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    Wyświetlanie 1-4 z 4
    Tytuł:
    Wpływ czynników chemicznych na strukturę i budowę włosów ludzkich
    The influence of chemical factors on the structure of human hair
    Autorzy:
    Dobosz, Magda
    Kalska-Szostko, Beata
    Powiązania:
    https://bibliotekanauki.pl/articles/171505.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    badanie włosów
    chemia kryminalistyczna
    skaningowa mikroskopia elektronowa
    spektroskopia rentgenowska z dyspersją energii
    energy dispersive X-ray spectroscopy
    hair tests
    forensic chemistry
    scanning electron microscopy
    Opis:
    The main purpose of the presented study was to investigate the influence of chemical factors on the morphology of human hair. Few factors that may occurduring criminal offenses were selected for testing, including aqueous solutions of hydrochloric acid (HCl), sodium hydroxide (NaOH), lead(II) nitrate (Pb(NO3)2), cadmium(II) nitrate (Cd(NO3)2), sodium chloride (NaCl), ethanol (C2H5OH), water (H2O). The description of the effects of chosen chemical compounds on hair was made mainly on the basis of Scanning Electron Microscopy (SEM). In addition, the elemental composition of the hair as an effect of interaction with solution was examined and analyzed using an EDX (Energy - Dispersive X-ray) spectrometry. Performed tests show the degree of human hair degradation and contamination depending on the examined factor and time.
    Źródło:
    Wiadomości Chemiczne; 2020, 74, 7-8; 453-476
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Działanie czynników mechanicznych oraz termicznych na morfologię włosów ludzkich i zwierzęcych
    Effect of mechanical and thermal factors on the structure of human and animal hair
    Autorzy:
    Dobosz, Magda
    Kalska-Szostko, Beata
    Powiązania:
    https://bibliotekanauki.pl/articles/1410887.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    badanie włosów
    chemia kryminalistyczna
    skaningowa mikroskopia elektronowa
    spektroskopia rentgenowska z dyspersją energii
    energy dispersive X-ray spectroscopy
    hair tests
    forensic chemistry
    scanning electron microscopy
    Opis:
    The main purpose of the presented study was to investigate and compare the influence of mechanical and thermal factors on the morphology of human and animal hair. Several factors that may occur during criminal offenses were selected for testing including cutting by a scalpel or scissors, damaging by a hammer; and high, or low-temperature thermal treatment (heating for 1h, or 24 hours at elevated temperatures 100°C, 200°C, and 300°C, as well as freezing for 24 hours at -20°C, or for 10 minutes in liquid nitrogen (-197°C)). The impact of selected mechanical and temperature factors on human and animal hair was made mainly on the basis of Scanning Electron Microscopy (SEM). Moreover, the elemental composition of the hair was investigated and analyzed using an EDX (Energy - Dispersive X-ray) spectrometry. Performed tests show the degree of human hair degradation depending on the examined factor and time.
    Źródło:
    Wiadomości Chemiczne; 2021, 75, 5-6; 823-844
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tribological properties of the FeNi alloys electrodeposited with and without external magnetic field assistance
    Autorzy:
    Białostocka, Anna Maria
    Klekotka, Marcin
    Klekotka, Urszula
    Kalska-Szostko, Beata
    Powiązania:
    https://bibliotekanauki.pl/articles/2200931.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    electrodeposition
    magnetic fields
    Cu substrate
    CuZn substrate
    FeNi coatings
    microhardness
    roughness
    friction
    wear
    Opis:
    The hereby work presents the tribological properties of the iron-nickel alloys and their dependence on the microstructure and thickness of the probes as well as the presence of an external magnetic field during the synthesis. Coatings were electroplated on the brass and copper metallic substrates using galvanostatic deposition in the same electrochemical bath condition (Fe and Ni sulfates) and the electric current density. The surface morphology of the films was observed by Scanning Electron Microscopy. The average composition of all FeNi coatings was measured using Energy Dispersive X-ray Spectroscopy. Tribo-mechanical properties such as microhardness, roughness, and friction coefficient were determined in the obtained structures. The morphology and tribologial properties of the FeNi coatings clearly depend on both the substrate (Cu, CuZn) itself and the presence of an external magnetic field (EMF) applied during the deposition process.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 4; 687--694
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Substrates with different magnetic properties versus iron-nickel film electrodeposition
    Autorzy:
    Białostocka, Anna M.
    Klekotka, Marcin
    Klekotka, Urszula
    Żabiński, Piotr R.
    Kalska-Szostko, Beata
    Powiązania:
    https://bibliotekanauki.pl/articles/31342692.pdf
    Data publikacji:
    2023
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    electrodeposition
    magnetic field
    magnetohydrodynamics
    substrate
    thin films
    iron-nickel alloys
    elektroosadzanie
    pole magnetyczne
    magnetohydrodynamika
    substrat
    cienkie warstwy
    stopy żelazo-nikiel
    Opis:
    The hereby work presents the iron-nickel alloys electroplated on the different metallic substrates (aluminium, silver, brass) using galvanostatic deposition, with and without presence of the external magnetic field (EMF). The films were obtained in the same electrochemical bath composition - mixture of iron and nickel sulphates (without presence of additives) in the molar ratio of 2 : 1 (Ni : Fe), the electric current density (50.0 mA/cm2), and the time (3600 s). The mutual alignment of the electric (E) and magnetic field (B) was changeable - parallel and perpendicular. The source of EMF was a set of two permanent magnets (magnetic field strength ranged from 80 mT to 400 mT). It was analysed the surface microstructure, composition, morphology, thickness and the mechanical properties (roughness, work of adhesion). The surface morphology and the thickness of films were observed by Scanning Electron Microscopy (SEM) and Confocal Laser Scanning Microscopy (CLSM). The elemental composition of all FeNi films was measured using Wavelength Dispersive X-Ray Fluorescence (WDXRF). The crystalographic analysis of the deposits was carried out by X-Ray Diffraction. Depending on the used substrate, modified external magnetic field orientation influenced the tribological and physio-chemical properties of the deposited layers. The diamagnetic substrates and EMF application reduced the FeNi thickness and the average crystallites size, in contrast to the paramagnetic substrate. Parallel EMF increased the value of the tribological parameters for CuZn and Ag but decreased for Al. The content of FeNi structure was rising in the case of diamagnetic substrate and the dependence was opposite on the paramagnetic substrate.
    Źródło:
    Chemistry-Didactics-Ecology-Metrology; 2023, 28, 1-2; 157-170
    2084-4506
    Pojawia się w:
    Chemistry-Didactics-Ecology-Metrology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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