Abstract: Built-in test circuitry, which is appropriate for monolithic integrated circuit chips that are to be connected in a plural-chip package, uses electronic token passing to select one of the test input ports in the circuitry to be tested for application of test input vectors. The built-in test circuitry also uses electronic token passing to select one of the test output ports in the circuitry to be tested from which test results are to be supplied. Methods for testing based on these token passing procedures are described.

Abstract: A passive starting circuit foran electrodeless HID lamp includes a series resonant LC circuit including an inductor of variable impedance coupled in series with the parasitic capacitance between a starting probe and the excitation coil of the lamp, and further including a coupling capacitance for directly coupling the starting circuit to the excitation coil. The coupling capacitance is connected between the high terminal of the excitation coil, or a point in the circuit at approximately the same potential thereof, and a conductive support for holding the lamp and starting probe in a lamp fixture. In this way, the starting voltage is maximized for more efficient and rapid starting. Preferably, the series resonant capacitance of the starting circuit is optimized so that the ballast requires little, if any, retuning after the lamp has started.

Abstract: High efficiency, post regulation of auxiliary outputs in multiple output-power supplied is provided by connecting a regulating switching device in parallel with a filter inductor connected in the current path from the rectifiers to the output terminal. For minimum output power for that auxiliary output, the switching device is held off at all times. When increased power is required, the switching device is turned on for a short period during each cycle of the inductor voltage. The switching system may be configured to conduct current from the output end of the inductor to the input end of the inductor or vice versa or either one selectively, in accordance with the particular regulation scheme chosen. Efficiency is maximized since current flows in the switching device for only a small portion of each cycle of the inductor voltage.

Abstract: A computer implemented process and apparatus for selecting components of an assembly from input design specifications and displaying the selected component to a system user is provided. The selected components can be displayed in one of many formats including in a bill-of-material format. In one embodiment, the apparatus includes selection means for selecting a component from input design specifications and display means for displaying the selected assembly components.

Abstract: A dual feedback control system for a Class-D power circuit maximizes efficiency by controlling the magnitude and phase angle of the resonant load circuit using two separate feedback loops. The first feedback loop changes the value of a first variable capacitor in response to difference in magnitude between the actual load impedance and the desired load impedance. The second feedback loop changes the value of a second variable capacitor in response to the phase difference between the actual phase angle and the desired phase angle. In this way, the real and imaginary components of the load impedance are controlled so that the Class-D circuit is in tune, and hence efficiency is maximized, over a wide range of load impedances. The dual feedback control of the present invention may be advantageously employed in the ballast of an electrodeless HID lamp system.

Abstract: A voltage-doubler rectifier includes an ac fullbridge diode rectifier and a dc-to-dc converter having two output boost circuits. One of the output boost circuits is coupled between the rectifier and a dc link, and the other output boost circuit is coupled, with opposite polarity, between the rectifier and the circuit common. Two series-connected filter capacitors are also coupled between the dc link and the circuit common. In a preferred embodiment, the two output boost circuits each comprise either a series, parallel, or combination series/parallel resonant circuit and a rectifier. A switch is coupled between the junction joining one pair of diodes of the rectifier and the junction joining the two filter capacitors. For a relatively high ac line voltage, the switch is open, and the circuit operates in a low boost mode. For a relatively low ac line voltage, the switch is closed, and the circuit operates in a high boost, or voltage-doubling, mode.

Abstract: A gram-negative, aerobic, motile, rod-shaped bacterium which is closely related to Chryseomonas luteola and Flavimonas oryzihabitans, has been found to catalyze the biodegradation and biotransformation of bisphenol alkanes, such as 2,2-bis(4-hydroxyphenyl)-propane or bisphenol A. A variety of bisphenol alkyl alcohols can be made by this procedure.

Abstract: A multi-cellular power field effect semiconductor device has compact cells including a heavily doped portion of a body region which is self-aligned with respect to an aperture in the gate electrode. The intercept of this heavily doped portion of the body region with the upper surface of the device may also be self-aligned with respect to the aperture and the gate electrode. A method of producing the device is also disclosed.

Abstract: A simplified method of forming polycrystalline translucent-to-transparent yttria-gadolinia composition scintillators comprises forming an aqueous suspension of hydroxide coprecipitates of the yttria-gadolinia composition, and converting the hydroxides to oxalates. The oxalates are neutralized by washing, dried, and granulated to form a finely dispersed oxalate powder. The oxalate powder is calcined, cold pressed to form a compact, and sintered in a reducing atmosphere or vacuum to form the polycrystalline translucent-to-transparent yttria-gadolinia composition scintillator.

Abstract: .alpha.,.omega.-Bis(guanidinium)alkane salts which contain a heterocyclic nitrogen moiety are prepared by the reaction of a tetraalkyl urea with phosgene or phosphorus oxychloride, or by the reaction of a tetraalkyl thiourea with an N-N-dialkylcarbamoyl halide, to yield a chloroformamideinium salt, followed by reaction of said salt with a monoalkylamine and reaction of the resulting pentaalkylguanidinium salt with an alkylene dihalide. Said salts are useful as phase transfer catalysts.

Abstract: Parallel architectures preprocesses large matrices from digital phased array systems, receiving signals from distant sources, to produce lower order matrices, called pseudo coherent apertures, which are computationally less burdensome. The large matrices are processed by frequency shifting, low pass filtering with an FIR filter, and executing front-end decimation to create the pseudo coherent apertures, each corresponding to different sectors of the spatial frequency spectrum. The pseudo coherent apertures are processed using matrix based superresolution spectral estimation algorithms such as the Tufts-Kumaresan (T-K) reduced rank modified covariance algorithm and the Linear Minimum Free Energy algorithms produce an image of the sources.

Abstract: A phased array antenna system has optical architecture comprising free space delay units and associated spatial light modulators compatible for operation with temporally incoherent or coherent laser light to produce signals having selected time delays to actuate antenna elements of an antenna array to transmit electromagnetic radiation at a selected beam angle from the phase array. The same optical architecture is used to process electromagnetic signals detected by the antenna array to produce an output signal for display or processing which corresponds to the radiation detected at the selected beam angle.

Abstract: A method of forming polycrystalline rare earth oxide ceramic scintillators formed by dissolving a mixture of oxides of the scintillator in an aqueous hydrochloric or nitric acid solution to form a rare earth solution, precipitating oxalates from the rare earth solution, calcining the oxalates to form the respective oxides, cold pressing the oxides to form a compact, and sintering the compact in a reducing atmosphere or vacuum to form the scintillator, the method being improved by precipitating the oxalates by admixing the rare earth solution with an oxalic solution comprised of, oxalic acid and ammonium ions in an amount that disperses the oxalate precipitates.

Abstract: A method for the production of functionalized polyphenylene ether by contacting crude polyphenylene ether with an aqueous base and subsequently adding substituted chlorotriazine such as butyl glycidyl chlorocyanurate or mesityl glycidyl chlorocyanurate.

Abstract: An improved method for the preparation of crosslinked polycarbonates comprises the reaction at elevated temperature of a composition containing cyclic polycarbonate oligomers with at least one polyglycidyl acrylate copolymer formed by the reaction of at least one olefinic compound with a glycidyl acrylate monomer. Further disclosed are network polycarbonates wherein the carbonate chains are linked to each other via polyglycidyl acrylate copolymer groups, and prepreg compositions which comprise a filler and a mixture of cyclic polycarbonate oligomers with a polyglycidyl acrylate copolymer.

Abstract: Ortho ester-capped polyphenylene ethers are prepared by the reaction of a polyphenylene ether with a reactive compound containing an ortho ester group, preferably a 4-(2-methoxy-2-methyl-1,3-dioxolan-4-yl)methyl group. Chlorotriazines containing the ortho ester substituent are particularly preferred as capping agents. The capped polyphenylene ethers form copolymer-containing compositions with polyamides and other polymers containing amine groups, particularly in the presence of a Lewis acid as catalyst.

Abstract: A method is provided for detecting the endpoint of an interfacial aromatic polycarbonate polymerization reaction. The method involves illuminating a sample of the polymerization reaction mixture with a light source and monitoring the extent of apparent light scattering of the sample throughout the course of the polycondensation reaction until at the endpoint, a predetermined threshold extent of apparent light scattering is achieved.

Abstract: Plural-bit digital input signals to be subjected to weighted summation are bit-sliced; and a number N of respective first through N.sup.th weighted summations of the bits of the digital input signals in each bit slice are performed, resulting in a respective set of first through N.sup.th partial weighted summation results. Each weighted summation of a bit slice of the digital input signals is performed using a capacitive network that generates partial weighted summation results in the analog regime; and analog-to-digital conversion circuitry digitizes the partial weighted summation results. Weighted summations of the digitized partial weighted summation results of similar ordinal number are then performed to generate first through N.sup.th final weighted summation results in digital form, which results are respective correlations of the pattern of the digital input signals with the patterns of weights established by the capacitive networks.

Abstract: Built-in test circuitry, which is appropriate for monolithic integrated circuit chips that are to be connected in a plural-chip package, uses electronic token passing to select one of the test input ports in the circuitry to be tested for application of test input vectors. The built-in test circuitry also uses electronic token passing to select one of the test output ports in the circuitry to be tested from which test results are to be supplied.

Abstract: An off-line switching power supply includes an ac rectifier and a dual-output switching converter having one output coupled between the ac rectifier and the input to the dual-output converter in order to provide a high power factor, the other output of the dual-output switching converter providing a dc voltage as the power supply output. The outputs of the dual-output converter are fully decoupled so as to allow independent control of the ac input current and the power supply output voltage. In a preferred embodiment, a full-wave ac rectifier bridge is coupled in series with the second output of the power converter via an input resonant boosting converter. A full-bridge dc-to-ac converter is coupled between the dc link and ground for providing an ac signal to excite the boosting converter and for providing another ac voltage through a transformer to an output rectifier to generate a regulated dc output voltage.