ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles  (107)
  • Other Sources
  • high pressure  (107)
  • Springer  (107)
  • American Chemical Society
  • American Geophysical Union
  • American Physical Society
  • Blackwell Publishing Ltd
  • Institute of Physics
  • National Academy of Sciences
  • 2000-2004  (7)
  • 1995-1999  (38)
  • 1985-1989  (62)
  • 1970-1974
  • 1955-1959
  • 1945-1949
  • 1935-1939
  • Physics  (107)
  • Natural Sciences in General
Collection
  • Articles  (107)
  • Other Sources
Source
Keywords
Publisher
  • Springer  (107)
  • American Chemical Society
  • American Geophysical Union
  • American Physical Society
  • Blackwell Publishing Ltd
    • +
Years
  • 2000-2004  (7)
  • 1995-1999  (38)
  • 1985-1989  (62)
  • 1970-1974
  • 1955-1959
    • +
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    UV-Vis spectroscopic study on effects of pressure for adsorption ofp-nitrotoluene at liquid-solid interface (1996)
    Springer
    Adsorption 3 (1996), S. 173-180 
    Details
    ISSN: 1572-8757
    Keywords: electronic spectra ; adsorption of liquid ; zeolites ; p-nitrotoluene ; high pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The behavior ofp-nitrotoluene adsorbed at zeolite/n-heptane interface has been investigated by the electronic spectroscopy under pressure up to 300 MPa. The uv-vis absorption bands of adsorbedp-nitrotoluene were deconvoluted into ones for the species adsorbed on the cation sites, and one for that on the pore wall of zeolite. The peak of adsorbed species on the cation site red-shifted by 20–80 nm from the position of the same species in the liquid phase, and their magnitudes of shift depended on the strength of electric field generated by the cation in zeolites. The peak intensities of adsorbed species on the cation site were enhanced but these or the pore wall site were reduced with the increase in pressure, suggesting that a part ofp-nitroluene molecules on the pore wall site desorbed and the adsorption on the cation site was enhanced by compression. The pressure dependence of peak intensity indicated that the behavior of this adsorption system was strongly governed by the solvation structure of the adsorbate in the zeolite pore. In particular, it was found that the adsorption of solvent molecules on the cation site strongly affected the volume change of the adsorption system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01650240
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Single Crystals of HgBa2Can−1CunO2n+2+δ (n=1−5) and Layers of HgBa2CuO4+δ Grown at Gas Pressure 10 kbar (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 119-122 
    Details
    ISSN: 1572-9605
    Keywords: Single crystals ; high pressure ; layers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Single crystals of Hg-12(n−l) have been grown using high-pressure gas-technique. Due to the high density of Ar gas at 10 kbar the evaporation of Hg is strongly suppresed. An influence of structure defects on magnetic properties will be discussed. Superconducting parameters λ ab ,ξ ab and γ have been studied using torque magnetometry. Layers of Hg-1201 compound have been grown from flux.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022675105920
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    An infrared spectroscopic study of lawsonite to 20 GPa (1999)
    Springer
    Physics and chemistry of minerals 26 (1999), S. 437-445 
    Details
    ISSN: 1432-2021
    Keywords: Key words lawsonite ; high pressure ; infrared spectroscopy ; hydrogen bonding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract The infrared spectrum of CaAl2Si2O7 · H2O-lawsonite, has been characterized to pressures of 20 GPa at 300 K. Our results constrain the response to compression of the silicate tetrahedra, hydroxyl units, and water molecules in this material. The asymmetric and symmetric stretching and bending vibrations of the Si2O7 groups (at zero pressure frequencies between 600 and 1000 cm−1) increase in frequency with pressure at rates between 3.6 and 5.9 cm−1/GPa. All silicate modes appear to shift continuously with pressure to 20 GPa, although the lowest frequency stretching vibration becomes unresolvable above 18 GPa, and a splitting of the main bending vibration is observed near this pressure. The O-H stretches of the hydroxyl units exhibit a discontinuity in their mode shifts at ∼8–9 GPa, which we interpret to be produced by a pressure-induced change in hydrogen bonding. The stretching and bending vibrations of the water molecule are relatively unaffected by compression to 20 GPa, thus demonstrating that the structural cavities in which water molecules reside are relatively rigid. Significant changes in the amplitude of the O-H stretches of the hydroxyl and water units are observed at this pressure as well; nevertheless, our results demonstrate that the dominant structural units in lawsonite persist metastably at 300 K with only modest structural modifications well beyond the known stability field of this phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002690050206
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    IR Reflection Spectra of Ferroelectric Ceramics Based on Solid Solutions of Lead Zirconate-Titanate (2000)
    Springer
    Journal of applied spectroscopy 67 (2000), S. 976-980 
    Details
    ISSN: 1573-8647
    Keywords: ferroelectric ceramics ; IR reflection spectra ; ferroelectric-active mode ; perovskite structure ; lead zirconate-titanate ; solid solution ; high pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated the IR reflection spectra of ferroelectric ceramics based on solid solutions of lead zirconate-titanate with a rhombohedral structure obtained by high-pressure cold precompaction. In the 55–65-cm−1 frequency range, we have revealed by experiment that the “soft” ferroelectric-active mode for the ceramics compacted by a higher pressure under the conditions of cold compaction is shifted into the region of lower frequencies. For the ceramics precompacted at various pressures, we have determined the frequencies of longitudinal and transverse phonons and calculated the frequency dependences of the imaginary and real parts of the dielectric constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004168320640
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Beyond KTB - electrical conductivity of the deep continental crust (1995)
    Springer
    Surveys in geophysics 16 (1995), S. 5-36 
    Details
    ISSN: 1573-0956
    Keywords: continental crust ; electrical conductivity ; high pressure ; high temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Great strides have been made in understanding the upper part of the crust by in-situ logging in, and laboratory experiments on core recovered from super-deep bore-holes such as the KTB. These boreholes do not extend into the lower crust, and can contribute little to the elucidation of mechanisms that produce the high electrical conductivities that are commonly observed therein by magneto-telluric (MT) methods. Laboratory studies at simulated lower crustal conditions of temperature, pressure and saturation, on electrolyte saturated rocks thought to have been derived from the lower crust, have not been possible up until now due to their experimental difficulty. It is necessary to subject electrolyte-saturated rock samples to independently controlled confining and pore-fluid pressure, which implies that the rock be sleeved in some impermeable but deformable material, that can withstand the very high temperatures required. Metals are the only materials capable of being used, but these cause great difficulties for cell sealing and conductivity measurement. In this paper we describe recent breakthroughs in experimental work, specifically the development of two new types of sophisticated metal/ceramic seal, and a conductivity measurement technique that enables the measurement of saturated rock conductivity in the presence of a highly conducting metallic sleeve. The advances in experimental technique have enabled us to obtain data on the electrical conductivity of brine saturated basic, acidic and graphite-bearing rocks at lower crustal temperatures and raised pressures. These data have facilitated the comparison of MT derived crustal electrical conductivity profiles with profiles obtained from laboratory experiments for the first time. Initial modelling shows a good agreement between laboratory derived and MT derived profiles only if the mid-crust is composed of amphibolite pervaded by aqueous fluids, and the lower crust is composed of granulite that is saturated with aqueous fluids and/or contains interconnected grain surface films of graphite. The experimental data are consistent with a three layer crust consisting of an aqueous fluid saturated acidic uppermost layer, above an aqueous fluid saturated amphibolite mid-crust, and a granulite lowermost crust, which may or may not be saturated with aqueous fluids, but if not, requires the presence of an additional conduction mechanism such as conduction through thin graphite films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00682710
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Normal stress difference in liquid lubricants sheared under high pressure (1996)
    Springer
    Rheologica acta 35 (1996), S. 13-23 
    Details
    ISSN: 1435-1528
    Keywords: Lubricants ; normal stress ; high pressure ; shear bands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Although normal stress differences in liquids have conventionally been associated with polymers, aspects of rheological behavior in lubricated concentrated contacts suggest that normal stress difference may be significant in even low molecular weight liquids sheared under high pressure and high shear stress. A torsional flow rheogoniometer was constructed for use at high (300 MPa) pressure. Four typical liquid lubricants were investigated, including one polymer/mineral oil solution. Shear stress and N 2-N 2 are reported as functions of shear rate. The effect of pressure variation is reported for two liquids. Results are compared with predictive techniques and a molecular dynamics simulation. Simple low molecular weight lubricant base oils can generate measurable and significant normal stress differences when sheared at high shear stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366549
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Influence of Sr Substitution on Structure, Hole Concentration in CuO2 Planes, and Irreversibility Line in (Hg,Pb)(Ba,Sr)2Ca2Cu3O8+δ Single Crystals (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 877-881 
    Details
    ISSN: 1572-9605
    Keywords: single crystals ; HgBa2Ca2Cu3O8+δ ; high pressure ; substitutions ; irreversibility line
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Single crystals of HgBa2Ca2Cu3O8+δ compound with partial substitution of Sr and Pb have been grown at high gas pressure. Bond valence sum calculations show that the substitution of Sr for Ba leads to a more homogeneous distribution of holes between nonequivalent CuO2 planes. In nonsubstituted crystals, the density of holes is significantly higher in the inner CuO2 planes. The irreversibility field increases on Sr substitution. The thickness of the charge reservoir decreases with Sr substitution by 0.7 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026426501425
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Localized-Itinerant and Mott–Hubbard Transitions in Several Perovskites (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 989-993 
    Details
    ISSN: 1572-9605
    Keywords: manganese oxides ; high pressure ; charge-density waves ; magnetism ; polarons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The localized-itinerant and Mott–Hubbard transitions in single-valent perovskites are distinguished. The approach to the Mott–Hubbard transition from the itinerant-electron side is characterized by the appearance of strong-correlation fluctuations within a metallic matrix; these fluctuations introduce a Curie–Weiss paramagnetism that is added to a strongly enhanced Pauli paramagnetism. As the critical bandwidth is approached, ordering of the strong-correlation fluctuations into a charge-density wave (CDW) may compete with a global Mott-Hubbard transition. The approach to the localized-itinerant electronic transition from the localized-electron side is illustrated by LaMnO3, where orbital ordering localizes the electrons of e-orbital parentage. In the mixed-valent La1−x Sr x MnO3 system, the doped holes evolve from small polarons to two-manganese Zener polarons to itinerant-electron behavior. The Zener polarons order at low temperatures into a CDW.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026462510687
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Phase behavior of the system He-N2 at high pressures (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 15-25 
    Details
    ISSN: 1572-9567
    Keywords: binary mixtures ; diamond anvil cell ; helium ; high pressure ; nitrogen ; phase equilibria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent investigation at our institute revealed that the solid-fluid-fluid three-phase line of the system helium-nitrogen shows two quadruple points in the pressure range up to 10 GPa. Since each quadruple point is connected with four three-phase lines, the phase diagram is very complicated. We have detected the phase transitions representing solid-solid-fluid equilibria. Moreover, two lines of constant composition have been determined as a function of temperature and pressure. These results are discussed together with the implications for the phase diagram of both He-N2 and pure nitrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500704
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    The thermal conductivity of propane (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 1013-1027 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; propane ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper presents thermal conductivity measurements of propane over the temperature range of 192–320 K, at pressures to 70 MPa, and densities to 15 mol · L−1, using a transient line-source instrument. The precision and reproducibility of the instrument are within ±0.5%. The measurements are estimated to be accurate to ±1.5%. A correlation of the present data, together with other available data in the range 110–580 K up to 70 MPa, including the anomalous critical region, is presented. This correlation of the over 800 data points is estimated to be accurate within ±7.5%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503170
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 11
    Electronic Resource
    Electronic Resource
    Measurements of the viscosity of new refrigerants in the temperature range 270–340 K at pressures up to 20 MPa (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 133-143 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; refrigerants ; vibrating wire ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A recently modified vibrating-wire instrument was employed to measure the liquid viscosity of a wide selection of new refrigerants under pressure. Calibration of the viscometer with water over the range of measurements confirmed that the estimated uncertainty of the measurements is 0.5%, while the precision is 0.3%. With this instrument, the viscosity of chlorofuorocarbons (CFC's) and alternative refrigerants. R11. R12. R22, R32. R124, R125. 11134a. R 141 b, and R152a, was measured over the temperature range from 270 to 340 K, from just above the saturation pressure up to 211 M Pa. The experimental data, represented by polynomial functions of temperature and pressure, are used in a comparative examination of other recently reported experimental measurements of the viscosity of all these refrigerants. to investigate the uncertainty with which the viscosity is known.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438964
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    High-pressure cylindrical acoustic resonance diffusion measurements of methane in liquid hydrocarbons (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 655-662 
    Details
    ISSN: 1572-9567
    Keywords: acoustic resonance spectroscopy ; diffusion kinetics ; high pressure ; methane ; liquid hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A novel cylindrical acoustic resonance method for the measurement of gas diffusion into liquids at high pressures is described. The measurements were per formed in a vertically oriented cylindrical acoustic resonator containing both the liquid solvent and gaseous diffusant while under high-precision isothermal and isobaric control. Individual resonance modes of the liquid column, the gas column, and the two-phase coupled fluid are resolved in the fast Fourier trans form acoustic-resonance spectrum (FFT-ARS). High-resolution acoustic spectra measured at frequent time intervals reveal the changes which accompany the diffusion fusion of gas into the liquid phase. One change, namely, the growth in length of the liquid column, results in a systematic shift to higher frequencies of axial modes in the gas column. The temporal behavior of this moving boundary, together with quantitative measurement of the flow to the gas column required to sustain the constant pressure, permits determination of the gas-into-liquid diffusion coefficient. Diffusion coefficients were determined from the change in frequency as a function of time of axial resonance modes in the gas-phase virtual cylinder as the surface of the underlying liquid phase advanced due to gas absorption. Measurements of the systems methane/n-octane, methane/n-nonane, and methane/n-decane were performed as a function of temperature at a pressure of 250 psia. Comparisons is made to results obtained elsewhere and by other methods but at the same temperatures and pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438850
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    Electronic Resource
    Electronic Resource
    Measurements of the Thermal Conductivity of HFC-125 in the Temperature Range from 300 to 515 K at Pressures up to 53 Mpa (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 375-399 
    Details
    ISSN: 1572-9567
    Keywords: coaxial cylinders ; high pressure ; refrigerants ; HFC-125 ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the thermal conductivity of HFC-125 that have been made by a coaxial cylinder cell operating in steady state are reported. The measurements of the thermal conductivity of HFC-125 were performed along several quasi-isotherms between 300 and 515 K in the gas phase and the liquid phase. The pressure range covered varies from 0.1 to 53 MPa. Based on the measurement of more than 600 points, an empirical equation is provided to describe the thermal conductivity outside the critical region as a function of temperature and density. A careful analysis of the various sources of error leads to an estimated uncertainty of approximately ± 1.5%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022692601764
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    The melting parameters of high-temperature nonmetallic nitrides (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 507-513 
    Details
    ISSN: 1572-9567
    Keywords: aluminium ; boron ; high pressure ; high temperature ; melting parameters ; nitrides ; silicon ; thermogram
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ranges of temperatures and pressures for the existence of condensed boron, aluminum, and silicon nonmetallic nitrides in thermodynamic equilibrium with an ambient gas were calculated on the basis of reference data. The melting parameters of the high-temperature nitrides mentioned above were investigated experimentally in the nitrogen pressure range of 5–200 MPa. The 99% purity nitride samples were prepared in the form of 4 x 4-mm plates with a thickness of 1 mm. The surfaces of samples were heated with stationary laser beam and analyzed by X-ray technique. The brightness temperature of nonmetallic nitrides was measured at 0.633-µm wavelength using the optical pyrometry method. The apparent melting temperatures were found from the analysis of heating and cooling thermograms. Based on the available literature data on normal spectral emmissivity, the true melting temperatures of nonmetallic nitrides were estimated as 3370 K for BN, 3025 K for AIN, and 2775 K for Si3N4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01443407
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    Compressibilities of ternary mixtures C1-nC16-CO2 under pressure from ultrasonic measurements of sound speed (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 851-871 
    Details
    ISSN: 1572-9567
    Keywords: compressibility ; equation of state ; high pressure ; speed of sound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Speed of sound measurements have been performed on three mixtures of the ternary system methane + carbon dioxide + normal hexadecane. The systems have been investigated from 12 to 70 MPa in the temperature range from 313 to 393 K. Furthermore, these measurements have allowed the evaluation of the isothermal and the isentropic compressibilities up to 70 MPa from low pressure (〈40-MPa) density data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439193
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 16
    Electronic Resource
    Electronic Resource
    High-temperature, high-pressure thermophysical measurements on liquid zinc (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 987-1000 
    Details
    ISSN: 1572-9567
    Keywords: critical point ; electrical resistivity ; enthalpy ; high pressure ; high temperature ; liquid metals ; zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Wire-shaped zinc samples were resistively volume heated as part of a fast-capacitor discharge circuit. Time-resolved measurements with submicrosecond resolution of the current through the specimen, the voltage drop across it, and the thermal expansion of the specimen as a function of time allow determination of the enthalpy, electrical resistivity, and density at different temperatures up to superheated liquid states of zinc far above the normal boiling point. High static pressures, up to 3800 bar of the ambient medium water, were used. An estimate of the critical pressure for zinc is given by investigations of the stability of the sample with a framing CCD camera, taking pictures of different samples varying the ambient static pressure. The critical volume and the critical temperature are obtained by means of an extrapolation of measured data at different pressures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01441988
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 17
    Electronic Resource
    Electronic Resource
    pρT Measurements of Polyethylene Glycol Dimethylethers Between 278.15 and 328.15 K at Pressures to 12 MPa (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 831-851 
    Details
    ISSN: 1572-9567
    Keywords: density ; high pressure ; internal pressure ; isobaric thermal expansion coefficients ; isothermal compressibilities ; liquid ; polyethylene glycol dimethylethers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we present a new experimental apparatus designed to measure pressure–density–temperature (pρT ) properties with a high-pressure vibrating tube densimeter. Data reliability has been verified by comparing our experimental results for methanol, n-heptane, toluene, and HFC-134a with literature data. In this work we also report new experimental densities from 278.15 to 328.15 K, and up to 12 MPa, of triethylene glycol dimethylether (TrEGDME) and tetraethylene glycol dimethylether (TEGDME). The isobaric thermal expansion coefficients, isothermal compressibility, and internal pressure have been calculated. The dependence of these properties on the length of polyethylene glycol dimethylether, CH3O–((CH2)2O) n –CH3, is analyzed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006606122944
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 18
    Electronic Resource
    Electronic Resource
    Thermal conductivity of B2O3 glass under pressure (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 267-273 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; thermal conductivity ; vitreous boron trioxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivity, λ, of vitreous boron trioxide was measured, using a hot-wire procedure, from 170 to 570 K and under pressures of up to 1.7 GPa. The thermal conductivity at room temperature and zero pressure was found to be 0.52 W · m−1 · K−1. The values of the logarithmic pressure derivative, g = d(ln λ)/d(ln ρ), where ρ is the density, were found to be 1.1 for uncompacted glass and 0.7 for glass compacted to 1.2 GPa. The variation of λ with temperature at constant density was approximately linear, with a positive slope of 1.38×10−3W·m−1·K−2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00522148
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 19
    Electronic Resource
    Electronic Resource
    p, V, T and derived thermodynamic data for toluene, trichloromethane, dichloromethane, acetonitrile, aniline, and n-dodecane (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 331-351 
    Details
    ISSN: 1572-9567
    Keywords: acetonitrile ; aniline ; dichloromethane ; high pressure ; n-dodecane ; p,V,T data ; toluene ; trichloromethane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experimentally determined p,V,T data are reported for toluene, trichloromethane, dichloromethane, acetonitrile, aniline, and n-dodecane at 278, 288, 298, 313, and 323 K, except for dichloromethane, for which the highest temperature was 298 K. At each temperature, measurements were done at pressures up to about 280 MPa or (for aniline and n-dodecane) at a lower pressure slightly below the freezing pressure at the temperature of measurement. Values of the isobaric expansivity isothermal compressibility and (for toluene, trichloromethane, dichloromethane, and acetonitrile) internal pressure, derived from the p,V,T data, are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500267
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 20
    Electronic Resource
    Electronic Resource
    Vapor-liquid equilibrium and volumetric properties calculations for solutions in the supercritical carbon dioxide (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 635-646 
    Details
    ISSN: 1572-9567
    Keywords: carbon dioxide ; critical phenomena ; equations of state ; high pressure ; phase equilibria ; solutions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The calculations of gas solubilities in supercritical solvents require equations of state remaining accurate in the critical range, which are difficult to obtain with classical models. In this work, the Helmholtz energy of a mixture is considered as the sum of the Helmholtz energies of pure components taken at a constant packing fraction and of a residual term which may have the form of a RedlichKister, Van Laar, NRTL, UNIQUAC, or UNIFAC function. Thus it is possible to assign to a given component an equation of state whose form is different from that of the others. This model has been applied to binary systems containing supercritical carbon dioxide. The results are improved with respect to those obtained with the classical model for vapor-liquid equilibria and for volumetric properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00502396
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 21
    Electronic Resource
    Electronic Resource
    p, V, T and derived thermodynamic data for bromobenzene at temperatures from 278 to 323 K and pressures up to 280 MPa (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 557-565 
    Details
    ISSN: 1572-9567
    Keywords: bromobenzene ; hard-sphere diameter ; high pressure ; internal pressure ; isobaric expansivity ; isothermal compressibility ; p, V, T data
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experimentally determined p, V, T data are reported for bromobenzene at 278, 288, 298, 313, and 323 K, at pressures up to about 280 MPa or (at 278 and 288 K) a lower pressure slightly below the freezing pressure at the temperature of measurement. Values of the isobaric expansivity, isothermal compressibility, internal pressure, and equivalent hard-sphere diameter, derived from the p, V, T data, are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503642
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 22
    Electronic Resource
    Electronic Resource
    Temperature and pressure effects on the thermal conductivity of TlCl and TlBr (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 607-620 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; hot-wire method ; thallium bromide (TlBr) ; thallium chloride (TlCl) ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hot-wire method was used to measure the thermal conductivity of both TlCl and TlBr. The measurements were performed in the temperature range 120–300 K and at pressures up to 2.3 GPa. An analysis of the thermal conductivity data showed that the Leibfried-Schlömann formula is a better description for TlBr than for TlCl. For both TlBr and TlCl the effect of optic phonons on thermal conductivity cannot be ignored.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503646
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 23
    Electronic Resource
    Electronic Resource
    Solid-liquid phase equilibria of (α-methylnaphthalene + β-methylnaphthalene) and (chlorobenzene + bromobenzene) systems under high Pressures (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 671-680 
    Details
    ISSN: 1572-9567
    Keywords: bromobenzene ; chlorobenzene ; high pressure ; α-methylnaphthalene ; β-methylnaphthalene ; solid-liquid phase equilibrium ; solid solution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid-liquid phase equilibria of the (α-methylnaphthalene + β-methylnaphthalene) and the (chlorobenzene + bromobenzene) systems have been investigated at temperatures from 278 to 343 K and pressures up to 500 MPa using a high-pressure optical vessel. The uncertainties of the measurements of temperature, pressure, and composition were within ±0.1 K, ±0.5 MPa, and ±0.001 mole fraction, respectively. In both systems, the freezing and melting pressures at a constant composition increase almost linearly with increasing temperatures. In the former system, where the two components can form a solid solution with one another to a limit extent, the eutectic point shifts to a higher temperature and to a α-methylnaphthalene-rich composition with increasing pressures. In the latter system, where the two components are completely soluble in each other in the solid phase, the freezing points of all mixtures lie between those of the pure components at each pressure. It is found that the coexistence curves obtained can be expressed by a quadratic equation in pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500787
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 24
    Electronic Resource
    Electronic Resource
    Thermal conductivity and thermal diffusivity of xylene isomers in the temperature range 308–360 K at pressures up to 0.38 GPa (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 21-35 
    Details
    ISSN: 1572-9567
    Keywords: heat capacity ; high pressure ; m-xylene ; o-xylene ; p-xylene ; thermal conductivity ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New, absolute measurements of the thermal conductivity of the three xylene isomers within the temperature range 308–360 K for pressures up to 0.38 GPa are reported. In addition, for two of the isomers, m-xylene and p-xylene, it has been possible to measure the thermal diffusivity simultaneously within the same range of conditions. The accuracy of the thermal conductivity data reported is one of ±0.3%, whereas for the thermal diffusivity the estimated accuracy is ±6%. It is found that the density dependence of the thermal conductivity for all of the xylenes can be well represented by one equation based on a rigid-sphere model in the same way that has proved successful for normal alkanes. The thermal diffusivity data have been employed to derive heat capacities for the xylenes over a range of pressures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503997
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 25
    Electronic Resource
    Electronic Resource
    Thermal conductivity of steam from 250 to 510°C at pressures up to 95 MPa including the critical region (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 283-292 
    Details
    ISSN: 1572-9567
    Keywords: critical range ; high pressure ; thermal conductivity ; steam
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New measurements of the thermal conductivity of steam have been performed in the temperature range 250–510°C and in the pressure range from 1 up to 95 MPa. Most of the measurements were taken at temperatures greater than the critical temperature, where the enhancement of the thermal conductivity is observed. The experimental values are compared to the IAPS formulation for the thermal conductivity of water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503942
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 26
    Electronic Resource
    Electronic Resource
    Thermodynamic Properties of Air from 60 to 2000 K at Pressures up to 2000 MPa (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 217-228 
    Details
    ISSN: 1572-9567
    Keywords: air ; equation of state ; fundamental equation ; high pressure ; high temperature ; thermodynamic properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A thermodynamic property formulation for standard dry air based upon experimental P–ρ–T, heat capacity, and speed of sound data and predicted values, which extends the range of prior formulations to higher pressures and temperatures, is presented. This formulation is valid for temperatures from the solidification temperature at the bubble point curve (59.75 K) to 2000 K at pressures up to 2000 MPa. In the absence of experimental air data above 873 K and 70 MPa, air properties were predicted from nitrogen data. These values were included in the fit to extend the range of the fundamental equation. Experimental shock tube measurements ensure reasonable extrapolated properties up to temperatures and pressures of 5000 K and 28 GPa. In the range from the solidification point to 873 K at pressures to 70 MPa, the estimated uncertainty of density values calculated with the fundamental equation for the vapor is ±0.1%. The uncertainty in calculated liquid densities is ±0.2%. The estimated uncertainty of calculated heat capacities is ±1% and that for calculated speed of sound values is ±0.2%. At temperatures above 873 K and 70 MPa, the estimated uncertainty of calculated density values is ±0.5%, increasing to ±1% at 2000 K and 2000 MPa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021450818807
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 27
    Electronic Resource
    Electronic Resource
    Transport properties of nonelectrolyte liquid mixtures—VII. Viscosity coefficients for isooctane and for equimolar mixtures of isooctane + n-octane and isooctane + n-dodecane from 25 to 100°C at pressures up to 500 MPa or to the freezing pressure (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 233-250 
    Details
    ISSN: 1572-9567
    Keywords: free volume ; Grunberg and Nissan equation ; high pressure ; isooctane ; n-dodecane ; n-octane ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Changes in the high-pressure self-centering falling-body viscometer system, and the new automated data logging system, are described. Viscosity coefficient measurements made with an estimated accuracy of ± 2 % are reported for isooctane and for equimolar mixtures of isooctane + n-octane and isooctane + n-dodecane at 25, 50, 75, and 100°C at pressures up to 500 MPa or to the freezing pressure. The pressure dependence of the results is found to be represented equally well by the recent equation of Makita and by a free-volume form of equation. The Grunberg and Nissan equation gives a good fit to the mixture viscosity coefficient data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00522146
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 28
    Electronic Resource
    Electronic Resource
    Evaluation of the thermodynamic properties of tungsten (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 395-409 
    Details
    ISSN: 1572-9567
    Keywords: enthalpy ; equation of state ; heat capacity ; high pressure ; high temperature ; thermodynamic properties ; tungsten
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new evaluation of the thermodynamic properties of tungsten has been made. A set of parameters describing the Gibbs energy of each individual phase as a function of temperature and pressure is given. The experimental information on the P, T phase diagram and the thermodynamic data are compared with calculations made using the presented set of parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500270
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 29
    Electronic Resource
    Electronic Resource
    Shear viscosity of methanol and methanol + water mixtures under pressure (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 439-450 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; methanol ; mixtures ; viscosity ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Shear viscosities have been measured for methanol up to 400 MPa at 298, 313, and 323 K and for methanol-water mixtures (a) at 0.1 MPa and 278 K and (b) up to 300 MPa at 298 K. Where a comparison is possible the results are in good agreement with literature data. The data for the mixtures are discussed in terms of hydrogen bonding in methanol and water and by the use of excess viscosities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00508889
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 30
    Electronic Resource
    Electronic Resource
    Specific heats (C v) of saturated and compressed liquid and vapor carbon dioxide (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 1163-1182 
    Details
    ISSN: 1572-9567
    Keywords: adiabatic calorimetry ; carbon dioxide ; heat capacity ; high pressure ; saturated liquid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Specific heats of saturated liquid carbon dioxide (C sat) have been measured in the temperature range 220 to 303 K. Specific heats at constant volume (C v) have been measured at 12 densities ranging from 0.2 to 2.5 times the critical density in the temperature range 233 to 330 K, with pressures varying from 3.4 to 32 MPa. The measurements have been conducted in an adiabatic constant-volume calorimeter of conventional design. Uncertainty of the specific heats is estimated to not exceed 2.0%. Comparisons are made with an extended Benedict-Webb-Rubin equation of state and with the results of other workers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503973
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 31
    Electronic Resource
    Electronic Resource
    Phase behavior of mixtures at very high pressures (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 1-14 
    Details
    ISSN: 1572-9567
    Keywords: diamond anvil cell ; high pressure ; mixtures ; phase equilibria ; solutions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The invention of the diamond anvil cell (DAC) has been an enormous stimulus to high-pressure research. This technique has only recently been used to investigate the behavior of binary systems, probably because of the extra experimental problems which arise in the study of mixtures. It will be shown that a variety of aspects of the behavior of the mixture can, nevertheless, be studied under extreme conditions. Although the first investigations were carried out only recently, some very interesting results have already been obtained. A variety of two-components systems has been studied, e.g., He-Kr, Ne-Xe, He-H2, NH3-H2O, and N2-He2. Some of these results are discussed. Finally, a comparison is made between experimental results and theoretical calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500703
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 32
    Electronic Resource
    Electronic Resource
    Effect of pressure on the solid-liquid phase equilibria of binary organic systems (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 27-34 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; mixtures ; organic liquid ; phase equilibrium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid-liquid phase equilibria of the binary mixtures of the organic liquids have been investigated at temperatures from 278 to 343 K and pressures up to 500 MPa using a high-pressure optical vessel. The systems investigated are as follows: (1) simple eutectic systems-benzene + cyclohexane system and benzene + 2-methyl-2-propanol system; (2) eutectic systems with formation of intermolecular compounds — carbon tetrachloride + p-xylene system and carbon tetrachloride + benzene system; (3) partial solid solution system-α-methylnaphthalene + β-methylnaphthalene system; and (4) complete solid solution system-chlorobenzene + bromobenzene system. The uncertainties of the measurements of temperature, pressure and composition are within ±0.1 K, ± 0.5 MPa, and ±0.001 mole fraction, respectively. The freezing and melting temperatures at a constant composition increase monotonously with pressure. The eutectic mixture becomes richer in the component whose temperature coefficient of the freezing pressure is larger and the eutectic temperature rises monotonously with increasing pressure in the eutectic systems. The pressure-temperature-composition relation of the solid-liquid phase equilibria can be expressed satisfactorily by an equation newly proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500705
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 33
    Electronic Resource
    Electronic Resource
    Theoretical description of the graphite, diamond, and liquid phases of carbon (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 227-236 
    Details
    ISSN: 1572-9567
    Keywords: carbon phases ; diamond ; electronic effects ; graphite ; melting ; high pressure ; high temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A three-phase equation-of-state model, to be used in high-pressure high-density simulations of systems containing carbon, is described for the system graphite-diamond-liquid. The solid phases are represented by cold lattice and thermal energy terms. Simple additivity of the energy terms is assumed and the cold curve is a modified Birch form. Liquid states for diamond and graphite are obtained by a previously described scaling model. The actual Gibbs free energy of the liquid state uses the free energy of these liquids in a mixture model that includes an entropy of mixing and a pressure-dependent strain term. It is noted that the thermal expansion coefficient and the Grüneisen gamma increase faster above 3000 K than the usual approximation for the volume dependence would predict. The result is a phase diagram that fits all available data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500721
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 34
    Electronic Resource
    Electronic Resource
    Density and viscosity of linear perfluoropolyethers under high pressures (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 857-870 
    Details
    ISSN: 1572-9567
    Keywords: compressibility ; density ; fluorocarbon oil ; free-volume equation ; high pressure ; perfluoropolyether ; specific volume ; Tait equation ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New experimental data on the density and viscosity of linear, unbranched perfluoropolyethers are presented at temperatures from 273 to 333 K and pressures up to 180 MPa. The measurements were carried out by a high-pressure burrette apparatus and a falling-cylinder viscometer. The uncertainties of the measurements are estimated to be less than 0.09% for the specific volume and 2.5% for the viscosity. The P-V data at each temperature are correlated satisfactorily by the Tait equation. The viscosity data are also analyzed and correlated with pressure or molar volume by several empirical and theoretical equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00514481
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 35
    Electronic Resource
    Electronic Resource
    A new, accurate single-sinker densitometer for temperatures from 233 to 523 K at pressures up to 30 MPa (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 399-411 
    Details
    ISSN: 1572-9567
    Keywords: density ; high pressure ; high temperature ; magnetic suspension balance ; single-sinker densitometer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new apparatus for density measurements of fluids in the entire range from gas to liquid densities is presented. The instrument is a single-sinker buoyancy densitometer designed in a completely new way. The buoyancy force exerted by the sample fluid on an immersed sinker (buoy) is transferred by a new type of magnetic suspension coupling to an analytical balance. In order to reduce drastically the linearity error of the (commercial) balance. a special basic load compensation is applied which also avoids any buoyancy ellèct of the laboratory air on the balance. The new single-sinker densitometer covers a density range from 10 to 200(1 kg - m ' at temperatures from 233 to 523 K and pressures up to 30 MPa. A special compact version of such a single-sinker densitometer can even he used at temperatures from 80 to 523 K at pressures up to 100 MPa. Test measurements on densities of carbon dioxide at 233, 360, and 523 K at pressures up to 30 MPa show that the estimated total uncertainty of ±0.02% to ±0.03% in density is clearly met.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01441906
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 36
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of the generalized Murnaghan equation of state of solids (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 1009-1026 
    Details
    ISSN: 1572-9567
    Keywords: Anderson-Grüneisen ; bulk modulus ; equation of state ; expansivity ; high pressure ; Murnaghan equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the Murnaghan approximation, an isothermal relation between pressure (P) and volume (V) for solids is derived from the assumption that the isothermal bulk modulus (B) is a linear function ofP. This paper presents a thermodynamic analysis of a generalized form of the equation, based on treating all its various parameters [viz., V, B, and (∂B/∂P) T atP=0] as functions of temperature. Extending a previous study, the effect ofT upon (∂B/∂P) T is accounted for by using a dimensionless parameter introduced by us, which is used in formulating general expressions for the volume dependence of various thermophysical quantities,viz., the thermal expansion coefficient (α), the productαB, and the Grüneisen and Anderson-Grüneisen parameters. Some combinations of these parameters are identified, which show a simple dependence uponP. The new expressions are used in analyzing current approximations and the behavior of the solid in the low-compression range. In particular, an expression forα at highP is reported which generalizes the Anderson equation and previous results by us.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02093479
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 37
    Electronic Resource
    Electronic Resource
    Correlation and prediction of dense fluid transport coefficients. VII. Refrigerants (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 761-772 
    Details
    ISSN: 1572-9567
    Keywords: density ; high pressure ; refrigerants ; Tail equation ; thermal conductivity ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A recently developed scheme, based on considerations of hard-sphere theory, is used for the simultaneous correlation of the coefficients of viscosity and thermal conductivity for the refrigerants R11, R12, R22, R32. R124, R125, R134a, R141b, and R152a in excellent agreement with experiment, over extended temperature and pressure ranges. Values for the roughness factors and correlations for the characteristic volume are presented. The overall average absolute deviations of the experimental viscosity and thermal conductivity measurements from those calculated by the correlation are 2.1 and 2.3%, respectively, over a temperature range from 200 to about 10 K below the critical temperature and a pressure range from saturation to about 40 MPa. Since the proposed scheme is based on recent and accurate density values, a Tail-type equation was also employed to correlate successfully the density of the refrigerants. The overall average absolute deviation of the experimental density measurements from those calculated by the correlation is ±0.08%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438861
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 38
    Electronic Resource
    Electronic Resource
    Measurements of the thermal conductivity of liquid R32, R124, R125, and R141b (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 851-865 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; refrigerants ; R32 ; R124 ; R125 ; R141b ; thermal conductivity ; transient hot-wire technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper reports measurements of the thermal conductivity of refrigerants R32, R124, R125, and R141b in the liquid phase. The measurements, covering a temperature range from 253 to 334 K and pressure up to 20 MPa, have been performed in a transient hotwire instrument employing two anodized tantalum wires. The uncertainty of the present thermal-conductivity data is estimated to be ±0.5%. The experimental data have been represented by polynomial functions of temperature and pressure for the purposes of interpolation. A comparison with other recent measurements is also included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02093468
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 39
    Electronic Resource
    Electronic Resource
    Raman investigation of the supercritical mixture He-H2 (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 965-971 
    Details
    ISSN: 1572-9567
    Keywords: concentration fluctuations ; critical line broadening ; high pressure ; hydrogen-helium ; mixtures ; Raman spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigated the vibrational Raman spectrum of H2 in the binary mixture He-H2. The Q1-line was measured between 150 and 350 K for two isobars in the gigapascal region in a mixture of critical composition. The results indicate a broadening of the spectrum due to critical concentration fluctuations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02093476
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 40
    Electronic Resource
    Electronic Resource
    Inter- and intradiffusion in liquid mixtures of methane andn-decane (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 1213-1224 
    Details
    ISSN: 1572-9567
    Keywords: alkanes ; diffusion ; high pressure ; mixtures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The interdiffusion coefficient,D 12, has been measured by Mach-Zehnder interferometry for liquid mixtures of methane andn-decane at 303 K. The mole fraction of methane was from 0.11 to 0.96 and the pressure was from 30 to 60 MPa. This includes measurements in the critical region, the critical locus being approached from supercritical pressures to within 0.4 MPa. The accuracy inD 12 is estimated to be from 3 to 10%, depending on the composition. Our data are compared with the Sigmund correlation, which is widely used to estimate diffusion coefficients in hydrocarbons at high pressures. The deviation between estimate and measurement is one order of magnitude for some of the states. We have also compared with a more recent correlation used by Erkey, but this one is not found to be applicable to the compositions studied in the present work. Our data were related to recently measured intradiffusion coefficients,D 1 andD 2, at the same state points. On this basis, we have evaluated different mixing rules for obtaining the interdiffusion coefficient from intradiffusion coefficients, both close to and away from the critical region. It is found that the so-called Darken and Adamson relations have the right qualitative behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02081289
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 41
    Electronic Resource
    Electronic Resource
    Determination of the viscosity of various hydrocarbons and mixtures of hydrocarbons versus temperature and pressure (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 1309-1334 
    Details
    ISSN: 1572-9567
    Keywords: density ; high pressure ; hydrocarbons ; mixtures ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The dynamic viscosityη and densityρ of 10 pure substances and three binary systems were measured as a function of temperatureT (298.15, 313.15, 333.15, 353.15, and 363.15 K.) and pressureP (⩽100 MPa). The pure substances were toluene,p-xylene,m-xylene,o-xylene, methylcyclohexane, methylnaphthalene, decahydronaphthalene, phenyldodecane, heptamethylnonane, and tetramethylpentadecane (pristane). The three binaries were toluene + tetramethylpentadecane, toluene + methylnaphthalene, and toluene + heptamethylnonane, for molar fractionsx of toluene ranging between 0 and 1. The three binaries are highly “contrasted” systems, i.e., systems in which the viscosities of the pure components are very different for eachP, T pair. In all, 547 experimental determinations were carried out (279 experimental data for viscosity of the pure substances and 268 data concerning the mixtures: x⊋0 and 1).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02083543
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 42
    Electronic Resource
    Electronic Resource
    Silica under very large positive and negative pressures: Molecular dynamics simulations on parallel computers (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 169-178 
    Details
    ISSN: 1572-9567
    Keywords: densified silica ; fast multipole method ; fracture ; high pressure ; intermediate range order ; kinetic roughening ; molecular dynamics ; multiresolution algorithms ; parallel computing ; porous silica ; structural transformations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A highly efficient multiresolution algorithm has been developed to carry out large-scale molecular dynamics (MD) simulations for systems with long-range Coulomb and three-body covalent interactions. The algorithm combines the reduced cell and fast multipole methods and multiple time-step approach. Pressure-induced structural transformation, loss of intermediate range order, and dynamcal correlations in SiO2, glass are investigated with the moleculardynamics method. At twice the normal density, the Si-O bond length increases, the Si O coordination changes from 4 to 6, and the O-Si-O band-angle changes from 109 to 90°. This is a tetrahedral-to-octahedral transformation, which was reported by Meade, Hemley, and Mao. Results for phonon density of states also reveal significant changes at high pressures. The multiresolution MD approach has been used to investigate the structural properties and mechanical failure in microporous silica. Structural correlations are characterized by the fractal dimension, internal surface area, and pore surface-tovolume ratio. Critical behavior at fracture is analyzed in terms of pore percolation, and kinetic roughening of fractured surface is also investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01448219
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 43
    Electronic Resource
    Electronic Resource
    Volumetric properties of mixtures of 1,4-dioxane and water at high pressures (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 441-454 
    Details
    ISSN: 1572-9567
    Keywords: aqueous solutions ; compressibility ; density ; dioxane ; high pressure ; partial molar volume
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Densities of aqueous of 1,4-dioxane have been measured at temperatures from 298 to 348 K and at pressures up to 40 MPa by a vibrating-tube method. Molar volumes obtained with an estimated uncertainty of ±0.2°,% are correlated with pressure by the Tait equation within the experimental uncertainty. Pressure and composition dependences of the excess molar volume, partial molar volume, and isothermal compressibility are determined and they are compared with those of other aqueous solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01443402
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 44
    Electronic Resource
    Electronic Resource
    Dependence of the Melting Temperature on Pressure up to 2000 Bar in Uranium Dioxide, Tungsten, and Graphite (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 1177-1188 
    Details
    ISSN: 1572-9567
    Keywords: graphite ; high pressure ; laser pulse ; melting point ; tungsten ; uranium dioxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The melting points of uranium dioxide, tungsten, and graphite were measured as a function of the isostatic pressure up to 2000 bar (200 MPa), in a laser-heated autoclave filled with inert gas. The measured melting curves and their slopes were compared with predictions obtained from the Clausius–Clapeyron equation and existing thermochemical data of these substances. While for tungsten and graphite the results show reasonable agreement with the equilibrium thermodynamic calculations, the melting point of UO2 increases with pressure with a slope more than three times larger than expected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022667206867
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 45
    Electronic Resource
    Electronic Resource
    Melting-Point Measurements at High Static Pressures from Laser Heating Methods: Application to Uranium (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 1189-1198 
    Details
    ISSN: 1572-9567
    Keywords: diamond anvil cell ; emissivity ; high pressure ; laser heating ; melting ; uranium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two experimental approaches dealing with the determination of melting at high static pressures are described and analyzed. With the sample squeezed inside a diamond anvil cell, high temperatures up to the solid–liquid transition are obtained using Nd:YAG laser heating. Two methods have been investigated. In the first technique, the heating is accomplished with a pulsed laser and the brief radiation variations (t〈10 ms) emitted from the sample are recorded with two high-speed infrared detectors. The melting location is defined by a plateau or changes of slope of the signals, and the temperatures are calculated by assuming a constant value of emissivity factor at the end of the transition over the studied pressure range. The second system employs a continuous laser and a two-dimensional CCD detector to measure temperatures using multispectral pyrometry. Melting is detected from criteria related either to textural change in the sample involving interference contrast under a laser illumination or to the specific variations of temperature and emissivity as a function of laser power. Thermal radiation is fitted to Planck's law with temperature and emissivity as the free parameters. Advantages and drawbacks are presented from results obtained on pure uranium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022619323705
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 46
    Electronic Resource
    Electronic Resource
    Viscosity and Excess Volume at High Pressures in Associative Binaries (1998)
    Springer
    International journal of thermophysics 19 (1998), S. 161-189 
    Details
    ISSN: 1572-9567
    Keywords: excess activation energy of flow ; excess volume ; high pressure ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The dynamic viscosity η and the density ρ of three pure substances (water, 2-propanol, diacetone alcohol) and the three associated binaries were measured versus temperature T (303.15, 323.15, and 343.15 K) and pressure P. For the binary systems the mole fractions x of each component were, successively, 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1. For viscosity the experimental results (P≤100 MPa) represent a total of 540 data points: 54 for the pure substances and 486 for the binary mixtures (x≠0 and x≠1). For density the experimental results (P≤70 MPa) represent 1260 values: 126 for the pure substances and 1134 for the binary mixtures (x≠0 and x≠1). The mixtures with water are highly associative and the curves for the variation of η with composition exhibit a maxima. The variations of the excess activation energy of viscous flow ΔG E are discussed. Moreover, the measurements of ρ are sufficiently accurate to determine the excess volumes V E versus pressure, temperature, and composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021455203728
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 47
    Electronic Resource
    Electronic Resource
    Thermal conductivity and heat capacity of solid nabr under pressure (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 177-190 
    Details
    ISSN: 1572-9567
    Keywords: heat capacity ; high pressure ; sodium bromide (NaBr) ; thermal conductivity ; thermal expansivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the transient hot-wire method, measurements were made for solid NaBr of both the thermal conductivity and the heat capacity per unit volume. The measurements were performed in the temperature range 100 to 400 K and at pressures up to 2 GPa. An adiabatic compression technique allowed the determination of the thermal expansivity as a function of pressure at room temperature. The heat capacity did not vary with pressure. Analysis of the thermal conductivity data showed that it can be described adequately by the Leibfried-Schlömann formula. For temperatures up to 400 K only acoustic modes needed to be taken into account. A small contribution of optic modes to the heat transport might be apparent at the highest temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500030
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 48
    Electronic Resource
    Electronic Resource
    Thermal conductivity of solid NaF under high pressure (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 353-365 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; sodium fluoride (NaF) ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivity (λ) of solid NaF has been measured over the temperature (T) range 100–350 K and at pressures (P) up to 2.5 GPa, using the transient hot-wire method. Results for λ(T,P) could be described to a good approximation by the Leibfried-Schlömann formula. It was found that the isochoric temperature derivative of the thermal resistivity W (= λ−1) increased systematically with the mass ratio for the B1-type phases of the sodium and potassium halides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500268
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 49
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of chromium (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 411-419 
    Details
    ISSN: 1572-9567
    Keywords: chromium ; enthalpy ; heat capacity ; high pressure ; high temperature ; thermodynamic properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper is intended as a short review of the results of thermodynamic measurements available for pure chromium. The various experimental data are combined and a set of parameters describing the Gibbs energy of each individual phase as a function of temperature and pressure is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500271
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 50
    Electronic Resource
    Electronic Resource
    Thermal conductivity of ethane in the critical region (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 293-304 
    Details
    ISSN: 1572-9567
    Keywords: critical region ; ethane ; high pressure ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A coaxial cylinder method was used to measure the thermal conductivity of ethane in the pressure range from 10 up to 280 bar and in the temperature range from 308 up to 365 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503943
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 51
    Electronic Resource
    Electronic Resource
    Solid-liquid phase equilibria of benzene + cyclohexane system under high pressures (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 415-424 
    Details
    ISSN: 1572-9567
    Keywords: benzene ; cyclohexane ; eutectic point ; high pressure ; solid-liquid phase equilibrium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid-liquid phase equilibria of the benzene + cyclohexane system have been investigated experimentally at temperatures from 278 to 323 K and pressures up to 500 MPa using a newly designed optical vessel. The uncertainties of the measurements of temperature, pressure, and composition are within ±0.1 K, ±0.5 MPa, and ±0.001 mole fraction, respectively. The solid-liquid equilibrium pressure at a constant composition increases almost linearly with increasin temperature. The eutectic point shifts to a higher temperature and to a benzenerich composition with increasing pressure. This trend is found to agree with the direction predicted by the van Laar equation. The solid-liquid coexistence curves can be expressed by the Wilson equation with a mean deviation of 0.007 and a maximum deviation of 0.029 in mole fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567102
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 52
    Electronic Resource
    Electronic Resource
    Freezing pressures, p, V, T, and self-diffusion data at 298 and 313 K and pressures up to 300 MPa for 1,3,5-trimethylbenzene (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 71-79 
    Details
    ISSN: 1572-9567
    Keywords: freezing pressure ; high pressure ; isothermal compressibility ; p, V, T data ; self-diffusion ; 1,3,5-trimethylbenzene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mesurements are reported for the melting point of 1,3,5-trimethylbenzene at pressures up to 345 MPa. Self-diffusion coefficients and p, V, T data have been obtained at 298 and 313 K for pressures up to 280 MPa. Isothermal compressibilities have been calculated from the p, V, T results. The freezing pressures at 0.1 MPa correspond to previously reported values for modification III of trimethylbenzene. Equivalent hard-sphere diameters estimated from the melting point and p, V, T data are used to apply the rough hard-spheres theory to the self-diffusion data; the calculations indicate that there is random packing of the particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503225
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 53
    Electronic Resource
    Electronic Resource
    Volume ratios for n-pentane in the temperature range 278–338 K and at pressures up to 280 MPa (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 231-238 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; isothermal compressibility ; n-pentane ; volume ratio
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Volume ratios (V P/V 0.1), and isothermal compressibilities calculated from them, are reported for n-pentane for seven temperatures in the range 278 to 338 K for pressures up to 280 MPa. The isobaric measurements were made with a bellows volumometer for which a novel technique had to be devised to enable measurements to be made above the normal boiling point (309.3 K). The accuracy of the volume ratios is estimated to be ±0.05 to 0.1% up to 303.15 K and ±0.1 to 0.2% from 313.15 to 338.15 K. The volume ratios are in good agreement with those calculated from recent literature data up to the maximum pressure of the latter, viz., 60 MPa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00515205
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 54
    Electronic Resource
    Electronic Resource
    Solid-liquid phase equilibria of benzene + 2-methyl-2-propanol system under high pressures (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 61-71 
    Details
    ISSN: 1572-9567
    Keywords: benzene ; high pressure ; 2-methyl-2-propanol ; solid-liquid phase equilibrium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid-liquid phase equilibria of the benzene + 2-methyl-2-propanol system have been investigated at temperatures from 278 to 323 K and pressures up to 300 MPa using a high-pressure optical vessel. The uncertainties of the measurements of temperature, pressure and composition are within ±0.1 K, ±0.5 MPa, and ±0.001 mole fraction, respectively. The freezing pressure at a constant composition increases monotonously with pressure. The eutectic point shifts to a higher temperature and benzene-rich composition with increasing pressure. In order to describe the pressure-temperature-composition relation of high-pressure solid-liquid phase equilibria, a new simple equation has been proposed as follows: $$In x_i (P,T) = - \frac{1}{{RT}}\{ C(T)[P - B(T)] + D(T)[P^2 - B(T)^2 ]\} $$ where B, C, and D are the temperature-dependent coefficients and are expressed by the polynomials of reciprocal of temperature. It is found that the solid-liquid coexistence curves of both eutectic systems and solid-solution systems can be correlated satisfactorily by this equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00504000
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 55
    Electronic Resource
    Electronic Resource
    Compressibility and sound velocity measurements on N2 up to 1 GPa (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 103-116 
    Details
    ISSN: 1572-9567
    Keywords: adiabatic compressibility ; equation of state ; density ; high pressure ; isothermal compressibility ; nitrogen ; pVT ; sound velocity ; ultrasonics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A gas expansion technique has been used to determine the pVT properties of N2 up to 1 GPa at 298.15 K, with an accuracy of 0.08% in density, 1 mK in temperature, and 0.05%+0.2 MPa in pressure. The sound velocity has been measured by a phase-comparison pulse-echo technique between 123 and 298 K at intervals of 25 K and at pressures up to 1 GPa, with an accuracy of better than 0.02% in sound velocity, 10 mK in temperature, and 0.05%+0.2 MPa in pressure. An equation of state is presented that correlates the density data over the wide pressure range of 36–1000 MPa with maximum deviations between the calculated and the experimental densities of less than 0.05%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00504003
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 56
    Electronic Resource
    Electronic Resource
    Thermal conductivity of liquid halogenated ethanes under high pressures (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 465-479 
    Details
    ISSN: 1572-9567
    Keywords: fluorocarbon ; halogenated ethane ; liquid ; high pressure ; refrigerant ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New experimental data on the thermal conductivity of liquid halogenated ethanes, R112 (CCl2F-CCl2F), R113 (CCl2F-CClF2), R114 (CClF2-CClF2), R114B2 (CBrF2-CBrF2), and R123 (CHCl2-CF3), are presented in the temperature range from 283 to 348 K at pressures up to 200 MPa or the freezing pressures. The measurements were carried out by a transient hot-wire apparatus within an uncertainty of ±1.0%. The thermal conductivity data obtained have been analyzed by means of the corresponding-states principle and other empirical methods. It is found that the corresponding-states correlation λ=f(Tr, Pr) holds well for R112, R113, and R114. The thermal conductivity can also be correlated satisfactorily with temperature, pressure, and molar volume by a similar expression to the Tait equation and the dense hard-sphere model presented by Dymond.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503147
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 57
    Electronic Resource
    Electronic Resource
    Viscosity of aqueous solutions of 1,2-ethanediol and 1,2-propanediol under high pressures (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 511-523 
    Details
    ISSN: 1572-9567
    Keywords: aqueous alcohol solution ; ethanediol ; ethylene glycol ; falling-cylinder viscometer ; free-volume theory ; high pressure ; pressure effect ; propanediol ; propylene glycol ; viscosity ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New experimental data on the viscosity of aqueous solutions of 1,2-ethanediol (ethylene glycol) and 1,2-propanediol (propylene glycol) are presented at 298 and 323 K under pressures up to 120 MPa. The measurements were performed by a falling-cylinder viscometer on a relative basis with an uncertainty of less than ±2%. The viscosity of these aqueous solutions at a constant temperature and pressure increases monotonously with increasing concentrations of diols (glycols) and is slightly lower than the mole fraction average value at each composition. The viscosity also increases almost linearly with pressure at a constant temperature and composition. The pressure coefficient of the viscosity, (∂η/∂P)T,x, increases with decreasing temperature and increasing concentrations of diols. The experimental results are correlated with pressure, density, and composition by several empirical equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503150
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 58
    Electronic Resource
    Electronic Resource
    Isochoric (p, v, T) measurements on CO2 and (0.98 CO2+0.02 CH4) from 225 to 400 K and pressures to 35 MPa (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 547-557 
    Details
    ISSN: 1572-9567
    Keywords: carbon dioxide ; density ; high pressure ; isochoric ; mixtures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Comprehensive isochoric (p, v, T) measurements have been obtained for (0.98 CO2+0.02 CH4) at densities from 1 to 26mol·dm−3. Supplemental isochoric (p, v, T) measurements have been obtained for high-purity CO2 at densities from 12 to 24 mol·dm−3. Measurements of p(T) cover a broad range of temperature, 225 to 400 K, at pressures to 35 MPa. Comparisons have been made with independent sources and with a predictive method based on corresponding states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503153
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 59
    Electronic Resource
    Electronic Resource
    The Tait equation: 100 years on (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 941-951 
    Details
    ISSN: 1572-9567
    Keywords: density ; high pressure ; Tait equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The “Tait equation,” which is now widely used to fit liquid density data over wide pressure ranges, is a modification of the original equation of Tait, published 100 years ago, to fit his results on the compressibility of fresh water and seawater at different pressures. The range of applicability of these different equations is discussed and it is concluded that their simplicity and accuracy in reproducing high pressure density data for dense gases, liquids, solids, and liquid mixtures will ensure their continued use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01133262
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 60
    Electronic Resource
    Electronic Resource
    Viscosity and Density at High Pressures in an Associative Ternary (1998)
    Springer
    International journal of thermophysics 19 (1998), S. 1325-1341 
    Details
    ISSN: 1572-9567
    Keywords: density ; excess activation energy of viscous flow ; high pressure ; ternary mixture ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The dynamic viscosity η and the density ρ of the associative ternary mixture water+diacetone alcohol+2-propanol have been measured as a function of temperature T (303.15, 323.15, and 343.15 K) and pressure P (≤100 MPa). The experimental results correspond to 698 values of η and ρ. With reference to the 54 values previously published on pure substances and 486 values for three corresponding binaries, the system is globally described by 1188 experimental values for various values of P, T and composition. The results for η are discussed in terms of excess activation energy of viscous flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021975300772
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 61
    Electronic Resource
    Electronic Resource
    Relative Permittivity and Resistivity of Liquid HFC Refrigerants Under High Pressure (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 107-117 
    Details
    ISSN: 1572-9567
    Keywords: dielectric constant ; electrical resistivity ; HFC-236ea ; HFC-245fa ; hydrofluorocarbon ; permittivity ; high pressure ; refrigerants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The static relative permittivity (dielectric constant) and the resistivity of HFC-236ea (CF3–CHF–CHF2) and HFC-245fa (CF3–CH2–CHF2) in the liquid phase were studied at temperatures from 293 to 343 K and pressures from 0.1 to 50 MPa. The relative permittivity was measured by a concentric-cylinder-type capacitance cell with an LCR meter with an uncertainty of less than 0.1%. The resistivity was measured by a high resistance meter using plane-parallel platinum electrodes installed in a borosilicate glass syringe. It was found that the relative permittivities and the resistivities of liquid HFC-236ea and HFC-245fa at 303 K and 0.101325 MPa are about 5.13 and 6.54 and 1.5×1010 and 0.2×1010 Ω·cm, respectively. The relative permittivity and the resistivity increase monotonically with increasing pressure and decreasing temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021430214264
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 62
    Electronic Resource
    Electronic Resource
    Thermal Conductivity Measurements of Aqueous SrCl2 and Sr(NO3)2 Solutions in the Temperature Range Between 293 and 473 K at Pressures up to 100 MPa (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 187-196 
    Details
    ISSN: 1572-9567
    Keywords: aqueous solutions ; density ; high pressure ; parallel-plate method ; salt ; thermal conductivity ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Accurate high-pressure thermal conductivity measurements have been performed on H2O+SrCl2 and H2O+Sr(NO3)2 mixtures at pressures up to 100 MPa over a temperature range between 293 and 473 K using a parallel-plate apparatus. The concentrations studied were 0.025, 0.05, 0.10, 0.15, and 0.20 mass fraction of the salts. The estimated accuracy of the method is about ±1.6%. The pressure, temperature, and concentration dependences of the thermal conductivity have been studied. Measurements were made on six isobars, namely, 0.1, 20, 40, 60, 80, and 100 MPa. The thermal conductivity shows a linear dependence on pressure and concentration for all isotherms. Along each isobar, a given concentration shows the thermal-conductivity maximum at a temperature of about 413 K. The measured values of thermal conductivity at atmospheric pressure are compared with the results of other investigators. Literature data at atmospheric pressure reported by Ridel and by Zaitzev and Aseev agree with our thermal conductivity values within the estimated uncertainty.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021494601060
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 63
    Electronic Resource
    Electronic Resource
    Velocity of sound in supercritical water up to 700°C and 300 MPa (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 1065-1075 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; high temperature ; velocity of sound ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The velocity of sound in water was measured up to 700°C and 300 MPa. A classical pulse method has been used. The frequency was typically 5 MHz. The mean accuracy of the data is 0.5% of the velocity. The greatest error in velocity is due to the uncertainty in the temperature measurements at high pressures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00502378
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 64
    Electronic Resource
    Electronic Resource
    PVT and derived thermodynamic properties for the glycine-water system at temperatures from 298 to 323 K and pressures up to 300 MPa (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 35-45 
    Details
    ISSN: 1572-9567
    Keywords: glycine ; high pressure ; PVT relation ; Tait equation ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The specific volumes for the glycine-water system have been measured in the temperature range 298–323 K and at pressures up to 300 MPa, using a glass piezometer. The uncertainties in the specific volume are estimated to be less than 0.03%. The PVT relations are correlated by the Tait equation. Good agreement was found with correlations by the Tait equation using a simple extension similar to that proposed by Dymond and Malhotra. The isothermal compressibility and apparent molar volume of glycine are calculated by the Tait equation. The apparent molar volume of glycine increases with increasing pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500706
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 65
    Electronic Resource
    Electronic Resource
    A vibrating-rod densimeter (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 871-883 
    Details
    ISSN: 1572-9567
    Keywords: densimeter ; density ; high pressure ; n-heptane ; vibrating wire
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements are reported that confirm the applicability of the theory of a vibrating-rod densimeter to a practical instrument. It is demonstrated that with such a device, liquid density measurements evaluated on an absolute basis can be made with an accuracy of ±0.2% at pressures up to 100 MPa. When the density of the liquid is evaluated on a relative basis, a precision of ±0.1% can be achieved over the same range of pressure. Future developments of the instrument that would greatly enhance its sensitivity and that rely upon the availability of a proven theory are therefore now possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00514482
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 66
    Electronic Resource
    Electronic Resource
    The phase diagram of the solid methanes (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 1205-1212 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; isotope effects ; methane (solid) ; nuclear magnetic resonance ; phase diagrams
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A comparative study is presented of the phase diagrams of the solid methanes CH4, CH3D, CH2D2, CHD3, and CD4 obtained experimentally using NMR techniques at pressures up to 9 kbar. Polynomial representations of the I–II, I–III and II–III phase transition lines are given. The experimental conditions under which solid methane transforms to phase IV are discussed and polynomial representations of the I–IV, the IV–I, and the IV–II transition lines are also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500571
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 67
    Electronic Resource
    Electronic Resource
    The PVT behavior of liquid 1,1,1- and 1,1,2-trichloroethane (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 1229-1234 
    Details
    ISSN: 1572-9567
    Keywords: liquid volume ; high pressure ; PVT ; 1,1,1-trichloroethane ; 1,1,2-trichloroethane ; Tait equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The PVT behavior of liquid 1,1,1- and 1,1,2-C2H3Cl3 has been determined at 298.15, 323.15, 348.15, 373.15, and 398.15 K and at different pressures to about 100 MPa. The experimental results are shown in tabulated form. Specific volumes at high pressures are represented by the Tait equation. These results are also compared with the results obtained by a generalized Tait equation and other correlation methods. The generalized Tait equation is found to be more suitable to explain this study than the other correlations tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500574
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 68
    Electronic Resource
    Electronic Resource
    Ultrasonic speed in mixtures of monochlorodifluoromethane and monochloropentafluoroethane under high pressures (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 661-671 
    Details
    ISSN: 1572-9567
    Keywords: binary mixture ; critical region ; high pressure ; R22 ; R502 ; R115 ; refrigerants ; ultrasonics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ultrasonic speed u of [(1 -ϰ) CHClF2(1) + ϰC2ClF5(1)] including the azeotropic mixture [CHClF2(1) + C2ClF5(1)] was measured at pressures up to 51 MPa within the temperature range 283.15 to 373.15 K, using a sing-around technique operated at a frequency of 2 MHz with an estimated uncertainty of less that ±2.4 m·s−1. For ϰ = 0.1537 and 0.6268, measurements of the vapor pressure are also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00507987
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 69
    Electronic Resource
    Electronic Resource
    Broadening of the vibrational linewidth in a mixture due to critical concentration fluctuations (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 585-598 
    Details
    ISSN: 1572-9567
    Keywords: concentration fluctuations ; critical broadening ; high pressure ; line shape ; line shift ; local composition ; mixtures ; nitrogen-helium ; Raman spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Vibrational Raman spectroscopy is a very usful technique for studying the dynamical behavior of a system, in particular in the critical region. In a mixture, composition fluctuations play an important role and on the basis of the results for pure substances one would expect an increase of the linewidth in approaching the critical point. However, in previous experiments such an effect was not detected. The reasons for this failure will be discussed. Recently, we have observed a considerable broadening of the linewidth in approaching the critical point in the system helium-nitrogen under high pressure. However, it is well-known that broadening may occur through various other mechanisms such as changes in density, composition fluctuations far from the critical point, aggregation, etc. On the basis of the helium-nitrogen data the pitfalls in the experimental determination of critical broadening are discussed. The data analysis takes into account the contribution of noncritical effects. Consequences are drawn for the interpretation of spectroscopic data in terms of concentration of species in supercritical solvents. Moreover, we discuss the possibility of a difference between the local composition and the bulk composition and demonstrate from our line shift data that this is not a critical effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438844
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 70
    Electronic Resource
    Electronic Resource
    Vibrational Spectra of Nitrogen in Simple Mixtures at High Pressures (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 867-876 
    Details
    ISSN: 1572-9567
    Keywords: dilute mixtures ; high pressure ; high-resolution Raman spectroscopy ; line width ; nitrogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Previous investigations have revealed a considerable difference between the spectral behavior of a molecule in a pure substance and that in a mixture. To gain more insight into the influence of the intermolecular interaction and of the mass of the molecules, we performed high-resolution measurements of the linewidths and peak positions of the vibrational Raman spectrum of pure nitrogen, nitrogen in argon, and nitrogen in helium. The research was carried out at room temperature and at pressures up to the melting line. It turns out that, in contrast with expectation, the linewidth as well as the frequency shift is essentially the same for pure nitrogen as for nitrogen diluted in argon, although both the mass and the potential well depth are quite different. The experimental results show the same tendency as recent computer simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022635203155
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 71
    Electronic Resource
    Electronic Resource
    Determination of the Critical Point of Gold (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 1289-1297 
    Details
    ISSN: 1572-9567
    Keywords: critical point ; electrical resistivity ; enthalpy ; gold ; high pressure ; high temperature ; liquid metals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Wire-shaped gold specimens are placed in a new, improved high-pressure vessel, which is part of a fast capacitor-discharge circuit and in which static pressures above 600 MPa can be reached with distilled water as the pressure-transmitting medium. The specimens are self-heated resistively by a current pulse. The current through the specimen, the voltage drop across it, and its temperature are recorded as a function of time with submicrosecond resolution. The radial expansion of the specimen is determined with a CCD camera, Experiments are performed at different pressures. When the critical pressure is exceeded, there is no liquid–gas phase transition; hence, no sudden change in the thermal expansion rate is observed. The results for temperature, pressure, and specific volume at the critical point of gold are as follows: T c =7400±1100 K, p c=530±20 MPa, and v c=0.13±0.03 × 10−3m3·kg−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022687811410
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 72
    Electronic Resource
    Electronic Resource
    Measurements of the Thermal Conductivity of HFC-134a in the Temperature Range from 300 to 530 K and at Pressures up to 50 MPa (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 1379-1401 
    Details
    ISSN: 1572-9567
    Keywords: coaxial cylinders ; HFC-134a ; high pressure ; high temperature ; refrigerant ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the thermal conductivity of HFC-134a made in a coaxial cylinder cell operating in steady state are reported. The measurements of the thermal conductivity of HFC-134a were performed along several quasi-isotherms between 300 and 530 K in the gas phase and the liquid phase. The pressure ranged from 0.1 to 50 MPa. Based on the experimental data, a background equation is provided to calculate the thermal conductivity outside the critical region as a function of temperature and pressure. A careful analysis of the various sources of errors leads to an estimated uncertainty of ±1.5%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021480803361
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 73
    Electronic Resource
    Electronic Resource
    Viscosity of Alcohol–Ethene Mixtures at Pressures up to 195 MPa (1998)
    Springer
    International journal of thermophysics 19 (1998), S. 43-69 
    Details
    ISSN: 1572-9567
    Keywords: alcohols ; density ; ethene ; high pressure ; hydrogen bond ; mixtures ; vinyl acetate ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Viscosities of several alcohol–ethene and vinyl acetate–ethene mixtures were measured with a rolling-ball viscometer. The viscosity measurements were performed at temperatures from 298 to 413 K and pressures up to 195 MPa with an estimated uncertainty of ±2%. The appearance of hydrogen bonds forming alcohol associates has a notable effect on the viscosity of alcohol–ethene mixtures above an alcohol mole fraction of about 0.2. This could be noticed from the deviation of the viscosity from the Arrhenius law, which occurs when alcohol associates are formed. An effect of pressure on the association of alcohol molecules through hydrogen bonding was not observable from the viscosity data. A new method for the description of the temperature- and pressure-dependent parameters in the McAllister and Dizechi models is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021494917841
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 74
    Electronic Resource
    Electronic Resource
    Specific heat capacity of solids under pressure from measurements of (∂T/∂P)s (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 101-105 
    Details
    ISSN: 1572-9567
    Keywords: adiabatic compression ; calculational procedure ; high pressure ; specific heat capacity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A procedure is described for calculating specific heat capacity under pressure, c p (T, P), from data for c p (T, 0) and adiabatic (∂T/∂P) s. The main advantage is that (∂T/∂P)s can be readily measured under high-pressure conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00505794
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 75
    Electronic Resource
    Electronic Resource
    Thermal conductivity of methane for temperatures between 110 and 310 K with pressures to 70 MPa (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 119-142 
    Details
    ISSN: 1572-9567
    Keywords: density ; high pressure ; hot wire ; methane ; thermal conductivity ; transient measurements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper presents new experimental measurements of the thermal conductivity of methane for 14 temperatures between 110 and 310 K with pressures to 70 MPa and densities from 0 to 30 mol · L−1. The measurements were made with a transient hot-wire apparatus and they cover a wide range of physical states including the dilute gas, the moderately dense gas, the near-critical region, the compressed liquid states, and the vapor at temperatures below the critical temperature. The new measurements are closely spaced in temperature and density to describe the thermal conductivity surface, in particular the critical enhancement which extends to the highest temperature measured. A fit of the thermal conductivity surface allows comparison of the present results to those of others. The comparison reveals several discrepancies inherent in the results of others and in an earlier correlation. The precision (2σ) of the methane measurements is between 0.5 on 0.8 % for wire temperature transients of 4 to 5 K, while the accuracy is estimated to be 1.6%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500027
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 76
    Electronic Resource
    Electronic Resource
    A simple differential thermal analysis technique for determining the pressure dependence of solid-liquid and solid-solid transition temperatures (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 275-284 
    Details
    ISSN: 1572-9567
    Keywords: acetonitrile ; benzene ; carbon tetrachloride ; differential thermal analysis ; high pressure ; phase transition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A simple differential thermal analysis technique for determining solid-liquid and solid-solid transition temperatures as functions of pressure is described. The important feature of the technique is the use of a thin-walled ptfe tube both to contain the sample and to transmit pressure to it. The method has been tested at temperatures in the range 200–310 K at pressures of up to 350 MPa. Transition temperatures as functions of pressure are reported for benzene, carbon tetrachloride, and acetonitrile and compared with literature data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00522149
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 77
    Electronic Resource
    Electronic Resource
    Hydrogen component fugacities in binary mixtures with carbon dioxide: Pressure dependence (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 205-216 
    Details
    ISSN: 1572-9567
    Keywords: carbon dioxide ; fugacity ; high pressure ; hydrogen ; hydrogen + carbon dioxide binary system ; mixtures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The fugacity coefficients of hydrogen in binary mixtures with carbon dioxide were measured isothermally using a physical equilibrium technique. This technique involves the use of an experimental chamber which is divided into two regions by a semipermeable membrane. Hydrogen can penetrate and pass through the membrane, while carbon dioxide cannot. During the approach to equilibrium, the pressure of pure hydrogen on one side of the membrane approaches the partial pressure of hydrogen in the mixture on the other side of the membrane. This allows a direct measurement of the hydrogen component fugacity at a given mixture mole fraction. In this study, results are reported for measurements made on the hydrogen + carbon dioxide binary at 130°C (403 K), with total mixture pressure of 3.45, 5.17, 8.62, 10.34, and 13.79 MPa. General trends in the experimental results are discussed, and comparisons are made with predictions from the Redlich-Kwong, Peng-Robinson, and extended corresponding-states models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00515203
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 78
    Electronic Resource
    Electronic Resource
    Measurement of the compressibility and sound velocity of neon up to 1 GPa (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 803-812 
    Details
    ISSN: 1572-9567
    Keywords: compressibility ; equation of state ; high pressure ; neon ; pVT ; sound velocity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The density of neon has been determined at 298.15 K as a function of pressure from 80 MPa to 1 GPa. The precision of the measurements is 0.03%, while the estimated absolute accuracy is between 0.05 and 0.09%. The sound velocity has been measured between 98 and 298 K with intervals of 25 K and at pressures up to 1 GPa, with an accuracy generally better than 0.06%. The adiabatic compressibility and the ratio of the specific heats are calculated by combining pVT with velocity-of-sound data at 298 K. Several equations of state are fitted to the density data at 298.15 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503246
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 79
    Electronic Resource
    Electronic Resource
    An automated flow calorimeter for heat capacity and enthalpy measurements (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 993-1002 
    Details
    ISSN: 1572-9567
    Keywords: calorimetry ; flow calorimeter ; heat capacity (isobaric) ; high pressure ; high temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An automated flow calorimeter has been developed for the measurement of heat capacity and latent enthalpies of fluids at elevated temperatures (300–700 K) and pressure (〈30M Pa) with a design accuracy of 0.1%. The method of measurement is the traditional electrical power input flow calorimeter, utilizing a precision metering pump, which eliminates the need for flow-rate monitoring. The calorimeter cell uses a unique concentric coil design with passive metal radiation shields and active guard heaters to minimize heat leakage, eliminate the traditional constant-temperature bath, and facilitate easy component replacement. An additional feature of the instrument is a complete automation system, greatly simplifying operation of the apparatus. A novel multitasking software scheme allows a single microcomputer simultaneously to control all system temperatures, provide continuous monitoring and updates on system status, and log data. Preliminary results for liquid water mean heat capacities show the equipment to be performing satisfactorily, with data accuracies of better than ±0.3%. Minor equipment modifications and better thermometry are required to reduce systemic errors and to achieve the designed operational range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01133267
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 80
    Electronic Resource
    Electronic Resource
    The thermal conductivity of talc as a function of pressure and temperature (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 1111-1120 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; hot-wire method ; talc ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Talc is a commonly used pressure-transmitting and gasket material for high-temperature and -pressure applications. The thermal conductivity of talc at high pressures and temperatures is therefore valuable in the design of high-pressure experiments and apparatus. In this paper measurements of the thermal conductivity of fired and unfired talc are presented. Measurements were made at pressures ranging from 0 to 2.5 GPa and temperatures from 150 to 900 K. The thermal conductivity was measured with the hotwire technique. The thermal conductivity results for both the fired and the unfired talc show a slight increase with increasing pressure. The absolute value of the thermal conductivity of talc is lower in the fired material than in the unfired material. In both cases, the thermal conductivity varied less than 15% over the temperature range studied. X-Ray diffraction studies have shown talc to be highly disordered. The results are shown to be consistent with those expected for a disordered crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01133278
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 81
    Electronic Resource
    Electronic Resource
    Thermal conductivity of liquids: Prediction based on a group-contribution scheme (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 779-791 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; liquids ; prediction ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new semiempirical predictive scheme for the thermal conductivity of liquids, based on an extension of concepts derived from the rigid-sphere model of dense-fluid transport properties, is presented. The scheme makes use of the idea of group contributions to the molecular volume and is developed with the aid of accurate thermal conductivity data for the alkanes, the aromatic hydrocarbons, the alcohols, and the diols, along the saturation line and at elevated pressures. The procedure has been tested against other thermal conductivity data, not included in its formulation, and has been found to predict values within ±4% of the experimental data in the temperature range 110–370 K for pressures up to 600 MPa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00514475
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 82
    Electronic Resource
    Electronic Resource
    Viscosities of six 1-Alkanols at temperatures in the range 298–348 K and pressures up to 200 MPa (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 833-843 
    Details
    ISSN: 1572-9567
    Keywords: decanol ; dodecanol ; falling-body viscometer ; free volume ; hexadecanol ; hexanol ; high pressure ; octanol ; significant structure theory ; tetradecanol ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Viscosities of six higher 1-alkanols (1-hexanol, 1-octanol, 1-decanol, 1-dodecanol, 1-tetradecanol, and 1-hexadecanol) have been determined at temperatures from 298 to 348 K and pressures up to 200 MPa. The viscosity measurements were performed using a falling-body viscometer with an uncertainty of ±5%. Simple equations are presented to express the experimental viscosities as a function of temperature and pressure within the experimental uncertainty. The relationship between the viscosity and the density of these alkanols is discussed in terms of the significant structure theory extended to high pressures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00514479
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 83
    Electronic Resource
    Electronic Resource
    Volumetric properties of 1-alkanols at temperatures in the range 298–348 K and pressures up to 40 MPa (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 885-897 
    Details
    ISSN: 1572-9567
    Keywords: decanol ; density ; dodecanol ; hexadecanol ; hexanol ; high pressure ; isothermal compressibility ; octanol ; Tait equation ; tetradecanol ; thermal expansion coefficient
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Molar volumes, thermal expansion coefficients, and isothermal compressibilities of six higher 1-alkanols (1-hexanol, 1-octanol, 1-decanol, 1-dodecanol, 1-tetradecanol, and 1-hexadecanol) have been determined at temperatures from 298 to 348 K and pressures up to 40 MPa. The density measurements were performed using a vibrating densitometer with an uncertainty of ±0.06%. The relationship between the properties and the structures of these alkanols is discussed in terms of the carbon-chain lengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00514483
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 84
    Electronic Resource
    Electronic Resource
    Monte Carlo calculations on the beta-delta phase transition in nitrogen with a generalized free energy method (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 957-963 
    Details
    ISSN: 1572-9567
    Keywords: Gibbs free energy ; high pressure ; Monte Carlo ; nitrogen ; phase transition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Monte Carlo simulations that utilize an (N, P, T) ensemble with periodic deformable boundary conditions cannot describe phase transitions properly when a large potential barrier is involved. An alternative method is to calculate the Gibbs free energy difference between phases; the transition occurs when the difference is equal to zero. The Gibbs free-energy difference can be calculated using a generalized free-energy method. This method is used to determine theβ-δ phase transition of solid nitrogen at room temperature. The Gibbs freeenergy difference between theβ and theδ phase was obtained at 4.0 GPa. The difference at other pressures could be determined with the equation of state. The transition pressure was found at about 6.2 GPa, 1.3 GPa above the experimental pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02093475
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 85
    Electronic Resource
    Electronic Resource
    The viscosity of liquid carbon dioxide (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 145-153 
    Details
    ISSN: 1572-9567
    Keywords: carbon dioxide ; high pressure ; low temperature ; liquid ; viscosity coellicient
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The viscosity coellicient of carbon dioxide in the liquid phase has been measured by means of a vibrating-wire viscometer at temperatures of 220, 230, 240, 2411, 260, and 380 K. The measurements extended beyond both phase transition lines into the coexistence region (superheated liquid) and into the solid range (undercooled liquid). At 3811 K. the measurements extended only to 3511 MPa since no density data are available for high pressures. The accuracy of the measurements is estimated to be I % The agreement with the data of Ulybin and Makarushkin is rather good, but our values are in general a few percent lower than those of Diller and Ball. The results show, for the most part, a linear pressure dependence for the various isotherms, with a common intersection with the negative pressure axis of 113.7 MPa. The fluidity, the reciprocal of the viscosity, shows a linear dependence of the molar volume in adjacent density ranges. After reduction of the molar volume with the volumes of close packing, two sets of linear functions result, with common intersections of the axis forV/V 0=1.31 andV/V 0=1.40.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438965
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 86
    Electronic Resource
    Electronic Resource
    The viscosity of liquid toluene at elevated pressures (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 877-882 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; toluene ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper reports new measurements on the viscosity of toluene at pressures up to 500 MPa at 299 K and pressures up to 435 MPa at 323 K. The results are in close agreement with recent viscosity measurements from a vibrating-wire viscometer at pressures up to 250 MPa but confirm earlier measurements from a falling-body viscometer which show that the recently recommended polynomial expression for the representation of the pressure dependence of the viscosity of toluene up to 250 MPa underestimates the viscosity if applied at 500 MPa by about 30%. Modification of this polynomial expression by inclusion of one additional term is found to represent the data satisfactorily over the whole pressure range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02093470
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 87
    Electronic Resource
    Electronic Resource
    Critical evaluation of the thermodynamic properties of molybdenum (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 367-393 
    Details
    ISSN: 1572-9567
    Keywords: enthalpy ; equation of state ; heat capacity ; high pressure ; high temperature ; molybdenum ; thermodynamic properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermodynamic properties and the pressure-temperature phase diagram of pure Mo have been evaluated from experimental information using thermodynamic models for the Gibbs energy of the individual phases. A set of parameters describing the Gibbs energy of the various phases as a function of temperature and pressure is presented. The agreement between experimental data and calculated values is satisfactory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500269
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 88
    Electronic Resource
    Electronic Resource
    Thermal conductivity of methane-ethane mixtures at temperatures between 140 and 330 K and at pressures up to 70 MPa (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 607-617 
    Details
    ISSN: 1572-9567
    Keywords: enhancement ; ethane ; high pressure ; methane ; mixtures ; thermal conductivity ; transient hot-wire apparatus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper presents new measurements on the thermal conductivity of three methane-ethane mixtures with methane mole fractions of 0.69, 0.50, and 0.35. The thermal conductivity surface for each mixture is defined by up to 13 isotherms at temperatures between 140 and 330 K with pressures up to 70 MPa and densities up to 25 mol · L−1. The measurements were made with a transient hot-wire apparatus. They cover a wide range of physical states including the dilute gas, the single-phase fluid at temperatures above the maxcondentherm, the compressed liquid states, and the vapor at temperatures below the maxcondentherm. The results show an enhancement in the thermal conductivity in the single-phase fluid down to the maxcondentherm temperature, as well as in the vapor and in the compressed liquid. A curve fit of the thermal conductivity surface is developed separately for each mixture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500333
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 89
    Electronic Resource
    Electronic Resource
    Ultrasonic speeds and densities of poly(dimethylsiloxane) (viscosity grades 30 and 50×10−4 m · s−1) at 298.15, 303.15, and 308.15 K under high pressures (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 451-463 
    Details
    ISSN: 1572-9567
    Keywords: bellows piezometer ; density ; high pressure ; poly(dimethylsiloxane) ; sing-around technique ; ultrasonic speed
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ultrasonic speeds and densities of poly(dimethylsiloxane), viscosity grades 30 and 50×10−4 m · s−1 at 298.15 K, were measured at 298.15, 303.15, and 308.15 K. The measurements were carried out using new apparatuses, one for measurement of the speed under pressures up to 200 MPa and another for measurement of the density under pressures up to 100 MPa. The former is constructed with a sing-around technique of the fixed-path type operated at a frequency of 2 MHz, and the latter is a dynamic bellows piezometer. The probable uncertainty in the present results is within ±0.23% for speed and ±0.19% for density for all the experimental conditions. The ultrasonic speed in these fluids at first increases rapidly with pressure and then indicates a mild rise in the highpressure region. Similar pressure effects are observed for the density. The relationship between the speed and the density satisfied a first-order function well. The isentropic compressibility, derived from the speed and density, also showed a large pressure effect. The values and its pressure effects seemed almost independent of the viscosity of poly(dimethylsiloxane).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00508890
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 90
    Electronic Resource
    Electronic Resource
    Sound speed in liquid lead at high temperatures (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 161-165 
    Details
    ISSN: 1572-9567
    Keywords: dynamic technique ; high pressure ; high temperature ; lead ; sound speed ; thermophysical properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A dynamic technique, the isobaric expansion experiment (IEX), is used to reach high-temperature and pressure states in liquid lead. A unique technique is described for making sound-speed measurements once a final equilibrium end state is obtained. Data over an extended density range are presented. The sound speed in liquid lead over this range appears to vary linearly with density and has no dependence on temperature within our experimental precision (±7 %).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503807
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 91
    Electronic Resource
    Electronic Resource
    Thermal conductivity and heat capacity of liquid toluene at temperatures between 255 and 400 K and at pressures up to 1000 MPa (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 1147-1161 
    Details
    ISSN: 1572-9567
    Keywords: ac-heated wire method ; heat capacity ; high pressure ; thermal conductivity ; toluene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivity λ and heat capacity c p of liquid toluene have been measured by the ac-heated wire method up to 1000 MPa in the temperature range from 255 to 400 K. The total error of thermal conductivity measurements is estimated to be about 1 %, and the precision 0.3 %. The heat capacity per unit volume, pc p, obtained directly from the experiment is uncertain within 2 or 3%. The λ vs p isotherms are found to cross one another at approximately 700 MPa. The minima in the pressure (or volume) dependence of cp of toluene are evident at all temperatures investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503972
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 92
    Electronic Resource
    Electronic Resource
    Volumetric behavior of pure alcohols and their water mixtures under high pressure (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 47-70 
    Details
    ISSN: 1572-9567
    Keywords: alcohols ; aqueous mixtures ; butanols ; compressibility ; ethanol ; excess volume ; high pressure ; methanol ; propanols ; specific volume ; Tait equation ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The specific volumes of C1-C4 alcohols and binary mixtures of water with methanol, ethanol, 1-propanol, 2-propanol, and 2-methyl-2-propanol are presented as functions of temperature, pressure, and composition. The measurements were carried out using a modified Adams piezometer and a high-pressure burette method in a temperature range from 283.15 to 348.15 K at pressures up to 350 MPa. The uncertainties in the specific volume obtained are estimated to be less than 0.09%. The specific volumes of the pure alcohols and their mixtures with water are found to decrease monotonously with increasing pressure. The numerical P-V relations at each temperature and composition are correlated satisfactorily as a function of pressure by the Tait equation. Definite inflections appear on the isobars of isothermal compressibility or partial molar volume versus composition of alcohol + water mixtures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503224
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 93
    Electronic Resource
    Electronic Resource
    Densities of n-alkanes and their mixtures at elevated pressures (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 541-555 
    Details
    ISSN: 1572-9567
    Keywords: alkanes ; density ; high pressure ; liquid mixtures ; Tait equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Accurate density data for n-alkanes over a wide range of temperature and pressure have been used to test existing correlation and prediction methods. It is found that the most successful representation at temperatures up to 0.66 times the critical temperature and pressures up to 150 MPa is given by the Tait equation in the form (ρ−ρ0)/ρ=C log [(B + P)/(B + P 0)], where subscript 0 refers to 0.101 MPa, with C equal to 0.2000, and [B+(C n −6)], where C n is the number of carbon atoms in the alkane chain, is a smooth function of reduced temperature. A simple extension of this method to mixtures gives an excellent prediction of densities at pressures up to 150 MPa over the same reduced temperature range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503641
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 94
    Electronic Resource
    Electronic Resource
    Measurements of the thermal conductivity of aqueous LiBr solutions at pressures up to 40 MPa (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 317-329 
    Details
    ISSN: 1572-9567
    Keywords: aqueous solutions ; high pressure ; lithium bromide ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper describes absolute measurements of the thermal conductivity of aqueous LiBr solutions in the concentration range 5 to 15m (molality), the temperature range 30 to 100°C, and the pressure range 0.1 to 40 MPa. The measurements have been performed with the aid of a transient hot-wire apparatus employing a thin tantalum wire coated with an anodic tantalum pentoxide insulation layer. In using the tantalum wire, a modification of the bridge circuit has been made to keep the electric potential of the wire always higher than the ground level in order to protect the insulation layer from breakdown. The experimental data, which have an estimated accuracy of ±0.5%, have been correlated in terms of the polynomials of concentration, temperature, and pressure for practical use. Also, it has been found that the pressure coefficient of the thermal conductivity decreases with increasing concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00513074
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 95
    Electronic Resource
    Electronic Resource
    Measurement of the compressibility and sound velocity of helium up to 1 GPa (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 425-438 
    Details
    ISSN: 1572-9567
    Keywords: adiabatic compressibility ; equation of state ; density ; high pressure ; isothermal compressibility ; helium ; pVT ; sound velocity ; ultrasonics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By using a gas expansion technique, the density of helium has been determined at 298.15 K as a function of pressure from 100 MPa to 1 GPa. The precision of the measurements is 0.02%, while the estimated absolute accuracy is about 0.08%. The sound velocity has been measured by a phase-comparison pulseecho technique between 98 and 298 K with intervals of 25 K and at pressures up to 1 GPa, with an accuracy generally better than 0.04%. By combining pVT with velocity-of-sound data at 298 K, the adiabatic compressibility and the ratio of the specific heats are calculated. The experimental sound velocities are compared with the values, predicted from an equation of state as proposed by Hansen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00513081
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 96
    Electronic Resource
    Electronic Resource
    The thermal conductivity of ethylene and ethane (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 481-500 
    Details
    ISSN: 1572-9567
    Keywords: Ethane ; ethylene ; high pressure ; thermal conductivity ; transport properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The results of new, absolute measurements of the thermal conductivity of ethylene and ethane are reported. The measurements extend over the temperature range 308 to 425 K and for pressures up to 10 MPa and their accuracy is estimated to be ±0.3% under most conditions, although it deteriorates to ±2% at the lowest temperature and highest pressure near critical conditions. In the limit of zero density the data are employed to determine the diffusion coefficient for internal energy in the gases with the aid of independent measurements of other properties. It is found that vibrational energy transport must occur at a faster rate than diffusion of the molecules themselves, in contrast to the behavior usually observed for rotational energy. At elevated densities the concept of a temperature-independent excess thermal conductivity is found to fail at the highest level of accuracy owing to the proximity of the temperature range studied to the critical point. Nevertheless, the concept remains a useful predictive tool of modest accuracy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503148
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 97
    Electronic Resource
    Electronic Resource
    Thermal conductivity and Lorenz function of zinc under pressure (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 577-585 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; Lorenz number ; pressure dependence ; thermal conductivity ; thermal diffusivity ; thermoelectric power ; zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivity λ and the Lorenz function L of polycrystalline zinc have been calculated from measured values of the thermal diffusivity a and the electrical resistivity γ as functions of pressure P up to 2 GPa at room temperature. The effects of convection in, and freezing of, the pressure transmitting medium are discussed. Both λ and L increase with increasing P, with pressure coefficients of 8.7×10−2 and 1.5×10−2 GPa−1, respectively. The volume dependence of L is found to be similar to that found for other simple metals. Data are also given for the Seebeck coefficient S as a function of P and for a(T) and λ(T) between 55 and 300 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503156
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 98
    Electronic Resource
    Electronic Resource
    Effect of pressure on the solid-liquid phase equilibria of (carbon tetrachloride + p-xylene) and (carbon tetrachloride+benzene) systems (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 535-545 
    Details
    ISSN: 1572-9567
    Keywords: benzene ; carbon tetrachloride ; high pressure ; intermolecular compound ; p-xylene ; solid-liquid phase equilibria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid-liquid phase equilibria of the carbon tetrachloride + p-xylene and the carbon tetrachloride+benzene systems have been investigated at temperatures from 278 to 323 K and pressures up to 500 MPa using a high-pressure optical vessel. The uncertainties in the measurements of temperature, pressure, and composition are within ±0.1 K, ±0.5 MPa, and ±0.001 mole fraction, respectively. In the former system, which has an intermolecular compound with a congruent melting point, the freezing temperature at a constant composition increases monotonously with increasing pressure. The two eutectic points of this system shift to higher temperatures and richer compositions of the compound with increasing pressure. In the latter system, which has two intermolecular compounds with incongruent melting points, the one compound disappears under the present experimental conditions and the incongruent melting point of the other compound changes to the congruent melting point under high pressures. The solid-liquid coexistence curves of these systems can be correlated satisfactorily by the equation previously proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503152
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 99
    Electronic Resource
    Electronic Resource
    Shear viscosity coefficients of compressed gaseous and liquid carbon dioxide at temperatures between 220 and 320 K and at pressures to 30 MPa (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 619-629 
    Details
    ISSN: 1572-9567
    Keywords: carbon dioxide ; density ; high pressure ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The shear viscosity coefficients of compressed gaseous and liquid carbon dioxide hav been measured with the torsional piezoelectric crystal method at temperatures between 220 and 320 K and at pressures to 30 MPa. The dependencies of the viscosity on pressure, density, and temperature and the dependencies of the fluidity (inverse viscosity) on molar volume and temperature have been examined. The measurements on the compressed liquid were correlated with a modified Hildebrand equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500334
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 100
    Electronic Resource
    Electronic Resource
    High-pressure, high-temperature thermophysical measurements on tantalum and tungsten (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 167-179 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; high temperature ; liquid metals ; pulse method ; tantalum ; tungsten
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A submillisecond resistive heating technique under high pressure (0.2 GPa) has been applied to the measurement of thermophysical properties of tantalum and tungsten metals in the solid and the liquid state. Agreement between previously published and most of the present results is good.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503808
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...