非平稳信号的双重中值容错平滑算法

平滑是消除或削弱测量数据随机误差时常用的数据处理手段。文章建立了一组新的非平稳数据序列容错平滑算法，其采用两阶段两次滑动中值与滑动均值平滑组合，实现了数据简化与平滑的统一。理论分析和仿真计算结果证实，算法可有效避免斑点型异常数据的不利影响，有效削弱随机误差的影响，改进数据处理精度和数据处理结果可靠性。     

双三角翼外翼前缘钝化对涡流特性的影响

通过风洞试验，利用７孔探头对７５°／４５°和７５°／６０°两种典型双三角翼进行了空间流场测量，研究了双三角翼前缘形状对大迎角涡流特性的影响．试验结果表明，双三角翼外翼前缘钝化使双涡态的双三角翼内、外翼涡互相靠拢、增加干扰，当出现合并涡态时，使合并涡涡核向内下方偏移；外翼前缘钝化使外翼涡或合并涡的Ｃｐ０、Ｖｘ较尖前缘时为高，最终使外翼涡或合并涡推迟破裂．     

一般硬化材料弹塑性旋转盘的变分解法

首先在小弹塑性范围内用应变的奇次四项式相当精确地拟合一般硬化材料的拉伸曲线;再在体积不变条件下用弹性位移场的已知模态和一待定幅值构成弹塑性位移场;最后用势能原理确定该幅值而得到封闭解。     

人工释能法求解线性代数方程组

本文建立求解线性代数方程组的人工释能法迭代格式,并给出该迭代格式收敛的充分必要条件和最佳释能时机,同时给出实现人工释能法的数值计算方法及其数值稳定性条件。     

半浮区液桥自由面振荡特征

使用一套双路同步显微放大录像及图像处理系统,研究了夹角为90°的两个竖直剖面沿轴向不同高度液桥自由表面的位移振荡,得到轴向不同高度上的环向相位差,观测到在振荡周期内液桥表面轮廓线在不同时刻均不相交的特点。实验结果表明,液桥自由面振荡除具有径向扰动及轴向振荡变化外,还存在环向波动变化。根据实验结果,讨论了环向波动基本变化规律以及本实验在测量精度和测量误差方面存在的问题。     

测量结果的不确定度

不确定度是测量质量的重要指标。根据测量分布,提出了两类不确定度的评定方法,阐明了合成不确定度与总不确定度的计算和性质,并举出了应用例子。     

碱性体系锌—镍合金电沉积的研究

本文介绍了一种新型的碱性体系锌-镍合金电镀工艺。本工艺镀层光亮、镀液稳定、组成简单及维护方便,能在很宽的工艺范围下能镀出含镍量为11～15％的锌-镍合金。镀层具有高耐蚀性及低氢脆性。对电沉积机理也作了必要叙述。     

复杂测量系统中时间的系统误差测量方法

长距离的复杂测量系统中,由于传输通道不同,引入的传输延迟时间变化不同,导致原有时间关系的误差引入。介绍了几种可行的系统误差测量方法,以消除系统误差对信号间时间关系的影响,同时达到检验测试系统安排是否存在问题的目的。     

Acceleration of interplanetary pick-up ions and anomalous cosmic rays

It may not be doubted anymore that anomalous cosmic rays (ACRs) are produced in the heliosphere from interplanetary pick-up ions through their acceleration at the solar wind termination shock. However, there is no general agreement in the community of heliospheric researchers concerning the mechanism of injection of the pick-up ions into the shock acceleration. We discuss here three possible ways for pick-up ions to be involved into the acceleration process at the termination shock: (1) preacceleration of pick-up ions in the whole region from the Sun up to the termination shock by solar wind turbulences and interplanetary shock waves, (2) local preacceleration of pick-up ions in a vicinity of the termination shock by shock surfing, and (3) formation of high-velocity tails in pick-up ion spectra consisting of secondary pick-up ions which are produced in the supersonic solar wind due to ionization of energetic neutral atoms entering from the inner heliosheath.     

A survey of radio jets with Chandra and HST

Relativistic jets are a common property of radio-loud Active Galactic Nuclei (AGN). Understanding jet physical properties is an essential precursor to understanding the mechanisms of energy transport, and ultimately, how energy is extracted from the central black hole. In this paper, I highlight recent developments from Chandra and HST observations of kpc-scale jets in AGN, with particular emphasis on our survey of 17 radio jets in a sample of FRII radio galaxies. These observations show that (1) X-ray and optical emission is common from kpc-scale jets, (2) a large fraction of the bolometric luminosity is emitted at X-rays, and (3) in most sources, a candidate emission process for the X-rays is inverse Compton scattering of the Cosmic Microwave Background off the relativistic electrons in the jet. If the latter scenario holds, the implication is that jets are still relativistic on kpc scales.