Abstract: Disclosed is a preparation method for tricalcium silicate powder. The method includes the following steps: taking CaCO3 powder and SiO2 powder as raw materials for preparation, so as to obtain mixed powder having uniform components; pre-pressing the obtained mixed powder to make a blank; and performing sintering treatment on the obtained blank at a temperature of 1,200 DEG C-1,500 DEG C for 0.5 h-1.5 h, so as to obtain tricalcium silicate, where the sintering treatment is to perform mixed sintering by using auxiliary heating bodies and in cooperation with microwave treatment. According to the present disclosure, the tricalcium silicate is prepared through mixed sintering by using the auxiliary heating bodies and in cooperation with the microwave treatment, and a mixed heating mechanism enables a sample to be heated more easily at a low temperature, so that synthesis purity and efficiency are improved.

Abstract: A hybrid compensation system is electrically connected between a power grid and a load. The hybrid compensation system includes an active filter, a passive filter and a control unit. The active filter generates an output current. The active filter includes a switching circuit, a DC bus capacitor and a filtering inductor. The control unit includes a voltage controller, a first reactive current detector, a harmonic current compensator, a current loop controller and a modulator. The voltage controller generates a first current given signal according to a bus voltage of the DC bus capacitor and a reference voltage. The first reactive current detector generates a second current given signal. The harmonic current compensator generates a third current given signal. The current loop controller generates a control signal. The modulator generates a driving signal according to the control signal.

Abstract: A device capability discovery method and a P2P device are provided, and relate to the communications field and the distributed hardware field, to shorten time consumed to obtain capability information of a discovered device. A P2P device receives a probe request frame from another device. The P2P device returns a probe response frame including capability information of the P2P device. A device that receives the probe response frame can obtain a capability of the device in a device discovery phase. Alternatively, a P2P device sends a probe request frame including capability information of the P2P device to another device, so that the another device can obtain a capability of the device in a device discovery phase.