光场横向效应导致CO2激光器混沌运转的实验研究

对横向效应导致单纵模多横模CO_2激光器失稳进行了实验研究.观测到了经各种途径到达的激光混沌态,并对其物理机制进行了探讨.     

A rapid screening procedure for 2-aminonaphthalene in natural,synthetic, and refined crudes

The mutagen, 2-aminonaphthalene, which is the dominant aromatic amine species in several fossil fuels, may be isolated readily by using a sequential high-performance liquid chromatographic procedure. An initial isolation is achieved on a semi-preparative scale aminosilane column and the final separation is completed with a nonpolar stationary phase column on an analytical scale with a pH-adjusted solvent. The use of fluorescence detection permits discrimination (at least 100-fold) against the nonmutagenic isomer, 1-aminonaphthalene. The overall recovery of 2-aminonaphthalene, as determined by scintillation counting of a radioactive 1-aminonaphthalene tracer, typically exceeds 50% and can reach 92% depending on both the sample matrix and the solubility of the isolate in acetonitrile. The minimum detectable quantity is 0.06 μg g^-1 of crude sample.     

cis-Dichloro {BIS-1-anti, 3-syn-(o-diphenylphosphino)phenyl-1-methallyl(1-3η) } rhodium(III): a chelate π-allylic complex formed by proton abstraction from an olefinic di-tertiary-phosphine)

The preparation, properties, and single crystal X-ray structure of the title complex,

are described.     

The Law of the Iterated Logarithm and Central Limit Theorem for L-Statistics

The Chung–Smirnov law of the iterated logarithm and the Finkelstein functional law of the iterated logarithm for empirical processes are used to establish new results on the central limit theorem, the law of the iterated logarithm, and the strong law of large numbers for L-statistics with certain bounded and smooth weight functions. These results are used to obtain necessary and sufficient conditions for almost sure convergence and for convergence in distribution of some well-known L-statistics and U-statistics, including Gini's mean difference statistic. A law of the logarithm for weighted sums of order statistics is also presented.     

Af型自由基均聚反应的固化理论(Ⅲ)──高分子凝胶网络缺陷

应用高分子反应统计理论,分析了高分子网络的形成过程,讨论了A_f型自由基均聚反应凝胶网络中的缺陷悬吊环的数目及其形成几率.     

Flow morphologies of two shock-accelerated unstable gas cylinders

Our highly reproducible shock-tube experiments examine the interaction of two unstable, compressible gas cylinders accelerated by a planar shock wave. Flow visualization shows that the evolution of the double-cylinder flow morphologies is dominated by two counter-rotating vortex pairs, the strength and behavior of which are observed to be highly sensitive to the initial cylinder separation. Simulations of the flow based on idealized vortex dynamics predict grossly different morphologies than those observed experimentally, suggesting that interactions at early time weaken the inner vortices. A correlation-based ensemble averaging procedure permits decomposition of the concentration field into mean and fluctuating components, providing evidence that energy is transferred from the intermediate to the small scales at late time.