INTERACTING BOSON MODEL FOR ROTATIONAL STATES OF NEGATIVE PARITY

In this paper, rotation of the system consiting of N—1 (sd) bosons and one (pf)boson is discussed on the assumption that the SU(3) limit is just the rotational limit.Using group-theoretical methods, we have given rotational spectra of negative parity,and have derived the analytic expressions of the reduced matrix elements of the E3transition from the v₀-band (K^π=0^-) to the ground band. In terms of the inegualityof the intensities of (sd)-(sd). interaction and (sd)-(pf) interaction, the differencebetween the parmeters of positive-parity bands and those of negative-parity bands areexplained qualitatively.     

HIGH-ORDER CRANKING CALCULATION IN THE INTERACTING BOSON MODEL AND INTERACTING BOSONFERMION MODEL

Considering that the IBM and IBFM cranking calculations in the lowest order of angular frequency can give reasonably good estimates for the moment of inertia,we extend them to study the dependence of the moment of inertia on the higher order terms.We find that the analytic expressions for the correction terms can be derived.Numerical calculations for ¹⁵⁴Gd and ¹⁶¹Er are performed and compared with experiment.The Hamiltonian is taken from a microscopic approach.Calculated results show that the properties of higher order terms depend on the deformation of rotating system but the correction yields only limited effect when ω is small.     

COMPARISON BETWEEN THE BOHR-MOTTELSON MODEL AND THE INTERACTING BOSON MODEL

The comparison between BMM and IBM is comprehensively discussed in the spirit of the transformation theory by using the generator coordinate method (GCM). Some differences existed between these two essentially equivalent models are pointed out on the phenomenological level, and the possibility of distinguishing them is briefly discussed.     

A GENERALIZATION OF THE Q.Q HAMILTONIAN FOR THE INTERACTING BOSON MODEL

A simple Interacting Boson Model Hamiltonian involving only Q.Q and L.L terms is used to describe the Inversion of the β- and γ- bands in the rare earths. The model is used to describe this band inversion in the Hafnium isotopes.An inttrpreta-tion of this simple Hamiltonian in terms of the dynamical groups U(5),SU(3) and O(6) is presented.     

REALIZATION OF THE EMBEDDING OF LIESUBAL GEBRA IN THE CASE OF INTERACTING BOSON MODEL

This article treats the interacting Boson model (IBM-1) by the embeding theory of Lie subalgebra. From the considerations of stantard A₁ subagbra and the index relation of the embedding theory, we can get all the subagbra chains of IBM-1 model and prove that they exhaust the possible physically meaningful chains.
The Boson creation and annihilation operators are taken as basis for the realization of the embedding. In selecting the basis, angular momentum consideration is very crucial for the outcome of the correct physical result which has angular momentum as a good quantum number. Our results coincides with the original resul of Arima and Iachello.     

LOW-LYING SPECTRA AND E2 TRANSITION RATES IN EVEN--EVEN Pd ISOTOPES IN THE INTERACTING BOSON MODEL

The positive parity collective states in the even-even ¹⁰⁰Pd-¹¹⁶Pd isotopes are studied in the framework of the interacting boson model. A schematic Hamiltonian capable of describing their spectra and transition is used. It is found that the spectra can be well described by a U(5) plus SU(3) perturbation interaction. As the valence neutron number changes, the structure of the isotopes shows regular patterns of change. In the meantime, the behaviour of 0⁺₂ can also be partially described by the model.     

INTERACTING BOSON-FERMION MODEL AND

A model Hamiltonian of interacting Boson-Fermion system is given and this modelHamiltonian is solved with siniority v≤2. The calculation shows that the back-ben-ding phenomana can be well discribed.     

稠密多组元等离子体的二体关联函数与状态方程

本文分析电子-电子、电子-离子与离子-离子关联效应,得出多组元体系、双麦克斯韦稠密等离子体的状态方程。 关键词：     

稠密流体导热系数和粘度计算的新方程

根据热力学面上流体无量纲化剩余迁移性质曲线与对比密度曲线的相似性,通过关联无量纲化剩余导热系数和粘度与对比密度的方程,提出了一个推算卤代烃制冷工质稠密流体迁移性质状态方程。在常压下迁移性质计算的基础上,应用该方程只要已知物质的临界参数、分子量和偏心因子便可以计算稠密流体（气相或液相）的导热系数和粘度。该方法的提出使得迁移性质的计算像平衡性质一样通过状态方程便可以求出。与实验数据比较,本方法计算导热系数的总平均偏差为 4.8％,最大偏差为18.0％;计算粘度的总平均偏差为4.4％,最大偏差为 15.6％。     

STATISTICAL MODEL FOR A CHAOTIC SYSTEM OF TWO KINDS OF INTERACTING MODES

In this paper,a statistical model is proposed for a nonlinear system in which two kinds of interacting modes coexist. By using Direct Interaction Approximation, the simplified equations are derived for the correlation functions and the response functions in a randomcoupling model.     

THE INTERPLAY OF NUCLEAR DEFORMATION AND PAIR CORRELATION NUCLEAR PHASE DIAGRAM

Bringing together the gauge space into consideration,the sudden transition ofnuclear shape can be analyzed in association with that of pair correlation.Thus,notonly the dramatic retardation of the E2 transition rate at the backbending can be reasona-bly used as a criterion for establishing the shape transition,but also the interplay ofnuclear deformation and pair correlation can be clearly shown.     

INTERACTING BOSON MODEL FOR EVEN-EVEN NUCLEI POSSESSED OF 1+ AND 3+ BANDS IN THE ROTATIONAL RIGION

On the bases of s, d IBM, octupole states are taken into account and the two-quasiparticle excitation is treated as boson-like in the SU(3) limit. The energy spectra are obtained analytically and the nondegenerated 1⁺ and 3⁺ bands are also reproduced. The calculated spectra of eight nuclei, which possess with 1⁺ or 3⁺ bands in their energy spectra in the rotational rigion, agree with the experimental ones fairly good.     

一种新的生物医学用快速实时低相干显微成象原理

本文讨论了一种将共焦显微术与迈克耳逊干涉术相结合,并利用宽带低相干光源相干长度短的特点而形成的一种可对高密度非透明样品进行显微成象的方法,并将这种显微成象方法与共焦显微成象方法进行了比较,最后讨论了一种快速实时成象的原理,基于这种原理设计的仪器将为生物和医学工作者提供一种新的非侵入测量和诊断手段.     

INFLUENCE OF THE INTERFERENCE OF ODD AND EVEN WAVES ON SPATIAL CORRELATION OF NUCLEON PAIR

The effect of the interference of odd and even waves on the spatial correlation of a pair of valent nucleons has been investigated.     

转动原子核的对关联变化

利用粒子数守恒方法,在i=11/2壳中精确处理了推转壳模型和粒子转子模型。研究了转动原子核对关联随角动量的变化情况。且通过对上述两种模型给出的对关联、能谱,顺排角动量和seniority结构的分析和比较,还对推转壳模型的可靠性进行了估价。 关键词：     

较高杂质浓度磁性合金负磁阻的关联对模型

本文讨论在有外加磁场情况下,较高杂质浓度磁性合金中传导电子与关联对散射引起的电阻及磁阻随温度和磁场的变化,得到了Rohrer关于合金AuFe磁阻随杂质浓度变化的经验公式。 关键词：     

CPL蒸发器多孔芯传热传质特性的新数学模型

毛细循环泵(CPL),由于具有高热传输性能,目前已经成为大功率载荷的电子芯片排热系统的一个重要发展方向,尤其是在航空航天飞行器上。选择一种具有较大相变潜热的工质,例如甲醇, CPL可以传输相当大的热流。本文对CPL蒸发器多孔芯流动和传热的数值模拟提出了一个新的发展方向,就是在计算中加入非饱和模型数值计算。文中阐述了加入非饱和计算的三层模型对真实模拟蒸发器多孔芯流动和传热问题的重要性,并给出了应用新的三层模型所得到的初步计算结果。     

正庚烷化学动力学简化模型的构建及优化

提出了一个新的适用于HCCI发动机燃烧模拟的正庚烷化学反应动力学简化模型(40种组分和62个反应)。由三个子模型组成:低温反应子模型是在Li等人模型的基础上,定义具体的醛类(RCHO)产物和小分子碳氢产物(Rs)而构建;增加了用于链接低温反应向高温反应过渡的大分子直接裂解成小分子反应子模型;高温反应子模型是在Griffiths等人模型的基础上,去除了无关的基元反应,增加两个关于CO和CH3O的氧化反应而构建。另外,采用遗传优化技术对模型动力学参数进行调整。计算表明,新模型能够在当量比0．2-1．2,温度从300-3000 K的范围内精确模拟正庚烷HCCI燃烧时冷焰和热焰反应过程,与详细模型(544种组分和2446个反应)计算结果吻合较好。     

PNC METHOD FOR TREATING THE PAIRING CORRELATION IN SPHERICAL NUCLEUS

In this paper the particle-number-conserving method (PNC) for treating pairing correlations in deformed nucleus is extended to treat the spherical nucleus. The properties of the ground state and the lowlying 0⁺ states of even-even isotops nearby ²⁰⁸Pb are calculated with this method.