Abstract: The present invention is a process and apparatus for the synthesis and growth of single crystals of phosphorus compounds starting with the elemental materials in a single furnace without external exposure. The apparatus of the present invention is a crystal growth furnace heated by RF coils. Inside the furnace is a susceptor for holding a crucible. Above the crucible is selectively positioned a phosphorus improved injector. The non-phosphorus materials are placed in the crucible and melted to a desired temperature. The phosphorus material previously placed within the injector is heated by the radiant heat from the crucible to drive the phosphorus vapor into the melt through a tube. This is closely controlled by noting the temperature within the injector and adjusting the height of the injector above the melt to control the temperature within the phosphorus material. After the formation of the stoichiometric melt, the seed is inserted into the melt for crystal growth if so desired.

Abstract: The invention consists of four components: a diverter assembly, a blocking plate assembly, a blast deflector and an exhaust duct. The diverter attaches to the gun barrel clamp and rotates and recoils with the gun; as gases leave the gun barrels and enter the diverter they are redirected by it from axial flow to radial and tangential flow, thereby imparting a forward force and a torque to the barrel cluster. The blocking plate assembly does not rotate within the diverter and acts to limit the egress gas and the gas that flows into the non-firing gun barrels. The blast deflector has a collector that surrounds the diverter and collects the diverted gases. The duct receives the collected gases and conducts them to the desired exhaust ports.

Abstract: A method to measure the far field antenna pattern of an experimental antenna on a smaller range than conventionally used. The basic innovation of the present invention is that the implementation is moved in straight line, toward or away from the antenna under test (AUT), and the measurements are taken while the AUT is rotated about its phase center in a manner that is synchronized with the radial probe.

Abstract: A time efficient method for processing digitized doppler radar signals and establishing adaptive target detection thresholds which are used to distinguish targets from noise and clutter. After subdividing the range-doppler matrix into several equally-sized parallel processing elements, the radar system's signal processor executes this process on each processing element in parallel. This process involves the processing of the digitized radar signals stored in each parallel processing element by integrating over the amplitudes of each data cell in a given parallel processing element. This, in turn, yields a secondary data array for each parallel processing element equal in dimension to the parallel processing element itself. Target detection thresholds for all cells in each parallel processing element can then be established from the values stored in these secondary data arrays.

Abstract: A rapid fire electromagnetic launcher system (EML) employs a plurality of capacitor modules which are charged by an equal number of modules of lead acid batteries. The invention comprises the combination of standard automotive lead acid batteries for charging an electrolytic capacitor array which is switched into an Electromagnetic Launcher (EML) by means of silicon controlled rectifiers, and a control circuit for controlling the loading and launching of projectiles at a very rapid rate. The system includes a multishot preinjector and rapid fire controller for operating the system in a safe and reliable manner. The system includes a preaccelerator, magazine and barrel. The combination eliminates the low power density limitation of the batteries, the requirement to repetitively commutate energy out of an inductor, and allows for a modular system than can be expanded to provide higher energy to each projectile in the burst.

Abstract: A terminal is disclosed for use with a system for digital conferencing over narrowband channels which allows use by multiple simultaneous speakers and which allow for interfacing between systems which operate at different bit rates. For each conferee, the terminals interconnect between an A/P converter and a modem, and contain an analyzer and a synthesizer. The analyzer receives digitized speech and encodes it at the system data rate for transmission to the bridge by the modem. The synthesizer receives encoded digital data streams and produces therefrom artificial speech at selected data rates that are inversely proportional to the number of external speakers. One technique used by the synthesizer is the use of overlap-add synthesis which allows for a particularly simple method for synthesizing multiple speakers. With the over-lap add technique a speaker's parameters, pitch voicing, and spectrum, are used to fill out an FFT buffer. The inverse transform is taken and summed in the usual overlap-add manner.

Abstract: The use of a liquid nitrogen (LN.sub.2) bath to produce thermal stress between an aluminum heat sink and a silicon circuit board by deep cooling, makes it possible to separate each from the other product undamaged. This allows repair or replacement of the silicon substrate in a very short time with very little turn around time.

Abstract: An improved microstrip patch antenna has a pair, for example, of dielectric overlay strips attached along the radiating edges of the patch where the patch is rectangular. By optimizing dimensions parameters and materials, the bandwidth of the patch is increased substantially as well as the amount of radiated energy.

Abstract: A method is disclosed for testing or screening metal or polysilicon conductors and contacts on microelectronic devices that it uses a modified design layout for individual logic gates to enable high current density testing of all such elements used in the final functional circuit. The method uses a special metal pattern adding metal conductor paths to enable high current testing of normal conductors and contacts at an intermediate point during fabrication. The metal layer is patterned a second time to remove the high current paths and enable functional operation. This allows burn-in and screen testing to be performed at higher current densities than would otherwise be possible.

Abstract: A two transistor dynamic random access memory can be treated as a pair of voltage controlled elements which are reversibly controlled in a three step process. In the first step, a capacitance is charged on the controlling terminal of memory transistor. The second step entails isolating the charge on the capacitance of the controlling terminal. The third step entails providing a reversibly controlled voltage on the controlling terminal to further control the two memory transistors without altering the charge of the capacitance. This allows a non-destructive reading of the output of the stored information signal.

Abstract: A method for economically producing low sidelobe levels in the far field pattern of an array antenna is disclosed. The current fed to the subarrays is identically tapered to the elements of each subarray. Both the subarray current taper and the element current tapers are optimized to yield the lowest possible sidelobe levels.

Abstract: In order to measure the far field antenna pattern of a phased array antenna, the phased array is focused at a probe antenna which is a specific distance away from the aperture. The antenna pattern is then measured by moving the probe antenna on an elliptical arc about the antenna under test.

Abstract: Chip-like stacks of thinned chips are mounted in wells etched into a substrate. A "chip-like" stack is a stack of chips, which in the aggregate have a height approximately equal to that of a single conventional chip. These chip-like stacks are mounted in a variety of packages. In a preferred embodiment, the stacks are mounted in wells within the substrate of an integrated circuit and the stack is provided with a patterned overlay so that all the circuit connections can be made from the upper surface of the stack. The patterned overlay is protected by a planar insulator. A plurality of substrates may be stacked, one upon the other.

Abstract: A compact, high-repetitively(rep)-rate photolytic atomic iodine laser (PIL) using blowdown flow and cryogenic pumping increases the rep rate from 0.5 Hz to at least 10 Hz. The average power of the pulsed laser increases from 35 to 700 Watts output. The present invention maintains the demonstrated beam quality of better than 1.5 x diffraction limited, a coherence length of greater than 45 meters, to J/pulse output energy; polarization extinction ratio greater than 100:1; pulse length of 7-12 sec; and jitter less than 1 radian. The laser power and beam quality in this type of device is relatively insensitive to the actual fuel pressure and temperature in the laser cavity at the time of the pulse. The cavity pressure is allowed to vary between plus or minus thirty percent of the optimal value of the cavity height-pressure product of 300 torr-cm during the run period of nominally twenty seconds. Flow is established by boiling liquid C.sub.3 F.sub.7 I at a temperature of 10.degree. C.

Abstract: An insulating film with low thermal expansion characteristics is formed by depositing aluminum alloy materials in thin film form without the use of high temperatures and which can then be oxidized to create an insulating film which has low stress. A mixture of aluminum and magnesium oxides, known as spinel, has the proportions which are approximately correct for zero expansion when crystallization results from the oxidation.

Abstract: A technique that enables array error correction by replacing the signals from failed elements with processed signals derived from operating elements. The procedure is shown to be useful in a multisignal environment. Expressions are derived that give the signal to noise ratio of arrays with any number of failed elements with replaced signals. These relations are used to investigate the counterintuitive limiting case in which all the signals of an array are replaced by the reproduced signals.

Abstract: The free electron laser wiggler has therein a device for generating a variable short period wiggler field. A Type II superconducting material is formed into a field modifying means having a channel therein through which a beam of free electrons travels. The field modifying means is held within a vacuum chamber further having a source of external magnetic fields therein and a cooling means therein. The magnetic field generated must fall within the upper and lower critical magnetic field of the Type II superconducting material. The magnetic field penetrates the superconducting material generating a mixed state of superconducting and normal regions. The amplitude and period of the wiggler field in this structure can be controlled by varying the temperature, applied magnetic field, and the impurity concentration in the superconducting material to affect the fluxoid lattice. The electron beam interacting with this wiggler field outputs short wavelength radiation.

Abstract: The disclosed method is for radiation testing of a nanostructure photonic device under test (DUT). The method comprises the application of a beam of optical energy to the DUT, and then establishing a computer data base for the performance of the device under test during the application of the beam. Thereafter, a tightly focused, steerable radiation beam is generated and focused on to a selected nano sized area of the DUT. A second data base is established for the performance of the DUT resulting from the application of the radiation beam, and the data of the first data base are compared with the data of said second data base to determine the affects of applying the radiation beam to the DUT, or to alter the device physical properties such as its refractive indicies, absorption, preferred polarization, and electrooptic characteristics, including electrooptic coefficients, photoelastic constants, operational (fundamental) wavelength and coupling coefficients.

Abstract: The invention provides a woven composite lightweight turbine blade in which, e.g. ceramic or carbon fibers are woven around a foam core in the airfoil section of the blade and around a removable mandrel in the dovetail section of the blade, and braided at the tip and root thereof to define a woven blade pre-form. An infiltrant of e.g. phenolic, carbon or ceramic is added to the woven pre-form, which is then pyrolized to provide a thermally stable matrix in the pre-form and define a composite woven blade therewith. The resulting blade has a cavity in the air foil section between the tip and root sections of the blade and a hollow dovetail section. The dovetail section has reinforcing carbon or ceramic fibers mounted across the resulting passageway through the dovetail, which fibers are cooled by air passing through such dovetail passage such that the dovetail acts as a heat exchanger for the so-formed woven composite blade.

Abstract: The uniform droplet injector assembly is a rigid, low mass injector having a plurality of nozzles therein attached to a manifold. The manifold vibrates by piezoelectric actuators and springs in combination. The droplet injector array allows the process stream to flow through the injector assembly with the droplets uniformly dispersed into this stream. The moving parts such as the injector assembly, springs, and actuators are structurally resonant at a frequency near the droplet formation frequency. The colinear, spring/actuator configuration minimizes internal stresses due to manufacturing tolerances, preloading requirements, temperature changes, and cyclic operation in a large area generator. The linear spring/actuator configuration has low stiffness in the vibration direction and high stiffness in transverse direction to eliminate motions which would cause nonuniformly sized droplets.