Abstract: A differential property sensitive acoustic lens for non-destructive materials evaluation is described which in a preferred embodiment comprises first and second substantially semicylindrical shaped portions of fused silica disposed in closely spaced relationship along an axial plane, a substantially spherical depression defined in one end of each semicylindrical portion and a flat defined on each semicylindrical portion at the other end, a piezoelectric transducer attached to the flat of each semicylindrical portion, and a paraffin coated aluminum film of preselected thickness disposed between and in laminar contact with the semicylindrical portions for preventing acoustic and electrical cross talk between the transducers and between the semicylindrical portions.
Type:
Grant
Filed:
January 6, 2000
Date of Patent:
October 1, 2002
Assignee:
The United States of America as represented by the Secretary
of the Air Force
Inventors:
Shamachary Sathish, Mark J. Ruddell, Robert L. Crane
Abstract: Purified and substantially pure &bgr;-carrageenan and processes for their preparation. Purified &bgr;-carrageenan can be obtained from a marine macroalga containing &bgr;-carrageenan and/or a precursor thereof by the steps of:
A. where the macroalga contains a precursor of &bgr;-carrageenan, reacting the macroalga with an alkaline compound to convert the precursor to &bgr;-carrageenan,
B. extracting carrageenan from the macroalga,
C. treating the extracted carrageenan with an aqueous quaternary ammonium salt to form a precipitate and an aqueous solution,
D. separating the solution from the precipitate, and
E. isolating purified &bgr;-carrageenan from the solution.
Substantially pure &bgr;-carrageenan can be obtained from purified &bgr;-carrageenan by the further steps of:
F. forming a solution of purified &bgr;-carrageenan in water,
G. contacting the solution with an ion exchange agent that removes carrageenan which contains sulfate ester from the solution,
H.
Type:
Grant
Filed:
May 21, 1991
Date of Patent:
October 1, 2002
Assignee:
FMC Corporation
Inventors:
Gertrudes A. Santos, Donald W. Renn, Lisa E. Dumont, Charles A. Parent
Abstract: A distinct cultivar of Chrysanthemum plant named ‘Plus’, characterized by its decorative-type inflorescences that are about 7.5 cm in diameter; attractive white-colored inflorescences; response time about 58 days; dark green foliage; freely flowering habit; strong and thick stems; and excellent postproduction longevity with inflorescences maintaining good substance and color for about three weeks in an interior environment.