The purpose of this paper is to evaluate the sub-leading term of strong coupling expansion of heavy-quark potential in N=4 SYM vacuum.

Heavy quarkonium spectra are investigated within the heavy quark potential model, which is obtained from the dilatongluon (motivated by superstring theory) effect coupling.

Using the heavy quark antiquark potential which emerges from an effective dilaton gluon coupling inspired by the superstring theory, we study the energy levels of heavy quark antiquark systems.

The color screening effects are investigated on heavy quarkonium spectra within the framework of heavy quark potential model.

Spectroscopy for the Bound States of a Top Squark(?) and a Heavy Quark;

The flavor dynamic parameter modification of heavy quarks fragmentation function(β distribution function) has been assumed to be equal to its mass effect The experimental dato show that the peak of fragmentation function shifts to ligger z value with the mass of quark.

In the framework of the constituent quark model, the spin-orbit splitting of the lowest L=1 excited states of N and Λ are analyzed by using various quark potential models.

A new quark potential model, called quark delocalization and color screening model, has been proposed.

Non-relativistic quark potential model is a simpler and more useful phenomeno-logical model among the various theories for describing the quark motion in hadrons.