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Inhomogeneous Surface Plasmon Polaritons
Get PDFWe show analytically and with rigorous computa-
tional electrodynamics how inhomogeneous surface plasmon
polaritons (ISPPs) can be generated by refraction of ordinary
SPPs at metal−metal interfaces. ISPPs, in contrast with SPPs,
propagate and decay in different directions and can therefore
exhibit significantly different intensity patterns. Our analytical
arguments are based on a complex generalization of Snell’s law to
describe how SPPs moving on one metal surface are refracted at
an interface with a second, different metal surface. The refracted
waveform on the second metal is an ISPP. Under suitable circumstances the decay of an ISPP can be almost perpendicular to the propagation direction, leading to significant confinement. It is also found that ISPPs on the second metal can retain information about the SPPs on the first metal, a phenomenon that we term “dispersion imprinting”. The complex Snell’s law predictions are validated with 3-D finite-difference time-domain simulations, and possible means of experimentally observing ISPPs are suggested. The idea of ISPPs and how they result from refraction may expand the potential for designing the propagation and dispersion features of surface waves in general, including surface phonon polaritons, surface magnons, and guided waves in metamaterials
Vice Preseidents who failed to reach the White House; XVII - Garret Augustus Hobart
No full textShort biograpohy of G. A. Hobart with picture
Photograph of Mrs. David Hand
No full textB/W photograph of Mrs. David Hand in a black dress sitting in a chair
A Conceptual Investigation: Towards an Integrative Perspective of Risks in Information Systems Development & Usage
Get PDFIn the Proceedings of the 8th Annual Symposium on Information Assurance (ASIA '13), June 4-5, 2013, Empire State Plaza, Albany, NY. https://www.albany.edu/iasymposium/proceedings.2013.shtmlA review of existing literature in academia and in profession, along with real cases, reveals a fragmented approach to risk identification and management in information systems development and usage (ISDU). Such a disjointed approach to risk management fails to consider critical threat components and under evaluates the maximum potential risks involved in a situation. The present study argues that ISDU Risks need to be expansively identified and perceived in an integrative manner. The views generally exercised by IS researcher's, within the limited attention provided to risk, are segmented and microscopic with no defined risk ecosystem to place them in . So also, practitioner groups have been individualistically producing IS artifacts for risk mitigation with a primary purpose of creating significant ROI, adding to fragmented perspectives on ISDU risks. We observe significantly high failure rates for IS projects, in spite of the claims of the application of highly advanced risk management models. In any domain, the presence of an abnormally high rate of failure would imply an absence of successful risk management and imply that not all significant risks have been accounted for. The present study identifies various cross-domain risk measures and risk constructs with macro-level relevance to the ISDU ecosystem. Based on literature review and observational reflections, a taxonomy for the classification of types of risks is presented. The present paper is an attempt at expanding the portfolio of risk concepts associated with ISDU and posits an early stage high-level integrative risk perception framework that will represent various cross-domain measures and dimensions of risk in an integrative manner. This theoretical contribution and its continued development is expected to initiate additional scholarly work on integrative perspectives on risks and new dimensions of risks associated with IS, open up a new stream of risk-related research in IS and lead to the development of enhanced risk management models
Characterizing a middle school student's engagement in a mathematics class
Get PDFThis paper was presented at the Eighth Congress of European Research in Mathematics Education (CERME8) in Antalya, Turkey.This study builds on previous work that investigates the nature of engagement as it occurs ‘in the moment’ by using the concept of engagement structures (Goldin, Epstein, Schorr and Warner, 2011). In this paper, we report on a young male student, Eric, who called out an answer in response to a question posed by the teacher. He noted that he wanted to impress the others in the class. His solution was immediately challenged by his peers, whereupon, he became defensive and withdrew from the discussion. We attempt to characterize this shift in engagement using the theoretical concept of engagement structures as a way to explain his reactions
Memo regarding a letter from Garret A. Hobart's grandaughter.
No full textA memo regarding a letter from Garret A. Hobart's grandaughter. Memo is addressed to Maureen