DSpace Community: http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/107 2026-05-17T15:59:33Z Series representation of random mappings and their extension http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12340 Title: Series representation of random mappings and their extension Authors: Dang, Hung Thang; Tran, Manh Cuong Abstract: 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. 2009-01-01T00:00:00Z Non-commutative chern characters of the $C^*-$algebras of the sphers http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12339 Title: Non-commutative chern characters of the $C^*-$algebras of the sphers Authors: Nguyen, Quoc Tho Abstract: 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. 2009-01-01T00:00:00Z Studying of characteristic of GEM40P4 HPGE detector by experiment http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12338 Title: Studying of characteristic of GEM40P4 HPGE detector by experiment Authors: Bui, Van Loat; et al. Abstract: 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. 2009-01-01T00:00:00Z Anharmonic effective potential, thermodynamic parameters, and EXAFS of hcp crystals http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12336 Title: Anharmonic effective potential, thermodynamic parameters, and EXAFS of hcp crystals Authors: Nguyen, Van Hung; et al. Abstract: 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. 2009-01-01T00:00:00Z