关于顺式聚乙炔共振喇曼谱的理论解释

本文建议以双极化子微观模型,根据多声子晶格弛豫理论解释顺式聚乙炔的喇曼谱。在准一维哈密顿量中考虑了电子与不同声子模的耦合,其耦合常数由红外及喇曼实验数据确定。理论计算结果与实验数据进行了比较和讨论。文中采用的方法可以推广到类似的系统 关键词：     

高效液相色谱柱稀匀浆填充方法

本文叙述一种新的高效液相色谱柱填充方法,此法采用粘度分布范围窄的细颗粒填充物(≤10±2μ)及低粘度溶剂制备稀的匀浆(≤4％)。在填充物颗粒没有沉降分级以前,用气动放大泵快速把匀浆压入色谱柱中,制备高效液相色谱柱。     

基桩完整性量化分析

本文针对国内广泛研究基桩低应变检测法的现状,基于阻尼振动和波动理论,结合波形拟合的分析思路,推导出模拟加速度实测信号的拟合方程,编制了MATLAB波形拟合分析程序,并做了试验桩检测验证。分析结果证明,推导的加速度信号方程能够正确模拟实测加速度信号。正确分析出缺陷桩的桩长、缺陷位置和缺陷程度。对实际检测工程有一定的指导意义。     

中职数学课教学局面堪忧

中等职业学校的数学课教学近些年出现了一些令人堪忧的局面,主要是: 一、学生厌学情绪严重.理科班(或全男班)的大部分同学,甚至整个班放弃学习数学(英语等基础课),文科班受其影响学习气氛也大不如前.     

Isolation and Identification of Phosphate-accumulating Strain PAO3-1 and Its Phosphorus Removal Characteristics

A phosphate-accumulating bacteria strain PAO3-1 was isolated from biological phosphorus removal sludge supplied with sodium acetate as carbon source under stable performance. This strain has good enhanced biological phosphorus removal effect on normal activated sludge system. Phosphorus removal ratio was raised form 44%with no added strain to more than 82% with strain strengthening biological phosphorus removal. It is identified to be AlcaUgenes sp. according to its morphology,biochemical characteristics and 16S rDNA sequence analysis. The cell of strain PAO3-1 is straight bacilli form, 0.4×1.1 μm, no flagellum, gram negative and special aerobiotic. The optimal temperature and pH for growth are 32℃-37℃ and 5.5-9.5, respectively. The shape of slant clone is feathery. The phosphate situation, which was 76. 5% higher than that in non-starving situation. Its phosphate release rate of log course in anaerobic phase and in culture without phosphorus was lower than that in log course.     

CrWMn钢细化强韧化的研究

本文利用ＣｒＷＭｎ钢刀片镶钢余热进行高温淬火，有效地抑制网状碳化物的析出。以高温回火代替球化退火，实现碳化物超细化。降低淬火加热温度．获得细小奥氏体晶粒。使ＣｒＷＭｎ镶钢刀片的抗弯强度与冲击韧性由δ-bb=1088MPa,α-k=19.6J/cm～2提高到δ-bb＞2466MPa,α-k＞88J/cm～2,HRC＞60，获得明显的强化韧化效果．     

高压下Fe73.5Cu_1Nb_3Si13.5B9纳米晶合金的形成

采用X射线衍射、电子衍射及透射电子显微技术研究了Fe73 .5 Cu1Nb3 Si13 .5 B9非晶合金在 82 3K ,1～ 5GPa下退火所形成的纳米晶结构 ,高压实验采用Belt型压力装置 .结果表明 ,压力没有改变合金结晶相的类型 ,但对其纳米晶结构的形成有重要影响 .当压力从常压增加到 5GPa时 ,结晶相α Fe固溶体 (α Fe相 )的尺寸从 1 1 .5nm减小至 5nm .当压力低于 2GPa时 ,α Fe相的体积分数随压力的增高而增加 ,然后随压力进一步增高 (P >2GPa)而减小 .还讨论了压力影响Fe73 .5 Cu1Nb3 Si13 .5 B9纳米晶合金形成的机制 .