Abstract: A single gap transducer simultaneously senses recorded control or servo signals and records data signals. A magnetic medium used with this invention is preferably a single coating magnetic medium. During recording, the recording signal is appropriately subtracted from the readback signal for removing write signal effects on the readback signal. The servo signals are preferably deeply recorded into the magnetic coating whereas the data signals are preferably recorded in an outer surface portion of the magnetic coating.

Abstract: Practice of the disclosure reduces thermal decomposition and retains stoichiometry during annealing of a multiple element intermetallic semiconductor material by heating it in an environment with an excess of the most volatile constituent. In particular, practice of the disclosure is obtained by annealing a GaAs wafer with a surface into which Si has been implanted while the surface is in proximity to InAs.

Abstract: Novel E-beam resists and process for their use are described. These resists are conducting organic charge transfer salts. Films of these materials can be deposited by solvent casting or by sublimation. The deposited film can be made to produce a positive or negative resist image depending on the E-beam energy and exposure time. Exposure of this material to an E-beam produces patterns having differential electrical, optical and solvation properties.

Abstract: Novel E-beam resists and process for their use are described. These resists are conducting organic charge transfer salts. Films of these materials can be deposited by solvent casting or by sublimation. The deposited film can be made to produce a positive or negative resist image depending on the E-beam energy and exposure time. Exposure of this material to an E-beam produces patterns having differential electrical, optical and solvation properties.

Abstract: Apparatus is disclosed for quickly testing memory arrays of multiple recirculating loop memory elements and for locating faulty elements, if any, within designated subdivisions of said array. All loops are loaded with identical test bits. The loaded data is verified and faulty elements, if any, are located by means of a plurality of comparison AND gates. Each gate is connected to the output of a respective subdivision of the array elements and produces a first output signal when all such outputs are identical (on a serial bit-by-bit basis) and produces a second output signal when all said outputs are not identical. The output signals from the respective comparison AND gates are sensed in serial succession to locate the array subdivision containing any faulty elements.

Abstract: A single print element of a typewriter has the characters thereon impact a record sheet at one of two velocities depending on the area of coverage of the character. Each character on the print element is selected for printing by movement of one of a plurality of interposers with each interposer selecting two characters. One of the two characters is selected by movement of the interposer when a pair of operatively connected shift levers is not depressed while the other of the characters is selected by the same interposer when the shift levers are depressed. A vane, which extends between the shift levers and is pivotally connected thereto, is disposed in the path of movement of all of the interposers. The vane has an opening for each interposer when the print element is to impact the record sheet at the higher velocity so that the vane is not engaged by the interposer during movement of the interposer.

Abstract: An improved current switch emitter follower (CSEF) latch has reduced "noise" in the output signal from equal and opposite operation of the output transistors. The improvement resides in dotting the collector resistors of the input transistors in each current switch with a common shift resistor. The dotted collector resistors control the output transistors whereby one turns on and the other turns off with little change in output signal level as clock signals change to the input transistor.

Abstract: A system is described for enabling the connection of a diagnostic/debugging processor to another host processor for the purpose of troubleshooting that processor's hardware and software. The system is composed of an interface between the diagnostic/debugging processor per se and the host processor to be diagnosed, and of software resident in the diagnostic processor to perform functions required by the user of the system. The system is specifically designed for use with a host processor utilizing LSSD design rules.

Abstract: Apparatus for measuring fluid pressure and velocity, and in particular for maintaining an aspirator air velocity constant under varying atmospheric conditions. A precisely controlled air velocity is provided by a reference air source whose frequency is derived from a crystal oscillator. The total air pressure from the aspirator wind tunnel is compared with the total air pressure from the reference air source using a matched thermistor pair technique to convert the pressure difference into an electrical error signal which is used to control the main air source for the aspirator wind tunnel such that the error signal is maintained at zero, thereby maintaining the air velocity in the aspirator constant.

Abstract: The invention is a structure for improving the cooling characteristics of a silicon semiconductor device immersed in a fluid coolant. The cooling improvement is achieved by enhancing the nucleate boiling characteristics of the silicon device by initially forming lattice defects on the backside surface of the device by sandblasting and subsequently etching the damaged surface to remove the lattice defects and thereby produce an intricate surface morphology which provides nucleate boiling sites.

Abstract: In a typewriter, a ribbon is contained within a cartridge which is in turn placed upon the ribbon mechanism support of the typewriter. The cartridge is maintained rigidly clamped to the support but readily releasable by means of operator actuation of a release lever. The cartridge may either be a single cartridge or may be stacked such as where two cartridges are utilized together, one containing a print ribbon, the other containing, for example, a correction ribbon. The cartridge containing the print ribbon is provided with a bottom plate or surface which is formed to define an aperture therein for the admission of a clamping member attached to the support. The clamping member is inserted into the aperture and then caused to rotate about its axis a part turn at which point the clamping member engages an inclined surface on the interior of the cartridge causing the cartridge to be wedged downward against the support.

Abstract: A solar collector having a lens array serving as a light incidence surface that focuses the light energy onto radiation passages in a coating located in the focal plane of the lens array, the coating having a radiation reflecting surface on the side away from the incident light and the radiation passages being enabled through energy that is locally effective through focusing of impinging light.

Abstract: A radiation analyzing system including a beam splitting prism, an analyzer and a photodiode array arranged in an evaluation plane. Upon passing through the prism radiation to be analyzed is split into two beams vertically linearly polarized to each other which include a small angle and show a phase shift that is a function of the distance from the optical axis. The difference of the phase positions of these two beams is a function of their distance from the left or right edge of the prism. The analyzer, which is arranged behind the prism and whose axis of polarization is inclined relative to the directions of polarization of the two vertically polarized beams, produces a periodic intensity distribution when the impinging radiation is polarized at least partly and has a component in parallel to the axis of the analyzer.

Abstract: Apparatus and method for interconnecting a controlling unit and a controlled unit include providing a plurality of operational nulls. One of the nulls is a logically disconnected null; another of the nulls is a logically connected null. All operations proceed in a predetermined sequence from either of the two nulls. The two units interchange signals indicating the interconnecting state; that is, both units supply the null signal simultaneously except when there is a desire by one of the units to change to another operational state. Unique status recovery procedures and apparatus are disclosed that enable recovery of status and emergency control of units during error prone or degraded operations. All of the functions are based upon an encoded set of tag signals being exchanged. For reliability purposes, complementary tag signal combinations provide diverse functions.

Abstract: A method and means are provided to increase the effective data transfer rate between a direct access storage device (DASD) and a central processing unit (CPU) communicating with the DAS device through a channel and a DASD control device.A command issued to the AS subsystem which requires mechanical motion in the DAS device is stored in the subsystem and the subsystem provides a response to the channel indicating that the command has been carried out, without actually carrying out the command. The channel responds by issuing one or more additional commands in the chain to the subsystem which may be carried out without mechanical motion. When a command is issued to the subsystem which again requires mechanical motion of the device, the control device causes the stored command to be executed essentially simultaneously with the newly received command.

Abstract: The invention relates to an ink jet printer and in particular to correcting the flight path of drops from the printer to reduce print position error on the print media. Compensation values can be stored and retrieved for use by the printer to correct the flight of a drop to the print media. The compensation values are based on the pattern of print data representing the drops in the ink stream with the drop being compensated. To reduce the number of variables that must be dealt with, one or more portions of the print data can be grouped into one or more blocks and each block treated as having a single effect on the drop being compensated. However, basing the compensation value on one predetermined treatment of print drops as having individual effects or as having individual effects in combination with one or more group effects on the drop being compensated does not produce the optimum print appearance for all combinations of print data.

Abstract: Disclosed is a self-aligned process for providing an improved bipolar transistor structure.The process includes the chemically etching of an intermediate insulating layer to undercut another top layer of a different insulating material in a self-aligned emitter process wherein the spacing of the emitter contact to the polysilicon base contact is reduced to a magnitude of approximately 0.2 to 0.3 micrometers. In addition, in the process an emitter plug is formed to block the emitter region from the heavy P+ ion dose implant of the extrinsic base.

Abstract: A driver for an electromagnetic device, e.g. a solenoid, is capable of driving the device at a fast cycling rate while dissipating minimal power. In response to an actuating signal, a capacitor connected to a high voltage source supplies a high level current to the device for a short time interval until the capacitor is charged. Thereafter, a resistor connected to a low voltage source, supplies a low level current to the device, thus minimizing power dissipation. In response to the cessation of the actuating signal, a transistor connected in parallel with the capacitor turns on, and acts as a low impedance in parallel with the capacitor, to rapidly discharge the capacitor. Once discharged, the capacitor again may supply high level current to the device when the actuating signal is reapplied.

Abstract: An aluminum-transition metal Schottky barrier contact, and methods of fabrication thereof are disclosed. In one preferred embodiment, the junction is comprised of an aluminum-tantalum intermetallic layer abutting a silicon substrate. Alternate embodiments utilize an intermetallic compound of a metal selected from the group of tantalum, zirconium, hafnium, niobium, titanium and nickel in combination with aluminum. The preferred embodiments can be fabricated by evaporation of a layer of a metal selected from the above mentioned group followed by evaporation of a layer of aluminum on a silicon substrate, after which an annealing step is utilized which creates the desired intermetallic compound in a layer abutting the silicon surface. Alternatively, the junction can be created by hot or cold sputtering of a preselected intermetallic compound of one of the metals with aluminum directly upon the silicon substrate, followed by deposition of a conductive layer such as aluminum.