查询词典 density matrix

Using the density matrix of the canonical ensemble,we have deduced the formulate of the quantum fluctuations of both charge and current in a non-dissipative mesoscopic coupled circuit.

根据正则系综的密度矩阵导出耦合互感电路中电荷和电流的量子涨落，得到了量子涨落与温度的依赖关系。

The key components in laser gyro is He-Ne ring laser, and the reciprocal action theory between light and medium is the base in studying the ring laser, use the Lamb half classical theory, and on the base of density matrix theory, the optical Brounch equation was established, which described the movement of amplifying medium atom in the ring syntonic cavity, and according to the medium polarize theory the self consistent equations was deduced, which describe the light intensity and phasic of the counter-propagating wave. On the basis of this equations, adopted the simulation software MATLAB and virtual instrument programming language LabWindows/CVI, we can do some simulated experiments in study the phenomenas such as amplify and dispersive characteristic of medium, mode pushing effection, burned hole effection and pattern competition, lock-in of frequency and the characteristic of light intensity and phasic of the counter-propagating wave in laser gyro.

激光陀螺的核心部件为He-Ne环形激光器，而掌握光与介质的相互作用理论是研究激光器的关键，采用拉姆半经典理论为主，在密度矩阵理论的基础上，推导环形谐振腔中描述He-Ne气体增益介质原子运动的光学布洛赫方程，运用介质极化理论得出描述激光陀螺反向行波的光强、位相所满足的自洽场方程组，在此基础上，运用MATLAB仿真软件和虚拟仪器编程语言LabWindows/CVI，对激光陀螺中的介质增益色散特性、频率牵引效应、烧孔效应及模竞争、闭锁效应及环激光的光强和相位特性进行仿真试验研究，并且运用全量子理论，对激光工作原理进行分析，得出二能级系统单模辐射场的光子数密度分布，得出激光场的光子统计分布，仿真激光场的动态建立过程。

The Cholesky decomposition of cross spectral density matrix was approximated and reduced, and then the modified spectral representation method is efficient and requires less computer memory, which is suitable for simulating spatial wind fields of long span bridges.

针对现有Deodatis方法模拟大跨度桥梁空间脉动风场中存在的计算量问题，通过对谱分解矩阵引入插值近似，减少谱分解的次数，从而提高该谐波合成法的计算效率，并节省内存花费，实现了对三维空间脉动风场的有效模拟。

The fourth chapter gives the concrete numerical calculation method of surface Green\'s function and density matrix.

第4章给出了具体的表面格林函数和密度矩阵的数值计算方法。

In this article, we discuss the different definitions of density matrix.

讨论了密度矩阵的不同定义。

A method is proposed to construct a localized active functional space from the density matrix of a large system.

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。2。

In fact, we point out that it is true for the density matrix of the nearest point graph.

证明了这个度数条件是三体态可分的必要条件，于是猜想它也是充分条件。

This equation is the evolutionary equation of the reduced density matrix which is useful for the study of general master equation.

这个方程式约化密度矩阵的演化方程，它对一般主方程的研究很有用。

In some cases, however, the quantitatively accurate results necessitate the density matrix theory and the semiclassical model.

文中还叙述了最主要的十余种物理机制对各个激光脉冲参数的影响并将某些理论计算与实验结果进行了比较。

The density matrix formalism in quantum mechanics, and quantum statistical mechanics.

量子力学的密度矩阵形式，以及量子统计力学。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。