Glimmer: Multilevel MDS on the GPU

We present Glimmer, a new multilevel algorithm for multidimensional scaling designed to exploit modern graphics processing unit (GPU) hardware. We also present GPU-SF, a parallel, force-based subsystem used by Glimmer. Glimmer organizes input into a hierarchy of levels and recursively applies GPU-SF to combine and refine the levels. The multilevel nature of the algorithm makes local minima less likely while the GPU parallelism improves speed of computation. We propose a robust termination condition for GPU-SF based on a filtered approximation of the normalized stress function. We demonstrate the benefits of Glimmer in terms of speed, normalized stress, and visual quality against several previous algorithms for a range of synthetic and real benchmark datasets. We also show that the performance of Glimmer on GPUs is substantially faster than a CPU implementation of the same algorithm.     

Development and Experimental Demonstration of a Self-Powered ETO (SPETO)

This paper presents the design and experimental demonstration of a superior high-power-device self-powered emitter turn-off thyristor (SPETO). Different from conventional high-power devices which require external power input for their gate drivers, the SPETO achieves optically controlled turn on and turn off, and all of the internal power required is self-obtained. A low-loss gate-drive circuit is implemented which allows the simple power-up operation. During a normal switching operation, the SPETO obtains a power for the gate drive during its turn-on operation. A novel switching strategy is also introduced to minimize the gate-drive power requirement. The SPETO greatly reduces costs and increases the reliability of power converters since no external power supply for device gate drive is required. Therefore, the SPETO is suitable for high-power high-frequency voltage-source-converter applications     

消息推送在移动高级应用中的研究与实现

为了使移动终端用户能够及时查看到电力业务更新消息,提出消息推送技术在移动高级应用中的研究。首先介绍消息推送的实现方式及原理,然后就iOS与Android系统两大主流移动系统平台的消息推送机制进行研究,提出在两大主流移动系统平台上实现消息推送的解决方案,并在企业移动驾驶舱的高级应用中实现消息推送,使终端用户能够实时查看到更新的消息。     

Structural transformations in surface layers of amorphous ribbons Ni78SixB22−x

The thermal stability of NI₇₈Si_xB_22–x (x = 6, 9, 12, 15) metallic glasses, produced by the single-roll melt spinning method, has been investigated by differential thermal analysis (DTA) and by measuring the temperature dependences of the exoelectron emission (EEE) and contact potential difference (CPD) relative to platinum. It has been found that both CPD and EEE show anomalies at temperatures corresponding to the structural transformations in the surface layer of investigated materials. The surface crystallization occurs at temperature of 150 K lower than the volume crystallization. The activation energy for the surface crystallization is also distinctly lower than that for crystallization in bulk.     

基于网络学堂辅助高等数学教学的应用性研究简

本文针对网络学堂如何辅助高等数学课堂教学进行了研究,介绍了建设高等数学网络学堂的必要性,提出了建设高等数学网络学堂的途径,最后探讨了如何利用网络学堂提高高等数学教学质量。     

Constraints on Models of Electrical Transport in Optimally Doped La2?xSrxCuO4 from Measurements of Radiation-Induced Defect Resistance

Precise measurements of the temperature dependence of additional resistivity caused by defect scattering were used to constrain models of carrier transport in La_1.84Sr_0.16CuO₄. Where previous magnetotransport studies have delineated two distinct scattering processes, proportional to T and T ², respectively, the new defect scattering results suggest strongly that the two processes act as parallel conductance channels.