Design, analysis and verification of hexagon split ring resonator based negative index metamaterial by Bose, Sumanta, Ramraj, M., Raghavan, S.

“…This paper proposes the design of a Hexagon Split Ring Resonator (HSRR) with skew angle rotation between inner and outer ring. Mathematical expressions for the resonant frequency of HSRR are formulated. …”
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Design of freeform mirrors using the concentric rings method by Jorge González-García, Agustin Santiago-Alvarado, Angel S. Cruz-Félix

“…For the case of segmented spherical rings, mathematical expressions were deduced to obtain the image points as a function of the radii of curvature. …”
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Evaluating high temperature elastic modulus of ceramic coatings by relative method by Guanglin Nie, Yiwang Bao, Detian Wan, Yuan Tian

“…Thus, the HT modulus of ceramic coatings can be evaluated by the substrate modulus and the load-deformation data of coated rings. Mathematic expressions of those calculations were derived for the beam and ring samples. …”
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Stable characters for symmetric groups and wreath products by Ryba, Christopher(Christopher Jonathan)

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Features of formation of Miscanthus giganteus planting material depending on cultivation technology elements by В. А. Доронін, В. В. Дрига, Ю. А. Кравченко, В. В. Доронін

“…Field, laboratory, visual, weight measu­ring, mathematical and statistical ones. Results. The features of the growth and development of the miscanthus bioenergy crop were investigated including the formation of planting material depending on the combined technology elements application during the planting time, namely: planting time, rhizome mass, the granules and the MaxiMarin absorbent gel. …”
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