Abstract: Methods and apparatus to control engine speed of a power system are disclosed. An example power system includes: an engine; an air compressor configured to generate and store air pressure in an air storage tank based on mechanical power provided by the engine; and control circuitry configured to: monitor the air pressure in the air storage tank; determine a rate of air pressure change based on the monitoring of the air pressure; in response to the rate of air pressure change satisfying a threshold rate, incrementally increasing a speed of the engine; detecting a load on an AC auxiliary output; and in response to detecting the load on the AC auxiliary output, overriding an engine speed based on the air compressor, and controlling the speed of the engine to be the predetermined speed to output the predetermined frequency.

Abstract: A pellet including C-grade iron fines and a binder; a method of producing said pellet, including mixing the C-grade iron fines and the binder to form a mixture and agglomerating the mixture to form a pellet; and a method of producing steel, including heating a pellet including C-grade iron fines and a binder in an electric arc furnace are all provided.

Abstract: Methods and apparatus to control engine speed of a power system are disclosed. An example power system includes: an engine; a generator configured to generate electrical power from mechanical power delivered by the engine; a switched-mode power supply configured to convert the electrical power from the generator to output power; and control circuitry configured to: monitor an input current to the switched-mode power supply; and in response to the input current exceeding a threshold current, incrementally increasing a speed of the engine.

Abstract: The invention relates to the use of fibres, often in briquettes, and to the production of briquettes, for instance from coal, metal or metal ores. Typically the briquettes are formed from particulate material and a fibre.

Abstract: An example welding power supply includes: power conversion circuitry configured to convert supply power to welding current and to output the welding current to at least one of a shielded metal arc welding (SMAW) electrode or a gouging torch; a voltage sense circuit configured to measure an output voltage of the power conversion circuitry; and control circuitry configured to: control the power conversion circuitry using a current-controlled control loop based on a target current; while the output voltage is above a lower voltage limit, control the target current based on a difference between a reference voltage and the output voltage; and in response to detecting that the output voltage has decreased below the lower voltage limit, control a welding current output by the power conversion circuitry based on a first exponential relationship.

Abstract: A binder formulation for iron ore pellets, the formulation comprising one or more silicates and a processing aid, a pellet comprising this binder formulation and a process for producing iron ore pellets comprising mixing a binder formulation as described with particulate iron ore and forming pellets.

Abstract: Methods and apparatus to control an output of a switched-mode power supply in a service pack are disclosed. An example power system includes: an engine; a generator configured to generate electrical power from mechanical power delivered by the engine; a switched-mode power supply, comprising an inverter, configured to convert the electrical power from the generator to output power, the output power comprising at least one of welding-type power or battery charging power; a user input device configured to receive an input selecting at least one of a first mode representative of a first welding-type process or a second mode representative of a first battery charging mode; and control circuitry configured to: when the first mode is selected, control the switched-mode power supply to output welding-type power; and when the second mode is selected, control the switched-mode power supply to output battery charging power.

Abstract: Methods and apparatus to control an output of a switched-mode power supply in a service pack are disclosed. An example power system includes: an engine; a generator configured to generate electrical power from mechanical power delivered by the engine; a switched-mode power supply, comprising an inverter, configured to convert the electrical power from the generator to output power, the output power comprising at least one of welding-type power or battery charging power; a user input device configured to receive an input selecting at least one of a first mode representative of a first welding-type process or a second mode representative of a first battery charging mode; and control circuitry configured to: when the first mode is selected, control the switched-mode power supply to output welding-type power; and when the second mode is selected, control the switched-mode power supply to output battery charging power.

Abstract: Methods and apparatus to control engine speed of a power system are disclosed. An example power system includes: an engine; a generator configured to generate electrical power from mechanical power delivered by the engine; a switched-mode power supply configured to convert the electrical power from the generator to output power; and control circuitry configured to: monitor an input current to the switched-mode power supply; and in response to the input current exceeding a threshold current, incrementally increasing a speed of the engine.

Abstract: Welding power supplies having dynamic current responses are disclosed. Example welding power supplies include: power conversion circuitry configured to convert supply power to welding current; a voltage sense circuit configured to measure an output voltage of the power conversion circuitry; and control circuitry configured to: in response to detecting that the output voltage has decreased below a lower voltage limit: control an increasing ramp rate of the welding current output by the power conversion circuitry; and in response to detecting that the output voltage has increased above the lower voltage limit, control a decreasing ramp rate of the welding current output by the power conversion circuitry.

Abstract: One embodiment of a tagged resin comprises: a thermoplastic material and a marked particle. The marked particle comprises a covert identifier, and the particle has an aspect ratio of about 1:1 to about 10:1. One embodiment of the method for making a tagged item comprises: processing a thermoplastic material and a marked particle comprising a covert identifier, to form a processed item. The processing is selected from the group consisting of extruding, injection-molding, masterbatching, masterblending, thermoforming, blow-molding, and combinations comprising at least one of the foregoing processing. The marked particles in the processed item comprise an aspect ratio of about 1:1 to about 10:1.

Abstract: A method for tuning an electro-mechanical device such as a MEMS device is disclosed. The method comprises operating a MEMS device in a depressurized system and using FIB micromachining to remove a portion of the MEMS device. Additionally, a method for tuning a plurality of MEMS devices by depositing an active layer and then removing a portion of the active layer using FIB micromachining. Also, a method for tuning a MEMS device and vacuum packaging the MEMS device in situ are provided.

Abstract: The present invention discloses methods of manufacturing mechanical resonator microgyroscopes using focused ion beam machining and the mechanical resonator gyroscopes produced therefrom. An exemplary method of tuning a mechanical resonator gyroscope, includes the steps of mounting a mechanical resonator gyroscope in a vacuum chamber with a controllable focused ion beam where the gyroscope includes exciting and sensing elements for measuring a resonant frequency of the gyroscope. The exciting and sensing elements are activated to measure the resonant frequency of the mechanical resonator gyroscope and the resonant frequency of the gyroscope is adjusted to a desired resonant frequency value by controlling the focused ion beam to remove material of the gyroscope.

Abstract: The present invention discloses methods of manufacturing mechanical resonator microgyroscopes using focused ion beam machining and the mechanical resonator gyroscopes produced therefrom. An exemplary method of tuning a mechanical resonator gyroscope, includes the steps of mounting a mechanical resonator gyroscope in a vacuum chamber with a controllable focused ion beam where the gyroscope includes exciting and sensing elements for measuring a resonant frequency of the gyroscope. The exciting and sensing elements are activated to measure the resonant frequency of the mechanical resonator gyroscope and the resonant frequency of the gyroscope is adjusted to a desired resonant frequency value by controlling the focused ion beam to remove material of the gyroscope.