In this paper we study the bounded property of the Rice means for the cigcnfunction expansio~ foe elliptic operators on the Hardy spaces. Our result generalizes the classical result due to Sjolin and Stein-Taibleson-Weiss on the Boehner-Riesz means.

In this paper, we investigate the strong summability of multiple Fourier series by the Bochner-Riesz spherical means at criticnl index. We prove that the localization theorem of the strosng summability holds for any posityve degree, that is, if f(x) EL(Qn) and f(x)=0(1x-x01), then lim R-∞ 1/R R0|S #-1/2(f; x0)|qdu=0 (for any q>0). We also give certain results on the strong summability which improves Boehner-Ohand sekharan's theorem.

A new kind of funcion space generated by somooth blocks is introduced. The new spaces are used to investigate the relation between the smoothness imposed on blocks nad the rate of convergence of the Bochner-Riesz eans at the critical index.

In a recent paper [6] the last two authors of this article introduced a class of function spaces associated with the one-dimensional torus T. They showed that the Fourier series of each function f that belongs to one of these spaces converges to f (x) a.e. Moreover, they indicated that the motion of entropy is closely related to the study of these spaces. These features are not restricted to the one-dimenslonal case. In this paper, in fact, we show how these ideas can be used to study the convergence of Bochner-Riesz means of multiple Fourier series at the "critical index".