THE WAVE EQOATIONS FOR MESONS AND BARYONS IN THE STRATON MODEL

Quantum field theory is applied to meson states formed from a pair of straton and anti-straton, and also baryon states formed from three stratons according to the straton model. Two types of effective potential are also introduced which interact with the stratons through Dirac matrices γ₅ and γ₄ respectively. The rest mass of the stratons is assumed to be very heavy. The resulting wave equations give very satisfactory account of the mass spectra of the ground and excited states of various mesons and baryons.     

多元化与公司风险研究

文章研究了公司的系统风险、债务风险和经营风险与公司的多元化程度的相关性。本文的实证结果表明,公司的系统风险与公司的多元化程度是正相关的;公司的债务风险与公司的多元化程度是正相关的;公司的经营风险与公司的多元化程度是负相关的。随着公司多元化程度加深,公司的经营风险会变小,但是公司面临的宏观的资本市场的系统风险和企业自身的债务风险,会随着变大。     

Measurement of the First Hyperpolarizability of Rare Earth Compounds by Hyper-Rayleigh Scattering in Solution

The first hyperpolarizabilities βzzz of a hemicyanine chromophore dye and a new type chromophore, both containing rare earth complex anion, have been measured by Hyper-Rayleigh scattering in solution. The results showed that the nonlinear optical properties of these compounds have been improved by introducing the rare earth complex anion.     

热库中振子弛豫过程的精确解

本文从VonNeumanm方程出发,求出了热库中振子跃迁几率的精确解。在不作弱耦合近似情况下得到了平衡态分布的形式。 关键词：     

Information Entropy Squeezing for a Atom in Mode-Mode Competition System

The entropy squeezing properties for a two-level atom interacting with a two-mode field via two different competing transitions are investigated from a quantum information point of view. The influences of the initial state of the system and the relative coupling strength between the atom and the field on the atomic information entropy squeezing are discussed. Our results show that the squeezed direction and the frequency of the information entropy squeezing can be controlled by choosing the phase of the atom dipole and the relative competing strength of atom-field, respectively. We find that, under the same condition, no atomic variance squeezing is predicted from the HUR while optimal entropy squeezing is obtained from the EUR, so the quantum information entropy is a remarkable precision measure for the atomic squeezing in the considered system.     

橫觀各向同性弹性体的振动问题

-.引言 各向异性弹性体中平面波与表面波的传播虽经不少学者研究过,但是这类物体的一般振动问题却很少有人提起。本文的目的在于简化横观各向同性弹性体的振动问题的一般方程。採用与前文相同的方法,我们将位移用两个函数φ和F来表示,并且导得它们所适合的方程。φ可以用普通的波函数表示,但是在一般情况下F却不能用普通的波函数表示。     

Measurement of the KLL Dielectronic Recombination Resonances in He-like to C-like Kr Ions

The KLL dielectronic recombination processes of highly charged He-like to C-like Kr ions have been studied experimentally. The measurement was performed on the newly developed Shanghai electron beam ion trap （Shanghai-EBIT） facility. Characteristic x-rays from both dielectronic recombination and radiative recombination are detected as the electron beam energy is scanned through the resonances. The KLL resonant strengths obtained are 5.41×10^-19, 4.33×10^-19, 3.59×10^-19, 2.05×10^-19 and 0.98×10^-19 cm^2 eV for He-like to C-like Kr ions, respectively.     

亚音速轴流压气机转子非轴对称轮毂端壁的数值研究

修改端壁型线是减小二次流损失提高压气机性能的有效方法之一.本文针对某高亚音速压气机转子,首先利用三角函数造型法完成了非轴对称轮毂端壁造型,然后对带非轴对称端壁结构的轴流压气机内部流场进行了详细的数值模拟,数值计算所获得的总性能与试验结果符合较好,该非轴对称轮毂端壁结构的引入能使得压气机的峰值效率提高约0.3285%.详细分析了非轴对称端壁结构对压气机内部流场结构的影响,结果表明:非轴对称轮毂端壁结构的采用能够改善轮毂端壁附近载荷分布,有效地降低叶片通道的二次流流动,从而提高轴流压气机的性能.     

M-RNA碱基复合物(M=Ca+和Mg+)特征振动的密度泛函理论分析

采用密度函数理论的B3LYP交换关联能泛函在6-311+G(2df,2p)基组水平上,优化计算了Ca+,Mg+与RNA碱基嘧啶各同分异构体形成稳定复合物的结构,发现其中C1M,T1M和U1M(M=Ca+和Mg+)为最稳定复合物,并对这些复合物红外振动进行了计算.计算结果显示碱基嘧啶单体主要存在的两个红外特征振动,是由环振动和环外氧原子及与其成键的环上碳原子之间产生伸缩振动引起的.当形成复合物时,由于离子的参与,使单体碱基分子的振动情况发生了改变,主要表现在离子倾向于与环外负电子原子N和O原子成键,使与离子直接作用环外原子参与的特征振动频率减小,谱线红移;不与离子直接作用环外原子引起的特征振动频率增大,谱线蓝移.     

一类变论域自适应模糊控制器

目前常用的自适应模糊控制器存在控制精度不高和调整时间长等问题.变论域自适应模糊控制器能够显著提高控制精度并缩短其调整时间,但其控制效果对一组完备的初始模糊规则的依赖,限制了其应用的范围.针对上述问题,本文提出了一种推理规则前件论域可变,后件峰点自适应的自适应模糊控制器.Lyapnuov综合分析法证明新的控制器具有全局稳定性,并通过仿真实验表明,新控制器不仅能够提高控制精度,而且较为合理地回避了对初始模糊规则的依赖性,扩展了变论域模糊控制的适用范围.