Abstract: A fluid compressor includes a housing; a compression chamber within the housing; a motor; a shaft that is rotated by the motor; and a piston assembly including at least two pistons directly connected to each other without any connecting rods. The piston assembly performs a reciprocating motion when acted on by the shaft such that the at least two pistons move within the compression chamber to compress a fluid.

Abstract: A prefabricated column assembly includes a hollow tubular column having a longitudinal axis. A gusset plate assembly includes a plurality of gusset plates connected to the column and extending laterally outward from the column in planes generally parallel to the longitudinal axis of the column. A first pair of the gusset plates extends laterally outward from the column along a first axis and defines a space for receiving an end portion of a first beam for mounting the first beam on the first pair of gusset plates. A second pair of the gusset plates extends laterally outward from the column along a second axis that is nonparallel and non-coincident with the first axis. The second pair of gusset plates defines a space for receiving an end portion of a second beam for mounting the second beam on the second pair of gusset plates to provide a bi-axial joint connection.

Abstract: A controller node in a network implementing software defined networking (SDN) proactively detects network overload conditions in a target node and subsequently prevents the conditions from developing by launching a new virtual network node. The detection and prevention are based on the determination of a probability of failure of the target node as a weighted function of information from the target node and probabilities of failure of related nodes.

Abstract: A controller node in a network implementing software defined networking (SDN) proactively detects network overload conditions in a target node and subsequently prevents the conditions from developing by launching a new virtual network node. The detection and prevention are based on the determination of a probability of failure of the target node as a weighted function of information from the target node and probabilities of failure of related nodes.

Abstract: A controller node in a network implementing software defined networking (SDN) proactively detects network overload conditions in a target node and subsequently prevents the conditions from developing by launching a new virtual network node. The detection and prevention are based on the determination of a probability of failure of the target node as a weighted function of information from the target node and probabilities of failure of related nodes.

Abstract: Apparatus and method for rake receiving in a quadrature bandpass-sampling RF receiver is provided. The receiver bandpass-samples and quantizes an RF signal to provide an in-phase bi-level digital signal based on an in-phase clock and a quadrature bi-level digital signal based on a quadrature clock. The in-phase clock frequency and the quadrature clock frequency are equal to the RF signal carrier frequency. The quadrature clock is ninety degree out of phase with respect to the in-phase clock. The delayed bits in both the in-phase digital signal group and the quadrature digital signal group are maximal-ratio combined to provide diversity gain.

Abstract: A multi-channel quadrature bandpass-sampling receiver is provided with a plurality of RF signals that are modulated at different carrier frequencies, are frequency-shifted, and are staggered to a first IF frequency. A quadrature bandpass-sampling analog-to-digital demodulator digitizes and down-converts the aggregate RF signals to a second low IF frequency, wherein each frequency-shifted RF signal can be demodulated to DC by a digital down converter.

Abstract: A calibration technique to compensate for the phase error between the in-phase and quadrature sampling clocks controlling the quadrature bandpass sampling delta-sigma analog-to-digital demodulator (QBS-ADD) is provided. A low-frequency test tone is injected, up-converted to the RF frequency, and added to an input of the QBS-ADD. The test tone is demodulated by the QBS-ADD into an in-phase signal and a quadrature signal. The in-phase and quadrature signals are filtered and multiplied together to generate a phase error signal, which is subsequently integrated to generate a phase shift control signal being used to correct the phase error between the in-phase and quadrature sampling clocks.

Abstract: A quadrature bandpass-sampling radio frequency (RF) receiver is provided. The receiver bandpass-samples and quantizes an RF signal to provide an in-phase bi-level digital signal based on an in-phase clock and a quadrature bi-level digital signal based on a quadrature clock. The in-phase clock frequency and the quadrature clock frequency are equal to the RF signal carrier frequency. The quadrature clock is ninety degree out of phase with respect to the in-phase clock.

Abstract: Apparatuses for composing LC resonators in a continuous-time RF bandpass delta-sigma modulator are provided. A plurality of resonator inductors are shaped and strategically positioned on an integrated circuit die to minimize the resonant couplings. The resonator inductors can be also constructed from pairs of bond wires connected to a ground paddle, or to a set of lead frame pins. The inductance in each resonator can be increased by appending a specifically shaped planer inductor constructed from the PCB metal track to the bond wire pair via two lead frame pins.

Abstract: A quadrature bandpass-sampling receiver for an orthogonal frequency division multiplexing (OFDM) receiver is provided. A transmitted OFDM signal is received by a low-noise amplifier, has its image frequency removed by a subsequent image reject filter, and is frequency-translated to an intermediate frequency by a mixer. A quadrature bandpass-sampling delta-sigma analog-to-digital demodulator (QBS-ADD) down-converts the frequency-translated OFDM signal to baseband based on a high-frequency sampling clock equal to the intermediate frequency, and generates in-phase and quadrature outputs in the form of high-frequency bit streams. The bit streams are fed to a Discrete Fourier Transform (DFT) engine, which generates in-phase and quadrature Fourier components.

Abstract: A calibration technique to compensate for the quadrature phase error between the in-phase and quadrature sampling clocks controlling the quadrature bandpass sampling delta-sigma analog-to-digital demodulator (QBS-ADD) is provided. A low-frequency test tone is injected in the feedback path, up-converted to the radio frequency (RF) frequency, and added to the input of the QBS-ADD. The test tone is demodulated by the QBS-ADD into an in-phase signal and a quadrature signal. The in-phase and quadrature signals are converted into the frequency domain by the discrete Fourier transform. The quadrature phase error is quantified based on the complex Fourier complex coefficients; and the phase difference between the in-phase and quadrature sampling clocks is corrected.

Abstract: A quadrature bandpass-sampling receiver providing time diversity for OFDM is provided. A quadrature bandpass-sampling analog-to-digital demodulator down converts an OFDM signal in the RF frequency range to baseband based on a high-frequency sampling clock equal to the RF frequency and generates the in-phase and quadrature outputs in form of high-frequency bit streams. The period of the bit stream is the inverse of the OFDM carrier frequency, which is much higher than the OFDM symbol rate, allows usage of multipath diversity to improve the communication link.

Abstract: A wide-frequency band quadrature bandpass-sampling receiver is provided. An RF signal received at the antenna is amplified by an LNA and filtered by an image-reject filter. The filtered RF signal is then frequency-shifted to an intermediate frequency which is located in between 1 GHz to 4 GHz. A quadrature bandpass-sampling analog-to-digital demodulator down-converts and digitizes the frequency-shifted signal at the intermediate frequency to baseband yielding a bi-level in-phase component and a bi-level quadrature component.

Abstract: A power line de-icing apparatus which is installed onto a power line without the need for disconnecting the power line. A temperature sensor and an ice sensor on the apparatus automatically activate the de-icing mode of operation. An internal motor and drive wheel move the apparatus along the power line in both directions, one direction at a time. Heaters and chisels on the apparatus remove any ice on the power line in one direction at a time. Power for the apparatus is generated from the electrical power carried by the power line using transformers. Proximity sensors on the apparatus detect stopping devices placed on the power line to stop the motion of the apparatus.

Abstract: A telecommunications system including a plurality of switches defining an Ethernet ring; a plurality of virtual local area networks defined on the Ethernet ring, defining a number of virtual local area networks (VLANs) equal in number to the number of links; and a ring recovery system configured to recover from a link failure by rerouting traffic to a destination on the Ethernet ring via a VLAN not including a failed link.

Abstract: A power line de-icing apparatus which is installed onto a power line without the need for disconnecting the power line. A temperature sensor and an ice sensor on the apparatus automatically activate the de-icing mode of operation. An internal motor and drive wheel move the apparatus along the power line in both directions, one direction at a time. Heaters and chisels on the apparatus remove any ice on the power line in one direction at a time. Power for the apparatus is generated from the electrical power carried by the power line using transformers. Proximity sensors on the apparatus detect stopping devices placed on the power line to stop the motion of the apparatus.

Abstract: A telecommunications system including a plurality of switches defining an Ethernet ring; a plurality of virtual local area networks defined on the Ethernet ring, defining a number of virtual local area networks (VLANs) equal in number to the number of links; and a ring recovery system configured to recover from a link failure by rerouting traffic to a destination on the Ethernet ring via a VLAN not including a failed link

Abstract: A mobile integration engine application services component for accessing data and information stored in at least one multi-dimensional database and for presenting the accessed data and information to a browser-based application. The mobile integration engine application services component reads and translates the data and information, which includes data and information relating to critical business metrics as well as the data relational rules that govern the relationship of the data, and then creates markup language describing the accessed data and information for presentation to the browser-based application. An orthogonal drill mechanism creates a “drill-across” path from a first dimension to any other orthogonal dimension having a related dimension measure, allowing navigation between the orthogonal dimensions.

Abstract: Systems and methods of automatic data search to determine compliance with international standard are disclosed here. One embodiment includes automatically searching through data of an organization for predetermined data to determine if the organization is compliant with an international standard and generating a score based on data identified from the search, the score to indicate a compliance level of the organization based on a predetermined scale of the international standard.