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In this case, the gas ahead of the shock is stationary (in the laboratory frame) and the gas behind the shock can be supersonic in the laboratory frame. The shock propagates with a wavefront which is normal (at right angles) to the direction of flow. The speed of the shock is a function of the original pressure ratio between the two bodies of gas.
An oblique shock at the nose of a T-38 aircraft is made visible through Schlieren photography. An oblique shock wave is a shock wave that, unlike a normal shock, is inclined with respect to the direction of incoming air. It occurs when a supersonic flow encounters a corner that effectively turns the flow into itself and compresses. [1]
Consumer Reports has helped start several consumer groups and publications, in 1960 helping create global consumer group Consumers International and in 1974 providing financial assistance to Consumers' Checkbook which is considered akin to Consumer Reports for local services in the seven metropolitan areas they serve.
Shock testing typically falls into two categories, classical shock testing and pyroshock or ballistic shock testing. Classical shock testing consists of the following shock impulses: half sine, haversine, sawtooth wave, and trapezoid. Pyroshock and ballistic shock tests are specialized and are not considered classical shocks.
It occurs when a supersonic flow encounters a body, around which the necessary deviation angle of the flow is higher than the maximum achievable deviation angle for an attached oblique shock (see detachment criterion [1]). Then, the oblique shock transforms in a curved detached shock wave. As bow shocks occur for high flow deflection angles ...
More advanced supersonic intakes feature a ramp with a number of discrete changes of gradient in order to generate multiple oblique shock waves. The first known aircraft to use this is the North American A-5 Vigilante with fully-variable wedge-type side air intakes [ 3 ] In the case of Concorde , the first (converging) intake ramp is followed ...
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GHB has biphasic effects, a euphoric effect at low doses (the reason for the term liquid ecstasy), and a sedative effect [38] at higher doses. As a result of this sedation it can cause unconsciousness. [39] When combined with alcohol the increased sedation and risk of vomiting results in a high risk of fatality. Many harm reduction ...
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