用自适应MG法,FMG法求解Helmholtz方程

本文针对Ｖ循环、Ｗ循环和多重网格法中最优光滑次数及循环体个数难以确定的缺点，以Ｈｅｌｍｈｏｌｔｚ方程为例给出自适应的多重网格算法和自适应的完全多重网格算法。     

Chiral planar waveguide for guiding single-mode backward wave

Single-mode backward wave is shown to be guided in a planar dielectric waveguide with a strong chiral core. The significant difference of such a waveguide from the traditional one is the guidance of single-mode backward wave, without using negative permittivity and/or negative permeability. In the design, we generalize the idea of total internal reflection to the chiral medium and make a numerical analysis on the reflection with oblique incidence. We deduce rigorously a general solution of incident wave on the boundary of two arbitrary chiral magneto-electric media. We observe that the impedance matching can eliminate the coupling between two eigenwaves in chiral media. With strong chiral core and the matched impedance with cladding, one eigenwave becomes a backward wave and can be guided without transferring to the other eigenwave. If a single-mode propagation condition is satisfied, we will get single-mode backward guided wave. A special interface has been designed to prevent the forward wave entering the waveguide from the source.     

SrTiO3金属-绝缘体-半导体结构的介电与界面特性

采用金属有机分解法在p型Si衬底上制备了SrTiO3（STO）薄膜.研究了STO薄膜金属 绝缘体 半导体(MIS)结构的介电和界面特性.结果表明，STO薄膜显示出优异的介电性能，在10kHz处的介电常数约为105，损耗低于001，这来源于多晶结构和良好的结晶性；MIS结构中的固定电荷密度Nf和界面态密度Dit分别约为15×1012cm-2和(14—35)×1012cm-2eV-1，这主要与Si/STO界面处形成的低介电常数界面层有关. 关键词： SrTiO3薄膜 MIS结构 介电性能 Si/STO界面     

三元乙丙橡胶的13C-NMR定量分析

用13C核磁共振波谱法对三元乙丙橡胶进行了研究，通过图谱中各个峰的积分值，并用特定的计算公式测定了三元乙丙橡胶中乙烯及第三单体乙叉降冰片烯的含量，为红外光谱批量的定量分析建立了基准化的标定。     

有限元Ritz-Volterra投影的超收敛性质及其应用

本文研究有限元Ritz－Volterra投影的超收敛性质．利用一种新型的Green函数，证明了该投影具有与有限元Ritz投影相平行的函数和导数逼近的超收敛性质．这些结果被应用于抛物型积分微分方程和Sobolev方程的半离散有限元近似．     

Two novel molybdenum complexes containing [Mo2O2S2]2+ fragment: synthesis,crystal structures and catalytic studies

Mo₂O₂S₂(HGly)(Gly)₂ 1 and K₆[Mo₂O₂S₂(nta)₂][Mo₂O₂S₂(ntaH)₂]^·4H₂O 2 were synthesized by the reactions of (NH₄)₂MoS₄ and amino acids L (L = glycine, nitrilotriacetic acid) in ethanol–water medium at ambient temperature. The two complexes were characterized by elemental analysis, infrared spectra, UV–visible spectra, TG–DTA and XPS. X‐ray crystallographic structural analyses revealed that compound 1 is a binuclear Mo? S? glycinate complex, a glycinate ligand is coordinated to each molybdenum atom through its amine nitrogen and carboxylato oxygen, respectively, and the third glycinate acts as a bridge through its two carboxylato oxygens linking the two molybdenum atoms. Compound 2 is also a binuclear Mo? S complex with two nitrilotriacetate ligands, each of which is coordinated to a molybdenum atom via its two β‐carboxylato oxygens and a nitrogen atom. Simultaneously, each molybdenum atom in 1 and 2 is chelated to a terminal oxygen and two bridging sulfurs to complete the octahedral configuration. Their catalytic activities in the reduction from C₂H₂ to C₂H₄ as well as other binuclear Mo? S? polycarboxylate complexes, a [Fe₄S₄] single cubane and a chainlike Mo? Fe? S compound were investigated and it was found that 1 exhibited relatively good catalytic activity. Copyright © 2007 John Wiley & Sons, Ltd.     

Stokes型积分——微分方程的Galerkin近似

本文讨论一类具有Stokes方程结构的积分一微分方程的Galerkin近似，论证了近似解的存在唯一性，并分别导出速度和压力近似解的最优阶L_2模误差估计。     

Adsorption of Benzene on the Potassium Exchanged Hbeta Zeolites

ＡｄｓｏｒｐｔｉｏｎｏｆＢｅｎｚｅｎｅｏｎｔｈｅＰｏｔａｓｓｉｕｍＥｘｃｈａｎｇｅｄＨｂｅｔａＺｅｏｌｉｔｅｓＳＨＥＮＪｉａｎ－ｐｉｎｇ；ＭＡＪｕｎ；ＳＵＮＴｉｅａｎｄＪＩＡＮＧＤａ－ｚｈｅｎ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＪｉｌｉｎＵ...     

Effect of substituent groups of porphyrins on the electroluminescent properties of porphyrin‐doped OLED devices

Six tetraphenylporphyrins (TRPPH₂) with different horizontal substituents R (R = H, CH₃, OH, F, Cl, Br) were synthesized, and the organic light‐emitting diode (OLED) devices with a general configuration of ITO/TPD/Alq₃:2%TRPPH₂/Alq₃/Al were prepared. The substituted TRPPH₂ was used as the host dopant, 4,4‐bis‐(m‐tolyphenylamino)biphenyl (TPD) was used as a hole‐transporting material, and aluminum tris(8‐quinolinolato) (Alq₃) was used as an electron‐transporting material. The electroluminescent (EL) properties of these devices were studied to understand the light emitting properties of the substituted TRPPH₂. Previous studies have found that the color emitted by the devices was dependent on the TRPPH₂ dye concentration. The electronic effect of the horizontal substituents R of TRPPH₂ influenced the turn‐on voltage, brightness, and power efficiency of the devices. Also, the electroluminescence performance of the porphyrin‐doped OLED devices depended on the effectual overlaps between the emission of electron‐transporting material and the absorption of the dopants. This means that it is possible to evaluate the electroluminescence performance of the porphyrin‐doped OLED devices based on the emission of electron‐transporting material and the absorption of the dopants. Copyright © 2009 John Wiley & Sons, Ltd.