Abstract: A portable, low-cost, bichannel image processing and enhancement system t can be programmed to accept two video sources, operate upon one or both simultaneously and deliver an enhanced result to a color monitor. The operations that can be performed on each source include, for example, unity gain, logarithmic amplification and differentiation, and both outputs thereafter can be subjected to such arithmetic operations as addition, subtraction and multiplication. The results are passed through an electronic user programmed window, color encoded by a quantizer and then displayed on a color monitor. The processor includes an area measurement circuit which quantitatively measures the percentage of the screen covered by any of the levels used in the quantizer, a luminance distribution analyzer which generates an histogram approximation to the distribution of grey levels in the image and a luminance cross-section analyzer which displays a graph of the image luminance along a vertical line.

Abstract: A lightweight, tunable, wideband output circuit for a klystron amplifier loys a first cavity resonator which is excited by the modulated electron beam and a filter cavity resonator coupled thereto which is provided with a coaxial probe that both capacitatively tunes this resonator and serves as a means for extracting the output signal therefrom in a mode-free manner.

Abstract: A water-weighted corer comprising a cylindrical tank mounted concentrically n a core barrel intermediate the coring tube and the shackle is provided. The tank has a water inlet at its bottom and an air vent at its top so that during descent water enters the tank through the bottom inlet, forcing air out the top vent. During free fall the falling speed imparts a substantial amount of kinetic energy to the water mass in the tank, providing the driving force required for the corer to penetrate deeply into a sediment bed.

Abstract: A sampler for in situ oceanographic investigation is provided. At any desd depth, water is drawn into the sampler, treated with a desired liquid, and expelled from the sampler by gas pressure. Any particulate matter in the sample is retained on a filter of desired pore size.

Abstract: A method of and means for installing weapons and associated launch gear or ther equipment in positions external to a submarine pressure or other vessel hull are provided. The lateral outer cross section of the submarine preferably is divided into quadrants and a replenishible weapon or equipment cartridge or module is lowered into each individual quadrant. Each module preferably contains a plurality of payloads, and after all of the payloads have been expended the expired module is easily removed and replaced by a loaded one.

Abstract: Various injection locking arrangements employing Josephson oscillators are disclosed for achieving signal amplification, frequency conversion and the detection of extremely low level signals at high frequency ranges.

Abstract: A high-speed adder circuit capable of performing addition with binary nums in 1's complement, 2's complement or sign-magnitude formats. The adder can be made in the form of a single chip that can be assembled in multiple units to expand its capacity. There is a provision for converting minus zero to plus zero so as to prevent oscillations from occurring in the loop circuit. Also, the sum output is automatically shifted to the correct format when an overflow condition occurs.

Abstract: An unlocked detector for a digital delay lock loop employs an up-down cour which periodically accumulates the algebraic sum of the quantized positive and negative adjustments made at a preselected rate by the incremental phase modulator. Whenever this sum reaches a specified threshold value corresponding to a particular phase error, an unlocked indication is given. Arrangements utilizing the same principle are disclosed for analog loops.

Abstract: Free-floating oil slicks on bodies of sea and fresh water are disposed of microbial degradation at a greatly enhanced rate by applying the essential microbial nutrients, nitrogen and phosphorus, to the oil slick in a form that dissolves in or adheres to the oil and thus selectively stimulates the activity of oil-metabolizing microorganisms.

Abstract: A phase detector which utilizes an amplifier that has the input signal coed by resistive elements to both its non-inverting and inverting input terminals operates with an amount of negative feedback determined by the magnitude of the resistive element associated with the inverting input terminal. The reference signal controls a switching device which grounds the non-inverting terminal during the time when this signal has a particular polarity. As a consequence, the gain of the amplifier shifts between equal, positive and negative values in synchronism with changes in the polarity of the reference signal, and the average value of the output signal of the amplifier is indicative of the phase relationship between the input and reference signals when these signals have the same frequency.

Abstract: An arrangement for frequency modulating a laser beam utilizes an optical prism which is disposed within the laser cavity such that the beam continuously experiences total internal reflection from one face thereof as an optical element having an index of refraction which is less than that of the prism is displaced so as to come in contact with this face and/or move variable distances therefrom. The external optical path of the beam, which exists beyond this face during total internal reflection is, thus, changed. This corrresponds to an effective change in the dimensions of the laser cavity and an appropriate shift in the frequency of the laser output beam. Amplitude modulation of the beam can also be achieved by placing the above components outside of the cavity and changing the direction of polarization of the beam entering the optical prism.

Abstract: A four electrode T-shaped conductivity cell has one pair of external elecdes affixed to opposite sides of the stem member and one pair of internal electrodes affixed to diametrically opposite arcuated portions of the inner wall surface of an open-ended tube which serves as the crosshead member of the T. The "voltage" electrodes of the cells are connected in the input circuit of a high gain amplifier which has a negative feedback loop in which the "current" electrodes are connected. An AC reference signal is coupled to this input circuit and is canceled by the voltage developed across the "voltage" electrodes. The feedback current, which is responsible for this condition and is proportional to the conductivity of the electrolyte, is converted to an output voltage whose magnitude with respect to that of the reference signal yields a ratio which is linearly proportional to the conductivity.