片语

density matrix renormalization groupThe density matrix renormalization group (DMRG) is a numerical variational technique devised to obtain the low energy physics of quantum many-body systems with high accuracy. It was invented in 1992 by Steven R.

density intergrowth matrix灰度共生矩阵

correlation density-matrix关联密度矩阵

low density generator matrix低密度生成矩阵

density of field场强，场强密度；密度矩阵

density-matrix equations密度矩阵方程

compact density-matrix紧致密度矩阵

many-body correlation density-matrix多体关联密度矩阵

spin density matrix自旋密度矩阵

英汉例句

• by using a generalized four-level j-c model, the equation of motion of the field density matrix for the three-mode laser operating in the four-level atomic system is obtained.

  本文通过使用推广的j—c模型，获得了四能级原子系统中三模激光运转情况下场密度矩阵的运动方程。

• firstly, we studied the transitions in three-level system driven by a trichromatic field and probed by a monochromatic field. based on that, we wrote out the density matrix equation.

  首先研究了级联型三能级模型在三色驱动场和单色探测场作用下原子的跃迁情况，据此写出了密度矩阵所满足的方程。

• 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。

• 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。

• by means of the density matrix method, the necessary and sufficient conditions for a coherent state to remain coherent at all times are discussed.

  本文用密度矩阵方法研究了相干态在时间演化过程中仍保持为相干态的充要条件。

• a method is proposed to construct a localized active functional space from the density matrix of a large system. the large system is partitioned into central and surrounding areas.

  报道了从大体系的密度矩阵出发构造定域于指定局部的活性泛函空间的方法和程序。

• a general connection between the reduced fidelity susceptibility and quantum phase transitions is given in terms of the relation between reduced density matrix and ground-state energy.

  根据约化密度矩阵与基态能量之间的关系，我们给出了约化保真率和量子相变之间的一般关系。

• an analytic representation for the third-harmonic generation along the well is derived by the density matrix operator theory of the quantum mechanics.

  利用量子力学中的密度矩阵算符理论导出了该系统中三次谐波产生的解析表达式。

• we test the separability of the density matrix by researching the simple combinatorial condition (the 「degree condition」), the condition is directly related to the ppt-criterion.

  通过对图的密度矩阵简单的组合条件（「度数条件」）判断图的密度矩阵的可分性。 这个条件直接与ppt判据相联系。

• expressions used for extracting the alignment parameter of photofragment from the laser induced fluorescence (lif) intensity are derived by employing the density matrix approach.

  采用密度矩阵方法，推导了从激光诱导荧光（lif）强度中抽出光碎片取向参数的表达式。

• using density matrix equation, we calculate and discuss the effect of intermediate energy level offset on the quantum interference of spontaneous emission in y-type level system.

  文章运用密度矩阵方程，在y型四能级系统中计算和讨论了中间共振增强能级的失谐对自发辐射量子干涉效应的影响。

• the effects of atomic coherence on fiber amplifiers pumped by two lasers with different frequences are studied by using density matrix theory.

  用密度矩阵的方法从理论上分析了不同频率的两个激光场混合泵浦的光纤放大器中，由光场诱导的原子相干效应。

• the density matrix and the entropy are calculated.

  计算了密度矩阵、配分函数和熵。

• 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。

• the concepts of uniform markov processes in random environment, branching q-process in random environment and random branching transition density matrix are introduced.

  最后证明了任意随机分枝转移密度矩阵都是零流入的。

• 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。

• 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。

• since most chemical reactions are carried out in the liquid phase, the density matrix theory has been widely used in the study of molecular reaction dynamics.

  由于多数化学反应在液相中进行，故密度矩阵理论被广泛地应用于研究液相分子反应动力学。

• in this paper, expound a semiclassical density matrix theory, it was used by author in theoretical study of miniature optically pumped submillimeter wave laser.

  重点论述在小型光泵亚毫米波激光的理论研究中所应用的量子系统的半经典密度矩阵理论。

• 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。

• then the cross-spectrum density matrix between the motions and waves is obtained and the time history of motions of barge in random seas is simulated.

  由此频率响应矩阵求得各运动间的互谱密度矩阵并模拟驳船在随机海浪中的运动时历变化。

• using density matrix equation, the absorption of the probing field in n-type four-level atomic system with three coupling laser-fields under introducing laser field linewidth is calculated.

  采用密度矩阵方程，在引入激光场线宽的条件下，计算了n型四能级原子系统中介质对探测场的吸收。

• next this paper has derived element force density matrix including membrane line element and t element under internal air pressure on the basis of force density method and the finite element method.

  然后本文以力密度法和有限单元法为基础，推导了在内压作用下的膜线单元力密度矩阵和t单元力密度矩阵；

• 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。