Abstract: A roof-mounted exhaust unit including an inlet portion configured to receive exhaust air; an outlet portion through which the exhaust air exits the roof-mounted exhaust unit; a plurality of exhaust fans positioned downstream from the inlet and upstream from the outlet; a plurality of gravity dampers respectively associated with the exhaust fans, the gravity dampers positioned downstream from the exhaust fans and being configured to open when the exhaust air impacts the gravity dampers at a threshold velocity; and at least one acoustic absorbing panel configured to absorb sound produced by the roof-mounted exhaust unit.

Abstract: According to various embodiments, an exhaust system includes: a housing with an air inlet that allows air to enter the housing and an air outlet that allows air to exit the housing; a vertical array of multiple fans that includes at least one upper fan and at least one lower fan, wherein the at least one upper fan is disposed above the at least one lower fan and is positioned with a horizontal offset in a horizontal direction from the at least one lower fan so that the at least one upper fan is closer to the air inlet in the horizontal direction than the at least one lower fan; and a deflector plate disposed within an inlet air plenum for the vertical array of multiple fans, wherein the deflector plate facilitates a flow of air entering the housing via the air inlet toward the at least one upper fan.

Abstract: A method of manufacturing a preformed elbow insulation fitting includes applying an adhesive to an edge surface of each of a plurality of insulation gore components. After applying the adhesive, the plurality of insulation gore components are formed around a mold. When forming the plurality of gores around the mold, adjacent gores of the plurality of gores are adhered together to form a preformed insulation elbow around the mold. The preformed insulation embow can include a split line space between gore components running radially along a perimeter of the preformed insulation elbow. The preformed insulation elbow is then removed from the mold.

Abstract: A method and system for determining hydrologic conditions with respect to a surface point including generating one-dimensional columns representing hydrologic properties associated with the surface point to assist in determining the hydrologic conditions. The hydrologic conditions may be associated with historical conditions or a simulation of future conditions of the surface point.

Abstract: A method of manufacturing a preformed elbow insulation fitting includes applying an adhesive to an edge surface of each of a plurality of insulation gore components. After applying the adhesive, the plurality of insulation gore components are formed around a mold. When forming the plurality of gores around the mold, adjacent gores of the plurality of gores are adhered together to form a preformed insulation elbow around the mold. The preformed insulation embow can include a split line space between gore components running radially along a perimeter of the preformed insulation elbow. The preformed insulation elbow is then removed from the mold.

Abstract: A switched mode assisted linear (SMAL) amplifier/regulator architecture can be configured to supply regulated power to a dynamic load, such as an RF power amplifier. Embodiments of a SMAL regulator can include a linear amplifier and a switched mode converter parallel coupled at a supply node, and configured such that the amplifier sets load voltage, while the amplifier and the switched converter are cooperatively controlled to supply load current. The amplifier can include separate feedback loops: an external relatively lower speed feedback loop for controlling signal path bandwidth, and an internal relatively higher speed feedback loop for controlling output impedance bandwidth of the linear amplifier. The linear amplifier can be AC coupled to the supply node, and the switched converter can be configured with a capacitive charge control loop that controls the switched converter to effectively control the amplifier to provide capacitive charge control.

Abstract: The disclosed switched mode assisted linear (SMAL) amplifier/regulator architecture may be configured as a SMAL regulator to supply power to a dynamic load, such as an RF power amplifier. Embodiments of a SMAL regulator include configurations in which a linear amplifier and a switched mode converter (switcher) parallel coupled at a supply node, and configured such that the amplifier sets load voltage, while the amplifier and the switched mode converter are cooperatively controlled to supply load current. In one embodiment, the linear amplifier is AC coupled to the supply node, and the switched converter is configured with a capacitive charge control loop that controls the switched converter to effectively control the amplifier to provide capacitive charge control.

Abstract: The disclosed switched mode assisted linear (SMAL) amplifier/regulator architecture may be configured as a SMAL regulator to supply power to a dynamic load, such as an RF power amplifier. Embodiments of a SMAL regulator include configurations in which a linear amplifier and a switched mode converter (switcher) parallel coupled at a supply node, and configured such that the amplifier sets load voltage, while the amplifier and the switched mode converter are cooperatively controlled to supply load current. In one embodiment, the amplifier includes separate feedback loops: an external relatively lower speed feedback loop may be configured for controlling signal path bandwidth, and an internal relatively higher speed feedback loop may be configured for controlling output impedance bandwidth of the linear amplifier.

Abstract: The disclosed switched mode assisted linear (SMAL) amplifier/regulator architecture may be configured as a SMAL regulator to supply power to a dynamic load, such as an RF power amplifier. Embodiments of a SMAL regulator include configurations in which a linear amplifier and a switched mode converter (switcher) parallel coupled at a supply node, and configured such that the amplifier sets load voltage, while the amplifier and the switched mode converter are cooperatively controlled to supply load current. In one embodiment, the linear amplifier is AC coupled to the supply node, and the switched converter is configured with a capacitive charge control loop that controls the switched converter to effectively control the amplifier to provide capacitive charge control.

Abstract: A method for trending the functionality of the circuits of a switch, router or other piece of equipment. The method accesses error logs for the equipment. These error logs are normally maintained in a data base associated with the piece of equipment. Next, a historical report is generated. This historical report comprises historical information regarding the operability of at least one circuit. Finally, the historical information in the report is used to predict the future operability of the circuit, or circuits.