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    Tytuł:
    Mechanical Properties and Fractographic Analysis of High Manganese Steels After Dynamic Deformation Tests
    Właściwości mechaniczne i fraktograficzna analiza przełomów stali wysokomanganowych po próbach dynamicznej deformacji
    Autorzy:
    Jabłońska, M. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/356686.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high manganese steels
    dynamic deformation test
    strain rate
    fracture
    stal wysokomanganowa
    odkształcenia dynamiczne
    szybkość odkształcenia
    deformacja
    Opis:
    Since few years many research centres conducting research on the development of high-manganese steels for manufacturing of parts for automotive and railway industry. Some of these steels belong to the group of AHS possessing together with high strength a great plastic elongation, and an ideal uniform work hardening behavior. The article presents the dynamic mechanical properties of two types of high manganese austenitic steel with using a flywheel machine at room temperature with strain rates between 5×102 ÷3.5×103 s-1 . It was found that the both studied steels exhibit a high sensitivity Rm to the strain rate. With increasing the strain rate from 5×102 to 3.5×103 s-1 the hardening dominates the process. The fracture analysis indicate that after dynamic test both steel is characterized by ductile fracture surfaces which indicate good plasticity of investigated steels.
    Od kilku lat wiele ośrodków badawczych prowadzi prace nad rozwojem stali wysokomanganowych przeznaczonych do produkcji części dla przemysłu samochodowego i kolejowego. Niektóre z tych stali należą do grupy nazywanej Advanced High Strength Steels, i charakteryzują się wysoką wytrzymałością przy jednocześnie bardzo dużej plastyczności i szerokim zakresie umocnienia. W niniejszej pracy przedstawiono badania właściwości mechanicznych w próbach odkształcenia dynamicznego dla dwóch gatunków wyskomanganowej stali austenitycznej z wykorzystaniem młota rotacyjnego w temperaturze pokojowej z szybkością odkształcenia między 5 x 5×102 ÷3.5×103 s-1. Stwierdzono, że badane stale wykazują wysoką czułość wytrzymałości na rozciąganie Rm na prędkość odkształcenia. Wraz ze wzrostem szybkości odkształcenia od 5×102 do 3.5×103 s-1 następuje proces umocnienia badanych stali. Przeprowadzona analiza faktograficzna przełomów wskazuje, że pękanie po próbach dynamicznej deformacji obu stali ma charakter transkrystaliczny ciągliwy co wskazuje na wysoką plastyczność badanych stali.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 3; 1193-1197
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect Of Strain Rate On The Mechanical Properties And Microstructure Of The High-Mn Steel After Dynamic Deformation Tests
    Wpływ prędkości odkształcenia na właściwości i strukturę stali wysokomanganowej po testach deformacji dynamicznej
    Autorzy:
    Jabłońska, M. B.
    Śmiglewicz, A.
    Niewielski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/958229.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-manganese steel
    dynamic deformation test
    strain rate
    impact strength
    mechanical twinning
    structure
    stal wysokomanganowa
    testy deformacji dynamicznej
    prędkość odkształcenia
    siła uderzenia
    bliźniakowanie mechaniczne
    struktura
    Opis:
    The paper presents results of dynamic tensile investigations of high-manganese Fe – 20 wt.% Mn – 3 wt.% Al – 3 wt.% Si – 0.2 wt.% steel. The research was carried out on a flywheel machine, which enables to perform dynamic tensile tests and impact bending with a linear velocity of the enforcing element in the range of 5÷40 m/s. It was found that the studied steel was characterized by very good mechanical properties. Strength of the tested materials was determined in the static tensile test and dynamic deformation test, while its hardness was measured with the Vickers hardness test method. The surface of fractures that were created in the areas where the sample was torn were analyzed. These fractures indicate the presence of transcrystalline ductile fractures. Fractographic tests were performed with the use of a scanning electron microscope. The structure was analyzed by light optical microscopy. Substructure studies revealed occurrence of mechanical twinning induced by high strain rates. A detailed analysis of the structure was performed with the use of a transmission scanning electron microscope STEM.
    W pracy przedstawiono wyniki wstępnych badań dynamicznego rozciągania wysokomanganowej stali gatunku X20MnAlSi16-3-3. Badania przeprowadzono na młocie rotacyjnym, który posiada możliwość realizacji prób dynamicznego rozciągania i udarowego zginania w zakresie prędkości liniowej elementu wymuszającego od 5÷40 m/s. Badana stal charakteryzuje się bardzo dobrymi właściwościami mechanicznymi. Wyniki badań uzyskano na podstawie statycznej próby rozciągania, próby dynamicznego rozciągania na młocie rotacyjnym oraz pomiaru twardości metodą Vickersa. Przeanalizowano powierzchnie przełomów powstałych w miejscu zerwania podczas prób rozciągania, które wskazują na obecność przełomów transkrystalicznych ciągliwych. Badania strukturalne wykonano z wykorzystaniem techniki mikroskopii świetlnej, skaningowej mikroskopii elektronowej i skaningowej transmisyjnej mikroskopii elektronowej. Przeprowadzone badania substruktury ujawniły obecność mechanizmu bliźniakowania mechanicznego, indukowanego w warunkach dużych prędkości odkształcenia.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2A; 577-580
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prognosis of environmental impact of trace elements from brown coal-fired power plant Bełchatów
    Autorzy:
    Konieczyński, J.
    Komosiński, B.
    Jabłońska, M.
    Cieślik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/204574.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    environment protection
    brown coal
    trace elements
    combustion products
    fl ue gas desulphurization (FGD) gypsum
    forecast of trace elements emission
    forecast of trace elements transfer
    Opis:
    A forecast of the negative impact exerted on the environment by selected trace elements in "Bełchatów" Power Plant has been prepared on the basis of the results of investigations into these elements’ distribution carried out as part of earlier research on coal from “Bełchatów” Field and the data on updated analyses of the content of these elements in 55 brown coal samples from test boreholes. Work in "Bełchatów" Power Plant, which is supplied with coal from "Szczerców" Field, will be accompanied by trace elements transfer. On the basis of the conducted investigations it has been found that the biosphere is most threatened by mercury emissions. As shown by the presented results of analyses and calculations, the emissions of mercury in "Bełchatów" Power Plant are low. Mercury is accumulated chiefly in gypsum produced in the FGD plant. The content of mercury in slag and ash is low.
    Źródło:
    Archives of Environmental Protection; 2012, 38, 3; 59-72
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of different methods of site preparation on natural regeneration of Pinus sylvestris in Eastern Poland
    Autorzy:
    Aleksandrowicz-Trzcinska, M.
    Drozdowski, S.
    Brzeziecki, B.
    Rutkowska, P.
    Jablonska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/41158.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    natural regeneration
    Pinus sylvestris
    Scotch pine
    seedling density
    seedling growth
    seedling quality
    soil scarification
    Polska
    Opis:
    Mechanical site preparation (MSP) is commonly used to enable forest regeneration of clear-cuts. Less intense methods may be more suitable from an environmental point of view, but such a method can result in the lack of natural regeneration. We compare the influence of three MSP methods on natural regeneration of Scots pine. The methods differ in their degree of soil disturbance. The effects of MSP by forest plough (FP), active plough (AP), and forest cutter (FC) on density, quality, and biometric parameters of one-year old seedlings were determined. The highest density of seedlings was obtained in the FP treatment (188,000 seedlings ha–1). The seedling density was significantly lower in the AP method (121,000 seedlings ha–1), and in the FC variant (36,000 seedlings ha–1). The best quality seedlings were found in the FC variant, and the worst – in the FP treatment. Most biometric parameters of seedlings did not differ by MSP method, except for the root length and root:shoot ratio. By the end of growing season, in the FP treatment, 1-year old seedlings formed a top bud more than twice as often as the seedlings from the AP and FC treatments. The FP method led to the best Scots pine natural regeneration. The results obtained in the FC variant were not as good as in the FP method, though they were still acceptable from the silvicultural point of view. The FC method was the least intensive method of site preparation, yet it is considered the most appropriate from the environmental (soil protection) point of view.
    Źródło:
    Dendrobiology; 2014, 71
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    How do differences in the nutritional and hydrological background influence phytoplankton in the Vistula Lagoon during a hot summer day?
    Autorzy:
    Kruk, M.
    Jaworska, B.
    Jablonska-Barna, I.
    Rychter, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/48109.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Źródło:
    Oceanologia; 2016, 58, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interrelation of Microstructure and Corrosion Resistance in Biodegradable Magnesium Alloys with Aluminum, Lithium and Rare Earth Additions
    Autorzy:
    Minárik, P.
    Landa, M.
    Lesná, I.
    Zemková, M.
    Jablonská, E.
    Hadzima, B.
    Janeček, M.
    Král, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402061.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    82.45.Bb
    87.85.J-
    43.40.Le
    Opis:
    The influence of equal channel angular pressing and rotary swaging on the microstructure and corrosion resistance was investigated in three magnesium alloys with the addition of aluminum, lithium and rare earth elements - AE21, AE42 and LAE442. The processing resulted in grain refinement in all cases; nevertheless, the effect on the corrosion resistance was ambiguous. A continuous increase of the polarization resistance during the gradual equal channel angular pressing was observed in the AE42 and LAE442 alloys, whereas there was almost no effect in the AE21 alloy. The rotary swaging of AE42 resulted in a decrease of polarization resistance. The increase of polarization resistance in the alloys with the higher concentration of alloying elements was caused by the combined effect of grain refinement and better dispersion of particles in the matrix thanks to shear deformation during equal channel angular pressing. In the AE42 alloy, the increase of the corrosion resistance after equal channel angular pressing was also proven by chemical analysis of the solution and acoustic emission detection. This beneficial effect was not observed when the concentration of alloying elements was lower or when the deformation mode was different from shearing.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 491-496
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tolerance of environmental bacteria to heavy metals
    Tolerancja bakterii środowiskowych na metale ciężkie
    Autorzy:
    Stachurska, X.
    Środa, B.
    Dubrowska, K.
    Jabłońska, J.
    Roszak, M.
    Karakulska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2620262.pdf
    Data publikacji:
    2020
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    microorganism
    bioremediation
    autochthonous bacteria
    soil
    heavy metal
    toxicity
    copper sulphate
    cadmium sulphate
    lead nitrate
    Źródło:
    Acta Scientiarum Polonorum. Zootechnica; 2020, 19, 2; 63-73
    1644-0714
    Pojawia się w:
    Acta Scientiarum Polonorum. Zootechnica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of menopausal hormone therapy on the levels of magnesium, zinc, lead and cadmium in post-menopausal women
    Autorzy:
    Jurczak, A.
    Brodowski, J.
    Grochans, E.
    Karakiewicz, B.
    Szkup-Jablonska, M.
    Wieder-Huszla, S.
    Mroczek, B.
    Wloszczak-Szubzda, A.
    Grzywacz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/50553.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Medycyny Wsi
    Opis:
    Introduction and objective: The level of trace elements is extremely important for the maintenance of normal functioning of the human body. The risk of disturbance of their balance increases especially dynamically during the period of menopause. The objective of the study was the effect of MHT on the levels of bioelements (Mg and Zn) in blood plasma, and toxic metals (Pb and Cd) in the whole blood in postmenopausal women. Materials and methods: The study covered 323 women at postmenopausal age from the population of the West Pomeranian Region, in whom the levels of Mg, Zn, Pb and Cd were determined. The women were divided into two groups: study and control. The study group were 152 women who used menopausal hormone therapy (MHT). The control group were 171 women who did not use MHT, and had had their final menstrual period at least one year prior to inclusion in the study. The mean age of the women examined was 56±5. Results: Significantly higher levels of the bioelements Mg, Zn were observed in women who used MHT, compared to the control group (p<0.05). The concentration of Pb in whole blood was significantly lower in the study than the control group: 16.09±7.33 μg/l and 20.18±9.01 μg/l, respectively. An elevated level of Cd in whole blood was found in both groups of women: 0.9±1.03 μg/l and 0.8±1.1 μg/l, respectively. It was noted that women who used MHT more frequently declared the presence of climacteric symptoms (p<0.05). Conclusions: 1) Higher levels of Mg and Zn were found in blood plasma of women who used MHT. 2) The mean concentration of Cd in the blood of women in both groups was similar. 3) In women who use MHT the level of Pb in whole blood was lower, compared to the rest of the women.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2013, 20, 1
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of blood lead and cadmium levels on the functioning of children with behaviour disorders in the family environment
    Autorzy:
    Szkup-Jablonska, M.
    Karakiewicz, B.
    Grochans, E.
    Jurczak, A.
    Nowak-Staz, G.
    Rotter, I.
    Prokopowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/49880.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Medycyny Wsi
    Opis:
    Introduction and objective: The developing brain of a child is extremely prone to damage resulting from exposure to harmful environmental factors, e.g. heavy metals. Intoxication of children’s organisms with lead and cadmium affects their intellectual development. Even a relatively small amount of this metal in children’s blood can lead to developmental dysfunctions. The aim of this study was to analyse the correlation between blood lead and cadmium levels in children with behaviour disorders and their functioning in the home. Material and methods: This survey-based study was conducted among 78 families with children diagnosed as having behaviour disorders. It was performed using the ADHD-Rating Scale-IV. To determine lead and cadmium levels the laboratory procedure was based on Stoppler and Brandt’s method. Results: The mean blood lead level was 19.71 μg/l and the mean blood cadmium level was 0.215μg/l. Higher blood lead levels in children correlates positively with incidences of hyperactive and impulsive behaviour in the home, as assessed by parents (p=0.048). Statistically significant effects of cadmium on children’s behaviour were not noticed. Conclusions: The effect of lead on the developing organism of a child has such behavioural consequences as attention disorders, hyperactivity and impulsive behaviour which, in turn, may interfere with children’s functioning in the home. A negative effect of cadmium on the functioning of children with behaviour disorders in the home was not proved.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2012, 19, 2
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using proton-pump inhibitors among hemodialysis patients - single academic dialysis center’s preliminary experience
    Autorzy:
    Rakowska, M.
    Brzósko, S.
    Dąbrowska, E.
    Jabłońska, E.
    Szczykowska, J.
    Prusator, P.
    Kwaśniewska, A.
    Naumnik, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1918465.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    Proton-pump inhibitors
    hemodialysis
    overuse
    side effects
    nephrology
    Opis:
    Introduction: Proton-pump inhibitors (PPIs) are a class of drugs which decrease gastric acid production, their overuse is becoming increasingly common. Purpose: The aim of this study was to evaluate medical indications for PPIs in a cohort of prevalent hemodialysis (HD) patients and their awareness about the medical effects of these drugs. Materials and methods: The study was performed in 78 HD patients enrolled in a chronic dialysis program in a single academic dialysis unit. The study was based on medical history obtained from the patients (survey about drugs they take with intention of revealing PPIs, indications for the treatment, their awareness of the mechanism of action of these drugs).Results: 46 patients (59%) took or have been taking PPIs. Almost half (49%; n=22) had no clear medical indications for the drugs. Prescription of PPIs without medical indications was more common among nephrologists (27%), when compared with gastroenterologists (5%; p<0.05). Only 29% (n=13) of patients taking PPIs were aware of the mechanism of action of the drugs. Conclusions: Results of this study reveal the problem of PPI overuse among HD patients. Gastroenterologists usually prescribed PPIs according to medical indications. Lack of patients’ knowledge about the indications for PPI therapy is overwhelming.
    Źródło:
    Progress in Health Sciences; 2017, 7(1); 39-43
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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