变温过程中二甲基亚砜与水之间氢键行为的拉曼光谱研究

测量了在降温过程中体积比为1∶1的二甲基亚砜(DMSO)水溶液的拉曼光谱,并对DMSO水溶液的拉曼光谱进行了归属。对实验数据进行分析发现: 在降温过程中DMSO分子与水分子的分子间氢键、DMSO分子与DMSO分子和水分子与水分子间氢键的作用行为引起了DMSO的SO双键和水分子的O—H键的拉曼谱带的变化。进一步分析表明：在27～-30 ℃降温过程DMSO与水之间氢键加强,-30～-60 ℃降温过程水与水之间氢键代替DMSO与水之间的氢键。这为丰富水溶液的氢键理论提供了实验依据。     

Influence of the ordered structure of short-chain polymer molecule all-trans-β-carotene on Raman scattering cross section in liquid

We measured the resonant Raman spectra of all-trans-β-carotene in solvents with different densities and concentrations at different temperatures.The results demonstrated that the Raman scattering cross section(RSCS) of short-chain polymer all-trans-β-carotene is extremely high in liquid.Resonance and strong coherent weakly damped CC bond vibrating properties play important roles under these conditions.Coherent weakly damped CC bond vibration strength is associated with molecular ordered structure.All-trans-β-carotene has highly ordered structure and strong coherent weakly damped CC bond vibrating properties,which lead to large RSCS in the solvent with large density and low concentration at low temperature.     

关于作图法有效数字的一些讨论

在物理实验中,常常用拟合直线的方法求出某些待测物理量的数值.拟合直线的诸方法中,作图法和最小二乘法都是被普遍采用的.众所周知,在诸方法中,最小二乘法拟合的直线的不确定度是最小的.由于其所求得的物理量误差最小,物理量的有效数字位     

Land/groove optical recording with GeTe/Sb2Te3 superlattice-like structure

A superlattice-like (SLL) structure was applied to phase-change optical recording. The recording layer consisting of alternating thin layers of two different phase-change materials, GeTe and Sb2Te3, were grown by magnetron sputtering on polycarbonate substrates. Land/groove optical recording was adopted to suppress crosstalk and obtain a large track density. Dynamic properties of the SLL disc were investigated with the shortest 1T pulse duration of 8 ns. Clear eye pattern was observed after 10000 direct overwrite cycles. Erasability above 20 dB was achieved at a constant linear velocity of 19 m/s. Carrier-noise ratio (CNR) kept above 46 dB when the recording frequency reaches 21 VIHz. The SLL phase change optical disc demonstrates a better recording performance than the Ge1Sb2Te4 and Ge1Sb4Te7 discs in terms of CNR, erasability, and overwrite jitter.     

介绍晶須——发展高强度結构材料的可能途径之一

实际使用的固体材料(晶体)虽然基本上具有理想晶体的周期性的点阵結构,但同时却往往存在一些缺陷(偏离理想的点陣結构)。这些缺陷可分为点的、綫的和面的三种。通常称线缺陷为位錯。由于缺陷特別是位錯的存在及其在应力作用下的移动,使得实际固体的强度比对理想情形的計算值小很多(可以小到几百倍以上)。为提高实际固体的强度,现在一般采用的方法是使位錯不能移动或需在較高的应力下才能移动。这可通过增加固体中的位錯数目使     

基于比较运算的广义反演律与广义对偶定理

本文首先提出运算反演的概念，并在应用比较运算综合函数的前提下讨论了诸比较运算的反演关系，由此建立了广义摩根定律、广义香农定律与广义对偶定理。如果限于使用取小（与）和取大（或）二种比较运算，则以上定律便回归到传统的表达形式。     

C59（C6H4OCH3）N的结构,光谱和二阶非线性光学性质的理？…

用ＩＮＤＯ系列方法对由（Ｃ５９Ｎ）２和苯甲醚合成的衍生物Ｃ５９（Ｃ６Ｈ４ＯＣＨ３）Ｎ进行了理论研究,得到了分子的稳定构型。结果表明,Ｃ５９（Ｃ６Ｈ４ＯＣＨ３）Ｎ具有Ｃｓ对称性,以优化构型为基础讨论了分子的ＵＶ－Ｖｉｓ光谱、ＮＭＲ谱线数,结果与实验符合得很好,本文还计算了Ｃ５９（Ｃ６Ｈ４ＯＣＨ３）Ｎ的二阶非线性光学系数βμ,结果表明这种物质具有较大的二阶非线性光学系数。     

河南烤烟精油化学成分的研究

本文论述了采用毛细管气相色谱-质谱法研究河南烤烟精油的化学成分。质谱鉴定了45种化合物。烤烟精油中的主要成分有尼古丁,新植二烯,2,6,11-西柏三烯-4,8-二醇,茄酮,β-大马烯酮和巨豆三烯酮等。