有限深对称量子阱中电子量子比特的性质

通过求解有限深对称量子阱中电子的能量本征方程,得到电子的能量状态;并以此为基础利用基态和第二激发态叠加构造一个量子比特,研究电子量子比特的性质.数值计算结果表明:概率密度的振荡周期与量子阱宽度和深度均有关,当势阱深度给定时,振荡周期随量子阱宽度的增大而增大,当阱宽给定时,振荡周期随势阱深度的增大而减小.各坐标点的概率密度幅值不同,量子阱中心位置概率密度幅值最大,其它位置较小.电子的概率密度以周期T在z方向振荡,不同时间点的概率密度幅值不同,在一个周期内,当t=0T,1T时电子概率密度在阱内中心达到最大,当t=0.5T时电子概率密度在阱内中心达到最小;在阱外电子的概率密度都是向两边逐渐衰减的.     

塑料动态挤出填充过程的数值模拟研究

利用ANSYS软件对受入口处周期性振动压力驱动的塑料熔体在"L"形异型材挤出口模内的填充过程进行了三维等温数值模拟。研究了流场压力和速度随入口压力振动的变化规律,分析了压力振动对塑料熔体流动稳定性的影响。结果表明:流场压力和速度都随入口压力的振动而振动,但振动强度随流程增加而减弱,只要选择适当的振动参数和口模长度,就可以使出口流场稳定,以保证塑料制件的质量。     

一类二阶强迫非线性FDE解的振动性和渐近性

利用振动性、渐近性理论和微分不等式,建立了一类偏差变元依赖状态的二阶强迫非线性泛函微分方程的振动准则,并举出例子来验证所得结果,讨论了有界振动解的渐近性。所得到的结果对相应的齐次方程仍然适用。     

一类二阶非线性泛函微分方程解的振动性

讨论了一类二阶非线性泛函微分方程(a(t)(y′(t)σ)′ q(t)f(y(τ(t)))g(y′(t))=0,t≥t0,σ是分母为奇数的有理分数时方程解的振动性．     

具连续变量差分方程振动性的某些新结果

本文建立了具有连续变量的变系数差分方程的所有解振动的新的充分条件，改进了最近文献中的一些结果。     

一类非线性时滞微分方程振动的充要条件

给出了非线性时滞微分方程dx/dt ∑ni=1fi(t,x(t-ti(tt))=振动的充要条件。     

具有偏差变元非线性偏微分方程解的振动性定理(Ⅱ)

研究了一类具有偏差变元的非线性偏微分方程解的振动性，得到了方程所有解振动的判别准则。     

基于呼伦贝尔煤电基地送出系统的SSDC设计与分析

由于呼伦贝尔煤电基地某电厂机组通过高压直流输电系统外送出系统,会引起发电机轴系的的次同步振荡风险,为了实现SSDC较好的抑制效果,设计了基于PLL次同步信号提取方法的宽带SSDC,并通过PSCAD/EMTDC电磁暂态仿真分析了SSDC的次同步振荡抑制效果.SSDC结构选择宽带SSDC结构,基于PLL提取HVDC整流侧交流母线电压信号中的次同步分量作为SSDC控制器的输入信号,采用频域校正法设计SSDC控制器传递函数,使其在幅频-相频特性上满足在较宽次同步频率范围内抑制次同步振荡的相应要求.     

Relationship between El Nino /South Oscillation (ENSO) and population outbreaks of some lemmings and voles in Europe

Ecologists have been puzzled by population cycles of lemmings and voles for the over 70 years. At present, our understanding and explanation to this phenomenon remain controversial. Recently, El Ni?o/South Oscillation has attracted attention of ecologists on its links with population outbreaks of terrestrial animals. This paper aims to investigate the statistical relationship between outbreaks of microtine rodents and ENSO events by scanning available literature. During 1862—1894, outbreaks of Norway lemmings in Norway tended to occur in the Southern Oscillation Index (SOI) peak years or 1 year after the SOI peak years with an approximate significance level ( p = 0.057). During 1885—1931, outbreaks of voles in France tended to occur 1 year before the SOI peak years (p = 0.01). During 1946—1993, outbreaks of lemmings and voles in North Finland tended to occur 1 year before the SOI peak years with a significant level (p = 0.022); the peaks of population abundance corresponded well to the SOI trough years (equal to 1 year before the SOI peak years). Outbreaks of common voles in Poland during 1946—1975 tended to occur in the SOI peak years or 1 year before the SOI peak years (p = 0.011), and also tended to occur 1 year before the SOI peak years (p = 0.030). It was also found that the rodent outbreaks in Norway and France, rodent outbreaks in Finland and Poland synchronized well. It was suggested that the ENSO-related climate or food were key factors in causing outbreaks of microtine rodents in Europe.     

济钢热轧厂风机监测系统的设计方案

根据主电机冷却风机的设备情况,提出了风机温度和振动在线监测系统的设计方案。