Gray arrays and Gray tori

ℤ4-codes and their Gray map images as orthogonal arrays

A classic result of Delsarte connects the strength (as orthogonal array) of a linear code with the minimum weight of its dual: the former is one less than the latter. Since the paper of Hammons et al., there is a lot of interest in codes over rings, especially in codes over Z4 and their (usually non-linear) binary Gray map images. We show that Delsarte’s observation extends to codes over arbitr...

Reduction photolithography using microlens arrays: applications in gray scale photolithography.

This paper describes the application of reduction photolithography, using arrays of microlenses and gray scale masks, to generate arrays of micropatterns having multilevel and curved features in photoresist. This technique can fabricate, in a single exposure, three-dimensional microstructures (e.g., nonspherical microlens arrays) over areas of approximately 2 x 2 cm2. The simple optical configu...

Aging and dementia: more gray hair and less gray matter.

Delamination Wear Mechanism in Gray Cast Irons

An investigation of the friction and sliding wear of gray cast iron against chromium plated cast irons was carried out on a newly constructed reciprocating friction and wear tester. The tests were the first to be done on the test rig under dry conditions and at the speed of 170 cm/min, and variable loads of 20-260 N for a duration of 15 min. to 3 hours. The gray cast iron surfaces worn by a pro...

A Nematic LCD with Submillisecond Gray-to-gray Response Time

We propose a triode structure for achieving submillisecond grayto-gray response time in a double fringing-field-switching (DFFS) cell. The bright and dark states are obtained by applying a fringing field and a vertical field, respectively. The simulated averaged grayscale rise time is 793 μs and decay time is 478 μs. This triode DFFS mode enables conventional nematic LCDs for color sequential d...