硫醇自组装膜的电化学表观有效厚度

应 用循 环 伏 安 及 交 流 阻 抗 技 术 研 究 了 １８ 烷 基 硫 醇 修 饰 的 金 电 极 在 不 同 浓 度 的 Ｋ３ Ｆｅ（ Ｃ Ｎ） ６／ Ｋ４ Ｆｅ（ Ｃ Ｎ） ６ 溶液中的 电化学 行为，测得 反应的 标准 反应 速率 常数 为～１ ０ － ６ ｃ ｍ ·ｓ － １ ，表观电子 传递系数 为 α＝ ０１５ ，β＝ ０２２ ．提 出自 组装 膜 的电 化学 表 观有 效 厚度 概 念 及计 算 方法 ，应用表观 有效厚 度可以定 量说明自 组装膜 的分子倒 伏或塌 陷的缺陷 程度．     

High-energy scattering in extra dimensions

We analyze the behavior of the high-energy scattering amplitude in the brane-world scenario in extra dimensions. We claim that in contrast to the popular opinion based on the Kaluza-Klein approach, the differential cross section does not increase with the energy but only changes slope near the compactification scale value and then decreases, as in the four-dimensional theory. As an example, we consider quark-antiquark scattering with a one-gluon exchange in the bulk. __________ Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 147, No. 1, pp. 103–112, April, 2006.     

Axial resonances in the open and hidden charm sectors

A SU(4) flavor symmetrical Lagrangian is constructed for the interaction of the pseudo-scalar mesons with the vector mesons. SU(4) symmetry is broken to SU(3) by suppression of terms in the Lagrangian where the interaction should be driven by charmed mesons. Chiral symmetry can be restored by setting this new SU(4) symmetry-breaking parameters to zero. Unitarization in coupled channels leads to the dynamical generation of resonances. Many known axial resonances can be identified including the new controversial X(3872) and the structure found recently by Belle around 3875MeV in the hidden charm sector. Also new resonances are predicted, some of them with exotic quantum numbers.     

两个丢番图方程y~2=nx(x~2±1)

本文利用Ljunggren,Cohn,Bennett和Walsh以及陈建华等人的结果,给出了两个丢番图方程正整数解的解数上界和有效算法.     

Some Aspects of Nuclear Structure in Relativistic Approach

The nucleon effective interaction in the nuclear medium is investigated in the framework of the DiracBrueckner-Hartree-Fock (DBHF) approach. A new decomposition of the Dirac structure of nucleon self-energy in the DBHF is adopted for asymmetric nuclear matter. The properties of finite nuclei are investigated with the nucleon effective interaction. The agreement with the experimental data is satisfactory. The relativistic microscopic optical potential in asymmetric nuclear matter is investigated in the DBHF approach. The proton scattering from nuclei is calculated and compared with the experimental data. A proper treatment of the resonant continuum for exotic nuclei is studied. The width effect of the resonant continuum on the pairing correlation is discussed. The quasiparticle relativistic random phase approximation based on the relativistic mean-field ground state in the response function formalism is also addressed.     

Formation of linear structures of Sr and Gd films on the Mo(1 1 2) and W(1 1 2) surfaces

At low coverages, alkaline earth and rare earth layers adsorbed on furrowed transition metal surfaces--such as W(1 1 2) and Mo(1 1 2)--tend to form commensurate linear structures built of monoatomic chains directed across the furrows. Presented Monte Carlo simulations provide insight into parameters of the long-range indirect interaction that, in competition with a dipole-dipole interaction, leads to formation of the linear structures. The most impressive result of the simulations is the revealed repulsive effective interaction between adjacent atoms in linear Sr chains on W(1 1 2) surface. In this case, formation of the linear chains is accomplished due to pronounced minima in the potential of indirect interaction along the surface furrows. This result predicts that a single Sr chain cannot exist on the W(1 1 2) surface.     

模型及其参数对确定K介子有效质量的影响

分别使用线性和非线性Walecka模型,讨论了重子标量密度ρS和矢量密度ρB的关系.运用相对论平均场理论给出了不同模型下ρ_S-ρ_B关系曲线.利用这些结果,分析了模型和参数组对核物质中K介子有效质量影响的大小,得到了不同参数组下K介子有效质量随核物质密度的变化关系曲线.同时计算了非对称核物质中K介子有效质量在不同模型和不同参数下的有效质量的曲线,并与对称核物质中的情况进行了比较.     

Effective-Mass Schrödinger Equation and Generation of Solvable Potentials

A one-dimensional Schrödinger equation with position-dependent effective mass in the kinetic-energy operator is studied in the framework of an so(2,1) algebra. New mass-deformed versions of Scarf II, Morse, and generalized Pöschl-Teller potentials are obtained. Consistency with the intertwining condition is pointed out.     

核介质对介子有效质量的影响

在密度相关的相对论平均场近似下,研究了核介质密度对σ,ω,ρ,π介子有效质量的影响并与线性Walecka模型、非线性Walecka模型及TW模型的计算相比较,结果表明不同模型参数下的介子有效质量的变化不会有太大的差别.在低密度区域内,介子有效质量随核物质密度的增大而减小,而在密度较高时,σ,π介子的有效质量随核物质密度的增大而增大,ω,ρ介子的有效质量随核物质密度的增大其减小趋于平缓.不对称系数α对介子有效质量的影响很小.在TM1参数中σ介子的非线性自相互作用项以及多体耦合项(σπ)²对于π介子有效质量的影响是重要的.     

球形开口空腔“实际”发射率的计算

球形开口空腔在辐射计量、辐射定标和激光能量测量等方面得到了广泛应用。当考虑辐射热交换时，实际的发射率是一个很重要的参数。由于辐射能在壁面进行了多次反射吸收，所以开口空腔系统吸收的能量要比相同尺寸和相同发射率的平板吸收的能量大。这种由于辐射在空腔内多次反射和吸收使表面吸收率和表面发射率都增大的现象称之为“空腔效应”。针对空腔效应，引入有效辐射和视在发射率概念，通过球形开口空腔的视在发射率简单计算了开口空腔的辐射热损失。