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  • Articles  (714)
  • Articles: DFG German National Licenses  (714)
  • Life and Medical Sciences  (533)
  • thermal conductivity  (181)
  • 1995-1999  (405)
  • 1985-1989  (309)
  • 1940-1944
  • Physics  (714)
  • 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
    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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  • 3
    Electronic Resource
    Electronic Resource
    Hydrodynamic correlation functions of hard-sphere fluids at short times (1989)
    Springer
    Journal of statistical physics 57 (1989), S. 595-629 
    Details
    ISSN: 1572-9613
    Keywords: Neutron scattering function ; shear viscosity ; bulk viscosity ; thermal conductivity ; Green-Kubo integrand ; hard-sphere fluid ; short-time expansion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The short-time behavior of the coherent intermediate scattering function for a fluid of hard-sphere particles is calculated exactly through ordert 4, and the other hydrodynamic correlation functions are calculated exactly through ordert 2. It is shown that for all of the correlation functions considered the Enskog theory gives a fair approximation. Also, the initial time behavior of various Green-Kubo integrands is studied. For the shear-viscosity integrand it is found that at densitynσ3=0.837 the prediction of the Enskog theory is 32% too low. The initial value of the bulk viscosity integrand is nonzero, in contrast to the Enskog result. The initial value of the thermal conductivity integrand at high densities is predicted well by Enskog theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01022824
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Nonisothermal polymeric fluids (1996)
    Springer
    Rheologica acta 35 (1996), S. 103-109 
    Details
    ISSN: 1435-1528
    Keywords: Transport properties ; thermal conductivity ; FENE dumbbell model ; polymer solutions ; thermal diffusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The phase-space kinetic theory for polymeric liquid mixtures has been further developed for molecular models without internal constraints. The theory provides expressions for the mass, momentum, and energy fluxes, each of which may in general be influenced by concentration, velocity, and temperature gradients. To illustrate the use of these results, the thermal conductivity for a dilute polymer solution is derived; the FENE dumbbell model is used to describe the mechanical behavior of the polymer chains. The Hookean dumbbell results can be obtained by letting the “finite extensibility parameter” b tend to infinity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396036
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  • 6
    Electronic Resource
    Electronic Resource
    Probing the Upper Critical Field of κ-(BEDT-TTF)2Cu(NCS)2 (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 497-500 
    Details
    ISSN: 1572-9605
    Keywords: Organic superconductors ; Josephson plasma ; thermal conductivity ; upper critical field
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Studies of heat conduction and microwave absorption in the vortex state of κ-(BEDT-TTF)2Cu(NCS)2 reveal some of the specific aspects of superconductivity in this system. Moreover they allow us to probe the destruction of bulk superconductivity by a magnetic field. The two set of results yield identical magnitudes for the upper critical field with a temperature dependence distinctly different from the one suggested by the onset of resistive transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007771815553
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  • 7
    Electronic Resource
    Electronic Resource
    Heat conduction in Ba1−xKxBiO3 (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 445-448 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconductors ; thermal conductivity ; magnetization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We have investigated heat conduction of single crystal Ba1−xKxBiO3 in the temperature range of 2–300 K and in a magnetic field of up to 6 Tesla. Temperature dependence of thermal conductivityκ(T) reveals the participation of both electrons and phonons with their relative contributions that depend critically on the potassium doping concentration. Crystals underdoped with potassium (samples with higherT c) exhibit a strong suppression ofκ and a glass-like temperature dependence. In contrast, those with a higher potassium content (lowerT c) show an increase as temperature decreases with a peak near 23 K. Field dependence ofκ(H) is also very sensitive to the level of potassium doping. Crystals exhibiting a large phonon contribution show an initial drop inκ(H) at low fields followed by a minimum and then a slow rise to saturation as the field increases. The initial drop is due to the additional phonon scattering by magnetic vortices as the sample enters a mixed state. The high field behavior ofκ(H), arising from a continuous break-up of Cooper pairs, exhibits scaling which suggests the presence of an unconventional superconducting gap structure in this material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00722826
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  • 8
    Electronic Resource
    Electronic Resource
    The field dependence of the thermal conductivity: Evidence for nodes in the gap (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 449-452 
    Details
    ISSN: 1572-9605
    Keywords: thermal conductivity ; Andreev reflection ; vortex lines ; mixed phase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The increased thermal conductivity below Tc in YBa2Cu3O7−x (YBCO) is shown to agree with the microwave electrical conductivity, affirming that increase is due to quasiparticle conduction The field dependence, particularly in the conducting plane permits us to separate phonon and quasiparticle contributions for both YBCO and Tℓ2Ba2CuO6 single crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00722827
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  • 9
    Electronic Resource
    Electronic Resource
    The thermal conductivity of ethane in the critical region (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 409-415 
    Details
    ISSN: 1572-9567
    Keywords: critical region ; ethane ; thermal conductivity ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivity of ethane in the critical region has been measured isochorically at densities up to 1.76 times the critical density and at temperatures down to 0.13 K above the critical temperature. The measurements were performed with a thermal conductivity apparatus based on the parallelplate method. The experimental accuracy was 0.5 to 5%, depending on the distance to the critical point. The experimental results agree well with a recently developed crossover theory for the thermal diffusivity of fluids in the critical region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01133537
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  • 10
    Electronic Resource
    Electronic Resource
    A transient hot-wire method for measuring the thermal conductivity of gases and liquids (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 673-686 
    Details
    ISSN: 1572-9567
    Keywords: chlorofluorocarbons ; fluorocarbons ; nitrogen ; thermal conductivity ; toluene ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we describe a version of a transient hot-wire apparatus which employs an integrating digital voltmeter to measure the bridge out-of-balance signal. The integrating period of the voltmeter is variable and is routinely set equal to one 60-Hz power-line cycle, 16.67 ms. Use of measurement or integration periods less than an integral multiple of the power-line period results in substantially more electronic noise and a significant degradation in experimental precision. A correction to the working equation which accounts for the integration of the out-of-balance signal is also presented. The precision of the digital voltmeter used with the apparatus is ±0.1 μV, which translates into an ultimate precision of ±0.03 mK in the measured temperature rise. In practice the precision in the temperature rise is typically ±0.3 mK, which represents a moderate improvement over the precision generally obtained with transient techniques employing automatic bridge balancing schemes. Although the current apparatus is designed principally for measurements of the thermal conductivity of liquids, it can been used for gas-phase measurements, with some decrease in accuracy due to the somewhat larger heat capacity correction which must be applied to the temperature rise measurements. The operation of the instrument was verified by measuring the thermal conductivities of toluene and nitrogen. Preliminary data are presented for the new environmentally acceptable fluorocarbons such as R-134a (CF3CH2F), R-123 (CHCl2CF3), and R-141b (CCl2FCH3).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00507988
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