Difference of Directions Between External Driving Force and Movement Direction of Center of Mass

Driven dynamics of a two-dimensional Frenkel-Kontorova model is studied in the paper. In our numerical simulations, it is found that the movement direction of the center of mass is not consistent with that of the external driving force except for some special symmetric directions at the lower driving force. Our results also indicate that the movement direction of the center of mass strongly depends on both the magnitude and the direction of the external driving force as well as the misfit angle between two layers.     

弗兰克-赫兹实验中吸收峰形成与变化判断准则的研究

以汞原子第一激发电势为例,系统地研究了吸收峰的形成条件,进而导出了吸收峰形成与变化的判断准则,并利用这一准则成功地解释了吸收曲线常成橄榄形的原因。     

弗兰克-赫兹实验中温度与电子平均自由程的关系

运用原子非弹性碰撞模型来测量F-H曲线峰谷间距随峰谷数的线性关系,研究温度对电子平均自由程的影响,并尝试探讨一种较为准确的测量原子第一激发能的实验方法.     

频谱分析方法在弗兰克-赫兹实验中的应用

弗兰克-赫兹实验中定态能级间隔具有很强的周期性.本文借鉴频谱分析的方法,对弗兰克-赫兹实验数据进行处理,结果显示该方法准确确定出了定态能级间隔,结果有着很强的直观性及良好的处理效果.     

Dislocation Dissociation Strongly Influences on Frank-Read Source Nucleation and Microplasticy of Materials with Low Stacking Fault Energy

The influence of dislocation dissociation on the evolution of Frank-Read （F-R） sources is studied using a three- dimensional discrete dislocation dynamics simulation （3D-DDD）. The classical Orowan nucleation stress and recently proposed Benzerga nucleation time models for F-R sources are improved. This work shows that it is necessary to introduce the dislocation dissociation scheme into 3D-DDD simulation, especially for simulations on micro-plasticity of small sized materials with low stacking fault energy.     

一株木麻黄弗兰克氏菌的细胞化学组分

采用薄层层析和氨基酸分析仪检测了细枝木麻黄弗兰克氏菌菌株Ｃｃ０１的细胞化学组分．表明它的全细胞特征性糖为木糖和半乳糖；细胞壁氨基酸组分在薄层上只显示有赖氨酸．而无ｍｅｓｏ－ＤＡＰ和甘氨酸；但在氨基酸分析仪上除含有谷氨酸（ＧＬＵ）、甘氨酸（ＧＬＹ）、丙氨酸（ＡＬＡ）和二氨基庚二酸（ＤＡＰ）以外，尚有较高含量的天冬氨酸（ＡＳＰ）和赖氨酸（ＬＹＳ）．由这些氨基酸的分子比得出，菌株Ｃｃ０１与胞壁Ⅱ型和Ⅲ型的参考菌株均明显不同，其特征性氨基酸分子比为Ｇｌｕ∶Ｇｌｙ∶Ａｌａ∶Ｄａｐ∶Ａｓｐ∶Ｌｙｓ为１．００∶０．１３∶３．５０∶０．２１∶０．５３∶０．７８，其ＤＡＰ含量仅为Ⅲ型菌株的１／６．表明Ｃｃ０１的胞壁类型和其它弗兰克氏菌不一样，是一种特殊类型．     

On the classification of positive quaternionic Kähler manifolds with b 4 = 1

Let M be a positive quaternionic Kahler manifold of dimension 4m. We already showed that if the symmetry rank is greater than or equal to [m/2] ＋ 2 and the fourth Betti number b4 is equal to one, then M is isometric to HPm. The goal of this paper is to report that we can improve the lower bound of the symmetry rank by one for higher even-dimensional positive quaternionic Kahler manifolds. Namely, it is shown in this paper that if the symmetry rank of M with b4（M） = 1 is greater than or equal to m/2 ＋ 1 for m ≥ 10, then M is isometric to HPm. One of the main strategies of this paper is to apply a more delicate argument of Frankel type to positive quaternionic Kahler manifolds with certain symmetry rank.     

AsH+离子的电子结构和跃迁性质

采用多参考组态相互作用方法计算了AsH⁺离子前3个离解极限所对应的8个电子态(X²Π,a⁴Σ^-,A²Σ^-,b⁴Π,B²Δ,C²Σ⁺,D²Π,2²Σ⁺)的电子结构.As原子选择了aug-cc-pwCV5Z-PP相对论赝势基组.在计算中考虑了Davidson修正,芯-价电子关联和自旋-轨道耦合效应.拟合得到了所有态的光谱常数,离解能越大的电子态,其谐振频率越大,平衡核间距越小.考虑自旋-轨道耦合效应后,由于避免交叉,B²Δ_3/2和B²Δ_5/2变为双势阱结构.最后预测了A²Σ^-→X²Π,a⁴Σ_1/2^-     

Franck--Condon factors and r-Centroids for the A 1∑+u-X1∑+g Band System of 107,109Ag2: Comparison of the Observed and Calculated Absorption Band Strengths

Franck-Condon factors and r-centrolds for the, A^1 ∑^＋ u-X^1∑^＋ 9 band system of ^107,109Ag2 are computed using Morse and Rydberg-Klein-Rees potentials for both lower and upper electronic states. The differences between the two sets of results are typically in the third decimal place for transitions involving vibrational levels with ν＇ and ν＂ up to about 15. Somewhat larger deviations appear for higher vibrational levels, but both sets of results follow the same pattern, which is to match well with the relative absorption band strength distribution in our experimental spectrum. The relative absorption band strengths are calculated by assuming that the electronic transition moment has only a weak dependence on the internuclear distance r. Good agreement between our measured and calculated absorption band strength ratios is found, which provides an excellent test of the calculated Franck- Condon factors and relative absorption band strengths. The r-centrold value for the （ν＇ = 0, ν＂ = 0） band is found to be approximately equal to the average value of r＇ and r＇＇e , indicating that the potentials of both states are not significantly aaharmonic around their minimum regions.     

弗兰克—赫兹实验中的峰间距问题

运用吸收峰形成与变化判断准则解释了管温和阴－栅极距离对峰间距的影响。