نتایج جستجو برای: thermal conductivity coefficient

تعداد نتایج: 412572  

2017
Degang Zhao Lin Bo

In this study, the p-type Ga-doped Cu3Sb1−xGaxSe4 compounds were fabricated by melting, annealing, grinding, and spark plasma sintering (SPS). The transport properties of Ga-doped Cu3Sb1−xGaxSe4 compounds were investigated. As Ga content increased, the hole concentration of Cu3Sb1−xGaxSe4 compounds increased, which led to an increase in electrical conductivity. Meanwhile, the Seebeck coefficien...

Journal: :journal of heat and mass transfer research 0
reza keimanesh m.sc. of mechanical engineering, k. n. toosi university of technology,tehran, iran cyrus aghanajafi faculty of mechanical engineering, k. n. toosi university of technology,tehran, iran

the present study deals with the analysis of the effects of radiative heat transfer of micropolar fluid flow over a porous and stretching sheet in the presence of magnetic field. the dynamic viscosity and thermal conductivity coefficient have formulated by temperature-dependent relations to obtain more exact results. the flow is supposed two-dimensional, incompressible, steady and laminar and t...

2008
Athena S. Sefat Michael A. McGuire Brian C. Sales Rongying Jin Jane Y. Howe David Mandrus

The crystal structure and numerous normal and superconducting state properties of layered tetragonal (P4/nmm) LaFeAsO, with F-doping of  11 %, are reported. Resistivity measurements give an onset transition temperature Tc = 28.2 K, and low field magnetic susceptibility data indicate bulk superconductivity. In applied magnetic field, analysis of the resistive transition results in a critical fi...

2008
Athena S. Sefat Michael A. McGuire Brian C. Sales Rongying Jin Jane Y. Howe David Mandrus

The crystal structure and numerous normal and superconducting state properties of layered tetragonal P4 /nmm LaFeAsO, with F doping of 11%, are reported. Resistivity measurements give an onset transition temperature Tc=28.2 K, and low field magnetic susceptibility data indicate bulk superconductivity. In applied magnetic field, analysis of the resistive transition results in a critical field Hc...

2017
Xin Chen

Thermoelectrics (TE) is a green renewable energy technology which plays an import role in power generation due to its potential in generating electricity out of waste heat. The challenge for the development of thermoelectric is its low conversion efficiency. The efficiency of thermoelectric materials is related to the figure of merit, which is expressed as ZT = S2σT/, where S is the Seebeck coe...

2009
G. A. Fernández J. Vrabec

Equilibrium molecular dynamics simulation and the Green-Kubo formalismwere used to calculate self-diffusion coefficient, shear viscosity, and thermalconductivity for 30 different quadrupolar two-center Lennard-Jones fluids alongthe bubble line and in the homogeneous liquid. It was systematically investi-gated how anisotropy, i.e. elongation, and quadrupole momentum influence the...

2009
G. A. Fernández J. Vrabec

Equilibrium molecular dynamics simulation and the Green-Kubo formalism were used to calculate self-diffusion coefficient, shear viscosity, and thermal conductivity for 38 different dipolar two-center Lennard-Jones fluids along the bubble line and in the homogeneous liquid. It was systematically investigated how anisotropy, i.e. elongation, and dipole momentum influence the transport properties....

2016
S. Moshfeghyeganeh A. N. Cote J. J. Neumeier J. L. Cohn

Transport measurements (electrical resistivity, Seebeck coefficient, and thermal conductivity) in the temperature range 80–500 K are presented for single crystals of the quasi-one-dimensional (Q1D) semiconductor Li0.33MoO3. Opposite signs are observed for the Seebeck coefficient along the trinclinic a and c axes, with Sc Sa ’ 250 lV/K near room temperature and ’100 lV/K at 380 K. The thermal co...

2010
Neophytos Neophytou Martin Wagner Hans Kosina

The spds-spin-orbit-coupled tight-binding model and linearized Boltzmann transport theory is applied to calculate the electrical conductivity, the Seebeck coefficient, and the power factor of silicon nanowires (NWs) with diameters D<12nm. Using experimentally measured values for the lattice thermal conductivity we estimate the room temperature thermoelectric figure of merit to be ZT~1. Keywords...

A. Moradiyan H. R. Taghiyari,

Effects were studied of 200 ppm silver and copper nano-suspensions, with size range from 20 to 80 nm, on the hardness of particleboards produced at an industrial scale at the Iran-Choob Factory, Iran. Metal nano-suspensions were added to the mat at two levels of 100 and 150 milli-liters/kg dry weight wood particles, and the results were compared with those of the control panels. Results showed ...

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