高强度氟化物玻璃光纤的研制

以高纯无水的氟化物为芯玻璃原料,聚全氟乙丙烯塑料(TEFLON-FEP)为皮层,采用新的方法制备了ZrF_4-BaF_2-LaF_3-AlF_3-NaF(ZBLAN)氟化物玻璃光纤预制棒,并拉制出光纤,研究了工艺条件对光纤抗弯曲强度和光纤损耗的影响。研究结果表明,该方法对消除氟化物玻璃光纤中的微晶、气泡等缺陷,改进光纤表面及芯皮层界面状况是非常有效的,可明显地提高氟化物玻璃光纤的抗弯曲强度,降低光纤损耗,所制得的氟化物光纤的抗弯曲强度大于1100 MPa,光纤损耗低于0.25dB/m,该光纤已应用于某短程传输系统中。     

Influence Diagnostics in the Common Canonical Variates Model

As a generalization of the canonical correlation analysis to k random vectors, the common canonical variates model was recently proposed based on the assumption that the canonical variates have the same coefficients in all k sets of variables, and is applicable to many cases. In this article, we apply the local influence method in this model to study the impact of minor perturbations of data. The method is non-standard because of the restrictions imposed on the coefficients. Besides investigating the joint local influence of the observations, we also obtain the elliptical norm of the empirical influence function as a special case of local influence diagnostics. Based on the proposed diagnostics, we find that the results of common canonical variates analysis for the female water striders data set is largely affected by omitting just one single observation.     

Influence Analysis for Linear Measurement Error Models

In this paper, we present a unified diagnostic method for linear measurement error models based upon the corrected likelihood of Nakamura (1990, Biometrika, 77, 127–137). Both global influence and local influence are discussed. The case-deletion model and mean-shift outlier model are considered, and they are shown to be approximately equivalent. Several diagnostic measures are derived and discussed. It is found that they can be written in terms of the residual and leverage measure. Some existing results are improved. Numerical example illustrates that our method is useful for diagnosing influential observations.     

轴向有机配体对Schiff碱配合物模拟酶催化性能的影响

研究了13种轴向有机中性配体(咪唑、嘧啶、吡唑、吡嗪、哌啶、4-甲基吡啶、3-甲基吡啶、2-甲基吡啶、2,6-二甲基吡啶、三苯基膦、噻吩、呋喃、吡咯)对Schiff碱双锰配合物在模拟酶催化PhIO单加氧化环己烷反应中催化性能的影响。结果表明,这些轴向有机配体均能提高Schiff碱金属配合物的催化活性;一般轴向配体碱性愈强,催化剂的催化活性愈高。     

Heteroatom influence in substituted benzenes and pyridine-like heterocycles in terms of direct and indirect intramolecular interactions

The general expression for the one-electron density matrix obtained previously for saturated organic molecules (V. Gineityte, J. Mol. Struct. (Theochem), 343 (1995) 183) is shown to be applicable also to substituted benzenes and pyridine-like heterocycles. On this basis, a new interpretation of the influence of a heteroatom (substituent) upon the remaining fragment of an aromatic molecule is suggested. To this end, the occupation number of a 2p_z AO of the aromatic ring has been expressed as a sum of five terms, two of them describing the intramolecular charge transfer and the remaining ones representing the secondary (induced) dipole moments arising within the ring under the influence of heteroatom, viz. the so-called ipso–ortho (para–meta), para–ipso and ortho–meta dipole moments. Just the latter two moments proved to play the principal role in the formation of the observed picture of the electron density distribution, viz. of an increase (reduction) of occupation numbers of 2p_z AOs in the ortho and para positions after introducing an electron-donating (accepting) substituent. For pyridine-like heterocycles and substituted benzenes, these dipole moments are determined mostly by the direct and the indirect interactions, respectively, between the highest occupied and the lowest vacant MO of benzene. Orbitals of the heteroatom (substituent) play the role of mediators in the above-mentioned indirect interaction.     

Integral Representations for the Deflection and the Slope of a Plate on an Elastic Foundation

With the help of two fundamental solutions, integral representations for the deflection and the slope of polygonal shaped plates on an elastic foundation are derived. The kernel functions are evaluated in terms of zero-order Kelvin- or Thomson-functions and their derivatives, respectively. This revised version was published online in August 2006 with corrections to the Cover Date.     

影响废水排放因素的统计分析

蔡越江．影响废水排放因素的统计分析．本文通过定量分析人口数量、能源消费、生活水平、能源水平和废水治理水平等因素对废水排放的直接和间接影响,以及这些因素之间的相互影响和相互作用,结果表明人口数量和工业生产是影响废水排放的重要因素,提高生产率和能源利用率能有效减少废水的排放     

压缩真空态下介观耦合电路的量子涨落及电源对量子涨落的影响

通过对无耗耦合含源介观电路的量子化和哈密顿量的对角化,求出了耦合电路的能谱,研究了压缩真空态下介观电路中电荷、电流的量子涨落和电源对量子涨落的影响。     

化学气相沉积法制备二维过渡金属硫族化合物研究进展

二维过渡金属硫族化合物(TMDs)是继石墨烯之后的新型二维材料,由于其自身的独特物理化学性质在半导体、光电材料、能源储存和催化制氢等方面备受瞩目。化学气相沉积(CVD)是目前适合实现大规模制备二维材料的工艺之一,制备过程中参数的高度可控性使其具有很大优势。本文综述了近期通过CVD制备TMDs的研究进展,探讨了在CVD制备工艺中各种参数对产物生长和最终形貌的影响,包括前驱体、温度、衬底、辅助剂、压力和载气流量等。列举了一些改进的CVD制备工艺,并对其特点进行了总结。最后讨论了目前CVD制备TMDs所面临的挑战并对其发展前景进行展望。     

分子印迹聚合物吸附性能的影响因素探讨

分子印迹聚合物具有对特定分子的亲和性和高选择性,稳定性好、使用寿命长、应用范围广等特点,因此在很多领域,如色谱分离[1]、固相萃取[2]、仿生传感[3]、模拟酶催化[4]、临床药物分析[5]、膜分离[6]等得到日益广泛的研究和应用。影响分子印迹聚合物与模板分子之间识别作用的因