Abstract: A drive circuit and a piezoelectric actuator. The drive circuit includes: a buck-boost circuit configured to operate in a corresponding voltage regulation mode according to a control signal for voltage regulation, to convert an input voltage into an unipolar folded signal and output the folded signal; a full-bridge inverter circuit configured to invert polarities of part of the folded signal according to a polarity inversion signal, so as to expand the folded signal into a target drive signal and output the target drive signal; and a control circuit configured to generate the control signal for voltage regulation and the polarity inversion signal according to a reference signal. The buck-boost circuit may output the unipolar folded signal according to the control signal for voltage regulation without adding an additional compensation circuit, and finally output the target drive signal through the full-bridge inverter circuit.

Abstract: The invention discloses a sand storage device, which comprises a tank with a sand inlet and outlet. The inlet has a sand adding valve composed of a valve body connected to the inlet, with a first port linked to the inlet and a second port sealed by a deformation sealing sheet attached to a counterweight block. An air inlet is located below the counterweight, directing air toward it. The sand inlet connects to a sand adding tank. The counterweight block drives the sealing sheet downward to open the second port. When air is drawn in, compressed air from the intake nozzle pushes the counterweight and sealing sheet upward, sealing the second port.

Abstract: A selective etching solution for a 3D NAND structure sheet is provided. The etching solution includes phosphoric acid, a silane additive 1, a silane additive 2, and water. The etching solution provided by the present invention has etching selectivity on a silicon oxide film and a silicon nitride film, can selectively remove the silicon nitride film and prolong the life of the etching solution, and can adapt to etching of a laminated structure.

Abstract: The embodiments of the present disclosure relate to the technical field of cosmetics, and disclose a composition capable of enhancing an expression efficacy of an antioxidant enzyme and use thereof. The composition includes a Curcuma Longa (Turmeric) root extract and dimethylmethoxy chromanol, wherein a mass fraction ratio of the Curcuma Longa (Turmeric) root extract to the dimethylmethoxy chromanol is (0.5-3):1. A synergistic effect can be achieved in terms of promoting the expression efficacy of an antioxidant enzyme by mixing the Curcuma Longa (Turmeric) root extract and the dimethylmethoxy chromanol at a specific mass fraction ratio. Therefore, the use of the composition according to the present disclosure with the effect of promoting the expression of antioxidant enzymes in a cosmetics product and/or skin care product exerts significant skin antioxidant and anti-aging effects at a lower application amount.

Abstract: The present disclosure relates to the technical field of cosmetics and discloses a retinol derivative composition and use thereof. The present disclosure provides the retinol derivative composition, including hydroxypinacolone retinoate and retinyl propionate, wherein the ratio of the hydroxypinacolone retinoate to the retinyl propionate in parts by mass is (5-40):9. The present disclosure utilizes the synergistic effect of the hydroxypinacolone retinoate and the retinyl propionate, can extremely significantly increase the expressions of important series of proteins related to aging, and has no cytotoxicity. Therefore, when the retinol derivative composition provided by the present disclosure is used in cosmetics and/or skin care products, the composition can reach a significant anti-aging effect with a low application amount and less skin irritation.

Abstract: Connecting a product to a monitoring system is described. In a computer-implemented method, meta information of each entity that serves as a hardware basis of each functional part is determined based on each functional part comprised in a to-be-connected product. Based on the meta information of each entity, a model of each entity is constructed that is expressed in a form of a dimension table and that corresponds to each entity. Corresponding meta information content is obtained from the to-be-connected product based on meta information in the model of each entity. A monitoring task is configured based on the model of each entity and a functional part to which each entity belongs. The to-be-connected product is monitored based on the monitoring task and meta information content in the model of each entity.

Abstract: Provided are a gas insulated switchgear (GIS) internal video monitoring system and a GIS internal video monitoring method. The GIS internal video monitoring system includes a GIS video sensor installed on a GIS enclosure and configured to acquire an open/close state of a GIS internal conductor in a real time manner, an intelligent power source module, a video server, and a video monitoring background system configured to control the intelligent power source module to supply power to the video sensor, where the GIS video sensor is connected with the video monitoring background system through the video server.

Abstract: The present disclosure relates to a method for preparing high-performance melamine foam, comprising the following steps: preparing a primary polymer of waterborne melamine formaldehyde resin; uniformly mixing the primary polymer of the waterborne melamine formaldehyde resin, the polar solvent, the surfactant and the additive to obtain a mixture A; uniformly mixing the mixture A with the solid methylol melamine to obtain a mixture B; uniformly mixing the mixture B with the foaming agent to obtain a mixture C; uniformly mixing the mixture C with the curing agent to obtain a mixture D; and carrying out microwave radiation, foaming, curing, drying and quenching on the mixture D in a microwave foaming device to obtain the high-density melamine foam. The melamine foam described in the present invention has high density and high strength performance.

Abstract: The present disclosure relates to a method for preparing high-performance melamine foam, comprising the following steps: preparing a primary polymer of waterborne melamine formaldehyde resin; uniformly mixing the primary polymer of the waterborne melamine formaldehyde resin, the polar solvent, the surfactant and the additive to obtain a mixture A; uniformly mixing the mixture A with the solid methylol melamine to obtain a mixture B; uniformly mixing the mixture B with the foaming agent to obtain a mixture C; uniformly mixing the mixture C with the curing agent to obtain a mixture D; and carrying out microwave radiation, foaming, curing, drying and quenching on the mixture D in a microwave foaming device to obtain the high-density melamine foam. The melamine foam described in the present invention has high density and high strength performance.

Abstract: Provided are a gas insulated switchgear (GIS) internal video monitoring system and a GIS internal video monitoring method. The GIS internal video monitoring system includes a GIS video sensor installed on a GIS enclosure and configured to acquire an open/close state of a GIS internal conductor in a real time manner, an intelligent power source module, a video server, and a video monitoring background system configured to control the intelligent power source module to supply power to the video sensor, where the GIS video sensor is connected with the video monitoring background system through the video server.

Abstract: The present invention discloses high-density melamine foam, which comprises the following raw materials; a primary polymer of waterborne melamine formaldehyde resin, solid methylol melamine, a polar solvent, a surfactant, a foaming agent, a curing agent and an additive.

Abstract: A probe of a detector includes a shield, an anode member, and a cathode member. The shield includes a top wall and a plurality of sidewalls extending down from the sides of the top wall. A first through hole and a second through hole are defined in the top wall. The anode member includes a first mounting portion, a first pin, and a first connecting portion connected between the first mounting portion and the first pin. The cathode member includes a second mounting portion, a second pin, and a second connecting portion connected between the second mounting portion and the second pin. The first and second mounting portions are respectively rotating within the first and second through holes to adjust corresponding ends of the first and second pins to come in contact with the electronic component.

Abstract: A probe of a detector includes a shield, an anode member, and a cathode member. The shield includes a top wall and a plurality of sidewalls extending down from the sides of the top wall. A first through hole and a second through hole are defined in the top wall. The anode member includes a first mounting portion, a first pin, and a first connecting portion connected between the first mounting portion and the first pin. The cathode member includes a second mounting portion, a second pin, and a second connecting portion connected between the second mounting portion and the second pin. The first and second mounting portions are respectively rotating within the first and second through holes to adjust corresponding ends of the first and second pins to come in contact with the electronic component.