An element including: a first electrode; an intermediate layer made of a silicone rubber composition containing a silicone rubber; and a second electrode, where the first electrode, the intermediate layer, and the second electrode are disposed in this order, wherein a peak intensity ratio (1095±5 cm.sup.−1/1025±5 cm.sup.−1) of an infrared absorption spectrum of the intermediate layer varies along a vertical direction relative to a surface of the first electrode, and to a surface of the second electrode.

A flexible sensor is provided which has a flexible substrate of polymeric material, a bottom electrode layer arranged on the flexible substrate and configured to be a reference electrode, an active layer of piezoelectric material arranged on the bottom electrode layer, a top electrode layer arranged on the active layer and configured to be connected to a signal conductor, and a flexible coating layer of polymeric material that cooperates with the flexible substrate to encapsulate the bottom electrode layer, the active layer, and the top electrode layer. The flexible sensor has an additional layer of metal material arranged on the flexible coating layer and short-circuited to the bottom electrode layer, the additional layer and the bottom electrode layer acting as an electromagnetic shield for the flexible sensor.

A device for harvesting motion energy, the device including an outer structure, a plurality of piezoelectric units including a permanent source of electromagnetic field (magnet or electret) attached to a piezoelectric material, where each of the piezoelectric units is fixed, at least in part, to the outer structure, an inner structure located inside the outer structure, the inner structure including a plurality of permanent sources of electromagnetic field (magnets or electrets) fixed to a rigid frame, the inner structure is configured to be suspended within the outer structure due to mutual electromagnetic forces acting between permanent sources of electromagnetic field pertaining to the piezoelectric units and permanent sources of electromagnetic field pertaining to the inner structure, and an electric circuit configured to store or provide electric energy supplied by the piezoelectric units due to strain caused by relative motion between the outer structure and the inner structure.

A device for harvesting motion energy, the device having an outer structure, multiple piezoelectric units having a permanent source of electromagnetic field (magnet or electret) attached to a piezoelectric material, where each of the piezoelectric units is fixed, at least in part, to the outer structure, where the inner structure is configured to be free to move within the outer structure, and an electric circuit configured to store or provide electric energy supplied by the piezoelectric units due to strain caused by relative motion between the outer structure and the inner structure.

Emergency stop pressure sensors 17 are installed on both side surfaces of a movable link 11 of a robot arm 14 of an assembly robot. When a worker S unintentionally walks in a swing range Ra of the robot arm 14 and contacts the emergency stop pressure sensor 17, a detection signal is transmitted to a control unit 19, and the control unit 19 shuts power transmission to a driving source swinging the robot arm. The emergency stop pressure sensor 17 has a first electrode and a second electrode constituting a pair of electrodes and an intermediate layer formed of rubber or a rubber composition, which is disposed between the pair of electrodes, the intermediate layer generating power upon deformation caused by contact with a contacted body (the worker). A side of the intermediate layer in a laminate direction undergoes surface modification treatment and/or inactivation treatment. With this treatment, the one side and the other side of the intermediate layer have different degrees of deformation to the same deformation adding force.

Disclosed are a flexible display panel, a flexible display device and a deformation detection method thereof, used for detecting deformation of the flexible display panel. The flexible display panel provided by embodiments of the present disclosure includes a flexible substrate, a display device and a piezoelectric sensor arranged in a stacked mode. The piezoelectric sensor includes a first electrode, a second electrode, and a piezoelectric layer positioned between the first electrode and the second electrode; the piezoelectric sensor is configured to generate an electrical signal under the action of stress produced by bending the flexible display panel; and a signal processing chip in the flexible display device is configured to determine deformation parameters of the flexible display panel according to the electrical signal.

A piezoelectric energy hunting device and a voltage signal application system thereof are disclosed. The piezoelectric energy hunting device includes a plurality of curved piezoelectric elements, a plurality of rigid foams, and a flexible foam structure. The plurality of curved piezoelectric elements are arranged side by side with one another, wherein each curved piezoelectric element is attached to one of the rigid foams. The flexible foam structure includes a top foam and a bottom foam covering the outer surface of the plurality of curved piezoelectric elements and the plurality of rigid foams; when the flexible foam structure is compressed, the plurality of curved piezoelectric elements are simultaneously deformed, thereby generating a voltage signal. When the flexible foam structure is not compressed, the flexible foam structure and the plurality of rigid foams provide an elastic force to restore the plurality of curved piezoelectric elements.

A plurality of sensors and a controller are disposed in a marine seismic streamer. Each of the sensors comprises an enclosure having two opposing interior walls, first and second piezoelectric elements disposed on the opposing interior walls, a third piezoelectric element disposed on a flexible substrate within the enclosure between the opposing interior walls, a pressure signal output node and an acceleration signal output node disposed on the exterior surface of the enclosure. A combined pressure signal derived from the pressure signal output nodes of the plural sensors is coupled to a pressure signal input of the controller. A combined acceleration signal derived from the acceleration signal output nodes of the plural sensors is coupled to an acceleration signal input of the controller. The streamer may be towed, and the combined pressure and acceleration signals may be recorded in a computer-readable medium.

An ultrasonic sensor, a preparation method of the ultrasonic sensor, and a display apparatus are provided. The ultrasonic sensor includes a texture recognition region and a contrast region. The contrast region is located on at least one side of the texture recognition region. The texture recognition region includes at least one recognizing unit, and the contrast region includes at least one contrast unit. The at least one recognizing unit includes a first dielectric material layer, and the at least one contrast unit includes a second dielectric material layer. The first dielectric material layer and the second dielectric material layer are made of a same material. The first dielectric material layer exhibits piezoelectric properties. A piezoelectric strain constant of the first dielectric material layer is greater than a piezoelectric strain constant of the second dielectric material layer.

A power generation device manufacturing method and a power generation device are proposed. In one embodiment, the method includes (a) forming a halide perovskite active layer on a flexible substrate bent by a stress applied thereto and (b) releasing the stress applied to the substrate on which the halide perovskite active layer is formed, thereby unfolding the bent substrate. By applying a strain to the active layer of the power generation device and controlling the same, using the method described above, it is possible to improve the performance of the power generation device without changing the composition of the active layer or the configuration of the device.