Abstract: A computer-implemented method controls input of at least a portion of a first training data set into a first machine learning algorithm. The first training data set includes data quantifying damage to a first compressor and data quantifying a first operating parameter of the first compressor. The first machine learning algorithm is executed, and data quantifying the first operating parameter is received as an output of the first machine learning algorithm. The first machine learning algorithm is trained using the received data output from the first machine learning algorithm and data quantifying the first operating parameter of the first compressor. The trained first machine learning algorithm is configured to enable determination of operability of a second compressor of a gas turbine engine.

Abstract: A computer-implemented method comprising: controlling input of data quantifying damage received by a compressor of a gas turbine engine into a first machine learning algorithm; receiving data quantifying a first operating parameter of the compressor as an output of the first machine learning algorithm; and determining operability of the compressor by comparing the received data quantifying the first operating parameter of the compressor with a threshold.

Abstract: A computer-implemented method comprising: controlling input of data quantifying damage received by a compressor of a gas turbine engine into a first machine learning algorithm; receiving data quantifying a first operating parameter of the compressor as an output of the first machine learning algorithm; and determining operability of the compressor by comparing the received data quantifying the first operating parameter of the compressor with a threshold.

Abstract: Apparatuses that include a nozzle, vacuum units, and vacuum trucks for excavating material, for instance, around buried utility lines. Multiple embodiments include an (e.g., air and water) nozzle, for instance, that breaks up material (e.g., earth) that is picked up with vacuum. Various embodiments include vacuum, compressed air, and water systems. Various nozzles include two passageways or tubes (e.g., one inside the other), exit orifices (e.g., from each passageway), or a combination thereof. Tubes may be concentric or a passageway may be between inner and outer tubes. Nozzles may be configured to be hand guided by an operator while excavating the material. Embodiments may include air and water valves, controls, or both.

Abstract: A computer-implemented method comprising: controlling input of data quantifying damage received by a compressor of a gas turbine engine into a first machine learning algorithm; receiving data quantifying a first operating parameter of the compressor as an output of the first machine learning algorithm; and determining operability of the compressor by comparing the received data quantifying the first operating parameter of the compressor with a threshold.

Abstract: A computer-implemented method comprising: receiving an operability determination for a compressor of a gas turbine engine, the operability determination being determined using an output from a machine learning algorithm trained using data quantifying damage received by compressor blades of a compressor; determining one or more actions to be performed using the received operability determination; and generating control data using the determined one or more actions.

Abstract: A computer-implemented method comprising: controlling input of at least a portion of a first training data set into a first machine learning algorithm, the first training data set including: data quantifying damage to a first compressor; and data quantifying a first operating parameter of the first compressor; executing the first machine learning algorithm; receiving data quantifying the first operating parameter as an output of the first machine learning algorithm; and training the first machine learning algorithm using: the received data output from the first machine learning algorithm; and data quantifying the first operating parameter of the first compressor, the trained first machine learning algorithm being configured to enable determination of operability of a second compressor of a gas turbine engine.

Abstract: A multistage compressor for a gas turbine engine is disclosed. The compressor includes a plurality of compressor stages, each stage including in axial flow series a row of rotor blades and a row of stator vanes; a hub to which a radially inner end of each rotor blade of the rows of rotor blades is connected; and a casing that circumscribes the rows of rotor blades and the rows of stator vanes. An aerofoil portion of each of the rotor blades and/or the stator vanes of one or more of the plurality of compressor stages is profiled in a spanwise direction such that the aerofoil portion has a trailing edge that is angled more towards an axial direction of the multistage compressor in regions of the aerofoil portion proximal to the casing and the hub than in a mid-region of the aerofoil portion.

Abstract: Apparatuses that include a nozzle, vacuum units, and vacuum trucks for excavating material, for instance, around buried utility lines. Multiple embodiments include an (e.g., air and water) nozzle, for instance, that breaks up material (e.g., earth) that is picked up with vacuum. Various embodiments include vacuum, compressed air, and water systems. Various nozzles include two passageways or tubes (e.g., one inside the other), exit orifices (e.g., from each passageway), or a combination thereof. Tubes may be concentric or a passageway may be between inner and outer tubes. Nozzles may be configured to be hand guided by an operator while excavating the material. Embodiments may include air and water valves, controls, or both.

Abstract: Vacuum units and vacuum trucks, for example, for excavating material, for instance, around buried utility lines. Multiple embodiments include an air and water nozzle that provides air and water to break up material (e.g., earth) that is picked up by a vacuum system. Various embodiments include a vacuum system, a compressed air system, a water system, and an air and water nozzle configured to be hand guided by an operator while excavating the material. In a number of embodiments, the air and water nozzle can include a body that is hand held by the operator while excavating the material, an air passageway through the body, a water passageway through the body, an air valve, a water valve, an air control that opens and closes the air valve, and a water control that opens and closes the water valve.

Abstract: This disclosure concerns aerofoils for an axial flow compressor. The compressor has an array of aerofoils angularly spaced about its axis of rotation. The aerofoils have leading and trailing edges extending in a direction spanning a flow region defined between a radially inner rotor component and a radially outer casing. Each aerofoil has opposing pressure and suction surfaces extending between the leading and trailing edges and terminating at a free end of the aerofoil. Each aerofoil leans towards the pressure surface by an angle of between 10° and 80° in the vicinity of the aerofoil tip. The aggressive negative lean towards the tip may help reduce over-tip leakage flow in use.

Abstract: A multistage compressor for a gas turbine engine, the compressor comprising a plurality of compressor stages, each compressor stage comprising in axial flow series a row of rotor blades and a row of stator vanes. A radially inner end of the rotor blades are connected to a hub. A casing circumscribes the rotor blades and the stator vanes. The rotor blades and the stator vanes each have an aerofoil portion. Each of the aerofoil portions of the rotor blades and/or the stator vanes of one or more stages of the compressor are profiled in a spanwise direction such that the aerofoil portion has a trailing edge that is angled more towards the axial direction in a region proximal to the casing and hub than in a mid-region.

Abstract: Vacuum units and vacuum trucks, for example, for excavating material, for instance, around buried utility lines. Multiple embodiments include an air and water nozzle that provides air and water to break up material (e.g., earth) that is picked up by a vacuum system. Various embodiments include a vacuum system, a compressed air system, a water system, and an air and water nozzle configured to be hand guided by an operator while excavating the material. In a number of embodiments, the air and water nozzle can include a body that is hand held by the operator while excavating the material, an air passageway through the body, a water passageway through the body, an air valve, a water valve, an air control that opens and closes the air valve, and a water control that opens and closes the water valve.

Abstract: A method and device that controls one or more apparatus in relation to the expected time of sunrise and sunset at the location of the apparatus. The operator enters a geographic location identifier, such as a zip code or telephone area code, and the controller computes the expected time of sunrise and sunset at the corresponding geographic location. The controller is configured to translate the entered geographic location code into the offset times, based upon the latitude and longitude of the location. The controller is able to either directly retrieve stored time offsets or it retrieves the latitude and longitude that corresponds to the entered geographic location code and determines the time offset from that latitude and longitude.

Abstract: A method and device that controls one or more apparatus in relation to the expected time of sunrise and sunset at the location of the apparatus. The operator enters a geographic location identifier, such as a zip code or telephone area code, and the controller computes the expected time of sunrise and sunset at the corresponding geographic location. The controller is configured to translate the entered geographic location code into the offset times, based upon the latitude and longitude of the location. The controller is able to either directly retrieve stored time offsets or it retrieves the latitude and longitude that corresponds to the entered geographic location code and determines the time offset from that latitude and longitude.

Abstract: Workers access the system, for example, by telephone, web browser, e-mail, or fax, without the assistance of a human intermediary, such as an operator. The system deploys parsing and sorting routines to ascertain the nature of a communication, determine how to handle the communication, and select a roster of representatives qualified to handle the communication. The system determines whether to connect telephone and web browser callers in real time to a qualified representative. The system permits callers to schedule a conference if no representative comes on line. The system can initiates a conference if callers trust the system to hold their telephone numbers. The system delivers e-mails, faxes, and messages from telephone and web browser callers to a qualified representative through an electronic mail system that also transmits replies to message boxes that callers can access anonymously. The system can be configured to transmit replies to e-mails and faxes.

Abstract: Workers access the system, for example, by telephone, web browser, e-mail, or fax, without the assistance of a human intermediary, such as an operator. The system deploys parsing and sorting routines to ascertain the nature of a communication, determine how to handle the communication, and select a roster of representatives qualified to handle the communication. The system determines whether to connect telephone and web browser callers in real time to a qualified representative. The system permits callers to schedule a conference if no representative comes on line. The system can initiates a conference if callers trust the system to hold their telephone numbers. The system delivers e-mails, faxes, and messages from telephone and web browser callers to a qualified representative through an electronic mail system that also transmits replies to message boxes that callers can access anonymously. The system can be configured to transmit replies to e-mails and faxes.