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  • Articles  (115)
  • thermal conductivity  (115)
  • Springer  (115)
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  • 2000-2004  (26)
  • 1995-1999  (89)
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  • Physics  (105)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (7)
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  • Articles  (115)
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  • 1
    Electronic Resource
    Electronic Resource
    Temperature and Pressure Dependencies of Thermal Transport Properties of Rocks: Implications for Uncertainties in Thermal Lithosphere Models and new Laboratory Measurements of High-Grade Rocks in the Central Fennoscandian Shield (1999)
    Springer
    Surveys in geophysics 20 (1999), S. 33-59 
    Details
    ISSN: 1573-0956
    Keywords: (AGI) ; heat flow ; lithosphere ; thermal conductivity ; thermal diffusivity ; models ; uncertainty
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Measurements on thermal conductivity and diffusivity as functions of temperature (up to 1150 K) and pressure (up to 1000 MPa) are presented for Archaean and Proterozoic mafic high-grade rocks metamorphosed in middle and lower crustal pressures, and situated in eastern Finland, central Fennoscandian Shield. Decrease of 12–20% in conductivity and 40–55% in diffusivity was recorded between room temperature and 1150 K, which can be considered as typical of phonon conductivity. Radiative heat transfer effects were not detected in these samples. Pressure dependencies of the samples are weak if compared to crystalline rocks in general, but relatively typical for mafic rocks. The temperature and pressure dependencies of thermal transport properties (data from literature and the present study) were applied in an uncertainty analysis of lithospheric conductive thermal modellings with random (Monte Carlo) simulations using a 4-layer model representative of shield lithosphere. Model parameters were varied according to predetermined probability functions and standard deviations were calculated for lithospheric temperature and heat flow density after 1500 independent simulations. The results suggest that the variations (uncertainties) in calculated temperature and heat flow density values due to variations in the temperature and pressure dependencies of conductivity are minor in comparison to the effects produced by typical variations in the room temperature value of conductivity, heat production rate or lower boundary condition values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006655023894
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal Transport in BPSCCO System Between 20 and 170 K (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 617-621 
    Details
    ISSN: 1572-9605
    Keywords: thermal conductivity ; (Bi,Pb) 2223 pellet ; thermal conductivity peak ; phonon + electron approach
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Thermal conductivity of superconducting (Bi,Pb)2223 pellet in the temperature range 20–170 K is reported. Electronic contribution to thermal conductivity in the normal state is estimated to be ∼25%. Considering both phonon and phonon + electron approach, we attempted to examine the observed nature of the temperature dependence of thermal conductivity. Our analysis strongly supports the role of phonons as well as electrons in the origin of the thermal conductivity peak in the superconducting state. Some of the microscopic quantities evaluated from the best-fit parameters obtained from phonon + electron approach give reasonable values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007837220525
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  • 3
    Electronic Resource
    Electronic Resource
    Two-dimensional gas of disks: Thermal conductivity (1996)
    Springer
    Journal of statistical physics 82 (1996), S. 1453-1466 
    Details
    ISSN: 1572-9613
    Keywords: Kinetic theory ; thermal conductivity ; molecular dynamics ; hard disks ; Enskog's Theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The phenomenon of heat conduction in a two-dimensional gas ofN hard disks is studied in the hydrostatic regime by means of nonequilibrium molecular dynamics (N ranging from 100 to 8000). For systems withN≥1500 the temperature and density profiles observed are in excellent agreement with the continuous theory, but the conductivityk differs from the one derived from Enskog's theory in a systematic way. This difference seems to slowly decrease with increasing density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02183391
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  • 4
    Electronic Resource
    Electronic Resource
    Particularities of Heat Conduction in Nanostructures (2000)
    Springer
    Journal of nanoparticle research 2 (2000), S. 199-204 
    Details
    ISSN: 1572-896X
    Keywords: nanoscale heat transfer ; nanoparticles ; nanowires ; phonons ; superlattices ; thermal conductivity ; thin films ; microscale effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract Heat conduction in nanostructures differs significantly from that in macrostructures because the characteristic length scales associated with heat carriers, i.e., the mean free path and the wavelength, are comparable to the characteristic length of nanostructures. In this communication, particularities associated with phonon heat conduction in nanostructures, the applicability of the Fourier law, and the implications of nanoscale heat transfer effects on nanotechnology are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010003718481
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  • 5
    Electronic Resource
    Electronic Resource
    Transport coefficients of air, argon-air, nitrogen-air, and oxygen-air plasmas (1995)
    Springer
    Plasma chemistry and plasma processing 15 (1995), S. 279-307 
    Details
    ISSN: 1572-8986
    Keywords: Transport coefficients ; transport properties ; viscosity ; thermal conductivity ; electrical conductivity ; diffusion coefficient ; Chapman-Etskog method ; air ; argon ; nitrogen ; oxygen ; plasma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Calculated values of the viscosity, thermal conductivity and electrical conductivity of air and mixtures of air and argon, air and nitrogen, and air and oxygen at high temperatures are presented. In addition, combined ordinary, pressure, and thermal diffusion coefficients are given for the gas mixtures. The calculations, which assione local thermodynamic equilibrium, are performed for atmospheric pressure plasmas in the temperature range from 300 to 30,000 K. The results for air plasmas are compared with those of published theoretical and experimental studies. Significant discrepancies are found with the other theoretical studies; these are attributed to differences in the collision integrals used in calculating the transport coefficients. A number of the collision integrals used here are significantly more accurate than values used previously, resulting in more reliable values of the transport coefficients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01459700
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  • 6
    Electronic Resource
    Electronic Resource
    Transport Coefficients of Hydrogen and Argon–Hydrogen Plasmas (2000)
    Springer
    Plasma chemistry and plasma processing 20 (2000), S. 279-297 
    Details
    ISSN: 1572-8986
    Keywords: Transport coefficients ; transport properties ; viscosity ; thermal conductivity ; electrical conductivity ; diffusion coefficient ; Chapman–Enskog method ; hydrogen ; argon ; plasma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Calculated values of the viscosity, thermal conductivity, and electrical conductivity of hydrogen and mixtures of argon and hydrogen at high temperatures are presented. Combined ordinary, pressure, temperature, and electric field diffusion coefficients are also given for the mixtures. The calculations, which assume local thermodynamic equilibrium, are performed for atmospheric pressure plasmas in the temperature range from 300 to 30,000 K. The results are compared with those of previously published studies. Generally, the agreement is reasonable; those discrepancies that exist are attributed to the improved values of some of the collision integrals used here in calculating the transport coefficients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007099926249
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of Cation Impurities on Thermal Conductivity of Yttria-Doped Aluminum Nitride (1998)
    Springer
    Journal of materials synthesis and processing 6 (1998), S. 315-321 
    Details
    ISSN: 1573-4870
    Keywords: Aluminum nitride ; thermal conductivity ; size effect ; impurity effect ; yttria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Effects of cation impurities such as Fe and Si on thermal conductivity of yttria-doped aluminum nitride were investigated. Two types of aluminum nitride powders, Tokuyama F-grade and Denka AP-10, were compared. The powders have similar contents of oxygen but different levels of cation impurities. Since the thermal conductivity of sintered aluminum nitride is virtually affected by the residual oxygen contents in the grains, effects of yttria additions and prolonged firing time are also investigated. The resultant thermal conductivity is thought to be influenced by the sample size of sintering bodies because extracting oxygen from the aluminum nitride lattice in larger samples requires longer time resulting from a longer diffusion path. In comparing the AlN powders, impurity contents of Fe and Si are somewhat higher in Denka powder than Tokuyama powder. These impurity elements degrade the thermal conductivity of sintered aluminum nitride. Degradation effects in thermal conductivity due to presence of Fe and Si are evaluated by artificially introducing these elements to Tokuyama AlN powder. The difference in the thermal conductivity resulting from the two types of powders is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022647109823
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  • 8
    Electronic Resource
    Electronic Resource
    In situ determination of thermal conductivity of waste rock dump material (1997)
    Springer
    Water, air & soil pollution 98 (1997), S. 345-359 
    Details
    ISSN: 1573-2932
    Keywords: thermal conductivity ; thermal diffusivity ; waste rock
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In situ determinations of thermal conductivity of waste rock dumps at three mine sites: Aitik, Sweden; Kelian, Indonesia; and Heath Steele, Canada are described. Measurements were carried out at various locations and depths at each site. The estimated thermal conductivities range from 0.62 to 1.63 W m−1K−1 with an average of 1.21±0.27 W m−1K−1 for the waste rock pile at the Aitik site, 1.04 to 1.25 W m−1K−1 with an average value of 1.17(0.11 W m−1K−1 for the Heath Steele site, and 1.57 to 2.08 W m−1K−1 with an average value of 1.89±0.21 W m−1K−1 for the Kelian site. The higher average thermal conductivity at the Kelian site could be attributed to higher moisture content in the waste rock pile because of high rainfall at this site. Thermal diffusivity was also evaluated at a region of the Aitik waste rock dump where the thermal conductivity was also determined using measured temperature profiles. The thermal diffusivity value determined this way was (5.75±0.75)×10−7m2s−1, consistent with that calculated from the thermal conductivity values determined for the same location.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02047043
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  • 9
    Electronic Resource
    Electronic Resource
    Investigation on the effective conductivities of carbon/carbon fiber composites with inhomogeneous interphase (1997)
    Springer
    Applied mathematics and mechanics 18 (1997), S. 211-220 
    Details
    ISSN: 1573-2754
    Keywords: composite ; thermal conductivity ; inhomogeneous interphase ; Mori-Tanaka method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract Thermal conductivities of carbon/carbon fiber composites with inhomogeneous interphase are studied in thtis paper. The inhomogeneous interphase is modeled approximately as a multilayered structure consisting of many thin layers having homogeneous properties, and close-formed solution of the effective conductivities of the composites is obtained by using the Mori-Tanaka mean-field concept.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453363
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  • 10
    Electronic Resource
    Electronic Resource
    Study of Nano-Porous Silicon with Low Thermal Conductivity as Thermal Insulating Material (2000)
    Springer
    Journal of porous materials 7 (2000), S. 177-182 
    Details
    ISSN: 1573-4854
    Keywords: nano-porous silicon ; thermal conductivity ; thick layers ; thermal isolation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Recently discovered phenomenon of extremely low thermal conductivity of nano-porous silicon (nano-PS) is discussed in detail. A theoretical model describing specific mechanisms of heat transport in as-prepared and oxidized nano-PS layers is described. The theoretical estimations are in a good agreement with experimental data obtained earlier. The low thermal conductivity values allow to use this promising material as thermal insulator in microsensors and microsystems. To ensure an efficient thermal isolation, a nano-PS layer has to be as thick as possible and mechanically stable. We describe here the procedures to form thick (up to 200 μm) and stable nano-PS layers. Distribution of Si oxidized fraction along the layer thickness after thermal oxidation in dry O2 atmosphere at 300°C during 1 h is studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009626518619
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