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  • 1
    Electronic Resource
    Electronic Resource
    Quantitative Analysis of Helium-3 by Gas Chromatography. (1966)
    s.l. : American Chemical Society
    Analytical chemistry 38 (1966), S. 149-150 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60233a048
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A system for in-situ pressure and ac susceptibility measurements using the diamond anvil cell: Tc(P) for HgBa2CuO4+δ (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 992-997 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Substantial improvements have been made in the sensitivity of an ac susceptibility measurement system which determines the pressure dependence of the superconducting transition temperature, Tc(P). The pressure, P, is determined near Tc from the position of the R1 and R2 fluorescence peaks from ruby chips. The system was used to determine Tc(P) for several high Tc single crystals, but was not sufficiently sensitive to determine Tc(P) of polycrystalline samples for HgBa2CuO4+δ. This motivated us to improve the sensitivity of our system. Other parts of the system and the data analysis procedures also have been improved. As a demonstration, Tc(P) of HgBa2CuO4+δ polycrystal to 4 GPa is presented. The improvement of the system using the diamond anvil cell opens the possibility of measuring Tc above 10 GPa and on smaller samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144878
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Phase diagram and transition properties of condensed ammonia to 10 kbar (1982)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 86 (1982), S. 5219-5222 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100223a030
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Observed coronal temperatures at 1.37R ⊙ in the region of a helmet structure (1975)
    Springer
    Solar physics 40 (1975), S. 387-396 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract During the total solar eclipse, 1965 May 30, a 25 cm aperturef/8.0 telescope and Fabry-Perot interferometer were operated aboard the USAF-AEC aircraft. High resolution spectra of the Fexiv emission line, 530.3 nm, were obtained. Deconvolved intensity vs wavelength profiles of the second order fringe overlay a helmet structure on the NM limb at out to 1.37R ⊙. The profiles yield coronal temperatures, absolute intensities and Doppler velocities in regions of apparently open magnetic field structure and within the closed field lines of the helmet. Together with white light intensities the observations are interpreted to provide temperatures and turbulent velocities in and around this coronal structure. Comparison is made with a model by Billings and Roberts. We suggest a model with radial flow (solar wind) velocities of ∼ 60 km s−1 satisfies the observations in the open field line region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00162385
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  • 5
    Electronic Resource
    Electronic Resource
    Evidence for temporal variations of coronal emission line intensity and profile (1976)
    Springer
    Solar physics 50 (1976), S. 109-112 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The time sequence of line profiles of Fe xiv emission obtained at the 1965 solar eclipse is examined for temporal variations of intensity and profile. Although no variations are found in some regions examined, two regions with intensity and profile line width variations are found. A simple temperature wave is consistent with observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206195
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  • 6
    Electronic Resource
    Electronic Resource
    Coronal emission line profile observations at total solar eclipses (1975)
    Springer
    Solar physics 44 (1975), S. 345-359 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High resolution spectra of the coronal emission line Fe xiv at 530.3 nm obtained at the 30 May 1965 total solar eclipse are analyzed and interpreted. Deconvolution techniques that preserve the line intensity vs wavelength profile shape are developed to obtain further resolution improvement. The west limb coronal enhancement is determined to have temperatures less than 3 MK and turbulent velocities of ∼25 km s-1 decreasing with altitude. Temperature gradients provide evidence for marginal solar wind flow from this enhancement. Above the quiet photosphere in the southwest quadrant the comparison of line and continuum intensities and consideration of line width suggest to us the coronal region is filled with inhomogeneous plasma, dense enough in localized regions to maintain collisional excitation. Solar wind flow from this region obtains when turbulent velocities are assumed to contribute to the line broadening. We identify this region as a coronal hole and suggest that coronal material is heated by the quiet photosphere below.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00153213
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Potential probe dissipation measurements in a flowing superfluid helium film (1971)
    Springer
    Journal of low temperature physics 5 (1971), S. 267-273 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Dissipation along a thermally driven, flowing, superfluid helium film has been measured using an adaptation of the Keller-Hammel potential probes. These data are described by Langer-Fisher fluctuation theory, provided the velocity dependence is characteristic of vortex ring generation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00629704
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  • 8
    Electronic Resource
    Electronic Resource
    Coronal emission line profile observations at total solar eclipses (1975)
    Springer
    Solar physics 44 (1975), S. 331-344 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A 25-cm aperture f/8.0 telescope was operated aboard a U.S. Air Force - Energy Research and Development Administration aircraft at the 30 May 1965 and 12 November 1966 total solar eclipses. A fixed path Fabry-Perot interferometer spectrograph with 0.008-nm resolution was developed to photographically record intensity vs wavelength profiles of the coronal emission lines Fe xiv (530.3 nm), Fe x (637.4 nm) and Ca xv (569.4 nm). A pressure scanned Fabry-Perot interferometer was developed with a photoelectric detector and recorder. Photoelectric tracking was used in 1965 and gyroscopic tracking with photoelectric updating provided improved tracking in 1966. Photographic interferometer data were obtained out to 1.79 R ⊙ in 1965 at 530.3 nm. Doppler shifts are determined and indicate generally small velocities of coronal material. Results in Fe xiv and Fe x were obtained in 1966. No Ca xv emission was detected in 1966.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00153212
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  • 9
    Electronic Resource
    Electronic Resource
    Coronal temperature measurements near a helmet structure base at the 1973 solar eclipse (1984)
    Springer
    Solar physics 94 (1984), S. 239-247 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Observations of coronal Fe XIV emission lines from the NE quadrant during the 1973 solar eclipse are reported. Temperatures are deduced from a pure thermal broadening model, and, in the region near an observed white-light enhancement, an alternative interpretation of halfwidth as being in part due to turbulent velocities is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151316
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  • 10
    Electronic Resource
    Electronic Resource
    Pressure dependence of Tc in Tl0.2Hg0.8Ba2Ca2Cu3Ox (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 615-616 
    Details
    ISSN: 1572-9605
    Keywords: (Hg,Tl)-Ba-Ca-Cu-O ; pressure effect ; ac susceptibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We report results of our study of the pressure dependence of Tc in Tl0.2Hg0.8Ba2Ca2Cu3Ox to 6 GPa in a diamond anvil cell. The sample studied has an ambient Tc of 136.4 K and application of quasihydrostatic pressure raised Tc to 144.4 K at 6 GPa. We will also describe recent modifications of our ac susceptibility apparatus that have improved our sensitivity while simplifying the coil design and the balancing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00727443
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