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Tytuł:
Microstructural and Chemical Composition Changes in the Bonding Zone of Explosively Welded Sheets
Autorzy:
Paul, H.
Miszczyk, M. M.
Gałka, A.
Chulist, R.
Szulc, Z.
Powiązania:
https://bibliotekanauki.pl/articles/352017.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
explosive welding
SEM
TEM
multilayered clads
reactive metals
amorphous phase
nano-grained phases
Opis:
In this work, the effect of heat transfer during explosive welding (EXW) and post-processing annealing on the microstructural and chemical composition changes have been thoroughly analysed using scanning and transmission electron microscopies and X-ray synchrotron radiation. Several combination of explosively welded metal compositions were studied: Ti with Al, Cu with Al, Ta or stainless steel, stainless steel with Zr or Ta and Ti with carbon steel. It was found that the melted metals exhibit a strong tendency to form brittle crystalline, nano-grained or even amorphous phases during the solidification. For all analysed metal combinations most of the phases formed in the zones of solidified melt do not appear in the equilibrium phase diagrams. Concurrently, the interfacial layers undergo severe plastic deformation forming nano-grained structures. It has been established that these heavily deformed areas can undergo dynamic recovery and recrystallization already during clad processing. This leads to the formation of new stress-free grains near the interface. In the case of low temperature and short time post processing annealing only the melted zones and severely deformed layers undergo recovery and recrystallization. However, drastic changes in the microstructure occurs at higher temperature and for longer annealing times. Applying such conditions leads to diffusion dominant processes across the interface. As a consequence continuous layers of intermetallic phases of equilibrium composition are obtained.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 683-694
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of composition changes and aeration time on the structure and rehydration of innovative freeze-dried gels
Autorzy:
Ciurzynska, A.
Pisarska, A.
Olsinski, I.
Panfiluk, A.M.
Ostap, M.S.
Lenart, A.
Powiązania:
https://bibliotekanauki.pl/articles/24190.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:
International Agrophysics; 2018, 32, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Określenie racjonalnej granicy zmian składu betonów mrozoodpornych
Determination of rational border of frost-resistant concrete composition changes
Autorzy:
Halbiniak, J.
Langier, B.
Powiązania:
https://bibliotekanauki.pl/articles/2065129.pdf
Data publikacji:
2013
Wydawca:
Politechnika Częstochowska
Tematy:
mrozoodporność
rozkład porów w betonie
domieszki
dodatki
frost resistance
distribution of air pores
additives and admixtures
Opis:
W pracy przedstawiono analizę wpływu mikrokrzemionki i domieszki napowietrzającej na mrozoodporność, nasiąkliwość i wytrzymałość na ściskanie kompozytów betonowych. Badanie mrozoodporności wykonano dla 150 cykli zamrożeń i rozmrożeń. Dla wybranych serii betonów wykonano badanie struktury porowatości stwardniałych betonów, które przeprowadzono przy użyciu urządzenia do automatycznej analizy obrazu z wykorzystaniem programu komputerowego Lucia Concrete. Wyznaczono m.in.: całkowitą zawartość powietrza w stwardniałym betonie, wskaźnik rozmieszczenia porów, zawartość mikroporów A300, oraz wykres rozkładu porów powietrznych. Wykonano oznaczenia konsystencji mieszanki betonowej oraz zawartości powietrza.
This paper presents the effects of addition of microsilica additives as well as frost resistance aeration and the characteristics of the studied concrete pores. The study was carried out for 150 frost cycles, freezing and thawing. The pore structure of concrete test was carried out using a device for automatic image analysis and utilization of the Lucia Concrete computer program. The set included: the total air content in hardened concrete, the pore distribution of the L , the contents of micropores A300, and a graph of the distribution of air pores. Furthermore, the following designations were made: the consistency and air content of the concrete mix, water absorption, resistance to compression.
Źródło:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2013, 1 (11); 26--33
2299-8535
2544-963X
Pojawia się w:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza statystycznej zmienności składu ścieków w mechaniczno-biologicznej oczyszczalni
Statistical analysis of wastewater composition changes in mechanical-biological wastewater treatment plant
Autorzy:
Płuciennik-Koropczuk, E.
Wojciech, M.
Powiązania:
https://bibliotekanauki.pl/articles/372466.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
zmiany składu ścieków
ChZT
BZT
OWO
zawiesina ogólna
statystyczne miary
wykres pudełkowy
korelacja
wastewater composition changes
COD
BOD
TOC
suspended solids
statistics measure
box-graph
correlation
Opis:
W pracy przedstawiono wyniki analizy statystycznej zmienności składu ścieków w kolejnych procesach mechaniczno-biologicznego oczyszczania. Rozkład stężeń zanieczyszczeń oraz podstawowe wartości statystyk opisowych przedstawiono za pomocą wykresów pudełkowych. Wykonano również oceny współzależności między wskaźnikami ChZTCr, BZT5 i OWO dla próbek ścieków po kolejnych procesach oczyszczania.
The paper presents the results of the statistical analysis of variability of the composition of the wastewater in the subsequent processes of treatment. Distribution of pollutant concentrations and the core values of descriptive statistics are presented in the form of graphs boxed. Also performed evaluation of the relationship between indicators COD, BOD5 and TOC in wastewater samples after subsequent treatment processes.
Źródło:
Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski; 2013, 151 (31); 131-142
1895-7323
Pojawia się w:
Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gender and age-dependent differences in body composition changes in response to cardiac rehabilitation exercise training in patients after coronary artery bypass grafting
Autorzy:
Socha, Małgorzata
Wronecki, Krzysztof
Sobiech, Krzysztof A.
Powiązania:
https://bibliotekanauki.pl/articles/990842.pdf
Data publikacji:
2017
Wydawca:
Instytut Medycyny Wsi
Tematy:
coronary heart disease
cardiac rehabilitation
body composition
eldelry
Opis:
Cardiac rehabilitation (CR) is the standard procedure in persons after coronary artery bypass grafting (CABG). Its basic aim is to combat coronary heart disease (CHD) risk factors through physical activity and normalization of body mass. Many authors highlight the differences in response to training in CR as dependent on gender, age and occurrence of accompanying disease. The aim of this study is to assess the effectiveness of a three-week early CR in reference to changing body composition parameters in patients over 50 years of age. The study involved a random group of 65 patients (44 men and 21 women) between the ages of 50–76 (average: 62.6 ± 7.2) years with CHD following CABG. Anthropometric and body composition (bioelectrical impedance method) measurements were taken at the commencement of CR and after the training programme. After CR, body mass and body mass index were reduced in men < 65 and ≥ 65 years, and in women < 65 years. A reduction % body fat and increase % fat free mass and % total body water was observed only in patients < 65. years. Furthermore, in men < 65 years, an increase in % body cell mass was observed. In women ≥ 65 years, no statistically significant changes were observed in body fat indices and body composition features between initial and final study. Patients ≥ 65 years of age following surgery over a period of hospital cardiac rehabilitation do not experience the same significant improvement in body composition parameters associated with risk of CHD as middle-aged adults. Older women post-cardiac surgery are characterized by a higher disability index in relation to tolerance to physical stress in comparison with men of the same age and persons < 65 years of age.
Źródło:
Annals of Agricultural and Environmental Medicine; 2017, 24, 3
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of depth chemical composition changes by the means of XPS/ESCA
Badanie zmian składu chemicznego materiałów za pomocą techniki XPS/ESCA
Autorzy:
Bednarska, A.
Powiązania:
https://bibliotekanauki.pl/articles/258019.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
XPS
binding energy
XPS spectrum
sputtering
concentration of elements
energia wiązania
widmo XPS
stężenie pierwiastków
Opis:
X-ray photoelectron spectroscopy (XPS) is a dedicated surface characterisation spectroscopy. It reveals which chemical elements are present at the surface, it informs us about the chemical bound nature which exists between these elements. An appropriate data processing leads to the specimen elemental composition. A sample of steel disc was prepared by ball on disc tribology test. The test was conducted in the presence of lubricant containing fluoride. The surface of steel disc was examined by means of XPS technique, and its chemical composition was determined accordingly to location of photoelectron peaks on the binding energy axis on XPS spectra. Depth profiling after 9 sputtering cycles was also conducted.
Rentgenowska spektroskopia fotoelektronowa jest techniką analizy powierzchni. Polega na analizie rozkładu energii kinetycznej fotoelektronów emitowanych w wyniku wzbudzenia próbki charakterystycznym promieniowaniem rentgenowskim. Pozwala na uzyskanie informacji o obecnych pierwiastkach oraz o wzajemnej relacji poszczególnych wiązań chemicznych. Do badania wykorzystano stalową próbkę w postaci dysku po tribologicznym teście ball-on-disc, który został przeprowadzony w środowisku smaru zawierającego związki fluoru. Powierzchnia stalowego dysku została przebadana za pomocą techniki XPS, a skład chemiczny został ustalony na podstawie położenia pików fotoelektronowych na osi energii wiązania na widmach XPS. Przeprowadzono również analizę wgłębną po 9 cyklach sputteringu za pomocą jonów Ar+.
Źródło:
Problemy Eksploatacji; 2013, 3; 169-179
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obraz "Ruiny willi rzymskiej" Henryka Siemiradzkiego w świetle ostatnich badań
The picture Ruins of a Roman Villa by Henryk Siemiradzki in the light of the recent examination
Autorzy:
Sarkowicz, Dominika
Powiązania:
https://bibliotekanauki.pl/articles/535850.pdf
Data publikacji:
2015
Wydawca:
Narodowy Instytut Dziedzictwa
Tematy:
Siemiradzki
badania
technologia
zmiany kompozycji
warsztat malarski
datowanie
research
technology
composition changes
painter’s workshop
dating
Opis:
Henryk Siemiradzki is well known to a wide audience mainly for his biblical and genre scenes from the ancient Rome depicted against Italian sunny landscapes, as well as for his leading masterpiece, Nero’s Torches. The romantic and nocturne sceneries are present in his pictures quite rarely. These kind of paintings gained less popularity among buyers as they were not so easy and nice in perception. The picture Ruins of a Roman Villa belongs to this group. From the very beginning, this painting was important for the artist and his work. The precise examination of the picture based on the use of modern analytical spectroscopic techniques, analytical photography, visual analysis and the investigation in the archives shed new light on the creation process and allowed us to complete the quest for the comprehensive knowledge of the painting’s technology and technique. Thanks to the analytical photography in the X-ray and infrared radiation, some significant changes of the author’s concept have been discovered. The content and the character of the initial painting’s layer turned out to be analogous to some other Siemiradzki’s works, which allowed us to determine with more certainty the time of the creation of this unsigned and undated painting. The palette used by the painter in this work has been identified. We have also determined the method of binding paints in the picture. The performed analysis of the painting’s technique and of the method of preparing the support and the remaining evidence of the picture’s history contribute to the data base which supports authentication of other, (sometimes uncertain) works attributed to Siemiradzki.
Źródło:
Ochrona Zabytków; 2015, 1; 141-151
0029-8247
Pojawia się w:
Ochrona Zabytków
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concept of computational model of charge composition changes in the cylinder during the gas exchange process
Koncepcja modelu obliczeniowego zmian składu ładunku w cylindrze w okresie wymiany ładunku
Autorzy:
Danilecki, K.
Powiązania:
https://bibliotekanauki.pl/articles/263649.pdf
Data publikacji:
2007
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
cylinder
model obliczeniowy
silnik tłokowy
wymiana ładunku
computational model
gas exchange process
piston engine
Opis:
A proposal of calculations of the gas exchange process in the CI piston engine has been presented that takes into account changes of chemical composition of the charge resulting from backflows and mixing of air with exhaust gases.
W artykule przedstawiono propozycję obliczeń procesu wymiany ładunku w tłokowym silniku ZS uwzględniającą zmiany składu chemicznego ładunku wynikające z przepływów zwrotnych oraz wymieszania powietrza ze spalinami.
Źródło:
Archiwum Motoryzacji; 2007, 4; 309-320
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of natural and anthropogenic factors on the chemical composition of shallow groundwater in the city of Wrocław, south-west Poland
Autorzy:
Trałka, Marta
Błachowicz, Marek
Buczyński, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/2204365.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
groundwater pollution
groundwater chemical composition changes
factor analysis
urban areas
zanieczyszczenie wód gruntowych
zmiany składu chemicznego wód podziemnych
analiza czynników
obszary miejskie
Opis:
Seen in the light of increasing anthropogenic impacts on the environment and a growing demand for potable water, pollution of groundwater is a very important issue, especially in large city areas. The present research includes analyses ofthe chemical composition at 109 measuring points in the Wrocław area, and of the spatial distribution of groundwater components with regard to land use, geological structure and hydrogeological conditions. Based on spatial analyses, it has been noted that changes depend mainly on land use and the kind of activity carried out in close proximity of water intake. Shallow groundwater in Wrocław is characterised by a great variability of main components. Factor analysis has made it possible to distinguish these components and determine the degree of their influence on the chemical composition of shallow groundwater in the entire study area. The current research demonstrates the high sensitivity of aquifers to pollution and emphasises the role of human activity in levels of groundwater pollution in urban areas.
Źródło:
Geologos; 2022, 28, 3; 191--202
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of 12-week-long Nordic Walking Exercise on Body Composition, Changes in Lipid and Carbohydrate Metabolism Indices, Concentration of Selected Adipokines and Calcidiol in Healthy Middle-aged Women
Autorzy:
Tota, Łukasz
Pilch, Wanda
Piotrowska, Anna
Pałka, Tomasz
Pilch, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/1055121.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
exercise biochemistry
health-related training
middle-aged women
nordic walking
Opis:
Research objective. This study aimed at analysing the changes in the level of somatic indicators, the secretion profile of selected adipokines, carbohydrate and lipid metabolism indices and calcidiol concentration after a 12-week-long nordic walking (NW) exercise in middle-aged women. Research material and methods. The study included 13 women aged 45.5±4.2 years who participated in a 12-week-long NW exercise, 3 times a week, 90 minutes each. Each of the women had individually determined workout intensity zones which were monitored based on the heart rate. Prior to the exercise programme and after it, somatic traits were assessed and blood was sampled in order to make biochemical analyses. Results. In the examined women, a decrease in mean body weight by 2.5 kg and a reduction in fat mass (FM), on average by 3.8 kg (i.e. 4.6%), coupled with an increase in lean body mass (LBM) by 1.3 kg, were observed after 36 workout units. A significant decrease in TC, LDL-C and TG concentrations and no changes in HDL-C concentration occurred after the exercise, which contributed to lowered atherogenic index of plasma (AIP) and atherosclerosis risk index (ARI). Conclusions. Individualised and regular physical activity in the form of NW had a protective effect on the body, resulting in improved body composition, adiponectin secretion profile, lipid and carbohydrate metabolism, and calcidiol concentration in middle-aged women.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2017, 20, 4; 69-80
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ zaniechania rolniczego użytkowania zbiorowisk trawiastych obiektu Bezledy na zmiany w ich składzie gatunkowym
Effect of desist from agriculture use of grass communities in Bezledy object on flora species composition changes
Autorzy:
Grzegorczyk, S.
Grabowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/75923.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Łąkarskie
Tematy:
torfowiska niskie
torfowiska zmeliorowane
obiekt Bezledy
zbiorowiska trawiaste
laki
zaprzestanie uzytkowania
sklad gatunkowy
sukcesja roslin
sukcesja degradacyjna
Źródło:
Łąkarstwo w Polsce; 2010, 13
1506-5162
Pojawia się w:
Łąkarstwo w Polsce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influences of Production Method and Minor Chemical Composition Changes on the Microstructure of the Alloy: $Fe_{62-x} Co_{10} Y_8 Mo_x B_{20}$ (where x=1 or 2)
Autorzy:
Nabiałek, M.
Garus, S.
Powiązania:
https://bibliotekanauki.pl/articles/1398367.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.-y
75.50.Kj
75.30.Ds
75.20.En
75.47.Np
75.50.Bb
75.60.Ej
Opis:
In this work, the results of studies concerning the structure of polycrystalline and amorphous alloys are presented. The samples were produced in a single-step production process, using two different production methods, and under a protective argon atmosphere. The quenching speed of the molten alloy was different for each of the production methods. Samples were subjected to analysis using X-ray diffractometry, scanning electron microscopy, and computer tomography. It has been shown that the samples manufactured with a higher cooling rate feature an amorphous structure; On the other hand, the samples obtained using the method with the lower cooling speed consist of crystallites of three crystalline phases with sizes of the order of μm. The amorphous samples exhibited a varied fracture surface as well as an increase in the contribution of pores to their volume, in comparison to the samples obtained at the lower cooling speed.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1010-1012
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decreased erythrocyte ghost membrane fluidity as a result of lipid composition changes in plasma of adult Insulin-dependent diabetics
Obniżona płynność błon arytrocytarnych jako wynik zmian ilościowych lipidów osocza w cukrzycy insulnozależnej u ludzi dorosłych
Autorzy:
Watała, Cezary
Bryszewska, Maria
Leyko, Wanda
Powiązania:
https://bibliotekanauki.pl/articles/945083.pdf
Data publikacji:
1986
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Źródło:
Acta Universitatis Lodziensis. Folia Biochimica et Biophysica; 1986, 5
0208-614X
Pojawia się w:
Acta Universitatis Lodziensis. Folia Biochimica et Biophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza trendów zmian składu chemicznego wód leczniczych z ujęcia b-13 w Busku-Zdroju z wykorzystaniem programu GWSDAT
Analysis of trends in chemical composition changes of curative water from B-13 intake (Busko-Zdrój region) with the use of GWSDAT software
Autorzy:
Wątor, K.
Kmiecik, E.
Powiązania:
https://bibliotekanauki.pl/articles/2075252.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
woda lecznicza
analiza trendów
oprogramowanie GWSDAT
curative water
trend analysis
GWSDAT software
Opis:
Curative water is the groundwater characterized by natural variation of physical and chemical parameters (Ustawa, 2011). Curative character valuation for natural resource (including curative water) should be made on the basis of documented investigations continuing at least three years (Rozporządzenie, 2006). Analysis of stability of chemical composition should also involve trend analysis. When trend is detected it could threaten the loss of the curative properties of water. In this paper authors present analysis of trends in chemical composition of therapeutic water from B-13 Anna intake (Busko-Zdrój region). The type of these water is chloridesodium, sulfide, iodide [Cl–Na, H2S, I]. The 33 results of chemical composition analysis were used in trend analysis. All these analysis were performed in years 1983–2012. Trend analysis was performed with use of GWSDAT software (Jones & Spence, 2013).
Źródło:
Przegląd Geologiczny; 2015, 63, 10/2; 1125--1130
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanochemical Reduction of Chalcopyrite CuFeS₂: Changes in Composition and Magnetic Properties
Autorzy:
Baláž, P.
Zorkovská, A.
Baláž, M.
Kováč, J.
Tešinský, M.
Osserov, T.
Guseynova, G.
Ketegenov, T.
Powiązania:
https://bibliotekanauki.pl/articles/1032642.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
81.05.Hd
Opis:
High-energy milling of sulphides with a reactive metal in so-called mechanochemical reduction mode can lead to products in nanorange and to composition which simplifies the following metallurgical processing. Chalcopyrite CuFeS₂, a ternary semiconductor with antiferromagnetic properties represents promising candidate as an advanced material for use in inexpensive nanoelectronics (solar cells, magnetic area), as well as copper ore source in metallurgical operations. In this work, the process of mechanochemical reduction of chalcopyrite with elemental iron is studied. The composition and properties of nanopowder prepared by high-energy milling were analyzed by X-ray diffraction and magnetic measurements. Most of the reaction takes place during 30 min with chalcocite Cu₂S and troilite FeS as the only reaction products. The magnetic investigations reveal significant increase of saturation magnetization as a result of milling. Unlike the conventional high-temperature reduction of chalcopyrite, the mechanochemical reduction is fast and ambient temperature and atmospheric pressure are sufficient for its propagation.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1165-1167
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of Changes in Microbiological Composition of Stored Sediments
Autorzy:
Sałata, A.
Stoińska, R.
Dąbek, L.
Powiązania:
https://bibliotekanauki.pl/articles/125293.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
sediments
stormwater treatment plant
microbiological analysis
Opis:
The composition of the sediments formed in the process of stormwater pretreatment is diversified and depends on many parameters, mainly on the quality of stormwater and the land use of the catchment. The stormwater sediments are characterized by heterogeneous chemical and microbiological composition. The aim of this paper was the microbiological evaluation of the sediments from four stormwater catchments in terms of hazard to humans and the environment. The pH, and the content of organic and mineral matter were determined for the examined sediments. The microbiological analysis included the determination of the total number of psychrophilic, mesophilic, and coliform bacteria, including E. coli, and also the number of faecal Enterococci, Salmonella and Shigella. The study was conducted for fresh deposits and those stored for one year in order to determine the dynamics of changes in their biological activity.
Źródło:
Journal of Ecological Engineering; 2018, 19, 6; 241-246
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The characteristics of fruits morphology, chemical composition and colour changes in must during maceration of three grapevine cultivars
Autorzy:
Ochmian, I.
Angelov, L.
Chelpinski, P.
Stalev, B.
Rozwarski, R.
Dobrowolska, A.
Powiązania:
https://bibliotekanauki.pl/articles/2172.pdf
Data publikacji:
2013
Wydawca:
Instytut Ogrodnictwa
Tematy:
fruit morphology
chemical composition
colour change
must
maceration
grape-vine cultivar
Mavrud cultivar
Pinot Noir cultivar
Merlot cultivar
yield parameter
Źródło:
Journal of Horticultural Research; 2013, 21, 1
2300-5009
Pojawia się w:
Journal of Horticultural Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An effect of mammary gland infection caused by Streptococcus uberis on composition and physicochemical changes of cows’ milk
Autorzy:
Pecka-Kielb, E.
Vasil, M.
Zachwieja, A.
Zawadzki, W.
Elecko, J.
Zigo, F.
Illek, J.
Farkasova, Z.
Powiązania:
https://bibliotekanauki.pl/articles/31243.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
An effect of mammary gland infection caused by Streptococcus uberis on the changes in cows’ milk composition and its physicochemical properties was examined. The study was conducted in the herd of Slovak Pied breed cattle (with a share of HF blood), in 2nd and 3rd lactation, after 4th month of milking. Milk samples were collected from a quarter milking. The samples were subjected to microbiological analysis, basic milk composition, total bacteria count, somatic cell count and physicochemical properties were examined. Also analyses of protein fractions share and fatty acids profile were conducted. An effect of bacterial infection of the mammary gland bring an increase (P<0.01) in somatic cell count was observed in this study. Milk samples contaminated with S. uberis were characterized by higher (P<0.05) total bacteria count and total protein compared to milk samples collected from non-infected mammary gland. The level of κ-casein was significantly (P<0.05) decreased in cows with subclinical mastitis caused by S. uberis. Significant (P<0.05) reduction in the share of C13:0 acid, and an increased level of C18:0, C18:1n7t and CLA were observed in milk contaminated with S. uberis compared to healthy cows’ milk. It should be concluded that S. uberis causes the increase in total bacteria count, SCC and the decrease in κ-casein level, which significantly affects deterioration of technological quality of cows’ milk.
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of udder infections with Staphylococcus xylosus and Staphylococcus warneri on the composition and physicochemical changes in cows milk
Autorzy:
Vasil, M.
Pecka-Kielb, E.
Elecko, J.
Zachwieja, A.
Zawadzki, W.
Zigo, F.
Illek, J.
Farkasova, Z.
Powiązania:
https://bibliotekanauki.pl/articles/32101.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The aim of this study was an evaluation of the effects of two species of coagulase negative staphylococci (CNS), Staphylococcus xylosus and Staphylococcus warneri, on the changes in technological parameters of cows’ milk. The study was conducted in a herd of Slovak Pied cattle breed (with share of HF blood). Based on the performance results from three subsequent months, cows in the 2nd and 3rd lactation with SCC up to 200 thousand/ml (8 heads, 32 quarters), and above 800 thousand/ml (8 heads, 32 quarters), after the 4th month of lactation, were selected. The samples were subjected to microbiological analysis, total bacteria count, somatic cell count; basic milk composition and physicochemical properties were also examined. The research has found the impact of bacterial infection on the increasing (p<0.05) of the number of somatic cells and a decrease (p<0.01) in protein levels in milk due to both types of staphylococci. There was a significant (p<0.05) reduction in C8: 0, C10: 0 and the total amount of saturated fatty acids in the milk of the infected cows in comparison to the healthy ones. The research also revealed higher (p<0.01) levels of C14: 0 and C20: 1 in milk from the healthy cows.
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of changes in composition of exchange price index shares of listed Polish companies
Autorzy:
Wańczyk, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/949101.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
stock market index
Stock Exchange in Warsaw
capital market
investment strategy
Opis:
The aim of the article is to analyse the change in the quotations of Polish listed companies, which change the stock exchange index as part of the periodic change in the composition of the WIG20, mWIG40 and sWIG80 stock market indices. The research methodology uses abnormal return (AR) based on daily logarithmic rates of return of Polish listed companies and daily logarithmic rates of return on the stock market indices (WIG20, mWIG40, sWIG80). In this way, they defined the relative strength of listed shares in relation to the stock indices revision a month before the composition of the stock index, when the drawn up list of companies is changing the composition of the index. In addition, the relative strength of quoted shares in relation to stock exchange indices after the revision of the composition of the stock exchange index in the short-term (one month) and medium-term perspective (six months) was examined. The research was based on quarterly changes in the composition of stock exchange indices in the years 2010-2015. The analyses carried out indicate the existence of positive surplus stock returns a month before the change in the stock index. The average number of quotes of these companies above the stock market index at the time amounted to +0.52 percentage points. In turn, the average increase in the prices of the debuting companies in the new stock exchange index within 6 months after their flotation it amounted to +0.97 percentage points over the benchmark (WIG20, mWIG40, sWIG80).
Źródło:
Financial Sciences. Nauki o Finansach; 2018, 23, 3; 111-121
2080-5993
2449-9811
Pojawia się w:
Financial Sciences. Nauki o Finansach
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in species composition of the genus Gammarus Fabr. in Puck Bay
Autorzy:
Jeczmien, W.
Szaniawska, A.
Powiązania:
https://bibliotekanauki.pl/articles/47726.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
species composition
oxygen saturation
Gammarus locusta
Gammarus inequicauda
Gammarus zaddachi
Amphipoda
Gammarus duebeni
Gammarus salinus
temperature
Gammarus oceanicus
Gammaridae
Puck Bay
salinity
Gammarus
Opis:
This paper describes the current species composition of the genus Gammarus in Puck Bay (western Gulf of Gdańsk, Poland).Sa mples were taken at 9 shallow (ca 0.4 m deep) and 4 deeper (ca 10 m) stations from April 1997 to March 1998. Six Gammarus species were recorded. Gammarus salinus was the most numerous, making up 34.95% of the total of identified amphipod specimens. This species was common throughout the bay but rarely predominant. G. zaddachi (34.75%) was dominant in the northern part of the bay from January to April and was found in almost 2/3 of samples.Less numerous were G. oceanicus (19.15%), common in the southern and eastern parts of Puck Bay, and G. duebeni (9.85%), prevalent in shallow and rocky locations. G. inequicauda and G. locusta made up only 1.13% and 0.12% of the total amphipod material respectively. The species composition of the genus varied considerably not only from one sampling locality to another but also from season to season.I t is possible that two species (G. locusta and G. inequicauda) are currently withdrawing from Puck Bay.
Źródło:
Oceanologia; 2000, 42, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulations of the influence of changes in waste composition on their energetic properties
Autorzy:
Marczak, H.
Powiązania:
https://bibliotekanauki.pl/articles/125099.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
waste management municipal waste
recycling
calorific value of waste
Opis:
The objective to obtain the recommended (at least 50% by weight) level of recycled and reprocessed raw fractions of municipal waste in the perspective of 2020 might in turn contribute to the deterioration of the fuel properties of waste stream that is intended for incineration. In order to avoid oversizing heat recovery plants their con-struction should be based on well-defined properties of the waste fuel. The author carried out simulation calculations of the impact of changes in the composition of municipal waste on their energetic properties. The calculations of the calorific value of the waste fraction (so called combustible fraction) with the potential to be used as an alternative fuel were done.
Źródło:
Journal of Ecological Engineering; 2014, 15, 4; 90-97
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Raised bog peat humic acid elemental composition: trends of changes and related factors
Kierunki oraz czynniki regulujące skład pierwiastkowy kwasu humusowego torfowiska wysokiego
Autorzy:
Dudare, D.
Klavins, M.
Powiązania:
https://bibliotekanauki.pl/articles/906305.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Opis:
Peat deposits can be considered as archives of environmental changes and indicators of anthropogenic pollution. The character of element accumulation, the potential of metal ions to bind functional groups in the peat structure, the pH reaction, the presence of oxygen, the complexing compounds and inorganic ions are the main factors governing peat ability to accumulate major and trace elements. The aim of this paper has been to study the major and trace element accumulation in humic acids (HAs) in two well-characterized ombrotrophic peat profiles of Eipurs Bog and Dzelve Bog in Latvia and analyse factors affecting the element concentrations in HAs with reference to peat properties. The analysis of major elements (e.g., Ca, Fe, K, Mg, Na) and trace elements (e.g., As, Cd, Co, Cr, Cu, Ni, Pb, Se, Zn) was performed by total reflection X-ray fluorescence spectrometry. Thise c paper demonstrates that HAs are significant for several elements, however, they are not the dominant factor affecting the element accumulation. The concentration of trace elements in peat and in peat HAs depend not only on human-induced pollution (determining elevated concentrations of trace elements in upper layers of the bog). The study has revealed that for the accumulation of several toxic trace elements in peat (for instance, As, Pb and others) natural processes are of key importance.
Źródło:
Polish Journal of Soil Science; 2012, 45, 2
0079-2985
Pojawia się w:
Polish Journal of Soil Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of archival borehole data to recognizing the primary mineral composition and diagenetic changes in Jurassic sandy rocks of the Polish Basin
Autorzy:
Wróblewska, Sara Marlena
Powiązania:
https://bibliotekanauki.pl/articles/2201221.pdf
Data publikacji:
2022
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
petrofacies analysis
Jurassic sandstones
resistivity log
gamma ray log
spontaneous potential log
Opis:
With emphasis being placed on the re-examining of mature petroleum basins and reduction of the negative impact of the industry on the environment, the use of archival data in geological exploration is essential. This is especially important in regions where the old, Soviet-type tools were used in the past and which are now using modern, western logging equipment. The application of archival geological, geochemical and geophysical data allows recognition of reservoir formations without the use of modern measurements. For the purpose of this research, Jurassic sandy rocks identified in the archival borehole Z-GN4 were analysed. They appear to be a perfect target for further petroleum and geothermal exploration in the Polish Basin; however, variable mineral composition and diagenetic features can cause difficulties while estimating their reservoir properties. The difference between gamma ray and spontaneous potential shale volume parameter (clay difference) was applied together with gamma ray measurement to determine the impact of primary and diagenetic features on each sandy petrofacies. Based on an integration of detailed petrographic analysis of available core samples from Z-GN4 borehole with archival borehole logs, four different sandy petrofacies were distinguished. Moreover, deep resistivity and sonic logs were used to highlight the carbonate-cemented intervals. This study shows how the application of petrofacies analysis in archival datasets can support the interpretation of uncored intervals and upgrade the level of reservoir characterization.
Źródło:
Geological Quarterly; 2022, 66, 3; art. no. 24
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 191

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