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    Wyświetlanie 1-13 z 13
    Tytuł:
    Finite numerical analysis of composite structure under complex loading conditions - optimal ply design of laminate
    Autorzy:
    Dębski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/246147.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    finite element method
    laminates
    strength of composite structures
    composites damage
    composites optimization
    Opis:
    The paper presents FEA numerical analysis of composite structure subjected to complex loading conditions (tension and shear). The layered structures were characterized from the standpoint of optimal selection and strength parameters. The subject of the examinations was a composite: glass fibres reinforcedpolymers-M12/26%/TVR380R-glass prepreg system (Hexcel, R-glass fibres-undirectional, M12 epoxy resin). The composite system is use in helicopter blades. It exhibits good fatigue life and hot/wet performances up to 100° C. The strength properties were investigated according to ISO and ASTM standards. The composites for the study were pro duce d by autoclave technique. The Layup-Ply method with ABAQUS/Standard program was applied as an analysis tool which was carried out the leading of calculation. It was used an incremental iterative Newton-Raphson's method in a range of nonlinear geometric. Numerical calculation was made as a part of introduction to failure analysis composite materials. The risk of laminate's damage could be estimated as a possible appearing in dangerous points of construction. There were taken four criteria: the Maximum Stress Criterion, Tsai-Hill's Criterion, tensor criterion of Tsai-Wu and Azzi-Tsai-HiU's criterion.
    Źródło:
    Journal of KONES; 2010, 17, 1; 111-115
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of thermal barrier coating on temperature and stress distribution in diesel engine
    Wpływ bariery cieplnej na rozkład temperatur i naprężeń w silniku ZS
    Autorzy:
    Hejwowski, T.
    Dębski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/245709.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    silnik ZS
    MES (metoda elementów skończonych)
    bariera cieplna
    naprężenie cieplne
    rozkład temperatur
    diesel engine
    thermal barrier coating
    FEM
    thermal stress
    temperature distribution
    Opis:
    The paper presents results of FEM investigations into the effect of thermal barrier coating (TBC) on stress and temperature distributions in the components of naturally aspirated diesel engine. Calculations were performed by means of Abaqus ver. 6.8-3 computer program. The considered coating was plasma sprayed double-layered TBC consisting 0.15 mm thick NiCrAl bond layer and 0.3 mm ZrO2-8%Y2O3 top coat. TBC reduced the maximum temperature of the cylinder head by 15K compared to uncoated metal head, increased temperature of the outlet channel by 10 K and reduced maximum temperatures in inlet and outlet valves by 2 and 1.2 K, respectively. Although maximum temperature of the pis ton head remained the same after deposition of the coating but the range of temperatures at the piston head was reduced by 23.8%. Application o f TBC considerably reduced stresses in acritical region of outlet valve- the interface of stellite hardfacing /valve. The highest thermal stresses in the TBC were in the bondcoat, which confirms the common localization of damages. Stress concentrations were also found in the metal part at the edges of TBC and at the edges of the recess machined in the piston head. The reduction of metal temperatures and thermal gradients in protected components should have some positive effect on the components' durability.
    W pracy przedstawiono rezultaty badań numerycznych wpływu powłoki typu bariery cieplnej (TBC) na rozkład temperatur i naprężeń w elementach wolnossącego silnika ZS. Obliczenia numeryczne zostały wykonane przy pomocy programu Abaqus wer. 6.8-3. Rozważano natryskaną plazmowo powlokę dwuwarstwową składającą się z warstwy podkładowej o gr. 0,15 mm i warstwy ceramicznej ZrO2-8%Y2O3 o grubości 0,3 mm. TBC obniżyła maksymalną temperaturę głowicy silnika o 15 K w porównaniu do głowicy nie pokrytej powłoką oraz obniżyła maksymalne temperatury zaworów wylotowego i dolotowego o 2 K i 1,2 K, odpowiednio. Wprawdzie maksymalna temperatura tłoka pozostała stała ale obniżył się o 23,8% zakres temperatur na powierzchni tłoka. Zastosowanie powłoki znacznie obniżyło wartość naprężeń w krytycznym miejscu zaworu wylotowego- granicy podłoża i warstwy napawanej stellitem Najwyższa wartość naprężeń TBC występowała w warstwie podkładowej co potwierdziło częstą lokalizację pęknięć. Znaleziono również koncentracje naprężeń na krawędzi TBC i krawędzi wybrania w denku tłoka. Obniżenie temperatur metalu i gradientów temperatur w pokrytych elementach powinno wydłużyć trwałość elementów.
    Źródło:
    Journal of KONES; 2009, 16, 4; 147-154
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of elicitation with sodium silicate and iron chelate on the composition and quality of fatty acids in buckwheat sprouts
    Autorzy:
    Debski, H.
    Horbowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192811.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    common buckwheat
    sprouts
    elicitation
    iron chelate
    sodium silicate
    fatty acids
    Opis:
    In laboratory experiments, the impact of elicitation with a mixture of sodium silicate and iron chelate or sodium silicate alone on fatty acid composition in sprouts of common buckwheat (Fagopyrum esculentum Moench) has been examined. Buckwheat seeds and then sprouts were soaked for 0.5 h each day over six days in an aqueous solution of the mentioned elicitors. The sprouts were grown in the light regime of 16/8 h, day/night. After seven days of germination (sprouting), the composition of fatty acids in freeze-dried and powdered sprout tissues was analyzed by gas chromatography. The results showed significant changes in the composition of fatty acids in sprouts in comparison to buckwheat seeds. The results indicate that the germination of buckwheat seeds leads to an increase in myristic (C14:0), palmitic (C16:0), stearic (C18:0) and behenic (C20:0) acid in sprouts, although the use of the elicitors, especially sodium silicate, inhibited this tendency. The sprouts of common buckwheat contained almost twice as much α-linolenic acid (C18:3) as the seeds did, and slightly less linoleic acid (C18:2). Moreover, the use of elicitors favored an increased accumulation of α-C18:3. As a result, germination drastically reduced the C18:2/a-C18:3 ratio by about 4 times, which may have a positive health effect. The buckwheat sprouts contained traces of eicosatrienoic (C20:3), eicosatetraenoic (C20:4), docosaenoic (C22:1) and docosadienoic (C22:2) acids, while their content in the seeds was between 0.6 and 2.4%. The buckwheat sprouts had a higher atherogenic (AI) and thrombogenic index (TI) and a lower health index (HI) than seeds did, but the use of elicitors inhibited this tendency.
    Źródło:
    Journal of Elementology; 2021, 26, 1; 87-96
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Postbuckling behaviour of laminated plates with a cut-out
    Autorzy:
    Falkowicz, K.
    Dębski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/102047.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    laminates
    buckling
    postbuckling
    Finite Element Method
    Opis:
    The subject of research is the numerical and experimental analysis of a thin-walled plate with the cut-out, made of the laminate and subjected to the axial compression. In order to ensure the stable plate work in the postcritical range, it need to force its work by higher flexural-torsional form of buckling. The scope of the research included nonlinear numerical analysis with Finite Element Method (FEM) and experimental verification of calculation results. For the composite material in numerical calculations, the model of orthotropic material in the flat state of tension was defined. For the mapping of the plate element coating finite elements of type SHELL was applied with a shape function of the second order to allow the mapping of the composite structure for the element thickness. The experimental research was carried out in a special grips providing the articulated support of the upper and lower edges of the plate. The deformation registration of compression structures were carried out with resistance extensometry. This allowed to define of postcritical equilibrium paths of real structure, showing the dependence of the force to displacement. The instrument used was a numerical program ABAQUS®.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 1; 186-193
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adhesive bonded hot dip zinc coated sheet and titanium sheet joint strength - numerical analysis
    Autorzy:
    Rudawska, A.
    Dębski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/248038.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    adhesive joint
    finite elements method (FEM)
    adhesive joints strength
    Opis:
    This paper describes a numerical analysis of adhesively bonded hot dip zinc coated sheet and titanium sheet and its comparison with the results of experimental tests. The study aims at presenting a comparative analysis of numerical calculation results with the results of strength test of the joints in question. Numerical simulations are an invaluable extension of experimental tests and, moreover, prove particularly useful at joint designing and analysis stages. The calculations were conducted with ABAQUS Standard software and allowed for the destructive force value obtained in experimental tests. Strength tests were conducted on single-lap adhesive joints for given structural materials; the samples were shear-loaded. The comparison of the results of experimental tests and numerical analysis led us to observe certain inconsistencies in the destructive force values, consequently providing information on the accuracy of a numerical model when compared with the actual model. Geometric model of the analysed single-lap adhesive joint, numerical model of the analysed single-lap adhesive joint, adhesive layer failure criterion description, visualisation of the analysed single-lap joint failure process, visualisation of adhesive joint failure stages of adhesive layer are presented.
    Źródło:
    Journal of KONES; 2012, 19, 1; 339-345
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of composite structures with embedded piezoelectric active elements
    Autorzy:
    Dębski, H.
    Latalski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/248153.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    composite material
    smart structure
    piezoelectricity
    numerical simulation
    PZT
    macro fibre composite transducer
    Opis:
    The paper presents a numerical simulation of active multiple layer composite beams in bending test. Within framework of performed analysis glass-epoxy and carbon-epoxy laminates with integrated piezoelectric actuators were considered. In the research macro fiber composite (MFC) type transducers exhibiting d33 effect were used. The numerical models and further calculations were done in ABAQUS/Standard FEM software. Discrete models of the considered composite beam structures were formulated according to the Layup-Ply technique. In performed tests nonlinear geometric effects corresponding to large structural deflections were taken into account. The resulting state equations were solved by means of Newton-Raphson iterative method. Finally, the findings of numerical simulations were compared to the outcomes of laboratory experiments. A very good agreement of numerical and experimental results was achieved; this confirmed the assumptions made to the numerical model and further modelling technique. Numerical model of the piezoelement, analysis of a composite beam with piezoelectric patch, numerical tests for the separated M-8503-P1 piezoelement, electric boundary conditions for the examined actuator, strain state of a glass-epoxy laminate, laboratory test-stand, numerical and laboratory experiment results are presented.
    Źródło:
    Journal of KONES; 2012, 19, 1; 51-69
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical FEM analysis for the part of composite helicopter rotor blade
    Autorzy:
    Dębski, H.
    Ostapiuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/248157.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    glass-epoxy composite
    FEM analysis
    thin-walled structure
    Opis:
    Composites are a group of materials applied more extensively in aviation constructions. Their good physicalchemical and mechanical properties, and particularly from the ratio of strength to low density give a dominant place for applying in thin- walled constructions as a load carrying-capacity structure. One of the most effort parts of the helicopter is the thin-walled structure of rotor blade. The numerical calculations are a very helpful tool for solutions and analysis of materials. In this paper was presented the preliminary analysis of the effort of composite materials. Then it was possible to identify the region where is the high risk of failure in load-carrying capacity structure. The numerical tool applied to the analysis was the ABAQUS/Standard program. The estimation of the level of effort in the composite materials in the performed studies were the maximum stress criterion, the Tsai-Hill criterion, the tensor Tsai-Wu criterion and the Azzi-Tsai-Hill criterion. The mechanical properties required for analysis were performed in the way of experiments way, according to the standard specifications for this type of materials. FEM analysis was shown the effort elements of the construction, where were the highest level of tension stresses.
    Źródło:
    Journal of KONES; 2012, 19, 1; 71-77
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of a frame to a semi low-loader
    Autorzy:
    Koszałka, G.
    Dębski, H.
    Dziurka, M.
    Kaczor, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/242123.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    FEM
    central beam
    supporting structure
    extendable semi-trailer
    heavy transport
    Opis:
    The paper presents the process of design of a frame for a semi low loader for the transportation of oversize loads, especially wheeled and tracked machines. After considering different solutions of a frame, a central beam was chosen and an initial design was developed. The initial model of the frame was analyzed with the use of FEM and was then modified. Two final versions of the frame were prepared. One of them was used in a 4 axle trailer with a load deck that can be extended in length and width to carry oversize and heavy loads. An important advantage of the trailer is its versatility and the fact that in a non-extended state it meets the regulations for standard trailers and can carry loads without a special permission. The paper focuses on the application of FEM analysis in the design of the part of the beam where highest stresses were located. A design solution for a ladder frame, a schematic image of a box-type central beam, a design solution for rear ramps, geometrical models of semitrailer frame with boundary conditions, stress distributions in a non-extended and extended frame model, a section of the rear part of the frame with sliding plates visible and a pin guide bar for blocking frame extension, stress distribution in the front part of the frame, single and double supporting rib, side wall supporting plate and stress distribution after the use of plates and one supporting rib, stress distribution after the employment of plates and two supporting ribs, stress distribution in the alternative gooseneck design, main dimensions of the semitrailer, extended semitrailer are presented in the paper.
    Źródło:
    Journal of KONES; 2011, 18, 2; 215-223
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of the response of seedlings of common buckwheat (Fagopyrum esculentum Moench) to glyphosate applied to the shoot or to the root zone
    Porównanie odpowiedzi siewek gryki zwyczajnej (Fagopyrum esculentum Moench) na glifosat stosowany na pędy lub do strefy korzeniowej
    Autorzy:
    Debski, H.
    Szwed, M.
    Koczkodaj, D.
    Klocek, J.
    Horbowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/28388.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    We examined the response of common buckwheat (Fagopyrum esculentum Moench) seedlings, as a nontarget plant, to various doses of glyphosate applied to the root zone or to the shoots. Glyphosate was used at 0.1, 0.5, and 1.0 mM concentrations. The study was conducted on seedlings grown in hydroponic cultures under controlled growth conditions. Primary root and shoot growth, anthocyanin and photosynthetic pigment contents were measured to assess the effects of exposure to glyphosate. Glyphosate applied to shoots had a considerably higher impact on the growth of primary roots and shoots of seedlings. Low glyphosate concentrations produced an increase in anthocyanin content of hypocotyls, regardless of the mode of its application. Increasing the concentration of glyphosate applied to the root zone resulted in a gradual increase in anthocyanin content in cotyledons. Our overall results show that in hydroponically grown common buckwheat seedlings, glyphosate is less phytotoxic when applied to the root zone than when applied to the shoot. Low doses of glyphosate applied to the root zone stimulate root and shoot growth and increase the anthocyanin levels in cotyledons. The phytotoxicity of glyphosate was decreased in the absence of mineral nutrients in the root zone of buckwheat seedlings.
    Wykonano badania reakcji siewek gryki zwyczajnej (Fagopyrum esculentum Moench), na glifosat, związek chemiczny z grupy fosfonianów. Preparat zastosowano w stężeniach 0,1, 0,5 i 1,0 mM na organy nadziemne lub do strefy korzeniowej. Badania przeprowadzono na roślinach uprawia- nych hydroponicznie w kontrolowanych warunkach światła i temperatury. Aby ocenić wpływ ekspozycji na glifosat wykonano pomiary wzrostu korzenia głównego i części nadziemnych oraz zawartości antocyjanów i barwników fotosyntetycznych. Glifosat stosowany na organy nadziemne miał znacznie większy wpływ hamujący na wzrost tych organów i korzenia głównego siewek gryki, niż użyty dokorzeniowo. Niskie stężenie glifosatu (0,1 mM), niezależnie od trybu jego użycia, powodowało zwiększanie zawartości antocyjanów w hipokotylu siewek gryki zwyczajnej. Podwyższanie stężenia glifosatu w strefie korzeniowej powodowało stopniowy wzrost zawartości antocyjanów w liścieniach siewek. Uzyskane wyniki ukazują, że w uprawie hydroponicznej siewek gryki zwyczajnej glifosat jest mniej fitotoksyczny po użyciu do strefy korzenia, niż po zastosowaniu na organy nadziemne. Niskie dawki glifosatu (0,1 mM) w strefie korzeniowej stymulowały wzrost korzenia głównego i części nadziemnych siewek oraz zwiększały poziom antocyjanów w liścieniach. Fitotoksyczność glifosatu ulegała obniżeniu przy braku składników mineralnych w pożywce.
    Źródło:
    Acta Agrobotanica; 2018, 71, 1
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of methyl jasmonate vapors on level of anthocyanins, biogenic amines and decarboxylases activity in seedlings of chosen vegetable species
    Wpływ par jasmonianu metylu na poziom antocyjanów, amin biogennych i aktywności dekarboksylaz w siewkach wybranych gatunków warzyw
    Autorzy:
    Horbowicz, M.
    Kosson, R.
    Sempruch, C.
    Dębski, H.
    Koczkodaj, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/11542773.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    Seedlings of four vegetable species (maize, tomato, radish and onion) were treated for 7 days with methyl jasmonate (MeJA) vapors. MeJA accelerated senescence process of plant tissues and accumulation of anthocyanins. The only exception were hypocotyls of radish, which was found to decrease of the anthocyanin content under the influence of MeJA. It has been shown that MeJA has a different impact on the content of free biogenic amines. In case of leaves and epicotyls of maize and tomato hypocotyls, MeJA had no effect on levels of putrescine (Put). The leaves of tomatoes have shown to increase the putrescine level as a result of the impact of MeJA vapors. However, in the tissues of radish and onion very large decline in putrescine and spermidine content under the influence of the phytohormone were observed. The presence of small amounts of spermine was found only in tissues of radish, and onion, which does not affect the use of MeJA. In tissues of maize the presence of a significant content of 2-phenylethylamine (PEA) were found. Use for 7 days of MeJA vapors resulted in 3-fold increase in the content of the PEA in maize leaves. Small levels of the amine has also been found in tomato hypocotyls, where use of MeJA caused reduction its content. Obtained results show a little relationship between the activity of the studied enzymes (ornithine decarboxylase (ODC), lysine decarboxylase (LDC) and tyrosine decarboxylase (TYDC)) and the contents of the amines in seedlings of four vegetable species. No free cadaverine and tyramine were found, and therefore probably both polyamines might be present as conju-gates. Putrescine also may be present in bound form. Moreover, since putrescine can be synthesized directly from ornithine or indirectly from arginine via agmatine, the activity of ODC alone did not give a full picture of the impact of MeJA on Put accumulation.
    Siewki czterech gatunków warzyw (kukurydzy, pomidora, rzodkiewki i cebuli) traktowano przez 7 dni parami jasmonianu metylu (MeJA). MeJA przyspieszyła proces starzenia tkanek roślinnych, powodując nagromadzenie antocyjanów. Jedynym wyjątkiem byá hipokotyle siewek rzodkiewki, w których stwierdzono zmniejszenie zawartości antocyjanów pod wpływem par MeJA. Wykazano, że MeJA ma zróżnicowany wpływ na zawartość amin biogennych. W przypadku liści i epikotyli kukurydzy oraz hipokotyli pomidora pary MeJA nie miały wpływ na zawartość putrescyny (Put). Z kolei liście pomidorów reagowały wzrostem poziomu putrescyny pod wpływem par MeJA. Natomiast w tkankach cebuli i rzodkiewki obserwowano bardzo duĪy spadek zawartości Put i spermidyny pod wpływem tego fitohormonu. Stwierdzone w tkankach rzodkiewki i cebuli niewielkie zawartości sperminy nie ulegały zmianom pod wpływem par MeJA. W tkankach kukurydzy wykazano obecność znacznej zawartości 2-fenyloetyloaminy (PEA). Stosowanie przez 7 dni par MeJA spowodowało 3-krotny wzrost zawartości PEA w liściach siewek tego gatunku. Niewielki poziom PEA stwierdzony w hipokotylach pomidorów ulegała obniżeniu pod wpływem MeJA. Uzyskane wyniki wskazują na mały związek pomiędzy aktywnością badanych enzymów (dekarboksylazy ornityny – ODC, dekarboksylazy lizyny – LDC i dekarboksylazy tyrozyny – TyDC) i zawartości amin w siewkach czterech badanych gatunków warzyw. W tkankach analizowanych gatunków warzyw nie stwierdzono mierzalnych poziomów kadaweryny i tyraminy, co może sugerować, że obie aminy mogą występować wyłącznie w formie związanej. ponieważ putrescyna może byü syntetyzowana bezpośrednio z ornityny lub pośrednio z argininy poprzez agmatynę, aktywność ODC nie daje pełnego obrazu wpływu MeJA na jej nagromadzanie.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2014, 13, 1; 3-15
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of fluridone on the composition of fatty acids and other properties of tomato fruits
    Autorzy:
    Goraj-Koniarska, J.
    Wiczkowski, W.
    Debski, H.
    Saniewski, M.
    Horbowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192105.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    fluridone
    tomato fruit
    fatty acids
    proline
    proteins
    MDA
    Opis:
    The effects of fluridone on the content and composition of fatty acids and some other properties of tomato fruits during a 14-day period of ripening were studied. Mature green tomato fruits were used for the experiments. Fluridone at a 1.0% concentration in lanolin paste was applied as a 2-3 mm stripe from the top to the base of a tomato fruit, and a stripe of lanolin was applied in the same way on the opposite side of the frui as control. After 14 days of the experiment, the treated (yellow) and untreated (red) halves of the tomato were separately freeze-dried and powdered before analysis. Determination of the profile and content of fatty acids was carried out in a micro-HPLC-MS/MS system including a 5600 QTOF mass spectrometer. Fatty acids were identified, based on retention times of available standards and the MS/MS spectra. The degree of lipid peroxidation, DPPH radical scavenging activity, proline and soluble protein content were determined using spectrophotometric methods. The use of fluridone did not cause significant changes in the content of unbound fatty acids, although there was a tendency to increased amounts of unsaturated acids. Concerning total fatty acids, the use of fluridone significantly increased the ratio of oleic acid to stearic, as well as the ratio of total unsaturated acids to saturated acids in the treated pericarp of tomato fruits. Fluridone had not effect on the content of proline, total phenolic acids, MDA and antioxidant activity, but inhibited soluble protein accumulation and enhanced the content of total flavonoids.
    Źródło:
    Journal of Elementology; 2020, 25, 3; 951-960
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of root-zone glyphosate exposure on growth and anthocyanins content of radish seedlings
    Autorzy:
    Grzesiuk, A.
    Dębski, H.
    Oknińska, K.
    Koczkodaj, D.
    Szwed, M.
    Horbowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/12189078.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    plant cultivation
    radish
    seedling
    root zone
    anthocyanin content
    Opis:
    The response of radish seedlings (Raphanus sativus L. subvar. radicula Pers.), as non-target plant, to various doses of glyphosate applied to root zone was studied in the experiment. The glyphosate was used at concentrations 0.1, 0.5 and 2.0 mM, and the study was conducted on seedlings grown in hydroponic cultures in controlled light and temperature conditions. In the experiment, roots of seedlings were exposed to glyphosate for 4, 7 or 14 days. In order to evaluate the effect of glyphosate, length and biomass of the seedling organs, as well as contents of anthocyanins in hypocotyls and cotyledons have been measured. Glyphosate applied to root zone had considerably higher impact on the growth of the primary root than shoot of radish seedlings. Short-term exposure to glyphosate led to the stimulation of growth and biomass organs of the radish seedling, but such treatment had no effect on the contents of anthocyanins in the cotyledons and hypocotyl. However, after longer exposure to glyphosate a decrease of anthocyanins content in the hypocotyl and its increase in the cotyledons was noted.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2018, 17, 2; 3-10
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The B-Li System. Calorimetric and Theoretical Studies
    Układ B-Li. Badania kalorymetryczne i teoretyczne
    Autorzy:
    Dębski, A.
    Braga, M. H.
    Gąsior, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/354959.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    phase diagrams
    thermodynamic and thermochemical properties
    ab initio calculations
    calorimetry
    diagram fazowy
    właściwości termodynamiczne
    właściwości termochemiczne
    badania kalorymetryczne
    Opis:
    The standard enthalpy of formation of the B78Li22 alloy was measured with the use of the water reaction calorimetric method at 25 °C (298 K). An X-ray diffraction study of the prepared sample was conducted. The obtained diffraction pattern was different from the patterns for the B3Li and B14Li3 phases. The standard enthalpy of formation obtained for the B78Li22 alloy was -39.0 ± 0.7 kJ/mole of atoms. This value corresponds well with the formation enthalpies of the phases from the boron-lithium system. Theoretical calculations of the standard enthalpy of formation were conducted for the B78Li22 alloy and the phases from B-Li system, which were investigated earlier. A discussion of the deviations observed between both sets of data (experimental and calculated) was performed. Additionally, DTA studies were performed for 14 alloys of the concentrations from 40 to 100 at. % of Li.
    Standardowa entalpia tworzenia stopu B78Li22 została zmierzona metodą kalorymetrii reakcyjnej wodnej. Próbka stopu po wyżarzaniu była poddana badaniom strukturalnym metodą dyfrakcji promieniowania rentgenowskiego. Uzyskany dyfraktogram jest inny od dyfraktogramów dla faz B3Li ora B14Li3. Zmierzona standardowa entalpia tworzenia stopu B78Li22 wyniosła -39.0 ± 0.7 kJ/mol atomów. Wartość ta dobrze koreluje z entalpią tworzenia faz z układu bor-lit. Przeprowadzone zostały również obliczenia teoretyczne standardowej entalpii tworzenia dla stopu B78Li22 oraz faz z układu B-Li, wcześniej badanych. Zaobserwowane rozbieżności między teoretycznymi i eksperymentalnymi wartościami entalpii tworzenia zostały przedyskutowane. Ponadto, wykonano pomiary DTA dla 14 stopów o stężeniach od 40 do 100 % at. Li.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 4; 2513-2520
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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