基于Web技术的网络拓扑图生成方法的研究

综合采用提取路由表和地址转发表的方法，对网络逻辑拓扑结构和物理拓扑结构进行自动探索，提出了用于优化显示网络拓扑图的一种显示算法，采用Java技术实现了基于Web的网络拓扑图，并对在实现过程中遇到的问题进行了探讨。试验结果表明，由此生成的网络拓扑图准确、美观、能够实现跨平台和跨区域的管理。     

Strong coupling constants of light pseudoscalar mesons with heavy baryons in QCD

We calculate the strong coupling constants of light pseudoscalar mesons with heavy baryons within the light cone QCD sum rules method. It is shown that sextet–sextet, sextet–antitriplet and antitriplet–antitriplet transitions are described by one universal invariant function for each class. A comparison of our results on the coupling constants with the predictions existing in literature is also presented.     

Adaptive hierarchic transformations for dynamically p-enriched slope-limiting over discontinuous Galerkin systems of generalized equations

We study a family of generalized slope limiters in two dimensions for Runge–Kutta discontinuous Galerkin (RKDG) solutions of advection-diffusion systems. We analyze the numerical behavior of these limiters applied to a pair of model problems, comparing the error of the approximate solutions, and discuss each limiter’s advantages and disadvantages. We then introduce a series of coupled p-enrichment schemes that may be used as standalone dynamic p-enrichment strategies, or may be augmented via any in the family of variable-in-p slope limiters presented.     

Optical spectra of organic quantum dots in the strong coupling regime

We analyze the emission spectrum of a single organic quantum dot coupled to a microcavity in the strong coupling regime. We take into account non-linearities arising from both exciton–exciton interactions and the Pauli exclusion principle. We apply the recently developed Pade approximation for regular truncation of Green functions to calculate the emission spectrum. We show that as the number of excitations in the quantum dot increases the Rabi doublet evolves into a more complicated triplet structure.     

Hydrogenic impurity in a quantum dot: Comparison between the variational and strong perturbation methods

A comparison is given between the variational and strong perturbation techniques. It has been shown that the variational method gives, in general, better results. Also, a new formulation is presented for the strong perturbation technique that depends on a simpler equivalent form of the perturbed part of the Hamiltonian. Moreover, common expressions which are valid for both treatments have been obtained. The results are applied to calculate the binding energy for a hydrogenic impurity placed in a finite confining potential spherical quantum dot in the states (1s), (2p) and (2s). The results obtained hitherto for a central impurity by using the strong perturbation technique are deduced in a much simpler way. As regards the off-central impurity some new expressions have been derived in both treatments. The numerical results for the two states (1s) and (2p) have also been investigated.     

QSAR studies on estrogen receptor binding affinity of 2-phenylindoles using first-order valence molecular connectivity

The estrogen receptor binding affinity of 2-phenylindoles is found to be significantly correlated with Kier’s first-order valence molecular connectivity index. The correlation equations obtained provide a much simple rationale to design more potent compounds and help in predicting the potency of new compounds.     

Polariton emission in GaN microcavities

We present a detailed experimental study aimed at demonstrating the polariton nature of the photoluminescence emission in a bulk GaN microcavity grown on (111) silicon. The comparison of the photoluminescence with coincident reflectivity measurements at different temperatures shows an anticrossing behaviour with a Rabi splitting of the order of 35 meV up to room temperature. Relevant confirmations of the mixing between excitons and photons are found in the analysis of the spectral linewidth and of the time resolved kinetics.     

Analysis of longitudinal multispin orders in strongly coupled spin systems

Longitudinal multispin orders provide an effective way for measurement of scalar couplings and also to probe molecular interactions and dynamics. Analysis of longitudinal orders has been made in strongly coupled AB and ABX spin systems to determine the dependence of strong coupling parameter on these orders. Experimental and simulated spectra of various longitudinal orders are illustrated for these spin systems. This general procedure can be extended to broad range of spin systems to understand the influence of strong coupling on longitudinal orders.