University of Illinois Physics Professor Paul Kwiat and members of his research group have developed a new tool for precision measurement at the nanometer scale in scenarios where background noise and ...

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Two methods of constructing equal-interval scales for educational achievement are discussed: Thurstone's absolute scaling method and Item Response Theory (IRT). Alternative criteria for choosing a ...

The U.S. National Institute of Standards and Technology (NIST) has completed significant upgrades to two key instruments serving what the agency calls “critical national needs”. The devices measure ...