4,793 research outputs found

    April 10, 2006 AASU Faculty Meeting Minutes

    Get PDF
    April 10, 2006 Armstrong Atlantic State University Faculty Meeting Minute

    Gradient metasurfaces: a review of fundamentals and applications

    Full text link
    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

    Get PDF
    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

    Full text link
    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

    Get PDF
    November 12, 2007 Armstrong Atlantic State University Faculty Meeting Minute

    Open Educational Resource 2017 Textbook List

    Get PDF
    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

    Get PDF
    Discipline specific OER textbook list for departments at SHU, compiled by Zach Claybaugh and Chelsea Stone
    • …
    corecore