Abstract: Provided is a test fixture for testing sonar transducer isolation rings. The fixture includes a stand, a pair of interchangeable isolation ring mounting bases, a mounting post, an actuator mounting bracket, a linear actuator, an actuator controller, a pair of weight alignment shafts, a weight, and an electrical test unit comprising a positive and a negative test lead. An Isolation Ring can be placed on the base for electrical and mechanical testing in order to detect dimensional tolerances and for voids or other area of insulating weakness caused during manufacturing. Additionally, the weight reduces strain and risk of injury to the operator while providing a repeatable pressure on the Isolation Rings during testing. The precise locating provided by the weight shafts and dowel pin eliminates operator error and accurately and consistently locates mating parts.

Abstract: Provided is a test fixture for testing sonar transducer isolation rings. The fixture includes a stand, a pair of interchangeable isolation ring mounting bases, a mounting post, an actuator mounting bracket, a linear actuator, an actuator controller, a pair of weight alignment shafts, a weight, and an electrical test unit comprising a positive and a negative test lead. An Isolation Ring can be placed on the base for electrical and mechanical testing in order to detect dimensional tolerances and for voids or other area of insulating weakness caused during manufacturing. Additionally, the weight reduces strain and risk of injury to the operator while providing a repeatable pressure on the Isolation Rings during testing. The precise locating provided by the weight shafts and dowel pin eliminates operator error and accurately and consistently locates mating parts.

Abstract: A method and system for transmitting and receiving a data stream using a phase or frequency modulated audio signal wherein an audio signal is modulated in at least one of phase and frequency according to the data stream and wherein the modulated audio signal is outside the range of human hearing. The modulated audio signal is combined with an audio program into a composite signal that is used to modulate a carrier. In order to receive the data easily, the audio program is filtered to accommodate the modulated audio signal. During reception, the gain of a detector is controlled by the power level of the recovered data-modulated audio signal. Recovery of the data-modulated audio stream is accomplished by first recovering the composite signal from the modulated carrier and attenuating the audio program so as to isolate the data-modulated audio signal. The isolated data-modulated audio signal is then again demodulated to recover the transmitted data.

Abstract: Provided are mono- and diimide naphthalene compounds for use in the fabrication of various device structures. In some embodiments, the naphthalene core of these compounds are mono-, di-, or tetra-substituted with cyano group(s) or other electron-withdrawing substituents or moieties. Such mono- and diimide naphthalene compounds also can be optionally N-substituted.

Abstract: Mono- and diimide perylene and naphthalene compounds, N- and core-substituted with electron-withdrawing groups, for use in the fabrication of various device structures.

Abstract: A process for fabricating magnetic bubble domain devices having multiple layers. The process is a single high resolution mask process. A magnetizable layer, a conductive layer and at least one dielectric spacer layer are provided on a suitable magnetic bubble domain material and etched in a suitable manner such as by ion milling. The material layers may be applied such that the conductive layer is applied first and the magnetizable layer applied thereafter or vice versa.

Abstract: An actinic radiation emissive mask for a high resolution lithography emits actinic radiation which originates within the mask. The mask patterns the actinic radiation to expose resist in accordance with a desired pattern. The actinic radiation originating in the mask may be produced by radioactivity, stimulated emission or combinations thereof.

Abstract: A method of producing light emitting diodes of high quantum efficiency in mass production by utilizing an epitaxial deposition from a small size melt such that the substrate itself serves as a saturation source. A silicon doped gallium arsenide wafer is cleaned and etched by normal means and subsequently the wafer is precoated with a properly doped gallium master melt. The coated wafers are inserted into an epitaxial furnace and the gallium master melt effects solution of a portion of the gallium arsenide monocrystal substrate and finally the entire wafer is cooled, maintaining a temperature gradient causing epitaxial growth on the substrate.