主客体结构纳米半导体光催化的界面钉住效应

研究 了主客体 纳米结构 Ｚｎ Ｓ 半导 体在 光 催化 甲 醇水 溶液 产 氢同 时产 乙 二醇 反应 中 的界面“钉 住效应”． 认为在 主体 β环 糊精（ β Ｃ Ｄ） 分子 包覆作用 下,客体 Ｚｎ Ｓ 的 界面 能带 被钉 住; 溶液酸碱性 的变化, 在很大程 度上通过 改变溶 液相中各 种氧化 还原电 对来 间接 影响 客体 的界 面电 荷输出行为 ． 由此 观点出发 ,并结合 已有的 光电实验 结果,解 释了主 客体 包容 物 Ｚｎ Ｓ／ β Ｃ Ｄ 的 最高 光催化产氢 活性发 生在溶液 ｐ Ｈ ＝ １０ ～１１ 的实 验现象．     

RIBLL中的TOF测量

描述了一种为兰州放射性核束流线(AIBLL)研制的时间拾取装置.次级束引起闪烁薄膜发光,椭球面镜聚焦,光电倍增管读出,CAMACTDC记录次级束的飞行时间.其时间分辨可以达到140ps,计数率可以达到10⁸pps.     

用位置灵敏光电倍增管读出的CsI(Tl)探测器

报道了用双维位置灵敏光电倍增管读出的CsI(T1)探测器,其CsI(T1)晶体厚度为10mm,灵敏面积为60mm×60mm.探测器的空间位置分辨为0.81mm(FWHM).用蒙特卡罗的方法对该探测器作了进一步模拟研究,其结果与实际测试的结果很好地一致.     

由邻苯二甲酸二乙酯制备水合茚三酮的反应机理探讨

以邻苯二甲酸二乙酯为原料,经Claisen酯缩合反应、酸性酯水解反应、热脱羧反应、亚硝化反应、脱肟反应、羰基还原反应、Aldol反应、邻二醇氧化裂解反应制备了水合茚三酮,对各步的反应机理进行了详细的讨论。     

稀土和碱土钼氧化物上甲烷选择氧化

白钨石ABO_4复合氧化物在烯烃氧化中起着重要作用,但在烷烃催化氧化中的研究并不多,有关稀土氧化物催化剂的研究则更少。本文以Mg、La、Ce、Eu的钼酸盐作为甲烷选择氧化催化剂,每种催化剂制成不同A/B值系列,以考察催化剂结构和氧化活性的关系。     

Study on preparation and properties of molybdenum alloys reinforced by nano-sized ZrO<Subscript>2</Subscript> particles

The nano-sized ZrO₂-reinforced Mo alloy was prepared by a hydrothermal method and a subsequent powder metallurgy process. During the hydrothermal process, the nano-sized ZrO₂ particles were added into the Mo powder via the hydrothermal synthesis. The grain size of Mo powder decreases obviously with the addition of ZrO₂ particles, and the fine-grain sintered structure is obtained correspondingly due to hereditation. In addition to a few of nano-sized ZrO₂ particles in grain boundaries or sub-boundaries, most are dispersed in grains. The tensile strength and yield strength have been increased by 32.33 and 53.76 %.     

Sr2NiMoO6−δ as anode material for LaGaO3-based solid oxide fuel cell

The double-perovskite Sr₂NiMoO_6−δ (SNMO) was investigated as an anode material of a solid oxide fuel cell (SOFC). With a 300 μm thick La_0.9Sr_0.1Ga_0.8Mg_0.2O_3−σ (LSGM) disk as electrolyte and Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δ as the cathode, the SNMO anode showed power densities of 819 mW cm⁻² in hydrogen at 1123 K. Moreover, there was no buffer layer between anode and electrolyte, which would reduce design techniques and save design cost. After test no chemical reaction was discovered between anode and electrolyte. The anode exhibited good conductivity and the value was around 60 S cm⁻¹ in H₂. Also it had almost linear thermal expansion from room temperature to 1253 K and the average thermal expansion coefficient was about 12.14 × 10⁻⁶ K⁻¹, which was quite close to that of La_0.9Sr_0.lGa_0.8Mg_0.2O₃ (12.17 × 10⁻⁶ K⁻¹) electrolyte.     

Bi-doped borosilicate glass as sealant for sodium sulfur battery

Bi-doped borosilicate glasses as sealants for sodium sulfur battery are developed. The joining properties involving hermeticity, wetting behavior, bonding strength, thermal shock resistance and corrosion resistance have been systematically investigated. As found, the joints achieve good hermeticity by bulk joining. The wetting behavior and bonding strength are governed by the joining temperature and Bi₂O₃ content. The higher temperature and higher Bi₂O₃ content induce better wetting behavior due to the low viscosity. The thermal shock resistance of the alpha-alumina/glass/beta-alumina joint is dependent of the thermal expansion match between the glasses and alpha-, beta-alumina. No microcracks are found in the glasses containing 12–42 wt.% Bi₂O₃ after 200-times thermal shock. The glass/alumina joints show good anti-corrosion behavior against sulfur, especially containing 42 wt.% Bi₂O₃.     

小波分析在测试信号分析中的应用

本文给出了小波的基本原理和构造方法以及小波分析的快速算法，将小波分析方法（ＷＡＭ）引入到非平稳冲击信号的分析中，作为小波分析应用实例，对汽车齿轮箱的断齿测信号进行了分析，给出了分析结果     

Nielsen方程的广义梯度表示及其稳定性分析

研究Nielsen方程的广义梯度表示以及方程零解稳定性．首先给出4类广义梯度系统及其性质．其次,给出完整系统和非完整系统的Nielsen方程转化成广义梯度系统的条件;将两类Nielsen方程分别化为广义梯度系统并研究方程的零解稳定性．最后,举例验证结果的应用并通过数值模拟验证结论的准确性．