massic Helmholtz free energy

Being based on comparision of advantage and disadvantege of the two approaches,a new Helmholtz free energy is proposed to remain the advantage of the non local functional theory and considerably decrease complication of computation.

首先讨论了两种广泛应用的密度泛函方案——局域的和非局域的泛函，比较了它们的优点和缺点，从而建立了自己的亥姆霍兹自由能泛函，发挥了局域密度泛函的优点，又减少了它的严重计算繁杂性。

The Helmholtz free energy expansion of the Rochelle salt crystal is obtained by the basis function of the irreducible representations ofthe paraelectric phase group D2.

利用罗息盐晶体顺电相所属晶体点群-D2群不可约表示的基函数,构造出该晶体亥姆霍兹自由能展开式。