Pb_(0.85)Ca_(0.15)TiO_3纳米晶铁电—顺电相变的拉曼光谱研究

采用变温ＦＴ Ｒａｍａｎ技术测定了三种粒径Ｐｂ０．８５Ｃａ０．１５ＴｉＯ３纳米晶的居里温度。１７８９ｎｍ、２５．６９ｎｍ、和３６２５ｎｍ粒子的Ｔｃ分别为２７４℃,２６５℃,２９４℃。认为尺寸效应和掺杂引起的缺陷均对Ｔｃ产生影响。掺杂及焙烧不充分引起的晶体缺陷使居里点弥散。Ｅ（１ＴＯ）软模具有弱阻尼特征     

准二维电荷密度波导体磷酸钨青铜(PO2)4(WO3)2 m(m=6)的磁电阻研究

对准二维电荷密度波导体磷酸钨青铜(PO₂)₄(WO₃)_2m(m=6)在2—300K温区内的磁电阻及在2K时的Δρ/ρ_０-B关系进行了 实验研究.利用电子磁击穿模型对其低温端的磁阻增强行为进行了分析解释,理论和实验相 符合,并估算出高温端第一个Peierls能隙的大小为3.0meV,电子在低温下的迁移率为0.0 42m²V^-1s^-1 关键词： 低维导体磁电阻 电荷密度波     

The Solgel Preparation and Electric Properties of MnO2-doped PbTiO3 Ceramics

ＴｈｅＳｏｌ┐ｇｅｌＰｒｅｐａｒａｔｉｏｎａｎｄＥｌｅｃｔｒｉｃＰｒｏｐｅｒｔｉｅｓｏｆＭｎＯ２┐ｄｏｐｅｄＰｂＴｉＯ３ＣｅｒａｍｉｃｓＱＩＡＮＧＬｉａｎｇ－ｓｈｅｎｇ＊,ＦＵＨｏｎｇ－ｇａｎｇ＊＊ａｎｄＸＵＣｈｏｎｇ－ｑｕａｎ（Ｄｅｐａｒｔｍｅｎｔ...     

负载型三氧化钼催化剂表面结构和表面酸位的激光Raman光谱研究

测定了MoO3/γ-Al2O3、MoO3/TiO2、MoO3/SiO2的激光Raman谱. 通过MoO3/γ-Al2O3、MoO3/TiO2在吡啶吸附前后、氨水提取前后的谱图对比说明, 单层分散的MoO3, 即特征峰为～950cm^-^1的"二维聚钼酸"中钼的配位状态不是单一的,其中一种表面含钼物种(Mo-1)不吸附吡啶, 不溶于氨水, 不显示较强的表面酸性; 另一种表面含钼物种(Mo-2)可吸附吡啶, 溶于氨水, 与催化剂的表面酸位密切相关. 我们认为Mo-1为四面体配位的钼; Mo-2为八面体配位的钼. MoO3/SiO2中的MoO3能100%被氨水溶去, 其酸位数与表面Mo^6^+数之比接近1, 是由其中Mo-2的比例较高, 载体与活性组分之间的相互作用较弱这两个因素所造成的。     

正型重氮感光材料成像性能的研究

为提高重氮感光材料的成像性能,对正型重氮感光材料的光谱感度、重氮盐与偶合剂的自偶合效应,偶合活性和所生成的偶氮染料的发色效率,溶剂效应及图像的色牢度等进行了试验研究,为成功制作出高质量的重氮感光材料提供了基础。     

Ellipse-Like Orbital Angular Momentum Multiplexed Holography and Efficient Decryption Utilizing a Composite Ellipse-Like Lens

The utilization of orbital angular momentum (OAM) as an independent degree of freedom for information encryption has gained significant attention. Nevertheless, the multiplexing capacity of OAM is still constrained, and there is a lack of research on accelerated decryption techniques in OAM multiplexed holography. In this study, ellipse-like orbital angular momentum (EL-OAM) multiplexed holography is proposed and implemented. The ellipse-like (EL) beam incorporates three modulatable parameters: topological charge, power index, and radial shift. To achieve efficient decryption, a composite ellipse-like lens (CELL) is introduced that generates two EL beams carrying different OAMs at distinct axial positions, resulting in two reconstruction holographic images with approximately equal intensity. The mode selectivity of EL-OAM based on the aforementioned parameters is investigated. Experimental verification demonstrates the feasibility of EL-OAM multiplexed holography and its potential for fast decryption in various dimensions. This breakthrough opens up new possibilities for practical information encryption and decryption systems.