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Li Y.X.,University of Electronic Science and Technology of China | Chen D.M.,Hainan University | Han L.K.,University of Electronic Science and Technology of China | Ye J.,University of Electronic Science and Technology of China | And 2 more authors.
Materials Research Innovations | Year: 2015

In this paper, pure and indium-doped barium ferrite (BaInxFe12-xO19, x = 0, 1) thick films were fabricated by tape casting. X-ray diffraction and scanning electron microscopy results show that these BaM thick films have highly c-axis oriented crystallographic texture. Magnetic measurements indicated that pure samples exhibit excellent properties with a saturate magnetization (4πMs) of 3806G, a high squareness ratio (Mr/Ms) of 0•85. Ferromagnetic resonance measurements showed that the smallest ferromagnetic resonance line width is 383 Oe at 45 GHz. When indium was introduced, the hexagonal grains disappear, and the 4πMs is decreased to 3201G. The anisotropy field decreased from 15•9 to 12•2 kOe, and the smallest ferromagnetic resonance line width became 387 Oe at 30 GHz. These data meant that these thick films have high self-biased property and low microwave loss, which makes sure that these samples can be applied in self-biased microwave/millimeter wave devices such as filters, circulators and isolators. © W. S. Maney & Son Ltd 2015. Source


Zhou H.P.,University of Electronic Science and Technology of China | Zhou H.P.,Nanyang Technological University | Xu S.,Nanyang Technological University | Zhao Z.,University of Electronic Science and Technology of China | And 2 more authors.
Journal of Alloys and Compounds | Year: 2014

Al-doped ZnO (AZO) thin films deposited by means of RF magnetron sputtering were processed in a low frequency inductively coupled plasma of H2, aiming at heterojunction (HJ) solar cell applications. A variety of characterization results show that the hydrogen plasma processing exerts a significant influence on the microstructures, electrical and optical properties of the AZO films. The incorporation of hydrogen under the optimum treatment simultaneously promoted the transmittance and conductivity due to the hydrogen associated passivation effect on the native defects and the formation of shallow donors in the films, respectively. A p-type c-Si based HJ solar cell with a front AZO contact was also treated in as-generated non-equilibrium hydrogen plasma and the photovoltaic performance of the solar cell was prominently improved. The underlying mechanism was discussed in terms of the beneficial impacts of high-density hydrogen plasma on the properties of AZO itself and the hetero-interfaces involved in the HJ structure (interface defect and energy band configuration). © 2014 Elsevier B.V. All rights reserved. Source


Sun G.,University of Electronic Science and Technology of China | Liao D.,University of Electronic Science and Technology of China | Liao D.,Institute of Electronic and Information Engineering in Dongguan | Anand V.,New York University | And 2 more authors.
Future Generation Computer Systems | Year: 2016

Datacenter virtualization technologies have attracted a lot of attention to enable various cloud computing services and to facilitate virtual machine (VM) migration. VM migration can help service providers to achieve the goals of saving energy, enhancing resource efficiency and quality of service (QoS). In order to ensure the QoS, the migration time and the downtime of VM should be considered while implementing the VM migration. Most researches focus on the issue of single VM migration by using the post-copy migration strategy or pre-copy migration strategy. However, there is few research that focuses on the problem of live migration for multiple VMs. Therefore, in this paper, we first propose an improved serial migration strategy and introduce the post-copy migration scheme into it. We then propose the m mixed migration strategy that is based on the improved serial migration strategy and the parallel migration strategy. Furthermore, we develop queuing models (i.e., the M/M/C/C and the M/M/C queuing models) to quantify performance metrics, such as the blocking ratio and average waiting time of each migration request. We evaluate the performance of the proposed migration strategy by conducting mathematical analysis, the numerical results show that our proposed strategy outperforms the existing approach. © 2015 Elsevier B.V. Source


Zeng S.,University of Electronic Science and Technology of China | Li L.,University of Electronic Science and Technology of China | Liao D.,Institute of Electronic and Information Engineering in Dongguan
Applied Mathematics and Information Sciences | Year: 2013

In this paper, we develop a fluid model that seeks to expose the fundamental characteristics and mathematical theory of peerto- peer streaming system with transcoding. We find out and prove that, to provide peers receiving data above some flow rate, there is a lower bound of server upload bandwidth in this kind of system. We give a flow rate allocation algorithm to achieve the minimal server upload bandwidth in the proof. We compare this lower bound with the minimal demand of server upload bandwidth of no transcoding system. And, we prove that, the demand of server upload bandwidth in transcoding peer-to-peer streaming system using the proposed algorithm is the necessary (not sufficient) condition for the no transcoding one. At last, we give the simulations experiment to show the difference of server load in transcoding and no transcoding systems. © 2013 NSP Natural Sciences Publishing Cor. Source


Li Q.,University of Electronic Science and Technology of China | Li Y.X.,University of Electronic Science and Technology of China | Li Y.X.,Institute of Electronic and Information Engineering in Dongguan | Li J.,University of Electronic Science and Technology of China | And 2 more authors.
Materials Science Forum | Year: 2014

The ferrites (Ni0.2Cu0.2Zn0.6)1.02 (Fe2O4)0.98 were prepared by standard solid state method and sintered at different temperatures. The effects of different Bi2O3 additives (0 Source

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