Abstract: One mole of 2,2,3,3,4,4-hexafluoropentane-1,5-diol is reacted with one mole f formaldehyde in the presence of an excess of trifluoromethanesulfonic acid to produce 1,3-dioxa-5,5,6,6,7,7-hexafluorocyclooctane.

Abstract: The preparation of transition metal dithiene complexes is disclosed. By the process improved yields of the metal dithiene complexes are realized by substituting highly polar aprotic solvents such as N-methylpyrrolidinone or high boiling point solvents such as diethylene glycol in place of dioxane in the reaction sequence.

Abstract: A fiber optic magnetic gradiometer for measuring both ac and dc magnetic field gradients. The gradiometer utilizes an optical interferometer with magnetostrictive magnetic field sensing elements in each of the interferometer arms. Ac and dc magnetic field biasing is achieved by disposing each of the magnetic field sensing elements within its own magnetic field coil and utilizing a variable dc current source for applying dc current to each magnetic coil. An ac current source at frequency w.sub.o connected across the circuits for the dc current sources is used in conjunction with a variable attenuator to control the ac bias to the respective magnetic coils. The detected output from the interferometer is processed either by bandpass filters or a spectrum analyzer to obtain the signal component at w.sub.o, which is proportional to the external dc gradient magnetic field, and at w.sub.o +w.sub.s, (where w.sub.

Abstract: A frequency independent constant beamwidth lens antenna concept is descri. The device may be configured in various ways such as with a cylindrical lens with a retina. The essential feature is that a twisted planar or hyperbolic paraboloidal phase or wave front is formed by the antenna which then in turn produces a frequency independent constant beamwidth beam in the far field of the antenna. Moreover, the frequency independent constant beamwidth beam may be steered or scanned in azimuth without moving the lens.

Abstract: A chemical composition formed from a chelating agent, polymeryable bonding agent, and a high dielectric solvent which eliminates intermodulation interference when applied to "rusty bolt" junctions.

Abstract: A multi-engine helicopter fuel supply balance system effects automatic trfer of fuel from a larger tank to a smaller tank in response to low fuel level in the smaller tank when in automatic mode, and effects a transfer of a predetermined quantity of fuel between selected tanks by timed operation of a constant delivery pump when in manual mode.

Abstract: A lasing system for lasing at x-ray wavelengths. In one embodiment, a neoike sulfur ion S.sup.6+ plasma is caused to radiate on its 3d.fwdarw.2p transition to pump a lithium-like neon Ne.sup.7+ plasma to obtain x-ray lasing. In a second embodiment, a lithium-like silicon S.sub.i.sup.11+ ion plasma is caused to radiate on the 3d.fwdarw.2p transition to pump lithium-like magnesium Mg.sup.9+ plasma to obtain x-ray lasing.

Abstract: A method for effecting repairs of the damaged components of a machinery in he field which would otherwise require high temperature treatment of the damaged components to form a metal-oxide epoxy joint in a shop. The method includes preparing a repair patch which includes a metal sheet with the metal oxide layer thereon, applying a thin high performance protective coating thereover, covering thereof with a sacrificial backing sheet and then curing the adherent-top coat backing sheet to form a highly durable bonded system which can be stored until needed. At the time of repair the backing sheet is removed by sanding or grit blasting and the adherent is applied to the structure to be repaired under ordinary temperature conditions.

Abstract: A slotted line tunable microwave filter of the type having a metallic layer aving slot patterns thereon, and an insulating layer, the filter also including a variable bias D.C. magnetic field source, for imposing a magnetic field on a dielectric junction in the metallic layer, which may be varied to tune the filter resonant frequency.In one embodiment of the invention the slot pattern comprises a first set of slots and a second set of slots.The first set of slots comprises a first slot disposed coincident with a negative x axis and the second set of slots comprises a second slot disposed coincident with a positive x axis.

Abstract: This is a process that allows previously cleaned steel (which may have been leaned in any of several different ways) to be passivated with a rinse of almost pure water, that is made slightly alkaline to inhibit corrosion, and flash rusting such that any small residue remaining on the steel surface after drying of the water will itself evaporate and in such a manner that any remaining residue will be incorporated into a subsequently applied non-aqueous protective coating without leaving any water-soluble or ionic residue on the surface of the steel that will cause corrosion or affect adhesion of the protective coating.

Abstract: A method for measuring the separation between two spaced light-reflecting rfaces by means of a single laser pulse. The reflected light is divided into two beams which are then projected at the same angle .theta. onto the same area on a photographic film to form interference fringes. The film is developed, placed on a translating platform, and passed through the beam of a CW laser, a portion of the beam being diffracted by the interference fringes recorded on the film. The distance .chi. between the high-intensity points of adjacent interference regions is measured and the separation of the two light reflecting surfaces is calculated from the formula d=.chi. sin .theta..

Abstract: A remote reservoir for automatically dispersing a liquid electrolyte mixt into the cells of a battery upon activation.

Abstract: A locking system that consists of two locking mechanisms protected by a dl resistive shutter plate. The shutter plate can be rotated to expose a first lock which when unlocked allows it to be further rotated to uncover the second lock. Upon unlocking the second lock, the drive for the main bolt lock can then be actuated.

Abstract: An axial-type homopolar motor having high density, high current fiber brush ollectors affording efficient, low contact resistance and low operating temperatures. The collectors include a ring of concentric rows of brushes in equally spaced beveled holes soldered in place using a fixture for heating the ring to just below the solder melting point and a soldering iron for the local application of additional heat at each brush. Prior to soldering, an oxide film is formed on the surfaces of the brushes and ring, and the bevels are burnished to form a "wetting" surface. Flux applied with the solder at each bevel removes to an effective soldering depth the oxide film on the brushes and the holes.

Abstract: A controlled opening shock parachute is made by dividing each gore of a cular parachute into two panels, an upper and a lower. The adjoining edges of the panels are of different lengths and left unjoined so an uneven slit is formed. During the parachute's opening sequence, air flows into the slits to open the upper panels. After the upper panels are inflated, air flows out of the slits as the lower panels open.

Abstract: A method and apparatus for reducing noise from a near-field noise source sent together with signals from a far-field source. The method uses an adaptive shaping filter and a summer, in conjunction with a directional reference sensor and a primary sensor which have at least a common sensing element therebetween. The directional reference sensor situated between the near-field noise source and the far-field signal source, rejects the broad-band signal but accepts the broad-band noise and feeds this noise into a reference channel of the adaptive filter. The primary sensor accepts both the far-field signal and near-field noise with equally sensitivity. The primary sensor feeds into the primary channel of the adaptive filter. The adaptive filter system subtracts the noise in the reference channel from the signal-plus-noise in the primary channel, thus producing an output having a greatly improved signal-to-noise ratio.

Abstract: A depression gun pod for detachable connection to an aircraft stores suspension rack, the pod having a gun and having a gun mount providing for depression of the gun in elevation and for limited azimuth movement; the mount utilizing a plurality of planar frame-like members which are disposed in a compact configuration within the pod when the gun is in a forward firing position and which rigidly support the gun as it moves in depression and azimuth.

Abstract: A diether-linked bisorthodinitrile monomer having the formula: ##STR1## is mixed with an amine curing agent and heated to a temperature sufficient o induce polymerization. The resulting polymer has a range of conductivity which is a function of the cure time and temperature.

Abstract: A closed loop system for communication of binary data utilizes master or a sources and slave or data sink stations, each including a transmit buffer, a three-state transmitter, a receiver, a comparator, a three-state receiver, a receive buffer, a timer, a filter and a local controller, with the transmitter of each station connected by a transmission path to the receiver of the other station. Binary data bits are separated by spaces and bits and spaces are transmitted singly from the source station, received and retransmitted back to the source station by the sink station, with each retransmitted bit or space being compared at the source station with its original transmission for verification before a succeeding bit or space is transmitted.

Abstract: A fluid oscillator having a tube provided with a slit which is pivotable o a boundary layer of air flowing over a missile for arming and is pivotable from the missile exterior. The tube is configured so that the boundary layer excites oscillations within the tube at a predetermined velocity at which the missile is to arm.