Per Scholas programs. Per Scholas brings more than 20 years of experience in recovering, handling and processing retired IT equipment. Per Scholas was featured in WIRED magazine in November 2014. Four Per Scholas graduates were featured in the New York Times in the winter of 2014. In 2012, Per Scholas was named one of America's top-performing nonprofit organizations by the Social Impact Exchange S&100 Index for its impressive outcomes and results-driven work. Per Scholas received a Heroes Award from the Robin Hood Foundation in 2011. The Per Scholas board of directors includes several prominent professionals in the IT field. Current Chairman Lewis
Per-unit system formula_37 Per-unit system In the power systems analysis field of electrical engineering, a per-unit system is the expression of system quantities as fractions of a defined base unit quantity. Calculations are simplified because quantities expressed as per-unit do not change when they are referred from one side of a transformer to the other. This can be a pronounced advantage in power system analysis where large numbers of transformers may be encountered. Moreover, similar types of apparatus will have the impedances lying within a narrow numerical range when expressed as a per-unit fraction of the equipment rating, even if the unit