原子核

The electron cloud is bound to the nucleus by the attraction of opposite charges.

由于正负电荷间的吸引而使带负电的电子受带正电的原子核约束。

Most of the atom's volume consists of a cloud of electron s that have very small mass and negative charge.

原子核被弥散的电子云环绕，电子是带负电的几乎没有质量的粒子。

I clearly under- stand that pellet is an atomic nucleus, but the small light spot is an electron cloud.

我清楚地明白，那小球就是原子核，而小亮斑则是电子云。

According to related theories,the ultraviolet spectrum of atomic materials,especially the electron energy transition around alkali metal atomic nucleus is analyzed and calculated,and the spectral line data is listed in this paper.

根据相关理论，重点对原子紫外光谱，尤其是碱金属原子核外电子的能量跃迁进行了分析和计算，列出了计算的谱线数据。

The latter includes a kinetic energy operator corresponding to the contributions from the nuclei.

后者通常还包括一个原子核的动能算符项。

B. kinetic energy of the neutron, excitation energy of the nucleus, and excitation energy of the

B。 中子的动能，原子核的激动能，和中子的激动能

D. excitation energy of the neutron, kinetic energy of the nucleus, and kinetic energy of the neutron.

D。 中子的激动能，原子核的动能，和中子的动能

Our calculation results indicate that the nuclear system is more regular in two-j shell than single-j case, and the nuclear system becomes more chaotic with the increase of excitation energy.

在粒子转子模型的单j壳和双j壳框架下，对原子核的转动能谱进行统计分析，并讨论了四极形变和转动惯量对系统混沌行为的影响。

Both cases are acompanied by the light-emission from the transition from higher excited-state to lower excited-state, and the total superfluous band energy of nuclear system is released by means of excited element, and an energy level appears in the ground-state band, which signifies a quantum phase transition.

基于微观IBM理论，提出转动诱导出玻色子量子相变的一种可能途径：一旦原子核在受到高能激发或作快速旋转时，假如外界提供的能量足以使玻色子完成拆对顺排，则核处于集体相与单粒子态的共存相，其特征是出现较密集的能谱；假如能量不足以完成拆对或顺排，可能发生两种情况之一，当核旋转达到某个临界转动频率ω c时，或者一个高角动量的玻色子脱离"集体"而"游离"出来，或者发生一个高角动量的玻色子转变为一个低角动量的玻色子，核仍旧处于集体相；均会伴随出现光辐射，产生基态带的一条能级——相变信号。

In addition, Fermi made important contributions to our understanding of quantum statistics and also atomic nuclei and subatomic particles.

此外，费米作出了重要贡献，我们的认识，量子统计，也原子核和粒子subatomic 。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。