改进的构造函数盲均衡算法研究

以提高通信信号质量和降低其受多径效应的影响为背景,介绍了恒模算法(CMA)及构造函数算法(CF算法),并在此基础上针对其不足作了相应的改进,提出分数间隔修正构造函数盲均衡算法(FSE-MCF)。对改进算法的均衡性能进行了仿真,仿真结果分析可知,新算法与CF算法相比较,在相同信噪比条件下可以进一步减小稳态误差,加快收敛速度,有较好的均衡性能。     

Manufacturing of CdTe thin film photovoltaic modules

The technology to fabricate CdTe/CdS thin film solar cells can be considered mature for a large-scale production of CdTe-based modules. Several reasons contribute to demonstrate this assertion: a stable efficiency of 16.5% has been demonstrated for 1 cm² laboratory cell and it is expected that an efficiency of 12% can be obtained for 0.6 × 1.2 m² modules; low cost soda lime float glass can be used as a substrate; the amount of source material is at least 100 times less than that used for single crystal modules and is a negligible part of the overall cost. The fabrication process can be completely automated and a production yield of one module every 2 min can be obtained, which implies a production cost substantially less than 1€/W_P. A further cost reduction will render this kind of energy production competitive with the energy obtained from fossil fuels by approaching the so-called grid-parity. Some new companies have recently announced the start of production or plan to do so in the near future. Many of these plants are located in Germany, some in the USA. In Italy, a new company has been constituted in 2008, with the aim of building a factory with a capacity of 18 MW/year. In this article, we will describe and compare the basic principles of CdTe solar cells and modules. We will include an overview of the potentials of these technologies and of the R&D issues under investigation. This paper describes how the large-area mass production of CdTe solar modules is realized in the Italian factory and presents a worldwide overview of the current production activities.     

一种非均匀采样重构芯片热信号的方法

实时片上热信号是集成电路芯片动态热管理(DTM)的重要信息。提出了一种基于Voronoi图的非均匀采样重构芯片热信号的方法,该方法在16核的处理器上每核9个传感器的情况下给出了最小2.25%的平均误差,并且通过与距离倒数加权平均法的平均运行时间的对比验证了该种方法的优越性。     

密集模态的判断准则

用特征向量转角给出了一种密集模态的判别准则。算例表明本文方法有效     

基于输出解相关的分数间隔直接盲均衡算法

提出一种基于输出解相关的分数间隔直接盲均衡算法.该算法基于过采样接收信号或多传感器接收信号产生的分数间隔单输入多输出线性信道模型,利用均衡器输出的解相关特性和二阶统计量来直接估计均衡器,不需要预先估计信道冲激响应,可直接估计任意延迟的均衡器系数.该算法与传统的基于二阶矩的两步均衡算法相比,计算简单,精度高.仿真结果表明,该算法具有很好的均衡效果.     

基于虚拟孔底距的孔口预留最大不装药长度的确定及应用

某黄金矿山采用上向扇形中深孔爆破落矿时存在粉矿过多,眉线口及后排炮孔破坏严重等问题.通过理论分析和现场实践,提出了采用虚拟孔底距确定孔口预留最大不装药长度的方法,设计了2种预留长度的孔口间隔装药方案,并进行了现场工业试验.工业试验结果表明:采用孔口间隔装药方案二能够很好地解决现场爆破出现的问题,降低了孔口起爆药量,减轻...     

泛滥平原沉积物的超低密度采样代表性研究(二):统计学检验及地质意义

设计了１个采样点／１ｋｍ２、１个组合样／４ｋｍ２，１个采样点／１００～１０００ｋｍ２和１个采样点／１０００～１００００ｋｍ２３个层次的采样密度，系统研究了泛滥平原沉积物的超低密度采样代表性。运用统计学原理对泛滥平原沉积物中３０～４０余种元素进行正态母体显著性检验、ｔ检验及对多元素总体的灰关联分析，表明用１个采样点／１０００～１００００ｋｍ２的采样密度采集的泛滥平原沉积物具有代表性。因此建议在国际地球化学填图中用泛滥平原沉积物作为全球超低密度地球化学填图的采样介质。     

Metacognitive control over the distribution of practice: When is spacing preferred?

The authors clarify the source of a conflict between previous findings related to metacognitive control over the distribution of practice. In a study by L. Son (2004), learners were initially presented pairs of Graduate Record Examination (GRE) vocabulary words and their common synonyms for 1 s, after which they chose to study the pair again immediately (massed practice), later (spaced practice), or not at all (done). Learners chose spaced practice less as pair difficulty increased. A. S. Benjamin and R. D. Bird (2006), using different materials and procedures and a longer presentation duration (5 s), concluded just the opposite. The authors adopted Son’s materials and procedures and replicated her findings with a 1-s stimulus duration. However, the declining choice of spacing as item difficulty increased largely reflected learners’ failure to fully perceive items with brief presentations. With longer presentations, ensuring full perception, the choice of spaced practice increased with greater pair difficulty, in agreement with Benjamin and Bird. Theoretical implications are discussed in the context of discrepancy-reduction and proximal-learning perspectives. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于编码理论的非等间距天线阵设计

确定设计低副辨电平非等间距天线阵和设计具有紧养伤谱特性的编码序列之间的关系。研究以编码理论为基础的非等间距天线设计方法,并给出设计非等间距阵阵的实例。     

基于粒子群算法的非均匀稀布阵列综合

给出了一种基于粒子群算法的非均匀稀布阵列综合方法,设计有最小阵元间距约束的稀布阵,通过加入间距约束向量改进了适应度算法,不仅减小了布阵空间,而且消除了优化过程中的不合格个体。在给定阵列孔径和阵元数的条件下,实现了最小阵元间距约束下抑制栅瓣,降低旁瓣电平的阵列综合。通过仿真实例,验证了此方法的高效可行性。