Effect of doping on TSD relaxation in cellulose acetate films

Thermally stimulated depolarization current (TSDC) studies have been performed on solution grown cellulose acetate films doped with different concentrations of acrylic acid (AA) prepared at the poling temperatures (40–75°C) with poling fields (10–50 kV/cm). The TSDC spectra of pure and AA doped CA films reveal two relaxation peaks at 80°C and 180 ±2°C, having activation energies centred around 0.25 and 0.55 eV. The phenomena of the existence of these current maxima have been analyzed and discussed in terms of the molecular motion of the polar side groups and release of the remaining part of the frozen dipoles by their cooperative motion with adjoining segments of the main polymer chain. The peak currents, released charge and activation energies associated with the peaks are affected by AA doping. The effect of doping with acrylic acid on the discharge current indicates the formation of molecular aggregates     

风、光、柴电互补型通信基站塔桅结构的实践

将10kW级风力发电机安装在通信塔顶部,首次实现了通信塔与风力发电塔统一于一体,同时利用风能、太阳能为主要供给能源,利用柴油发电为辅助能源,有效地解决了边远地区通信基站供电问题,充分利用了清洁能源,节能环保.     

TSD型分解炉的研究开发及工程应用(上)

通过理论及试验研究,,开发了适用于无烟煤煅烧的TSD型分解炉,并结合工程实践应用,将TSD型分解炉成功应用于2500～5000t/d水泥熟料生产线,取得了成功。     

TSD在A320飞机燃油传感器故障诊断中的应用

结合某公司一架A320飞机燃油系统故障的排除过程,说明了将飞机本身的自测试（BITE）与集中故障显示系统（CFDS）有机结合对故障检测的重要意义：燃油量显示计算机和燃油油位感应控制组件的故障数据的相互对比,能较方便地发现故障线索。推荐了一种快速判断燃油系统传感器故障的方法,实际使用表明该方法准确而方便。     

一种自制聚酰亚胺膜与商品Kapton H膜的驻极体性能比较

通过和杜邦公司产KaptonH商品膜驻极体性能比较,系统研究了由国产ZPKI型聚酰亚胺前体溶液制备薄膜的驻极体性能。通过常温和高温正负电晕充电,补偿法表面电位衰减测量及开路热刺激放电（TSD）电流谱等技术,研究了常温和高温驻极时PI膜的电荷稳定性及其电荷输运特性,高温致密化处理对样品驻极体性能的影响,以及正负电晕充电稳定性的化学结构分析。     

Physical and chemical effects on the dynamics of the β-relaxation of PMMA in Rhodamine 6G+PMMA+SiO<Subscript>2</Subscript> matrices

The Thermally Stimulated Depolarization (TSD) Current technique has been used to reveal confinement effects on the β-relaxation process of PMMA polymerized in-situ SiO₂ in the presence of the laser dye Rhodamine 6G/Cl^– (Rh6G). The TSD current band of the β process, associated with the rotational relaxation of the mobile carboxymethyl side groups of PMMA, presents a drastic low temperature shift with the introduction of Rh6G or the confinement of PMMA in the nanometric silica substrate. By using the fractional polarization technique we have decomposed this band into single current signals. Irrespective of the initiator type used in the polymerization process, the broad activation energy distribution associated with the β process is nearly identical in the Rh6G+PMMA+SiO₂ materials and bulk PMMA. The increase of the dye concentration enlarges the band shift, without any significant modification in the TSD current spectrum (i.e. distinct bands from the polar chromophore). The changes in the molecular dynamics of the polar carboxymethyl side groups of PMMA are discussed in terms of the hydrogen-bond interactions between the silicic acid pore surface and the basic side-groups of PMMA and the decrease of the polymer chain entanglements due to pore directed propagation of polymerization. The relative importance of the various types of interactions between the two chemically identifiable phases in the presence of the dye is discussed. Electronic Publication     

斜拉弹簧质量阻尼器的风振控制机理

本文针对斜拉弹簧质量阻尼器（ＴＳＤ）对结构风振控制机理作了深入分析。文中指出ＴＳＤ实际上是一种非线性控制装置，并在豚动风模拟基础上，给出非线性ＴＳＤ作用下结构的受控反应的求解方法。另外在ＴＳＤ满足一定的构造条件下，可忽略ＴＳＤ的非线性，从而可用线性随机振动理论求解结构的受控反应，因此可大大简化ＴＳＤ的设计计算。上上两种分析方法均考虑了斜拉弹簧对结构风振控制的影响。     

基于MSER和SVM的快速交通标志检测

为解决传统的基于机器学习的交通标志检测(TSD) 方法需要对每一个待检测子窗口进行处理而导致算法实时性不高的问 题,提出了一种基于感兴趣区域(ROI)提取和机器学习的快速TSD 算法。针对传统基于颜色阈值的ROI提取方法具 有对光照变化较敏感等缺点,设计了一种颜色增强下的最大稳定极值区域(MSER)方法 ,根据标志的颜色进行 颜色增强,对颜色增强图像提取MSER得到交通标志ROI;然后在图像的多尺度滑动遍历检测 过程中,仅对包含ROI的滑 动窗口进行方向梯度直方图(HOG)特征的提取,并通过支持向量机(SVM)进 行分类判别。实验结果表明,本文改进的TSD方法在运算速度上有较大提升,具有很好的鲁 棒性,且获得了96.42%的检测率以及较低的误检数。     

阳坊站65m单管圆锥通信塔风振控制及其实测

通过在 65m高的北京移动GSM网工程阳坊基站圆锥形钢管通信塔上安置调频弹簧质量阻尼器(TSD) ,进行了风振控制研究。实测和分析结果表明 ,该减振装置对于单管圆锥塔结构来说是经济、实用的。     

圆锥钢塔调频弹簧质量阻尼器风振控制研究

针对调频弹簧质量阻尼器 (TSD)对单管圆锥钢塔风振控制的机理作了深入研究。使用通用有限元分析软件ANSYS ,结合具体工程对TSD的风振控制进行了动静力分析 ,分析了控制参数对控制效果的影响。研究表明 ,TSD可以有效地抑制单管圆锥钢塔的风振反应。