Abstract: The present disclosure relates to an airfoil assembly for a turbine engine and methods of assembly thereof. The airfoil assembly generally includes a composite airfoil and a spar. The composite airfoil has a pressure side and a suction side extending in an axial direction between a leading edge and a trailing edge defining a chordwise direction and extending radially between a root and a tip defining a spanwise direction and having a span-length. The spar includes a first portion including a first material and a second portion joined at an interface with the first portion. The second portion further includes a second material, different from the first material, joined to the first portion at an interface. The method generally includes joining the first portion with the second portion at the interface; and assembling the spar with the composite airfoil.

Abstract: A method of determining battery degradation retroactively using historical data is disclosed. The method includes the steps of collecting state of charge (SOC) and DC ampere data for a predetermined time period; determining a delta (?) SOC based on the data collected; creating a set of SOC regimes having a size based on ?SOC; filtering the SOC data and determining a set of points which indicate a charging or discharging event; and calculating overall Coulombs associated with each charging or discharging event and for each event, producing a timestamp and Coulombs associated with each event.

Abstract: A method of determining battery degradation retroactively using historical data is disclosed. The method includes the steps of collecting state of charge (SOC) and DC ampere data for a predetermined time period; determining a delta (?) SOC based on the data collected; creating a set of SOC regimes having a size based on ?SOC; filtering the SOC data and determining a set of points which indicate a charging or discharging event; and calculating overall Coulombs associated with each charging or discharging event and for each event, producing a timestamp and Coulombs associated with each event.

Abstract: Systems and methods for protecting a series capacitor bank are provided. According to one exemplary embodiment of the invention, there is disclosed a capacitor protection circuit. The capacitor protection circuit may include a capacitor bank, a pilot circuit and a main commutation gap. The pilot circuit and the main commutation gap may be provided in parallel electrical communication with the capacitor bank. Additionally, one or more plasma injectors may be provided in series electrical communication with the pilot circuit. The plasma injectors may be operable to provide partially or completely ionized plasma across the main commutation gap to make conductive the main commutation gap.

Abstract: Systems and methods for protecting a series capacitor bank are provided. According to one exemplary embodiment of the invention, there is disclosed a capacitor protection circuit. The capacitor protection circuit may include a capacitor bank, a pilot circuit and a main commutation gap. The pilot circuit and the main commutation gap may be provided in parallel electrical communication with the capacitor bank. Additionally, one or more plasma injectors may be provided in series electrical communication with the pilot circuit. The plasma injectors may be operable to provide partially or completely ionized plasma across the main commutation gap to make conductive the main commutation gap.

Abstract: A roof support for an underground mine which has a hydraulic cylinder positioned between a roof engaging support and a ground engaging base and has a flexible gas barrier or enclosure surrounding surfaces of said hydraulic cylinder which are subject to corrosion by gases present in the underground mine. Continuous flowing non-corrosive gas such as nitrogen is supplied to a space between the gas barrier and the hydraulic cylinder for preventing corrosion of cylinder surfaces by corrosive gases present in the mine which may include hydrogen sulfide.

Abstract: A method for detecting loss of SF6 gas from electrical utility apparatus determines a molar ratio of gas in a container at an initial time and of gas in the container at a subsequent time. Measurement of temperature is determined by averaging ambient temperature and temperature of the surface of the container. The initial values of pressure and temperature define the initial value of n as follows: no=Pgas o/Tgas o The value at a subsequent time is nn=Pgas n/Tgas n The molar ratio can be defined as nn/no or as no/nn.

Abstract: A communication device (1) comprising a receiver (2) for receiving coded messages transmitted on one or more channels. There is a micro-processor (13), in communication with the receiver (2) and a frequency synthesizer (4) coupled to both the micro-processor (13) and the receiver (2) to thereby control reception of the channels. The communication device (1) also has a memory (14) storing a group of-channel frequencies, wherein the micro-processor (13) is adapted, in combination with the frequency synthesizer (4), to control the receiver (2) to scan at least some of the channels during baud detect periods of a protocol cycle associated with at least one of the channels. Further, the micro-processor (13) cyclically offsets a start of the baud detect periods after completion of a protocol cycle.

Abstract: A method and apparatus are provided for configurable logging and analysis of performance data for a medical diagnostic imaging system. A medical diagnostic imaging system may be divided into at least one subsystem. The subsystems include data acquisition modules for acquiring desired types of data related to the performance of an associated subsystem. The data acquisition modules acquire raw performance data during the operation of the medical diagnostic imaging system. The data acquisition modules may remotely acquire the raw performance data. The raw performance data may be acquired based upon a configuration file which identifies parameters associated with a desired type of performance analysis. New configuration files may be downloaded to dynamically select at least one parameter for a desired type of performance analysis. Parameters in the configuration file may comprise at least one of a performance variable and a sampling rate for the performance variable.

Abstract: A method by which a data communication receiver may recognize a specific channel comprises the steps of receiving (1605) a data stream on a first channel for a first amount of time to determine (1680) whether network identification information is included in the data stream received on the first channel, wherein the network identification information comprises at least one address assigned to represent a network. If the network identification information is not included in the data stream received on the first channel within the first amount of time, reception is switched (1614) to receive (1605) a data stream on a second channel. The method further comprises the step of receiving (1605) the data stream on the second channel for a second amount of time to determine (1680) whether the network identification information is included in the data stream received on the second channel.

Abstract: A method and apparatus select a receive frequency of a receiver (400) in a system having coverage areas divided into zones. A primary scan list is stored in the receiver (400) and contains coverage area identification parameters. The list is initially ordered from a most frequented coverage area at the top to a least frequented coverage area at the bottom. The parameters can include a coverage area identifier and a zone identifier, and at least one corresponding frequency identifier. A frequency identifier is chosen (604) from the top of the list and the receiver (400) is tuned to the receive frequency identified thereby. Baud rate detection is performed (608) and, in response to finding a predetermined baud rate, a received coverage area identifier and/or a received zone identifier is decoded (612). If the received identifier matches a corresponding parameter stored in the receiver, the receiver (400) is locked (904) to a signal on the receive frequency.

Abstract: The present invention is a scissor assembly adapted to be in an open or closed position and to be manipulated by a user to cut a selected material. The scissors assembly includes a first scissors member and a second scissors member pivotally connect and biased into the open position. The first scissor member has a handle and a blade. The first handle is formed as an enlarged and elongated shaft sized to fit in a user's palm and be gripped by the fingers, the second scissor member likewise, has a handle and a blade. The second handle has a portion which defines a lever sized to be manipulated by the thumb when the first handle portion is fit in the user's palm and gripped by the user's fingers. In the preferred embodiment, the first handle is formed as a releasable container and the second handle is foreshortened relative to the first handle. In the alternative embodiments, the first handle is formed of implements such as a screw-driver, flashlight or pliers.

Abstract: A split-E mechanism is provided for use on a flute having a right-hand steel, a left-hand steel, a first hinge rotatably mounted on the right-hand steel, a first key coupled to the first hinge, a second hinge rotatably mounted on the left-hand steel, and a second key. The split-E mechanism includes an actuator for actuating the second key in response to rotation of the second hand relative to the left-hand steel. The mechanism also includes a bridge device for interconnecting the first and second hinges for rotating the second hinge in response to actuation of the first key to operate the actuator.

Abstract: Group call capability is provided as for a digital pager having a two word page address and using asynchronous detection. A group call is initiated by transmitting two identical binary words having an extra bit space between them, the binary word being word one of the individual paging address of each unit in the group to be called.

Abstract: An improved detection arrangement for detecting the presence of a given tone in a received input signal. A reference generator, in the form of a reference clock and a programmable divider, produces a first reference frequency, equal to the frequency of the tone, and at an arbitrary phase angle thereto. A second generator output is in quadrature to the first. Each reference signal is product detected with the input signal via exclusive OR gates.A unique digital low pass filter, operating in a time multiplex mode, receives the gate outputs, removes all high frequency components therefrom, and produces pairs of output binary number encoded signals, each of which is representative of a vector component of a detected tone. Threshold detector circuitry monitors the outputs indicating an above threshold condition at its output in response to predetermined combinations of the binary numbers. The combinations represent all input vectors whose resultant absolute magnitude exceeds a chosen threshold.