期指杀跌利空未尽

中看不中用的反弹在CPI猛虎周末或下山的威胁下草草收场,底在眼下还是在未来,"危机"中能否寻找"战机",请看下文——主持人期指杀跌利空未尽主持人:上周指出A股转入区间振荡,本周走势大致如此。下周是否延续这个趋势?硅谷子:在外围市场持续下跌、国际板扩容、加息等政策紧缩压力下,大盘自周四开始大幅回落并探至中期趋势     

SAW谐振器在发射机中的稳频应用

本文针对振荡电路中LC振荡的不稳定性．提出了使用SAW器件稳频技术，介绍了SAW器件的特点在SAW谐振器件发射机中的稳频原理。     

四端量子波导中电子的输运几率

量子波导理论研究不仅是对基础物理而且对量子器件研究具有重要意义,我们采用模匹配方法,研究了非均匀磁场下开放的四端量子波导中的电子输运性质。结果表明,从一端入射的电子可以透射到两个与之垂直的输出端和一个与之平行的输出端。在没有外加磁场的情况下,两个垂直输出端的输运几率是相同的,但垂直端与水平端的输运几率不同;在外加磁场下,由于磁边缘态效应,两个垂直输出的输运几率也有着相当大的差别。     

A new electrochemical oscillatory system of bromate in alkaline solution

A new electrochemical oscillatory system of bromate in alkaline solution is reported.In Pt-Bromate-Alkaline solution system,two different types of electrochemical oscillations(Type Ⅰ and Type Ⅱ) can be observed.Type Ⅰ appears before hydrogen evolution and Type Ⅱ involves periodic hydrogen evolution.Type Ⅰ relates to the adsorption/desorption of the hydrogen on platinum electrode,and Type Ⅱ with periodic oscillation stems from the coupling of electrochemical reactions(the reduction of bromate and evolution hydrogen reaction) with mass transfer(diffusion and convection).More over,under the right conditions,the two types appear in different oscillatory modes,for example,simple periodical mode and mixed one,etc..Crossed cycle in the cyclic voltammograms,which is the basic characteristics for electrochemical oscillatory systems,has also been observed as expected.     

振荡磁场量子点中自旋流的交流响应

We investigate alternating response of the spin current in a quantum dot system coupled to a normal metal electrode,to which an alternating driving voltage and a pumping rotating magnetic field are applied.The expression of the time-averaged spin current and its differential is obtained based on a non-equilibrium Green's function method.We find that for a given rotating frequency,the spin current increases rapidly and appears to have small steps when the driven frequency increases.As the driven frequency is further increasing,the spin current can be significantly enhanced and approaches a stable value.The photon-assisted processes bring about interesting features of spin current.The influence of the gate voltage and temperature on the spin current is examined in detail.     

大型机械抛石排在根石加固及防汛抢险中的应用

大型机械抛石排的研制：机械抛石排是孟州河务局针对小浪底水利枢纽投入运用后清水下泄后，孟州河段河床下切，根石下蛰，出险几率增多，抢险和根石加固工程量大，劳动强度高等问题而研制出的具有滑、抛两种功能的防汛抢险新机械。     

非线性控制系统运动的实验设计

自动控制原理课程中非线性部分内容繁杂不易理解,为加深理解该部分内容,通过模拟电子电路设计了非线性系统运动的实验,并通过系统参数的简单调整,使非线性系统运动的各种状态均能体现出来。通过该实验,能很好的实现理论与实践的完美结合。     

N维中心势原点处几率分布矩、波函数及其导数

本文先导出N维空间具有中心势的广义位力定理，然后利用位力关系，求出N维库仑势和各向同性谐振子势原点处的各种空间矩的几率分布，波函数及其导数。     

球型量子点结构中电子的共振隧穿

在有效质量近似和绝热近似的框架下,应用传递矩阵理论研究了球型量子点中电子的共振隧穿.结果表明:同一球型量子点中有效势垒宽度的增大使共振峰加宽,峰谷比减小;共振峰的位置由束缚能级决定,球型量子点半径越小,束缚能级越高,对应小尺寸的球型量子点要在较高能量处发生共振隧穿.这些可以为设计和制造更加优化的共振隧穿器件提供一定的理论指导.     

电化学振荡研究概述

概述了电化学振荡体系、实验研究方法、分类、实验判据及其应用和前景。