Spatial Carrier Bi-frequency Fourier Transform Profilometry for the 3-D Shape Measurement of Object with Discontinuous Height Steps

The combination of shearing interferometer, Fourier-transform profilometry, phase unwrapping by lookup table method has resulted in a new and more powerful method of measuring surface profile. The technique permits the three-dimensional shape measurement of objects that have discontinuous height steps. Experimental results have demonstrated the validity of the principle.     

第1届亚洲物理奥林匹克竞赛力学实验题解答及分析

介绍第1届亚洲物理奥林匹克竞赛力学实验题及其解答,并分析了该实验题的设计思想、特点与要求.     

电化学发光猝灭法测定蜂胶中黄酮总效价

蜂胶具有抗菌、抑制病毒、调节机体免疫力、抵抗类毒素以及清除氧自由基等临床药理作用,其中所含有的黄酮化合物是一类重要的中药药效成分,可有效清除体内自由基。关于蜂胶中黄酮类化合物的测定迄今未见有理想的方法。文章在碘催化的鲁米诺电化学发光的基础上,利用黄酮化合物对碘自由基的清除作用,研究了一种电化学发光猝灭法测定蜂胶中黄酮总效价的分析方法,该方法简便快捷、灵敏度高,可望用于蜂胶产品的质量鉴定。     

一类小波的构造

给出基于自相似形定义于无界集的多元小波构造方法,利用此方法,可以构造非张量积形式的多元小波.     

流动相组成、浓度和pH对蛋白质在金属螯合柱上的保留特性的影响

 系统研究了流动相中盐的性质和浓度、溶液 pH以及竞争配体对蛋白质在金属螯合色谱中保留值的影响。导出了描述蛋白质在金属螯合色谱中保留特征的数学表达式 ,提出用洗脱强度指数ε表征盐溶液的洗脱能力。根据不同色谱条件下蛋白质的保留特性 ,发现蛋白质在金属螯合色谱中的保留是配位、静电和疏水的协同作用。对与蛋白质强结合的金属螯合柱 ,以配位作用为主 ,静电作用为辅 ;对弱结合的金属柱 ,以静电作用为主 ,配位作用为辅。在流动相中加入高浓度非成络盐 ,可增强蛋白质和固定相间的疏水作用。     

聚醚砜流变性能的研究

用锥板流变仪测试了分子量不同的国产聚醚砜（ＰＥＳ）样品的流变性能．结果表明ＰＥＳ具有剪切变稀的特性，所得的粘流活化能与文献报道的ＩＣＩ产品值相近．根据求得的零剪切粘度（η０）与分子量的关系推断样品的分子量已经接近临界分子量（ＭＣ），并利用转换因子αＩ＝η０Ｔ／η０（ＴＲ）绘制了样品的叠合曲线，得到较好的叠加效果，同时还求得了ＷＬＦ方程的两个经验常数Ｃ１和Ｃ２的数值．     

POLYMER BOUND PYRROLE COMPOUNDS–VI. PHOTOPHYSICAL PROPERTIES OF MONOMERIC MODELS FOR POLYSTYRENE-BOUND PORPHYRINS

Abstract— Several porphyrin esters used as models for polystyrene-bound porphyrins have been prepared and their excited states have been studied by laser flash photolysis, IR phosphorescence of singlet molecular oxygen, O₂(¹Δ_g), and steady-state fluorescence. The photophysical properties of the porphyrin esters in solution are affected by the presence of nitro group(s) in the chain. In this case, an important decrease in φ_f, φ_T and φ_δ (to ca 0.7–0.4 of the value for the parent dimethyl ester) is observed. This is mainly due to intramolecular electron-transfer quenching [by the nitro group(s)] of the first excited singlet state of the porphyrin. The thermodynamic feasibility of this deactivation pathway has been confirmed polarographically. Quenching of the porphyrin triplet state and of O₂(¹Δ_g) by the nitro groups is negligible. The present conclusions explain also the results obtained previously for the photooxidation of bilirubin sensitized by the parent insoluble polystyrene-bound porphyrins. In that case the photooxidation rates were correlated directly with the quantum yield of O₂(¹Δ_g) production by the sensitizer. The consequences of these results for the use of polystyrene-bound porphyrins in sensitized photooxidation processes are discussed.     

ADJACENCY PRESERVING MAPS ON THE SPACE OF SELF-ADJOINT OPERATORS

§1. Introduction and Statement of ResultsThe study of the geometry of matrices was initiated by Hua [11–18] in the middle oftwenty century. In this geometry, the points of the space are a certain kind of matricesof a given size (rectangular matrices, symmetric matrices, Hermitian matrices, etc.). Witheach such space of matrices, we associate a group of motions. The main problem is tocharacterize this group by a geometric invariant called adjacency (see [23]). Recently, someauthors have gen…     

Design,Synthesis and Properties of Novel C60-Crown Dyads by 1,3-Dipolar Cycloaddition

Based on the 1,3-dipolar cycloaddition of azomethine ylide generated in situ from aldehyde and sarcosine attached to C60,two novel benzo-15-crown-5/C60 dyads with a different linking chain in each were designed and synthesized in yields of 30％ and 38％,respectively.It was found that their UV-Vis absorption spectra could be regulated hypsochromically by metal ions complexed.The long and soft linking chain was favorable for cooperate interaction of crown ether unit and C60 unit.     

火炮用PCrMo钢激光熔覆MoS2润滑涂层摩擦学性能研究

PCrMo钢是导致火炮系统故障的磨损失效零部件主要材料.为了提高零部件的寿命,将固体润滑技术引入火炮抗磨减磨设计中.选取8 ～ 10 μm和3～5 μm两种粒度下二硫化钼作为固体润滑材料,采用激光熔覆工艺在PCrMo钢试样表面制备润滑涂层.通过对涂层宏观性能表征,发现粒度小的涂层熔覆厚度较好;采用扫描电镜和能谱仪分别对涂层表面、剖面微观形貌和化学成分进行分析,发现涂层表面有凹坑产生,且凹坑中氧的含量明显高于光滑表面;涂层剖面与基体结合处存在一定的缝隙,涂层元素与基体元素发生了熔渗.进一步开展的摩擦磨损试验表明:与PCrMo钢裸基材试样相比,两种粒度下润滑涂层试样摩擦系数和磨损量皆降低,磨损量分别为14.84％和42.01％,其中大粒度下涂层摩擦性能较优.二硫化钼润滑涂层起到了很好的润滑效果,可以作为火炮磨损零部件减磨的有效手段.