This paper presents several acceleration techniques for reduced-order models based on the proper orthogonal decomposition (POD) method. The techniques proposed herein are: (i) an algorithm for splitting the database of snapshots generated by the full-order model, (ii) a method for solving quasi-symmetrical matrices, and (iii) a strategy for reducing the frequency of the projection. The accelera...

The most difficult integral arising in Hylleraas-configuration interaction (Hy-CI) calculations, the three-electron triangle integral, is discussed. We focus on recursive techniques at both the double precision and quadruple precision level of accuracy while trying to minimize the use of higher precision arithmetic. Also, we investigate the use of series acceleration to overcome problems of slo...

Fast and TReX tools are designed to analyse systems with infinite state spaces. They both implement algorithms computing the set of reachable states of such systems. Since the state space may be infinite, acceleration techniques are used . In this paper, we study the differences between Fast and TReX acceleration techniques and show that although Fast remains in Presburger logics while accelera...

This study aims to: 1) Produce swimming learning aids, 2) Swimming aids that are easy to use and practical. The population of the small class trial was 20 students who could not swim, while main field test conducted on 40 SMA Negeri 5 Ambon. research method used is development (R&D) model follows ten stages product design, namely; potential problems; Data collection; 3) design; 4) design va...

Locomotor performance can influence the ecological and evolutionary success of a species. For fish, favorable outcomes of predator-prey encounters are often presumably due to robust acceleration ability. Although escape-response or “fast-start” studies utilizing high-speed cinematography are prevalent, little is known about the contribution of relative acceleration performance to ecological or ...

Locomotor performance can influence the ecological and evolutionary success of a species. For fish, favorable outcomes of predator-prey encounters are often presumably due to robust acceleration ability. Although escape-response or "fast-start" studies utilizing high-speed cinematography are prevalent, little is known about the contribution of relative acceleration performance to ecological or ...

Quasi-Newton methods have proven to be an efficient way couple partitioned solvers in fluid-structure interaction problems, as they are able stabilize cases with high added-mass, well accelerate the convergence. However, these assume that coupled system is a complete black-box, whereas often, its behavior approximated by surrogate model. Such model may obtained coarsening system, simplifying ph...