Structural properties of 0.65Pb(Mg1/3Nb2/3)O3–0.35PbTiO3 relaxor ferroelectric thin films on SrRuO3 conducting oxides

Coating of 0.65Pb(Mg_1/3Nb_2/3)O₃–0.35PbTiO₃ (PMN–PT) relaxor ferroelectrics by a sol–gel method is followed by growth of epitaxial SrRuO₃ (SRO) metallic oxide electrodes on SrTiO₃ (STO) single-crystal substrate by pulsed laser deposition. High-quality PMN–PT films on SRO with preferred growth orientation were successfully fabricated by controlling the operation parameters. Structural properties of relaxor ferroelectric PMN–PT thin films on SRO/STO substrates have been studied by X-ray diffraction (XRD), transmission electron microscopy (TEM) and atomic force microscopy (AFM). In-plane and out-of-plane alignments of the heterostructure are confirmed and the structural twinning of the materials are also revealed.     

扫描探针制备技术的研究现状及发展

探讨了近几年来探针制备技术的发展和趋势,分别就探针检测性能的改进、探针结构、探针检测功能拓展及多通道信息采集组合探针等几方面,对相关制备技术的方法、特点以及相应检测条件、适用环境展开讨论,这些方面反映探针制备技术正朝着尖锐化、多样化、功能化和组合方向发展。     

大角度倾转法在碳化物研究中的应用

蠕变过程中碳化物形貌，类型，数量和分布状态的变化直接影响着材料的高温性能，因而在材料的蠕变得到了广泛的重视，介绍了一种在碳膜萃取复型样品上利用Ｈ－８００透射电子显微镜的双倾样品台进行了大角度倾转，来观察碳化物形貌并鉴定其类型的试验方法。     

IR spectroscopic study of Pt/Kl zeolites using adsorption of CO as a molecular probe

FTIR spectra of CO adsorbed on Pt/KL catalysts show that the relative band intensities and the total dispersion markedly depend on the catalyst preparation method (ion exchange, incipient wetness impregnation or co-impregnation with KCl). The CO stretching frequency of the dominant band for linear CO is shifted to higher wavenumbers, parallel with the proton concentration in the reduced catalyst, which is derived independently from the intensity of the IR bands of the OH groups. The results are in accordance with the model that electron-deficient platinum particles are platinum-proton adducts.On leave from: N.D. Zelinsky Institute of Organic Chemistry, Academy of Sciences, Moscow, USSR.     

同时含有稀土元素La Ce Pr Nd的材料的电子探针定量分析方法

研制了稀土六硼化物单晶LaB_6、CeB_6、PrB_6和NdB_6电子探针分析标样。根据X-射线峰位表和实测的特征X-射线谱,考察分析了La、Ce、Pr和Nd元素谱线之间的干扰情况,发现分析谱线PrLα_1受到L_αLβ_1线严重的干扰。以混合稀土金属为试样,采用扣除谱线重叠强度的背底非对称测量等方法对L_n、Ce、Pr和Nd进行了电子探针定量分析,其结果与荧光X-射线光谱分析结果符合较好。     

Interaction between bubbles and fibre optic probes in a bubble column

Spherical bulb fibre optic probes, developed and applied for bubble characterization in a bubble column and a slurry bubble column at high temperature, were investigated. The principle of operation of these new optical fibre probes is based on the difference in refractive indices between the gas and the liquid phases. The interaction between the gas bubbles and the fibre optic probes in a bubble column was studied using photographic techniques. The first objective of these experiments was to study the response of the sensors upon contact with gas bubbles of various sizes. The second objective of this study was to establish, under controlled situations, the optical probe bubble detection performance and ability for local quantitative measurements of the bubble rise velocity and the gas hold-up.     

利用测量头测量圆孔中心操作的简化

利用机床提供的顾客软体 (变量 ) ,通过三点确定一个圆心的公理 ,精确测定圆心位置座标     

微波场中光纤探头温升的研究

当把光纤温度传感器置于微波场中测温时，由于受电磁场的作用，传感头内部将有能量损耗，以致发生测温偏差。本文将传感头简化成有限长圆柱，计算出在微波场中传感头的能量损耗和温度变化。最后还分析了一种实际热色效应光纤温度传感器。     

基于环探头测量含运动导体的瞬态电流波形

电流除了用罗果夫斯基线圈进行测量外,还可通过环探头测量电流产生的磁场来计算得到。直线电机除了位置固定的母线导体外,还有沿母线运动的电枢;母线回路注入脉冲电流后,电枢会被加速而运动。简化母线和电枢为线电流模型,在长线模型基础上,通过环探头测量得到的磁场计算出近似电流波形。因为探头所测磁场主要由其附近电流所贡献,所以合理配置电枢起始位置与探头位置后,电枢运动对电流测量的影响很小。在瞬态电流上升沿、平台区和下降沿的不同阶段,利用实验折算的系数,可得到时域瞬态电流波形,其测量结果与用罗果夫斯基线圈测量波形一致。