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Träfflista för sökning "LAR1:umu srt2:(1975-1979)"

Sökning: LAR1:umu > (1975-1979)

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4.
  • Alm, Ove, et al. (författare)
  • Thermal conductivity of NaCl up to 40 kbar and 240-400 K
  • 1975
  • Ingår i: High Temperatures-High Pressures. - 0018-1544 .- 1472-3441. ; 7:2, s. 235-239
  • Tidskriftsartikel (refereegranskat)abstract
    • The thermal conductivity, λ, of NaCl has been measured at pressures up to 40 kbar and temperatures between 240 K and 400 K in a solid medium in a 'belt' type of high-pressure apparatus. A steady state method with axial heating of a cylindrical specimen was employed. The increase of lambda with pressure was almost linear and the ratio of the thermal conductivity at 25 kbar to that at atmospheric pressure, λ(25)/λ(0), was found to be 1.72, and independent of temperature within the experimental error.
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5.
  • Alm, Ove, et al. (författare)
  • Thermal conductivity of NaF at high pressures
  • 1979
  • Ingår i: High Temperatures-High Pressures. - 0018-1544 .- 1472-3441. ; 11, s. 339-341
  • Tidskriftsartikel (refereegranskat)abstract
    • The thermal conductivity, λ, of NaF was measured over the pressure range 0-3 GPa at room temperature. An approximately linear variation of λ with P was observed in this range, and the ratio λ(P)/λ(0) was found to be 1.12 for P = 1 GPa.
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6.
  • Andersson, Per, et al. (författare)
  • Electrical resistance of Evanohm under pressure
  • 1975
  • Ingår i: Review of Scientific Instruments. - : American Institute of Physics (AIP). - 0034-6748 .- 1089-7623. ; 46:9, s. 1292-1293
  • Tidskriftsartikel (refereegranskat)abstract
    • The electrical resistance of Evanohm wire has been determined as a function of hydrostatic pressure. A Teflon cell with a novel type of electrical feedthrough was used to contain the fluid medium. The resistance was found to decrease approximately linearly by 0.3% up to 27 kilobar. The remarkably small variation of its resistance with temperature and pressure makes Evanohm a suitable material for strain measurements under pressure.
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7.
  • Andersson, Per (författare)
  • Pressure dependence of the thermal conductivity of some polyamides
  • 1976
  • Ingår i: Macromolecular Chemistry and Physics. - Basel : Wiley. - 1022-1352 .- 1521-3935. ; 177, s. 271-277
  • Tidskriftsartikel (refereegranskat)abstract
    • The pressure dependence of the thermal conductivities of five polyamides (nylons) have been determined ina cylindrical geometry at 300 K and in the pressure range 0-25 kbar. The conductivities increase strongly with pressure, the values at 25 kbar being higher by the factors 1,83, 1,90, 2,07, and 2,03 for, respectively, nylon 66, nylon 610, nylon 6, nylon 11, and nylon 12, than those at atmospheric pressure. The results are compared with other exerimental results and with theoretical calculations. The difference in conductivity response to pressure between the different varieties is discussed.
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8.
  • Andersson, Per, et al. (författare)
  • Pressure dependence of the thermal conductivity, thermal diffusivity, and specific heat of some polymers
  • 1975
  • Ingår i: Journal of Polymer Science Polymer Physics Edition. - : Wiley. - 1542-9385 .- 0098-1273. ; 13:2, s. 243-251
  • Tidskriftsartikel (refereegranskat)abstract
    • The pressure dependence of the specific heat of poly(methyl methacrylate), polystyrene, and atactic and isotactic polypropylene was determined from simultaneous measurements of thermal conductivity and diffusivity in a cylindrical geometry at 300°K and in the pressure range 0-37 kbar. The thermal conductivity and the diffusivity both increase strongly with pressure, while the specific heat decreases. The pressure dependencies are most pronounced at low pressures. The results are compared with other experimental results and with theoretical calculations.
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9.
  • Andersson, Per (författare)
  • Thermal conductivity and heat capacity of cyclohexane under pressure
  • 1978
  • Ingår i: Journal of Physics and Chemistry of Solids. - : Elsevier. - 0022-3697 .- 1879-2553. ; 39:1, s. 65-68
  • Tidskriftsartikel (refereegranskat)abstract
    • The transient hot-wire technique was used to determine the thermal conductivity, λ, and the specific heat capacity per unit volume, ρcp, of cyclohexane up to 1.5 GPa in the range 120–340 K. The measurements were carried out in a piston-cylinder apparatus, 45 mm in internal diameter, cooled by liquid nitrogen. There is only a small (6%) increase in λ on freezing, while there is an increase by a factor of two corresponding to the plastic→ normal crystal transition. The variation of λ with temperature (T) at P = 0.03 GPa is d(lnλ)/dT = −2.2×10−3K−1 for the liquid and d(ln λ)/dT = −0.9×10−3K−1 for the plastic crystalline phase. In the normal crystal phase an approximate T−1 dependence is observed. Within each of the phases λ increases linearly with pressure, and the slope of λ (P) is smallest in the plastic crystal phase. The existence of a recently reported new high pressure phase is evident from conductivity data. Qualitative ρcp -results are reported.
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10.
  • Andersson, Per (författare)
  • Thermal conductivity and heat capacity of cyclopentane in the range 100–300 K and up to 2·1 GPa
  • 1978
  • Ingår i: Molecular Physics. - : Taylor & Francis. - 0026-8976 .- 1362-3028. ; 35:2, s. 587-591
  • Tidskriftsartikel (refereegranskat)abstract
    • The thermal conductivity, λ, and the specific heat capacity per unit volume, ρCp, of cyclopentane were determined in the range 100–300 K and up to 2.1 GPa. The transient hot-wire technique was used, and the experiments were carried out in a piston-cylinder apparatus. The λ values for the liquid and the two plastic crystalline phases are quite similar, while there is a strong increase corresponding to the plastic → normal crystal transition. In the normal crystal phase a T-1 dependence is observed, in contrast to the small variations of λ with temperature in the other phases. The pressure dependence of λ for the two plastic crystal phases shows a behaviour similar to that of the compressed liquid. Approximate ρCp data are reported. An extended phase diagram for cyclopentane is given.
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