Fabrication and transport critical currents of multifilamentary MgB2/Fe wires and tapes

Multifilamentary MgB2/Fe wires and tapes with high transport critical current densities have been fabricated using a straightforward powder-in-tube (PIT) process. After annealing, we measured transport jc values up to 1.1 * 105 A/cm2 at 4.2 K and in a field of 2 T in a MgB2/Fe square wire with 7 filaments fabricated by two-axial rolling, and up to 5 * 104 A/cm2 at 4.2 K in 1 T in a MgB2/Fe tape with 7 filaments. For higher currents these multifilamentary wires and tapes quenched due to insufficient thermal stability of filaments. Both the processing routes and deformation methods were found to be important factors for fabricating multifilamentary MgB2 wires and tapes with high transport jc values.Comment: 13 pages, 7 figure

On the demand and behavior characteristics of “new tourists”— Content analysis based on Web Text

With the development of information technology and the popularization of Internet applications, the proportion of tourists traveling with groups continues to decline, free travel has become the main form of travel, and the team of new tourists continues to grow and develop. This paper selects the travel notes of tourists as the research object, takes Xi’an as the tourism destination, collects samples, uses the content analysis method and applies the Rost CM6 software for in-depth analysis, obtains the tourism attractions and service facilities that tourists pay the most attention to, constructs the social semantic network of Xi’an tourism, and infers the needs and behavior characteristics of new tourists from the aspects of tourism viewing, tourism communication and tourists’ consumption, It also puts forward suggestions on the operation and marketing activities of tourism destinations and tourism enterprises.