基于时间序列模型分析的ADHD儿童听觉持续性注意研究

摘要：通过建立时间序列模型,对ADHD儿童与正常儿童的听觉持续性注意水平进行拟合,并分析2组被试间的差异,动态地观测ADHD儿童的注意缺陷水平,并实现对ADHD儿童注意水平的预测.被试选取ADHD儿童30名,正常儿童10名,对被试进行听觉持续性操作测试,对每个序列的平均正确率进行时间序列模型分析,比较2组被试间的差异.根据数据的特征选用Holt模型对ADHD儿童的持续性注意水平进行建模及拟合,而正常儿童组则选用简单模型（Simple）.与正常儿童相比,ADHD儿童存在显著的注意缺陷特征,持续性注意水平随时间变化表现出明显的下降趋势.     

引入激励机制的基础物理实验教学模式

根据基础物理实验教学的特点,论述了在实验预习、实验操作两阶段引入激励机制教学手法的必要性和重要性,并以迈克尔逊干涉仪实验为例,阐述了激励机制的具体实施方法。     

3版本高中化学(必修)教科书中实验安全教育内容统计分析与思考

实验安全教育是中学化学教学的重要内容.对3版本高中化学(必修)教科书中的实验安全隐患、实验室安全守则、实验安全知识和操作技能、实验安全标志、急救措施的数量和呈现方式等进行统计与分析,并对如何完善高中化学实验安全教育提出几点思考与建议.     

Cutoff characteristics of dielectric-filled circular holes embedded in dispersive plasmonic medium

The cutoff characteristics of dielectric-filled circular holes embedded in a dispersive plasmonic medium are investigated. Since two distinctive operating modes, surface plasmon polariton and circular waveguide modes, can exist in the slow and fast wave regions, respectively, the cutoff characteristics for each are separately investigated for linear and radial polarizations of the guided fields. As a result, the cutoff wavelengths for the linear and radial polarizations with very small subwavelength hole radii are found to be limited by the plasma resonance wavelength and plasma wavelength, which in turn are dependent and independent, respectively, of the dielectric constant of the dielectric filler material.     

一种自适应交叉率和变异率的薄膜遗传算法

在并行移民操作的基础上,根据多层膜系迭代群体中各膜系的适应值信息,对每个膜系采取恰当的、自动适应搜索进程的交叉率和变异率。这样既保护了优良薄膜的设计方案,又能够在适应值整体水平不断提高的设计组群中,持续地产生更优良的薄膜设计结构。对增透膜的设计结果表明,采用提出的自适应遗传算法减小了早熟,提高了算法快速搜索合格膜系结构的能力。     

基于图像分离块操作的快速模板匹配跟踪算法

传统的模板匹配跟踪算法存在运算量大和实时性差的缺陷,限制了它的应用范围。针对这一问题,在已有的基于位置预测相关跟踪算法的基础上,提出了利用图像分离块操作对相关跟踪算法进行改进,进一步减少相关跟踪算法的计算量,以满足系统的实时性要求。对改进算法进行了模拟仿真实验验证。仿真结果表明：该改进算法不仅在很大程度上减少了计算量,提高了跟踪系统的实时性,而且能够有效地减少随机噪声的影响,使得跟踪更加快速准确。     

New Two-Mode Coherent-Intermediate-Entangled State and Its Squeezing Operator

The coherent-intermediate-entangled state ｜α, x）λ,v is proposed in the two-mode Fock Space, which exhibits both the properties of the coherent and entangled states. The ｜α, x）λ,v makes up a new quantum mechanical representation, and the completeness relation of ｜α, x）λ,v is proved by virtue of the technique of integral within an ordered product of operators. The corresponding squeezing operators are derived. Furthermore, Generalized P-representation is constructed in the coherent-intermediate-entangled state ｜α, x）λ,v and the Schmidt decomposition of ｜α, x）λ,v is investigated.     

Realization of Tip Tilting By 8-Step Line Tilting

By direct calculation of rotation matrices of SO（3）, we show how certain specific sequence of eight consecutive rotations of digital angles can yield a tilting of a facet mirror. We also design a detailed program specifically to tilt an array of mirrors from planar orientation to the required focusing orientation. We describe how to use the 8-step to realize the focusing of the mirror array. We have found, in our designed program, an important feature of row-sharing during the rotations for the columns and similarly the column-sharing during the rotations for the row. This feature can save a lot of operating time during the actual realization of the mechanical movements.     

A Scheme for Atomic Entangled States and Quantum Gate Operations in Cavity QED

We propose a scheme for controllably entangling the ground states of five-state W-type atoms confined in a cavity and realizing swap gate and phase gate operations. In this scheme the cavity is only virtually excited and the atomic excited states are almost not occupied, so the produced entangled states and quantum logic operations are very robust against the cavity decay and atomic spontaneous emission.     

操作参数对PEM燃料电池中水迁移的影响

质子膜内水分和阴极多孔电极中液态水含量是PEM燃料电池正常运行的控制因素。本文给出了一个用于研究PEM燃料电池内水迁移的稳态、等温、两相流模型。模型耦合了连续方程、动量守恒方程和物质守恒方程,以及水在质子膜中传递方程。运用试验结果验证了模型的有效性。分析模拟结果表明,增大系统操作压力、升高电池操作温度和降低加湿温度将会使质子膜中水的净迁移通量增大;增大操作压力、降低操作温度和升高加湿温度会增加阴极CTL与GDL界面上液态水含量。