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  • 1
    Series available for loan
    Series available for loan
    Improvement of viscosity measurements using oscillation drop techniques with electrostatic levitators (2010)
    [Tokyo] : Japan Aerospace Exploration Agency
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    Call number: ZSP-405a-10-0049
    In: JAXA Research and Development Report
    Description / Table of Contents: Electrostatic levitators use strong electric fields to levitate and accurately position a sample against gravity. In this study, the effects of the electric field are investigated with regards to viscosity measurements conducted with the oscillating drop method. The effects of the external field on viscosity measurements are experimentally confirmed by changing the sample size. Moreover, a numerical simulation based on a simple mass-spring-damper system can reproduce the experimentally observed effects. Based on the above results, measurement procedures were improved. These help to minimize the effect of the positioning force and increase the accuracy of the viscosity measurements.
    Type of Medium: Series available for loan
    Pages: 16 S. : graph. Darst.
    Series Statement: JAXA Research and Development Report 09-002E
    URL: http://repository.tksc.jaxa.jp/pl/dr/AA0064541000/en
    Branch Library: AWI Library
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  • 2
    Series available for loan
    Series available for loan
    Thermophysical properties of liquid and supercooled rare earth elements measured by an electrostatic levitator : Takehiko Ishikawa, Paul-François Paradis, Yuki Watanabe ... (2008)
    [Tokyo] : Japan Aerospace Exploration Agency
    Associated volumes
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    Call number: ZSP-405a-08-0048
    In: JAXA Research and Development Report
    Type of Medium: Series available for loan
    Pages: 13 S. : graph. Darst.
    Series Statement: JAXA Research and development report RR-07-014E
    Language: English
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 3
    Monograph available for loan
    Monograph available for loan
    Thermophysical properties of liquid and supercooled rare earth elements measured by an electrostatic levitator (2009)
    [Tokyo] : Japan Aerospace Exploration Agency
    Associated volumes
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    Call number: ZSP-405a-09-0019
    In: JAXA Research and Development Report
    Type of Medium: Monograph available for loan
    Pages: 14 S. : graph. Darst.
    Series Statement: JAXA Research and Development Report RR-08-003E
    Language: English
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 4
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    Monograph available for loan
    Non-contact thermophyiscal property measurements of liquid and supercooled osmium (2007)
    [Tokyo] : Japan Aerospace Exploration Agency
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    Call number: ZSP-405a-07-0076
    In: JAXA Research and Development Report
    Type of Medium: Monograph available for loan
    Pages: 9 S.
    Series Statement: JAXA Research and development report RR-06-012E
    Language: English
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 5
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    Non-contact thermophysical property measurements of refractory metals using an electrostatic levitator (2005)
    [Tokyo] : Japan Aerospace Exploration Agency
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    Call number: ZSP-405-06-0029
    In: JAXA Research and Development Report
    Type of Medium: Series available for loan
    Pages: 41 S.
    Series Statement: JAXA Research and development report RR-04-024E
    Language: English
    Branch Library: GFZ Library
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  • 6
    Electronic Resource
    Electronic Resource
    Contactless Density Measurement of Liquid Nd-Doped 50%CaO–50%Al2O3 (2003)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 86 (2003), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The density of neodymium-doped calcium aluminate (〈1 mol% Nd2O3·50% CaO·50% Al2O3) liquid was measured over a wide temperature range using an electrostatic levitation furnace. The density was obtained using an UV-based imaging technique that allowed excellent illumination throughout all phases of processing, including elevated temperatures. Over the 1560–2000 K temperature range, the density could be expressed as ρ(T) = 2.83 × 103– 0.21(T–Tm) (kg·m−3) (±2%) with Tm= 1878 K, which yielded a volume coefficient of thermal expansion α(T) = 7.5 × 10−5 K−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2003.tb03642.x
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  • 7
    Electronic Resource
    Electronic Resource
    Noncontact electrical resistivity measurement technique for molten metals (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 3628-3633 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A noncontact technique of measuring the changes in electrical conductivity (or resistivity) of conducting liquids is reported. The technique is based on a conducting drop that is levitated by the high-temperature electrostatic levitator in a high vacuum. This technique, which utilizes the principle of the asynchronous induction motor, measures the relative changes in torque as a function of temperature by applying a rotating magnetic field to the sample. Changes in electrical resistivity are related to the changes in measured torque using the formula developed for the induction motor. Validity of this technique was demonstrated using a pure aluminum sample around its melting temperature. When the measurement results were calibrated by a literature value of resistivity at the melting point, our resistivity data around the melting point could be expressed by rliq=24.19+1.306×10−2(T−Tm) μΩ cm over Tm∼1160 K, rsolid=10.77+1.421×10−2(T−Tm) μΩ cm over 700 K∼Tm, and the thermal conductivity as determined by the Wiedemann–Franz–Lorenz law from the resistivity data was given by κliq(T)=94.61+4.41×10−2(T−Tm) W m−1 K−1, κsolid(T)=211.13−7.57×10−2(T−Tm) W m−1 K−1. Both electrical resistivity and thermal conductivity are in close agreement with the literature, confirming the validity of the present technique. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149150
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  • 8
    Electronic Resource
    Electronic Resource
    Noncontact surface tension measurement by drop rotation (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 3572-3575 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Validity of the surface tension measurement technique that was proposed by Elleman et al. was experimentally verified. The technique was based on Brown and Scriven's work on the shape evolution of rotating drops. Molten tin and aluminum drops were levitated in high vacuum by the electrostatic levitator and rotated by applying a rotating magnetic field. This technique offers an alternative technique for those liquids where the drop oscillation technique cannot be used. As a demonstration, the technique was applied to a glass-forming alloy (Zr41.2Ti13.8Cu12.5Ni10.0Be22.5) and its surface tension was measured down to the lower temperature where the drop oscillation technique could not be applied due to its high viscosity. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1388215
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  • 9
    Electronic Resource
    Electronic Resource
    Hybrid electrostatic–aerodynamic levitation furnace for the high-temperature processing of oxide materials on the ground (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 2811-2815 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This article describes a hybrid electrostatic–aerodynamic levitation furnace for the containerless processing and study of oxide materials on the ground. Its operation principle relies on an aerodynamic levitator that allows sufficient electric charge to be accumulated on a sample, due to high-temperature heating, before electrostatic levitation can be effective. The article discusses the concept of this new levitator and presents the proof of the technical feasibility of electrostatically levitating and melting oxide material samples (BiFeO3, 49.5CaO–50.5Al2O3 mol %) in a pressurized atmosphere. In addition, superheating–undercooling cycles can be performed while maintaining an exceptional sample positioning stability along the three directions. Moreover, we report the first vitrification of dielectric oxide material samples (49.5CaO–50.5Al2O3 mol %) using an electrostatic levitation method. The article also discusses the advantages of this facility compared with other existing instruments for the containerless processing of oxide materials, in particular, with respect to molten sample position stability and hydrodynamic quietness, long duration levitation times, and open field of view of the sample. The facility is, in its current state, capable of novel glass synthesis. Moreover, it shows great promise for structural and thermophysical properties characterization and metastable phase studies when supplemented with the appropriate diagnostic tools. The demonstration of melting and vitrifying oxide material is also a corner stone for the design of a containerless research facility in microgravity. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1368860
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  • 10
    Electronic Resource
    Electronic Resource
    New sample levitation initiation and imaging techniques for the processing of refractory metals with an electrostatic levitator furnace (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 2490-2495 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Two new methods that substantially ease the processing and study of refractory metals, when an electrostatic levitation furnace is used, are reported. The first technique is concerned with preheating the sample on a pedestal, prior to launch, to a temperature (∼1500 K) at which thermionic emission dominates all other charging/discharging mechanisms that may be going on simultaneously. Launched into levitation at that temperature, the sample can be quickly heated to its molten state without encountering further charge loss problems. This procedure thus shortens substantially the time it takes to bring the samples to their final high temperature states at which their thermophysical properties can be measured. This technique can be applied to most materials whose melting temperatures are higher than their thermionic temperatures. The second technique described is an ultraviolet-based sample imaging configuration. Due to the excellent sample–background contrast it continuously provides during all phases of processing (from solid to overheated liquid sample), it allows the measurements of the density and the ratio of constant pressure heat capacity over hemispherical total emissivity of refractory metals. This method, compared with other imaging techniques, leads to more accurate density data at very high temperatures and to density temperature coefficients closer to those reported in the literature. This is exemplified in this article with zirconium and niobium liquid samples. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1368861
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