6,146 research outputs found
Antioxidants of natural plant origins: from sources to food industry applications
ReviewIn recent years, great interest has been focused on using natural antioxidants in food
products, due to studies indicating possible adverse effects that may be related to the consumption of
synthetic antioxidants. A variety of plant materials are known to be natural sources of antioxidants,
such as herbs, spices, seeds, fruits and vegetables. The interest in these natural components is
not only due to their biological value, but also to their economic impact, as most of them may be
extracted from food by-products and under-exploited plant species. This article provides an overview
of current knowledge on natural antioxidants: their sources, extraction methods and stabilization
processes. In addition, recent studies on their applications in the food industry are also addressed;
namely, as preservatives in different food products and in active films for packaging purposes and
edible coatingsinfo:eu-repo/semantics/publishedVersio
Public Firms in a Dynamic Third Market Model
We set the third market model in a dynamic context to decide whether a country can achieve benefits by subsidizing a public rm's exports. We use calculus of variations with the constraint that the welfare is either maximized or grows at constant rate, reflecting the public concern of the firm. We conclude that a subsidy can be a good strategy for the country in some instances, even though only over a finite period of time. The duration of this period depends on the output strategy of the public firm as well as on exogenous factors.public firms, strategic trade policy, third market model, calculus of variations
Chaotic and deterministic switching in a two-person game
We study robust long-term complex behaviour in the Rock-Scissors-Paper game with two players, played using reinforcement learning. The complex behaviour is connected to the existence of a heteroclinic network for the dynamics. This network is made of three heteroclinic cycles consisting of nine equilibria and the trajectories connecting them. We provide analytical proof both for the existence of chaotic switching near the heteroclinic network and for the relative asymptotic stability of at least one cycle in the network, leading to behaviour ranging from almost deterministic actions to chaotic-like dynamics. Our results are obtained by making use of the symmetry of the original problem, a new approach in the context of learning.learning process, dynamics, switching, chaos
The Discrete Markus-Yamabe Problem for Symmetric Planar Polynomial Maps
We probe deeper into the Discrete Markus-Yamabe Question for polynomial
planar maps and into the normal form for those maps which answer this question
in the affirmative. Furthermore, in a symmetric context, we show that the only
nonlinear equivariant polynomial maps providing an affirmative answer to the
Discrete Markus-Yamabe Question are those possessing Z2 as their group of
symmetries. We use this to establish two new tools which give information about
the spectrum of a planar polynomial map
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