PbZr0.52Ti0.48O3薄膜红外椭圆偏振光谱研究

用磁控溅射法在Pt/Ti/SiO2 /Si衬底上制备了PbZr0 .52 Ti0 .4 8O3(PZT)薄膜 .XRD结果表明经过退火后的PZT薄膜呈现多晶结构 .通过红外椭圆偏振光谱仪测量了λ为 2 .5～ 12 .6 μm范围内PZT薄膜的椭偏光谱 ,采用经典色散模型拟合获得PZT薄膜的红外光学常数 ,同时拟合得到未经处理的PZT薄膜和退火后PZT薄膜的厚度分别为 45 4.2nm和 45 0 .3nm .最后通过拟合计算得到结晶PZT薄膜的静态电荷值为 |q|=1.76 9± 0 .0 2 4.这说明在磁控溅射法制备的PZT薄膜中 ,电荷的转移是不完全的 .     

考虑弯道环流影响的平面二维水流泥沙数学模型

弯道环流是影响断面流速和含沙量分布的重要因素。本文提出了通过求解立面二维弯道环流运动的方法,在平面二维水流泥沙数学模型中考虑弯道环流的作用。该方法适用范围广,增加计算工作量不太大。     

A simple correlation for gas bubbles rising in power‐law fluids

Recently, the author (Rodrigue, 2001 a, b) proposed a generalized correlation for the steady rise of gas bubbles in uncontaminated viscous Newtonian fluids of infinite extent. It is the purpose of this note to show that this model can be modified for inelastic non‐Newtonian power‐law fluids. Using data taken from six different studies, it is shown that the modified model can predict quite nicely the bubble velocity for these non‐Newtonian inelastic fluids.     

MITI projects on recycling

MITI has actively done R&D on industrial technology for waste and reclamation and so there are many research items from small scale to large scale. However, Ecofactory and researches on recycling of metallic materials are introduced here. Ecofactory was proposed by the Mechanical Engineering Laboratory and is now at the stage of the Leading Research, a new research scheme in AISt. Researches on recycling of metallic materials are being done with subsidy. Those researches should contribute to both the preservatin of the global environment and effective recycling of waste materials.Abbreviations AIST Agency of Industrial Science and Technology - MITI Ministry of International Trade and Industry - NEDO New Energy and Industrial Technology Development Organization     

Prediction of axial velocity profiles and solids hold-up in a rotary kiln

Axial bed depth profiles were experimentally measured in a rotary kiln containing ilmenite particles under steady state and transient conditions. The variables include feed rate of solids, inclination and rotational speed of the kiln. and dam height. The variation of the axial velocity with kiln axis was estimated. The semi-experimental model proposed by Perron and Bui (1990) was modified to include the effect of the variables of the present study. The mean residence time of solids was estimated from the fractional hold-up and expressed in terms of the process variables. The transients induced by a step change in any of the operating conditions were measured as variation of discharge rate of solids with time.     

外焊缝自动跟踪系统

介绍了外焊缝自动跟踪系统的组成及工作原理，简述了传动部分ＧＴＲ－ＰＷＭ调速系统，给出了系统的硬件电路。该跟踪器具有结构简单，体积小，性能稳定等特点，在生产线上获得了成功的应用。     

广义分散控制系统有穷固定模的判别

本文研究了广义分散控制系统有穷固定模的判别问题，给出了一个确定有穷固定模的新算法，这种算法适用于任意的反馈结构。     

9．5－32mm波段大气衰减随仰角变化的实验研究

在实测和分析３２、１４．６、１２．５和９．５ｍｍ波段大气衰减的基础上，研究了大气衰减随仰角变化的规律；讨论了仰角为３～９０°时计算大气衰减的简化计算公式；给出了大气等效高度与地面水汽密度的关系式，对大气衰减和等效高度的实测值与理论值进行了比较和分析．     

低速爆轰管对黑火药的点传火性能研究

文章采用中心点火管结构的实验装置研究了黑火药的点传火性能。用低速爆轰 (L VD)中心点火管来点燃黑火药时 ,1# ～ 3# 大粒黑药的传火速度为 70 0 m· s-1～ 80 0 m· s-1数量级 ,燃烧波宽度在 3.1ms～ 3.5 ms,最大压力峰值 :1# 为 36 .4 MPa,2 # 为 2 4 .0 MPa,3# 为 38.0 MPa。用普通中心点火管点燃黑火药时 ,2 # 、3# 和钝化 2 # 大粒黑的传火速度分别为 6 1.2 m· s-1、6 8.2 m·s-1和 4 0 .1m· s-1,最大燃烧波宽度分别为 9.2 ms、6 .3ms和 9.5 ms。燃烧波表明 ,L VD中心传火管与普通中心传火管相比较 ,在传火管的不同位置处 ,前者的 P- t曲线一致性远高于后者。