Dynamic coloration of polymerized cholesteric liquid crystal networks by infiltrating organic compounds

We demonstrate the dynamic coloration of polymerized cholesteric liquid crystal(PCLC) networks templated by the“wash-out/refill” method in the presence of organic compounds. The reflection colors were modulated by two key approaches, that is, the injection of mutually soluble organic fluids into a microfluidic channel and the diffusion of volatile organic compounds(VOCs). The reversible tuning of reflected colors with central wavelengths between ～450 nm and ～600 nm was achieved by alternative in...     

ICP-OES内标法测定地质勘查石膏样品中氧化钙和三氧化硫

采用电感耦合等离子体发射光谱法测定地质勘查石膏样品中氧化钙和三氧化硫,样品经2 mol/L盐酸溶解,以钇元素作为内标物在线加入。用国家一级标准物质对精密度及准确度进行验证,6次测定相对标准偏差为0.16%～0.34%;相对误差为-0.50%～0.20%;与化学分析方法结果对照,相对偏差为-0.42%～0.38%,满足DZ/T0130.3-2006对准确度及精密度的要求。     

双向滤波法去除瞬态诱发耳声发射检测中的刺激伪迹

在瞬态诱发耳声发射信号检测中,去除刺激伪迹最传统的方法是“引出的非线性响应”法。但因其赖以成立的假设条件无法精确成立,会造成明显刺激伪迹残留,限制了对与刺激伪迹有重叠的短潜伏期高频耳蜗响应的检测。窗函数法和小波变换方法可在一定程度上减少刺激伪迹残留,但仍未解决对高频响应的检测问题。本文提出了双向滤波法去除刺激伪迹,避免了滤波时刺激伪迹影响后传的趋势。物理模拟实验及106例瞬态诱发耳声发射信号实测结果表明:与现有方法相比,该方法可进一步减少刺激伪迹残留,拓展不受刺激伪迹污染的信号区间;并能检测出潜伏期更短、强度更大的高频瞬态诱发耳声发射信号。同时,该方法简便易行,便于在实时检测系统中实现。