New Results From Previously Reported NBS Fundamental Constant Determinations.

A new treatment of previously reported results of three electric-unit-dependent fundamental constant experiments carried out at NBS over the last decade or so yields accurate, indirect values in SI units for a number of important quantities. These include the fine-structure constant α, the Avogadro constant N A, the Josephson frequency-voltage ratio 2e/h, and the quantized Hall resistance R H≡h/e 2.

[1]  T. P. Orlando,et al.  The role of disorder in maximizing the upper critical field in the Nb-Sn system , 1981 .

[2]  K. Best,et al.  New measurements of critical data of optimized NBTi superconductors , 1977 .

[3]  B. Matthias,et al.  High-Field, High-Current Superconductors , 1980, Science.

[4]  Y. Shapira,et al.  Nb--25 Zr in strong magnetic fields: magnetic, resistive, ultrasonic, and thermal behavior , 1966 .

[5]  L. Pintschovius,et al.  The Phase Relationships in Nb3Sn Wires at Low Temperatures as Detected by Crystallographical (Neutron and X-ray Diffraction) and by Physical [Bc2(T), Jc vs. ɛ] Measurements , 1982 .

[6]  D. Larbalestier,et al.  Workshop on superconductors for magnets: Frontiers of technology , 1981 .

[7]  Stuart L. Meyer,et al.  Data analysis for scientists and engineers , 1975 .

[8]  D. Larbalestier.  Superconducting materials--A review of recent advances and current problems in practical materials , 1981 .

[9]  H. Habermeier.  Disorder and the upper critical field of Nb 3 Ge , 1981 .

[10]  D. Larbalestier.  Nb-Ti Alloy Superconductors—Present Status and Potential for Improvement , 1980 .

[11]  R. Powell,et al.  Definitions of terms for practical superconductors. 2. Critical parameters , 1978 .

[12]  B. G. Kyle,et al.  Chemical and process thermodynamics , 1984 .

[13]  C. L. Young,et al.  Physicochemical measurement by gas chromatography , 1979 .

[14]  J. K. Hulm,et al.  Superconductors in electric-power technology , 1980 .

[15]  Henry Eyring,et al.  Hydrogen in metals , 1948 .

[16]  G. Rupp,et al.  Upper critical field in multifilamentary Nb 3 Sn conductors , 1981 .

[17]  G. Stewart.  Measurement of low-temperature specific heat , 1983 .

[18]  J. Cave,et al.  Cracking and layer growth in Nb 3 Sn Bronze route material , 1983 .

[19]  D. Grant,et al.  Gas-liquid chromatography , 1971 .

[20]  W. Schauer,et al.  Microstructure and superconductivity of some C15 laves phase alloys: V 2 Hf, V 2 Hf .51 Nb .49 and V 2 Hf .51 Nb .21 Ti .28 , 1981 .

[21]  K. Denbigh,et al.  The Principles of Chemical Equilibrium , 1956 .

[22]  Loren F. Goodrich,et al.  Critical current measurements: A compendium of experimental results , 1982 .

[23]  W. G. Brombacher,et al.  Mercury Barometers and Manometers , 1960 .

[24]  W. Webb,et al.  Hysteresis in Superconducting Alloys-Temperature and Field Dependence of Dislocation Pinning in Niobium Alloys , 1969 .

[25]  R. Scanlan,et al.  The effect of strain on the martensitic phase transition in superconducting Nb 3 Sn , 1981 .

[26]  S. Sandler.  Chemical and engineering thermodynamics , 1977 .

[27]  B. W. Roberts.  Survey of superconductive materials and critical evaluation of selected properties , 1976 .

[28]  J. E. Evetts,et al.  The characterization of superconducting materials - conflicts and correlations , 1983 .

[29]  G. Cody.  Phenomena and Theory of Superconductivity , 1973 .

[30]  J. Ekin,et al.  Mechanical Properties and Strain Effects in Superconductors , 1981 .

[31]  H. Matsumoto,et al.  Interplay between magnetism and superconductivity , 1983 .

[32]  R. L. Pecsok,et al.  Physicochemical Applications of Gas Chromatography , 1978 .

[33]  C. Rosner,et al.  Advances in superconductive magnets and materials , 1974 .

[34]  J. S. Rowlinson,et al.  Molecular Thermodynamics of Fluid-Phase Equilibria , 1969 .

[35]  Robert L. Powell,et al.  Thermocouple Reference Tables Based on the IPTS-68 , 1974 .

[36]  R. Powell,et al.  Definitions of terms for practical superconductors 1. Fundamental states and flux phenomena , 1977 .

[37]  C. Cowper,et al.  The analysis of gases by chromatography , 1983 .

[38]  Edward J. Kramer,et al.  Scaling laws for flux pinning in hard superconductors , 1973 .

[39]  O. Fischer,et al.  Measurements of critical fields up to 500 kG in the ternary molybdenum sulphides , 1974 .

[40]  R. Soulen,et al.  The equivalence of the superconducting transition temperature of pure indium as determined by electrical resistance, magnetic susceptibility, and heat-capacity measurements , 1971 .

[41]  R. Flükiger.  Phase Relationships, Basic Metallurgy, and Superconducting Properties of Nb3Sn and Related Compounds , 1982 .

[42]  S. Morohashi,et al.  Thermodynamic properties and fundamental parameters of single crystal Cu1.8Mo6S8 , 1981 .

[43]  R. Hein,et al.  Differential Paramagnetic Effect in Superconductors , 1961 .

[44]  John K. Hulm,et al.  The road to superconducting materials , 1981 .

[45]  D. Larbalestier.  Niobium-Titanium Superconducting Materials , 1981 .

[46]  D. Larbalestier,et al.  Enhanced Values of H c2 in Nb-Ti Ternary and Quaternary Alloys , 1980 .

[47]  J. Wishart,et al.  Statistics in Research. , 1956 .

[48]  P. Sanger,et al.  The temperature and magnetic field dependence of superconducting critical current densities of multifilamentary Nb 3 Sn and NbTi composite wires , 1979 .

[49]  J. K. Hulm,et al.  Overview of Superconducting Materials Development , 1981 .

[50]  E. Heftmann.  Chromatography: A laboratory handbook of chromatographic and electrophoretic methods , 1975 .

[51]  B. B. Schwartz,et al.  Effects of material parameters on Hc2 in A15 superconductors , 1979 .