Abstract: An aspect of the disclosure includes a communication system and a communication method using reconfigurable intelligent surface and a reconfigurable intelligent surface device. The communication system includes at least one base station, a reconfigurable intelligent surface device, and a control at one least device. The at least one base station respectively transmits at least one beam. The reconfigurable intelligent surface device is coupled to the at least one base station, and measures the at least one beam of the at least one base station to obtain signal measurement results associated with each of the at least one base station. The control device is coupled to the at least one base station. The control device groups the at least one base station and the reconfigurable intelligent surface device into at least one group according to the signal measurement results associated with each of the at least one base station.

Abstract: The present disclosure provides a semiconductor structure with having a source/drain feature with a central cavity, and a source/drain contact feature formed in central cavity of the source/drain region, wherein the source/drain contact feature is nearly wrapped around by the source/drain region. The source/drain contact feature may extend to a lower most of a plurality semiconductor layers.

Abstract: The present disclosure provides an electronic wearable device. The electronic wearable device includes a first module having a first contact and a second module having a second contact. The first contact is configured to keep electrical connection with the second contact in moving with respect to each other during a wearing period.

Abstract: Exfoliated nanoplatelets functionalized with a non-polar moiety, such as an ethylene or propylene derived polymer, are useful for forming composites, films, and polymer blends.

Abstract: A supported metallocene catalyst includes a carrier and a metallocene component. The carrier includes an inorganic oxide particle and an alkyl aluminoxane material. The inorganic oxide particle includes at least one inorganic oxide compound selected from the group consisting of an oxide of Group 3A and an oxide of Group 4A. The alkyl aluminoxane material includes an alkyl aluminoxane compound and an alkyl aluminum compound that is present in amount ranging from greater than 0.01 wt % to less than 14 wt % base on 100 wt % of the alkyl aluminoxane material. The metallocene component is supported on the carrier, and includes one of a metallocene compound containing a metal from Group 3B, a metallocene compound containing a metal from Group 4B, and a combination thereof. A method for preparing the supported metallocene catalyst and a method for preparing polyolefin using the supported metallocene catalyst are also disclosed.

Abstract: The disclosure is related to a coolant replenishment device, a cooling circulation system and an electronic device. The electronic device includes a heat source, a circulation pipe, a pump, a heat exchanger and a coolant replenishment device. The circulation pipe has a circulation channel configured to accommodate a first coolant. The pump is disposed on the circulation pipe. The heat exchanger disposed on the circulation pipe. The coolant replenishment device includes a liquid storage tank, a push plate and a driving member. The liquid storage tank has an accommodating space configured to accommodate a second coolant. The push plate is movable toward or away from the liquid outlet. The driving member is disposed in the liquid storage tank and constantly apply a force on the push plate to push the second coolant from the accommodating place into the circulation channel through the liquid outlet.

Abstract: The disclosure is related to a coolant replenishment device, a cooling circulation system and an electronic device. The electronic device includes a heat source, a circulation pipe, a pump, a heat exchanger and a coolant replenishment device. The circulation pipe has a circulation channel configured to accommodate a first coolant. The pump is disposed on the circulation pipe. The heat exchanger disposed on the circulation pipe. The coolant replenishment device includes a liquid storage tank, a push plate and a driving member. The liquid storage tank has an accommodating space configured to accommodate a second coolant. The push plate is movable toward or away from the liquid outlet. The driving member is disposed in the liquid storage tank and constantly apply a force on the push plate to push the second coolant from the accommodating place into the circulation channel through the liquid outlet.

Abstract: A control method of a fan comprises steps of: detecting a rotational speed of a blade and a rotor position of the blade; generating a control signal according to the rotational speed and a predetermined rotational speed; obtaining a Back-EMF waveform according to the control signal, the rotational speed, the rotor position and a waveform; adjusting the phase of the Back-EMF waveform; and outputting a switch control signal.

Abstract: A control method of a fan comprises steps of detecting a rotational speed of a blade and a rotor position of the blade; generating a control signal according to the rotational speed and a predetermined rotational speed; obtaining a Back-EMF waveform according to the control signal, the rotational speed, the rotor position and a waveform; adjusting the phase of the Back-EMF waveform; and outputting a switch control signal.