On Arising Nanohydrides in Reduced Alkaline Solution

Reduced order solution of structured linear systems arising in certain PDE-constrained optimization problems

The solution of PDE-constrained optimal control problems is a computationally challenging task, and it involves the solution of structured algebraic linear systems whose blocks stem from the discretized first-order optimality conditions. In this paper we analyze the numerical solution of this large-scale system: we first perform a natural order reduction, and then we solve the reduced system it...

On Efficient Solution of Linear Systems Arising in hp-FEM

This contribution studies the static condensation of internal degrees of freedom which allows for efficient solution of linear algebraic systems arising in higher-order finite element methods. On each element, the static condensation eliminates the degrees of freedom corresponding to the internal (or bubble) basis functions. The elimination is local in elements and can be done in parallel. The ...

On the Solution of Indefinite Systems Arising in Nonlinear Optimization

We consider the application of the preconditioned conjugate gradient (PCG) method to the solution of indefinite linear systems arising in nonlinear optimization. Our approach is based on the choice of quasidefinite preconditioners and of a suitable factorization routine. Some theoretical and numerical results about these preconditioners are obtained. Furthermore, we show the behaviour of the PC...

SYNERGISTIC INFLUENCE OF NITRITE ON INHIBITION OF MILD STEEL CORROSION IN CHLORIDE CONTAMINATED ALKALINE SOLUTION

Corrosion behavior of mild steel in chloride contaminated alkaline solution has been studied for the period up to 100days. Saturated Calcium hydroxide solution was used as alkaline solution and 0.5M NaCl solution was used to accelerate mild steel corrosion. The Charge transfer resistance Rct, Current density Icorr and inhibition efficiency values were obtained from tafel polarization and electr...

Chemistry of +1 Iodine in Alkaline Solution