181,298 research outputs found
Cyclical Mackey Glass Model for Oil Bull Seasonal
No full textIn this article, we propose an innovative way for modelling oil bull seasonals taking into account seasonal speculations in oil markets. Since oil prices behave very seasonally during two periods of the year (summer and winter), we propose a modification of Mackey Glass equation by taking into account the rhythm of seasonal frequencies. Using monthly data for WTI oil prices, Seasonal Cyclical Mackey Glass estimates indicate that seasonal interactions between heterogeneous speculators with different expectations may be responsible for pronounced swings in prices in both periods. Moreover, the seasonal frequency / 3(referring to a period of 6 months) appears to be persistent over time.Oil bull seasonal, Seasonal speculations, Heterogeneous agents model, Seasonal Cyclical Mackey Glass models.
Trace maps for Mackey algebras
No full textLet G be a finite group and R be a commutative ring. The Mackey algebra μR(G) shares a lot of properties with the group algebra RG however, there are some differences. For example, the group algebra is a symmetric algebra and this is not always the case for the Mackey algebra. In this paper we present a systematic approach to the question of the symmetry of the Mackey algebra, by producing symmetric associative bilinear forms for the Mackey algebra. Using the fact that the category of Mackey functors is a closed symmetric monoidal category, we prove that the Mackey algebra μR(G) is a symmetric algebra if and only if the family of Burnside algebras RB(H) for H≤G is a family of symmetric algebras with a compatibility condition. As a corollary, we recover the well known fact that over a field of characteristic zero, the Mackey algebra is always symmetric. Over the ring of integers the Mackey algebra of G is symmetric if and only if the order of G is square free. Finally, if (K, O, k) is a p-modular system for G, we show that the Mackey algebras μO(G) and μk(G) are symmetric if and only if the Sylow p-subgroups of G are of order 1 or p.CT
Climatron
No full textDetail viewBuilt in 1960 by Murphy & Mackey using designs of R. Buckminster Fulle
Saint Louis Botanical Garden
No full textExterior, general viewBuilt by Murphy & Mackey using designs of R. Buckminster Fulle
Saint Louis Botanical Garden
No full textExterior, detail viewBuilt by Murphy & Mackey using designs of R. Buckminster Fulle
Saint Louis Botanical Garden
No full textExterior, general viewBuilt by Murphy & Mackey using designs of R. Buckminster Fulle
Saint Louis Botanical Garden
No full textInterior, detail of plantsBuilt by Murphy & Mackey using designs of R. Buckminster Fulle
Saint Louis Botanical Garden
No full textInterior, detail of plantsBuilt by Murphy & Mackey using designs of R. Buckminster Fulle
Saint Louis Botanical Garden
No full textExterior, general viewBuilt by Murphy & Mackey using designs of R. Buckminster Fulle
Saint Louis Botanical Garden
No full textInterior, detail of plantsBuilt by Murphy & Mackey using designs of R. Buckminster Fulle
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