The influence of impurity on the critical thickness of the CeO_2 buffer layer for coated conductors

The lattice parameters, band structure, density of state and elastic constant of RE-doped CeO2 (RE=Sm, Gd, Dy), the buffer material for coated HTS conductors, are calculated using the plane-wave method with pseudopotentials based on the density functional theory (DFT) of first-principle. The rule and mechanism of the effect of rare earth impurity on the critical thickness of the CeO2 buffer layer are investigated. It is found that, in the range of the calculation, the changes of the lattice volume V and ela...     

第十九届全国波谱学学术年会征文通知

<正>中国物理学会波谱学专业委员会决定于2016年8月17日至8月20日在甘肃省兰州市召开第十九届全国波谱学学术年会,会议由兰州大学功能有机分子化学国家重点实验室承办.会议将交流波谱学领域最新学术思想与发展动态.会议拟邀请国内外知名学者、波谱学专家作特邀专题报告.波谱学专业委员会热烈欢迎与波谱学有关的同行踊跃参加.会议期间将评选第十二届王天眷波谱学奖(该奖已被科技部批准为社会力量设奖奖     

近红外光谱研究水与甲醇混合溶液的氢键作用

对于浓度为0～100wt％(浓度间隔为5wt％)的水-甲醇混合溶液的近红外光谱,通过分析OH组合谱带和倍频谱带随浓度的变化,探索了水-醇溶液中的氢键作用。由于OH谱带在近红外区域重叠比较严重,采用了不同的光谱分析方法——二阶导数、主成分分析和二维相关分析来提高光谱分辨率,进而达到从水-甲醇溶液的近红外光谱获取有用信息的目的。定性地阐述了水-醇混合溶液中的水和醇之间通过氢键的可能结合方式,为探索水-醇混合溶液中的氢键作用提供了一种新的可能性。     

两重外腔的自混合干涉及其信号分析

提出了具有两重外腔的自混合干涉。根据半导体激光器的自混合干涉理论，研究了两重外腔自混合干涉模型，及其信号的调制和解调方法。该方法用一个附加的参考反射镜在半导体激光器(LD)和目标间形成两重外腔，参考外腔用于补偿光学频率涨落引入的相位误差。用快速傅立叶变换相位探测技术(FFT)分析自混合干涉信号。运用这些方法，可提高相位测量精度，在微光机电系统、光学工程和其他工程应用上有潜在的实用价值。     

MPCVD金刚石的Raman光谱分析

用微波等离子体化学气相淀积法（MPCVD）在Si基片上生长了金刚石薄膜，通过对其进行Raman光谱分析，一次表征了金刚石的结构，纯度及应力状况等材料性能，同时并研究了生长过程中微波功率与金刚石性质的关系。研究表明，微波等离子体化学气相溶积法生长的金刚石薄膜，除了金刚石成分的生长外，还会有部分非金刚石成分的生长，金刚石的纯度与微波功率的关系不明显，另外此种方法生长的金刚石薄膜主要表现为张应力。     

Synthesis and Characterization of Novel Mercapto-end Ferrocenyl Derivatives with Schiff Base Linkage

Novel ferrocenyl derivatives of p-(10-mercaptodecyloxy)benzal 4-ferrocenylaniline have been prepared and characterized by element analysis,HNMR,and FAB=MS,Cyclic voltammetry has been used to characterize the self-assembled monolayers formed from the compounds on the gold electrodes.     

High temperature property studies of the 6H-SiC MOS capacitor

N-type and p-type 6H-SiC metal oxide semiconductor (MOS) capacitor samples are fabricated with a typical method,and the high frequency capacitor voltage (C-V) curves of these samples are measured at temperatures ranging from 293 to 533 K.There exists huge difference between the n-type and p-type samples.Flat-band voltage shift of the n-type sample becomes larger with temperature rising,but that of the p-type sample have very little change.This may be caused by the residual Al in the p-type oxide.Both types ...     

Revisiting H/Pt(111) by a combined experimental study of the H-D exchange reaction and first-principles calculations

We report a detailed investigation of the behavior of chemisorbed hydrogen atoms (Ha) on Pt(111) by a combination of an ex-perimental study of the Ha + Da reaction and first-principles calculations. The coverage-dependent adsorption and desorption behavior of Ha and Da on Pt(111) have been systematically established and can be well interpreted in terms of repulsive inter-actions between adsorbates. Ha adsorbs exclusively on the face-centered cubic (fcc) sites of Pt(111) at coverages not exceeding 1 monolaye...     

La0.67Ca0.33MnO3薄膜中的各向异性应变与电荷有序

本文采用脉冲激光沉积法在NdGaO3(001)单晶衬底上制备了一系列的La0.67Ca0.33MnO3薄膜,实验主要研究了薄膜的输运性质.La0.67Ca0.33sMnO3块材是铁磁金属基态,而La0.67Ca0.33MnO3/NdGaO3(001)薄膜由于各向异性应变的存在,可以观测到电荷有序绝缘相的出现.薄膜样品表...     

THE OBSERVATION OF INTERNAL MOTION OF LINEAR POLYSTYRENE CHAINS IN CYCLOHEXANE AROUND 0 TEMPERATURE

A high molecular weight (M_w=1.85×10~7) polystyrene (PS) with narrow distribution was prepared by high vacuum anionic polymerization in tetrahydrofuran.By use of dynamic light scattering,the dynamics of PS chains in cyclohexane was studied around theθtemperature.For the first time,we have observed the internal motion of polymer chains in solutions below theθtemperature by using dynamic light scattering at smaller angles (even qR_g<1).