"High temperature superconductors." . . "Microstructure." . . . . "Magnetic permeability." . . . . . . "Second semi-annual progress report"@en . . . . "Evaluation, developement [sic], and characterization of superconducting materials for space application second semi-annual progress report"@en . . . . . . . . . . . "Evaluation, development, and characterization of superconducting materials for space application"@en . . "Transition temperature." . . "Copper oxides." . . "Electric current." . .