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    Wyświetlanie 1-6 z 6
    Tytuł:
    Lotne związki organiczne w wyrobach lakierowych – zalety i ograniczenia metod badawczych
    Volatile organic compounds in varnish products – advantages and limitations of test methods
    Autorzy:
    Gnus, Małgorzata
    Kamińska-Bach, Grażyna
    Powiązania:
    https://bibliotekanauki.pl/articles/32507020.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
    Tematy:
    lotne związki organiczne
    wyroby lakierowe
    metody badawcze
    volatile organic compounds
    varnish products
    test methods
    Opis:
    W niniejszej pracy przedstawiono stosowane obecnie metody oznaczania lotnych związków organicznych w wyrobach lakierowych: instrumentalną metodę chromatograficzną oraz wagową metodę różnicową. Oprócz charakterystyki poszczególnych technik uwagę poświęcono również na wskazanie wad i zalet każdej z nich. Podkreślono rolę komunikacji producentów z laboratoriami na etapie doboru metody analitycznej pod kątem badanego wyrobu.
    This paper presents the currently used methods for the determination of volatile organic compounds in varnish products: the instrumental chromatographic method and the differential gravimetric method. In addition to characterisation the different techniques, attention was also given to identifying the advantages and disadvantages of each. The role of communication between manufacturers and laboratories at the stage of selecting the analytical method for the tested product was emphasized.
    Źródło:
    Polimery dla Biznesu; 2023, 1; 28-32
    2720-5231
    Pojawia się w:
    Polimery dla Biznesu
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of chitosan molecular weight and degree of deacetylation on membrane physicochemical and separation properties in ethanol dehydration by the vapour permeation process
    Autorzy:
    Gnus, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/1034007.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    chitosan
    degree of deacetylation
    molecular weight
    separation properties
    vapour permeation
    Opis:
    Membranes were prepared using three chitosans with different molecular weights and degrees of deacetylation. The influence of chitosan features on membrane physicochemical properties, i.e. degree of swelling, contact angle and tensile strength, as well as membrane separation properties in ethanol dehydration by the vapour permeation process are discussed. The conducted experiments showed that an increase in the chitosan molecular weight led to an increase in the membrane surface contact angle concomitant with a decrease in the material selectivity coefficient. On the other hand, an increase in the chitosan degree of deacetylation caused a reduction in ethanol and improved the water permeate flux. There was greater selectivity in the test process for membranes prepared from chitosan with the lowest molecular weight.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2020, 25; 79-93
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Muscle torque production and kinematic properties in post-stroke patients: a pilot cross-sectional study
    Autorzy:
    Kowal, Mateusz
    Kołcz, Anna
    Dymarek, Robert
    Paprocka-Borowicz, Małgorzata
    Gnus, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/306470.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biomechanika
    parametry chodu
    neurorehabilitacja
    udar mózgu
    moment obrotowy
    biomechanics
    gait parameters
    isokinetic assessment
    neurorehabilitation
    post-stroke hemiplegia
    torque production
    Opis:
    Stroke-related hemiplegia is an important factor influencing parameters of gait. So far, limited papers have assessed temporo-spatial capabilities and their correlations with gait parameters in the early post-stroke stage. This pilot study evaluated the temporospatial parameters of gait and assessed the maximal isometric and isokinetic torque production of the plantar flexor and dorsiflexor muscles. Methods: 15 patients with lower limb spasticity and 15 healthy controls were included. Stroke severity was assessed using the Modified Ashworth Scale and the Barthel Index. Gait cadence, gait speed, and gait cycle were assessed using inertial sensors during a Timed Up and Go test. Maximal isometric and isokinetic torque production of the ankle plantar flexor and dorsiflexor muscles were assessed using an isokinetic dynamometer device. Results: Post-stroke patients had statistically significantly lower gait cadence than healthy participants (17%, p < 0.05). Statistically significantly lower values of vertical acceleration were also noted during a sit-to-stand movement task (42%, p < 0.05). Plantar flexion torque of the affected limb was significantly different during isometric (63%, p ≤ 0.01) and isokinetic work for 30o /s (49%, p = 0.04), 60o /s (58%, p = 0.01) and 20 °/s (53%, p = 0.01). Dorsiflexor muscles’ torque production was significantly different in isometric activity (38%, p = 0.04). A statistically significant positive correlation occurred between the absolute peak torque of the dorsiflexor muscles in both static and speed phases of gait (Rs = 0.65, p = 0.04). Conclusions: Despite the low intensity of spasticity and early phase after stroke, differences in the muscle torque production and temporo-spatial parameters, as well as the correlations between them, were noticeable.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 1; 11-20
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pervaporative investigation of ethyl alcohol dehydration
    Autorzy:
    Gnus, Małgorzata
    Dudek, Gabriela
    Turczyn, Roman
    Tórz, Artur
    Łącka, Dorota
    Konieczny, Krystyna
    Łapkowski, Mieczysław
    Powiązania:
    https://bibliotekanauki.pl/articles/1035004.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    alginate
    chitosan
    crosslinking
    dehydration
    pervaporation
    Opis:
    Pervaporative separation properties of crosslinked chitosan and alginate membrane on ethanol-water mixture at room temperature was studied. The influence of crosslinking agents on the separation properties were discussed. Selected crosslinking agents were affected differently on used polymer matrices. The better separation properties were obtained for membranes crosslinked by phosphoric (V) acid. The highest pervaporation separation index (309.6 kg/m2·h) and separation factor (52.6) were obtained for phosphoric (V) acid crosslinked alginate membranes, however, the greatest total flux (12.4 kg/m2·h) obtained for phosphoric acid crosslinked chitosan membranes
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2015, 20; 54-63
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The investigations on process type influence on methyl violet adsorption on chitin and chitin deacetylation products
    Autorzy:
    Tórz, Artur
    Łącka, Dorota
    Turczyn, Roman
    Gnus, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/1034871.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    adsorption
    batch process
    chitin
    chitosan
    continuous process
    Opis:
    The aim of this work was to a study various adsorption processes of methyl violet (model compound of aniline dye) on chitin and chitin deacetylation products. Two types of adsorption processes - batch and continuous - were tested. Results illustrated that raw chitin is an effective adsorbent for methyl violet and the adsorption activity of chitin deacetylation products strongly decrease with increasing degree of deacetylation (DDA). The continuous process is more effective then batch process.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2015, 20; 273-280
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vapour permeation study of water and ethanol through crosslinked chitosan and alginate membranes
    Autorzy:
    Turczyn, Roman
    Gnus, Małgorzata
    Dudek, Gabriela
    Tórz, Artur
    Łącka, Dorota
    Strzelewicz, Anna
    Łapkowski, Mieczysław
    Powiązania:
    https://bibliotekanauki.pl/articles/1034919.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    alginate
    chitosan
    crosslinking agents
    vapour permeation
    Opis:
    A vapour permeation of water and ethanol through homogenous chitosan and alginate membranes was investigated. The influence of the polymer matrix and crosslinking agents, and measurement protocol on the transport properties were discussed. The conducted experiments showed the greater separation factor, better stability and resistant to solvents for chemically crosslinked membranes. On the other hand, stronger association of the matrix, than the physical, caused decrease of vapour fluxes.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2015, 20; 281-288
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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