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If the bubbles are below the threshold it is displayed to the user as microbubble activity. When a bubble equal to or greater than the threshold is detected an audio and visual alarm is generated and the arterial pump is stopped, this effectively terminates the cardiopulmonary bypass. The operator must identify and remove the bubble before ...
Notation: 1 – air inlet; 2 – cycling ribbon; 3 and 4 – beta radiation sources; D1 and D2 – beta radiation detectors; 5 – air pump; 6 – air exhaust. Beta attenuation monitoring ( BAM ) is an air monitoring technique employing the absorption of beta radiation by solid particles extracted from air flow.
Non-linear Junction Detector (NLJD): A portable NLJD allows the operator to search voids and areas where they are unable to gain physical or visual access, in order to detect electronic components and determine if the area is free from IEDs. Laser IED Detection: Scientists are learning to adapt lasers to detect, or defeat, IEDs. [19]
Aircraft, however, are the primary weapons in the ECM battle because they can "see" a larger patch of earth than a sea or land-based unit. When employed effectively, ECM can keep aircraft from being tracked by search radars, or targeted by surface-to-air missiles or air-to-air missiles. An aircraft ECM can take the form of an attachable ...
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In an ionisation type smoke detector, ambient air is allowed to freely enter the ionization chamber. The chamber contains a small amount of americium-241, which is an emitter of alpha particles which produce a constant ion current. If smoke enters the detector, it disrupts this current because ions strike smoke particles and are neutralized ...
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The Minnaert resonance [1] [2] [3] is a phenomenon associated with a gas bubble pulsating at its natural frequency in a liquid, neglecting the effects of surface tension and viscous attenuation. It is the frequency of the sound made by a drop of water from a tap falling in water underneath, trapping a bubble of air as it falls.