A gauge invariant and Lorentz-irreducible three-gluon conserved vector current is constructed, and the mass of the vector glueball is calculated in the framework of the Quantum Chromodynamics sum rules.

The B spline method for calculating the correlation energy of helium atoms is proposed.The result is compared with that by Slater basis functions.The virtue defect and practicability of B spline technique are analysed.It is shown that the B spline technique can be used widely in the calculation of electronic interaction.

In this article, the B spline technique is employed to calculate the energy values of a number of low-lying states of hydrogen atom in the presence of a homogeneous magnetic field of arbitrary strength (０＜Ｂ≤４．７×１０8T) our results fill the gaps in the results of the works by Rosner et al. and Ivanov, and agree well with those obtained by other theoretical calculations. B spline functions are proved to be powerful in treating the excited, as well as ground states of hydrogen in magnetic field.