektroiskrową. Na podstawie obserwacji badań oporów tarcia dokonano oceny właściwości powłok po obróbce laserowej. Docelowe badania przeprowadzono, wykorzystując elektrody WC-Cu, które wytworzono poprzez spiekanie nanostrukturalnych proszków metodą metalurgii proszków. Przeciwzużyciowe powłoki zostały naniesione elektroiskrowo na próbki ze stali C45 przy pomocy urządzenia produkcji ukraińskiej, model EIL-8A, natomiast obróbkę laserową nałożonych powłok elektroiskrowych wykonano laserem Nd:YAG, model BLS 720. Przeprowadzone zostały także badania modelowe na stanowisku do badań uszczelnień czołowych dla pierścieni wykonanych z SiC oraz powłok WC-Cu przed i po obróbce laserowej.
    Źródło:
    Tribologia; 2016, 270, 6; 121-130
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An algorithm of a freeform surfaces measurement adjustment using a specification of the workpiece coordinate system location
    Autorzy:
    Buša, J.
    Buša, J. Jr.
    Dovica, M.
    Fabian, M.
    Ižol, P.
    Honus, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/103412.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    freeform surface
    cloud of points
    Nelder-Mead method
    Newton method
    Opis:
    A difficulty of freeform surfaces evaluations lies in a setup of a coordinate measuring system in general, when it is not possible to use the standard system of alignment by a point, a line, and a surface. An algorithm for the measurement adjustment using a small workpiece coordinate system movement and rotation to achieve a smaller least square error of the produced surface for a given freeform surface defined by the function of two variables is considered. The algorithm uses the Newton method for calculation of the orthogonal distance of a measured point to a given surface and also for minimization of the sum of the distance squares. Numerical results for an example are given.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 3; 223-232
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Self-Hardening AlZn10Si8Mg Aluminium Alloy as an Alternative Replacement for AlSi7Mg0.3 Aluminium Alloy
    Autorzy:
    Vicent, M.
    Fabian, P.
    Tillova, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/381802.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    secondary AlSi7Mg0.3 alloy
    alloy AlZn10Si8Mg
    heat treatment
    self-hardening
    stop wtórny
    stop AlZnSiMg
    obróbka cieplna
    samoutwardzanie
    Opis:
    This article deals with the fatigue properties of newly used AlZn10Si8Mg aluminium alloy where the main aim was to determine the fatigue strength and compare it with the fatigue strength of AlSi7Mg0.3 secondary aluminium alloys which is used in the automotive industry for cyclically loaded components. AlZn10Si8Mg aluminium alloy, also called UNIFONT 90, is self-hardening (without heat treatments), which contributes to economic efficiency. This is one of the main reasons why is compared, and may be an alternative replacement for AlSi7Mg0.3 alloy which is heat treated to achieve required mechanical properties. The experiment results show that the fatigue properties of AlZn10Si8Mg alloy are comparable, if not better, than AlSi7Mg0.3 alloy. Fatigue properties of AlZn10Si8Mg alloy are achieved after seven days of natural ageing, immediately after casting and achieving value of fatigue strength is caused by structural components formed during solidification of the melt.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 3; 139-142
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    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:
    Compacted Graphite Iron with the Addition of Tin
    Autorzy:
    Gumienny, G.
    Kurowska, B.
    Fabian, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/947624.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    crystallization
    graphite irons
    tin
    cooling curve
    microstructure
    krystalizacja
    żeliwo grafitowe
    cyna
    krzywa chłodzenia
    mikrostruktura
    Opis:
    The paper presents the effect of tin on the crystallization process, microstructure and hardness of cast iron with compacted (vermicular) graphite. The compacted graphite was obtained with the use of magnesium treatment process (Inmold technology). The lack of significant effect of tin on the temperature of the eutectic transformation has been demonstrated. On the other hand, a significant decrease in the eutectoid transformation temperature with increasing tin concentration has been shown. It was demonstrated that tin narrows the temperature range of the austenite transformation. The effect of tin on the microstructure of cast iron with compacted graphite considering casting wall thickness has been investigated and described. The carbide-forming effect of tin in thin-walled (3 mm) castings has been demonstrated. The nomograms describing the microstructure of compacted graphite iron versus tin concentration have been developed. The effect of tin on the hardness of cast iron was given.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 3; 15-20
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of Heat Treatment of Carburization and Nitrocementation of 16MnCr5 Steel
    Autorzy:
    Kantoríková, Elena
    Fabian, P.
    Sýkorová, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2126897.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cementation
    nitrocementation
    heat treatment
    simulation
    carburizing
    cementowanie
    nitrocementacja
    obróbka cieplna
    symulacja
    nawęglanie
    Opis:
    Simulation is used today in many contexts, such as simulating technology to tune or optimize performance, safety engineering, testing, training, education, and entertainment. In some industries, simulations are commonly used, but in heat treatment this is rather an exception. The paper compares the simulation of carburization and nitrocementation of 16MnCr5 steel with a practical application. The aim was to determine the applicability of chemical heat treatment simulation. We were looking for an answer to the question: to what extent can we rely on the technological design of heat treatment? The software designed the heat treatment technology. He drew the technological process of chemical-thermal treatment of 16MnCr5 steel. The thickness of the cementite layer was 1 mm and the nitrocementation 1.2 mm. Changes in mechanical properties were observed. Cementing, nitrocementing, hardness, microhardness, metallography, and spectral analysis were practically performed. This article describes the benefits of simulation, speed and accuracy of the process. The only difference was in determining the carbon potential. The simulation confirmed the practical use and its contribution in the technological process.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 4; 97--102
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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