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Plasma assisted molecular beam epitaxial growth of GaN with low growth rates and their properties 下载免费PDF全文
A systematic investigation on PA-MBE grown GaN with low growth rates(less than 0.2μm/h)has been conducted in a wide growth temperature range,in order to guide future growth of sophisticated fine structures for quantum device applications.Similar to usual growths with higher growth rates,three growth regions have been revealed,namely,Ga droplets,slightly Ga-rich and N-rich 3D growth regions.The slightly Ga-rich region is preferred,in which GaN epilayers demonstrate optimal crystalline quality,which has been demonstrated by streaky RHEED patterns,atomic smooth surface morphology,and very low defect related yellow and blue luminescence bands.The growth temperature is a critical parameter to obtain high quality materials and the optimal growth temperature window(~700-760℃)has been identified.The growth rate shows a strong dependence on growth temperatures in the optimal temperature window,and attention must be paid when growing fine structures at a low growth rate.Mg and Si doped GaN were also studied,and both p-and n-type materials were obtained. 相似文献
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Twin-Field Quantum Key Distribution Protocol Based on Wavelength-Division-Multiplexing Technology 下载免费PDF全文
Quantum key distribution(QKD) generates information-theoretical secret keys between two parties based on the physical laws of quantum mechanics. Following the advancement in quantum communication networks, it becomes feasible and economical to combine QKD with classical optical communication through the same fiber using dense wavelength division multiplexing(DWDM) technology. This study proposes a detailed scheme of TF-QKD protocol with DWDM technology and analyzes its performance, considering t... 相似文献
84.
基于2010年春季(5月)、夏季(8月)、秋季(11月)和2011年冬季(2月)对岱衢洋海域进行的4个航次网采浮游植物的调查资料,对该海域浮游植物的种类组成、优势种、细胞丰度分布以及生物指数与环境因子的相关性进行调查研究,并用富营养化指数、水质综合指数、浮游植物多样性指数进行水质状况评价.经初步分析,共鉴定出浮游植物50属116种,其中硅藻门37属92种,甲藻门10属20种,绿藻门和蓝藻门各2种.全年浮游植物优势种主要为硅藻门的琼氏圆筛藻(Coscinodiscus jonesianus)、星脐圆筛藻(Coscinodiscus asteromphalus)和中肋骨条藻(Skeletonema costatum).浮游植物种类数呈现由近岸向远岸递减的趋势,季节差异极显著(p=0.008<0.01),春季最少(33种),冬季最多(71种).浮游植物细胞丰度呈北高南低的趋势.夏季浮游植物细胞丰度最高,达67.66×106 cells·m-3,春季最低,为0.12×106 cells·m-3,两季节差异极显著(p=0.003<0.01).夏季靠近衢山岛一侧的D03和D05站位,尖刺拟菱形藻(Pseudo-nitzschia pungens)大量增殖,但未达到赤潮水平.冬季岱衢洋海域的浮游植物多样性指数最高,物种较丰富.春季均匀度指数最高,多样性指数也较高,但丰富度指数最低.相关性分析表明,浮游植物群落分布与水温、盐度、透明度、叶绿素a及营养盐等环境因子存在一定的相关性.富营养化指数表明,整个海域夏冬季多数站位均未发生富营养化,春秋季均处于富营养化状态,且春季富营养化最严重,多数站位处于中度富营养化状态.水质综合指数表明,整个海域处于轻污染状态,且夏冬秋季水质明显优于春季.浮游植物多样性指数表明,该海域除秋季处于重中度污染状态外,其他季节均处于轻中度污染状态. 相似文献
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In this paper,argon arc plasma is chosen as an example to study the absorption characteristics of arc plasma in the infrared region.Firstly,the phase and the attenuation constants are deduced for the given temperature,pressure and probe wavelength regions.Based on those constants,the dependence of the attenuation constant on the temperature and pressure in the vicinity of a certain probe wavelength is found.Then,theoretical analysis and discussion are conducted.Maximal absorption occurs at the position where the contributions of neutral particles and electrons come to a balance in a physical point of view,which may provide some measures to take for decreasing or controlling the plasma absorption of electromagnetic waves. 相似文献
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<正>A new method for simultaneously determining the size and refractive index of epithelial cell nuclei is presented.The function of the modified elastic light scattering spectrum is regarded as a function of wave number factor,Q=2λ~(-1)sin(θ/2).The modified spectrum has a constant oscillation period with its frequency proportional to the average diameter of cell nuclei.To the same average diameter,the different relative refractive indexes of epithelial cell nuclei only induce the horizontal shift of the spectra.Both the oscillation frequency and the horizontal shift are quantified by the fast Fourier transform on the modified spectra.The average diameter can be figured out through the peak frequency divided by the value of the refractive index of the surrounding medium.The phase angle of the peak frequency has an approximate linear relationship with the relative refractive index of epithelial cell nuclei. 相似文献
88.
以泡沫镍为催化剂,在600和700℃下,以CVD法热解乙炔气体制备大量的纳米碳纤维.随着制备温度增加,纳米碳纤维直径变小,竹节状含量减少, d002值减小,微晶片层平面Lc和La值增大,碳材料的可逆容量则下降.分别用透射电镜、 X射线衍射和拉曼光谱观察和测定了纳米碳纤维的形貌、微结构,发现在不同条件下生长的纳米碳纤维有不同的形貌和结构.对纳米碳纤维的电化学嵌锂性能的研究表明,纳米碳纤维的结构对其电化学嵌锂容量和充放电循环寿命起重要影响,制备温度越低,纳米碳纤维的石墨化程度越差,可逆嵌锂容量相应要高一些. 相似文献
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