A convenient handheld locator is provided for locating an item in an urban environment in which the locator is programmed to search for and locate specific items, with the detected item being displayed on the locator as to its identity or name, also displaying where the item is relative to the locator, as to position and range. The secretion of a protein of interest having a substantially non-polar carboxy tail is enhanced by the placement of charged amino acid residues at the carboxy terminus either by adding to the native peptide or by replacing, i. The techniques may use rng to produce values that cannot be predicted by any polynomial time algorithm. A rotor position estimating part estimates a rotor position of the synchronous generator from the detected voltage and current. The set of equations used to determine the coefficients results from taking derivatives of the action integral with respect to the coefficients and setting the derivative equal to zero, thereby extremizing the action integral. In some embodiments, the binary Group III-nitride HEMTs include a first binary Group III-nitride barrier layer, a binary Group III-nitride channel layer on the first barrier layer; and a second binary Group III-nitride barrier layer on the channel layer.