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A Bohr atom is a solar system in miniature, with electrical forces taking the place of gravitational forces.

玻尔的原子模型是太阳系的缩影，不过以电力替代万有引力。

For example, in general terms, as the angular momentum of the Bohr hydrogen atom quantum theory of the third assumption, In fact it is introduced to the Bohr from the correspondence principle, do not think it is a basic assumption.

比如，现在一般把角动量量子化的条件作为玻尔氢原子理论的第三个假设，而实际上它是玻尔从对应原理中推出来的，并不认为它是一个基本假设。

Week 14 Regular nature of hydrogen atomic spectrum and Bohr hydrogen atom theory, wave –particle dualism of matter and uncertainty relation

第14周氢原子光谱的规律性和玻尔的氢原子理论；实物粒子的波粒二象性和不确定关系。

Combining the idea of quantization and the semi-classical hydrogen model of Bohr, the structure of atom is described. Solving the Schrodinger equation, the deduced wave function is related to the probability of finding the electron in space.

经由波尔之半古典的氢原子模型，结合量子化的概念以解释原子结构，并引入薛丁格方程式所求得之波函数与电子之空间机率的关系。

However, if the distance between the tungstn tip and Al (100) surface is close enough, about 9 Bohr, the single Al atom under the tungsten tip can be extracted from the surface without any electrical field.

与半导体情形不同的是，在针尖与样品表面距离小于约9Bohr时，仅依靠针尖作用可以让Al原子自动脱离Al（100）表面。

Week 15 Experiment law of hydrogen atomic spectrum, Bohr hydrogen atom theory, wave -particle dualism of matter, de Broglie waves, uncertainty relation, wave function and its statistical explanation, standard condition of wave function, Schrodingger equation in one dimension, simple introduction of quantum mechanics.

第15周氢原子光谱的实验规律，氢原子的玻尔理论；波粒二像性，德布罗意波，不确定关系；波函数及其统计解释，波函数的标准条件，一维薛定谔方程，量子力学简介。

Bohr radius was the radius of the circle in which the electron moved in the ground state of the hydrogen atom, according to the Bohr theory.

根据玻尔理论，玻尔半径是在基态氢原子中电子运动的圆周半径。

The 1s electron cloud in hydrogen atom has the largest probability density distribution around a spherical shell with Bohr radius a 0. The author thinks the probability density distribution and electron cloud belong in fact,to statistic regularity, and imply a macro-time scale is used, therefore in hydrogen molecule the product of energy and time is far larger than Planck Constant.

氢原子中 1s电子的电子云呈球形，电子的最大几率密度分布出现在玻尔半径a0 的球壳内，认为几率密度分布及电子云属统计规律，意味着已经使用了宏观时标，这样就使氢分子体系中能量和时间的作用量远大于普郎克常数；根据电子云的交叠，用经典力学计算了基态氢分子的结构常数，获得键长、键能及力常数的表达式分别为Re=2a0 ，De=ze/4 2a0 ，k=ze/2 2a30 ，采用原子单位 a 。u 。

Bond and angle types are assigned based on (1) atom types,(2) bond lengths or bond angles in the QM optimised geometry and (3) matching force constants derived from the Hessian matrix.

键和键角类型标记，依据（1）原子类型（2）量子优化几何学中的键长或者键角（3）源于 Hessian 矩阵的合适的力常数。

The objectives of this paper are to study a new simple calculation of elements' electronegativity and bond energy in double-atom molecules and to explore its physical significance.

研究了电负性和双原子分子键能的一种简单算法，并对其物理意义作初步探讨。

As of Tuesday, Google's results were still censored in China.

截至周二，谷歌的搜索结果仍受中国审查。

In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.

在这一过程中，人的主体性发挥是社会有机体健康发展的灵魂。