Abstract: A pulsed-transmission, narrow-band sonar system has a first antenna array ich is unshaded and a second array partitioned into four parts, the center two of which are electrically connected in parallel and the outer two of which are connected in series.

Abstract: A beamformer system is disclosed which includes an array of sensors such as ydrophones which produce signals from which information relating to a target is to be determined. The beamformer system includes a channel for each sensor, the channel including a varable length shift register which provides bulk delay to received signals, a FIR interpolation filter which provides vernier delay and shading. The system also includes a summation tree which adds the received signals and a sign extension/bit reversal filter to avoid authmetic overflow.

Abstract: A device for steering a null in a sonar beam pattern resolves first and snd beam signals into four quadrature components. These components are multiplied in multiplying digital to analog converters by binary number factors, derived in accordance with the desired null angle, to provide analog signals that are combined in a summing amplifier to provide analog output corresponding to acoustic energy received by a beam having a null at the desired angle.

Abstract: A unique system of disposition-controlled, water-filled, fabric bags is sended from and towed beneath a ship to effect the modification of the inherent water pressure signature thereof and thus prevent detonation of a marine mine programmed to be exploded thereby.

Abstract: An abstract is provided which is capable of clearing encased explosives s as land mines. This apparatus combines a shaped charge jet with a plate penetrator. A depression is formed in a column of a first explosive material. The depression is provided with a metal liner such that detonation of the first explosive material forms a shaped charge jet. The shaped charge jet passes through a hole in a plate penetrator and exits the device without detonating a second explosive material. The shaped charge jet strikes the ground and imparts kinetic energy. As the energy in the shaped charge jet is consumed, the second explosive material detonates and drives the plate penetrator to supersonic velocities. Since shaped charge jet velocity exceeds the detonation velocity of the second explosive material, the shaped charge jet clears a path ahead of the plate penetrator.

Abstract: A self-regulating apparatus for providing cooled air to multiple supplied r respirators users through a manifold automatically maintains the air supplied to the respirator users within a desired constant temperature and pressure range although the number of respirator users and the ambient temperature may vary. The apparatus includes a temperature regulator connected to a vortex tube to regulate the exhaust air exiting the vortex tube and a back pressure regulator connected to the manifold.

Abstract: A method for replacing a spool mount or other noise reducing device which located in a confined area. The tool for practicing the method includes both extraction elements and installation elements. The extraction elements include an extraction guide, an extraction stud, and an extraction rider. The installation elements include an extension guide, a compression guide, and an installation rider. The tool drastically reduces the time required for replacement of a spool mount and does not require any cutting or welding.

Abstract: A valve with an O-ring, a disk seal, and a replaceable valve seat. A groove n the bottom of the valve seat flange forms an inner and outer drip ledge with the inner and outer periphery of the flange. If leakage occurs at the valve seat O-ring, fluid droplets will form on the outer drip ledge. If leakage occurs at the disk seal, fluid droplets will form on the inner drip ledge. A visual inspection of these drip ledges through an access port, or by a borescope placed in an inspection port, can discriminate between a leak which originates in the O-ring and a leak which originates in the disk seal.

Abstract: Shipping container latch pins are installed utilizing apparatus including o pivotally interconnected working members having opposite endportions. Motive means in the form of a bolt member are carried by one endportion of one working member and are operative to move the associated endportions of the working members away from each other, thereby moving the opposite endportions toward each other to press a pivot pin into a latch. The opposite endportions are biased away from each other by a spring, and include opposed pairs of open-ended slots for receiving the ends of the pivot pin.

Abstract: Illuminating flare has an igniter in which a two-part inertial mass is gud for relative aftward movement from a safe position to an armed position under launching forces. One part of the mass undergoes relative forward movement to an ignition position under parachute-opening, deceleration forces while the other part of the mass is restrained from moving as far forward as the first part. This separation of the parts of the mass releases locking balls to unlock a firing pin, which stabs a primer and initiates ignition of the flare. The primer is contained in a rotor, and as the mass traverses from the safe position to the armed position it rotates and the rotor rotates with the mass. In the safe position the primer is out of communication with an ignition passage through which ignition of the illuminant composition occurs. Rotation of the rotor as the mass traverses to the armed position places the primer in communication with the ignition passage where it remains until activated by the firing pin.

Abstract: A surface examination assembly for examining surface contours by detecting nd recording surface contour data including profile data to determine the existence of variations of the surface from design specifications, and to determine the existence of structural degradation as indicated by surface contour changes includes a mounting frame for holding the assembly elements and for mounting the assembly on or near the surface to be examined, a probe arm adjustable mounted on the frame by means of a slide block, the slide block permitting movement of the probe arm in both a vertical and a horizontal position relative to the frame, a recording device for use with a recording medium mounted on the frame, the recording device being operatively engaged with the probe arm and moveable in response thereto to permit contour and profile data detected by the probe arm to be transmitted through the recording device to the recording medium.

Abstract: A test assembly for automatically testing and diagnosing digital printed-circuit boards has a driver circuit for supplying a stimulus pulse to the circuit board to be tested, a sensor circuit for detecting the output from the circuit board in response to the stimulus pulse, a program for directing the testing operation of the test assembly, an input device such as a keyboard for entering instructions including the program to the test assembly, and an output device such as a printer for displaying the results of the test operation. The test assembly also includes a sense and hold circuit interconnected with the driver circuit, the sensor circuit and the circuit board, which senses the output pulses from the circuit board in response to the stimulus pulse, and provides an input pulse to the sensor circuit having a period greater than the minimum duration period capable of being detected by the sensor circuit.

Abstract: With known methods for predictive decorrelation this decorrelation only applies to one or more previously scanned elements of the same picture line. In accordance with the invention a picture to be scanned is divided into sub-pictures wherein a number of picture lines equal to the number of lines comprised in a sub-picture is intermediately stored in shift registers, a processing circuit being connected to the last stages of these shift registers, which processing circuit multiplies the values of the picture elements of one sub-picture with the same number of coefficients stored in the processing device and which adds the products. In a preferred embodiment the difference values obtained in this manner are also decorrelated in a second stage, the matrix of the difference values being divided into difference value sub-pictures which are shifted, preferably diagonally, relative to the original sub-pictures. A considerably larger surrounding area of each picture element is thus involved in the prediction.

Abstract: In tomosynthesis, as is known, a series of individual images taken in different orientations, are superimposed. By shifting the individual images relative to each other the position of the layer which is sharply reproduced can be changed. However, there may still be unsharpness in said layer, in the case of image distortion during recording of the individual images, for example owing to the curvature of the input screen. This image distortion can hardly be compensated for, because it greatly depends on the projection angle. The invention provides a simple method of compensating for such image distortion. The image intensifier is then arranged and steered so that its optical axis is always parallel to the central ray. The distortion caused by the image intensifier curvature is then independent of the projection angle and can be eliminated in a comparatively simple manner.

Abstract: An X-ray apparatus, comprising a weight compensation device which is suspended from the ceiling and which includes a carriage which is displaceable along the ceiling. A component is displaceable along a patient table is suspended from the carriage by means of a cable. A signal from a transducer is applied to an electric motor which drives the carriage compensate for the relative displacement between the carriage and the suspended component.

Abstract: Means for adapting a skull for the application of a pressure transducer comprising a hollow screw which can be introduced into the skull and which can accommodate the pressure transducer, a tool for introducing the screw, and an indicator for indicating when the screw has been introduced into the skull to a desired depth.

Abstract: An electrocardiograph for recording electrocardiograms on fan-folded paper, comprising a manually operable derivation selection switch and a motor control member for the paper transport motor. The paper transport is automatically stopped when the recording stylus has passed an adjustable number of folds in the fan-folded paper.

Abstract: A current stabilizing arrangement with a first and a second current circuit in which currents with a fixed ratio relative to each other are sustained. These currents respectively flow through a first semiconductor junction and a second semiconductor junction, a resistor being alternately connected in series with the first and second semiconductor junction. The currents flowing in the first and the second current circuit are interchanged in synchronism therewith.

Abstract: A method for preventing latch-up in an integrated circuit structure, and in particular, in a CMOS structure, includes the use of a high-energy blanket or maskless ion implant that reduces the substrate resistance by creating a highly ion doped buried layer in the semiconductor device. The thickness and the positioning of the heavily doped layer can be accurately ascertained through the ion implantation process. The transition region between the highly doped buried layer and the lightly doped substrate is sharper, and thus the suppression of latch-up is more effective than in prior devices fabricated with prior techniques. An increase in the holding and critical currents is found, due to the reduced substrate resistance.

Abstract: Various samples of energetic materials are placed in multiple disposable culture tubes to simultaneously monitor and deterine their stability, reactivity, and compatibility. Each tube is evacuated and heated to accelerate aging of the samples, while a pressure transducer provides pressure readings inside the tube for computer analysis.