Results 241 to 250 of about 80,438 (295)

Priming Effect of Seeds with Niobium (Nb) on the Performance of Maize Plants Under Water Deficit Conditions. [PDF]

open access: yesPlants (Basel)
Evangelista MNL   +7 more
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Superconductivity in niobium and niobium-rich niobium-tantalum alloys

Physics Letters A, 1968
Abstract Magnetization measurements in superconducting Nb and Nb-rich NbTa alloys show that the discrepancies between experiment and theory in k 1 and k 2 as function of temperature in Nb do not come from its non-weak coupling nature but probably from the anisotropic electronic structure.
A. Ikushima, T. Mizusaki, T. Odaka
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Corrosion of Niobium and Niobium Alloys

2005
Abstract For chemical processing, niobium resists a wide variety of corrosive environments, including mineral acids, many organic acids, liquid metals, and most salt solutions. This article focuses on the mechanisms of corrosion resistance of niobium alloys in these environments.
Richard C. Sutherlin, Ronald A. Graham
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Niobium and niobium alloys in nuclear power

Nuclear Engineering and Design, 1972
Abstract Niobium and its alloys have been evaluated for a number of terrestrial and space nuclear powered system. After a decade of research and development, many alloys have been developed which meet many of the requirements of long time, high temperature service. A remaining outstanding problem is their interaction with active gases and high purity
D.C. Goldberg, G. Dicker, S.A. Worcester
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Determination of niobium in zirconium-niobium alloys

Analytica Chimica Acta, 1964
Abstract A rapid control determination of niobium in 50% zirconium/50% niobium master-alloy is described; it is a direct spectrophotometric procedure, based on the reaction of niobium ions with hydrogen peroxide in concentrated sulphuric acid. The procedure is suitable for the examination of zirconium alloys containing niobium in the range 0.1 to ...
D.P. Wood, M.R. Adams
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Superconductivity in niobium and niobium-tantalum alloys

Journal of Physics and Chemistry of Solids, 1969
Abstract From magnetization measurements in superconducting Nb and Nb-rich Nb-Ta alloys, it was found that the discrepancies between experiment and theory in the upper critical field and two Ginzburg-Landau parameters as a function of temperature in pure Nb are directly related to the anisotropy of the superconducting energy gap, and not to its non ...
Akira Ikushima, Takao Mizusaki
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Lattice Dynamics of Niobium

Physical Review Letters, 1963
The frequency/wave-vector dispersion relation for symmetry directions in niobium was measured at 296 deg K by means of inelastic neutron scattering. Analysis of the data on the basis of the Born-von Karman theory indicates that the effective interatomic forces are of very long range.
Y. NAKAGAWA, A.D.B. WOODS
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The oxidation of niobium and the structure of niobium oxides

Soviet Physics Journal, 1966
Results are given for the oxidation kinetics of niobium in air at 500–1000 °C, together with x-ray data on the oxides; α-Nb2O5 (orthorhombic) is formed up to 850 °C, and above this β-Nb2O5, also orthorhombic but with lattice constants nearly twice as large. The physics of the oxidation is discussed.
M. P. Arbuzov, V. G. Chuprina
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