http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/107 Tue, 19 May 2026 17:32:42 GMT 2026-05-19T17:32:42Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12340 Series representation of random mappings and their extension Dang, Hung Thang; Tran, Manh Cuong In this paper, we introduce a method of extending the domain of a random mapping admitting the series expansion. This method is based on the convergence of certain random series. Some conditions under which a random mapping can be extended to apply to all $X$ - valued random variables will be presented. Thu, 01 Jan 2009 00:00:00 GMT http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12340 2009-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12339 Non-commutative chern characters of the $C^*-$algebras of the sphers Nguyen, Quoc Tho We propose in this paper the construcion of non-commutative Chern characters of the $C^*-$algebras of spheres and quantum spheres. The final computation gives us clear relation with the ordinary $\mathbb Z/(2)-$graded Chern chracters of torsion or their normalizers. Thu, 01 Jan 2009 00:00:00 GMT http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12339 2009-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12338 Studying of characteristic of GEM40P4 HPGE detector by experiment Bui, Van Loat; et al. Radioactive sources which used to study were the standardized radioactive of common monoenergetic radionuclide Cs 137 and standardized multigamma Co60 , Ba 133 , Eu152 . Determination of the absolute efficiency curve and energy resolution as a function of energy of GEM40P4 HPGe spectrometer are presented in this paper. Thu, 01 Jan 2009 00:00:00 GMT http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12338 2009-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12336 Anharmonic effective potential, thermodynamic parameters, and EXAFS of hcp crystals Nguyen, Van Hung; et al. Anharmonic effective potential, effective local force constant, thermal expansion coefficient, three leading cumulants, and EXAFS (Extended X-ray Absorption Fine Structure) of hcp crystals have been studied. Analytical expressions for these quantities have been derived. Numerical calculations have been carried out for Zn and Cd. They show a good agreement with experiment results measured at HASYLAB (DESY, Germany) and unnegligible anharmonic effects in the considered quantities. Thu, 01 Jan 2009 00:00:00 GMT http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12336 2009-01-01T00:00:00Z