Publications

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A Theory of Sensitized Luminescence in Solids

The term ``sensitized luminescence'' in crystalline phosphors refers to the phenomenon whereby an impurity (activator, or emitter) is enabled to luminesce upon the absorption of...

1953 The Journal of Chemical Physics 8677 citations

Risk, Uncertainty and Profit

In Risk, Uncertainty and Profit, Frank Knight explored the riddle of profitability in a competitive market profit should not be possible under competitive conditions, as the ent...

1921 8637 citations

National Council of Teachers of Mathematics

Organized groups of teachers of mathematics or of individuals preparing to become teachers of mathematics may petition the NCTM Board of Directors to become affiliated with the ...

1979 Mathematics Teacher Learning and Teac... 8527 citations