Abstract: A power conversion apparatus, such as an uninterruptible power supply (UPS), includes an input port, an output port, and first and second busses. An output circuit, for example, a half-leg inverter, is coupled to the first and second busses and to the output port and operative to transfer power therebetween. An auxiliary DC voltage generator circuit, for example, a battery converter circuit, is operative to generate DC voltages on the first and second busses. A multifunction rectifier circuit is coupled to the input port and to the first and second busses, the multifunction rectifier circuit operative to generate DC voltages on the first and second busses from an AC power source at the input port when the apparatus is operating in a first mode (e.g., an AC powered operational mode). The multifunction rectifier circuit is operative to control relative magnitudes of the DC voltages generated by the auxiliary DC voltage generator circuit when the apparatus is operating in a second mode (e.g.

Abstract: The present disclosure describes a biologically active modified urokinase and high resolution crystalline forms of modified urokinase. Polynucleotides which encode modified urokinase and methods for making modified urokinase are also disclosed.

Abstract: An uninterrupted power supply (UPS) device with uninterrupted neutral from input to output utilizes the same converter for converting rectified AC power and battery power to positive and negative high voltage (HV) rails. A simple circuit is utilized for connecting the battery to the conversion components of the PFC circuit without adverse affect on the performance of the PFC circuit, and while holding the battery substantially connected to neutral. In a first embodiment, the circuit comprises a simple combination of four diodes and a pair of high pass capacitors arranged so that in both power line and battery supply modes the battery is balanced around neutral. In a second, preferred embodiment, one terminal of the battery is connected directly to neutral.

Abstract: A power converter includes first and second voltage busses and a neutral bus. A first switching circuit, e.g., a rectifier circuit, is operative to selectively couple an input node thereof to the first and second voltage busses. A balancer circuit is operative to selectively couple the neutral bus to the first and second voltage busses such that relative magnitudes of respective first and second voltages on the first and second voltage busses are controlled responsive to respective first and second rates at which the balancer circuit couples the first and second voltage busses to the neutral bus. A second switching circuit, e.g., an inverter circuit, is operative to selectively couple the first and second voltage busses to a load connected at an output node thereof.

Abstract: An apparatus for mounting a component in a computer includes a computer chassis and a mounting bracket assembly attached to the computer chassis. The mounting bracket assembly includes a first structural layer, a second structural layer spaced apart from the first structural layer wherein a gap is defined therebetween, and a layer of damping material disposed in at least a portion of the gap. The mounting bracket assembly is useful in space-sensitive applications while still providing vibration and acoustical noise attenuation. Furthermore, the mounting bracket assembly provides a nominal degree of impact damping during installation of a system component, reducing the potential for impact related failures.

Abstract: An apparatus including a base substrate including a reference voltage plane. A plurality of spaced apart printed circuit substrates are attached to the base substrate. Each one of the printed circuit substrates includes a reference voltage plane attached to the reference voltage plane of the base substrate. A system component is removably attached to a first side of at least one of the printed circuit substrates. The system component is electrically connected to the reference voltage plane of the printed circuit substrate. A support member is attached to a second side of each printed circuit substrate. Each support member is electrically coupled to the reference voltage plane of the printed circuit substrate. The support members are electrically connected to a reference voltage plane of the printed circuit substrate to provide a low impedance return current path for the electrical portion of the electromagnetic emissions, thereby reducing the magnitude of electromagnetic emissions.

Abstract: An apparatus including a base substrate and a plurality of spaced apart end brackets attached to the base substrate. A plurality of spaced apart side panel assemblies are removably mounted between a mounting portion of each end bracket. A first edge of each side panel assembly positioned adjacent to the base substrate. A shroud is pivotally attached to each one of the side panel assemblies adjacent to a second edge of the respective side panel assembly. Each shroud is movable about a pivot axis between an open position and a closed position with respect to the respective side panel assembly. A shroud engaging portion is attached to each end bracket adjacent to each shroud. A engagement member of each shroud engages a corresponding shroud engaging portion when the respective shroud is moved from the open position to the closed position for moving the respective printed circuit substrate from an inserted position to a seated position with respect to the base substrate.

Abstract: An apparatus includes a base substrate and a plurality of spaced apart end brackets attached to the base substrate. A pivotable one of the end brackets is movable between a retracted position and an extended position with respect to the base. A plurality of spaced apart side panel assemblies are removably mounted between each end bracket when the pivotable one of the end brackets is in the extended position. A first edge of each side panel assembly is positioned adjacent to the base substrate. A shroud assembly extends between the two side panel assemblies adjacent to a second edge of each side panel assembly. The shroud assembly, the base substrate and the side panel assemblies define an air duct. A fan is mounted adjacent to at least one of the end brackets for directing air through the air duct. The part count of the apparatus is reduced such that cost and assembly time are also reduced.

Abstract: An uninterrupted power supply (UPS) device with uninterrupted neutral from input to output utilizes the same converter for converting rectified AC power and battery power to positive and negative high voltage (HV) rails. A simple circuit is utilized for connecting the battery to the conversion components of the PFC circuit without adverse affect on the performance of the PFC circuit, and while holding the battery substantially connected to neutral. In a first embodiment, the circuit comprises a simple combination of four diodes and a pair of high pass capacitors arranged so that in both power line and battery supply modes the battery is balanced around neutral. In a second, preferred embodiment, one terminal of the battery is connected directly to neutral.

Abstract: An uninterrupted power supply (UPS) device with uninterrupted neutral from input to output utilizes the same converter for converting rectified AC power and battery power to positive and negative high voltage (HV) rails. A simple circuit is utilized for connecting the battery to the conversion components of the PFC circuit without adverse affect on the performance of the PFC circuit, and while holding the battery substantially connected to neutral. In a first embodiment, the circuit comprises a simple combination of four diodes and a pair of high pass capacitors arranged so that in both power line and battery supply modes the battery is balanced around neutral. In a second, preferred embodiment, one terminal of the battery is connected directly to neutral.

Abstract: A power converter includes first and second voltage busses and a neutral bus. A first switching circuit, e.g., a rectifier circuit, is operative to selectively couple an input node thereof to the first and second voltage busses. A balancer circuit is operative to selectively couple the neutral bus to the first and second voltage busses such that relative magnitudes of respective first and second voltages on the first and second voltage busses are controlled responsive to respective first and second rates at which the balancer circuit couples the first and second voltage busses to the neutral bus. A second switching circuit, e.g., an inverter circuit, is operative to selectively couple the first and second voltage busses to a load connected at an output node thereof.

Abstract: A power converter includes first and second voltage busses and a neutral bus. A first switching circuit, e.g., a rectifier circuit, is operative to selectively couple an input node thereof to the first and second voltage busses. A balancer circuit is operative to selectively couple the neutral bus to the first and second voltage busses such that relative magnitudes of respective first and second voltages on the first and second voltage busses are controlled responsive to respective first and second rates at which the balancer circuit couples the first and second voltage busses to the neutral bus. A second switching circuit, e.g., an inverter circuit, is operative to selectively couple the first and second voltage busses to a load connected at an output node thereof.

Abstract: An uninterruptible power supply (UPS) includes an AC source port configured to connect to an AC power source, a DC source port configured to connect to a DC power source and a load port configured to connect to a load. A rectifier circuit is operative to selectively couple the AC source port to first and second voltage busses through a first inductance. An inverter circuit is operative to selectively couple the load port to the first and second voltage busses through a second inductance. A bidirectional DC source coupling circuit is operative to couple the DC source port to the first and second voltage busses to provide bidirectional power transfer therebetween, preferably such that a voltage at the DC source port is maintained in a substantially fixed proportion to first and second DC voltages at respective ones of the first and second voltage busses.

Abstract: An uninterrupted power supply (UPS) device with uninterrupted neutral from input to output utilizes the same converter for converting rectified AC power and battery power to positive and negative high voltage (HV) rails. A simple circuit is utilized for connecting the battery to the conversion components of the PFC circuit without adverse affect on the performance of the PFC circuit, and while holding the battery substantially connected to neutral. In a first embodiment, the circuit comprises a simple combination of four diodes and a pair of high pass capacitors arranged so that in both power line and battery supply modes the battery is balanced around neutral. In a second, preferred embodiment, one terminal of the battery is connected directly to neutral.

Abstract: A method and apparatus for calculating fast Fourier transforms FFTs. An FFT of a given size is formatted using tensor product principles for implementation in apparatus or by software such that the same reconfigurable hardware or software can calculate FFTs of any dimension for the selected FFT size. The FFT is factored into an input permutation and successive stages for computing tensor products of dimensionless Fourier transforms of a relatively small base size and twiddle factors, with load-stride permutations between computation stages. The basic building blocks of the circuitry can be reconfigurable for maximizing use-flexibility of the hardware or software. Examples of digital circuit apparatus configured to compute dimensionless formatted FFTs are presented.

Abstract: An appliance for cooking foodstuffs includes an electric grill plate adapted for use atop a horizontal table top surface, a plate component of the electric grill plate, and a frustum-shaped cooking surface on the plate component that slopes downwardly in all horizontal directions from a central vertical axis in order to promote drainage from foodstuffs during cooking.

Abstract: An apparatus and method for simultaneously testing a plurality of optical fibers, preferably using optical time domain reflectometry, wherein the apparatus includes a light source for providing a pulse of light, at least one splitter means positioned for receiving the pulse of light and for splitting the pulse of light into at least two substantially identical pulses of light, and a plurality of coupling means, each connected to one of the optical fibers under test and each positioned for receiving one of substantially identical pulses of light and directing that pulse of light into an optical fiber. In a preferred embodiment, the backscattered signals from the optical fibers are directed back through the coupling means to a plurality of receivers and data averagers.

Abstract: A storage container comprising an outer shell and an insertable drawer member configured and dimensioned for receiving and storing information-bearing discs and accompanying printed matter. The insertable drawer member includes features to store the discs by contacting non-information bearing surfaces thereof as well as means for selectively retrieving the printed matter together with the disc from the outer shell. The drawer includes a top segment and a bottom segment that are hinged together. The bottom segment has outwardly extending flexible side walls with respect to the bottom segment.

Abstract: A storage container comprising an outer shell and an insertable drawer member configured and dimensioned for receiving and storing information-bearing discs and accompanying printed matter. The insertable drawer member includes features to store the discs by contacting non-information bearing surfaces thereof as well as means for selectively retrieving the printed matter together with the disc from the outer shell. The container of the invention additionally comprises a tamper seal formed integral therewith which fractures the first time the drawer member is withdrawn from the shell for determining whether the storage container has ever been opened to access its contents after it was sealed at the factory.