Superconducting Properties and Microstructure in MgB2 Bulks, Wires and Tapes

We prepared a series of MgB2 bulk samples under different temperatures, holding time and increasing rates in temperature by the solid state reaction. The thermodynamic behavior and phase formation in the Mg-B system were studied by using DTA, XRD and SEM. The results indicate that the formation of the MgB2 phase is very fast and the high increasing rate in temperature is necessary to obtain high quality MgB2. In addition, the effects of the Zr-doping in Mg1-xZrxB2 bulk samples fabricated by the solid state reaction at ambient pressure on phase compositions, microstructure and flux pinning behavior were investigated by using XRD, SQUID magnetometer, SEM and TEM. Critical current density Jc can be significantly enhanced by the Zr-doping and the best data are achieved in Mg0.9Zr0.1B2. For this sample, Jc values are remarkably improved to 1. 83 × 106 A/cm2 in self-field and 5. 51 × 105 A/cm2in 1T at 20K. Also, high quality MgB2/Ta/Cu wires and tapes with and without Ti-doping, MgB2/Fe wires and 18 filamen     

适于IP设计的定点DSP软件开发系统

描述了一种本实验室开发的适合于IP(IntellectualProperty)设计的DSP(DigitalSignalProcess)处理器核WDSP(以主要开发者姓Wu命名Wu′sDSP)的软件开发系统。这一开发系统将使根据不同DSP应用产生不同DSP处理器核成为可能。此外,WDSP还将作为一个核心部件应用于本实验室正在开发的称为FDP(FPGAforDataPath)的FPGA(FieldProgrammableGateArrays)系统中,以适应当前普遍采用的IP和SoC(SystemonChip)设计方法。