Synthesis and Properties of Novel Luminescent Compounds Containing Triphenylamine and Bipyridine Units

Blue luminescent compounds T1-T4 containing triphenylamine donors,bipyridine acceptors and olefinic linkers were synthesized and characterized by 1H NMR,13C NMR and high resolution mass spectrometry(HR...     

A DOUBLE-TEMPERATURE-GRADIENT TECHNIQUE FOR THE GROWTH OF PURE C60 SINGLE CRYSTALS FROM THE VAPOR PHASE

Pure C₆₀ single crystals were grown by a sublimation-condensation method in an evacuated dosed quartz tube situated in a double-temperature-gradient furnace. Large C₆₀ single crystals, up to a size of 0.6 mm×1.0 mm×2.0 mm with quite smooth and shiny faces, were obtained. X-ray diffraction, electron diffraction and X-ray morphology were carried out and showed that the quality of large C₆₀ single crystals grown by the double-temperature-gradient technique is excellent. In this paper the experimental results of the growth of large C₆₀ single crystals are reported and the morphological and structural characterizations are discussed in detail.     

“PPAS” X-RAY ABSORPTION SPECTROSCOPY IN LASER-PRODUCED ALUMINUM PLASMA

We have developed and successfully demonstrated the "point projection absorption spectroscopy (hereafter abbreviated to PPAS)" technique to record keV X-ray absorption spectra in the coronal region of laser produced aluminum plasma which provides spatial information in the corona. Absorption spectrum of the Al Ⅻ 1s²-1s2p resonant line for time delays up to 250, 500 and 750 ps after the peak of the incident laser pulse have been observed. Analysis of an absorption spectrum should allow a high spatial resolution (< 25μm) history of the absorbing ion population density to be determined. The 1-D hydro-code JB19 has been used to simulate the experiment and the predictions are compared to the observations. Such comparison can be useful in validating parts of the codes used for gain prediction on recombination X-ray laser transitions.     

基于激发态吸收的C60分子全光开关特性研究

用５３２．０ｎｍ的脉冲Ｎｄ：ＹＡＧ激光作为泵浦光，７４７．０ｎｍ的连续半导体激光作为探测光，在Ｃ₆₀甲苯溶液中，利用Ｃ₆₀分子的三重态－三重态非线性吸收效应，获得Ｃ₆₀分子的全光开关和全光调制特性，并用速率方程进行了动力学数值模拟，得到与实验相一致的结果。 关键词：     

脉冲红外激光诱发SiH4+CH4解离动力学研究

采用光学发射谱（ＯＥＳ）技术对脉冲ＴＥＡ ＣＯ₂激光诱发ＳｉＨ₄＋ＣＨ₄系统击穿产生的等离子体辐射进行了时间分辨的光谱测量。结果表明等离子体内分子的各碎片发光均在气体击穿时刻开始出现，但具有不同的时间特性，由此探讨了气体分子的分解过程。分析结果支持激光诱发ＳｉＨ₄＋ＣＨ₄等离子体内的主要离解通道为产生Ｓｉ，Ｃ原子通道的分解动力学机制的解释。据此观点讨论了气体分解碎片间的反应过程。实验与理论符合较好。 关键词：     

三元合金Cu76Ni15Sn9的离子溅射研究

在２７ｋｅＶ Ａｒ⁺离子轰击时,用收集膜技术结合俄歇谱仪（ＡＥＳ）,研究了三元合金Cu₇₆Ni₁₅Sn₉系统的择优溅射行为。同时使用扫描电子显微镜（ＳＥＭ）与电子探针微分析（ＥＰＭＡ）．观察了靶点表面形貌变化并测定了形貌特征微区的合金组份原子的相对百分浓度。结果表明,Ｃｕ原子较Ｎｉ原子、Ｎｉ原子较Ｓｎ原子,在所测定范围（０─６０°）内择优发射。最后讨论了靶点表面形貌特征和“元素局域富集”现象对择优溅射过程的影响。 关键词：     

Hybrid Optical-Electronic Implementation of Morphological Edge Detection

ＨｙｂｒｉｄＯｐｔｉｃａｌ－ＥｌｅｃｔｒｏｎｉｃＩｍｐｌｅｍｅｎｔａｔｉｏｎｏｆＭｏｒｐｈｏｌｏｇｉｃａｌＥｄｇｅＤｅｔｅｃｔｉｏｎ￥ＹＵＡＮＳｈｉｆｕ；ＺＨＡＮＧＸｕｅｒｕ；ＺＨＡＯＳｈｉｊｉｅ；ＬＩＹａｎ；ＣＨＥＮＬｉｘｕｅ（Ｄｅｐａｒｔｍｅｎｔ...     

关于虚拟激励法的一个注记

从具有随机频率与随机相位的随机谐和函数出发,证明了当随机频率与相位均为均匀分布而随机幅值与功率谱密度平方根成正比时,该随机过程的功率谱即精确地等于目标功率谱.进而表明:只需遍历频率区间,即可由单一谐和函数激励下的响应幅值给出响应的功率谱密度,从而揭示了虚拟激励法的物理意义.研究还表明:为了给出结构响应的功率谱密度,实际...     

解析电喷雾质谱法对感冒药中对乙酰氨基酚的快速检测

基于常压质谱的直接、快速、无需样品预处理检测的优势,该文拓展了其在药物质检领域的应用。采用自行搭建的解析电喷雾(DESI)装置,对常用感冒药对乙酰氨基酚片进行快速质谱检测,无需样品预处理,直接获得药片中有效成分的分子结构信息。为克服基质差异对定量分析的影响,以淀粉为基质构建对乙酰氨基酚模拟药片,在优化的基础上进行定量实验。针对实际药片中高浓度对乙酰氨基酚检测的需要,研究了其在较高浓度范围的定量关系,结果显示,方法对0.35～4.52 mg/mm²范围内的对乙酰氨基酚具有较好的线性关系(r²=0.998 2),定量下限为1.903 ng/mm²,检出限为0.237 ng/mm²,加标回收率为102%～114%。对3种市售的对乙酰氨基酚片进行直接检测,与厂家提供的标准数据相比,相对标准偏差(RSD)为7.2%～12%,表明方法具有较好准确度。该工作很好地证明了DESI-MS在药品快检中的优势,从而为药品质检提供了潜在的高效、可靠的检测手段。     

有限循环群上的 Cayley 有向图的哈密顿回路

给定有限循环群G及其特征集M(记为 G=〈M〉),在G上以M为特征集的Cayley有向图Γ(M,G) 定义如下:Γ(M,G)的顶点为 G 的元,当且仅当 g∈G,s∈M 时,在Γ(M,G)中存在一条从 g 到 gs 的弧.本文所指的群均为至少有三个元的有限群,其特征集 M 均不含单位元.有限集 E 的元的个数记为|E|.令 T=[t_1,t_2,…,t_r](表示序列),n 为正整数,n 个 T 排成的序列记为 n*T.例如,T=[t_1,t_2],2*T=[t_1,t_2,t_1,t_2].