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将Huckel-Hubbard方法推广应用于研究只有一个s价电子元素(用字母A标记这类元素)的团簇。计算了结构为团簇的最稳定结构。最后计算了该类团簇线性结构的s价电子体系能量E_n,两相邻团簇的s价电子体系的能量差ΔE=|E_n-E_(n-1)|与原子数n的关系显示出与实验相符合的奇偶性质。 相似文献
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Conformal invariance and conserved quantities of dynamical system of relative motion 总被引:1,自引:0,他引:1
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This paper discusses in detail the conformal invariance by
infinitesimal transformations of a dynamical system of relative
motion. The necessary and sufficient conditions of conformal
invariance and Lie symmetry are given simultaneously by the action
of infinitesimal transformations. Then it obtains the conserved
quantities of conformal invariance by the infinitesimal
transformations. Finally an example is given to illustrate the
application of the results. 相似文献
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A gradient system and a skew-gradient system can be merged into a combined gradient system. The differential equations of the combined gradient system are established and its property is studied. If a mechanical system can be represented as a combined gradient system, the stability of the mechanical system can be studied by using the property of the combined gradient system. Some examples are given to illustrate the applications of the results. 相似文献
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光的衍射法测量杨氏模量 总被引:1,自引:0,他引:1
拉伸法测量金属丝杨氏模量的关键是如何测准金属丝在拉力作用下的微小伸长量。本文利用光的衍射法可以较精确地测量长度变化这一特点,对钢丝的杨氏模量进行了测量,给出测量杨氏模量的一种新方法。 相似文献
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We have studied the algebraic structure of the dynamical equations of a rotational relativistic Birkhoff system. It is proven that autonomous and semi-autonomous rotational relativistic Birkhoff equations possess consistent algebraic structure and Lie algebraic structure. In general, non-autonomous rotational relativistic Birkhoff equations possess no algebraic structure, but a type of special non-autonomous rotational relativistic Birkhoff equation possesses consistent algebraic structure and consistent Lie algebraic structure. Then, we obtain the Poisson integrals of the dynamical equations of the rotational relativistic Birkhoff system. Finally, we give an example to illustrate the application of the results. 相似文献