Impulse (physics)

About: Impulse (physics) is a research topic. Over the lifetime, 12776 publications have been published within this topic receiving 130894 citations. The topic is also known as: Imp.

Effects of a simulated blast pulse train on a simple neural model

Abstract: In the treatment of traumatic brain injury (TBI) due to blast‐wave exposure, an understanding of the mechanisms of injury is critical for proper intervention One mechanism of particular importance is the interaction of blast waves with neurons In order to investigate this interaction in isolation from other TBI mechanisms, blast waves were simulated on a local (approximately 1‐mm) scale using high‐intensity focused ultrasound (HIFU) The acoustic impulse of the HIFU blast wave was selected to approximate the impulse of an actual blast As a first step in a chain of increasingly complex neural models, the giant axon in an earthworm was used in this study Intact earthworms were exposed to simulated blast waves from an HIFU transducer, and axonal action potentials were stimulated and recorded The action potential amplitude decreased continuously with increasing impulse, with the signal typically vanishing at about 8000 Pa s The conduction velocity showed more of a threshold effect, decreasing minimally from control values until an impulse of about 4000 Pa s was reached, at which point the decline was more rapid Results indicate that exposing isolated neurons to HIFU‐simulated blasts is a promising approach for studying TBI

Firing evaluation device

Abstract: PURPOSE:To compute the transit point of a bullet accurately even if there is a wind, by correcting the coordinate of the transit point of the shoot bullet according to output data from an anemoscope and anemometer set near a pressure sensor CONSTITUTION:A position arithmetic unit 5 computes the position of a point in the transit course of a bullet by using previously calculated propagation speed of fire impulse waves, the reach time difference of sound pressure signals 1-3 of fire impulse waves calculated with a reach time difference arithmetic unit 4 and the known coordinate of disposition of a pressure sensor, and determines the position of the point of projectile line on quadrants of a target At this time, when wind direction and speed signals 6, 7 are input into a position correction conditions deciding part 10, it is decided in which group of the previously classfied sixteen groups of wind according to wind direction and speed the wind belongs, signals corresponding to the names of the group and the quadrant of the target are input into a position correction conditions table part 11, and a corresponding coefficient is selected from stored impulse wave propagation velocity correction coefficients and input into a position correction arithmetic unit 12 to correct the position coordinate of the point in the transit course of the bullet computed with the unit 5