Abstract: A method of operating a system including a hydrogen internal combustion engine and a supercharger between a normal operating mode and an engine braking mode. In the normal operating mode, the supercharger operates at a first rotational speed to deliver air to an intake manifold of the engine. In the engine braking mode, the supercharger operates at a second rotational speed to deliver air to the intake manifold and a restriction is provided to increase a pressure ratio across the supercharger.

Abstract: A method of conducting and reporting a survey includes generating a survey template comprising a plurality of asset assessment queries with each of the asset assessment queries corresponding to a request for data regarding an assessment of a status and/or condition of an associated one of the plurality of assets disposed at a survey site. A conducting of the survey by a surveyor includes the surveyor accessing the survey template during execution of a software application on a first user device and the surveyor submitting survey related data to a computing system regarding the status and/or condition of each of the associated assets as an entry to each of the corresponding asset assessment queries. The results of the survey are digitally reported to a customer organization following completion of the conducting of the survey.

Abstract: A method of executing a work order includes generating a work order and assigning the work order to a technician, the technician utilizing a user device executing a software application managed by a computing system. A check-in process is conducted wherein the computing system determines whether the technician has satisfied each of one or more check-in conditions. The technician assesses and diagnoses any potential issues or concerns with respect to each of the assets associated with the work order. A check-out process is conducted following completion of the task specified by the work order and/or the technician requesting a second technician engagement at the work site, and includes the computing system determining whether the technician has satisfied each of one or more check-out conditions.

Abstract: An exhaust gas recirculation pump system for an internal combustion engine includes an EGR gas source and an electric motor assembly. A roots device is coupled to the electric motor. The roots device includes a housing defining an internal volume wherein the housing includes a radial inlet port receiving the EGR gas source and an outlet port expelling the EGR gas from the housing. Rotors are disposed in the internal volume and connected to the electric motor. A transmission housing is attached to the housing. The transmission housing includes journals formed therein receiving bearings that support the rotors on only a single end of the rotors.

Abstract: An exhaust gas recirculation pump system for an internal combustion engine includes an EGR gas source and an electric motor assembly. A roots device is coupled to the electric motor. The roots device includes a housing defining an internal volume wherein the housing includes a radial inlet port receiving the EGR gas source and an outlet port expelling the EGR gas from the housing. Rotors are disposed in the internal volume and connected to the electric motor. A transmission housing is attached to the housing. The transmission housing includes journals formed therein receiving bearings that support the rotors on only a single end of the rotors.

Abstract: A mandrel suitable for forming a hollow part from a heat curable material includes an (a) an elongate central member having a coefficient of expansion which is different than the coefficient of expansion of the cured heat curable material, (b) at least one lateral member disposed at a first location and projecting away from the outer surface of the central member, the lateral member being slidably attached to the central member, and (c) a rigid elongate strut member having a coefficient of expansion substantially similar to the coefficient of expansion of the cured heat curable material. The first end of the strut member is affixed to the lateral member, and the second end of the strut member is affixed spaced apart from the lateral member.

Abstract: A mandrel suitable for forming a hollow part from a heat curable material includes an (a) an elongate central member having a coefficient of expansion which is different than the coefficient of expansion of the cured heat curable material, (b) at least one lateral member disposed at a first location and projecting away from the outer surface of the central member, the lateral member being slidably attached to the central member, and (c) a rigid elongate strut member having a coefficient of expansion substantially similar to the coefficient of expansion of the cured heat curable material. The first end of the strut member is affixed to the lateral member, and the second end of the strut member is affixed spaced apart from the lateral member.

Abstract: A mandrel suitable for forming a hollow part from a heat curable material includes an (a) an elongate central member having a coefficient of expansion which is different than the coefficient of expansion of the cured heat curable material, (b) at least one lateral member disposed at a first location and projecting away from the outer surface of the central member, the lateral member being slidably attached to the central member, and (c) a rigid elongate strut member having a coefficient of expansion substantially similar to the coefficient of expansion of the cured heat curable material. The first end of the strut member is affixed to the lateral member, and the second end of the strut member is affixed spaced apart from the lateral member.

Abstract: The concrete form is a structure having a user-selectable shape allowing for the creation of an opening in a concrete surface, such as a concrete patio, with the opening having the user-selectable shape. The form includes a plurality of wall members, which are joined together to form a closed continuous wall having the user-selectable shape. The wall members are each secured to the ground, and the user pours liquid concrete on the ground exterior to the closed continuous wall. The closed continuous wall defines the opening and prevents flow of the liquid concrete within the opening. Following hardening of the concrete, the form may be removed, leaving an opening in the concrete surface, having the user-selectable shape, in which the user may plant flora and the like.