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971.
Based on our study on field emission from multi-walled carbon nanotubes (MWNTs), we experimentally manufactured field emission display (FED) triode with a MWNTs cold cathode, and demonstrated an excellent performance of MWNTs as field emitters. The measured luminance of the phosphor screens was 1.8 × 103 cd/m2 for green light. The emission is stable with a fluctuation of only 1.5% at an average current of 260 μA. 相似文献
972.
Zu‐Shun Xu Zi‐Wei Deng Xiao‐Xi Hu Lei Li Chang‐Feng Yi 《Journal of polymer science. Part A, Polymer chemistry》2005,43(11):2368-2376
Monodisperse polystyrene microspheres with diameters of 200–500 nm were prepared by dispersion polymerization with microwave irradiation with poly(N‐vinylpyrrolidone) as a steric stabilizer and 2,2′‐azobisisobutyronitrile as a radical initiator in an ethanol/water medium. The morphology, size, and size distribution of the polystyrene microspheres were characterized with transmission electron microscopy and photon correlation spectroscopy, and the formed films of the polystyrene dispersions were characterized with atomic force microscopy. The effects of the monomer concentration, stabilizer concentration, and initiator concentration on the size and size distribution of the polystyrene microspheres were investigated. The polystyrene microspheres prepared by dispersion polymerization with microwave irradiation were smaller, more uniform, and steadier than those obtained with conventional heating. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 2368‐2376, 2005 相似文献
973.
ZHANG Jingfu XIE Jingyi DENG Zhiwei & LU Zhiheng Key Laboratory for Quantum Information Measurements Department of Physics Tsinghua University Beijing China Center for Quantum Information Tsinghua University Beijing China Department of Materials Science Engineering Beijing Normal University Beijing China Testing Analytical Center Beijing Normal University Beijing China Department of Physics Beijing Normal University Beijing China 《中国科学G辑(英文版)》2005,48(1):57-67
Dense coding using superpositions of Bell-states is proposed. The generalized Grover's algorithm is used to prepare the initial entangled states, and the reverse process of the quantum algorithm is used to determine the entangled state in the decoding measurement. Compared with the previous schemes, the superpositions of two Bell-states are exploited. Our scheme is demonstrated using a nuclear magnetic resonance (NMR) quantum computer. The corresponding manipulations are obtained. Experimental results show a good agreement between theory and experiment. We also generalize the scheme to transmit eight messages by introducing an additional two-state system. 相似文献
974.
We extend our previous treatment of a mixed ionic electronic conductor membrane, consisting of a porous cathode and anode separated by a thin non-porous layer, to the case where mass transport of molecules in the porous electrodes can be the rate-limiting step. The linearized transport equations for the ion-hole pairs in the solid and of the gas molecules in the pores are characterized by the length scales LP = √Ld(1 − φ)/Sτs and Lg = 2Lp√[τsφ/τ(1 − φ)][Dgcg/DIEci] respectively, where Ld = DIE/K is the length scale that determines the transition from diffusion limited to surface exchange limited transport in the non-porous electrodes, K is the surface exchange coefficient, DIE and Dg are the diffusion coefficients of the ion-hole pairs and of the molecules, ci and cg are the concentrations of the ions and molecules, S is the pore surface area per unit volume, φ the porosity and τs and τ the tortuosities of the solid and pore phases respectively. When Lg Lp, which is the case treated previously, the rate-limiting step in the transport is ionic diffusion and surface exchange. Enhancements in oxygen ion current of two orders in magnitude, over non-porous electrodes, are in principle achievable with porous perovskite MIEC having surface area s = 106 cm−1. When Lg Lp the rate-limiting step is mass transport in the pores and the enhancement in ion current is substantially reduced. 相似文献
975.
Based on theab initio calculation results, the hydrogen atom transfer has been investigated. In order to explain the experimental results, a new
mechanism is proposed, that is, hydrogen transfer occurs before but not after CI atom eliminates from aromatic ring. The calculation
result strongly supports this mechanism. 相似文献
976.
977.
LiNbO3电光偏转器的研究 总被引:8,自引:1,他引:7
从电光效应出发,对LiNbO3电光偏转器的基本品质因子进行研究,导出了偏转器的设计公式,用有限差分法计算了四柱面电极电光偏转器的电场分布,对不同结构参数,给出了梯度线性度和结构因子。 相似文献
978.
本文通过对新疆农业生产函数的分析。讨论了生产要素转移情况。得出:1 新疆的土地资源已经过度使用;2 劳动力资源潜力很大,其转移方向正从流向第三产业转向第二产业;3 新疆农业资金缺乏,部分农业资金被非农业侵占。 相似文献
979.
Based on one-center model, the effects of the doping amount and the degrees of reduction and oxidation on the dynamic range M, the response time and the photorefractive sensitivity in the crystal LiNbO3∶Fe are analyzed in detail. The principle of material optimization is discussed. The best crystal thickness (about 1.4~2.6 mm) for the maximum dynamic range M is calculated for the different doping amounts. The results show that the more the doping amount, the lighter the reduction of the crystal should be chosen, and that the heavier the reduction of the crystal, the less effect the doping amount has on the response time. The dynamic range M is in conflict with the response time. Due to the difficulty of processing crystals, the thickness is increased to 5 mm at the cost of decreasing the dynamic range M by 0.3~0.5. 相似文献
980.
报道了纤锌矿WZ(wurtzite)GaN(0001)表面的电子结构研究.采用全势线性缀加平面波方法计算得到了GaN分波态密度,与以前实验结果一致.讨论了Ga3d对GaN电子结构的影响.利用同步辐射角分辨光电子能谱技术研究了价带电子结构.通过改变光子能量的垂直出射谱勾画沿ΓA方向的体能带结构,与计算得到的能带结构符合得较好.根据沿ΓK和ΓM方向的非垂直出射谱,确定了两个表面态的能带色散
关键词:
GaN
角分辨光电发射
全势线性缀加平面波
电子结构 相似文献