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Polarity effects in unsupported polar nanoribbons
(American Physical Society, 2013-05)
We analyze the characteristics of polarity in unsupported nanoribbons with zigzag edges, by a combination of analytic models, semiempirical Hartree-Fock simulations, and first-principles approach. We consider two materials ...
Polar caps during geomagnetic polarity reversals
(Wiley Blackwell Publishing, Inc, 2019-02)
Changes in the Earth’s magnetic field can deeply modify the polar caps and auroral zones, which are the regions of most frequent precipitation of energetic particles. The present field is characterized by a dominant dipole ...
Measuring the continuum polarization with ESPaDOnS
(European Southern Observatory, 2015)
Aims. Our goal is to test the feasibility of obtaining accurate measurements of the continuum polarization from high-resolution spectra using the spectropolarimetric mode of ESPaDOnS. Methods. We used the new pipeline OPERA ...
On a conjecture by Mbekhta about best approximation by polar factors
(American Mathematical Society, 2021-11)
The polar factor of a bounded operator acting on a Hilbert space is the unique partial isometry arising in the polar decomposition. It is well known that the polar factor might not be a best approximant to its associated ...
A model for the competition between political mono-polarization and bi-polarization
(American Institute of Physics, 2020-06)
We investigate the phenomena of political bi-polarization in a population of interacting agents by means of a generalized version of the model introduced by Vazquez et al. [Phys. Rev. E 101, 012101 (2020)] for the dynamics ...
Jones matrix treatment for optical Fourier processors with structured polarization
(Optical Society of America, 2011-02)
We present a Jones matrix method useful to analyze coherent optical Fourier processors employing structured polarization. The proposed method is a generalization of the standard classical optical Fourier transform processor, ...
News Sharing, Gatekeeping, and Polarization: A Study of the #Bolsonaro Election
(Taylor & Francis, 2020-12-04)
What explains news sharing in polarized social media environments? Will polarization of the audiences further polarize news organizations? In this article, we connect existing theories of news sharing and gatekeeping to ...
Storm‐enhanced plasma density and polar tongue of ionization development during the 15 May 2005 superstorm
(American Geophysical Union, 2015-05-20)
We investigate the ionosphere's global response to the 15 May 2005 superstorm in terms of storm evolution and ionospheric electrodynamics. Our aim is to study the global distribution of plasma and the resultant large‐scale ...
Singularidad de la polar de un germen de curva irreducible de género uno
(Pontificia Universidad Católica del PerúPE, 2017)
Polarization and transverse mode behaviour of VCSELs under optical injection
(Springer, 2006-03)
A theoretical analysis of the polarization and transverse modes of Vertical-cavity Surface-emitting lasers with external optical injection is performed. We show that, for single-mode operation, weak injection of linearly ...