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1)  population difference
粒子数差
1.
A steady state linear analytical solution, and the effect of the probe and driving fields detunings varying on the noninversion lasing gain, dispersion and population difference are investigeted.
提出了具有非相干抽运的开放的ladder型无粒子数反转激光 (LWI)系统模型 ,给出了定态线性解析解 ,研究了探测场和驱动场失谐的变化对无粒子数反转激光增益、色散和粒子数差的影响。
2.
Effects of detuning on gain without inversion and population difference are studied.
提出开放的四能级双驱动场无反转激光系统的理论模型,由电偶极和旋转波近似得到其密度矩阵方程,讨论无反转激光产生的物理机制,利用数值计算结果分析探测场和驱动场失谐对系统无反转激光增益和粒子数差的影响。
2)  the particle number deviation
粒子数偏差
1.
By systematically analyzing the single particle level and the occupation probability near the Fermi surface of uranium isotopes and the particle number deviation within the relativistic mean-field model with BCS theory,we find that most of the uranium isotopes have more stable shell structure than ordinary elements,namely possess the shell effect characteristics similar to closed shell nucleus.
在考虑了BCS近似的相对论平均场模型的框架内,通过系统研究U同位素费米面附近的单粒子能级、单粒子能级占有概率和BCS近似下的粒子数偏差,首次发现U同位素中的大多数元素均有比一般元素更稳定的壳结构,即具有和闭壳核相似的壳效应特性。
3)  particle number population inversion
粒子数布居差
4)  Fe coatings
粒子参数
5)  number of particle
粒子数目
1.
The influences of the number of particles and the range of initial values adopted for water quality parameters to be evaluated on the convergence of the PSO algorithms were studied by numerical experiments.
分别就粒子数目和待估水质参数的初始取值范围对算法运算过程的影响进行了数值实验。
6)  numerical states
粒子数态
1.
It is found that the characteristic state of quantum mechanics system is consisted of numerical states of particle superposition state, the Berry s phase is minus twice of the area of the circuit in parameter space.
本文对单原子微波激射器中光场的Berry相位进行了计算,结果得到一个量子力学系统的本征态由粒子数态迭加而成,其Berry相因数是其在参数空间上闭合曲线面积的负二倍。
补充资料:粒子数比
分子式:
分子量:
CAS号:

性质:符号为R,粒子i与粒子k的粒子数比定义为粒子i的粒子数Ni除以粒子k的粒子数Nk。粒子数比为无量纲量。当粒子本身就是物质的量的基本单元时,粒子数比等于物质的量比。

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