Abstract: A magnetic resonance imaging receiver system for producing high resolution images of the foot and ankle regions of a human subject. The magnetic resonance imaging receiver comprises an antenna for receiving resonance signals produced by a magnetic resonance imaging, radio frequency excitation magnetic apparatus, a free standing foot cradle assembly for supporting and rigidly holding the foot and ankle of the subject, and a tuning/impedance matching circuit for providing for the maximum transfer of radio frequency energy from the antenna to the receiver unit in the magnetic resonance imaging, radio frequency excitation magnet apparatus. The system utilizes fixed local coils which operate in the receive only mode for receiving electromagnetic signals from resonating nuclei produced by a whole body MRI scanner system or the like to produce high quality images.

Abstract: Scaled multiple function non-linear FM waveforms are generated for use in digitally implemented low frequency radar. The non-linear FM waveforms are generated by combining a plurality of functions, each having varying characteristics, to form a single waveform which has the desirable characteristics of weighted linear FM waveforms without the undesirable attributes due to weighting. Accordingly, the use of the non-linear FM waveform results in an increase in detection range of eight percent over existing linear FM waveforms with no degradation in range resolution.

Abstract: A segmented variable sweep wing for an aircraft has a plurality of wing segments. A structural device movably affixes the wing segments to the fuselage of the aircraft adjacent each other at their root areas. The structural device moves the segments conjointly to a power position where the segments are perpendicular to the fuselage and spaced from each other. The structural device also moves the segments conjointly to a cruise position wherein the segments are swept back at an angle with the fuselage and in abutment with each other thereby forming a unitary continuous surface airfoil.

Abstract: Each of at least two asynchronous generators connected to a common electrical load for uninterruptibility of the power supply is driven by a corresponding one of at least two drives in such a way that when any one of the generators is driven above synchronous speed by a slip fraction while its stator is electrically excited, its shaft mechanical power is converted to electrical output power at its output terminal. A control circuit is connected to the load, coupled to the output terminals of the generators and connected to the input terminals of the generators and provides an excitation voltage and controls the phase of the excitation voltage of each of the generators with respect to the load voltage. This controls the slip fraction of each of the generators loosely whereby load current from any source is completely controlled.

Abstract: An acoustic attenuating liner has a non-metallic honeycomb core bonded on a backsheet. A corrosion-insulated perforated sheet is bonded to the honeycomb core by adhesive between the perforated sheet and the core. The mesh is woven to a plurality of different determined weave patterns from material on and affixed to the perforated sheet, whereby the mesh has a plurality of different resistances. The mesh is aligned with the perforated sheet and is bonded to the perforated sheet by additional adhesive between the mesh and the perforated sheet, thereby providing a segmented liner with a plurality of facesheet resistances.

Abstract: A strip of alumina is thermally bonded to the under surface of an LED display by a thermally conductive adhesive. A thermally conductive front panel is placed in thermal contact surrounding the front surface of the display. A double sided, thermally conductive pressure-sensitive tape is used to bond a heatsink in thermal contact with the alumina. The heatsink is in thermal contact with the front panel and dissipates heat from the display via the alumina, the heatsink and the front panel.

Abstract: An adaptive power limiter circuit for suppressing power spikes output by a receiver to reduce the chances of damage to the receiver includes a first attenuating stage having an input terminal for receiving power spikes of input magnitude. A first FET is coupled to the input terminal and an output terminal is coupled to the first FET for providing power spikes of output magnitude which are diminished in power relative to the input magnitude. A second attenuating stage has an input terminal connected to the output terminal of the first attenuating stage for receiving the power spikes output by the first stage, an additional FET is coupled to the input terminal of the second stage and a second stage output terminal is coupled to the additional FET for providing power spikes of output magnitude which are considerably diminished in power relative to the input magnitude of the spikes at the input terminal of the first stage.

Abstract: An acoustic attenuating liner has a non-metallic honeycomb core bonded on a backsheet. A corrosion-insulated perforated sheet is bonded to the honeycomb core by adhesive between the perforated sheet and the core. A mesh woven form corrosion-resistant metal is bonded to the perforated sheet by additional adhesive between the mesh and the perforated sheet for bonding said mesh to said perforated sheet. The additional adhesive has predetermined characteristics including a minimum viscosity of 1000 poises during curing.

Abstract: An X-ray lithography optical system has an elongated concave scanning mirror spaced a first predetermined distance from a source of X-rays. The mirror has a reflecting surface of part toroidal configuration having a first radius of curvature coincident with that of a torus of which the mirror is part and spaced opposite first and second ends having a second radius of curvature, different from the first radius of curvature, coincident with that of the circle which generates the torus. A photoresist is spaced a second predetermined distance from the mirror and positioned to receive X-rays reflected by the mirror. The second predetermined distance is greater than the first predetermined distance. A mask in proximity with the photoresist permits a predetermined pattern of X-rays to impinge on the photoresist and blocks all other X-rays.

Abstract: A tilt wing VTOL aircraft has an upper wing with a leading edge, a trailing edge, an inboard area adjacent the fuselage, spaced opposite end tip areas and an upper surface. The wing is pivotally mounted on the fuselage for rotation from a cruise position in which the upper surface of the wing is flush with the upper surface of the fuselage to a hover position in which the wing is perpendicular to the upper surface of the fuselage. The wing has a forward portion in the leading edge of the inboard area affixed to the fuselage and cut out of the wing and an aft portion in the trailing edge of the inboard area affixed to the fuselage and cut out of the wing.

Abstract: A VTOL aircraft has a first engine nacelle mounted under the wing on one side of the fuselage and houses two of the aircraft engines. The first engine nacelle is mounted in close proximity with the fuselage. A second engine nacelle is mounted under the wing on the opposite side of the fuselage from the first nacelle and houses the remaining two engines. The second engine nacelle is mounted in close proximity with the fuselage. The first and second nacelles are movable from positions parallel to the wing for normal flight to positions perpendicular to the wing for vertical flight. Each of the first and second engine nacelles has inlets and nozzles and each of the first and second nacelles is angled in a manner whereby its nozzles are closer to the fuselage than its inlets. First control vanes extend aft of the nozzles of, and are movable with, the first engine nacelle and second control vanes extend aft of the nozzles of, and are movable with, the second engine nacelle.

Abstract: An enclosure covers equipment to be camouflaged from thermal or multi-spectral (thermal, radar visual) detection in spaced relation with the equipment. The enclosure is preferably semi-transparent plastic material sufficiently spaced from the equipment to permit natural convection, or forced airflow over the equipment. In one embodiment, the plastic material has a number of sides with a plurality of openings formed therein for entraining air and a top joining the sides. A chimney is formed in the top and an adjustable discharge damper is provided in the chimney for controlling the flow of air over the equipment. The airflow may be natural or controlled actively or semi-actively.

Abstract: The central data processor of a radar system includes a plurality of Raytheon Company militarized VAX computer family model 860 super-minicomputers, each having a Raytheon Company MVCF-860 input/output expansion chassis and a Control Data corporation militarized disk system unit. A high speed, asynchronous, bidirectional communications channel provides a communications interface between a programmable signal processor and the super-minicomputers. A joint tactical information distibution system asynchronous, bidirectional communications channel interfaces a joint tactical information distribution system to the super-minicomputers. A plurality of militarized advanced disk system units and small computer systems interfaces of a digital display processor are interposed between one of the militarized advanced disk system units and the digital display processor. An operator work station local area network interfaces the digital display processor and the input/output expansion chassis of the central data processor.

Abstract: A tilt ramp swept edge nozzle for vectoring exhaust gases from an engine mounted in an aircraft has a pair of flaps pivotally affixed to the aircraft in the area of the output end of the engine tailpipe. The flaps are in spaced relation to each other, aligned with the trailing edge of the airfoil of the aircraft and are movable to positions substantially parallel to each other and to positions substantially non-parallel to each other. An actuating system coupled to the flaps moves same relative to each other thereby to maintain a substantially constant effective throat area in the nozzle and providing an increasing nozzle aspect ratio and variable thrust direction during transition from forward to aft throat position of the nozzle.

Abstract: A heating system has a substantially cylindrical hollow muffle formed of a alumina ceramic with a plurality of heat-generating windings therearound. A light-actuated power control is operatively connected to the windings. A computer is operatively connected to a temperature monitor associated with an article being heated in the muffle. The computer is also operatively connected to a light-signal generator and provides commands to the generator in the form of a train of equidistantly spaced electrical pulses in response to temperature measurements provided by the monitor such that an article can be heated to an elevated steady state temperature and controlled at that steady state temperature within precise predetermined limits. The precise temperature control makes the system particularly valuable in the fabrication of crystals with uniform properties or having special growth requirements.

Abstract: The invention features an optical spread spectrum decoder wherein linear, non-linear, and discontinuous broadband RF signals can be optically decoded.The system introduces a weighting function into a local oscillator beam, which is then combined with a laser beam which has been modulated with the RF signal, processed to remove unwanted spectral components and then compressed. The combined beams are then down-converted to recover the RF signal.

Abstract: The gust alleviation system was designed to be an add-on to any existing g-command flight control system. The system assumes that there already exists, a stability augmentation system which will hold the aircraft's attitude. This system minimizes the interaction of the gust alleviation system with the existing flight control system. The gust alleviation system picks off the stick displacement signal and the aircraft normal acceleration sensor signal and processes this information. The outputs of the gust alleviation system are added back respectively to the existing flap command signal and the aircraft's original stability augmentation loop.

Abstract: A seat with integral three point user restraint which has a seat and a three point restraint system for restraining the user to the seat, the three point restraint system is mounted entirely and directly to the seat, the seat and the three point restraint system together form a self contained integral unit so that the seat is adaptable to different installations without relocating the three point restraint system.

Abstract: The invention features an optical system for removing electromagnetic interference components from a radio frequency signal. The radio frequency signal is electrically cascaded through a series of multiple channels each having a common pathway. The final RF output of the system produces a notched signal whose notch depth is the cumulative depth of each channel notch depth.

Abstract: The invention features a universal harness board for wiring harnesses of different configurations. The board is of box-like construction. A plurality of pins are disposed inside the board. The pins are spring biased to extend above the work surface of the board. Each pin has a locking mechanism to hold it in a retracted position until a plunger is depressed to release it to its extended position. The release of certain ones of the pins will provide the desired wiring pattern.