复合低温相变蓄冷材料的实验研究

提出自行研制的一种复合低温相变蓄冷材料,通过实验分析了该蓄冷材料的融点、相变潜热和凝固融化过程曲线.该材料由有机物和无机物混合而成,用示差扫描量热仪(DSC)来测定该蓄冷材料的融点、相变潜热;用低温冰箱测试凝固融化过程材料的均匀稳定性.实验结果表明,该材料具有良好的性能,适用于医药、食品、冰箱及冷库等蓄冷装置中.     

基于压电阻抗的结构缺陷评价方法的实验研究

介绍基于压电动态阻抗的结构健康诊断新技术. 在阐述其基本原理的基础上,用压电陶瓷作为驱动源产生的动态阻抗信息,从实验的角度定性评价几种结构缺陷,证实该方法的可行性.     

On the post-buckling analysis of plastic structures under impulsive loading

An analytical method is suggested to analyze the plastic post-buckling behavior under impulsive loading. The fundamental equation of motion of a cylindrical shell is taken as an example to explain the main concept and procedure. The axial and the radial displacements are decoupled by an approximate scheme, so that only one non-linear equation for the radial buckling displacement is to be solved. By expanding it in terms of an amplitude measure as a time variable, we may get the post-buckling behavior in the form of a series solution. The post-buckling behavior of a rectangular plate used as a special case of cylindrical shell is discussed.     

煤大分子结构的电子自旋共振谱表征

应用ＥＳＲ技术对一变质系列煤的自由基特性进行了实验研究，探讨了煤中自由基的起源、性质和数量的变化，并将其与煤的大分子结构相关联。结果表明，煤自由基特性在煤化过程中的规律性较好。     

Resonance Rayleigh scattering spectrum for the chelate of lanthanum(Ⅲ) with sodium tanshinon ⅡA silate and its analytical application

In a pH 3.6―5.0 HAc-NaAc buffer solution, when sodium tanshinon ⅡA silate (STSⅡA) reacts with La(Ⅲ) to form a chelate, the resonance Rayleigh scattering (RRS) intensity can be en-hanced greatly and a new RRS spectrum will appear. The maximum RRS peak is located at 306 nm and the RRS intensity is proportional to the concentration of STSⅡA in a certain range. The method is very sensitive and the detection limit for STSⅡA (3σ/K) is 82.12 ng·mL?1. The optimum reaction condi-tions and the effect of coexisting substances have been investigated. A new, simple and fast method for the determination of STSⅡA based on RRS method is developed. It can be applied to the deter-mination of STSⅡA in the synthesis samples and Nuoxinkang injection. Combined with infrared ab-sorption and NMR spectra, the structure of the chelate and the reasons of RRS enhancement are also discussed.     

原子外层轨道能级与电子的电离顺序

本文根据光谱实验结果和量子数意义,归纳出一个n、1规则:E=n+1-(1-0.75)/(1+1)。n为主量子数,l为角量子数。计算的E值大小,可用来判别原子外层轨道能级高低顺序,确定原子核外电子的电离顺序,预测新的元素周期等。     

银电极表面氧化物的形成与转变

金属银是碱性电池的重要电极材料,人们已对它在碱性水溶液中的电化学反应进行广泛的研究,但其阳极氧化过程的分析以及氧化产物的鉴定至今仍是众说不一。为此,本文采用现场电化学X-射线衍射技术并配合循环伏安实验进行了研究。现场X-射线衍射实验在一个特制的有机玻璃电解池中进行。整个电解池系统犹如普通粉末样品架一样安放干衍射仪的样品台上,其中透射X-射线的窗片为聚酯薄膜。研究电极是将15×10×2mm~3的银片(纯度为99.99%)用环氧树脂灌封而成,并使用饱和甘汞电极     

Study on Synthesis and Intercalation Behavior of Layered Zirconium Proline-N-methylphosphonate-phosphate

Zirconium proline-N-methylphosphonate-phosphate (α-ZPMPP) was prepared in the presence of HF for the first time. The α-ZPMPP sample is highly crystallized with interlayer distance of 1.52nm. The interlayer distance of complex of α-ZPMPP with n-butylamine (α-ZPMPP-BA) is in 0.45 nm larger than that of α-ZPMPP. The α-ZPMPP possesses different intercalation behavior of host-guest compound from α-ZP.     

Theoretical study of bifurcated bent blue-shifted hydrogen bonds CH_2…Y

Ab initio quantum chemistry methods were applied to study the bifurcated bent hydrogen bonds Y… H2CZ (Z = O, S, Se) and Y…H2CZ2 (Z = F, Cl, Br) (Y = Cl-, Br-) at the MP2/6-311 G(d,p) and MP2/6-311 G(2df,2p) levels. The results show that in each complex there are two equivalent blue-shifted H-bonds Y…H—C, and that the interaction energies and blue shifts are large, the energy of each Y…H—C H-bond is 15-27 kJ/mol, and Δr(CH) = -0.1 - -0.5 pm and Δv(CH) = 30 - 80 cm-1. The natural bond orbital analysis shows that these blue-shifted H-bonds are caused by three factors: large rehybridization; small direct intermolecular hyperconjugation and larger indirect intermolecular hy- perconjugation; large decrease of intramolecular hyperconjugation. The topological analysis of elec- tron density shows that in each complex there are three intermolecular critical points: there is one bond critical point between the acceptor atom Y and each hydrogen, and there is a ring critical point inside the tetragon YHCH, so these interactions are exactly H-bonding.     

高效液相色谱法快速,灵敏测定尿中3—甲基组氨酸含量

本文报道用柱前衍生高液相色谱法快速，灵敏地测定尿中３－甲基组氨酸（３ＭＨ）。采用含３０％乙腈的１０ｍｍｏｌ／Ｌ磷酸钠缓冲液（ｐＨ＝７．５）为流动相，等梯度洗脱，１０ｍｉｎ内即可分析一个样品；在２０－３０００ｐｍｏｌ范围内，３ＭＨ线性相关系数为０．９９８６，相对标准偏差为２．３％（批内）和４．５％（批间）；并测定了１０名正常人尿中的３ＭＨ含量。