n—型聚乙炔复合膜电极性能的研究

自MacDiarmid等将聚乙炔(PA)做为二次电池的电极材料以来,其电化学特性和行为引起了人们的极大兴趣.随后的研究表明,p-型PA[(CH)~(y )Ay~-]_x在电解液中不稳定,用ClO_4~-掺杂的PA充放循环时有降解发生.n-型PA[My~ (CH)~(y-)]_x(y≤0.10)在THF/LiClO_4电解质中较稳定,电化学还原完全可逆,目前已实现1100次充放循环.因此,它既可做电池的正极材料(碱金属为负极),又可做负极材料(TiS_2为正极).我们发现     

Oscillatory disturbance in force calibration of optical tweezers

In the calibration of the optical trap stiffness, it is found that there appears an attenuating oscillation as an oscillatory disturbance added to the trapped bead movement, when the scanner is driven by a triangular wave input.An equivalent oscillator model is put forward to explain the mechanism of the oscillatory disturbance. Both the measurements and calculations show that the attenuating oscillation comes from the oscillation of the scanner and the triangular wave drive causes this additional oscillation of the scanner. Furthermore, the analysis indicates that the oscillatory disturbance will become stronger, when the stiffness of the trap increases or the natural frequency of the scanner decreases. We adopt another driving way, i.e. a sinusoidal wave input is used instead of the triangular wave input. Our experiment has verified that in this case the oscillatory disturbance is eliminated completely.     

Application of step-scan FTIR to the research of quantum cascade lasers

Fourier transform infrared (FTIR) spectroscopy has moreadvantages over many other techniques for high resolu-tion studies in the mid-infrared and far-infrared spectralranges. In addition to the high frequency resolution, itexhibits a high signal-to-noise ratio (SNR), high through-put, and broad band range. There are two ways forthe spectrometer to implement the scan process, i.e.,the rapid-scan (continuous-scan) mode and the step-scan mode. Although many relatively simple rapid-scanFTIRs h…     

“恒成立”问题的一种错解分析

本刊2002年22期《再解“恒成立”问题》一文介绍了以下一种求解“恒成立问题”的方法,笔者认为存在逻辑推理方面的错误。为了便于说明,将原文中的解法摘录如下。     

诸葛亮巧借东风—浅析伽利略航天轨道计划中的引力助推效应

本文扼要介绍了伽利略航天轨道计划，并以浅显的力学原理计算出伽利略探测器从地球飞向木星所需的初始速度。文中详细分析了伽利略探测器两次近飞地球的过程，揭示了引力助推效应在星际飞行中节省能量和控制航向的重大意义。     

椭圆可“展开”成余弦曲线吗?

先看以下一个问题: 题目高为2m,底面半径为r的圆柱,被一个平面截成形状相同的两个几何体(如图1所示),现将实体部分(下半部分)的侧面沿母线AB剪开,则这侧面展开图是( ).     

含压电片梁的静变形控制

首先借助阶梯函数，建立了含有任意分布的用作执行器的压电片的梁挠曲轴线方程。然后利用该方程，进行了梁的静变形控制的研究。最后结合实例，用“遗传＋配点”法对压电片的位置和尺寸进行了优化。结果表明，本文建立的挠曲方程形式简洁，求解简单：“遗传＋配点”法优化效果明显。     

非腔长匹配相干叠加脉冲锁模激光器的理论研究

提出了一个新的非腔长匹配相干叠加脉冲锁模激光器的物理模型,建立了它的数学方程,并进行了模拟计算.计算结果给出了各个参数对相干叠加脉冲锁模激光器运转的影响,以及脉冲宽度压缩速度和各参数之间的关系,获得了实现非腔长匹配相干叠加脉冲锁模激光器运转的最佳条件.     

二项式定理

二项式定理２１４０００江苏无锡市丁蜀高级中学路雪强，唐志华我们知道（ａ＋ｂ）１＝ａ＋ｂ　（ａ＋ｂ）２＝ａ２＋２ａｂ＋ｂ２（ａ＋ｂ）３＝ａ２＋３ａ２ｂ＋３ａｂ２＋ｂ３那么怎样展开（ａ＋ｂ）４？（ａ＋ｂ）２０？一般地又怎样展开（ａ＋ｂ）呢？先看（ａ＋ｂ）...