An acoustooptic technique was used to design and construct a prototype of a processor capable of multiplying a 128 x 128 complex-element matrix by a 128 complex-element vector. The device was specified to execute 10(5) matrix-vector products per second with 8-bit resolution. The performance of each component of the prototype was evaluated, as was the impact of component performance on system performance.

Consider a conducting circuit moving with velocity v through a constant magnetic field B. The induced emf is given by  ∫ v × B · dl where the integral is taken once around the circuit. Some texts refer to v × B as the force the magnetic field exerts on a unit charge moving around the circuit. This is incorrect as magnetic forces can never do work. The force the conductor exerts on an electron is shown to do this work.

2SECURIT'e C A5FiPCAT ON AuL7HORIWY 3 D'5PiL,-i1 avN A~a A 2b DECLASSiFCA71ON D>OWdNGRA01NG SCHED LE Aoproved for public release; distribution unlimited. 4 PERFORMING ORGANIZATION REPORT' NUMBER(S) 5 VION17ORING DRGAN ,ZA-SN NRL Memorandum Report 6372 6a NAME OF PERFORMING ORGANIZATION 60 09F< CSYVMBOL 'a NAME 3F 'AO"J'OP 'C Z r2 (If applicable) Naval Research Laboratory Code 6330 6c. ADDRESS (City, State. and ZIP Code) Th AOODPESS City, State :in, zR C.;0e' Washington, DC 20375-5000 8a. NAME OF FUNDING, SPONSORING 8b OFF CE S*MB0L 9 ' 0 OC-REMENT7 NS-RLEN-:)E,-CA-OC% ORGANIZATION O (f applicable) Office ofNavalTechnologv _______ 8C. ADDRESS (City, State, and ZIP Code) 0SOuRCE OF 'N '4V~NBERS POOGRA IPOEC-A ~ .và rigoV 21-00:EEM EN 14 NO NO 'OASO NO Arigon A221-00PE 62314 RJ 14C37 DN380-06 2 7 1 I ~iTLE (include Security Classficatnon)

No abstract

The effective length of a flag executing photogate transit varies from photogate to photogate. It also varies with the position in the gap where it crosses the beam, and with the speed of the flag. Measurements were made using 23 photogates (the PASCO model 9204 and its newly updated version, the model 9204A). The flags were 11.66-mm-diam cylinders. The effective length of these flags was found to vary from photogate to photogate by up to 20%; vary with gap position by up to 8%; decrease by about 0.2% per meter/second with flag speed. Measurements and analysis are presented along with suggestions for minimizing systematic errors when using photogates in the laboratory.