نتایج جستجو برای: thermal conductivity coefficient

تعداد نتایج: 412572  

2017
Mi-Kyung Han Yingshi Jin Da-Hee Lee Sung-Jin Kim

In order to understand the effect of Pb-CuI co-doping on the thermoelectric performance of Bi₂Te₃, n-type Bi₂Te₃ co-doped with x at % CuI and 1/2x at % Pb (x = 0, 0.01, 0.03, 0.05, 0.07, and 0.10) were prepared via high temperature solid state reaction and consolidated using spark plasma sintering. Electron and thermal transport properties, i.e., electrical conductivity, carrier concentration, ...

2011
Shi-Qiang Chen Hai-Xing Wang E. Y. Choueiri

The knowledge of two-temperature transport coefficients is of interest in the modelling of fluid flow and heat transfer processes in electric propulsion devices. Variations of species mole fraction, number density, specific enthalpy, specific heat at constant pressure, viscosity, electrical conductivity and thermal conductivity as a function of pressure, electron temperature and different degre...

2017
Georgios Menikou Christakis Damianou

BACKGROUND This study describes a series of experimental work completed towards characterizing candidate materials for fabricating brain and muscle tissue mimicking phantoms. METHODS The acoustic speed, attenuation, impedance, thermal diffusivity, specific heat and thermal conductivity were measured. RESULTS The resulting brain (2% w/v agar-1.2% w/v Silica Dioxide-25%v/v evaporated milk) an...

2005
Masayuki Nakata Katsuaki Suganuma

The purpose of the present work was to clarify the effects of parameters of porous ceramics on the characteristics of composites fabricated by high-pressure infiltration. Alumina with different porosity (15–70 vol%) and pore morphology was successfully fabricated by gelate-freezing and the partial-sintering, respectively. Alumina/aluminum composites were made by squeeze casting, the aluminum in...

Journal: :The Review of scientific instruments 2013
R L Kallaher C A Latham F Sharifi

We describe an apparatus which concurrently and independently measures the parameters determining thermoelectric material conversion efficiency: the Seebeck coefficient, thermal conductivity, and electrical resistivity. The apparatus is designed to characterize thermoelectric materials which are technologically relevant for waste heat energy conversion, and may operate from room temperature to ...

Journal: :Small 2016
Wenbin Zhou Qingxia Fan Qiang Zhang Kewei Li Le Cai Xiaogang Gu Feng Yang Nan Zhang Zhuojian Xiao Huiliang Chen Shiqi Xiao Yanchun Wang Huaping Liu Weiya Zhou Sishen Xie

An ingenious strategy is put forward to evaluate accurately the thermoelectric performance of carbon nanotube (CNT) thin films, including thermal conductivity, electrical conductivity, and Seebeck coefficient in the same direction. The results reveal that the as-prepared CNT interconnected films and CNT fibers possess enormous potential of thermoelectric applications because of their ultrahigh ...

2005
Y. K. Kuo K. M. Sivakumar S. J. Huang C. S. Lue

The effects of Ge partial substitution for Si on the thermoelectric properties of CoSi1−xGex alloys were investigated by means of thermal and electrical transport measurements. Electrical resistivity , Seebeck coefficient S , and thermal conductivity measurements were performed on a series of CoSi1−xGex alloys with x varying from 0 to 0.15. A substantial decrease in electrical resistivity and l...

1998
Ju Li Lisa Porter Sidney Yip

In this, the second part of a theoretical study of the thermal properties of crystalline b-SiC, the thermal conductivity is calculated by using molecular dynamics simulation to evaluate directly the heat current correlation function and thus, obtain the conductivity through the Green–Kubo expression in linear response theory. Adopting the same empirical potential model and the temperature scali...

2014
Cinzia Buratti Elisa Moretti Elisa Belloni Fabrizio Agosti

The thermal and acoustic properties of innovative insulating systems used as building coatings were investigated: Granular silica aerogel was mixed with natural plaster in different percentages. This coating solution is transpiring and insulating, thanks to the use of a natural lime coat and aerogel, a highly porous light material with very low thermal conductivity. The thermal conductivity of ...

2008
S. Majumdar

The thermal conductivity of superconducting MgB 2 was studied in both the superconducting and normal state region. The latter is almost equally determined by the electronic-and the lattice thermal conductivity. In the superconducting state, however, the lattice thermal conductivity is larger. The electronic thermal conductivity below T c was derived from the experimental data considering the Ba...

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