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In this paper, we propose a novel extending algorithm to design rate compatible (RC) QC-IRA-d codes through Tanner Graph extension. The structure of QC-IRA-d codes provides high efficiency and low complexity for graph extension. Thus, in the proposed method, there are three features: (1) close relation between the extended parts and original parity check matrix; (2) larger length of introduced cycles; (3) balanced check node degree. All of them guarantee good performance of the designed RC family codes. Simulation results show that the graph extension method outperforms existed algorithms from 0.05 to 0.47 dB for different rate codes.
相似文献2.
基于需求和生产成本偏差的Cournot竞争供应链协调 总被引:1,自引:0,他引:1
分析一个供应商和两个Cournot竞争零售商组成的供应链系统的协调问题.首先证明收益共享合约在稳定条件下能实现该供应链协调;当突发事件导致零售商面临的需求规模和供应商的生产成本同时与其预测值发生偏差时,为使供应链收益最大,提出了调整生产计划和零售价格的协调策略,进一步证明了改进的收益共享合约可协调需求和成本偏差的分权供应链;最后进行了数值实验. 相似文献
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采用高温固相法合成了Dy 3+、Eu 3+共掺杂Y3MgAl3SiO12石榴石型荧光粉。采用XRD、荧光光谱仪等仪器对样品的结构以及光谱特性进行表征,探究了Dy 3+/Eu 3+在Y3MgAl3SiO12基质结构中的光谱特征以及离子间的能量传递机制。在367 nm近紫外光激发下,Y3MgAl3SiO12:Dy 3+,Eu 3+的发射光谱包含Dy 3+的6F9/2到6H15/2和6H13/2的电子跃迁特征发射(487 nm蓝光和592 nm黄光)和Eu 3+的5D0 7F2 and 5D0 7F4特征发射峰(616 nm和710 nm红光)。在400~500 nm范围内Dy 3+发射谱与Eu 3+激发谱重叠,表明Dy 3+与Eu 3+之间存在着能量传递,能量传递的机理为电四极-电四极相互作用。该荧光粉通过调整Dy 3+和Eu 3+的掺杂浓度比封装近紫外LED芯片,可以实现单基质暖白光LED照明。 相似文献
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Yanhong Liu Yan Fu Jing Wang Bingchun Xue Erbao Liu 《Russian Journal of Physical Chemistry B, Focus on Physics》2017,11(5):722-728
The pKa values of some phthalhydrazide derivatives were calculated using ab initio and two density functional methods to obtain information about their reaction conditions. The results showed that pKa1 was influenced by structural modification as it varied between 0.47 and 6.99, and that pKa2 was relatively less variable from 16.66 to 21.53. The high values of pKa2 revealed that a strong alkaline solution was necessary for all chemiluminescent reactions of discussed phthalhydrazide derivatives. 相似文献
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针对移动机器人在大范围环境中的巡逻路径优化问题,提出一种基于RFID信息节点导引方法的路径和时间优化策略。研究了在一由实际环境抽象得出的拓扑地图环境下,使用RFID标签来标记环境中的关键位置,例如走廊,交叉点,拐角等,并且利用标签中储存的导航指令来指导移动机器人的行动。将机器人分为3路巡逻,优化得出巡逻总路程最短且历经信息节点数均衡的路径。设定机器人在节点的停留时间,研究了机器人在一限定时间内巡逻完所有节点的分组及路径优化方法。为大范围布置RFID信息节点导引机器人行动的环境下,提供了一种巡逻路径优化方案。 相似文献
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Efficient syntheses of 3,4-diarylsubstituted hexahydro-1H-indoles in good yields with excellent diastereoselectivities were achieved with a two-step protocol comprising an allylic cation mediated nucleophilic addition and an intramolecular cyclization reaction. The N-aryl sulfonyl protecting groups of cyclization products were readily removed to furnish free amines with retention of halogen substitutions and CC double bonds. 相似文献
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Determination of the effective components in traditional Chinese medicine is one of the key steps for its identification.
In this paper a novel and sensitive chemiluminescence (CL) method for the determination of rhein coupled with flow-injection
analysis (FIA) is developed. It is based on the strong sensitizing effect on the weak CL reaction between luminol and ferricyanide
in alkaline solution. Under optimal experimental conditions, the relative CL intensity is proportional to the concentration
of rhein in the range of 7.0 × 10−12–7.0 × 10−10 mol L−1 and 1.0 × 10−9–4.0 × 10−5 mol L−1, the detection limit is 1.478 × 10−13 mol L−1, and the relative standard deviation (RSD) for 9 parallel measurements of 1.408 × 10−7 mol L−1 rhein is 3.4%. The method was successfully applied to the determination of rhein in pharmaceutical preparations. The possible
mechanism of CL is also briefly discussed. 相似文献
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