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A flow-injection technique involving on-line catalytic digestion and spectrophotometric detection has been developed for the determination of iodine in urine. After urine samples are digested by KMnO4-K2Cr2O7-H2SO4 solution, the iodine in the urine catalyzes the reaction of As(III) with Ce(IV). The remaining Ce(IV) is then reacted with brucine and the… (More)
In this paper, The experiments were carried out in Gleeble 1500D thermo-mechanical simulator by double-pass hot compression method. Offset method(0.2%) was used to determine the softening. The static recrystallization softening behavior of 316LN steel under different deformation conditions was studied and static recrystallization kinetics model was… (More)
In this paper, we derive several sufficient conditions for monotonicity of eventually positive solutions on a class of second order nonlinear difference equation.