Abstract: A quickly demountable security-conscious door having a four-pin engagement with the adjacent door frame and having a plurality of rack and pinion mechanisms for movement of the hinge pin and lock bolt members into engagement positions with respective receptacles located in the door frame member. The door includes weather stripping provisions, operating knob rotational limits, and operating shaft spring assistance and uses Teflon.RTM. or other low-friction materials in appropriate frictional engagement positions.

Abstract: A non-destructive inspection arrangement for ferrous and non-ferrous metallic workpieces. The inspection arrangement employs a liquid crystal indicator medium and electrical current flow through the workpiece to develop potential differences across work surface flaws that are to be detected. The concepts of direct application of the liquid crystal medium to the work area surface and containment of the liquid cyrstal medium within a viewing device are also included.

Abstract: An optical radiant energy source capable of far infrared spectrum operation and on-off energy modulation without interruption of the radiation sources operating temperature characteristics. Provisions for radiant energy dissipation as part of the modulation, for achieving uniform output beam dispersion over a specified area, and for airframe mounting of the disclosed apparatus are also included.

Abstract: An arrangement for testing substrate material intended for use in surface acoustic wave devices such as delay lines; the arrangement includes a plurality of electrical and physical evaluations of the material in quantities suitable for a manufacturing environment. In one evaluation acoustic wave energy developed in a tooling jig mounted transducer is mechanically coupled to successive material samples and the resulting output waveforms compared to expected results while in other evaluations the polarized light indicia and chemical reagent determined properties of the material samples are considered.

Abstract: Protection apparatus for excluding undesirable noise from the eardrum and inner ear of a user. The disclosed apparatus includes an evacuated, transmission medium-free, cavity for attenuating the noise energy. Plural arrangements of the evacuated cavity between the eardrum and noise environ are included. Uses of the disclosed protection apparatus in several military and industrial applications are described, including applications wherein communication with the protection user is needed.

Abstract: A system for simulating the display of visual images by a matrix of liquid crystal cells or other matrix elements and providing flexibility in selecting display characteristics such as element size, active area ratio, and signal noise content. The display preferably employs a cathode ray tube and uses software signal processing.

Abstract: A bone biopsy arrangement especially suited for use in obtaining axial skeleton trephine samples from the spinal vertebra centrum of a living test specimen in a safe and rapid manner. The disclosed arrangement uses radiographic mapping, precise mechanical control of the trephine with an apparatus disclosed in detail, conventional trephine energizing and a test specimen such as a rhesus monkey. Improved quality plural samples from a single test subject that were heretofore considered too inaccessible and dangerous for practicality are achieved.

Abstract: An optical system limiting resolution determination arrangement employing sinusoidal intensity modulated bar pattern input stimuli including two sequences for determining the modulation transfer function (MTF) component of limiting resolution; one of these and the disclosed aerial image modulation (AIM) curve determination are based on sinusoidal intensity modulated bar patterns, while the other MTF determination uses a Heaviside edge function stimulus and a sinusoidally determined AIM curve. The disclosed limiting resolution is especially useful in the consideration of aerial image devices such as cameras.

Abstract: A tow/release mechanism or towplate usable inter alia for controlling the initiation of a parachute extraction sequence in a cargo carrying aircraft--including operation capability while loaded with forces in the range of 70,000 lbs. The disclosed mechanism includes in-floor mounting, magnetic "armed" indication, and high structural integrity. Low-friction bearings are excluded from the mechanism, while compatibility with existing equipment parachute links, and use of hydraulic actuation are included. The disclosed mechanism is incorporatable in plural locations in the rearward portion of an aircraft and usable with either high altitude parachute cargo extraction or low altitude parachute extraction systems (LAPES); a typical LAPES sequence is also disclosed.

Abstract: A lightweight, high energy density, secondary cell battery suited for use as a battery filter element in an electrical network, particularly in space mission hardware. A pseudo-bipolar cell configuration with simple, effective electrolyte sealing and low electrical impedance characteristics is included, along with a sequence for fabricating and assembling a preferred cell arrangement.

Abstract: A coherent-on-receive MTI radar receiver system for use with cooperative or non-cooperative radar transmitters of either the coherent or noncoherent, simple magnatron type and scanning antennas. The receiver includes coherent digital signal processing with provision for normalizing or compensating phase variations in the transmitter carrier pulses.

Abstract: A biomechanical feedback arrangement wherein a varying force tending to improve the neuromotor tracking response of a human subject, particularly in the presence of lateral or front-back G force fields, is added to the test subject input member of a feedback control system. Use of the biomechanical feedback in a high-performance aircraft and in a ground-based simulator apparatus is also disclosed, along with comparison results from simulator testing of human subjects.

Abstract: A solid fuel rocket burn rate control method wherein grain preheating energy is supplied to the grain region just ahead of the regressing burn face by optical conductors such as fiber optic filaments that are buried in the grain and dispersed across the grain cross section. The optical conductors receive optical energy from one of several types of electrical-to-optical energy transducers such as a semiconductor laser or an incandescent source; the optical conductors promote coning burn action at the burn face of the rocket and allow control of the burn rate by electrically modified optical signals.

Abstract: A plated through-hole conductor structure for a multiple layer laminate electronic printed wiring board includes mechanical locking of the plated through conductor with textured conductor surfaces together with use of etching or other processing to provide laminate internal space for the mechanical locking structure. A manufacturing sequence and plural material selections are also disclosed.

Abstract: Wafer probing apparatus especially adapted to probing surface acoustic wave (SAW) device die such as delay lines is disclosed; the apparatus includes a probe card especially suited to the radio frequency and multiple output nature of a SAW delay line together with a computer-aided electronic system for exciting the delay line and evaluating its output.

Abstract: A G-force acceleration measuring instrument for use in an aircraft, spacecraft, submarine, or other vehicle, and employing electronic sensing and display transducers for increased reliability, small size, and small mass. The instrument includes a bar graph display, preferably incorporating liquid crystal transducer elements, uses a solid state or limited motion acceleration transducer, and provides graphic and numeric indication of the present G-force value together with numeric indication of historic maximum and minimum G-force values. The instrument also includes gain adjustment arrangements for accommodating different instrument panel slopes mounting in different types of vehicles with different G force capability, and a signal output tap for recording or slave indicating or telemetry or feedback use.

Abstract: A G force acceleration effects monitoring apparatus involving a pair of LED or other visual stimulus arrays, one randomly patterned by an electronic driving apparatus and one patterned by the manipulation of a G force test subject. The electronic driving apparatus preferably includes a sum of sines algorithm and the test subject manipulations are received preferably from a joystick controller. Mounting of the apparatus in a centrifuge gondola and also in off-line training stations and use of the invention by animals are also disclosed.

Abstract: Multiaperture fly's eye optical signal transducing apparatus employing nonlinear electrical signal processing located adjacent the optical transducers in a multifunction integrated circuit device. The processed signals have enhanced low-level contrast and attenuated high contrast. Utilization examples, mathematical equations and related characteristic curves are also included along with exemplary circuit diagrams.

Abstract: A charge coupled device gate electrode bus driving arrangement which uses the properties of an electrical transmission line to achieve higher impedance, essentially reactive free, loading of the bus driver circuit is disclosed. The described arrangement includes the addition of inductance elements, resistive terminations, constant gate capacitance compensation, and delay line considered placement of the CCD cells to the usual CCD configuration; the disclosure includes numeric examples of the impedances and delay times achieved.

Abstract: An image layout arrangement suitable for transposing small template located images into large work surface located images with any required degree of image resolution and detail, using simple, low-cost tools. An exemplary layout of aircraft images to a runway surface for use in enhancing air base survivability is included and employs point-by-point image transposition according to a plurality of point locating arrangements.