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    Wyświetlanie 1-5 z 5
    Tytuł:
    Microstructural characterisation of Co-Cr-Mo casting dental alloys
    Autorzy:
    Szala, M.
    Beer-Lech, K.
    Gancarczyk, K.
    Kilic, O.
    Pędrak, P.
    Özer, A.
    Skic, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/103216.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    casting
    microstructure
    Co-Cr-Mo
    biomaterials
    dendritic structure
    phase composition
    chemical composition
    dental cobalt alloy
    Opis:
    The study compares the microstructure of three commercial dental cobalt matrix alloys with related chemical composition declared by the manufacturer. Casts were produced with lost wax method, then melted and casted with centrifugal induction casting machine. The Co-Cr-Mo alloys were casted according to the manufacturers procedure. The samples’ chemical composition and phase composition, respectively, using WDXRF (Wavelength Dispersive X-Ray Fluorescence) and XRD (X-ray Diffarction) methods were analysed. Casts microstructure by mean of LOM (Light Optical Microscopy), SEM (Scanning Electron Microscopy) and EDS (Energy Dispersive X-ray Spectroscopy) were investigated. Vickers hardness HV10 was measured. Quantitative microstructure evaluation was performed by means of computer image processing. The results of the chemical composition indicate the high stability of the chemical composition for alloy A. In case of alloys B and C, there was a significant difference in carbon content. Quantitative differences in image of microstructure between of castings A and B, C were noticed. The greater amount of precipitates was recorded for castings with higher carbon content. In all investigated castings, the presence of β matrix solution and M23C6 carbide precipitations was found.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 4; 76-82
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deteriorations of pulmonary function, elevated carbon monoxide levels and increased oxidative stress amongst water-pipe smokers
    Autorzy:
    Yalcin, Funda K.
    Er, Mukremin
    Hasanoglu, H. Canan
    Kilic, Hatice
    Senturk, Aysegul
    Karalezli, Aysegul
    Ergin, Merve
    Erel, Ozcan
    Powiązania:
    https://bibliotekanauki.pl/articles/2161884.pdf
    Data publikacji:
    2017-07-14
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    Oxidative stress
    carbon monoxide
    cigarette smoking
    pulmonary function tests
    antioxidant status
    water-pipe smoking
    Opis:
    Objectives A water pipe (hookah) is a tobacco smoking tool which is thought to be more harmless than a cigarette, and there are no adequate studies about its hazards to health. Water-pipe smoking is threatening health of the youth in the world today. The objective of this study has been to investigate the carbon monoxide (CO) levels in breath, examine the changes in pulmonary function tests (PFT) and to assess the change of the oxidative stress parameters in blood after smoking a water pipe. Material and Methods This study is a cross-sectional analytical study that has included 50 volunteers who smoke a water pipe and the control group of 50 volunteers who smoke neither a cigarette nor a water pipe. Carbon monoxide levels were measured in the breath and pulmonary function tests (PFTs) were performed before and after smoking a water pipe. Blood samples were taken from either the volunteer control group or water-pipe smokers group after smoking a water pipe for the purpose of evaluation of the parameters of oxidative stress. Results Carbon monoxide values were measured to be 8.08±7.4 ppm and 28.08±16.5 ppm before and after smoking a water pipe, respectively. This increment was found statistically significant. There were also significant reductions in PFTs after smoking a water pipe. Total oxidative status (TOS), total antioxidant status (TAS) and oxidative stress index (OSI) were found prominently higher after smoking a water pipe for the group of water-pipe smokers than for the control group. Conclusions This study has shown that water-pipe smoking leads to deterioration in pulmonary function and increases oxidative stress. To the best of our knowledge this study is the only one that has shown the effect of water-pipe smoking on oxidative stress. More studies must be planned to show the side effects of water-pipe habit and protective policies should be planned especially for young people in Europe. Int J Occup Med Environ Health 2017;30(5):731–742
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2017, 30, 5; 731-742
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Selected Properties of Eco-Friendly Soybean and Other Fibres
    Porównanie wybranych właściwości ekologicznych włókien sojowych
    Autorzy:
    Yilmaz, D
    Karaboyaci, M
    Kiliç, H
    Kitapçi, K
    Yelkovan, S
    Powiązania:
    https://bibliotekanauki.pl/articles/232900.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    soybean fibre
    regenerated fibre
    dyeing properties
    biodegradable fibre
    sustainable products
    functional properties
    flame resistance
    błonnik sojowy
    regenerowane włókno
    właściwości barwienia
    biodegradowalne włókna
    zrównoważone produkty
    właściwości funkcjonalne
    ognioodporność
    Opis:
    Biodegradable and sustainable products are being employed to make contributions to efforts concerning environmental protection and the reduction of oil consumption. Biodegradable fibres present a simple and notable opportunity for providing sustainable textiles. Soybean fibre is a kind of regenerated and new-generation protein plant fibre. The present work aimed to analyse the many different properties of soybean fibres. Particularly it was focused on their performance, functional, comfort and dyeing properties. In literature, there are studies regarding soybean fibres but topics mostly involved the analysis of comfort properties of the fibre. In this study, fibre structure and composition, flame and UV resistance, strength, pilling behaviour, air and water vapour permeability, water absorption, drape and dyeing properties were studied. It was indicated that soybean fibre is capable of meeting the performance, comfort and functional requirements of classical and technical textile products. The fibre has many of the good qualities of natural fibres such as tenacity, moisture regain, soft-lustrous handle, dyeability and colour fastness properties, and also has some of the functional properties of synthetic fibres such as being flame retardant and anti-ultraviolet.
    Produkty biodegradowalne i odnawialne są coraz powszechniej stosowane dla ochrony środowiska naturalnego i redukcji zużycia paliw. Takim problemem są włókna naturalne w tym sojowe, będące przykładem nowej generacji włókien proteinowych. W pracy przedstawiono analizę rożnych właściwości, w szczególności ich zastosowania, funkcjonalności komfortu użytkowania i wybarwialności. W literaturze znajduje się wiele publikacji związanych z komfortem produktów z włókien sojowych, natomiast w przedstawionych badaniach zwrócono uwagę na ich strukturę i skład a, także ich palność, odporność na promieniowanie UV, wytrzymałość, piling, przepuszczalność powietrza i pary wodnej, absorpcje wody, układalność i wybarwialność. Stwierdzono, że włókna sojowe mają wiele ważnych pozytywnych właściwości charakterystycznych dla innych włókien naturalnych.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2015, 3 (111); 14-24
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of observed voltage oscillations in silver doped high temperature superconductor YBCO
    Autorzy:
    Altinkok, A.
    Olutas, M.
    Yetis, H.
    Kiliç, A.
    Kiliç, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1052665.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.F-
    74.72.-h
    Opis:
    The effect of square wave current was investigated by the voltage-time (V-t curves) measurements at various external magnetic fields and periods (P) in silver doped YBCO. The general sinusoidal behavior of V-t curves was mainly interpreted as a dynamic competition between driving and pinning forces. It is observed that as the period of square wave current is increased, the amplitude of oscillation is also increased. The observed oscillations in the voltage was fitted by an common sinusoidal equation V(t)ımın(ω t+φ). It is also found that there is different phase angle φ values for each cycle. Fast Fourier transform measurements is applied to oscillation period (P_{I}) of the square wave current. The results give us that a physical mechanism is related with charge density waves. Intrinsically, in Ag doped YBCO, the pinned flux line system evokes the general behavior of charge density waves. Due to properties of the converting the square wave current to sinusoidal voltage oscillations, Ag doped YBCO sample can behave as double-integrator for the defined period, amplitude of square wave current and magnetic field values in time.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 1030-1034
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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