A system for cooling a mobile phone and method for using the system are described. The system includes an active piezoelectric cooling system, a controller and an interface. The active piezoelectric cooling system is configured to be disposed in a rear portion of the mobile phone distal from a front screen of the mobile phone. The controller is configured to activate the active piezoelectric cooling system in response to heat generated by heat-generating structures of the mobile phone. The interface is configured to receive power from a mobile phone power source when the active piezoelectric cooling system is activated.

A system for cooling a mobile phone and method for using the system are described. The system includes an active piezoelectric cooling system, a controller and an interface. The active piezoelectric cooling system is configured to be disposed in a rear portion of the mobile phone distal from a front screen of the mobile phone. The controller is configured to activate the active piezoelectric cooling system in response to heat generated by heat-generating structures of the mobile phone. The interface is configured to receive power from a mobile phone power source when the active piezoelectric cooling system is activated.

A system for cooling a mobile phone and method for using the system are described. The system includes an active piezoelectric cooling system, a controller and an interface. The active piezoelectric cooling system is configured to be disposed in a rear portion of the mobile phone distal from a front screen of the mobile phone. The controller is configured to activate the active piezoelectric cooling system in response to heat generated by heat-generating structures of the mobile phone. The interface is configured to receive power from a mobile phone power source when the active piezoelectric cooling system is activated.

A transport device (100) comprises a housing (110), an actuator (130) and a drive (150). The housing has a fluid inlet (111, 113) and a fluid outlet (113, 111). The actuator (130) comprises a magnetic shape-memory alloy, and the actuator (130) is arranged at least in sections in the housing (110). The actuator (130) can be deformed by the drive (150) in such a way that at least one cavity (135, 135′) for the fluid is formed in the actuator (130), which cavity can be moved by the drive (150 in order to transport the fluid in the cavity (135, 135′) from the fluid inlet (111, 113) to the fluid outlet (113, 111). At least one section of the actuator (130) has a separation layer (1380) by which a direct contact between the fluid and the actuator (130) is prevented in said section of the actuator (130).

The invention relates generally to electroactive material actuators (and combined sensor-actuators) having embedded magnetic particles (42) for facilitating enhanced actuation and/or sensing effects.

Exemplary practice of the present invention provides a magnetostrictive actuator characterized by linear force output and uniform magnetic biasing. A center bias magnet combined with a flux transfer tube produces a uniform magnetic bias down the length of a magnetostrictive component. Depending on the inventive embodiment, the magnetostrictive component may include one magnetostrictive element or a pair of collinear magnetostrictive elements. A center bias magnet, in combination with a flux transfer tube, drives magnetic flux through the magnetostrictive component (e.g., a series of magnetostrictive rods) in opposite directions, while surrounding drive coils apply flux in the same direction through the magnetostrictive component. The net response is substantially linear with respect to the drive coil current. The flux transfer tube applies distributed magnetic flux to the magnetostrictive component at a rate that ensures uniform magnetic flux density down the length of the magnetostrictive component.

A magnetic deformable member includes a magnetic portion formed of a magnetic elastic body, and a base portion formed of a non-magnetic elastic body to cover at least a side surface of the magnetic portion. At least the magnetic portion has a magnetic deformable portion in which shape deformation is caused by application of a magnetic field. The magnetic deformable portion is provided at a boundary-side end portion on the boundary with the base portion. A display portion in which the shape deformation is displayed is provided on a front surface s1 of the magnetic deformable member. With the magnetic deformable member, a tactile feel or viewability of the display portion can be varied by deforming the boundary between the magnetic portion and the base portion.

A positive-displacement pump device has at least one shape-memory unit including at least one magnetic shape-memory element, which is configured to convey at least one medium along at least one transport direction, wherein the positive-displacement pump device includes at least one deformation unit, which is configured, for the purpose of providing a transport volume, to deform the magnetic shape-memory element, at least in an idle state in which the positive-displacement pump device is free of a current and/or voltage supply, by a pressure force and/or traction force acting in the transport direction such that the magnetic shape-memory element includes at least one first partial region and at least one second partial region which differ from one another at least by their magnetic orientations.

A cooling system and method for using the cooling system are described. The cooling system includes a plurality of individual piezoelectric cooling elements spatially arranged in an array extending in at least two dimensions, a communications interface and driving circuitry. The communications interface is associated with the individual piezoelectric cooling elements such that selected individual piezoelectric cooling elements within the array can be activated based at least in part on heat energy generated in the vicinity of the selected individual piezoelectric cooling elements. The driving circuitry is associated with the individual piezoelectric cooling elements and is configured to drive the selected individual piezoelectric cooling elements.

The disclosure belongs to the technical field of additive manufacturing, and discloses a flexible piezoelectric sensor based on 4D printing and a preparation method thereof. The sensor includes a magnetic part and a conductive part, wherein: the conductive part includes two substrates disposed opposite to each other and a spiral structure disposed between the two substrates. Both the two substrates and the spiral structure are made of conductive metal materials. The magnetic part has a flexible porous structure and is arranged between the two substrates to generate a magnetic field. When the substrate is subjected to external pressure, the spiral structure and the magnetic part are compressed simultaneously, the magnetic flux passing through the spiral structure changes, and the voltage of the two substrates changes, by measuring the voltage change of the two substrates to reflect the change of external pressure, the pressure measuring process is achieved.