The accuracy of several density functionals for exchange energy (LDA,B88,BR89,B2000,VSX and CPX,a composite functional proposed in the present paper) has been examined through the calculation of a series of atoms and molecules by means of DFT method with different exchange potential functionals.

The ion-exchange capability of polypropylene anion exchange fiber for Cr(Ⅵ) was studied.

Though two ways of approximating get the same orbital wave function and total energy,the exchange energy,Coulomb energy and oneelectron energy,they compose the total energy,take different proportions in the two methods.

Analysis of the poisoned ion exchange resin proves that the pollution of ion exchange resin by iron compound is the main reason leading to exchanging ability reduction.

Seasonal variations of CO_2 flux,energy exchange and water vapor transfer over a cropland in Huaihe River Basin,China;

By giving the three atoms′ preliminary energy and no outside perturbing, it was found that if the system nonlinear coefficients were changed, the system dynamical behaviors would be greatly changed and the three atoms energy exchange would also greatly be changed.

It is shown that there exists energy exchange between the exciton and cavity field when the cavity is initially in the vacuum state, and the exciton is initially in a superposition of the vacuum state and number state.