Abstract: A trough collector for solar energy, with multiple parallel troughs preferably being contained within a single unit. The collector does not use conventional azimuth tracking in order to keep the sun's rays directed toward the parabola's focus as the sun moves across the sky. Instead, the relative position between the collecting device (preferably a conductive tube containing a circulating working fluid) and the plane of symmetry for each collector is adjusted so that the collecting device remains within the focal zone of the collector as the sun traverses the sky.

Abstract: A trough collector for solar energy, with multiple parallel troughs preferably being contained within a single unit. The collector does not use conventional azimuth tracking in order to keep the sun's rays directed toward the parabola's focus as the sun moves across the sky. Instead, the relative position between the collecting device (preferably a conductive tube containing a circulating working fluid) and the plane of symmetry for each collector is adjusted so that the collecting device remains within the focal zone of the collector as the sun traverses the sky.

Abstract: A jet engine noise suppression system uses a plurality of microjets that are located on a frame downstream of the exhaust port of a jet engine. Each microjet issues a microjet flow, either liquid or gas, directed at the main jet flow issued by the engine. The mass of the combined microjet flow is substantially smaller than the mass of the jet engine flow. The angle of at which each microjet issues its flow may be variable. The microjets may be located on a pop-up head of a blast deflector or on a upstanding rack.

Abstract: A new reactant delivery system for delivering reactants to the membrane electrode assembly of a fuel cell. The invention uses a plurality of small holes to propel high-velocity streams of reactant gases (“microjets”) against an impingement plate. The microjets assist in catalyzing the reactant gases and forcing them toward the proton exchange membrane. Reactant gas flow is primarily perpendicular to the orientation of the proton exchange membrane, thereby enhancing diffusion rates. In addition, each microjet acts like an expansion valve, which significantly cools the flowing gas and provides internal heat absorption. This internal heat absorption permits higher energy densities in the fuel cell.

Abstract: A new reactant delivery system for delivering reactants to the membrane electrode assembly of a fuel cell. The invention uses a plurality of small holes to propel high-velocity streams of reactant gases (“microjets”) against an impingement plate. The microjets assist in catalyzing the reactant gases and forcing them toward the proton exchange membrane. Reactant gas flow is primarily perpendicular to the orientation of the proton exchange membrane, thereby enhancing diffusion rates. In addition, each microjet acts like an expansion valve, which significantly cools the flowing gas and provides internal heat absorption. This internal heat absorption permits higher energy densities in the fuel cell.

Abstract: A dynamic cavity air flow system reduces the highly unsteady flow over exposed aircraft cavities by incorporating a series of microjets proximate the leading edge of a cavity. The microjets, which may articulate, issue a supersonic jet flow toward the rear or trailing edge of the cavity whenever the cavity is exposed during flight. The microjets receive the air for the flow from either a dedicated pressurized gas source aboard the aircraft or from bleed air taken from an engine of the aircraft. Appropriate sensors and controllers are provided for control of the system.

Abstract: A microjet based control system helps control the feedback loop that is created by an impinging jet of a STOVL aircraft. A plurality of microjets circumferentially encompass the outer periphery of the impinging jet and each issues a jet flow toward the jet flow created by the impinging jet. A control system is connected to the microjets for adaptively controlling the microjets based on various operating parameters collected by various input devices.