Minimum aberration designs are obtained for two types of mixed-level fractional factorial: (i) (s) × s factorial, and (ii) (s1) × (s2) × s factorial, where s is any prime or prime power, and r, r1, r2 and n are positive integers. Projective geometric tools are employed to find the wordlength pattern of a given design in terms of that of its complementary set. Many useful designs are found

A 32-GHz coupled-cavity maser design is described. The theory and the predicted performance of cavity masers are included. A coupling cavity in the signal waveguide enables tuning of the maser over the 500-MHz-wide deep-space frequency allocation from 31.8 GHz to 32.3 GHz. The ruby cavity is simultaneously resonant at 32 GHz in the TE101 mode and at the pump frequency of 66.4 GHz in the TE301 m...

a chromium electroplating bath with the ability to produce homogenous mist was used to evaluate parameters influencing hexavalent chromium (cr+6) mist sampling methods. the results of 48 cr+6mist samples collected using the u.s. national institute for occupational safety and health method 7600showed that cr+6concentration was higher: (1) for sampling by closed-face filter cassettes than for sam...