Zobrazeno 1 - 10
of 129
pro vyhledávání: '"Sameh Y"'
Publikováno v:
Fibers, Vol 11, Iss 5, p 42 (2023)
Concrete is an essential artificial building material in modern society. However, because concrete structures have brittle characteristics, they have a limited service life when subjected to dynamic loads. Nuclear emissions and explosions threaten hu
Externí odkaz:
https://doaj.org/article/b282f362f5ec4ff5afd1a070b2276c66
Autor:
Sameh Y. Elnaggar, Gregory N. Milford
Publikováno v:
Royal Society Open Science, Vol 8, Iss 8 (2021)
There is a recent interest in understanding and exploiting the intriguing properties of space–time metamaterials. In the current manuscript, the time periodic circuit theory is exploited to introduce an appropriate translation operator that fully d
Externí odkaz:
https://doaj.org/article/69480ad5c3cb459784fa2b2c0641c39f
Autor:
ELnaggar, Sameh Y., Antar, Yahia. M.
Using the Observable form of Maxwell's equations, we reveal that effective parameters at materials boundaries emerge naturally as anisotropic transfer functions. The complexity of the boundary dictates the order of these functions. Employing the resi
Externí odkaz:
http://arxiv.org/abs/2401.11581
An Electrodynamics solver for moving sources is introduced. The main challenges and formulation are highlighted. The solver enables the simulation of fields for sources undergoing arbitrary motion. Two examples of uniformly moving current sources are
Externí odkaz:
http://arxiv.org/abs/2212.05997
An ab-initio analysis based on coupled mode theory (CMT) is applied to describe the interaction dynamics of high dielectric resonators (DRs) with its containing aqueous solution. We prove that the coupling mechanism is reciprocal. Such property is ex
Externí odkaz:
http://arxiv.org/abs/2008.09861
The time periodic circuit theory is exploited to introduce an appropriate translation operator that is invariant under the change of the spatial unit cell. Useful properties of the operator are derived. By casting the problem in an eigenvalue problem
Externí odkaz:
http://arxiv.org/abs/2005.08619
Using the time periodic ABCD parameters, an expression for the dispersion relation of space-time modulated structures is obtained. The relation is valid for general structures even when the spatial granularity is comparable to the operating and modul
Externí odkaz:
http://arxiv.org/abs/1901.08698
The properties of space-time modulated media operating in the sub-sonic regime are discussed based on rigorous Bloch-Floquet theory. A geometrical description in the frequency-wavenumber plane is developed to provide insight into the possible interac
Externí odkaz:
http://arxiv.org/abs/1707.00050
Autor:
Elnaggar, Sameh Y.
Similar to the hybridization of three atoms, three coupled resonators interact to form bonding, anti-bonding and non-bonding modes. The non-bonding mode enables an electromagnetic induced transparency like transfer of energy. Here the non-bonding mod
Externí odkaz:
http://arxiv.org/abs/1611.09647
There is recent interest in the inter and intra element interactions of metamaterial unit cells. To calculate the effects of these interactions which can be substantial, an ab initio general coupled mode equation, in the form of an eigenvalue problem
Externí odkaz:
http://arxiv.org/abs/1305.6085