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Wyświetlanie 1-15 z 89
Tytuł:
Analysis of the surface geometry of the orthodontic archwire and their influence on the bacterial adhesion
Autorzy:
Ziębowicz, B.
Woźniak, A.
Ziębowicz, A.
Ziembińska-Buczyńska, A.
Powiązania:
https://bibliotekanauki.pl/articles/366963.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
archwires
b-Ti
AFM
atomic force microscope
SEM/EDS
confocal microscopy
pitting corrosion
łuk ortodontyczny
mikroskop sił atomowych
mikroskopia konfokalna
korozja wżerowa
Opis:
Purpose: The aim of this work is to characterize the surface geometry of the orthodontic archiwire and their influence of the pitting corrosion resistance and bacterial adhesion. Design/methodology/approach: In the paper, the results of the SEM/EDS analysis and microscopic observation of the samples surface and analysis of geometrical structure with the use Atomic Force Microscope (AFM) and Confocal Microscopy were presented as well as the pitting corrosion test and surface roughness and microhardness measurements were performed. Additionally the microbiological study after bacterial breeding with the use Scanning Electron Microscope was carried out. Findings: In the basis of the investigation, it can be concluded that the surface geometry of archwire has a significant impact on their pitting corrosion resistance in artificial saliva solution and on the bacterial adhesion. The obtained results show satisfactory properties and surface geometry of the tested orthodontic wires for use in the human oral environment. Research limitations/implications: In the future, it is planned to extend the research with physicochemical properties and the influence of oral hygiene products on the corrosive behaviour of the material. Limitations in the conducted tests refer to archwire design – a small diameter making measurements difficult. Practical implications: The oral environment is an extremely aggressive corrosive environment. The orthodontic elements should have very good corrosion resistance and biocompatibility. The focus should be on continuously improving orthodontic wires in terms of material quality and topography of its surface topography. Originality/value: The research is conducted in the field of biomedical engineering, which is part of material engineering and is used for the field of dentistry and microbiology.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2019, 93, 1-2; 32-40
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Operacyjne leczenie złamania kości za pomocą drutów Kirschnera u młodego kota
Operative treatment of bone fracture with Kirschner wires - young cat case
Autorzy:
Ziąbka, M.
Derkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/284222.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
druty Kirschnera
implanty do osteosyntezy
analiza RTG
analiza SEM-EDS
Kirschner wires
implants for osteosynthesis
RTG analysis
SEM-EDS analysis
Opis:
W pracy przedstawiono technikę stabilizacji złuszczonej nasady dalszej kości promieniowej i złamanie przynasadowe dalsze kości łokciowej u dziesięciomiesięcznego kota rasy europejskiej za pomocą drutów Kirschnera. Wykonano diagnostykę obrazową metodą rentgenograficzną przed i po zaimplantowaniu drutów. Na podstawie badania rentgenowskiego postawiono diagnozę: kilkudniowe złuszczenie nasady dalszej kości promieniowej lewej i złamanie wyrostka rylcowatego kości łokciowej. Kot został poddany sedacji, a następnie narkozie wziewnej. Przeprowadzono zabieg operacyjny polegający na stabilizacji kości promieniowej za pomocą drutów Kirschnera stosując ułożenie na krzyż przechodzące przez nasadę dalszą i istotę korową kości promieniowej. Kończyna została zabandażowana i usztywniona na okres 4 tygodni. Po miesiącu przeprowadzono zabieg reoperacji mający na celu usunięcie wszczepów. Następnie przy użyciu skaningowego mikroskopu elektronowego i spektrometru dyspersji energii promieniowania X (SEM-EDX) przeprowadzono obserwacje mikrostrukturalne i analizę chemiczną EDS w mikroobszarach implantów. Przeprowadzone badania RTG wykazały poprawne nastawienie kości i całkowite jej zrośnięcie po 4 tygodniach od operacji. Analiza SEM-EDS wykazała brak śladów korozji drutów Kirschnera oraz brak obecności niklu w tkankach otaczających implanty. Przez cały czas rehabilitacji zastosowana stabilizacja zapewniła kotu normalne funkcjonowanie, bez znacznego dyskomfortu.
This case study shows a cross pin technique of treating an epiphyseal fracture using the Kirschner wires in the case of a ten-month old European cat. The radiological diagnosis was performed both before and after the implantation. The radiological diagnosis proved a few day epiphyseal exfoliation of the left distal radius and the epiphyseal fracture of the distal ulna. The cat was sedated and subjected to general anesthesia. An operation was performed to stabilize the radius with the Kirschner wires, using the cross pin technique going through the distal epiphyseal and the cortical bone of the radius. The limb was immobilised for 4 weeks. After one month the reoperation was performed to remove the Kirschner wires. The microstructure of the implanted wires was observed using the scanning electron microscope equipped with X-ray energy dispersion spectrometer (SEM-EDS). The chemical analysis in the area around the operated tissue was performed. The radiological analysis showed the proper bone adjustment and its complete healing after 4 weeks after the surgery. The SEM-EDS analysis revealed no corrosion of the wire and lack of nickel in the tissues surrounding the implants. Throughout the rehabilitation the applied stabilization assured the cat the ordinary living conditions without noticeable discomfort.
Źródło:
Engineering of Biomaterials; 2017, 20, 141; 20-27
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of lithium nitrate on the reaction between opal aggregate and sodium and potassium hydroxides in concrete over a long period of time
Autorzy:
Zapała-Sławeta, J.
Owsiak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/200662.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alkali-silica reaction
lithium nitrate
ettringite formation
expansion
SEM/EDS
azotan litu
ekspansja
Opis:
Alkali-silica reaction (ASR) is a reaction between amorphous or poorly crystallized siliceous phase, present in aggregates, and sodium and potassium hydroxides in the pore solution of concrete. Chemical admixtures such as lithium compounds are known to have high potential of inhibiting ASR. The aim of this study was to determine the effect of lithium nitrate on ASR in mortars containing high reactive opal aggregate over a long period of time. Mortar bar expansion tests were performed and microstructures of mortar bars were observed by scanning electron microscopy coupled with an energy dispersive X-ray microanalyser. Results from this study showed that effectiveness of lithium nitrate in mitigating ASR was limited over a long period of time. A larger amount of ASR gel which was formed in the presence of lithium nitrate indicated that the deterioration processes intensify within longer periods of time, which so far has not been observed in literature. Microscopic observation confirmed the presence of alkali-silica gel and delayed ettringite in mortars with lithium nitrate.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 6; 773-778
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on Flexural Properties and Construction of Failure Mode Map for Copper Sandwich Panels
Autorzy:
Vino, A,
Kalaichelvan, K.
Sajith, S.
Kumaresan, G.
Powiązania:
https://bibliotekanauki.pl/articles/2174592.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
brazing
forming
honeycomb
strain energy
flexural stiffness
ED wire cutting
Dies
EDS
Opis:
This paper is focused on investigating the mechanisms associated with different failure modes of copper (C101) sandwich panels with honeycomb cores of different heights subjected to flexural loading. Honeycomb core is made up of copper strips which were formed to required shapes using Dies fabricated by Electric Discharge Wire cut machining technique. All the joints in the sandwich panel were established through Brazing technique. Three-point bending test was conducted as per ASTM standard C-393. It was observed that increase in height of the core resulted in panels with higher strength to weight ratio. It also exhibited higher stiffness to weight ratio and very high strain energy absorption ability. An increase in flexural strength was reported with a maximum of 43% improvement for 10.9 mm core compared to 6.9 mm core. Further, 81.75% increase in absorbed strain energy was reported for 10.9 mm thick panel compared to 6.9 mm. The Optical and scanning electron microscope (SEM) analysis confirmed the establishment of good bonding between the filler and the substrate. Energy-dispersive Spectroscopic (EDS) analysis revealed the presence of Cu, Al, Zn, SiO2 and CaCO3 in the substrate. Further it also revealed the presence of Cu, CaCO3 and GaP in the filler material. The failure mode map was constructed which can be used for predicting different types of failures more likely to occur for specific parameters of copper sandwich panel. The dominant failures occurred during testing was in good agreement with the prediction done through failure mode map. The appreciable results in the proposed research may be supportive in construction of cooling system. The structure development and process control are convenient in mass production in automobile industries.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1371--1380
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of Ledeburite in EDS Analyses of Directionally Solidified Eutectic White Cast Iron
Autorzy:
Trepczyńska-Łent, Małgorzata
Seyda, J.
Powiązania:
https://bibliotekanauki.pl/articles/2203938.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microsegregation
SEM-EDS analysis
ledeburite
cementite
white cast iron
mikrosegregacja
analiza SEM-EDS
ledeburyt
cementyt
żeliwo białe
Opis:
The paper addresses the microsegregation of Mn, Mo, Cr, W, V, Si, Al, Cu and P in the white cast iron. Eutectic alloy with the content of 4.25% C was studied. The white cast iron was directionally solidified in the vacuum Bridgman-type furnace at a constant pulling rate v=83 μm/s and v=167 μm/s and at a constant temperature gradient G = 33.5 K/mm. The microstructural research was conducted using light and scanning electron microscopy. The microsegregation of elements in ledeburite was evaluated by EDS measurements. Content of elements in ledeburitic cementite and ledeburitic pearlite was determined. The tendency of elements to microsegregation was found dependent on the solidification rate. Microsegregation of elements between pearlite and cementite structural constituents has been specified. The effect of solidification rate on the type and intensity of microsegregation in directionally solidified eutectic white cast iron was observed. A different type of microsegregation was observed in the components of ledeburite in cementite and pearlite.
Źródło:
Archives of Foundry Engineering; 2022, 22, 4; 65--71
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modern Semi-Majolica and Glazed Ceramics from Rzeszów – Research on the Findings from the Archaeological Sites on 3 Maja Street
Autorzy:
Trąbska, Joanna
Kocańda, Paweł
Trybalska, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/958152.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Rzeszowski. Instytut Archeologii Uniwersytetu Rzeszowskiego. Muzeum Okręgowe w Rzeszowie
Tematy:
Podkarpacki
Rzeszów
semi-maiolica
glazed pottery
SEM/EDS
Opis:
Steadily growing collection of modern ceramics of the present Podkarpackie Voivodeship, has not yet been fully documented. Historical research demonstrates that Rzeszów, located on the communication route with Russia, occupied a very important position in trade relations with the East and West. The archaeometric study was performed on two fragments of semi-majolica plates and six fragments of glazed jugs, pots and tripod vessels. Vessels were made of fine-grained paste of smectite/illite, kaolinite/illite and kaolinite/illite/smectite clay. The richness of colours and shades is surprising. In the case of semi-majolica, the underglaze paintings were made with the use of frit pigments, while the overglaze ornament was made with the use of Pb-P-Ca-Si paste. ‘Slip-painting’ technique was also used. Glazes were coloured with iron, copper and cobalt compounds of various combinations and concentrations which provided different shades. In the case of semi-maiolica quartz-argillaceous primer with a potassium-bearing substance was applied, surfaces under glazes were covered with flux-bearing substances
Źródło:
Analecta Archaeologica Ressoviensia; 2019, 14; 109-136
2084-4409
Pojawia się w:
Analecta Archaeologica Ressoviensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polichromia wybranych rzeźb z projektu „Styl piękny w redakcji czeskiej w Prusach – rzeźba kamienna z lat 1380–1400” w świetle badań instrumentalnych
Polychrome on selected sculptures included in the project: "The Bohemian Beautiful Style in Prussia – stone sculptures from the years 1380–1400" in the light of instrumental research
Autorzy:
Tomkowska, Anna
Kurkowska, Joanna
Jeżewska, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/21151097.pdf
Data publikacji:
2022
Wydawca:
Narodowy Instytut Dziedzictwa
Tematy:
rzeźba kamienna
styl piękny w redakcji czeskiej
badania materiałoznawcze
SEM-EDS
FTIR
GC-MS
stone sculpture
the Bohemian beautiful style
material science research
Opis:
Przedmiotem niniejszego artykułu są wyniki badań polichromii i warstw dekoracyjnych wybranych rzeźb kamiennych w ramach projektu „Styl piękny w redakcji czeskiej w Prusach – rzeźba kamienna z lat 1380–1400”, przeprowadzonych w laboratorium Międzyuczelnianego Instytutu Konserwacji i Restauracji Dzieł Sztuki, Pogotowia Konserwatorskiego. Wśród materiału poddanego analizom znalazły się próbki zawierające pigmenty oraz spoiwa organiczne wchodzące w skład dekoracji barwnych, jak również materiał stanowiący substancję nawarstwień. Do identyfikacji wykorzystano różne techniki instrumentalne, takie jak spektroskopia w podczerwieni z transformacją Fouriera (FTIR), chromatografia gazowa połączona ze spektrometrią mas (GC/MS) oraz skaningowa mikroskopia elektronowa sprzężona ze spektrometrem rentgenowskim (SEM-EDS), a także obrazowanie 3D. Budowę warstwową oraz charakter poszczególnych warstw ustalono na podstawie obserwacji przekrojów poprzecznych próbek w świetle widzialnym (VIS) oraz we fluorescencji wzbudzonej ultrafioletem (UV). Wśród badanych próbek wykryto historycznie stosowane pigmenty w warstwach malarskich, takie jak azuryt, cynober, grynszpan, a także złoto w warstwach pozłoty. Analiza pigmentów, spoiw oraz budowy warstwowej poszczególnych próbek dostarczyła informacji na temat techniki i technologii, rzucając światło na aspekt związany z procesem dekorowania rzeźb kamiennych.
The subject of this article are the results of research on the polychrome and decorative layers of selected stone sculptures as part of the project The Bohemian Beautiful Style in Prussia – stone sculptures from the years 1380–1400 carried out in the laboratory of the InterUniversity Institute of Conservation and Restoration of Works of Art, Emergency Conservation. Among the materials subjected to analysis were samples containing pigments and organic binders included in the colour decorations, as well as the material constituting the substance of the layers. Various instrumental techniques were used for identification, such as Fourier transform infrared spectroscopy (FTIR), gas chromatography – mass spectrometry (GC/ MS) and scanning electron microscopy coupled with Energy-dispersive x-ray spectroscopy (SEM-EDS), as well as 3D imaging. The layered structure and the nature of individual layers were determined based on an observation of cross-sections of the samples in visible light (VIS) and ultraviolet (UV) fluorescence excitation. Historically used pigments in the paint layers, such as azurite, cinnabar, verdigris, as well as gold in gilding layers, were detected among the samples examined. The analysis of the pigments, binders and the structure of the layers of the individual samples provided information on the technique and technology used, thereby shedding light on the aspect related to the process of decorating stone sculptures.
Źródło:
Ochrona Zabytków; 2022, 2; 85-106
0029-8247
2956-6606
Pojawia się w:
Ochrona Zabytków
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of cement bypass dust on the properties of cement curing under normal and autoclave conditions
Wpływ pyłu z instalacji bypassa pieca cementowego na właściwości cementu dojrzewającego w warunkach normalnych i autoklawizacji
Autorzy:
Tkaczewska, Ewelina
Powiązania:
https://bibliotekanauki.pl/articles/402541.pdf
Data publikacji:
2019
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
cement bypass dust
curing condition
standard consistency
initial setting time
soundness
compressive strength
SEM/EDS analysis
pył z instalacji bypassa pieca cementowego
warunki dojrzewania
konsystencja normowa
początek czasu wiązania
stałość objętości
wytrzymałość na ściskanie
analiza SEM-EDS
Opis:
This paper analyses the properties of cement binders composed with cement CEM I 42.5R and cement bypass dust in amount of 0.5, 1.0 and 5.0% by mass of binder, curing under standard and additionally autoclave conditions. The bypass dust increases the water content for standard consistency and delays the initial setting time of binder. The cement paste containing 5% of dust reveals the change in volume by 6 mm according to Le Chatelier test. After 2 days, the compressive strength of cement mortar containing bypass is comparable to that of Portland cement mortar, but at later time the strength development of this cement binder is slower. The addition of cement bypass dust in amount to 1% can obtain the cement of strength class of 42.5R according to standard PN-EN 197-1. The autoclave curing improves the compressive strength of cement mortar. The SEM/EDS observations confirm the presence of low crystalline C-S-H gel and well-formed tobermorite fibres in autoclaved cement mortar containing 5% of cement bypass dust.
W pracy analizowano właściwości spoiw cementowych zawierających w składzie cement portlandzki CEM I 42,5R i pył z instalacji bypassa pieca cementowego w ilości 0,5, 1,0 i 5,0% masy spoiwa, dojrzewających w warunkach normalnych i dodatkowo w autoklawie. Pył z bypassa zwiększa ilość wody niezbędnej do uzyskania konsystencji normowej oraz opóźnia początek czasu wiązania spoiwa. Zaczyn zawierający 5% pyłu wykazuje zmianę objętości o 6 mm według Le Chateliera. Po dwóch dniach wytrzymałość na ściskanie zaprawy ze spoiwa zawierającego pył z bypassa jest porównywalna z wytrzymałością zaprawy z cementu portlandzkiego, ale w miarę upływu czasu przyrost wytrzymałości zaprawy z tego spoiwa jest mniejszy. Dodatek pyłu z bypassa w ilości nieprzekraczającej 1% pozwala otrzymać cement klasy wytrzymałości 42,5R według wymagań normy PN-EN 197-1. Autoklawizacja zwiększa wytrzymałość na ściskanie zaprawy cementowej, a pył z bypassa stanowi jeden z czynników poprawiających właściwości wytrzymałościowe. Obserwacje SEM/EDS potwierdzają obecność słabo wykrystalizowanego żelu C-S-H i dobrze wykształconych włókien tobermorytu w próbce zaprawy zawierającej 5% pył z bypassa dojrzewającej w warunkach autoklawu.
Źródło:
Structure and Environment; 2019, 11, 1; 5-22
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal variation in elemental composition of certain seaweeds from Mandapam and Kilakarai coast, Gulf of Mannar biosphere reserve
Autorzy:
Thillaivasan, Muthukumarasamy
Kumar, Kaliyamoorthy
Silvakumar, Kathiresan
Powiązania:
https://bibliotekanauki.pl/articles/1075507.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Gracilaria corticata
Gracilaria verrucosa
Grateloupia filicinia
Gulf of Mannar
Post monsoon
Pre-monsoon
SEM-EDS
Sargassum wightii
Seaweeds
Stoechospermum marginatum
Summer
monsoon
Opis:
Vegetative plants of certain seaweeds were collected from the natural habitat of Kilakarai and Mandapam coast were subjected to SEM-energy dispersive spectroscopic analysis and quantified the following minerals viz., Na, Mg, Si, S, Cl, K, Ca, Mn, P, Fe, Zn and Cr during summer, pre-monsoon, monsoon and post-monsoon seasons in 2007-2008. The order of preferential accumulation of elemental composition during summer 2007 in Sargassum wightii: Ca > Mg > Na > S > Fe > Si > Cl > K > Mn; Stoechospermum marginatum: Ca > Si > S > Mg > Mn > P > Na; Gracilaria corticata: Ca > Mg > Na > Si > Cl > S > Mn > K > Fe > P; Gracilaria verrucosa: Ca > Cl > Si > Mg > Na > P > S > Mn > Fe > K and Grateloupia filicinia: Ca > Cl > P > Si > Na > Cr > K. Seasonal distribution of elemental composition in the seaweeds showed that most of the minerals were high during the summer followed post-monsoon and monsoon seasons. This could perhaps be due to an ambient concentration of these minerals was high during these seasons thereby facilitating their uptake by seaweeds.
Źródło:
World Scientific News; 2019, 129; 147-160
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the TOF-SIMS and SEM-EDS methods to assess the influence of dusting from a phosphate waste deposal place based on hair analysis
Autorzy:
Szynkowska, M.I.
Leśniewska, E.
Pawlaczyk, A.
Rogowski, J.
Paryjczak, T.
Powiązania:
https://bibliotekanauki.pl/articles/778695.pdf
Data publikacji:
2007
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
fosfogips
analiza powierzchni
włos
SEM-EDS
ToF-SIMS
phosphogypsum
surface analysis
hair
TOF-SIMS
Opis:
In this work, scanning electron microscopy with energy dispersive X-ray spectrometry (SEM-EDS) and the time-of-flight secondary ion mass spectrometry (TOF-SIMS) were used to study the particles present on the hair surface of the inhabitants of Wislinka (people environmentally exposed due to the closeness of a dump) in order to obtain the information about the possible influence of dusting from a phosphate waste deposal place. Additionally, the morphology and the composition of fresh phosphogypsum were analyzed. Waste phosphogypsum is formed in the process of a wet phosphoric acid production and there is still a problem with its storage. A thorough understanding of the composition and chemistry of phosphogypsum seems to be necessary to evaluate its environmental impact comprehensively. The results obtained from these two techniques turned out to be complementary and revealed the information expected.
Źródło:
Polish Journal of Chemical Technology; 2007, 9, 4; 85-90
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagenetic signals from ancient human remains - bioarchaeological applications
Autorzy:
Szostek, Krzysztof
Stepańczak, Beata
Szczepanek, Anita
Kępa, Malgorzata
Głąb, Henryk
Jarosz, Paweł
Włodarczak, Piotr
Tunia, Krzysztof
Pawlyta, Jacek
Paluszkiewicz, Czesława
Tylko, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2086507.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
diagenesis
Neolithic
oxygen isotopes
FTIR
EDS
bioarchaeology
Opis:
This preliminary study examines the potential effects of diagenetic processes on the oxygen-isotope ratios of bone and tooth phosphate (δ18O) from skeletal material of individuals representing the Corded Ware Culture (2500–2400 BC) discovered in Malżyce (Southern Poland). Intra-individual variability of Ca/P, CI, C/P, collagen content (%) and oxygen isotopes was observed through analysis of enamel, dentin and postcranial bones. Using a variety of analytical techniques, it was found that, despite the lack of differences in soil acidity, not all the parts of a skeleton on a given site had been equally exposed to diagenetic post mortem changes. In a few cases, qualitative changes in the FTIR spectrum of analysed bones were observed. The data suggest that apart from quantitative analyses, i.e., the calculation of Ca/P, CI, C/P and collagen content, qualitative analyses such as examination of the absorbance line are recommended. The degree to which a sample is, contaminated on the basis of any additional, non-biogenic peaks, deemed to be contaminated should also be specified.
Źródło:
Mineralogia; 2011, 42, 2/3; 93--112
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagenetic signals from ancient human remains - bioarchaeological applications
Autorzy:
Szostek, K.
Stepańczak, B.
Szczepanek, A.
Kępa, M.
Głąb, H.
Jarosz, P.
Włodarczak, P.
Tunia, K.
Pawlyta, J.
Paluszkiewicz, C.
Tylko, G.
Powiązania:
https://bibliotekanauki.pl/articles/2086542.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
diagenesis
Neolithic
oxygen isotopes
FTIR
EDS
bioarchaeology
Opis:
This preliminary study examines the potential effects of diagenetic processes on the oxygen-isotope ratios of bone and tooth phosphate (δ18O) from skeletal material of individuals representing the Corded Ware Culture (2500–2400 BC) discovered in Malżyce (Southern Poland). Intra-individual variability of Ca/P, CI, C/P, collagen content (%) and oxygen isotopes was observed through analysis of enamel, dentin and postcranial bones. Using a variety of analytical techniques, it was found that, despite the lack of differences in soil acidity, not all the parts of a skeleton on a given site had been equally exposed to diagenetic post mortem changes. In a few cases, qualitative changes in the FTIR spectrum of analysed bones were observed. The data suggest that apart from quantitative analyses, i.e., the calculation of Ca/P, CI, C/P and collagen content, qualitative analyses such as examination of the absorbance line are recommended. The degree to which a sample is, contaminated on the basis of any additional, non-biogenic peaks, deemed to be contaminated should also be specified.
Źródło:
Mineralogia; 2011, 42, 2/3; 93--112
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Niszczenie okładziny piaskowcowej w zabytkowym budynku Traktu Królewsko-Cesarskiego w Poznaniu
Deterioration process of sandstone panels in a historic building of the Royal-Imperial Route in Poznań, Poland – a case study
Autorzy:
Szczepaniak, Małgorzata
Rój, Paulina
Powiązania:
https://bibliotekanauki.pl/articles/2075927.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
okładzina piaskowcowa
dziedzictwo kulturowe
niszczenie
SEM-EDS
Poznań
sandstone panels
cultural heritage
deterioration
Opis:
Sandstones are a commonly used stone in the architecture of Poznań. They are constantly affected by deterioration processes. This is mainly linked to pollution, which is a consequence of the city development. This is manifested, among others, by the emission of harmful substances from traffic routes, as well as the combustion of solid fuels in the city centre. The research is focused on the sandstone elevation of one of the monuments of the Royal-Imperial Route in Poznań - the current building of the University of Economics and Business in Poznań dated to the beginning of the 20th century. The research was carried out both -on a macro- and microscale. Taking into account the ICOMOS glossary (International Council on Monuments and Sites), the types of damage on the façade on a macroscale were classified. The most common problem was the black crust on the surface of stone panels. Thanks to the use of optical, scanning and cathodoluminescence microscopy, it was also possible to analyse various types of contaminants on a microscale that appear in the building elevation. As a result of the research, dust particles, metals such as lead, tin, zinc, iron, and sulphur and nitrogen compounds that were part of dust particles were found. Deterioration of the façade caused by soiling derived from traffic-related particulate matter, deposition of nitrates from exhaust and other emission sources may seriously impact natural building stones.
Źródło:
Przegląd Geologiczny; 2019, 67, 9; 717--727
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zróżnicowanie procesów deterioracji elewacji piaskowcowej XIX-wiecznego budynku Archiwum Państwowego w Poznaniu
Diversity of the deterioration processes of the 19th century sandstone facade of the National Archive in Poznań
Autorzy:
Szczepaniak, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/2076215.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
okładzina piaskowcowa
dziedzictwo kulturowe
deterioracja
XRD
SEM-EDS
Poznań
sandstone panels
cultural heritage
deterioration
Opis:
Stone has been used in architecture since Antiquity. The processes of its deterioration in different buildings have always been associated with natural processes of its weathering (physical, chemical, biological). However, this situation has changed over centuries. Currently, air pollution (mainly in urbanised areas) has a significant impact on the accelerated weathering of stone monuments. The research presented in this paper concerns the deterioration of stone facade of the 19th century building of the National Archive in Poznań, where the latest factor (contemporary air pollution) plays the greatest role. Based on the ICOMOS glossary, selected forms of deterioration were described and classified in macro and micro scales. For this purpose, optical and scanning microscopy and X-ray diffraction were used. As a result of the research, lichen species composition and secondary mineralisation in the black crust were identified. Elements, such as: barium, zinc, lead, and iron, which were detected on the black crust, were directly related to anthropogenic pollution caused mainly by combustion and low emissions.
Źródło:
Przegląd Geologiczny; 2021, 69, 2; 127--134
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural and Equilibrium Adsorption Study of the System of Waste Foundry Molding Sand/Cu (II) Ions
Autorzy:
Strkalj, A.
Glavas, Z.
Slokar, L.
Powiązania:
https://bibliotekanauki.pl/articles/354568.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
waste foundry molding sand
Cu (II) ions
adsorption
SEM/EDS analysis
Opis:
This paper deals with the waste foundry molding sand which originally comes from the casting production. Adsorption of Cu (II) ions on the waste foundry molding sand was studied. Experimental data were processed using adsorption isotherms. Obtained results show that the experimental data are best described by the Langmuir isotherm. The following adsorption capacities are obtained: 7.153 mg/g to 293 K, 8.403 mg/g at 333 K and 9.208 mg/g at 343 K. The kinetics and thermodynamics of the process were analysed. The obtained results indicate that the adsorption process takes place according to the pseudo second order kinetic model with the following constants: 0.438 g/mg min at 293 K, 0.550 g/mg min at 333 K and 1.872 g/mg min at 343 K. The following values of ΔG° were obtained: − 95.49 J/mol at 293 K, − 736.99 J/mol at 333 K and − 1183.46 J/mol at 343 K. The value of ΔH° is − 4.16 kJ/mol and the value of ΔS° is 15.17 J/molK. These results were confirmed by microscopic examinations. The results indicate that the adsorption process of Cu (II) ions on waste foundry molding sand is possible. Results of microscopic examinations show the homogeneity of the surface, which is proof of the chemisorption. Cu (II) ions on the surface of the waste foundry molding sand were detected after adsorption by EDS analysis, which proves the existence of the adsorption process.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1805-1812
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 89

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