8results about "Electrothermic-effect transistor" patented technology

An underwater sound generation device may be used for effective control of algae and other microorganisms in ponds and lakes. The sound projector may comprise a thermoacoustic sound transducer and an electronic unit for controlling the operation of the projector. The thermoacoustic projector may include a freestanding carbon nanotube (CNT) film encapsulated between two vibrating plates. The inert gas filled thin acoustical cavity provides a piston-type displacement of the plates and supports a high-temperature operation. A power supply driver, controlling the operation of the sound radiating system, may include a pulse generator, high-power switch amplifier, and a cable, connecting the projector with an electronic driver. The sound control system may provide an omnidirectional sound pressure level in a wide frequency range to affect the algae growth ecosystem over large distances.

A transducer comprising a primary element comprising a magnet configured to provide a magnetic field within a magnetic zone, the magnetic field extending in a magnetic field direction; a secondary element comprising a first graphene sheet located within the magnetic zone; a static portion; and a rotating portion configured to rotate about an axis of rotation relative to the static portion. The rotating portion comprises a first one of a set comprising the primary element and the secondary element; and wherein the static portion comprises a second one of the set; and wherein an axis of rotation of the rotating portion is such that: in a first position of the static portion relative to the rotating portion, the first graphene sheet lies in a first plane that is parallel to the magnetic field direction; and in a second position of the static portion relative to the rotating portion, the first graphene sheet lies in an offset plane that is at an angle to the first plane about the axis of rotation. On deployment of the transducer in a first mode, movement of the rotating portion relative to the static portion causes an electrical potential to be generated in the first graphene sheet thereby converting rotational kinetic energy into electrical potential; and / or on deployment of the transducer in a second mode, electrical potential in the first graphene sheet causes rotation of the rotating portion relative to the static portion thereby converting electrical potential into rotational kinetic energy.

An underwater sound generation device may be used for effective control of algae and other microorganisms. The sound projector may comprise a thermoacoustic sound transducer and an electronic unit for controlling the operation of the projector. In at least one embodiment, the thermoacoustic projector includes a freestanding carbon nanotube (CNT) film encapsulated between two vibrating plates. The gas filled thin acoustical cavity provides a piston-type displacement of the plates and supports a high-temperature operation. A power supply driver, controlling the operation of the sound radiating system, may include a pulse generator, high-power switch amplifier, and a cable, connecting the projector with an electronic driver. The sound control system may provide an omnidirectional sound pressure level in a wide frequency range to affect the algae growth ecosystem over large distances.

A pressure wave generating element that includes a support and a fiber layer on the support and constructed to generate heat by energization. The fiber layer is in the form of a fiber membrane having an average pore diameter in a range of 0.1 to 1.0 μm, and the fiber layer includes one or more fibers having a surface at least partly provided with a metal coating.

An apparatus, method and computer program is described including: a driver for driving a membrane of a gas-retaining chamber to induce vibrations in the membrane in a first mode of operation, wherein said membrane is configured to surround at least part of a device; and an activator for activating a rapid expander in a second mode of operation, wherein the expander comprises an expandable foam that is configured to inflate said chamber in response to an activation signal.

An apparatus, method and computer program is described comprising: means for driving a membrane of a gas-retaining chamber (32a) to induce vibrations in the membrane in a first mode of operation, wherein said membrane is configured to surround at least part of a device (30a, 30b); and means for activating a rapid expansion mechanism in a second mode of operation, wherein the expansion mechanism comprises an expandable foam that is configured to inflate said chamber (32b) in response to an activation signal.

A pressure wave generating element that includes a support; a fiber layer on the support, the fiber layer containing a fiber having a surface thereof at least partially coated with a metal coating, and the fiber in the fiber layer being oriented in a predetermined direction; and a pair of electrodes arranged so as to apply a voltage in an orientation direction of the fiber of the fiber layer.

A thermoacoustic heat distribution system (100) is provided. The system includes a base (102) comprising a first surface (104) and a second opposite surface (106), a mounting structure (114C, 114D) for holding the base (102) to a supporting surface (116), a heating medium (108) applied on the base (102), an electrically conductive structure (110) arranged with the base (102), a power supply unit (112) and a magnet unit (118). The power supply unit (112) is configured to increase the temperature of the heating medium (108) and to circulate a pulsating electric current through the electrically conductive structure (110). The magnet unit (118) is configured to generate a magnetic field which interacts with the pulsating electric current, causing the base (102) to vibrate.