4,371 research outputs found
Invisibility and PT Symmetry: A Simple Geometrical Viewpoint
We give a simplified account of the properties of the transfer matrix for a
complex one-dimensional potential, paying special attention to the particular
instance of unidirectional invisibility. In appropriate variables, invisible
potentials appear as performing null rotations, which lead to the
helicity-gauge symmetry of massless particles. In hyperbolic geometry, this can
be interpreted, via M\"{o}bius transformations, as parallel displacements, a
geometric action that has no Euclidean analogy.Comment: 13 pages. No figure. Accepted for publication in Symmetr
Size-Controlled Water-Soluble Ag Nanoparticles
Ag nanoparticles of two different sizes (1 and 4 nm) were prepared within an apoferritin cavity by using an Ag+-loaded apoferritin as a nanoconfined environment for their construction. The initial amount of Ag' ions injected in the apoferritin cavity dictates the size of the final Ag particles. The protein shell prevents bulk aggregation of the metal particles, which renders them water soluble and extremely stable
El sistema ejecutivo y las lesiones frontales en el niño
Frontal lobe syndrome in adulthood is characterised
by executive function deficits leading to altered behavioural control with
difficulties in social interactions and in maintaining stable jobs and
interpersonal relationships. Generalisation of this concept to children with
early frontal lobe damage is not straightforward. There are complex interactions
between the effects of the lesion itself and the effects in other interconnected
regions, timing of lesion, how long it was since the lesion occurred to the time
of evaluation, and how old the child is at examination. These facts lead to
consider that there might be a number of 'frontal syndromes' in childhood rather
than a unique one. We report 9 cases of children with early frontal lobe lesions
who were followed up for an average of 10 years. CONCLUSION: A variety of
different outcomes suggests that prognosis for these patients might be better
that previously reported
Brewster quasi bound states in the continuum in all-dielectric metasurfaces from single magnetic-dipole resonance meta-atoms
Bound states in the continuum (BICs) are ubiquitous in many areas of physics,
attracting especial interest for their ability to confine waves with infinite
lifetimes. Metasurfaces provide a suitable platform to realize them in
photonics; such BICs are remarkably robust, being however complex to tune in
frequency-wavevector space.Here we propose a scheme to engineer BICs and
quasi-BICs with single magnetic-dipole resonance meta-atoms. Upon changing the
orientation of the magnetic-dipole resonances, we show that the resulting
quasi-BICs,emerging from the symmetry-protected BIC at normal incidence, become
transparent for plane-wave illumination exactly at the magnetic-dipole angle,
due to a Brewster-like effect. While yielding infinite Q-factors at
normalincidence(canonical BIC), these are termed Brewster quasi-BICs since a
transmission channel is always allowed that slightly widens resonances at
oblique incidences. This is demonstrated experimentally through reflectance
measurements in the microwave regime with high-refractive-index mm-disk
metasurfaces. Such Brewster-inspired configuration is a plausible scenario to
achieve quasi-BICs throughout the electromagnetic spectrum inaccessible through
plane-wave illumination at given angles, which could be extrapolated to other
kind of waves.Comment: 15 pages, 7 figures; typos corrected, Figs. 3 & 5 modified, new Fig.
7 & references adde
The impact of perceived CSR on corporate reputation and purchase intention
Fil: Bianchi, Enrique Carlos. Universidad Nacional de Córdoba. Facultad de Ciencias Económicas. Departamento de Administración y Tecnología de la Información; Argentina.Fil: Bianchi, Enrique Carlos. Universidad Católica de Córdoba. Unidad Asociada al CONICET; Argentina.Fil: Bruno, Juan Manuel. Universidad Nacional de Córdoba. Facultad de Ciencias Económicas. Departamento de Administración y Tecnología de la Información; Argentina.Fil: Sarabia-Sanchez, Francisco J. Universidad Miguel Hernández de Elche; España.The purpose of this paper is to examine the influence of consumers’ perceived corporate social
responsibility (CSR). The aim is to provide insight into the effect of perceived CSR on purchase intention
(short-term effect) and corporate reputation (long-term effect), whilst considering the role of brand image,
satisfaction (affective and cognitive) and brand loyalty.https://www.emeraldinsight.com/doi/full/10.1108/EJMBE-12-2017-0068info:eu-repo/semantics/publishedVersionFil: Bianchi, Enrique Carlos. Universidad Nacional de Córdoba. Facultad de Ciencias Económicas. Departamento de Administración y Tecnología de la Información; Argentina.Fil: Bianchi, Enrique Carlos. Universidad Católica de Córdoba. Unidad Asociada al CONICET; Argentina.Fil: Bruno, Juan Manuel. Universidad Nacional de Córdoba. Facultad de Ciencias Económicas. Departamento de Administración y Tecnología de la Información; Argentina.Fil: Sarabia-Sanchez, Francisco J. Universidad Miguel Hernández de Elche; España.Negocios y Administració
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