Abstract:
A system for implementing accurate V/Hz value measurement and trip time determination for generator/transformer overexcitation protection independent of the conventional frequency tracking and phasor estimation based on Discrete Fourier Transformation (DFT) techniques. The half-cycle summation technique of the invention is a non-recursive digital technique which measures the per unit V/Hz value by summing the sampled data points in every half cycle of a sinusoidal input signal and dividing the sum with the ideal base sum value. When the input voltage signal is sampled at a reasonable frequency, the technique of the invention approximates the accurate per unit V/Hz value of the input voltage signal and thus obtains an accurate V/Hz characteristic directly without computing voltage and frequency separately.
Abstract:
An ozone generator is contained in a housing having a fan for inducing air flow through the housing and over an ozone generating plate where atmospheric oxygen is electrochemically converted to ozone, which flows out of the housing through a grid opening. The ozone generating plate is defined by a glass plate having electrically conductive grids on both sides thereof and each grid is electrically powered to create corona discharge from the conductor; as air and oxygen in the air flows over the plate it is converted to ozone.
Abstract:
Systems and methods are provided for storing and restoring digital data. A method includes receiving, a first user input requesting that a backup interface be displayed, displaying the backup interface, the backup interface including a display area for presenting at least a first visual representation of an earlier version of a current view and a visual representation of the current view, the earlier version including a first element, receiving, while the backup interface is displayed, a second user input requesting that the current view be modified according to the earlier version, at least with regard to the first element, animating the modification of the first element as moving from the visual representation of the earlier version to the visual representation of the current view, and modifying, in response to the second user input, the current view according to the earlier version, at least with regard to the first element.
Abstract:
An apparatus and system that efficiently and effectively delivers a sanitizing fluid to ducts in the form of a fog or mist is described. A canister that contains a liquid sanitizing solution is attached to a compressor and includes a straw that has an internal passageway that extends into the liquid and a venturi tube above the level of the liquid that connects with the internal passageway in the straw. The headspace above the liquid in the canister is pressurized, causing fluid to flow upwardly in the straw when a trigger is depressed, drawing fluid upwardly in part by the venturi. As the liquid passes the venturi the pressurized air that is flowing into the venturi causes the fluid to form a fine mist. The mist, under pressure from the compressor, is routed into a flexible delivery tube that has been previously positioned in a duct system. The terminal end of the tube has an atomizing ball attached thereto and the atomizing ball has a series of orifices through which the misted, atomized fluid is delivered. As fogged sanitizing solution flows through the orifices it is deposited on the interior surfaces of the duct. The delivery tube and the attached atomizing ball are withdrawn from the duct as the sanitizing fog is emitted from the ball. The fan in the HVAC system is not activated so there is no deliver of the sanitizer through registers and into the living space. The apparatus and method may be used to apply other fluids to other surfaces.
Abstract:
Systems and methods for navigating within snapshots are provided. In one implementation a method is provided. The method includes receiving, while a current view is displayed in a user interface, a first user input requesting that a history view associated with the current view be displayed. The history view is displayed in response to the first user input, the history view including at least a first visual representation of an earlier version of the current view, the earlier version including a hierarchical structure wherein a first element of the earlier version includes a second element. There is received, while the history view is displayed, a second user input requesting that the current view be modified according to the second element. The method includes modifying, in response to the second user input, the current view according to the second element.
Abstract:
Systems and methods are provided for storing and restoring digital data. A method includes receiving, a first user input requesting that a backup interface be displayed, displaying the backup interface, the backup interface including a display area for presenting at least a first visual representation of an earlier version of a current view and a visual representation of the current view, the earlier version including a first element, receiving, while the backup interface is displayed, a second user input requesting that the current view be modified according to the earlier version, at least with regard to the first element, animating the modification of the first element as moving from the visual representation of the earlier version to the visual representation of the current view, and modifying, in response to the second user input, the current view according to the earlier version, at least with regard to the first element.
Abstract:
Systems and methods are provided for storing and restoring digital data. In some implementations, a method is provided. The method includes displaying a current view, initiating a history view, the history view including two or more visual representations of corresponding earlier versions of the current view, identifying a selection of an item in a visual representation, receiving an input to delete the selected item, and deleting each instance of the selected item in the history view. Other embodiments of this aspect include corresponding systems, apparatus, computer program products, and computer readable media.
Abstract:
A computer implemented method, data processing system, and computer program product for maximizing the amount of data protected in a Redundant Array of Independent Disks (RAID) storage system. When a request to configure a plurality of physical disk drives into a Redundant Array of Independent Disks is received, each of the plurality of physical disk drives is divided into blocks of data based on a least common denominator. The blocks of data are then arranged to form valid Redundant Array of Independent Disks parity sets, thereby maximizing the amount of data protected in the Redundant Array of Independent Disks.
Abstract:
This invention provides a method and system for distributing multiband wireless communications signals. Downlink RF signals in a plurality of downlink frequency bands are received and then combined into a combined downlink RF signal at the main unit. The combined downlink RF signal is subsequently split into multiple downlink RF-parts, which are converted to multiple downlink optical signals and optically transmitted to the remote units. At each remote unit, a delivered downlink optical signal is first converted back to a downlink RF-part which is subsequently separated into a plurality of downlink RF-groups by frequency band. Each downlink RF-group is individually conditioned (e.g., filtered and amplified). The individual-conditioned downlink RF-groups are then combined and transmitted to a dedicated downlink antenna.
Abstract:
A fault is located in a transmission line with a sending end, a receiving end, and a plurality of tapped nodes, and multiple tapped loads connected to the transmission line at tap nodes. The sending end and the receiving end each include a measuring device. The fault location is determined by obtaining measured circuit parameters including measured pre-fault and faulted current and voltage values at the sending end and at the receiving end of the transmission line. An equivalent tap node location is calculated using measured pre-fault and faulted current and voltage values at the sending end and at the receiving end of the transmission line. The equivalent tap node divides the transmission line into a sending side and a receiving side. The phase angle difference due to unsynchronized measurement using the measured pre-fault current and the measured pre-fault voltage values may be calculated. The equivalent load impedance of the tapped loads is calculated. A first fault location is calculated assuming that the fault is located on the sending side of the equivalent tap node. A second fault location is calculated assuming that the fault is located on the receiving side of the equivalent tap node. The fault location is selected from one of the first fault location and the second fault location, by selecting the fault location having a value within a predetermined range representing a full distance between two nodes.