Abstract: A system is provided for speed control during motoring of a gas turbine engine of an aircraft. The system includes an air turbine starter, a starter air valve operable to deliver compressed air to the air turbine starter, and a controller. The controller is operable to adjust the starter air valve to control motoring of the gas turbine engine based on measured feedback with lead compensation to reject disturbances attributable to dual to single or single to dual engine starting transitions.

Abstract: Augmented reality methods and systems are described. According to one aspect, an augmented reality computer system includes processing circuitry configured to access an image of the real world, wherein the image includes a real world object, and evaluate the image using a neural network to determine a plurality of augmented reality estimands which are indicative of a pose of the real world object and which are useable to generate augmented content regarding the real world object. Other methods and systems are disclosed including additional aspects directed towards training and using neural networks.

Abstract: Systems and methods for use with a variable pressure actuator control system for a gas turbine engine are provided. A variable pressure actuator control system for a gas turbine engine may comprise a controller, a pressure regulating electro-hydraulic servo valve assembly (P-EHSV), including a variable restriction flow path, in electronic communication with the controller, a position regulating electro-hydraulic servo valve assembly (X-EHSV), including a network of flow paths, in electronic communication with the controller, a bypass regulator (BPR) in fluid communication with at least one of a pump, the P-EHSV, or the X-EHSV, the BPR configured to be controlled by the P-EHSV via a bypass pressure to vary an available pressure, and an actuator comprising an actuator piston. The variable pressure actuator control system may minimize pressure when possible to increase mission capability for a gas turbine engine.

Abstract: A liquid injection apparatus for use with a compressor having a rotor shaft and a casing part is provided. The liquid injection apparatus includes at least one conduit and at least one nozzle coupled to the conduit(s). The liquid injection apparatus is panel-shaped and has a first panel segment, a second panel segment, and at least one of: a passage defined between the first panel segment and the second panel segment, the passage sized to receive at least one of the rotor shaft and the casing part; and a third panel segment positioned between the first panel segment and the second panel segment. The third panel segment is at least in part detachable from the first panel segment and/or the second panel segment for receiving at least one of the rotor shaft and the casing part between the first panel segment and the second panel segment.

Abstract: An oven range appliance including a chamber liner defining a cooking chamber, as well as a cabinet enclosing the chamber liner in cooking chamber, is provided. The cabinet includes a side panel positioned at a first side of the cabinet defining a cooling channel between the chamber liner and the side panel of the cabinet. A diverter panel is provided extending from the side panel towards the chamber liner. The diverter panel blocks a flow of cooling air from the cooling channel at a location proximate a back side of the cabinet to increase a flow of cooling air from the cooling channel at a location proximate the front side of the cabinet.

Abstract: A power tool includes a housing, a motor, and a drive mechanism. The drive mechanism includes a driven gear that is rotated by the motor. The driven gear is vertically-oriented within the housing and has an upper portion and a lower portion. The drive mechanism also includes a connecting rod coupled to the driven gear to translate rotary motion of the driven gear into reciprocating motion, and an output shaft coupled to the connecting rod to reciprocate relative to the housing through a cutting stroke and a return stroke. The drive mechanism further includes a counterweight coupled to the driven gear for rotation with the driven gear. The counterweight moves through the upper portion of the driven gear during the cutting stroke of the output shaft, and moves through the lower portion of the driven gear during a return stroke of the output shaft.

Abstract: Document changes are sent within a body of an electronic message to reviewers that are collaborating on the document. The document may be any type of document to which changes/comments are made, such as word processing documents, spreadsheets, slides, and the like. A reviewer receiving the electronic message may accept/reject changes and/or make comments/modifications to the document changes that are contained within the electronic message. For example, a reviewer may edit the document changes that are included within the body of the electronic message to add a comment and/or make changes to the change. A reviewer may also have the option to accept/reject changes directly from within the electronic message. After making any changes, the reviewer replies to the electronic message and the changes that are included within the electronic message are applied to the document.

Abstract: An adjustable light fixture including a base and a mounting member configured to movably connect a light source to the base. The mounting member is configured to rotate about a rotational axis that moves relative to the base. The adjustably light fixture can be implemented as an overhead light fixture by connecting the base to a ceiling. Also provided is a method adjusting an overhead light fixture including rotating a mounting member and translating the mounting member relative to a base.

Abstract: A control system for a gas turbine engine, a method for controlling a gas turbine engine, and a gas turbine engine are disclosed. The control system may include a hybrid model predictive control (HMPC) module, the HMPC module receiving power goals and operability limits and determining a multi-variable control command for the gas turbine engine, the multi-variable control command determined using the power goals, the operability limits, actuator goals, sensor signals, and synthesis signals. The control system may further include system sensors for determining the sensor signals and a non-linear engine model for estimating corrected speed signals and synthesis signals using the sensor signals, the synthesis signals including an estimated stall margin remaining. The control system may further include a goal generation module for determining actuator goals for the HMPC module using the corrected speed signals and an actuator for controlling the gas turbine engine based on the multivariable control command.

Abstract: Systems and methods for use with a variable pressure actuator control system for a gas turbine engine are provided. A variable pressure actuator control system for a gas turbine engine may comprise a controller, a pressure regulating electro-hydraulic servo valve assembly (P-EHSV), including a variable restriction flow path, in electronic communication with the controller, a position regulating electro-hydraulic servo valve assembly (X-EHSV), including a network of flow paths, in electronic communication with the controller, a bypass regulator (BPR) in fluid communication with at least one of a pump, the P-EHSV, or the X-EHSV, the BPR configured to be controlled by the P-EHSV via a bypass pressure to vary an available pressure, and an actuator comprising an actuator piston. The variable pressure actuator control system may minimize pressure when possible to increase mission capability for a gas turbine engine.

Abstract: An oven range appliance including a chamber liner defining a cooking chamber, as well as a cabinet enclosing the chamber liner in cooking chamber, is provided. The cabinet includes a side panel positioned at a first side of the cabinet defining a cooling channel between the chamber liner and the side panel of the cabinet. A diverter panel is provided extending from the side panel towards the chamber liner. The diverter panel blocks a flow of cooling air from the cooling channel at a location proximate a back side of the cabinet to increase a flow of cooling air from the cooling channel at a location proximate the front side of the cabinet.

Abstract: A track installation system for a machine is provided. The track installation system includes an operator interface. The operator interface is configured to provide a signal indicative of an installation of a first track over a first sprocket, and a signal indicative of at least one of a direction and a speed of rotation of the first sprocket. The track installation system also includes a controller configured to receive the signal indicative of the installation of the first track over the first sprocket. The controller is also configured to receive the signal indicative of at least one of the direction and the speed of rotation of the first sprocket. The controller is further configured to control at least a parameter of the machine to hold at least one of the machine, the first sprocket, and the second sprocket in a stationary state.

Abstract: A double oven range appliance and a gas burner and floor assembly for an oven appliance are provided. The gas burner and floor assembly includes a cooking chamber bottom panel with a projection defining a plurality of openings. A gas burner is positioned above the plurality of openings. A floor panel is positioned below the cooking chamber bottom panel. An insulation panel is mounted to the floor panel such that the insulation panel is disposed below the plurality of openings. The gas burner and floor assembly can assist with limiting heat transfer along a vertical direction while also providing a suitable flow of air at the gas burner.

Abstract: A user may select an attachment for an electronic message from a most recently used (MRU) list of files. For example, when a user is composing an electronic message, they may select a file to attach to the message from the MRU list. The recently used files that are included within the MRU list may be related to or more applications/locations and/or one or more computing devices. For example, the MRU list may include files accessed by one or more different authoring applications and/or files that have recently been accessed/created that are associated with the user.

Abstract: Apparatus and methods for endodontic treatment of teeth provide effective cleaning of organic material (such as pulp and diseased tissue) from the root canal system. In an embodiment, a compressor system generates high pressure liquid (e.g., water) that flows through an orifice to produce a high-velocity collimated jet of liquid. The high-velocity jet is directed toward a surface of a tooth, for example, an exposed dentinal surface, and impingement of the jet onto the surface generates an acoustic wave that propagates throughout the tooth. The acoustic wave effectively detaches organic material from dentinal surfaces and tubules. The detached organic material is flushed from the root canal system by the liquid jet and/or by additional irrigation.

Abstract: A load power sharing control system for a twin-engine rotorcraft having a first gas turbine engine and a second gas turbine engine is provided.

Abstract: Apparatus and methods for endodontic treatment of teeth provide effective cleaning of organic material (such as pulp and diseased tissue) from the root canal system. In an embodiment, a compressor system generates high pressure liquid (e.g., water) that flows through an orifice to produce a high-velocity collimated jet of liquid. The high-velocity jet is directed toward a surface of a tooth, for example, an exposed dentinal surface, and impingement of the jet onto the surface generates an acoustic wave that propagates throughout the tooth. The acoustic wave effectively detaches organic material from dentinal surfaces and tubules. The detached organic material is flushed from the root canal system by the liquid jet and/or by additional irrigation.

Abstract: A user may select an attachment for an electronic message from a most recently used (MRU) list of files. For example, when a user is composing an electronic message, they may select a file to attach to the message from the MRU list. The recently used files that are included within the MRU list may be related to or more applications/locations and/or one or more computing devices. For example, the MRU list may include files accessed by one or more different authoring applications and/or files that have recently been accessed/created that are associated with the user.

Abstract: A control system for a gas turbine engine, a method for controlling a gas turbine engine, and a gas turbine engine are disclosed. The control system may include a hybrid model predictive control (HMPC) module, the HMPC module receiving power goals and operability limits and determining a multi-variable control command for the gas turbine engine, the multi-variable control command determined using the power goals, the operability limits, actuator goals, sensor signals, and synthesis signals. The control system may further include system sensors for determining the sensor signals and a non-linear engine model for estimating corrected speed signals and synthesis signals using the sensor signals, the synthesis signals including an estimated stall margin remaining. The control system may further include a goal generation module for determining actuator goals for the HMPC module using the corrected speed signals and an actuator for controlling the gas turbine engine based on the multivariable control command.