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Wyświetlanie 1-6 z 6
Tytuł:
Wpływ kopalni węgla kamiennego na jakość wody rzeki Wisły
Influence of Hard Coal Mine on Water Quality in the Vistula River
Autorzy:
Policht-Latawiec, A.
Kapica, A.
Powiązania:
https://bibliotekanauki.pl/articles/1819172.pdf
Data publikacji:
2013
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
węgiel kamienny
rzeka Wisła
jakość wód
coal mine
Vistula river
water quality
Opis:
The subject of the paper was determining the effect of supplied mine waters on the quality of the analyzed section of the Vistula River. “Silesia” Mine Enterprise (ME) which supplies the pollutants is situated in the southeastern part of the Śląskie province. Silesia ME extracts hard coal and mine gas – methane. The mine belongs to medium waterlogged mines with chloride-sodium inflowing waters. Before their discharge to the river, the mine waters are as a whole drained to the storage-dosing reservoir. Beside the retention and dosing mine waters to the Vistula River, the reservoir allows for removing the mechanical suspension from the waters.The main point of the work was acquisition of samples for analysis. Water samples were collected in 2011 from four control and measurement points along a kilometer section of the Vistula river and used for laboratory analyses. The control and measurement points were situated 20m above the discharge ditch outlet to the Vistula River and subsequently 50 and 1000 m below the discharge. The following parameters were measured immediately after water sampling: water temperature, the contents of dissolved oxygen, oxygenation capacity, pH and electrolytic conductivity. The other eighteen components were analyzed in a laboratory. Determined were: the content of total suspended solids, dissolved substances, sulphates, phosphates, total phosphorus, ammonium nitrogen, nitrite nitrogen, nitrites, nitrate nitrogen, nitrates, ammonium ion, chlorides, sodium, calcium, magnesium, total iron, potassium and manganese. The paper assessed the dynamics of water physicochemical indices, fulfilling conditions at supplying polluted water to the receiving water and functional values of water. It was stated that the Vistula waters deteriorate after introducing mine waters. They become waters below the good state, creating conditions unsuitable for fish life and unfit for water supply to people. Pollution of mine waters, regarded as treated sewage, exceeds the permissible values of some indices as stated in legal regulations. However, the key concentration of chlorides at the point of full mixing does not exceed their permissible values. River self-purification is on a good level, since mostly pollutant concentrations decrease on the length of the investigated section of the Vistula River, i.e. in point 4.
Źródło:
Rocznik Ochrona Środowiska; 2013, Tom 15, cz. 3; 2640-2651
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the influence of electrospinning process parameters on the morphology of poly(lactic acid) fibres
Autorzy:
Matysiak, W.
Kapica, A
Tański, T.
Dubiel, A.
Powiązania:
https://bibliotekanauki.pl/articles/379142.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
nanofibres
poly(lactic acid)
polylactide
PLA
electrospinning
nanowłókna
poli(kwas mlekowy)
polilaktyd
elektroprzędzenie
Opis:
Purpose: The article focuses on the production of polymer nanofibres from poly(lactic acid) using the electro-spinning method, i.e. the technique of forming fibres in an electrostatic field. The main aim of the publication was to analyse the influence of the distance between electrodes on the morphology of one-dimensional polymeric materials obtained. Design/methodology/approach: In the practical part of the study solutions of polylactide in acetone and a mixture of chloroform/dimethylformamide (DMF) were produced. After 72 hours of mixing, no homogeneous solutions were obtained, therefore a solution consisting of a polylactide dissolved in chloroform was prepared, to which dimethylformamide was added in order to dilute the mixture. The morphology of the nanostructures obtained was analysed by means of a scanning electron microscope (SEM) equipped with an X-ray energy dispersion spectrometer (EDS), which allowed to analyse the chemical composition of the nanofibres produced. The electro-spinning method used to obtain fibres is characterized by high versatility - it gives the possibility to produce fibres from a wide range of polymers. Electro-spinning is also an economic method, and spinned fibres have a wide application potential. Findings: Nanofibres obtained by electro-spinning from the previously produced solution, regardless of the distance between the nozzle and the collector (10 or 20 cm) did not show any significant discrepancies in the values of measured diameters. Fibres obtained at increased distance between electrodes (20 cm) are characterized by a smaller average diameter value, but the difference is small, fluctuating between 48-49 nm. In the case of the sample formed during electro-spinning at the distance of the nozzle - collector equal to 10 cm and the sample produced at the distance doubled, no defects in the structure of the obtained nanofibres were observed. The analysis of topographic images of surfaces produced in the course of nanostructures' work did not show any significant influence of the distance between the nozzle and collector on the diameter of fibres. No defects in the structure of one-dimensional polymer materials obtained allowed to state that the distance between the nozzle and the collector in the range of 10-20 cm is the optimal parameter of the electro-spinning process allowing to obtain smooth, untangled fibres. Practical implications: The fibrous polymer mats obtained during the electro-spinning process of polylactide can be used as protective clothing materials, as drug delivery systems, as tissue scaffolding and as filtration membranes. Originality/value: At present, there are few articles in the literature on the electrospinning process, due to the fact that it is a constantly developing matte for the production of nanofibres. Moreover, most of the research focuses on fibres obtained from nonbiodegradable polymers, which do not have the advantages of fibres obtained from polylactide.
Źródło:
Archives of Materials Science and Engineering; 2019, 96, 2; 73-78
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jakość sensoryczna i przeżywalność potencjalnie probiotycznych szczepów Lactobacillus w fermentowanym napoju miodowym
Sensory quality and viability of potentially probiotic strains of Lactobacillus in fermented honey beverage
Autorzy:
Trzaskowska, M.
Trzcinska, A.
Kapica, Z.
Powiązania:
https://bibliotekanauki.pl/articles/826183.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Technologów Żywności
Tematy:
napoje fermentowane
fermentacja
wlasciwosci probiotyczne
probiotyki
Lactobacillus
bakterie probiotyczne
ocena sensoryczna
jakosc sensoryczna
zywnosc funkcjonalna
miod
Opis:
Celem pracy było określenie możliwości zastosowania bakterii potencjalnie probiotycznych Lactobacillus johnsonii K4 lub Lactobacillus casei O12 do produkcji napoju miodowego akceptowanego sensorycznie i zawierającego żywe mikroorganizmy. Materiałem do badań były napoje miodowe przygotowane z miodu wielokwiatowego i wody wodociągowej (12,05 g/100 ml). Napoje poddano 2-, 3-, 4- i 5-dniowej fermentacji monokulturą bakterii (po inokulacji ok. 7 log jtk/cm³) w temp. 30 i 37 ºC. Średnia liczb bakterii po fermentacji zawierała się w przedziale 6,75 ÷ 8,14 log jtk/cm³. Wzrost bakterii był zależny od szczepu, czasu i temperatury fermentacji (p < 0,05). Te same czynniki istotnie wpłynęły na średnie wartości pH we wszystkich próbach w kolejnych dniach fermentacji i mieściły się w granicach 4,6 ÷ 4.8 (p < 0,05). Czas fermentacji był czynnikiem statystycznie istotnie wpływającym na ocenę sensoryczną (p < 0,05). Najwyższe noty w ocenie sensorycznej przyznano próbkom fermentowanym szczepem Lb. casei O12 przez 2 dni w temp. 37 ºC. Wybrane bakterie z rodzaju Lactobacillus można zastosować do wytwarzania innowacyjnego napoju o pożądanych cechach sensorycznych. Na tym etapie badań produkt nie może być nazwany probiotycznym, jednak jakość sensoryczna i zakres przeżywalności szczepów predysponuje do dalszej oceny ich właściwości probiotycznych.
The objective of the research study was to determine the possibility of using potentially probiotic strains of Lactobacillus johnsonii K4 and Lactobacillus casei O12 to manufacture a honey beverage having a appropriate sensory quality and containing viable microorganisms. The research material consisted of honey beverages made of multifloral honey and tap water (12.05 g/100 ml). The beverages were fermented for 2, 3, 4 and 5 days with a bacterial monoculture (after inoculation of approx. 7 log cfu/ml) at a temperature of 30 and 37 ºC. The average count of bacteria ranged from 6.75 to 8.14 log cfu/ml. The growth of bacteria depended on the strain, the time and the temperature of fermentation (p < 0.05). The same factors significantly impacted the mean pH values of all the samples on the subsequent days of fermentation; those pH values ranged between 4.6 and 4.8 (p < 0.05). The fermentation time was a factor to statistically significantly impact the sensory evaluation (p < 0.05). The samples fermented with a Lb. casei O12 strain for 2 days at 37 ºC were given the highest scores in the sensory evaluation. The selected bacteria of the Lactobacillus species can be used to manufacture an innovative beverage having desirable sensory qualities. At this stage of the research, the product cannot be called probiotic; however, the sensory quality and the range of viability of the strains predispose them to continue evaluation of their probiotic properties.
Źródło:
Żywność Nauka Technologia Jakość; 2018, 25, 1
1425-6959
Pojawia się w:
Żywność Nauka Technologia Jakość
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using the Dynamic Terrain Model for Real-Time Calculation of Extraction Volumes
Zastosowanie dynamicznego modelu terenu w celu obliczenia wydajności wydobycia w czasie rzeczywistym
Autorzy:
Vrublova, D.
Kapica, R.
Seidl, M.
Strakova, A.
Powiązania:
https://bibliotekanauki.pl/articles/971096.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
bucket wheel excavator
digital model of terrain
GNSS
GNSS MineModel
three-dimensional (3D)
volume calculating
koparka kołowa
cyfrowy model terenu
trójwymiar (3D)
obliczenia objętościowe
Opis:
Big volume of materials is mined and transported quite often during surface mining, especially in lignite mining. Calculating the volumes of extracted material is one of the primary jobs for mine surveyors. The present paper describes a system (GNSS MineModel) for real-time computing of extraction volumes by means surveying system for localization of bucket wheel of excavators.
Duża ilość materiałów jest wydobywana i transportowana dość często podczas górnictwa odkrywkowego, głównie w przypadku węgla brunatnego. Obliczenia dotyczące ilości wydobytego materiały jest jednym z głównych zadań inspektorów górnictwa. Niniejszy artykuł opisuje system (GNSS MineModel) obliczania w czasie rzeczywistym poziomu wydobycia dzięki użyciu systemu geodezyjnego do lokalizacji koparek kołowych.
Źródło:
Inżynieria Mineralna; 2014, R. 15, nr 1, 1; 1-5
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and properties of porous carbon material containing magnesium oxide
Autorzy:
Przepiórski, J.
Czyżewski, A.
Kapica, J.
Casa-Lillo, M. A. de la
Powiązania:
https://bibliotekanauki.pl/articles/779835.pdf
Data publikacji:
2011
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
węgiel porowaty
MgO
porowatość
porous carbon
porosity
Opis:
Porous carbons loaded with magnesium oxide were prepared through one-step process. Poly(ethylene terephthalate) and natural magnesite were used as carbon source and MgO precursor, respectively. An impact of a temperature and relative amounts of raw components used for preparations on the textural parameters of resulting hybrid materials is presented and discussed. As found, pore structure parameters tend to decrease along with MgO loading and temperature used during preparation process. Micropore area is the parameter being reduced primarily.
Źródło:
Polish Journal of Chemical Technology; 2011, 13, 4; 42-46
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The comparisons of blood plasma and cerebrospinal fluid S100B protein concentrations in patients with Alzheimer`s disease, amyotrophic lateral sclerosis, and multiple sclerosis
Autorzy:
Tarasiuk, J.
Kapica-Topczewska, K.
Chorąży, M.
Borowik-Zaręba, A.
Mroczko, B.
Kochanowicz, J.
Kułakowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1918848.pdf
Data publikacji:
2019-08-26
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
S100
blood
cerebrospinal fluid
Alzheimer's disease
Amyotrophic lateral sclerosis
Multiple sclerosis
Opis:
Introduction:S100 calcium-binding protein B (S100B) is a biochemical marker of astroglial damage. Purpose: To assess the pathophysiological implications of S100B concentrations in blood plasma and cerebrospinal fluid of patients with neurodegenerative central nervous system disorders. Materials and Methods: In this study, we determined and compare S100B concentrations in blood plasma and cerebrospinal fluid obtained from subjects diagnosed with Alzheimer's disease (n=20), amyotrophic lateral sclerosis (n=12), multiple sclerosis (n=40) and the reference group (n=20), using enzyme-linked immunosorbent assay. Results: Concentrations of S100B in plasma collected from patients diagnosed with Alzheimer's disease (252,38±183,50 pg/mL) and multiple sclerosis (164,92±250,14 pg/mL) were above laboratory standards, but in patients with amyotrophic lateral sclerosis (53,96±56,92 pg/mL) and the reference group (2,12 pg/mL) were below laboratory norms (N>75 pg/mL). Concentrations of S100B in plasma collected from patients with Alzheimer's disease (252,38±183,50 pg/mL) were significantly higher than in patients with amyotrophic lateral sclerosis (53,96±56,92 pg/mL) (p<0,029). Concentrations of S100B in CSF collected from the reference group (546,96±236,62 pg/mL) and from patients with Alzheimer's disease (587,53±189,57 pg/mL), amyotrophic lateral sclerosis (404,41±179,56 pg/mL), multiple sclerosis (462,03±146,01 pg/mL) were very similar, and none of pairwise comparisons reached statistical significance. Conclusions: Results of our studies indicate the importance of S100B protein concentration assessment in blood in central nervous system disorders differential diagnostics.
Źródło:
Progress in Health Sciences; 2019, 1; 22-27
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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