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  • HFC-125  (3)
  • HFC-134a  (2)
  • 550 - Earth sciences  (1)
  • Astrophysics  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The thermal conductivity of CFC alternatives HFC-125 and HCFC-141b in the liquid phase (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 279-292 
    Details
    ISSN: 1572-9567
    Keywords: CFC-alternatives ; HCFC-141b ; HFC-125 ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The liquid thermal conductivities of the CFC alternatives, HFC-125, and HCFC-141b measured by a transient hot-wire apparatus with one bare platinum wire are reported in the temperature ranges from 193 to 333 K (HFC-125, CHF2, CF3) and from 193 to 393 K (HCFC-141b,CCI2F-CF3), in the pressure ranges from 2 to 30 MPa (HFC-125) and from 0.1 to 30 MPa (HCFC-141b), respectively. The results have been estimated to have an accurancy of ±0.5%. The liquid thermal conductives obtained have been correlated by a polynomial of temperature and pressure which can represent the experimental results within the standard deviations of 0.49% for HFC-125 and 0.46% for HCFC-141b, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01443393
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal Conductivity of HFC-32, HFC-125, and HFC-134a in the Solid Phase (1998)
    Springer
    International journal of thermophysics 19 (1998), S. 415-425 
    Details
    ISSN: 1572-9567
    Keywords: HFC-32 ; HFC-125 ; HFC-134a ; melting point ; refrigerant ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the thermal conductivity of HFC-32, HFC-125, and HFC-134a were carried out for the first time in both solid and liquid phases at the saturation pressure at room temperature and in the temperature ranges from 120 to 263, from 140 to 213, and from 130 to 295 K, respectively. A transient hot-wire instrument using one bare platinum wire was employed for measurements, with an uncertainty of less than ±2%. The experimental results demonstrated that the thermal conductivity of HFC-32, HFC-125, and HFC-134a in the solid phase showed a positive temperature dependence. For HFC-32 and HFC-125, there were big jumps between the solid and the liquid thermal conductivity at the melting point. But for HFC-134a, the solid and liquid thermal conductivity at the melting point is almost-continuous.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022509310134
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  • 3
    Electronic Resource
    Electronic Resource
    Prediction of the Thermal Conductivity and Viscosity of Binary and Ternary HFC Refrigerant Mixtures (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 23-34 
    Details
    ISSN: 1572-9567
    Keywords: HFC-32 ; HFC-125 ; HFC-134a ; hard-sphere theory ; mixture ; refrigerant ; 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 prediction of the thermal conductivity and the viscosity of binary and ternary HFC refrigerant mixtures, consisting of HFC-32, HFC-125, and HFC-134a. In this prediction scheme, the hypothetical molecular parameters of HFC refrigerant mixtures were assumed to be the molar average of the pure component values. The close agreement between the predicted values and the experimental results of thermal conductivity and viscosity demonstrate the predictive power of this scheme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006696518938
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  • 4
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    M31N 2008-12a-The Remarkable Recurrent Nova in M31-Panchromatic Observations of the 2015 Eruption (2016)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Andromeda Galaxy recurrent nova M31N 2008-12a had been observed in eruption 10 times, including yearly eruptions from 2008 to 2014. With a measured recurrence period of Prec = 351+/-13 days (we believe the true value to be half of this) and a white dwarf very close to the Chandrasekhar limit, M31N 2008-12a has become the leading pre-explosion supernova type Ia progenitor candidate. Following multi-wavelength follow-up observations of the 2013 and 2014 eruptions, we initiated a campaign to ensure early detection of the predicted 2015 eruption, which triggered ambitious ground- and space-based follow-up programs. In this paper we present the 2015 detection, visible to near-infrared photometry and visible spectroscopy, and ultraviolet and X-ray observations from the Swift observatory. The LCOGT 2 m (Hawaii) discovered the 2015 eruption, estimated to have commenced at August 28.28 +/- 0.12 UT. The 2013-2015 eruptions are remarkably similar at all wavelengths. New early spectroscopic observations reveal short-lived emission from material with velocities approx. 13,000 km/s, possibly collimated outflows. Photometric and spectroscopic observations of the eruption provide strong evidence supporting a red giant donor. An apparently stochastic variability during the early supersoft X-ray phase was comparable in amplitude and duration to past eruptions, but the 2013 and 2015 eruptions show evidence of a brief flux dip during this phase. The multi-eruption Swift/XRT spectra show tentative evidence of high-ionization emission lines above a high-temperature continuum. Following Henze et al. (2015a), the updated recurrence period based on all known eruptions is Prec 174 +/- 10 days, and we expect the next eruption of M31N 2008-12a to occur around 2016 mid-September.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN44015 , The Astrophysical Journal (ISSN 2041-8205) (e-ISSN 2041-8213); 833; 2; 149
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The boundary between the Indian and Asian tectonic plates below Tibet (2010)
    In:  Proceedings of the National Academy of Sciences of the United States of America (PNAS)
    Details
    Publication Date: 2020-02-12
    Description: The fate of the colliding Indian and Asian tectonic plates below the Tibetan high plateau may be visualized by, in addition to seismic tomography, mapping the deep seismic discontinuities, like the crust-mantle boundary (Moho), the lithosphere-asthenosphere boundary (LAB), or the discontinuities at 410 and 660 km depth. We herein present observations of seismic discontinuities with the P and S receiver function techniques beneath central and western Tibet along two new profiles and discuss the results in connection with results from earlier profiles, which did observe the LAB. The LAB of the Indian and Asian plates is well-imaged by several profiles and suggests a changing mode of India-Asia collision in the east-west direction. From eastern Himalayan syntaxis to the western edge of the Tarim Basin, the Indian lithosphere is underthrusting Tibet at an increasingly shallower angle and reaching progressively further to the north. A particular lithospheric region was formed in northern and eastern Tibet as a crush zone between the two colliding plates, the existence of which is marked by high temperature, low mantle seismic wavespeed (correlating with late arriving signals from the 410 discontinuity), poor Sn propagation, east and southeast oriented global positioning system displacements, and strikingly larger seismic (SKS) anisotropy.
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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