We report theoretical calculations of the thermal conductivity of superfluid He impregnated into high-porosity aerogel and compare these results with available experimental data.

Polycrystalline Platinum Nanofilms Q. G. ZHANG, B. Y. CAO, X. ZHANG, M. FUJII and K. TAKAHASHI, J. Phys.: Condens. Matter, 2006, 18, (34), 7937–7950 The thicknesses of the studied polycrystalline Pt nanofilms (1) ranged from 15.0–63.0 nm and the mean grain sizes varied from 9.5–26.4 nm. The thermal conductivities of (1) measured by a direct electrical heating method are greatly reduced from the...

this paper presents the thermal vibration analysis of double-layer graphene sheet embedded in polymer elastic medium, using the plate theory and nonlocal continuum mechanics for small scale effects. the graphene is modeled based on continuum plate theory and the axial stress caused by the thermal effects is also considered. nonlocal governing equations of motion for this double-layer graphene s...

in this paper, wavelet collocation method has been used to solve nonlinear fin problem with temperature dependent thermal conductivity and heat transfer coefficient. thermal conductivity of fin materials varies any type so that we consider thermal conductivity as the general function of temperature.  here we consider three particular cases, where we assume that thermal conductivity is constant,...

in this work, the strontium-doped lanthanum manganite- a ceramic material- used as cathode in solid oxide fuel cells. an impression of grinding time on the structural and thermal properties of sr-doped lamno3 system with la1-xsrxmno3 (x=0.2) stoichiometric ratio was investigated. the nano crystallite lsm powder with cubic structure was prepared by varying the milling time of planetary monomill ...

In current study, the synthesis and characterization of novel thermally stable polyimides (PIs) containing an 1,3,4-oxadiazole moiety based on a diamine, i.e. 2,5-bis(3-amino-4-methyl benzene)-1,3,4-oxadiazole (BAMO), have been reported. The polymers were characterized using FT-IR and elemental analysis (CHN). Thermal and mechanical behaviours of the prepared PIs were studied by thermo-gravimet...

b1-xlaxfeo3 (x = 0.0, 0.025) crystallites were prepared by chemical solution route. xrd analysis confirmed the phase formation of the materials. thermal characterization was done by dsc-tga to confirm crystallization and thermal behavior for phase development. morphological studies by fesem showed the agglomerated nature of the ferrite and edx analysis confirmed the degree of doping. ftir studi...

composite solid propellants were prepared with and without nano-alloys (ti-co, ti-ni, ti-zn), where nano-alloys used as catalyst. these nano-alloys are prepared by hydrazine reduction method. catalytic properties of these nanomaterials were measured on ammonium perchorate/hydroxyterminatedpolybutadiene propellant by thermogravimetery analysis and differential thermal analysis. both experimental...

acanthophyllum laxiusculum is one of the most widely distributed species of the genus in iran that flourishes in steppe and mountainous regions of the country. in the present study, water-soluble content of a. laxiusculum roots was extracted by boiling water and further successively purified partially by a defined solvent system. surface tension measurements revealed the ability of plant extrac...