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1.
The polycrystalline samples of Dy
x
Bi1−x
FeO3 (x = 1, 0.8, 0.6, 0.4 and 0.2) were synthesized by standard solid state reaction technique. The samples synthesized were characterized
by X-ray diffraction (XRD) technique. Further the samples were characterized by infrared (IR) spectroscopic technique. The
dielectric measurements were carried out as a function of frequency in the range 100 Hz to 1 MHz at room temperature. Also
the dielectric measurements were carried out as a function of temperature at certain fixed frequencies. The ac and dc resistivity
measurements were carried out using two probe method. Also temperature dependence of ac and dc resistivity was noted. These
measurements suggest polaron conduction in the samples. Finally, the data from XRD, IR, dielectric measurements were correlated. 相似文献
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4.
M.?D.?S.?Pirzada F.?H.? Froes S.?N.?Patankar 《Metallurgical and Materials Transactions A》2004,35(6):1899-1903
Synthesis of nanocrystalline Ti-6Al-4V was explored using mechanochemical processing. The reaction mixture was comprised of
CaH2, Mg powder, anhydrous AlCl3, anhydrous VCl3, and TiCl4. The milled powder (reaction product) primarily consisted of nanocrystalline alloy hydride having a composition (Ti-6Al-4V)H1.942, along with MgCl2 and CaCl2 as by-products. Aqueous solutions of nitric acid, sulfuric acid, and 1 pct sodium sulfite were found to be very effective
in leaching of the chlorides from the milled powder. The (Ti-6Al-4V)H1.942 on dehydrogenation at 375°C resulted in nanocrystalline Ti-6Al-4V alloy powder. 相似文献
5.
6.
Carbon fibre reinforced Al-12% Si alloy composite has been fabricated by pre-treating the fibres with K2ZrF6 followed by molten alloy infiltration and subsequent hot pressing of the preforms. The infiltration conditions were arrived
at based on the measurement of tensile strength of the fibres extracted from the preforms. The fibre volume per cent of 20
was found to result in composite tensile strength of about 240 MPa as compared to tensile strength of 100 MPa for the unreinforced
matrix. Characterization of the interface revealed the formation of ZrSi2 and diffusion of potassium and aluminium into the fibre. The interfacial bonding was strong as is evinced by the absence
of fibre pull-out on to the fracture surface. 相似文献
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M.K. Choudhary K.C. Karki S.V. Patankar 《International Journal of Heat and Mass Transfer》2004,47(26):5629-5638
Porous insulation used on pipes carrying cold fluids suffers thermal degradation due to condensation of water vapor and the build up of water in the insulation. Recently, it has been suggested that the thermal degradation can be significantly reduced by wrapping a hydrophilic wick fabric on the cold pipe. The capillary action of the fabric, aided by gravity, allows the condensed moisture to move to the outer surface of the insulation, from where, if ambient conditions are right, it evaporates. This paper presents the details of a mathematical model for condensation in the insulation in the presence of the wick fabric. The model is based on the volume-averaged equations for unsteady transport of heat, water vapor, and liquid water in a porous medium. The wick is modeled as an anisotropic porous medium. The model also allows for the presence of a vapor retarder jacket that is used to reduce the ingress of water vapor into the insulation. The model has been applied to an insulation layer around a horizontal pipe. The presence of the wick is shown to significantly reduce the amount of liquid water in the insulation. The results of the model have been verified using laboratory experiments and field tests. 相似文献
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