An active cooling system and method for using the active cooling system are described. The active cooling system includes a cooling element having a first side and a second side. The first side of the cooling element is distal to a heat-generating structure and in communication with a fluid. The second side of the cooling element is proximal to the heat-generating structure. The cooling element is configured to direct the fluid using a vibrational motion from the first side of the cooling element to the second side such that the fluid moves in a direction that is incident on a surface of the heat-generating structure at a substantially perpendicular angle and then is deflected to move along the surface of the heat-generating structure to extract heat from the heat-generating structure.

A peristaltic dosing device for providing dosages of a fluid at a volume of less than one milliliter comprises: a flexible tube, a counter pressure element, a plurality of actors and a drive. The flexible tube is essentially straightly arranged along the counter pressure element thereby forming a longitudinal axis. The actors arranged parallel to each other along the longitudinal axis. They are moveable by the drive in relation to the flexible tube. The flexible tube is compressible between the actors and the counter pressure element by moving the actors. Each of the actors is independently and linearly moveable by the drive along an actuation axis essentially perpendicular to the longitudinal axis of the flexible tube from a home position in which the flexible tube is least compressed to an end position in which the flexible tube is compressed and sealed between the respective actor and the counter pressure element. The peristaltic dosing device according to the invention allows for exactly and repeatably providing dosages at comparably small volumes in a sterile environment.

A portable device for monitoring environmental air quality includes a main body and at least one actuating and sensing module. The actuating and sensing module is disposed in the main body. The actuating and sensing module includes a carrier, at least one sensor, at least one actuating device, a driving and transmitting controller and a battery. The sensor, the actuating device, the driving and transmitting controller and the battery are disposed on the carrier. The actuating device is enabled to transport fluid to flow toward the sensor so as to make the fluid measured by the sensor and transmit an output data of the monitored data to a connection device. The information carried in the output data may be displayed, stored and transmitted by the connection device, whereby users can take precautions against the air pollution immediately to prevent from the ill influence on human health.

An active cooling system and method for using the active cooling system are described. The active cooling system includes a cooling element having a first side and a second side. The first side of the cooling element is distal to a heat-generating structure and in communication with a fluid. The second side of the cooling element is proximal to the heat-generating structure. The cooling element is configured to direct the fluid using a vibrational motion from the first side of the cooling element to the second side such that the fluid moves in a direction that is incident on a surface of the heat-generating structure at a substantially perpendicular angle and then is deflected to move along the surface of the heat-generating structure to extract heat from the heat-generating structure.

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 piezoelectric element includes: a substrate; a first electrode which is disposed on the substrate; a piezoelectric body layer which is disposed on the first electrode, which has a plurality of layers configured to contain a piezoelectric body material, and in which the total thickness of the plurality of layers is within a range of 1.6 m to 10 m; and an intermediate layer which is disposed on an interlayer of the piezoelectric body layer, and which is configured to contain titanium.

A pump device includes a piezoelectric pump, a piezoelectric pump, and a driving circuit. The piezoelectric pump is driven at a first frequency when singly driven. The piezoelectric pump is driven at a second frequency when singly driven. The driving circuit drives the piezoelectric pump and the piezoelectric pump at the same driving frequency.

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 miniature fluid control device for transporting gas is disclosed, which includes a gas inlet plate, a resonance plate, a piezoelectric actuator and a gas collecting plate stacked on each other. The gas inlet plate includes at least one inlet, at least one convergence channel and a circular cavity which forms a convergence chamber. The resonance plate has a central aperture. The piezoelectric actuator includes a suspension plate, an outer frame and a piezoelectric plate, wherein the suspension plate has a cylindrical bulge aligned with the circular cavity. The ratio of a second diameter of the cylindrical bulge to a first diameter of the circular cavity is set in a specified range to optimize the gas pressure of the transported gas, thus assuring efficiency of gas transmission of the miniature fluid control device.

A cuff pressure controller device (100) is connected to a foregoing cuff (10) via an air supply tube (125). The cuff pressure controller device (100) includes a controller unit (111), a cuff pressure detector unit (113), a driver circuit (119), a piezoelectric pump (101), a check valve (121), and a release valve (122). The cuff pressure detector unit (113) detects the cuff pressure of the cuff (10). The driver circuit (119) drives the piezoelectric pump (101) at a drive frequency of 20 kHz or higher. The controller unit (111) controls the cuff pressure detector unit (113), the driver circuit (119), and the release valve (122) in such a way that the cuff pressure stays within a predetermined range based on detection results of the cuff pressure detector unit (113) and the like.