4,793 research outputs found
April 10, 2006 AASU Faculty Meeting Minutes
April 10, 2006 Armstrong Atlantic State University Faculty Meeting Minute
Gradient metasurfaces: a review of fundamentals and applications
In the wake of intense research on metamaterials the two-dimensional
analogue, known as metasurfaces, has attracted progressively increasing
attention in recent years due to the ease of fabrication and smaller insertion
losses, while enabling an unprecedented control over spatial distributions of
transmitted and reflected optical fields. Metasurfaces represent optically thin
planar arrays of resonant subwavelength elements that can be arranged in a
strictly or quasi periodic fashion, or even in an aperiodic manner, depending
on targeted optical wavefronts to be molded with their help. This paper reviews
a broad subclass of metasurfaces, viz. gradient metasurfaces, which are devised
to exhibit spatially varying optical responses resulting in spatially varying
amplitudes, phases and polarizations of scattered fields. Starting with
introducing the concept of gradient metasurfaces, we present classification of
different metasurfaces from the viewpoint of their responses, differentiating
electrical-dipole, geometric, reflective and Huygens' metasurfaces. The
fundamental building blocks essential for the realization of metasurfaces are
then discussed in order to elucidate the underlying physics of various physical
realizations of both plasmonic and purely dielectric metasurfaces. We then
overview the main applications of gradient metasurfaces, including waveplates,
flat lenses, spiral phase plates, broadband absorbers, color printing,
holograms, polarimeters and surface wave couplers. The review is terminated
with a short section on recently developed nonlinear metasurfaces, followed by
the outlook presenting our view on possible future developments and
perspectives for future applications.Comment: Accepted for publication in Reports on Progress in Physic
The Need For Academic Reform In Vietnamese Higher Education (VHE) To Align With Employers’ Expectations
The effort to comprehensively reform Vietnamese higher education (VHE) in order to produce an educated workforce better able to contribute to economic development is a major concern not only of educators and the Vietnamese government but also of employers, workers, and the general populace.
Successful implementation of VHE’s “Vision 2020” relies on legal change together with macro-policies to support these educational initiatives. For the purposes of this study, however, the author focused on the current state of VHE in providing employable graduates to meet the needs of Vietnam’s knowledge economy in the 21st century. In particular, through an analysis of the advanced training programs (ATPs), the author argues that the wider use and expansion of ATPs is the key to the academic reform necessary to meet the expectations of Vietnamese employers in the 21st century
Stochastic filtering under model ambiguity
In this paper, we study a non-linear filtering problem when the signal model
is uncertain. The model ambiguity is characterized by a class of probability
measures from which the true probability measure is taken. The optimal filter
can be estimated by converting to a conditional mean field optimal control
problem. In the first part of this article, we develop a general form
stochastic maximum principle for a conditional mean-field type model driven by
a forward and backward control system. In the second part, we characterize the
ambiguity filter and prove its existence and uniqueness
November 12, 2007 AASU Faculty Meeting Minutes
November 12, 2007 Armstrong Atlantic State University Faculty Meeting Minute
Open Educational Resource 2017 Textbook List
This is an updated, discipline specific OER textbook list for departments at Sacred Heart University, compiled by Zach Claybaugh and Chelsea Stone
Open Educational Resources Textbook List
Discipline specific OER textbook list for departments at SHU, compiled by Zach Claybaugh and Chelsea Stone
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