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Mostrando ítems 11-20 de 379
Magnetic twist and writhe of active regions: On the origin of deformed flux tubes
(EDP Sciences, 2003-12)
We study the long term evolution of a set of 22 bipolar active regions (ARs) in which the main photospheric polarities are seen to rotate one around the other during several solar rotations. We first show that differential ...
Invariant bilinear forms of algebras given by faithfully flat descent
(World Scientific, 2015-04)
The existence of nondegenerate invariant bilinear forms is one of the most important tools in the study of Kac-Moody Lie algebras and extended affine Lie algebras. In practice, these forms are created, or shown to exist, ...
REIDEMEISTER SPECTRUM FOR METABELIAN GROUPS OF THE FORM Q(n) x Z AND Z[1/p](n) x Z, p PRIME
(WORLD SCIENTIFIC PUBL CO PTE LTD, 2011)
In this paper, we study the Reidemeister spectrum for metabelian groups of the form Q(n) x Z and Z[1/p](n) x Z. Particular attention is given to the R(infinity)-property of a subfamily of these groups.
Electrically Tunable Gauge Fields in Tiny-Angle Twisted Bilayer Graphene
(2018-10-01)
Twisted bilayer graphene has recently attracted a lot of attention for its rich electronic properties and tunability. Here we show that for very small twist angles, α1°, the application of a perpendicular electric field ...
Twisted Flux Tube Emergence Evidenced in Longitudinal Magnetograms: Magnetic Tongues
(Springer, 2011-05)
Bipolar active regions (ARs) are thought to be formed by twisted flux tubes, as the presence of such twist is theoretically required for a cohesive rise through the whole convective zone. We use longitudinal magnetograms ...
Magnetic twist profile inside magnetic clouds derived with a superposed epoch analysis
(EDP Sciences, 2020-03)
Context. Magnetic clouds (MCs) are large-scale interplanetary transient structures in the heliosphere that travel from the Sun into the interplanetary medium. The internal magnetic field lines inside the MCs are twisted, ...
ROTATED A(n)-LATTICE CODES OF FULL DIVERSITY
(Amer Inst Mathematical Sciences-aims, 2020-09-20)
Some important properties of lattices are packing density and full diversity, which may be good for signal transmission over both Gaussian and Rayleigh fading channel, respectively. The algebraic lattices are constructed ...
Active-region twist derived from magnetic tongues and linear force-free extrapolations
(Springer, 2015-12)
The main aim of this study is to compare the amount of twist present in emerging active regions (ARs) from photospheric and coronal data. We use linear force-free field models of the observed coronal structure of ARs to ...
Rieffel Deformation and Twisted Crossed Products
(Oxford University Press, 2015)
To a continuous action of a vector group on a C∗-algebra, twisted by the imaginary
exponential of a symplectic form, one associates a Rieffel deformed algebra as well as
a twisted crossed product. We show that the second ...