Abstract: An intrusion detector is configured to transmit signal(s) of a very short ration and then process the returned signal(s) reflected from various surfaces and objects within the propagation path in a room to be secured. The return signal(s) is a succession of peaks whose return times represent the location of respective objects. As configured, the intrusion detector apparatus includes, inter alia, a microprocessor that stores processed facsimiles of the return signal(s) for an unoccupied room and continually makes comparisons with subsequent returned signal(s). When the returned signal(s) changes, as a result of an unauthorized entry into the room, for example, a visual and/or audible alarm indication is produced.

Abstract: An apparatus for and a method of controlling multiple time varying proces by a central control device through a use of an adaptive data acquisition scheme is disclosed. A state estimator is used to extrapolate the current state of each control process as well as an estimate of the uncertainty of each state estimate. The state whose uncertainty is greatest is selected. The selected process is then measured, estimated, and a control variable calculated. Use of this selection criteria allows a single control device to effectively control more time varying processes then if the controls had been determined by a controller using a fixed sampling rate. Statistics for each process are updated with each measurement in order to compensate for the time/varying nature of the processes.

Abstract: A 360.degree. IFF video resynchronizer unit for storing pertinent data such s the range, the code, the IFF mode and the azimuth for each reply from associated transponders is disclosed. The 360.degree. IFF video resynchronizer unit is also configured for interfacing with one of a plurality of interrogator subsystems associated with a plurality of radar systems having multiple antennas so as to backup any one of the plurality of interrogator subsystems with a single 360.degree. IFF video resynchronizer unit. In addition, any number of the plurality of interrogator subsystems can be replaced with a single 360.degree. IFF video resynchronizer unit when at least one of the plurality of interrogator subsystems is present.

Abstract: A converter, according to the present invention, operates to convert pertnt IFF data which is in a digital format to an IFF composite video format. The converter is configured to interface with conventional plan-position indicators (PPIs) and decoders.

Abstract: The present invention relates to a high output programmable current source. omplementary output stages are connected between appropriate power supply polarities for driving a low impedance load which is connected to circuit ground. An operational amplifier is connected between the input and emitter of each of the complementary stages providing negative feedback for virtually eliminating the input offset voltage of the respective output stage. A programmable function signal source is connected to the operational amplifiers for driving a programmable signal current to the extent possible through the load resistance from a limited voltage supply.

Abstract: The present invention relates to an X-ray spectrometer for obtaining EXAFS data from a target material. The target material is exposed to incident pulsed synchrotron/X-ray radiation having a selected range of continuous spectrum and intensity suitable for obtaining EXAFS data from the material. The transmitted or fluorescence X-rays is detected and integrated over a period of time. The integrator is controlled by a gate synchronous with the pulsed radiation. The integration time of the integrator can be varied. A xenon flash is provided for exciting appropriate materials and is controlled by a gating device which is also synchronized with the radiation pulses.

Abstract: A torque gauge using magnetoelastic ribbons is presented wherein changes in the magnetic characteristics of these ribbons are detectable in a push-pull mode for determining torque forces applied to the ribbons. Respective tensile and compressive forces applied to the ribbons cause a change in the magnetic qualities of the ribbons and of the inductance of coils wound about the ribbons with the change of inductance being a measure of the torque forces applied to the input of the device.

Abstract: A broadband multi-element antenna is presented. The antenna comprises a monopole centrally disposed within a cavity of the body, and a plurality of antenna elements disposed at ninety degree increments about the periphery of the cavity. A plurality of isolation traps are connected between selected pairs of the antenna elements. The isolation traps are half-wavelength transmission lines which permit excitation of the respective plurality of elements by input signals which are of equal amplitude and 180.degree. out-of-phase but are short circuits between the respective pairs for in phase signals parasitically induced from the monopole. Additionally, switching traps are connected to respective ones of the antenna elements. The switching traps comprise quarter-wave transmission lines which are switchable to ground and selectively provide a short circuit of signals at the respective ones of the elements for changing the radiation pattern of the antenna.

Abstract: Prefabricated dental crowns which do not require precision fitting are prnted. In one embodiment, the crown is secured to a preparatory foundation disposed upon a tooth. In a second embodiment, a ring-like crown body is secured to the tooth by a filler material and a crown overlay having an occlusal portion is matingly fitted and secured to the crown body.

Abstract: A shaped charge and method of breaching reinforced masonary walls is disced. The shaped charge includes an annular liner located centrally between the ends of a cylindrical container filled with explosive. The device is placed in a pilot hole in the wall and is detonated simultaneously at the ends. The charge creates an annular radially expanding jet of explosive gases and fragments directed into the wall providing a man size opening therein.

Abstract: The microstructural stability of nickel base alloys at high temperatures is nhanced by the addition of cobalt within the range of 10.0 to 14.9 weight percent for reducing the precipitation of the sigma phase in alloys with more than 12 weight percent chromium. The nickel-base alloys having cobalt addition in the range as set forth are characterized by an electron vacancy number within the range of 2.4 to 2.7 inclusive.

Abstract: A dental inset for cooperative retainment about a tooth of an external max band by a retainer is presented. The matrix band is provided with oppositely disposed end portions and the inset connects the end portions of the matrix band where the end portions divaricate from the tooth so that a 360 degree matrix which readily adapts to the cervical circumference of the molar teeth is provided.

Abstract: Dynamic skew correction of multichannel analog information is presented. A arrier frequency signal is amplitude modulated by a lower frequency modulation signal derived from a common source and having predetermined zero crossing and phase characteristics. The amplitude modulated carrier signal is recorded on at least two of a plurality of channels simultaneously with recording on the respective channels of the analog information. Upon playback, the various modulated signals are derived from the plurality of channels simultaneously with the playback analog information recorded on the respective channels. The predetermined characteristics of the derived carrier and lower frequency modulation signals are used for processing the played back information for time displacing the information derived from the individual channels for correcting skew errors between the various channels.

Abstract: An aerodynamic rotor having a flexible blade comprising a plurality of planar layers and an anvil having configured bearing areas engagable with the flexed blade is presented. The plurality of layers are slidably movable in a shearing motion with respect to other layers. The blade is secured by the anvil with the configured bearing areas being engagable with an adjacent portion of the blade when the blade is flexed by forces created by the driven rotory motion of the anvil about an axis of rotation. Such a rotor with a laminated blade exhibits reduced head moment forces and reduced stress/strain forces within the blade thereby permitting improved reliability and maintenance.

Abstract: The present invention relates to apparatus and method for reducing the vil perception of flicker on the optical display having interlaced raster fields. A gram of data is divided into a plurality of designated even and odd alternate pixels. The even pixels are displayed during a line of one of the raster fields and the alternate odd pixels are displayed during an adjacent line of the other interlaced raster field.

Abstract: The present invention relates to a launch mechanism for launching a store from a vehicle such as an aircraft. The store is stored in a controlled manner close to the body of the aircraft and, in preparation for launch, is displaced in an arcuate or circular trajectory away from the vehicle by a swing arm pivotally constrained to the vehicle. A release mechanism is provided at the distal end of the swing arm for controlled securement and release of the store.

Abstract: An optical fiber cable and magnetic field detector magnetostrictively reave to the presence of an external magnetic field is presented, and methods thereof. The optical fiber cable comprises a elongated optically transparent core sheathed by a magnetostrictively responsive jacket disposed about the periphery of the core. The jacket responds to magnetic fields present and strains the core effecting the light transmission of the core. The effect upon the light transmission by the jacket is detected by interferometry for determining the presence of the magnetic field.

Abstract: A test apparatus for determining the operable condition of fuel level conl valves is presented. A sensor is connected to a fuel line for delivery of a test sample of fuel through the fuel line to a receiving system from a fuel supply source. At least one valve is disposed in the fuel line between the sensor and the fuel receiving system. A plurality of sense lines is connected from the sensor to a flow indicator and a pressure indicator such that simultaneous indication of the visual flow indicator and the visual pressure indicator within respective predetermined limits upon a delivery of the test sample of the fuel prior to delivery of the fuel through the fuel line indicates that the fuel level control valve is not properly operable.

Abstract: Gold based contact materials fabricated by directional solidification and hibiting increased strength, hardness, wear resistance and undegraded electrical conductivity, are presented. An eutectic structure comprises a matrix metal consisting essentially of gold and a second phase rich in an alloying material. The second phase rich in an alloying material is disposed within the matrix metal in a plurality of elongated zones formed by directional solidification of the alloy with each zone having an elongated axis generally normal to a contact boundary surface of the solid. The second phase is rich in an alloying material selected from a group of alloying elements consisting of Be, Ca, Sr, La, Na, Th, Zr, Hf, Sb, Ge, Mo, Si and the rare earth elements. Selected ones of the alloying elements can be subjected to internal oxidation for forming hard, oxide particles of the second phase material.

Abstract: An electronic phase shifter for shifting the phase of a sine wave at an input terminal, as measured at an output terminal, without affecting the magnitude thereof and having the ability to operate over a wide range of input voltages is disclosed. The electronic phase shifter comprises, inter alia, an operational amplifier and a unique variable output resistance device. A control signal, in the form of a current, for controlling the phase shift of the sine wave is applied to the input of the variable output resistance device. Buffering of the electronic phase shifter from preceding stages is controlled by matched resistors operatively connected between its output and input terminals and the inverting input terminal of the operational amplifier. The operating frequency range of the electronic phase shifter, and, accordingly, the phase shift range, is controlled by a capacitor connected from its input terminal to the non-inverting input terminal of the operational amplifier.