Results 271 to 280 of about 270,101 (314)
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Structure of Certain Periodic Rings
Canadian Mathematical Bulletin, 1985AbstractLet R be a periodic ring, N the set of nilpotents, and D the set of right zero divisors of R. Suppose that (i) N is commutative, and (ii) every x in R can be uniquely written in the form x = e + a, where e2 = e and a ∊ N. Then N is an ideal in R and R/N is a Boolean ring.
Abu-Khuzam, Hazar, Yaqub, Adil
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Defect Dragging in Periodic Structures
2007Waves or pulses propagating along periodic structures cause thermally controlled transport of diffusing defects. The dragging waves/pulses may modulate the amplitude of the substrate as well as the geometry of the boundaries where the defects are confined.
BORROMEO, Marcello, Marchesoni F.
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A periodic structure mimics a metamaterial
Journal of the Optical Society of America A, 2007We show that properties attributed to planar metamaterials that support resonances due to an appropriately shaped unit cell can also be identified in a medium that exhibits a resonance evoked by its period only. By choosing a subwavelength period, the effective material parameters of such a medium can be retrieved from the complex reflected and ...
Rockstuhl, Carsten +2 more
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Permeability relation for periodic structures
Magnetic Resonance Imaging, 1998The permeability relation for periodic porous media is studied with respect to other petrophysical parameters such as formation factor, porosity, surface-to-volume ratio, and nuclear magnetic resonance (NMR) relaxation time. All these quantities were computed for periodic structures of simple, body-centered, and face-centered cubic arrays of touching ...
K J, Dunn, G A, LaTorraca, D J, Bergman
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A ‘periodic table’ for protein structures
Nature, 2002Current structural genomics programs aim systematically to determine the structures of all proteins coded in both human and other genomes, providing a complete picture of the number and variety of protein structures that exist. In the past, estimates have been made on the basis of the incomplete sample of structures currently known.
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Structures and Superstructures in Periodical Polynucleotides
1986A renewed attention has been focused on the structural aspects of DNA in the last few years. Such revival of interest starting from the elucidation of the structure of some synthetic oligonucleotides is going beyond toward the understanding of the basic molecular mechanisms of control of genetic information, which are strictly correlated to the ...
DE SANTIS, Pasquale +3 more
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Resonances and Scattering by a Periodic Structure
Russian Journal of Mathematical PhysicszbMATH Open Web Interface contents unavailable due to conflicting licenses.
Borisov, D. I., Fedotov, A. A.
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Long-period polytype structures
Physical Review Letters, 1990Discussion du modele de Bruisma et Zangwill, en faisant intervenir deux effets de relaxation longitudinale, provenant des defauts d'empilement et des champs de deformation qui les ...
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Excitation of Rotationally Periodic Structures
Journal of Applied Mechanics, 1979A rotationally periodic structure consists of a finite number of identical substructures forming a closed ring. The vibrational behavior of such structures is considered, especially the forced response due to a rotating force. It is known that for a rotationally symmetric structure, excited by a rotating force, resonance for the n nodal diameters mode ...
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Electromagnetic Scattering by Periodic Structures
Journal of Mathematical Sciences, 2004The paper considers the existence and uniqueness problem for the stationary scattering of electromagnetic waves (diffraction) on a structure which is localized in the propagation direction of the wave, and is periodic in two other directions, taking piece-wise constant values (this corresponds to the usual structure of diffraction gratings).
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