395,539 research outputs found

    Ignition means for monopropellant Patent

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    Catalyst bed ignition system for hydrazine propellant

    Improved ultrasonic biomedical measuring apparatus

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    Device for making measurements of organs in living specimens and recording movements of organs is described. System uses series of ultrasonic pulses beamed into body of animal and reflected echo pulses are picked up by transducers and recorded. Diagram of equipment required and method of application is included

    Hermetically sealed explosive release mechanism Patent

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    Hermetically sealed explosive release mechanism for actuator devic

    Metal detector system

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    Signal voltage resulting from the disturbance of an electromagnetic field within the volume of a sensitive area is compared with a reference ac voltage for polarity information, which identifies the material. System output amplitude and polarity indicate approximate size and type of metal, respectively

    Beyond the Pipeline: Getting the Principals We Need, Where They Are Needed Most

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    Analyzes the labor market for principals, pinpoints the extent and root causes of the problems some districts and schools are experiencing in attracting candidates, and indicates how policies and practices might better address those problems
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