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  • 1
    Electronic Resource
    Electronic Resource
    Virial coefficients of methane-ethane mixtures in the temperature range from 0 to 60°C determined with an automated expansion apparatus (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 643-653 
    Details
    ISSN: 1572-9567
    Keywords: compressibility factors ; expansion apparatus ; methane-ethane mixtures ; PVT ; virial coefficients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An automated expansion apparatus has been set up which can be used for PVT measurements on gases from Il to 60 C at pressures from 2 to 7 NIPa. It consists of two chambers connected by an expansion valve. The ratio of the two volumes is 1:54. The measurements along one isotherm. which take 20 h, can be per formed routinely and without operator attendance. The uncertainty of the com pressibility factor is estimated to be 10−3. The compressibility factors of binary mixtures of the main components of most natural gases, methane and ethane, were determined on high-grade gas, the mole fractions of ethane being 0.05, 0.15. and 0.25. Seven isotherms were measured of each of the mixtures. Data from the literature for the virial coefficients of the pure substances were used to establish a virial equation of state which approximates the measured com pressibility factors with a standard deviation of 0.4 x 10 '. This is substantially smaller than the uncertainty. The interaction virial coefficients were calculated from this equation of state. The results obtained are in good agreement with other available data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438849
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  • 2
    Electronic Resource
    Electronic Resource
    Isochoric pvT measurements of SF6 in the density range 100 to 1200 kg · m−3 (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 791-802 
    Details
    ISSN: 1572-9567
    Keywords: adsorption isotherm ; compressibility factor ; equation of state ; isochoric measurement ; SF6
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The pvT properties of SF6 were determined by an isochoric method. The pressure p and the temperature T were measured in the pressure range 1.5 MPa ⩽ p ⩽ 9.0 MPa and in the temperature range 293 K ⩽ T ⩽ 340 K. The results are compared with data in the literature. The adsorption of SF6 on glass and iron surfaces and its influence on the pvT measurements are also briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503245
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Measurement of the Specific Enthalpy of Vaporization on 1,1,1,2-Tetrafluoroethane in the Temperature Range from 180 to 240 K (1998)
    Springer
    International journal of thermophysics 19 (1998), S. 653-662 
    Details
    ISSN: 1572-9567
    Keywords: Clausius–Clapeyron equation ; enthalpy of vaporization ; R134a ; 1,1,1,1,2-tetrafluoroethane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An apparatus is described which is capable of measuring the enthalpy of vaporization in the temperature range from 100 to 250 K. The sample (R134a; purity, at least 99.999%) is located in the measuring cell at the saturated vapor pressure, p = p s. A control circuit allows p to be kept constant by opening a motor-operated valve to a weighing cylinder after having switched on the electrical measuring cell heater. During the experiment, the temperature is kept constant within a 10mK. In the range 180 to 230 K, the data for R134a are compared with calculated values from the fundamental equation given by Tillner-Roth and Baehr, which is recommended by Annex 18 of the International Energy Agency (IEA) as an international standard. Good agreement within a standard uncertainty of 1.6×10−3 is obtained. At temperatures of only 10 K above the triple-point temperature, the enthalpy of vaporization calculated from the Clausius–Clapeyron equation shows considerable uncertainty due to the determination of the small vapor pressure. It is chiefly in this range that it is advantageous to have the new apparatus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022658015509
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  • 4
    Electronic Resource
    Electronic Resource
    PVT Measurements on tetrafluoroethane (R134a) along the vapor-liquid equilibrium boundary between 288 and 373 K and in the liquid state from the triple point to 265 K (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 1143-1153 
    Details
    ISSN: 1572-9567
    Keywords: gas-liquid phase equilibrium ; isochores ; triple point ; vapor pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For the investigations of the gas-liquid phase equilibria, a new apparatus has been developed capable of simultaneously determining the pressure and the liquid and vapor densities using Archimedes' principle. The relative measurement uncertainties of the liquid and vapor densities of R134a (purity, 99.999%) at 313 K are 2×10−4 and 7×10−4, respectively (95% confidence level). For the measurements in the liquid region along nine quasi-isochores at pressures up to 5 MPa, an isochoric apparatus was used. The relative measurement uncertainty ofpv/(RT) is less than 1×10−3. In addition to the investigation of the (p, v, T) properties, the temperature and pressure at the triple point and the vapor pressure between the triple point and 265 K were measured. On the basis of these data, a vapor pressure correlation has been developed that reproduces the measured vapor pressures within the uncertainty of measurement. The results of our measurements are compared with a fundamental equation for R134a, which is based on the measurements of other research groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02081282
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  • 5
    Electronic Resource
    Electronic Resource
    Terminal deletion of the long arm of chromosome 1 in a malformed newborn (1978)
    Springer
    Human genetics 〈Berlin〉 42 (1978), S. 333-337 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Microcephaly and craniofacial dysmorphia, cleft palate, cardiac malformation, and hypospadias are observed in a child with 46,XY,del (1)(q42).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00291316
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    Paper (German National Licenses)
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