Output Characteristics of Photoelectric Slip Sensor Based on Micro-vibration Detection

In order to achieve the manipulator＇s soft grasp function, the key is to have slip sensors with fine performance. Depending on the elastomer and photoelectric elements installed in the hand, the sensor transforms the slippage between the grasped object and the robot＇s hand to electric signal, thus the slippage can be detected. It will cause elastomers＇ micro-vibration when the object is slippage. Based on the vibration theory, dynamic theory, light intensity theory and elastic deformation theory, derived is the conclusion that the object＇s slippage acceleration relativing to the robot＇s hand has linear relationship with the photoelectric elements＇ output voltage＇s differential, and then the model for slippage distinguishing is set up.     

DC-AC驱动下耦合双量子点分子中激子的动力学行为

利用两点Hubburd模型和Floquet理论,用数值方法求解了含时Sch(o)dinger方程,给出了电子-空穴局域于初始态的几率在20个驱动周期内的最小值,研究了在直流和交流电场驱动下耦合双量子点分子中激子的动力学行为.结果表明,在弱场情况下,激子主要在局域态之间隧穿;在强场情况下,电子和空穴可以独立地在量子点间隧穿.驱动场倾向于使电子和空穴在空间分离,但在合适的条件下量子点中的电子和空穴在短时间内仍可以保持在初始局域态.直流电压破坏系统的动力学对称性,并对动态局域化产生影响.     

消逝波激励及增益耦合的柱形微腔回音廊模激光辐射

毛细管的折射率比溶液的折射率高,石英毛细管在被插入的溶液中形成圆柱形微腔。采用近轴向消逝波抽运的方法,使激光的染料增益局限于抽运光在染料区的消逝场范围内,极大地提高了消逝波耦合柱形微腔的抽运效率。与侧向抽运方式比较,柱形微腔回音廊模(WGM)激光的抽运阈值从200μJ降低到9.5μJ。实验所得到的激光谱线波长以及相邻谱线的波数间隔与回音廊模式的理论计算吻合,说明石英毛细管能得到与石英光纤类似的柱形微腔回音廊模激光辐射。     

CDMA系统中半盲恒模算法的性能分析

本文对应用于CDMA上行链路多用户检测中半盲恒模算法的收敛性能、SIR性能和复杂度进行了深入研究。我们在无噪环境下分析了半盲恒模算法全局收敛的条件;通过算法SIR性能的分析,可知半盲算法可以获得更加优良的抵消MAI的能力;通过半盲恒模算法、盲恒模算法、解相关算法的复杂度比较,可知半盲恒模算法以略高于解相关算法复杂度的代价获得优于解相关算法和恒模算法的SIR性能和BER性能。     

一种并行的软判决引导常数模盲均衡算法

介绍了一种常数模与软判决引导结合的盲均衡算法CMA SDD。该算法克服了CMA收敛速度慢、稳态误差大的缺点,同时可以纠正相位偏转。仿真表明,在高信噪比(SNR)条件下,两种算法的稳态均方误差相近,而CMA SDD算法的收敛速度更快;在低信噪比条件下,CMA SDD算法可以获得更快的收敛速度和更低的稳态均方误差。     

Madsen求阶算法的改进和推广

文章分析了仅适用于特征为2和3的域上的一种椭圆曲线求阶算法—Madsen求阶算法,并对此算法进行了改进和推广,提高了Madsen算法的运算速度。     

一维光子晶体缺陷模局域场强的分布特征

用特征矩阵法研究不同结构缺陷光子晶体内部局域态场强的大小和分布特征.一维光子晶体缺陷模局域场一般以驻波的形式存在于缺陷内, 局域平均场强的大小与光子晶体构形、缺陷的结构参数、周期数密切相关.在同样条件下, 当缺陷模频率使光子晶体满足布拉格反射条件时, 缺陷模局域场的强度达到最大值.结构参数相同时, 缺陷模局域平均场强随周期数按e指数增加.研究结果对优化光子晶体的设计具有一定的参考作用.     

双光纤布拉格光栅波长锁定器的设计与制备

运用耦合模理论推导了双光纤布拉格光栅的透射率和反射率的解析表达式,利用相关表达式计算和分析了双光纤布拉格光栅的反射特性,并与单光纤布拉格光栅作了比较.讨论了双光纤布拉格光栅反射特性与光栅间距、光栅长度和折射率微扰最大值之间的关系,为双光纤布拉格光栅波长锁定器的设计与制备提供了理论依据.最终获得双光纤布拉格光栅的结构和特性参数,并与实测的数据进行比较,结果表明两者较为一致.     

一种基于音频应用的∑△power DAC研究和实现

介绍了一种应用在音频系统的∑△power DAC。对整个∑△power DAC的设计进行了详细的介绍，实际的硬件用Synopsys工具进行了完整的电路设计、仿真和版图设计。在MP3中得到实际应用，音质效果良好。     

Orientation and Structure of Ionic Liquid Cation at Air/[bmim][BF4] Aqueous Solution Interface

The watermiscible room temperature ionic liquid 1butyl3methylimidazolium tetrafluorob orate （[bmim] [BF4]） is a model system for studying the interactions between ionic liquid and water molecules. In this work the orientational structure of the low concentrated aqueous solution of [bmim] [BF4] at the air/liquid interface was investigated by sum frequency gener ation vibrational spectroscopy. It has been found that at very low concentrations, the butyl chain exhibited a significant gauche defect, indicating a disordered conformation; and the cation ring oriented with a fairly small tilting angle at the surface. When the concentration increased, the cation ring tended to lie flat at the surface, and the gauche defects of the butyl chain decreased due to the intermolecular chainchain interactions and the consequent more ordered interfacial molecular arrangement. Additionally, the antisymmetric stretching mode in the PPP and SPS spectra exhibited a peak shift, showing that there exists more than one kind of orientation or chemical environment for the butyl CH3 group. These results may shed new light on understanding the surface behavior of watermiscible ionic liquids as well as the imidazolium based surfactants.