Hartmann势Klein-Gordon方程的束缚态

用分离变量方法讨论了在Hartmann标量势和矢量势相等条件下Klein-Gordon方程的束缚态解.体系的性质与三个量子数及Hartmann势的势参数有关.给出了用广义连带勒让得多项式表示的归一化角向波函数和用合流超几何函数表示的归一化径向波函数,获得了精确的束缚态能谱方程.氢原子势是本文Hartmann势的特例.     

睡眠剥夺对脑认知和脑电复杂性的影响

为研究睡眠对大脑功能的影响，考察了正常睡眠与睡眠剥夺情况下脑认知能力的变化，分析了两种状态下自发脑电和事件相关电位复杂性的差异．通过事件相关电位P300的潜伏期与幅度反映不同状态下的脑认知能力，采用小波熵方法分析其复杂性．实验采用数字脑电图仪记录19导脑电信号，用OB序列诱发视觉事件相关电位．结果发现，睡眠剥夺组的靶刺激反应时间明显增长，而P300幅度显著降低、潜伏期明显增加；小波熵分析结果表明，与正常睡眠组比较，睡眠剥夺组自发脑电的256点小波熵和事件相关电位的32点小波熵均值都显著降低．故得出结论：睡眠剥夺对人的认知和脑电复杂性均产生了负向影响．因此，睡眠对维持大脑的功能具有重要作用．     

金属板与特异材料板间的Casimir力

研究金属板和特异材料间的Casimir力。金属板的电磁性质是由实验数据拟合得到,特异材料板的电磁性质则是用Drude-Lorentz模型来描述。通过改变两块材料板的相关参数,研究了Casimir吸引力、排斥力的变化及其相互转化。结果表明,随着两板间距的增加,两板间的Casimir力会经历引力-斥力-引力的转化。     

基态原子价电子平均能的估算及应用

本文提出了一个判断元素化学分性的能量标度，它对周期表中元素性质的递变给予了较为合理的解释，用值划分的化合的价键类型与实验数据相一致。     

电离势,电子亲和势,电负性与酸碱软硬度

本文用Lewis酸的平均电离势对其电负性作图;用Lewis碱的第一电子亲和势对其电负性作图,得出分类软酸、硬酸和软碱、硬碱的两个方程: H_A=∑I_n/n-3.1x 2.6 (1) H_B=A 3.51x-7.24 (2)运用(1)式计算了113种酸的硬度值,用(2)式计算了59种碱的硬度值。突破了复杂酸碱的标度问题。结果与Dearson根据实验所总结的分类一致,与Ahrland和Klopman结果相比较大致呈线性关系。     

＂Aha!＂ effects in a guessing Chinese logogriph task： An event-related potential study

In the present study, high-density event-related potentials （ERPs） were recorded to examine the electrophysiologic correlates of ＂Aha!＂ effects in a guessing Chinese Iogogriph task by using a two-stage model for learning-testing. Results showed that： Firstly Successful Guessing elicited a more negative ERP deflection （N350） than Recognition did in the time window from 300--350 ms after onset of the stimuli. A voltage map of the difference wave （Successful Guessing minus Recognition） showed strong activity at the front-central region. Dipole analysis localized the generator of the N350 in the vicinity of the posterior cingulate cortex （PCC） and the inferior frontal gyrus. Secondly, a greater late positive component （LPC） in Successful Guessing than Recognition was found between 600 and 700 ms post-stimulus. Dipole analysis localized the generator of LPC in the right parahippocampal gyrus.     

关于一类非多项式位势的Littlewood问题(英文)

本文证明了方程+x²ⁿ⁺¹+P_x（x,t）=0所有解的有界性,其中n≥1,P（x,t）是关于两个变量x与t都是光滑的1-周期函数.     

Collagen gels populated with rat neonatal heart cells can be used for optical recording of rhythmic contractions which also show ECG-like potentials

Neonatal heart cells populated collagen gels show rhythmic contractions which can be recorded optically and electrically. Optical recordings revealed two populations of rhythmically contracting gels: 1) highly coherent contracting collagen gels with normally distributed contraction interval times and contraction amplitudes, and 2) irregularly contracting gels with a multi-modal distribution of contraction interval times and amplitudes. The irregularly contracting gels were shown to be semi regular, which means that a short contraction interval was preferentially followed by another short interval. The volume of the collagen gel during the contraction decreased, and our calculations indicate that the myocytes expel 3–10 times their own volume from the gel. Changes in electrical potential were observed depending on the location of the electrodes. These electrical, ECG-like changes in potential were maximal when one electrode was placed in the centre and the other at the edge of the gel. The results of this study indicate that myocyte-populated collagen gels are a very promising system for studies of electrophysiology and coherent contractions.     

标识设计中语义认知事件相关电位

采用事件相关电位(ERP)技术,以公共空间标识为研究对象,探索图文语义一致或不一致对用户标识认知的影响.实验材料源于GB/T 10001《标志用公共信息图形符号》,采用Matlab13b和Stata14对脑电和行为数据进行处理.结果表明:在标识认知过程中,诱发了N170、P200、N300和N400,说明被试经历了分类处理、情绪唤醒、逻辑判断和语义判断4个阶段;图文语义是否匹配2种条件下所诱发的N300在前额区差异显著;N400在前额区、中央区和顶区差异显著.N300和N400可以作为判断标识图形与预期语义是否一致的神经测量指标.     

三维空间中近距离多天线信道的容量分析

针对多天线系统在近距离和远距离2种场景下信道矩阵的差异,基于球面波模型进行信道容量分析,并通过使用球面波模型（spherical wave model,SWM）,研究了三维空间中近距离多天线直线传播（line of sight,LOS）信道容量。相比现有基于信道测试和计算机仿真的研究方法,在三维空间中建模任意方向的线性天线阵列,给出球面波模型下的近距离LOS信道矩阵,在此基础上推导了近距离LOS信道容量的闭式解。通过信道容量的闭式解和计算机仿真分析了影响近距离LOS信道容量的参数,揭示了近距离LOS信道容量的本质特征。理论和分析结果表明,在三发三收近距离LOS信道中,信道容量是“类余弦”的函数,即具有类似余弦函数的周期振荡特性,其变化特征由波长、阵元间隔、收发通信距离和阵列方向完全决定,通过合理设计这些参数使近距离 LOS 信道容量达到最大。