Abstract: An electronic digital crossconnect system electronically interconnecting individual subscriber channels between various higher rate digital facilities. The system provides for a simplified, lower-speed information bus structure, improved reliability, and the ability to connect intact a high rate digital facility without super frame alignment.

Abstract: A process for recovering the energy and chemical content of an aqueous black liquor utilizing a reactor containing a drying zone located above a gasification zone. The reactor contains a bed of porous solid carbonaceous material in the gasification zone. Heat losses are restricted, preferably from both zones, by the provision of a layer of insulating material about the reactor. An oxygen-containing gas is introduced into the gasification zone in an amount less than about 60% of that required for complete combustion of the black liquor such that there is produced partial combustion and gasification reactions sufficient to maintain the temperature at an upper surface of the bed in the range of from about 870.degree. to 1200.degree. C. and to form a hot combustible gas which rises from the gasification zone.

Abstract: An analog echo suppression circuit is used with a telephony 2-wire circuit to 4-wire circuit interface. The 2-wire circuit carries a first signal and the 4-wire circuit carries a second signal. Each circuit has an input port and an output port. The interface produces an echo signal on the output of the 2-wire circuit when the second signal is received at the input port of the 2-wire circuit. A first communication channel connects the output of the 4-wire circuit to the input of the 2-wire circuit. A second communication channel connects the output of the 2-wire circuit to the input of the 4-wire circuit and series analog switches or transmission gates can interrupt the second channel. A comparator circuit receives the first and second signals from the first and second channels and has first and second outputs.

Abstract: A constant resistance loss/slope filter circuit has a plurality of cascaded circuit sections. Each circuit section has a fixed resistive pad and a slope equalizer. Each circuit section also has a switch for switching inputs and outputs of the circuit sections between the fixed resistive pad and the slope equalizer. Each of the circuit sections has a fixed resistive pad with a different predetermined value loss and a slope equalizer with a different predetermined value of a slope.

Abstract: A digital clock recovery circuit is described which extracts the signal element timing from a return-to-zero data stream. A converter changes the bipolar digital data stream to at least one first return-to-zero data stream representing pulses in the bipolar digital data stream. In these streams, a logic one is typically represented by a pulse of undetermined width less than the bit period. A logic zero is typically represented by no pulse. A reference clock signal having a predetermined frequency is required by the circuitry. An edge detector detects the positive going edges of the pulses in the combined return-to-zero data stream, and generates load pulses to a counter which are synchronized to transitions of the reference clock signal. The counter receives the load pulses and utilizes reference clock signal to produce a recovered clock signal, skiping or repeating counter states to kepp the recovered clock signal aligned with the bipolar digital data stream.

Abstract: A metal-semiconductor field-effect transistor (MESFET) is provided with a p-type region adjacent the n-type region under the drain contact. Holes injected from this p-type region compensate the negative space charge region at the channel to substrate interface, thus minimizing considerable substrate effects.

Abstract: A universal gate array is illustrated using a specific pattern of CMOS (Complementary Metal Oxide Silicon) Transistors in an array which provides a high degree of board utilization in the layout of small runs of integrated circuits where the high cost of completely customized boards is unacceptable. The array comprises a continuing pattern of two sets of three (3) series connected transistors in a cell surrounded on all four sides by cells each containing two single transistor gates of each channel type.

Abstract: An adjustable slope equalizer is disclosed for maintaining a predetermined output level at a predetermined frequency. An equalizer comprises: an adjustable input means; a first voltage divider means having an output and having an input operatively connected to the low impedance input means; a second voltage divider means having an output and having an input operatively connected to the low impedance input means; an adjustable high impedance means having an output and having at least two inputs operatively connected to the outputs of the first and second voltage divider means; and a SAG correction means operatively connected to the output of the adjustable high impedance means. The output of the SAG correction means has the predetermined output level at the predetermined frequency for any setting of the adjustable high impedance means.

Abstract: A photo-electric sensor comprised of a wafer of semiconductor material with a first plurality of photodetectors integral with its rear surface, its front surface being an electrode comprised of a transparent layer of electrically conductive material, has those detectors so spaced apart from each other that the total array can be sampled by a second plurality of charge coupled device multiplexers, each of which multiplexers has its input terminals spaced closer together than are the photodetectors. Each multiplexer input terminal is mechanically and electrically coupled to a photodetector through metallic leads and columns, such leads and columns being so configured as to preclude obtrusion of multiplexer structure into space outside the wafer's lateral extremities, which results in no "dead" space in a focal plane consisting of either one sensor or a plurality thereof abutting each other.

Abstract: A multilevel data base memory structure for use by the processor control of each of a plurality of interconnected telecommunication switching systems so that communications between any two of the systems can be established with minimal interaction by the users. A comprehensive directory number plan provides for the allocation of blocks of at least one hundred directory numbers (i.e. 2400-2499) to the stations or features of each switching system. For those directory numbers serviced by a switching system the thousands/hundreds digits are utilized as addresses of locations of the memory structure first table level, the contents of which are pointers to various sections of a second table level. Within each such section the tens/units digits are used as addresses to define a location having stored therein an ultimate system function representative of, for instance; a standard call, conference call, speed dial . . . etc.

Abstract: A method of forming a superconductor-barrier-superconductor junction device by the steps of depositing a first superconductive layer on a substrate, forming a barrier layer on the first superconductive layer and depositing a second superconductive layer on the barrier layer. A layer of photoresist is then deposited over the second superconductive layer and patterned together with the second superconductive layer to form a mesa structure. A dielectric layer is deposited over the mesa structure, and the photoresist layer portion is dissolved thereby lifting off the dielectric portion overlying said second superconductive layer portion.

Abstract: An electrochromic display cell including a pair of enclosure plates, at least one of which is transparent, and a counter electrode and a display electrode disposed between the enclosure plates. A layer of electrochromic material is disposed on the display electrode. A liquid electrolyte material is disposed between the counter electrode and display electrode, the electrolyte material being mildly acidic and having a pH between 2 and 5. The layer of electrochromic material is preferably selected from the group consisting of a diphthalocyanine of a rare-earth element, yttrium and scandium.

Abstract: An orbital mission planning indicator device provides a visual indication of the relationship between the plane of orbit of an artificial earth satellite and the angle of incidence of solar energy thereon, for all seasons of the year and for arbitrary times and places of launch of such satellite. It also provides indications of the relationship of deep space points of interest to the same orbital plane for adaptability of pointable sensors such as telescopes, antennas and solar arrays to orbital missions calling for use of such equipments.

Abstract: A positive-displacement compressor receives a gaseous mixture of fluorine and uranium pentafluoride particles. The mixture is compressed by the compressor to cause the fluorine in the gas to react with the uranium pentafluoride to form uranium hexafluoride. The compressed mixture in the compressor is removed by a stream of warm fluorine gas to scavenge the excess particulate matter from the compressor and enhance the refluoridation process.

Abstract: An internally manifolded plate for a plate/fin-type heat exchanger comprises a side port contiguous with and transverse to at least one channel, and wherein the channel is contiguous with an end port. The plate may be of unibody construction and also include integral side and end external manifolds.

Abstract: A pump having inducer blades configured to have a tip thickness less than about twice the clearance between the tip and the adjacent housing to prevent cavitation damage to the inducer blades.

Abstract: Direct firing downbole steam generator basically comprises an injector assembly axially connected with a combustion chamber. Downstream of the combustion chamber and oriented so as to receive its output is a heat exchanger wherein preheated water is injected into the heat exchanger through a plurality of one-way valves, vaporized and injected through a nozzle, packer and check valve into the well formation.

Abstract: A fluorinating agent having an empirical formula which comprises FOIF.sub.4 O whereby said fluorinating agent is prepared by a metathetical reaction of solutions of NF.sub.4 SbF.sub.6 and CsIF.sub.4 O.sub.2 in anhydrous HF, removing the precipitated CsSbF.sub.6 and HF solvent, followed by thermal decomposition of the filtrate residue.

Abstract: A family of liquid hydrocarbon motor fuel additives known as polynitro alkyls having the general formula R.sub.1 --C(NO.sub.2).sub.2 --R.sub.2 have been found to enhance the overall combustion characteristics of motor fuels by increasing combustion efficiency and reducing undesirable combustion by-products.

Abstract: A tube-in-tube shelless heat exchanger having the capability of being modularized comprises a plurality of single element tube rows 18 in combination with header means 26. The single element tube row 18 comprises a plurality of inner 12 and outer 14 concentric tube pairs for carrying a first and a second heat transfer fluid, forward and aft tube sheets 20, and flexible arcuate manifold means 16 for outer tubes 14.