Abstract: A circuit for providing power factor correction comprising a boost converter circuit having a boost inductance and a power factor correction switch coupled in series with the boost inductance, the boost inductance and power factor correction switch being coupled across the output of a rectifier being supplied with AC power from an AC line, the boost converter circuit further comprising a boost diode coupled to a junction between the inductor and the switch, an output of the boost diode coupled to an output capacitor, a DC bus voltage being provided across the output capacitor, further comprising a control circuit receiving as inputs a rectified AC input voltage from the rectifier, a signal proportional to current through the inductor and the DC bus voltage across the capacitor, and wherein the control circuit provides a pulse width modulated signal to control the on time of the PFC switch, further comprising an enable/disable circuit receiving as inputs the rectified AC input voltage and the DC bus voltage, t

Abstract: A circuit for providing power factor correction includes a bridgeless boost converter circuit and a control circuit receiving an input AC line voltage of the bridgeless boost converter circuit, wherein the control circuit provides a pulse width modulated signal to control the on time of a PFC switch of the bridgeless boost converter circuit. The control circuit also includes a scaling device operable to scale down a bi-polar AC voltage of the input AC line voltage to a uni-polar AC voltage, an analog to digital converter operable to convert the uni-polar AC voltage into digital data and a digital rectifier operable to process the digital data of the uni-polar AC voltage to provide a half-sinusoidal AC signal that is proportional to and in phase with the input AC line voltage for use in providing the pulse width modulated signal.

Abstract: A motor drive system control provides global closed loop feedback to cooperatively operate system components to adaptively reduce noise and provide noise cancellation feedback. An active EMI filter reduces differential and common mode noise on an input and provides a noise level indication to a system controller. Power switches in both a power converter and power inverter are cooperatively controlled with dynamic dv/dt control to reduce switching noise according to a profile specified by the controller. The dv/dt control is provided as an analog signal to a high voltage IC and codified as a pulse width for a level shifting circuit supplying control signals to the high voltage gate drive. A noise extraction circuit and technique obtain fast noise sampling to permit noise cancellation and adaptive noise reduction.

Abstract: A motor drive system control provides global closed loop feedback to cooperatively operate system components to adaptively reduce noise and provide noise cancellation feedback. An active EMI filter reduces differential and common mode noise on an input and provides a noise level indication to a system controller. Power switches in both a power converter and power inverter are cooperatively controlled with dynamic dv/dt control to reduce switching noise according to a profile specified by the controller. The dv/dt control is provided as an analog signal to a high voltage IC and codified as a pulse width for a level shifting circuit supplying control signals to the high voltage gate drive. A noise extraction circuit and technique obtain fast noise sampling to permit noise cancellation and adaptive noise reduction.

Abstract: A circuit for providing power factor correction includes a boost converter circuit with a boost inductance and a power factor correction switch and a control circuit. The control circuit provides a pulse width modulated signal to control the on time of a PFC switch, and also includes a power factor correction pulse width modulated device receiving as inputs a rectified AC input voltage, a DC bus voltage, a signal proportional to the current through the inductor and a reference current signal. The power factor correction pulse width modulated device also includes a pulse width modulated generator operable to provide the pulse width modulated signal to control the on time of the PFC circuit and a pulse width modulated blanking device operable to provide an enable/disable signal to disable the pulse width modulated generator when predetermined conditions are met.

Abstract: Disclosed herein are methods and compositions for enhanced protein production and overexpression using engineered zinc finger proteins.

Abstract: When receiving a verification command for verifying a part of the disk array, each of the disks of the disk array are simultaneously verified such that a part of the disk array practically verified is larger than the part assigned to be verified in the verification command, and verification results are recorded. When receiving the next verification command for verifying another part of the disk array, if the part to be verified is already verified, then the recorded verification result is directly returned in response to the present verification command, thus an efficiency of verifying disk arrays can be raised.

Abstract: A multiple access telecommunication system is provided, which makes use of chaotic signals. Each transmitter has a chaotic system, which has at least one strange attractor in its phase space, and each receiver has chaotic systems, which corresponds to those in the transmitters from which it may receive signals. Each pair of users is assigned a set of periodic unstable orbits from a strange attractor, which that pair of users may use for signalling. At the transmitter side, a multiplexer receives data from plurality of users. These data are multiplexed in time, to produce an asynchronous data stream. The data stream is then mapped to a sequence of chaotic signals, in accordance with the set of trajectories for each transmitter and receiver pair.

Abstract: While performing data transfer for reading data from a source disk or disks and writing the read data to disks of a disk array, data reading is repeated until accumulated read data can be split into several sub-data with a data size of each sub-data not smaller than a write maximum. Then, these sub-data are written into the disks of the disk array. In this way, the invention can take full advantage of each writing control to write as much data as possible, and the number of writing controls can be reduced to reduce the demands on the computer system.

Abstract: For error tolerance in a redundant array disks (RAID), a parity data is calculated according to plurality of data respectively accessed in disks of the RAID. A hardware calculation module for parity calculation can be implemented in a RAID controller. With direct memory access (DMA) capability of the RAID controller, the calculation module performs parity calculation by directly accessing a system memory for the plurality of data and the parity data. Thus, memory resources of the parity calculation can be supported by the system memory, and a central processing unit (CPU) can be offloaded during parity calculation.

Abstract: A circuit for providing power factor correction comprising a boost converter circuit having a boost inductance and a power factor correction switch coupled in series with the boost inductance, the boost inductance and power factor correction switch being coupled across the output of a rectifier being supplied with AC power from an AC line, the boost converter circuit further comprising a boost diode coupled to a junction between the inductor and the switch, an output of the boost diode coupled to an output capacitor, a DC bus voltage being provided across the output capacitor, further comprising a control circuit receiving as inputs a rectified AC input voltage from the rectifier, a signal proportional to current through the inductor and the DC bus voltage across the capacitor, and wherein the control circuit provides a pulse width modulated signal to control the on time of the PFC switch, further comprising an enable/disable circuit receiving as inputs the rectified AC input voltage and the DC bus voltage, t

Abstract: A flexible attaching device for attaching a water pump to an aquarium, includes a flexible stem having one end for attaching to the aquarium, and the other end for coupling to a water pump with a coupling device. The coupling device includes a plate attached to the flexible stem for coupling to the water pump with one or more sucker devices. A seat includes a fastener device for detachably attaching to the aquarium, and a coupler is attached to the seat and has a chamber to rotatably receive a ball which is attached to one end of the flexible stem, for allowing the flexible stem and the water pump to be adjusted relative to the seat and the aquarium.

Abstract: Compounds according to formula I wherein m is 0 or 1; X is and R1, R2, R3 R4, and R5 are as defined herein, are useful as anti-infective agents.

Abstract: A digital power control system provides an optimal solution to power supply. The digital power control systems comprises a direct current (DC) power supply; a state configuring device generating a plurality of state signals; a pulse generator connected to the state configuring device, converting the state signals to a plurality of waveform signals; a driving device connected to the DC power supply and the state configuring device respectively, and outputting a driving voltage according to the waveform signal; a transformer connected to the driving device, transforming the driving voltage to an AC operating voltage; and an alternating current (AC) load connected to the transformer; a feedback circuit connected to the AC load; a power detector connected to the feedback circuit for detecting the output power of the AC load, and optimizing the output power by adjusting the waveform signal outputted by the pulse generator.

Abstract: The present invention is directed to absorbent composites comprising superabsorbent materials. The superabsorbent material has: an Absorption Time of about 5+10 a2 minutes or greater, where a is the mean particle size of the superabsorbent material in millimeters; a capacity of about 15 g/g or greater; a Drop Penetration Value of about 2 seconds or less; and, a ½ Float Saturation of 50% or less. The present invention is further directed to fiber-containing fabrics and webs comprising superabsorbent materials and their applicability in disposable personal care products.

Abstract: A RADIUS server is provided with the capability of authenticating a wireless access point whose IP network address has been dynamically allocated. One the wireless access point has received its IP network address on booting a request for authentication is sent to the RADIUS server from a wireless access point. The RADIUS server determines a MAC address, a IP network address, and an authenticator from the request. The MAC address is used to determine a shared secret which is used to verify the message attribute authenticator for the request, which is used for verifying both addresses. The method and apparatus can be applied to other AAA server protocols, for example Diameter protocol.

Abstract: An OFDM wireless transceiver uses a digital automatic gain control (AGC) module. The digital AGC module is configured for setting a gain to an initial gain value for mapping a received wireless signal to a first power value for an input circuit having a prescribed input range. The initial gain value is set relative to the prescribed input range and a prescribed signal to noise ratio. If the digital AGC module determines that the first power value of the received wireless signal does not exceed the prescribed input range, the digital AGC module calculates an optimum gain for the received wireless signal relative to the initial gain value and the first power value; if the first power value exceeds the prescribed input range, the AGC module determines the optimum gain based on setting the gain to a minimum gain value.

Abstract: Wireless data services such as wireless email are becoming common, and in particular, “always-on” systems, where new email is automatically forwarded by the service provider to the wireless device. The problem is that there is no effective mechanism for implementing “always-on” systems when the user is moving around a network, or from one network to another. The invention addresses this problem by generating a session key at the service provider's system for a given data session, and returning this session key to the mobile device. Each time the mobile device communicates with the service provider, it enters this session key into a field that will simply pass through the communication network to the service provider. This allows the service provider to manage the data session, preparing proper accounting records and directing the deletion of stale data sessions on network resources.

Abstract: The invention is a process for preparing an imidazole of formula I 1

Abstract: A method of preparing a nonwoven web that has substantially continuous synthetic fine fiber includes preparing an aqueous amide crosslinked polymer solution. The solution is extruded through a die having a plurality of orifices to form a plurality of threadlines. The threadlines are then attenuated with a primary gaseous source under conditions sufficient to permit the viscosity of each threadline to increase incrementally with increasing distance from the die, at a rate sufficient to provide fibers having a desired attenuation and mean fiber diameter without significant fiber breakage.