Abstract: A flyback circuit and a control method of a clamping switch of the flyback circuit are provided. The flyback circuit includes a transformer, a main switch, a clamping capacitor, a clamping switch, and a secondary rectifier unit. The transformer includes primary and secondary windings with a turns ratio of K. The main switch and the primary winding are connected in series to receive an input voltage. The clamping switch and the clamping capacitor are connected in series and then connected to the primary winding in parallel. The secondary rectifier unit and the secondary winding are connected in series to provide an output voltage to a load. The control method includes: when a product of K and the output voltage is greater than or equal to the input voltage, controlling the clamping switch to turn on M times during N consecutive switching cycles of the main switch, where I?M<N.

Abstract: A single folding sofa bedstead includes a bedstead frame body, a frame assembly, a first connecting rod assembly, a second connecting rod assembly, a first linkage rod group, and a second linkage rod group. The frame assembly has a first frame, a second frame, and a third frame. The first frame is pivotally connected to one side of the second frame, and the third frame is pivotally connected to the other side of the second frame. One end of the first connecting rod assembly is pivotally connected to the first frame, and the other end of the first connecting rod assembly is pivotally connected to the bedstead frame body. One end of the second connecting rod assembly is pivotally connected to the second frame, and the other end of the second connecting rod assembly is pivotally connected to the bedstead frame body.

Abstract: A self-locking mechanism and a folding sofa are provided. The self-locking mechanism includes a support member, a locking member, a drive member and a switch member. The support member has a first end and a second end opposite to each other. The locking member has a first connection portion and a locking portion, and the first connection portion of the locking member is pivotally connected to the first end of the support member. One end of the drive member is pivotally connected to the first connection portion of the locking member. The switch member has a second connection portion and a switch portion, where the second connection portion of the switch member is pivotally connected to the second end of the support member and the other end of the drive member.

Abstract: Disclosed are a class of compounds having a new structure as an ATR inhibitor, and a stereoisomer, an optical isomer, a pharmaceutical salt, a prodrug and a solvate thereof. An in-vitro enzyme inhibitory activity study shows that the compounds have a strong inhibitory effect on an ATR enzyme, and can be used as prospecting compounds for treating ATR-mediated diseases.

Abstract: A novel hinge and an inward-folding flexible screen mobile terminal. Each of a left structure and a right structure of the hinge includes a mechanism consisting of a push-pull rod and a fixed base and used for pushing and pulling a housing connecting member to slidably move, a rotating member, a rotating guide rail, and a rotary supporting plate; the rotating member is slidably connected to the housing connecting member; the rotating guide rail is rotatably connected to the fixed base; the outer side end of the rotary supporting plate is a rotary connecting end and connected to the housing connecting member, and the rotary supporting plate is slidably connected to the rotating guide rail, so that the rotary supporting plate can rotate together with the housing connecting member, coaxially rotate with the rotating guide rail, and slide with respect to the rotating guide rail.

Abstract: Provided in the present invention are a hinge with a lifting drive control function and an inward-folding flexible screen mobile terminal. A left structure and a right structure of the hinge each comprise a rotating member; a rotary connecting end of the rotating member is provided with a supporting portion; and the supporting portion is configured to jack, when the flexible screen mobile terminal is unfolded, lifting plates which are above the supporting portions of the left structure and the right structure. The hinge is further provided with a spring for pulling the lifting plates downwards, so that when the flexible screen mobile terminal is folded, the lifting plates descend under the action of the downward pulling force of the spring.

Abstract: The present disclosure relates to a method for preparing high-temperature superconducting yttrium barium copper oxide (YBCO) wire by 3D-printing, this method is divided into the following four steps: firstly, preparing a nano-level superconducting powder precursor; and then, preparing a printing paste with suitable viscosity and supporting characteristics; after that, using a CAD 3D modeling, exporting STL format model data and slicing by a professional software; implementing one-step preparing strands with low AC loss by twisting the print nozzle. Finally, the printed twisted wire is formed into a practical superconducting twisted cable through the processes such as plastic removal process, crystallizing process, oxygen supplementing process and assembling process in order. The present disclosure firstly provides an application for applying high temperature superconducting material to direct ink writing 3D-printing technology.

Abstract: The present disclosure relates to a method for preparing high-temperature superconducting yttrium barium copper oxide (YBCO) wire by 3D-printing, this method is divided into the following four steps: firstly, preparing a nano-level superconducting powder precursor; and then, preparing a printing paste with suitable viscosity and supporting characteristics; after that, using a CAD 3D modeling, exporting STL format model data and slicing by a professional software; implementing one-step preparing strands with low AC loss by twisting the print nozzle. Finally, the printed twisted wire is formed into a practical superconducting twisted cable through the processes such as plastic removal process, crystallizing process, oxygen supplementing process and assembling process in order. The present disclosure firstly provides an application for applying high temperature superconducting material to direct ink writing 3D-printing technology.