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The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform

Ziyad M Hijazi - One of the best experts on this subject based on the ideXlab platform.

L Ruby - One of the best experts on this subject based on the ideXlab platform.

  • Physiological Units in the SI
    Metrologia, 1993
    Co-Authors: R A Nelson, L Ruby
    Abstract:

    A modified system of SI units is described that includes a new category of physiological units. In this system, physiological units are a special class of derived units that are defined with respect to specified reference stimuli for the purpose of calibrating the nominal human response to external physical effects. This new category includes the unit of luminous intensity, the candela, and the unit of dose equivalent, the Sievert. By comparison with the current SI, in the modified SI the candela is classified as a physiological derived unit instead of as a base unit and the definition of the Sievert is revised to include specification of the reference radiation.

Wei-e Wang - One of the best experts on this subject based on the ideXlab platform.

  • Thermodynamic evaluation of the titanium-hydrogen system
    Journal of Alloys and Compounds, 1996
    Co-Authors: Wei-e Wang
    Abstract:

    Abstract Thermodynamic constraints, together with a modified form of Sieverts law, are used to evaluate the partial and integral thermodynamic functions of the TiH system from 400 to 1010 K. Satisfactory pCT relationships for each phase have been developed, even in regions where no data are available. The results are presented as hydrogen isobars superimposed on the phase diagram. The discrepancies in the Sieverts law constant for αTi and the standard free energy of formation of TiH2 have been resolved.

Horst Sievert - One of the best experts on this subject based on the ideXlab platform.

E. Maca. Gray - One of the best experts on this subject based on the ideXlab platform.

  • Misconceptions in the application of the Sieverts technique
    International Journal of Hydrogen Energy, 2013
    Co-Authors: Colin J. Webb, E. Maca. Gray
    Abstract:

    The Sieverts technique is commonly used for determining gas uptake, particularly for hydrogen storage material characterisation. Despite a considerable literature on correct technique, best practice and sources of potential errors, there is still confusion concerning application of this technique. We address three aspects of the Sieverts technique, (thermal transpiration, volume calibration and the effect of valve volume) in the context of a recent publication.

  • Sieverts apparatus and methodology for accurate determination of hydrogen uptake by light-atom hosts
    Journal of Alloys and Compounds, 2006
    Co-Authors: T.p. Blach, E. Maca. Gray
    Abstract:

    Accurate determination of the quantity of hydrogen absorbed by a potential hydrogen storage material is crucial to progress in the field. The most common techniques for measuring hydrogen uptake from the gas phase by a solid host, the Sieverts technique and gravimetry, both become susceptible to systematic errors as the density of the host material decreases. We focus here on the Sieverts technique, which in a poorly designed apparatus may produce errors ∼100% in the quantity of absorbed hydrogen owing to a realistic 25% error in the density of a light-atom sample. Using hydrogen absorption isotherms measured for low-density materials, including carbon nanotubes, potassium-intercalated graphite and lithium nitride, we show that designing the Sieverts apparatus with carefully chosen volumes greatly lessens the impact of uncertainty in the sample density. Rules-of-thumb for the volumes in the apparatus and the volume occupied by the sample itself, and a figure of merit for the sensitivity of the system to changes in the hydrogen content of the sample, are introduced.

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