Güncel Gönderiler: Mühendislik Fakültesi
Toplam kayıt 2037, listelenen: 81-100
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Effect of different nucleation temperatures on the microstructural development of ?-SiAlON ceramics
(2004)?-SiAlON ceramics with elongated grains were previously observed in different studies. Sintering conditions are known to have a significant role on the microstructural development. By the nucleation treatment application ... -
Microstructural evolution R-?-SiAlON ceramics (R=Y, Y+Sm and Sm)
(2004)Yttrium or samarium doped ?-SiAlON composition was sintered using gas pressure sintering through two different sintering procedures. One group of samples was heated up to 1800°C and then held for 1h while another group of ... -
Formation of ?-SiAlON ceramics containing scandium
(2004)?-SiAlON is able to accommodate cations into its crystal structure if the cations are sufficiently small in size, thus helping to reduce the volume of the remnant grain boundary phase after processing. Lutetium with an ... -
Composite transducer arrays for the treatment of diabetes
(Wiley, 2005)A portable transdermal drug delivery system using a composite transducer array has been designed to promote insulin transmission through the skin using ultrasound. Previous investigators used large, heavy sonicators in ... -
Structural characterisation of Er-Si-Al-O-N glasses by Raman spectroscopy
(Elsevier Sci LTD, 2007)Er-Si-Al-O-N glasses have been prepared with cation ratio Er:Si:AI=3.45:3:2 containing various amounts of nitrogen (N=O, 5, 8, 15 and 22equiv.%). Glass properties such as microhardness, glass transition temperature and ... -
Effects of red mud based pigments on wall and floor tile glazes
(2005)In the present study, high iron oxide containing red mud appeared and disposed during the metallic aluminium production of Seydisehir aluminium factory of Turkey was combined with several colouring oxides for the purpose ... -
Deaging of heat-treated iron-doped lead zirconate titanate ceramics
(Amer Inst Physics, 2006)Doping strongly influences the properties of ferroelectric perovskite materials. One striking difference between donor- and acceptor-doped materials is the transition from "soft" to "hard" ferroelectric behavior. The ... -
Chemical durability behaviour of bulk glasses in the Er-SiAlON system: Surface characterisation by SEM
(Trans Tech Publications LTD, 2004)Er-SiAlON glasses were produced by melting appropriate powder mixtures under nitrogen at 1715 degreesC using a cation ratio composition of Er:Si:Al = 3.45:3:2 and with varying nitrogen contents (N= 5 to 22 equivalent %). ... -
Pressure limitations of miniature hollow sphere hydrophones
(Taylor & Francis LTD, 2005)Ultrasonic probes that can withstand high pressures and temperatures are needed for deep oil wells, underwater sonar systems, the processing of chemicals, and as automotive actuators. Pressure limits of hollow spherical ... -
Pressure dependence of cymbal transducers
(IEEE-Inst Electrical Electronics Engineers Inc, 2007)The hydrostatic pressure limit that a receiver can withstand without failure is of major importance in underwater sonar systems. In this paper, the hydrostatic pressure tolerance and sensitivity of cymbal receivers were ... -
Possible use of trachyte as a flux in floor tile production
(Techna Srl, 2006)The possible use of trachyte as an alternative fluxing agent in a commercial floor tile body was investigated. The experiments were carried out two parts: In the first part, standard tests were applied to the products ... -
Image analysis of sulfate attack on hardened cement paste
(Elsevier Sci LTD, 2008)This paper presents an investigation conducted on the sodium sulfate resistance of Portland cements with various C(3)A contents, and on two blended cements produced by replacing 40% Of low C3A cement with fly ashes having ... -
The characterization and the utilization of the waste clays from Gumuskoy silver mine in brick industry
(Trans Tech Publications LTD, 2004)In this study, the main characteristics and technological properties of the waste clays from silver deposit located in the northern part of Kutahya (mid-south of Turkey) are presented. The clays were characterized by X-ray ... -
The utilization of waste clay from coal basin in the wall tile body formulation
(Trans Tech Publications LTD, 2004)In this study, the waste clays extracted from coal basin were used as a wall tile ingredient instead of the clay materials of the standardized biscuit formulation of the wall tile. XRD data show that waste clay contains ... -
Fixed-bed catalytic pyrolysis of cotton-seed cake: Effects of pyrolysis temperature, natural zeolite content and sweeping gas flow rate
(Elsevier Sci LTD, 2006)Catalyzed pyrolysis of cotton-seed cake was studied under different experimental conditions. Variables investigated were pyrolysis temperature, zeolite content and sweeping gas flow rate. Experiments were carried out ... -
Evaluation of a natural stone with fluxing capability in stoneware glazes
(Trans Tech Publications LTD, 2004)New glaze systems have been continuously developed in order to supply certain advantages to ceramic bodies such as resistance against external thermal and mechanical forces and an aesthetic appearance as well as hygiene. ... -
Utilisation of a natural stone with fluxing ability in floor tile body as a Na-feldspar replacement
(Trans Tech Publications LTD, 2004)In 1960's the floor tile production of Turkey was started with a large use of K-feldspar as a fluxing agent. However, due to its limited deposits companies begun to employ Na-feldspar instead. At present, considerable level ... -
Effects of the red mud based pigment addition on the physical and micro-structural properties of porcelain tiles
(Trans Tech Publications LTD, 2004)In the production of conventional porcelain tiles colouring agents, being either in the form of pure oxides or pigments, are commonly and widely used at considerably high amounts to increase the attraction impact of final ... -
Producing cordierite from local magnesium sources
(Trans Tech Publications LTD, 2004)Cordierite ceramics were produced by using local magnesium sources. Mixtures were sintered at different temperatures to examine formation of cordierite. a-cordierite was formed as a major phase over 1150degreesC. High bulk ... -
Catalytic pyrolysis of biomass: Effects of pyrolysis temperature, sweeping gas flow rate and MgO catalyst
(Pergamon-Elsevier Science LTD, 2010)Cotton seed, as a biomass source, is pyrolysed in a tubular fixed-bed reactor under various sweeping gas (N(2)) flow rates at different pyrolysis temperatures. In the non-catalytic work, the maximum bio-oil yield was ...
