PEO型精密超声声速仪

木文介绍用脉冲回波重合法精密测量超声声速的仪器.超声脉冲发射、接收、以及显示部分组装成整机,使操作方便,性能稳定可靠.主控信号使用特制的步进为0.1Hz、频率稳定度为10~(-9)/s的PZS-1型频率综合仪,更提高了测量精度.     

QCM 表面自组装胱氨酸1，3－桥连杯[4]芳烃膜用于识别气相丁胺

Two cystine-bearing 1,3-bridged calix[4]arenes were used as the coatings of the quartz crystal microbalance (QCM) with gold electrodes. The two calix[4]arene derivatives were self-assembled onto the gold electrode surface by the covalent attachment between the di-sulfur and gold. The compound of cystine-bearing bi-phenylalanine 1,3-bridged calix[4]arene (CPC) with longer alkyl chain had better self-assembled capacity onto the fresh surfaces of gold electrode than that of cystine-bearing 1,3-bridged calix[4]arene (CC) with comparably shorter alkyl chain.The modified QCM sensors were used to recognize the butylamine isomers in gas. The results showed that the QCM coated with both compounds had preferential affinity to n-butylamine, then i-butylamine, t-butylamine in the range of low concentrations, indicating that in the recognition process, the steric hindrance effect played an important role when forming complex with guest molecules. When the concentrations of the analytes were increased, the polarity and the magnetism of the butylamine became determinative factors. The reversibility was improved greatly and the equilibrium time was much shorter on the self-assembled film than on the film obtained by dropping coating.     

具有连续核的Fredholm第二型方程的有限元解及其在激光物理中的应用

本文以光学谐振腔为背景,提出具有连续核的Fredholm第二型积分方程的有限元解,并以无限长平行平面带镜腔、倾斜平面带镜腔、圆镜腔等具体例子的计算结果。与FOX和Li以迭代法计算结果进行比较,其中重合部分得到一致的结果。此外,本方法同时算得一系列未见公布的共振模的场分布及损耗率曲线。     

以含氨基酸1,3-桥联杯[4]芳烃为涂层的压电石英传感器对有机胺和有机醇的选择性识别研究

分别以三种新型含氨基酸1，3-桥联杯[4]芳烃衍生物作为压电石英传感器的敏感涂层，测定了一系列相同浓度的有机胺和有机醇蒸气．三种敏感涂层均对正构胺和正构醇表现出明显高的响应值．烷烃基支链越多，相应的频率变化就越小，说明涂层膜对气体分子的选择性识别主要是分析物的位阻效应、氢键及空腔疏水力共同作用的结果．含胱氨酸的1，3-桥联杯[4]芳烃衍生物涂层对各种蒸气的响应值均高于另外两种涂层，桥联杯芳烃的构象和衍生桥环的大小及构成均对涂层识别胺和醇的异构体有重要影响．本文也研究了实验条件的优化．     

含小孔光阑的谐振腔选模优化设计

本文从全衍射理论出发，建立小孔选模腔的计算模型并设对出相应的优化软件包。该软件可直接对圆形反射镜构成的小孔腔进行关于小孔位置和孔径大小的优化计算，并研究小孔选模腔的选模特性随小孔位置和孔径变化的规律。     

高碳钢中的稀土碳化物

通过电解分离，Ｘ射线衍射以及气相色谱分析，研究了稀土在高碳钢的存在形态。结果表明：高碳钢中存在稀土碳化物。     

一种构建多取代吡唑的新策略

以简单苯乙炔与醛酮加成得到的炔丙醇作为原料,在外在氧化剂(吡啶氮氧)和金催化剂存在的条件下,经历α-羰基金卡宾中间体和σ键迁移得到1,3-二酮化合物,再简单处理后与水合肼反应,以较好的收率得到多取代的具有潜在生物及药理活性的吡唑类化合物.形成α-羰基金卡宾和扩环成酮的策略也可以实现在串联反应中,由一步卡宾关环衔接,得到结构新颖的多环双酮类化合物.