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1·The density matrix and the entropy are calculated.

计算了密度矩阵、配分函数和熵。

2·In this paper the method of density matrix is used to describe two coupled modes.

采用密度矩阵方法描述了两模反向耦合。

3·A method calculating one body density matrix of nucleus in the mean field shell model is proposed.

提出平均场壳模型下原子核单体密度矩阵的一种计算方法，验证该方法的可靠性。

4·The spectrum density matrix of the proposed model was constructed and its properties are investigated.

在此基础上进行了谱分析，得到了该模型的谱密度、互谱密度和双互谱密度。

5·Using the density matrix theory describes the absorption and dispersion properties of the detecting light.

用密度矩阵理论描述了系统对探测光的吸收和色散性质。

6·The method of density matrix renormalization-group is applied to obtain logarithmic behavior of the entropy.

我们利用密度矩阵重整化群方法来研究熵的对数行为。

7·On the basis of force density matrix of cable element, a force density matrix of triangle membrane element is introduced.

本文在已有的索单元力密度矩阵的基础上推导了三角形膜单元的力密度矩阵。

8·By using the method of density matrix renormalization group, the ground state entanglement in different systems is studied.

通过密度矩阵重整化群的方法，我们研究了不同系统中的基态纠缠。

9·In some cases, however, the quantitatively ac-curate results necessitate the density matrix theory and the semiclassical model.

但在一些场合下，取半经典和密度矩阵模型对进行定量的计算是十分必要的。

10·The equation of three step photoionization for describing the field and the density matrix as well as the atomic population was derived.

推导了三步光电离的场方程组和原子布居的密度矩阵方程组。