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131.
Catalin Borcia Karin Popa Claudiu C. Pavel Adina Dascălu Cristina Viţelaru Bogdan A. Apetrăchioaei 《Journal of Radioanalytical and Nuclear Chemistry》2011,288(1):25-30
The sorption of the thallous ion from aqueous acidic solution (pH = 1.5) onto as-synthesized and modified ETS-10 titanosilicates
was studied by using an isotope dilution method and a batch-mode technique. The present results show that the thallium(I)
sorption was effective onto all three considered materials and is enhanced by the porosity and acidity modification of the
ETS-10 titanosilicate. The best uptake performance was achieved by the meso-ETS-10. This behavior is explained based on the
newly created additional mesoporous system and enriching the external surface with silanol groups. Also, the presence of phosphorus
enhanced the inherent porosity allowing thus better internal diffusion properties of crystalline material. However, the chemically
modified surface seems to have a negative contribution to the kinetic uptake of thallous ion as shown by the positive value
of the activation energy E
a, in comparison with the processes more favorable energetically for ETS-10 and meso-ETS-10 materials. 相似文献
132.
Aziz Takhirov Catalin Trenchea Jiajia Waters 《Numerical Methods for Partial Differential Equations》2023,39(1):90-107
In this article, we develop a second-order nonlinear filter based stabilization scheme for high Reynolds number flows. We prove the unconditional stability of the method, establish the second order consistency and discuss the dynamical tuning of the relaxation parameter. The scheme is then validated against experimental data for an isothermal turbulent flow in a Staggered Tube Bundle at Reynolds number of 18,000. Numerical results are found to be in an overall good qualitative and quantitative agreement with the benchmark results. 相似文献