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.

Abstract: A design method of tangential gradient thermal spraying coating for complex profile workpieces solves the erosion-resistant problem, and obtains a corresponding relation between the ductile-brittle ratio of the thermal sprayed coating and the impact angle change. The method includes: determining the complex profile part surface impact angle change rule according to the part operation environment conditions; selecting an erosion-resistant coating material according to the service condition requirement; obtaining the relation among the impact angle, ductile-brittle angle and erosion rate of the coating by an erosion test; determining the coating and the impact angle ductile-brittle corresponding relation curve; and performing spraying by using dual-channel powder feeding thermal spraying equipment the powder feeding quantity of which is adjustable in real time, based on a matching relation between the tangential gradient coating and the surface impact angle.

Abstract: A method and device are described for implementing instant communication. Information indicating that a first user is logged into an instant communication interface is obtained. On-line users are displayed to the first user in response to the login of the first user. A first user selects an object to follow from the on-line users and, information about the selected object to follow is received in response to the first user selecting the object to follow from the on-line users. The first user may be set into a first instant communication room in which the selected object to follow resides, for performing instant communication. The device includes: an obtaining module, a displaying module and a processing module. In this manner communication between strangers is facilitated and the efficiency of making friends is enhanced.

Abstract: A design method of tangential gradient thermal spraying coating for complex profile workpieces solves the erosion-resistant problem, and obtains a corresponding relation between the ductile-brittle ratio of the thermal sprayed coating and the impact angle change. The method includes: determining the complex profile part surface impact angle change rule according to the part operation environment conditions; selecting an erosion-resistant coating material according to the service condition requirement; obtaining the relation among the impact angle, ductile-brittle angle and erosion rate of the coating by an erosion test; determining the coating and the impact angle ductile-brittle corresponding relation curve; and performing spraying by using dual-channel powder feeding thermal spraying equipment the powder feeding quantity of which is adjustable in real time, based on a matching relation between the tangential gradient coating and the surface impact angle.

Abstract: A method and device are described for implementing instant communication. Information indicating that a first user is logged into an instant communication interface is obtained. On-line users are displayed to the first user in response to the login of the first user. A first user selects an object to follow from the on-line users and, information about the selected object to follow is received in response to the first user selecting the object to follow from the on-line users. The first user may be set into a first instant communication room in which the selected object to follow resides, for performing instant communication. The device includes: an obtaining module, a displaying module and a processing module. In this manner communication between strangers is facilitated and the efficiency of making friends is enhanced.

Abstract: A method and device are described for implementing instant communication. Information indicating that a first user is logged into an instant communication interface is obtained. On-line users are displayed to the first user in response to the login of the first user. A first user selects an object to follow from the on-line users and, information about the selected object to follow is received in response to the first user selecting the object to follow from the on-line users. The first user may be set into a first instant communication room in which the selected object to follow resides, for performing instant communication. The device includes: an obtaining module, a displaying module and a processing module. In this manner communication between strangers is facilitated and the efficiency of making friends is enhanced.

Abstract: A method and device are described for implementing instant communication. Information indicating that a first user is logged into an instant communication interface is obtained. On-line users are displayed to the first user in response to the login of the first user. A first user selects an object to follow from the on-line users and, information about the selected object to follow is received in response to the first user selecting the object to follow from the on-line users. The first user may be set into a first instant communication room in which the selected object to follow resides, for performing instant communication. The device includes: an obtaining module, a displaying module and a processing module. In this manner communication between strangers is facilitated and the efficiency of making friends is enhanced.