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  • 1
    Monograph available for loan
    Monograph available for loan
    Non-contact thermophyiscal property measurements of liquid and supercooled osmium (2007)
    [Tokyo] : Japan Aerospace Exploration Agency
    Associated volumes
    Details Availability
    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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  • 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
    Details Availability
    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
    Series available for loan
    Series available for loan
    Non-contact thermophysical property measurements of refractory metals using an electrostatic levitator (2005)
    [Tokyo] : Japan Aerospace Exploration Agency
    Associated volumes
    Details Availability
    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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  • 4
    Electronic Resource
    Electronic Resource
    Study of the aerodynamic trap for containerless laser materials processing in microgravity (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 262-270 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In the context of containerless laser processing of glasses in microgravity, a systematic study of the aerodynamic trap (ADT) has been done on the ground at both ambient and very high temperatures ((approximately-greater-than)2000 K). This work yielded a better understanding of the ADT and helped in improving its design. Experiments indicate that restoring force and sample stability depend upon the diffuser's interior angle, flow rate, and ratio of sample to diffuser's throat diameters. It was found that the trap's potential energy curve versus position had a barrier height that increased with flow rate but decreased with increasing angle of the diffuser. Small angle diffusers show a greater spatial extent of the potential well, higher sphere-to-wall distances, and greater sample stability than larger angle diffusers. Low flow rates give quieter environments (smaller oscillations and perturbations due to the gas flow) than higher flow rates even though they are sufficient to trap the sample and damp external perturbations. Heat loss by forced air cooling is thus reduced, enabling the processing of larger samples for a given laser power. The research suggests that for dielectric samples of ≈3 mm diameter, at ambient, as well as at high temperature, where stability is a necessity, the ADT should be a small angle diffuser (30°–60°) operated at low flow rate (〈4.4 l/min with a 1 mm throat diameter). These conditions allow stable positioning for ambient as well as for high-temperature containerless materials sciences experiments on the ground and in microgravity. The sample should stay positioned and contactless even during large acceleration variations (2 g–μg) with minimum perturbation allowing its use in a KC-135 aircraft environment. Also, a spherical sample whose size varies through evaporation can be continuously trapped in a unique conical diffuser as long as its diameter is greater than that of the throat. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146581
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  • 5
    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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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Noncontact technique for measuring surface tension and viscosity of molten materials using high temperature electrostatic levitation (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 2796-2801 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new, noncontact technique is described which entails simultaneous measurements of the surface tension and the dynamic viscosity of molten materials. In this technique, four steps were performed to achieve the results: (1) a small sample of material was levitated and melted in a high vacuum using a high temperature electrostatic levitator, (2) the resonant oscillation of the drop was induced by applying a low level ac electric field pulse at the drop of resonance frequency, (3) the transient signals which followed the pulses were recorded, and (4) both the surface tension and the viscosity were extracted from the signal. The validity of this technique was demonstrated using a molten tin and a zirconium sample. In zirconium, the measurements could be extended to undercooled states by as much as 300 K. This technique may be used for both molten metallic alloys and semiconductors. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149797
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  • 8
    Electronic Resource
    Electronic Resource
    Laser-induced rotation of a levitated sample in vacuum (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 4652-4655 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A method of systematically controlling the rotational state of a sample levitated in a high vacuum using the photon pressure is described. A zirconium sphere was levitated in the high-temperature electrostatic levitator and it was rotated by irradiating it with a narrow beam of a high-power laser on a spot off the center of mass. While the laser beam heated the sample, it also rotated the sample with a torque that was proportional both to the laser power and the length of the torque arm. A simple theoretical basis was given and its validity was demonstrated using a solid zirconium sphere at ∼2000 K. This method will be useful to systematically control the rotational state of a levitated sample for the containerless materials processing at high temperature. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150127
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Enzymatic Production of α-Butylglucoside and Its Fatty Acid Esters (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 799 (1996), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1996.tb33268.x
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