Abstract: A mixer system for aggressive (toxic, hazardous, corrosive, etc.) materials which are mixed (agitated, suspended, circulated, etc.) in a vessel with an impeller connected to a drive shaft has the impeller and its shaft mounted in an assembly which extends through an opening into the tank and closes that opening. The assembly has a cylindrical hub with a passageway through which the shaft extends out of an open end of the hub. Bearings which are made of materials resistant to the aggressive material in the tank are mounted in the hub and journal and support the shaft. The passageway is part of a confinement region which is terminated by a confinement shell which separates inner and outer rotors of a magnet coupling. The inner rotor is connected to the shaft, directly or through a gear train (preferably a planetary gear set). The outer rotor is connected to a drive shaft.

Abstract: An agitator tank with a magnetically coupled mixer. The mixer includes a drive magnet that is connected to a drive shaft. The drive magnet and drive shaft are both located within a drive housing that is fastened to the tank in a sealess fashion. The housing separates the drive magnet from a driven magnet that is attached to an impeller. The magnets are magnetically coupled so that rotation of the drive magnet induces a rotation of the driven magnet and impeller. The drive shaft is coupled to a motor which rotates the shaft and the drive magnet. The magnets are oriented so that the coupling surface of each magnet is essentially parallel with the longitudinal axis of the drive shaft, preferably in a circular pattern around the center of the shaft.

Abstract: A microlithographic projection imager has an illuminator system that is adjustable for the uniformity of spatial intensity of the illumination delivered to the wafer plane. This uniformity adjustment can compensate for factors tending to deviate the illumination from uniformity. The uniformity adjusting member is preferably refractive and axially movable next to a pupil of the illuminator.

Abstract: In lighting fixture such as an exit sign, a light emitting diode lighting device is provided for mating engagement with an electrical socket of the lighting fixture. The light emitting diode lighting device has a plurality of light emitting diodes with a light directing member spaced therefrom for directing light into a desired illumination pattern. The light directing member can be wedge or parabola shaped.

Abstract: The rigid coaxial transmission line disclosed herein is made up of multiple sections having outer conductors which are joined together at flanges and make up a desired length. Rather than being of equal length, the sections vary in length progressively to prevent the reflections caused by the flanges from accumulating at any frequency within the band at which the transmission line is to operate.

Abstract: The illumination of a photolithographic projection imager is given a variable annular intensity profile by using diverging and counter diverging elements that are movable relative to each other in the illumination path. An upstream element diverges the illumination into an annular configuration, the radius of which is set by the distance downstream to the counter diverging element. Convex and concave conical surfaces on the movable elements can accomplish this.

Abstract: A system for monitoring events which is capable of automatically configuring itself responsive to changes in system hardware comprising: a plurality of input circuits for detecting events and a plurality of output circuits for indicating the presence of the events; a computer means, including a microcontroller connected to the input circuits for two-way communication with the input circuits and further connected to the output circuits; a front panel and means at the front panel for further indicating the events; and means within the computer means for automatically configuring the system responsive to changes in system hardware.

Abstract: A mixing and delivery system for supplying small particles suspended in a liquid to form a slurry for delivery and recirculation which includes a mixing tank having an inlet and an outlet, a pump having an inlet and an outlet, a sample cell having an inlet and an outlet, an ultrasonic flow cell having an inlet and an outlet, and a transition bushing having an inlet and an outlet. The sample cell has first and second generally rectangular planar opposed faces, the inlet of the sample cell is rectangular and defined by two opposed sides which are respectively part of the first and second generally rectangular planar opposed faces. The opposed sides are much longer in length than the intermediate opposed sides of the rectangular inlet. The outlet of the mixing tank is connected to the inlet of the pump and the outlet of the pump is connected to the inlet of the transition bushing by a circular cross section tube, that is coupled directly to the inlet of the sample cell.

Abstract: Protocol analysis is performed by identifying frame events of communication frames from a communication link, and determining which frame events have an occurrence below a preselected frequency. The results are displayed. The frame events having an occurrence below the preselected frequency are determined by counting the occurrence of each type of frame event for a preselected period and comparing against a count of the preselected periods. The frame event may be any of the plurality of data fields for a communication frame, the occurrence of a sequence or pairs of communications frames, or the time periods between pairs of communication frames.

Abstract: An in-place flush-cleanable mixer system for mixing materials in a vessel. The mixer has an impeller connected to a mixer drive shaft, the impeller and shaft being mounted in an assembly which extends through an opening into the vessel and closes that opening. The assembly has a cylindrical hub with bearings which support the shaft and with an open passageway through which the shaft extends out of an open end of the hub. The open passageway is part of a confinement region which is terminated at its outer end by a confinement shell which separates inner and outer rotors of a magnet coupling. The inner rotor is connected to the mixer shaft, and the outer rotor is connected to a drive shaft. There are no dynamic seals which close the confinement region so that the working materials can be present throughout.

Abstract: A mounting seat for an optical element is decoupled from a surrounding annulus that fixes the mount in place in an optical system. The annulus can be one of a plurality of annuli that are interconnected to surround and enclose a coaxial array of optical elements. The decoupling is accomplished by three flexible fingers extending inward from the annulus to a seat for the optical element, which can be mounted either directly on the flexible fingers or on a concentric seating ring supported by the fingers. The flexible elements can be formed integrally with an annulus by cutting slots in its inner perimeter. The flexible elements are structured relative to the lens elements they support so that natural frequencies of vibration of the lens elements are higher than the frequencies of external vibration.

Abstract: There is provided a method for adapting a commercially available relational database management system for a microcomputer so that it has the ability to access foreign data such as real time data for the examination and processing of that data by the DBMS. In this connection the operating system being used in the computer is provided with a kernel which has a driver which simulates for the DBMS a standard file format for the foreign data that is to be obtained. The information itself is obtained by a server activated by the driver. The server gets the foreign information and passes it back for the simulated file so that the simulated file can be addressed by the normal DBMS queries or commands.

Abstract: A carbon dioxide gas measurement and control system which comprises a thermal conductivity CO.sub.2 sensor and a humidity sensor which produce separate and independent output signals which are compared in a microprocessor, thereby generating a humidity compensated carbon dioxide gas measurement which is accurate to within .+-.0.1%.

Abstract: A method (and corresponding apparatus) for determining the size distribution of small particles within a dispersing medium utilizing a particle analyzer that measures the angle of scattered light, including the step of sequentially irradiating the particles within the dispersing medium with each of a plurality of light sources positioned at different angles. The scattered light developed by sequentially irradiating the particles is focused, utilizing at least one collector lens, onto a detector array associated with each such lens and the angular distribution of scattered light associated with each of the plurality of light sources is sequentially measured utilizing each detector array associated with a given lens. Finally, the measured angular distributions of scattered light associated with the plurality of light sources, is translated into a size distribution for the particle ensemble contained in the dispersing medium, using well known inversion techniques, such as deconvolution.

Abstract: An electrical power distribution transformer of the delta/wye configuration wherein the wye secondary windings are connected in a zigzag configuration and distributed among the legs of a multi-legged transformer core to achieve substantial attenuation of flux produced by undesired triplen harmonic (third and its multiples) currents arising from non-linear loads. The transformer also achieves a substantial reduction in capacitive coupling between the primary and secondary winding by means of an electrostatic shield positioned between the primary and secondary windings and by means of a metallic ground plane positioned as a barrier between the primary and secondary terminals.

Abstract: An electrical cable penetration seal apparatus which includes a compliant module having an inner and outer regions of different durometer characteristics. In some forms of the invention the outer region has a higher durometer elastomer and a central region which is made from a lower durometer elastomer. The compliant module has an outer rectangular cross-section and the central region is a cylindrically shaped in some forms of the invention.

Abstract: In a lighting fixture such as an exit sign, a mounting base assembly is provided on a light emitting diode lighting device for mating engagement with an electrical socket. Once full mating engagement is achieved between the electrical socket and a base member of the mounting base assembly, the position of the housing carrying the light emitting diodes of the lighting device can be adjusted for alignment purposes without disturbing the full mating engagement of the electrical socket and the base member.

Abstract: A refrigeration heat exchanger section useful in circulating a substantially non-CFC refrigerant mixture which comprises: a compressor means, an auxiliary condenser, a first condenser, a second condenser, a third condenser, a subcooler and a liquid/gas separator, wherein a subcooled refrigerant liquid mixture taken as bottoms from the liquid/gas separator is distributed and expanded by a first expansion means and a second expansion means to form first and second expanded streams, respectively, such that the first expanded stream is returned to the auxiliary condenser and compressor in order to avoid overheating of the compressor.