Abstract: An earphone box includes a box body and a box magnet. The box body defines an accommodating groove configured to accommodate the earphone, and the accommodating groove is provided with an interface configured to be electrically coupled to the earphone. The box magnet is mounted on the box body and configured as a multipole magnet, the earphone is provided with an earphone magnet with the same number of poles as the box magnet, and the earphone magnet attracts and couples with the box magnet.

Abstract: Disclosed is an electrical topology of an integrated DC charging station and an operation control method. The electrical topology comprises a supply side DC bus, K discrete charging pile units and a mutual aid total DC bus; each charging pile unit comprises an input DC bus, a mutual aid sub-DC bus, an output DC bus, N isolation branches, a non-isolation DC/DC module and an output terminal, the input DC bus is connected to the supply side DC bus, and the mutual aid sub-DC bus of each charging pile unit is connected to the mutual aid total DC bus; the isolation branch comprises an output branch and a mutual aid branch; and when all the output branches of one charging pile, unit are started and the output power cannot meet the required power, the mutual aid branches of other charging pile units are started to meet the required power.

Abstract: The invention relates to a polyurethane composition for preparing composites, a polyurethane composite obtained by the preparation and a method for preparing the polyurethane composite. The polyurethane composition comprises: a) an isocyanate component; b) an isocyanate-reactive component; c) a radical reaction initiator and d) an organometallic catalyst; wherein the hydroxyl value of the component b) isocyanate-reactive component is 200 mgKOH/g to 700 mgKOH/g, and the molar ratio of isocyanate groups to hydroxyl groups of the composition is 0.6 to 1.5. The polyurethane composition of the present invention has the advantages of long pot life and simple operation process. The polyurethane composite comprising the polyurethane resin matrix prepared by the polyurethane composition of the present invention has both excellent weather resistance and mechanical strength.

Abstract: A combined platform for testing fireproof materials for cables includes a main frame for providing operating space; an air circulation system including a fresh air supply unit for supplying fresh air into the operating space and an exhaust gas treatment unit for treating the gas in the operating space under set conditions; an open flame system for providing an open flame for testing cables; a water circulation system for supplying water at least to the exhaust gas treatment unit and the operating space; and a control system for collecting at least the temperature and gas concentration in the operating space, and performing process control based on the collected results. The actual working conditions of scenarios such as fire-resistant cable tunnels and fire-resistant cable trenches can be simulated, and multiple tests such as combustion performance test and physical and chemical performance test can be carried out under various working conditions.

Abstract: A mask plate and manufacturing method thereof, a mask assembly and a vapor deposition apparatus are provided. The mask plate includes a mask pattern region, and a peripheral region of the mask pattern region, the peripheral region including a recess structure, and a recess direction of the recess structure being parallel to a thickness direction of the mask plate. When the glass substrate is superposed on the mask plate, the force suffered by the glass substrate at the weld pad is reduced, and the probability of scratching the glass substrate is lowered.

Abstract: A mask plate and manufacturing method thereof, a mask assembly and a vapor deposition apparatus are provided. The mask plate includes a mask pattern region, and a peripheral region of the mask pattern region, the peripheral region including a recess structure, and a recess direction of the recess structure being parallel to a thickness direction of the mask plate. When the glass substrate is superposed on the mask plate, the force suffered by the glass substrate at the weld pad is reduced, and the probability of scratching the glass substrate is lowered.