8,755 research outputs found
Optimizing magneto-dipolar interactions for synchronizing vortex based spin-torque nano-oscillators
We report on a theoretical study about the magneto-dipolar coupling and
synchronization between two vortex-based spin-torque nano-oscillators. In this
work we study the dependence of the coupling efficiency on the relative
magnetization parameters of the vortices in the system. For that purpose, we
combine micromagnetic simulations, Thiele equation approach, and analytical
macro-dipole approximation model to identify the optimized configuration for
achieving phase-locking between neighboring oscillators. Notably, we compare
vortices configurations with parallel (P) polarities and with opposite (AP)
polarities. We demonstrate that the AP core configuration exhibits a coupling
strength about three times larger than in the P core configuration.Comment: 8 pages, 11 figure
Relax-and-fix heuristics applied to a real-world lot-sizing and scheduling problem in the personal care consumer goods industry
This paper addresses an integrated lot-sizing and scheduling problem in the
industry of consumer goods for personal care, a very competitive market in
which the good customer service level and the cost management show up in the
competition for the clients. In this research, a complex operational
environment composed of unrelated parallel machines with limited production
capacity and sequence-dependent setup times and costs is studied. There is also
a limited finished-goods storage capacity, a characteristic not found in the
literature. Backordering is allowed but it is extremely undesirable. The
problem is described through a mixed integer linear programming formulation.
Since the problem is NP-hard, relax-and-fix heuristics with hybrid partitioning
strategies are investigated. Computational experiments with randomly generated
and also with real-world instances are presented. The results show the efficacy
and efficiency of the proposed approaches. Compared to current solutions used
by the company, the best proposed strategies yield results with substantially
lower costs, primarily from the reduction in inventory levels and better
allocation of production batches on the machines
Promoção do crescimento em mudas micropropagadas de bananeira por rizobactérias.
A micropropagação in vitro constitui uma ferramenta eficiente na obtenção de mudas sadias e homogêneas. Entretanto, a micropropagação também elimina a microbiota benéfica ao crescimento vegetativo. (Lazarovits e Nowak, 1997). A re-introdução de certos microrganismos tanto de forma individual como misturas de isolados, via tratamento de explantes, podem promover o crescimento das futuras plântulas e protegê-las contra doenças (Lazarovits e Nowak, 1997; Siddiqui e Shaukat, 2002). Rizobactérias ou PGPR (plant growth-promoting rhizobacteria) são bactérias saprófitas que vivem na rizosfera das plantas, e têm sido relacionadas com o incremento da produção agrícola como promotoras do crescimento de plantas e como agentes de biocontrole de doenças (Chen et al., 1996; Liu et al., 1995)pdf 121
Growth and nutrient uptake by potted foliage anthurium.
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Produção de frutos e compostos funcionais de quatro cultivares de morangueiro.
Suplemento. Trabalho apresentado no 52. Congresso Brasileiro de Olericultura, Salvador, 2012
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