Fabrication of transparent La2Hf2O7 ceramics from combustion synthesized powders

Transparent La₂Hf₂O₇ (LHO) ceramics were, for the first time, successfully fabricated from combustion-synthesized powders. Nanosized La₂Hf₂O₇ powders were obtained through combustion reaction, using glycine or EDTA as a fuel. The as-made powders were isostatically pressed at 180 MPa and then sintered at 1850 °C for 6 h in hydrogen atmosphere. The resulting ceramics have high optical transmittance.     

升温速率对金属熔化和过热的影响

采用分子动力学方法和QSC(Quantum Sutton-Chen)力场研究了升温速率对金属银和金属铅的熔化和过热行为的影响。研究结果表明，升温速率对金属银和铅的熔化和过热行为有很大影响，随着升温速率的升高，金属的熔点有所升高。高的升温速率会导致金属体系内部无序化程度增加，降低了熔化相变的能垒。升温速率导致的银和铅完美晶体的过热极限分别为1450K和800K。     

安全分析程序SAC-PREARS的开发

介绍了SAC-PREARS程序的基本数学模型。利用MISAP程序和通用程序TRAC-PFI对SAC-PREARS计算结果进行了验证。结果表明：SAC-PREARS程序能够有效地计算和分析核供热堆PRHRS的稳态和瞬态热工水力特性。     

基于USB接口技术的多道核谱分析仪的设计

介绍了一种较新的采用USB接口技术的多道核谱获取系统，阐述了P89C51RD2单片机与A／D转换器和USB控制器之间接口应用的软件与硬件技术要点。     

城市居住区详细规划中的生态设计

首先提出在居住区规划中进行生态设计的理念及这一设计要依据的原則和生态学原理,然后概括出其涉及的主要内容与具体设计方法.     

素质教育与高校体育教学

从素质教育的内涵、特点、教学方法、手段等方面对高校体育教学中的素质教育进行探索。     

汉语三字词声调的模式分析

汉语三字词的声调模式是复杂的。本文对4 男4 女各192 个三字词的声调进行分析,选择各音节的头尾差和相对调位比为特征,在进行特征抽取、统计和分析的基础上,研究了三字调整声调的模式和变调规则。本文的结果对三字词和连续语音声调的识别具有重要价值。     

Structure, Phonon Vibration, and Spin Correlation of LaBa2Cu3−x Co x O y

Polycrystalline samples LaBa₂Cu_3?xCo _x O _y (0 ≤ x ≤ 1.0) were synthesized by solid state reaction method. The structure, phonon vibration, conduction, and spin correlation were investigated by means of X-ray diffraction, infrared spectra, resistivity, and electron spin resonance. It is found that there are orthorhombic–tetragonal and tetragonal–orthorhombic structural transitions with Co doping, and the conduction behavior changes from metallic to semiconducting. With the increase of Co content, the Cu(1)—O(1) phonon mode around 531 cm^?1 softens, the Cu(2)—O(2) phonon mode around 657 cm^?1 hardens, and the Cu(1)—O(4) mode around 583 cm^?1 is nearly unchanged. The Cu²⁺ spins tend to localize with Co doping. The changes in structure, phonon vibration, and spin correlation with Co doping are analyzed and discussed.     

锌板带连铸连轧机组电气控制系统

本文介绍我院为万县电池厂开发设计的250mm锌板带连铸连轧机组的电控系统的组成及控制特点，并根据现场调试运行情况对设计中需要注意的问题进行了重点阐述。