Abstract: Skywave propagation of quasi-sinusoidal signal sources generally results in multiple discrete Doppler shifts which can be associated with actual ionospheric modes in existence between the transmitter and receiver terminals at the operating frequency. The invention covers the application of monopulse direction finding techniques through the isolation of energy in each Doppler shifted mode through the use of high resolution spectrum analysis. More particularly, azimuth information is obtained by using the amplitude and/or phase responses of two antennae beams preferably in a monopulse configuration for each Doppler shifted mode.

Abstract: A cardiac output monitor. The monitor receives signals representing radial arterial pressure, balloon pressure, balloon drive and balloon volume from an intra-aortic balloon pumping system. These signals are processed to define balloon depletion pressure (P.sub.1), ventricle ejection pressure (P.sub.2), balloon volume (BV) and heart rate (HR). The monitor displays the cardiac output according toCardiac output = (P.sub.2 /P.sub.1) (BV) (HR)the monitor also indicates certain improper pumping system operations and can provide a continuous display.

Abstract: The invention is directed to the deposition of a coating on a substrate by reacting vaporized chemicals on contact with a heated surface to deposit a coating. According to the invention, the deposition surface is cleaned and coated in a single stage reactor. Means are also provided--where a boron deposit is wanted--to deposit an amorphous boron coating on the deposition surface.

Abstract: Working gas for an electron beam discharge laser is generated by an airbreathing, hydrocarbon fuel burning, turbocompressor engine and shaft power of the engine may be utilized to drive a generator to provide electric power to the laser or to drive a compressor to put the turbocompressor exhaust gases in compressed storage for later use in the laser, either mode affording savings in weight and cost of operating materials and/or specific energy conversion efficiency compared to prior art, electric, chemical and gas dynamic laser systems.

Abstract: A method of producing a lasable gaseous mixture for use in and operation of electron beam-sustainer carbon dioxide lasers comprising burning a hydrocarbon fuel to produce substantially oxygen free products of combustion, removing undesirable constituents to leave a gaseous mixture which can support laser oscillation comprising substantially only carbon dioxide, nitrogen and hydrogen, collecting the resulting gaseous mixture, and thereafter supply and use it as the active medium in an electron beam-sustainer laser.

Abstract: A two chamber electrically pumped electron beam stabilized gas discharge laser is enabled to operate at lower electron accelerating voltages for given power applications through provision of very thin separating diaphragms. The apparatus is controlled throughout initial pump down, laser gas filling, laser operation and air release phases to prevent occurrence of a diaphragm rupturing pressure differential between the two chambers or the inadvertent malsequencing of chamber evacuation and backfill.

Abstract: A gas turbine engine air inlet having an improved separator for particulate matter is described. Liner means define an annular flow passage which curves inwardly to the entrance of the engine's compressor. Hollow struts extend radially through the curved portion of the air passage. A V-shaped trap provides particle receiving pocket portions which span adjacent struts and open into first chambers in the struts. A plate extends downstream of the upstream edge of the inner trap leg to define a narrow entrance to the pocket portions. The upstream edge of the inner trap leg is spaced inwardly of the inner liner means at the entrance portion to capture most, if not all, of the particulate matter entrained in the inner portion of the air stream. The outer liner means comprise first and second liners, with the latter having its upstream edge radially inward of the upstream edge of the outer trap leg and intermediate its length.

Abstract: A miniature flat spray nozzle is disclosed which delivers a fan-shaped mist of fuel to a gas turbine combustor from a narrow slot. The slot is formed by making a transverse cut in a fuel-carrying conduit at a location near its end. A specially formed part is inserted into the end of the conduit which, in addition to capping off the conduit, divides the space adjacent thereto into three small chambers. One chamber is immediately below the transverse slot. Four orifices in the bottom wall of this first chamber connect it with the other two chambers. Each of the lower chambers opens into the conduit at its upstream end. Fuel delivered down the conduit divides in two parts, passes through the orifices between the lower and upper chambers, undergoes turbulent mixing in the chamber adjacent the transverse slot, and issues forth from the slot as an atomized mist.

Abstract: A negative torque sensing and control system is disclosed which is useful with a differential geared or fixed shaft gas turbine engine of the type installed in general aviation aircraft. Negative torque is sensed in the gear train between the propeller and the aircraft engine whenever there is a powerplant failure. When the reverse torque exceeds a selected threshold, hydraulic valves are actuated which remove oil pressure from the pitch control mechanism of the propeller. Loss of oil pressure causes the propeller to assume the feathered position.

Abstract: The invention is directed to a pyrophoric flare comprising a normally closed container containing a pyrophoric substance. A perforated cylinder may be immersed in the pyrophoric substance to meter the flow of the pyrophoric substance into the atmosphere. The container is configured to completely or partially fragment when activated to release the pyrophoric substance into the atmosphere.

Abstract: Apparatus is described which enables close tolerance electro-chemical milling of the leading and trailing edges of blades used in gas turbine engines. Using turbine blades formed with the edges slightly oversize in the as-cast condition, electro-chemical milling is used to properly shape the leading and trailing edges. The apparatus comprises an insulated body having a slot shaped to accept the turbine blade. The two outer edges of the slot are fitted with lengthwise slotted metallic tubing which receives the edges of a blade and which forms a channel for a supply of electrolyte for milling the blade edges. Means are provided for accurately positioning the blade within the body.

Abstract: A particle separator for separating and removing foreign particles from engine inlet air incorporates a plurality of identical channel assemblies. The channel assemblies are arranged in side-by-side fashion in a defined panel area. Separation is achieved by accelerating the particles to a high velocity and bending the airstream such that the particle inertia carries the particles into a capture area. A small percentage of the incoming air is used to induce particulate matter to proceed into the capture area. By use of a turbulence generator particulates are kept in suspension in the capture area to enable easy exhaustion overboard.

Abstract: A carbon ring seal for a shaft rotating at high speed is capable of preventing high temperature, high pressure gas from entering the oil system. The carbon seal is constructed so that at ambient temperature it works as a controlled gap seal, but when the seal runner reaches its full thermal growth the seal then functions as a positive contact seal. The carbon seal ring is retained by an anti-rotation pin extending through a slot in the ring. The carbon ring has a single fracture at the slot. The seal housing is provided with a plurality of calibrated holes for predetermined internal pressurization and cooling.

Abstract: A process of cutting thick metal workpieces wherein a cutting laser beam is inclined back from a cutting direction and oscillated in a direction parallel with the cutting direction while a gas jet is directed from above the workpiece at an angle approximately normal to the direction of the laser beam incident on the workpiece to blow away the laser melted material as it is produced.

Abstract: A diffuser is disclosed which provides intersecting passages extending outwardly from an inner circumference which closely surrounds the periphery of the impeller output stage of a centrifugal compressor. The passages are of curvilinear cross-section having entrance throat regions of an eccentric configuration designed to minimize the build-up of shock waves in the fluid flowing from the outlet of an impeller whose blade tips are traveling at supersonic speed. The configuration of the throat region is such that it closely matches the velocity vector profiles of fluid particles which leave the central region of an impeller blade at supersonic velocities and an appreciable angle above the tangential whereas particles leaving near the front and back shrouds of the impeller travel slower at angles approaching the tangential.

Abstract: A diffuser for use with a centrifugal compressor utilizes a symmetric arrangement of vanes which direct the gas flow along a plurality of passageways that are substantially tangential to the outer periphery of the impeller. Each vane making up the array is pivotally mounted near its opposite ends. Controls are provided so that rotation of the vane assembly about the innermost set of pivot points will vary the cross-sectional area of the ducts formed between adjacent vane members. This allows efficiency of the diffuser-compressor combination to be maximized for a multiplicity of speed and load conditions.

Abstract: An electrothermal reactor is provided to control the decomposition of chemical compounds and mixes and generate a gas flow. The reactor embodies a reaction chamber which has an electrical heat source. Means are provided to inject the chemical compounds and mixes into the chamber such that the compounds will vaporize. The heat source raises the temperature within the chamber to the reaction temperature wherein the chemical compounds and mixes react, thereby releasing chemical energy and producing a gas flow of the reaction products.

Abstract: Three-dimensional impregnated filamentary materials and methods for making the same.

Abstract: The present invention is directed to an improved cutting tool blank formed by hot pressing a mixture of finely divided high-purity alumina and from about 0.05% to 0.35% of magnesia. Up to 0.10% nickel oxide may be present. The hot pressing temperatures are effected at a temperature in the range of about 1300.degree.C to 1525.degree.C so that the crystal size of the alumina in the tool blank has an average size range from 1 to 2 microns and the pressed blank has a final product density in excess of 3.97 grams per cubic centimeter. The preferred density of the blank is in excess of 3.98 grams per cubic centimeter. The hot pressing is conducted under vacuum conditions.

Abstract: The flexible mechanical coupling herein shown comprises a drive member, flange and internally notched barrel in rigid relationship. The flange is a part of a helically formed coil-like torsion spring. An externally toothed sleeve is in concentric relationship to the barrel with its teeth in loose engagement with the notches. The driven element and the sleeve and the end of the torsion spring remote from the flanged end are secured in rigid relationship. The reservoir within the barrel is filled with viscous damping fluid.