Abstract: An electrostatic transducer, a diaphragm (2) therefor, and corresponding methods of manufacture are disclosed. The electrostatic transducer is preferably for use in a motor vehicle. A composite laminated diaphragm (2) is manufactured by providing a first insulating layer (4), providing a conductive layer (6) on a surface of the first insulating layer (4), and bonding a second insulating layer (10) to the conductive layer (6) such that the second insulating layer (10) extends over the conductive layer (6). The first and second insulating layers (4, 10) each comprise a sheet of uncharged insulating material. The thickness of the composite laminated diaphragm (2) is less than 20 ?m.

Abstract: An electrostatic transducer includes first and second flexible conductive membranes; and first and second conductive stators. The membranes and the stators are assembled in a layered configuration with the membranes the stators. The electrostatic transducer is arranged in use to apply an electrical potential which gives rise to an electrostatic force between the membranes and the stators that causes the membranes to move relative to the stators. The first and second flexible conductive membranes have respective first and second effective compliances, wherein the first effective compliance is at least 10% greater than the second effective compliance.

Abstract: An electrostatic transducer includes first and second flexible conductive membranes; and first and second conductive stators. The membranes and the stators are assembled in a layered configuration with the membranes between the stators and with an enclosed volume of air sealed between the first and second membranes. The electrostatic transducer is arranged in use to apply an electrical potential which gives rise to an electrostatic force between the membranes and the stators that causes the membranes to move relative to the stators.

Abstract: This disclosure describes an on-board oxygen generating system (OBOGS) using open loop control. An example OBOGS includes a concentrator comprising at least two beds and a controller. Each bed has a valve to pneumatically couple the bed between a supply gas source and a vent; The controller receives at least one input signal from at least one sensor aboard an aircraft, and determines a predicted oxygen concentration output from the at least two beds into the based on the received input signals. The controller controls the valves of the at least two beds based on the determined predicted oxygen concentration to adjust charge/vent ratios of the at least two beds.

Abstract: An electrostatic transducer, a diaphragm (2) therefor, and corresponding methods of manufacture are disclosed. The electrostatic FIG. 1 transducer is preferably for use in a motor vehicle. A composite laminated diaphragm (2) is manufactured by providing a first insulating layer (4), providing a conductive layer (6) on a surface of the first insulating layer (4), and bonding a second insulating layer (10) to the conductive layer (6) such that the second insulating layer (10) extends over the conductive layer (6). The first and second insulating layers (4, 10) each comprise a sheet of uncharged insulating material. The thickness of the composite laminated diaphragm (2) is less than 20 ?m.

Abstract: This disclosure describes an on-board oxygen generating system (OBOGS) using open loop control. An example OBOGS includes a concentrator comprising at least two beds and a controller. Each bed has a valve to pneumatically couple the bed between a supply gas source and a vent; The controller receives at least one input signal from at least one sensor aboard an aircraft, and determines a predicted oxygen concentration output from the at least two beds into the based on the received input signals. The controller controls the valves of the at least two beds based on the determined predicted oxygen concentration to adjust charge/vent ratios of the at least two beds.

Abstract: In some examples, a ventilator includes a pneumatic connection configured to receive supply gas; an inspiratory path configured to deliver conditioned gas to lungs of a patient; a valve pneumatically connected to the pneumatic connection and configured to allow flow of the supply gas to the inspiratory path when the valve is open and block flow of the supply gas to the inspiratory path when the valve is closed; a pressure sensor configured to measure a pressure of the supply gas at the pneumatic connection; and electronic control circuitry configured to control an opening and closing of the valve based on the measured pressure to produce a desired volume of conditioned gas in the inspiratory path.

Abstract: A liquid dispensing apparatus for applying liquid products to row crops. The liquid dispensing apparatus includes a plurality of drop assemblies supported by and laterally spaced along a boom structure and pivotal with respect thereto. Each of the drop assemblies includes dribble hoses for dribbling a liquid product onto the soil in a rhizosphere of adjacent crop rows. The drop assemblies may include a spray assembly for spraying the row crops.

Abstract: Techniques are described for processing an audio signal to reduce the total harmonic distortion caused when it is reproduced by a loudspeaker, which is located within an audio reproduction device having an enclosure with an associated resonant frequency. After receiving the input audio signal, which includes the resonant frequency of the enclosure, the level of the input audio signal at the resonant frequency is reduced, thereby producing a first processed signal. In addition, the level of said input audio signal is reduced at all frequencies, producing a second processed signal. The first and second processed signals are combined to produce an output audio signal. The degree to which the level of the audio signal at both the resonant frequency and at all frequencies is reduced may be dependent upon the current volume level.

Abstract: Techniques are described for processing an audio signal to reduce the total harmonic distortion caused when it is reproduced by a loudspeaker, which is located within an audio reproduction device having an enclosure with an associated resonant frequency. After receiving the input audio signal, which includes the resonant frequency of the enclosure, the level of the input audio signal at the resonant frequency is reduced, thereby producing a first processed signal. In addition, the level of said input audio signal is reduced at all frequencies, producing a second processed signal. The first and second processed signals are combined to produce an output audio signal. The degree to which the level of the audio signal at both the resonant frequency and at all frequencies is reduced may be dependent upon the current volume level.

Abstract: The invention as presently conceived discloses a unique system and method for an improved infant car seat having an integral extra transportation apparatus combining the functionality of a car seat with a stroller into one device. The apparatus generally resembles a conventional infant car seat but with an overhead handle that can be extracted from behind the headrest with a set of two folding legs extending downward and locking in place. Each extended leg has a pair of wheels that when used in conjunction with the handle allows the entire apparatus to serve as an infant stroller in a manner similar to a wheelbarrow. A third brace leg has a stabilizing rubber foot that extends down from behind the seat to allow the apparatus to safely stand unassisted. This novel apparatus and system will permit a care giver to remove the apparatus from a vehicle with the infant remaining in the seat, and by extending the legs into place, transform the apparatus into a stroller.

Abstract: An apparatus for storing items includes a housing sized to be portable and including a storage compartment for receiving the items, and a mechanism for refrigerating and humidifying the storage compartment joined to the housing. The housing is preferably a cabinet having a having a storage compartment access door and a compartment for retaining at least part of the mechanism for refrigerating and humidifying the storage compartment. A duct is preferably provided for delivering the air streams into the storage compartment. The mechanism for refrigerating and humidifying including a vessel containing water, a wick structure extending above and into the water, a first fan for creating an air stream toward the wick structure, a first electric circuit for delivering electric power to the first fan, a second fan for creating an air stream over the surface of the water, a second electric circuit for delivering electric power to the second fan, and a mechanism for cooling the water.