Abstract: A system for placing piles into the seafloor by using pressure differential as the driving force. The pressure differential is created by a pump unit located either within or external to the pile. Operation of the pump unit which displaces both water and soil across a bulkhead section, enables the pile to be driven into and under the seafloor. A section of piling with a pump unit can operate as an uplift anchor, and multiple pumps on a large diameter piling can be embedded into the seafloor as a large foundation.

Abstract: An active power-line filter which provides bandpass filtering and transient uppression. The high-power signal to be filtered is modulated to form a chopped waveform within an envelope defined by the input waveform and the modulation is removed by passing the chopped signal through a low-pass filter. The output of the low-pass filter is then compared in a differential amplifier with a low-power reference signal which is phase-locked to the primary component of the high-power signal. The output of the differential amplifier is phase-compensated for the effects of the low-pass filter and is compared to the reference in a phase-detection multiplier to produce an error signal to adjust the duty cycle of the chopped waveform so that the waveform at the output of the low-pass filter is identical to the reference waveform.

Abstract: A compass device for underwater use and having substantially no magnetic nature or influence utilizes three Hall effect generators in an array wherein two of the generators have their principal axes of magnetic response extending normal to one another and at 45.degree. to the axis of the third generator. The array is rotatable relative to a base carrying three lights and solid state analog logic circuitry for causing the lights to be variously lighted and extinguished to indicate a need to turn left, to turn right, or being on course.

Abstract: A device for entering data into an automated data processing system. The a for entry into the system is prepared and selected on multiple checklists where each checklist has the same format but different specific data entries. On each checklist there is also a unique black-in area. The data entry terminal or device includes a transparent overlay for entry of the data into the system. The transparent overlay aligns with and is placed over the checklist from which the data to be entered is to be selected. The transparent overlay contains a first set of code numbers corresponding to each data entry and a second set of code numbers apart from the data entries. Due to the arrangement of the black-in area on each checklist, only one member of the second set of code numbers on the transparent overlay is readable or codeable since the remaining members of the second set of code numbers are obscured by the black-in area on the checklist beneath the transparent overlay.

Abstract: 1. In an underwater-target direction-finding apparatus of echo-ranging ty in combination: receiver means, including a network tunable to resonance at echo signal frequency, for deriving, from received echo signals, command signals carrying echo-source direction information; target-recognition means for providing a gating signal only upon and during reception of an echo signal arising from a true target, and in time-coincidence with that echo signal; utilization means controllable by and in response to said command signals when applied thereto; and circuit means for placing said network in resonant condition in response to and only during occurrence of said gating signal, whereby to limit control of said utilization means to command signals stemming from true target echo signals.

Abstract: A dielectric corona ring to provide field shaping by spreading or deconceating an electric field for reduction or elimination of ionization of air near a high voltage insulator.

Abstract: Microwave energy is coupled into an elongate waveguide having a rectangular ain cavity with a lateral branch forming a T section. An intense beam of electrons is generated in the rectangular cavity at a particular location relative to the T to reflect incident microwave energy and produce a standing wave. Quarter wavelength spacing of the beam from the T positions either a wave node or antinode at the T. Preferably, in its `open` state, accumulated microwave energy is released as a high power output pulse by establishing an antinode at the T. Alternatively, a node at the T produces a normally `closed` state. In all arrangements, the beam of electrons, which traverses the central portion of the narrow dimension of the rectangular cavity in a direction parallel to the electrical field of its microwave energy, is of sufficient electron density to assure the desired reflection and produce the interference pattern.

Abstract: A frequency-domain beamformer is used with arrays comprising M rings with a maximum of N elements per ring, the positions of the elements having rotational symmetry. An element need not be present at each position. The outputs of each of the M rings of arrays are connected to the inputs of M sets of lowpass filters, each set comprising N filters. Each filter output is an input to a sample-and-hold circuit.A temporal discrete Fourier transform (DFT) is performed on the output signal from each sample-and-hold circuit. M demultiplexers, one for each of the M sets of DFT circuits, convert their parallel input signals into serial output signals.A memory, or function generator, is used for steering. A circular convolver convolves the outputs of the demultiplexers and the memories, the outputs of the convolvers being summed in an output summer.The beamformer is used with a 3-D array such that it has rotational symmetry, that is, if rotated at some angle, the situation is exactly the same as before the rotation.

Abstract: An improved temperature gradient and moisture regulator for electrically ered apparatus and the like is disclosed as comprising an insulated mount for supporting the apparatus whose temperature gradient and moisture is to be controlled. A thermoelectric cooler is located in effective contact with both a certain substantially central surface area of said apparatus where the cooling thereof is to be effected and one end area of an elongated heat pipe. A plurality of thermoelectric heaters is also disposed in contact with such surface areas of said apparatus as are located in predetermined spatial proximity with the aforesaid cool surface area, thereby creating a heating effect thereat for moisture control purposes. Both predetermined cooled and heated areas are caused to occur at various surface locations where the temperature gradients thereof are to be controlled.

Abstract: Non-destructive vibratory cleaning of reverse osmosis and ultra filtration membranes is accomplished by strategically positioning a plurality of ultrasonic transducers and using a frequency modulating sweep system to vibrate various and different transducers for vibrating liquid adjacent the membrane to be cleaned while preventing long period standing waves from being produced and/or continuously move a transducer along a filter module during cleaning to provide intense ultrasonic energy while preventing formation of membrane destructive standing waves.

Abstract: A portable personnel platform and ladder for use with elevated piers and ating decks has one end of a compression framework pivotally attached to a rope ladder supporting platform which extends over the pier's edge; adjustable wire backstays which provide cantilever strength connect the opposite end of the compression framework to the upper end of railings on the ladder supporting platform. The opposite end of the compression framework is adapted to have weight added thereto or to be secured to the pier deck. The length of the compression framework is such that considerable leverage is provided to support the weight of several people climbing on the rope ladder attached to the supporting platform while using much less counter-balancing force on the opposite end of the compression framework.

Abstract: Apparatus for generating pulses having selectable pulse width and selecta pulse repetition interval which may be used as a pulse repetition interval generator in a radar signal simulator. Each pulse is initiated by a clocked counter when it reaches a predetermined count from a preselected initial count. The initial count is determined by data stored in a read-only-memory which is selectably loaded into the counter to provide a variable initial count. Another clocked counter which is enabled by the leading edge of the pulse then terminates the pulse when it reaches a predetermined count from a preselected initial count.

Abstract: A system using two or more lifting or depressing bodies positioned at intals along a cable used for towing a device displaced above, below, or to one side of the tow point and for providing radio frequency services for a submerged submarine. Each of the lifting bodies is symmetrical about the cable and provides hydrodynamic lift, depression, or side force, depending on whether the system is designed to lift, depress, or offset the towed device.

Abstract: An inflatable boat having tubular side and bow forming sponsons spanned by hull bottom or floor structure including an upper inflatable floor superimposed on a lower inflatable floor, in combination with a rigid sectional keelson that is removably secured at a plurality of locations to each of the floors. Top and bottom walls of the inflatable floors are interconnected by drop stitches to limit distension to a uniform spacing when inflated.

Abstract: An InP/SiO.sub.2 insulated gate field effect transistor which exhibits power gain at microwave frequencies is manufactured by using an n-type epitaxial semiconducting InP film on a semi-insulating InP substrate and depositing a pyrolytic silicon dioxide insulating film on the conducting InP film to form the gate insulator.

Abstract: A flexible cable type of linear thermal array is constructed of a bundle of nsulated conductor pairs enclosed in a braided aramid fiber strength layer through which individual pairs are withdrawn at intended thermistor stations and the end portions thereof loosely caged in the lumens of thermoplastic tubes. After an outer layer of thermoplastic fiber is braided over the bundle and tubes openings are formed through the outer layer and tubes, the wire end portions withdrawn, thermistors connected thereto and reinserted in the tube lumens.

Abstract: An ocean bottom surveying system comprising a recording mechanism mounted on the ocean floor. A stadia moved about the recording mechanism is connected thereto. Thus, by moving the stadia to various locations in the vicinity of the recording mechanism, a series of values indicating train and elevation relationships are obtained by the recording mechanism. The recorded data is later fed to a read-out system which plots a record showing bottom elevations at various points about the ocean bottom.

Abstract: An analyzer for analyzing radio frequency signals from an FM/PM transmitter ithout prior knowledge of the transmitting frequency. The RF signal is sampled and fed to a mixer where it is mixed with the output from a comb generator having a PRF equal to the transmitter channel spacing. The signal out of the mixer is filtered to remove all but the desired frequency components. The filtered signal is fed to a frequency discriminator which provides a demodulated form of the transmitted RF signal and is fed to various parameter indicators.

Abstract: Means for biasing and driving magnetic field transducers in which the D.C. ias and the information bearing A.C. modulation signal are derived from the same power supply. The drive circuitry, by changing characteristics external to the power supply, enables both the A.C. and D.C. current to flow from a common source through the transducer with the elimination of associated de-coupling networks required for separate A.C. and D.C. supplies.

Abstract: A buoy anchoring system includes an anchor device in the form of a weighted annister that pays out line from the center of a fixed, hollow-cored bale during free fall. The line is secured against further pay out after the device impacts the bottom by wrapping about a shaft that is driven upwardly within the bale by the impact. The shaft has a line engaging cross-bar at its upper end, and is held in an extended position prior to impact by a shear pin.