Abstract: Disclosed is a liquid chromatography process for the quantitative determination of nitro-amines and nitro-aromatics in liquid samples, which comprises directly injecting a liquid sample containing these compounds onto a liquid chromatography column, separating the compounds on the column by elution, and then monitoring the ultra-violet absorbance of the resulting eluant. The instant process finds particular application in the quantitative detection of munitions, such as HMX, RDX, TNT, and their degradation products, in aqueous effluent streams.

Abstract: The relative roughness of a surface, finished with a plurality of uniform rallel grooves, is indicated in a method wherein (a) a focused beam of light is directed normal to the surface, (b) a light-sensitive device is disposed to one side of the beam to receive reflected light of the beam from the surface, (c) relative motion is provided between the beam and the surface, and (d) the energy of the reflected light received by the light-sensitive device is converted to a visual display whose amplitude is a function of the roughness of the surface.

Abstract: The frequency of a laser beam can be changed by directing the laser beam through a crystal that has paraelectric and ferroelectric states, above and below a Curie transition temperature, respectively. The crystal is maintained at a constant temperature slightly above its Curie transition temperature when no change in the frequency of the laser beam is desired; and a voltage is applied across the crystal to drive it from its paraelectric into its ferroelectric state when a relatively large change in the frequency of the laser beam is desired.

Abstract: A novel wind-tunnel simulator produces a flow of a gas over a spinning trr projectile to simulate the flame shape from the tracer projectile as though in actual flight. The wind-tunnel simulator comprises a fixture formed with an opening for receiving the tracer projectile therein spaced from the surface that defines the opening. The fixture is fixed to a motor which is coupled to the projectile for spinning it as though in actual flight. Gas is forced through passageways, formed in the fixture, that communicate with the opening, whereby the gas can flow over the spinning, burning, tracer projectile to simulate in-flight conditions.

Abstract: A fire control system for aiming a cantilevered adjustably mounted gun indes a flat muzzle mirror fixed to the muzzle of the gun. A light source, disposed within a gunner's periscope, directs a beam of light onto a movable mirror, in the periscope, which reflects the beam normal to the muzzle mirror only in the absence of gun to periscope positioning errors for all positions of the gun. The reflected beam from the muzzle mirror impinges on a charge coupled detector matrix array; and, depending upon the portion of the array impinged upon, provides compensatory azimuth and elevational error signals which are algebraically added to azimuth and elevational range signals produced by a ballistic computer in response to a range finder sighted on a target. The compensated azimuth and elevational signals are employed to position a movable reticle correctly in the periscope to enable the gunner to aim the gun accurately, whereby to increase the first round hit probability.