Double-layer Perfect Metamaterial Absorber and Its Application for RCS Reduction of Antenna

To reduce the radar cross section (RCS) of a circularly polarized (CP) tilted beam antenna, a double-layer perfect metamaterial absorber (DLPMA) in the microwave frequency is proposed. The DLPMA exhibits a wider band by reducing the distance between the three absorption peaks. Absorbing characteristics are analyzed and the experimental results demonstrate that the proposed absorber works well from 5.95 GHz to 6.86 GHz (relative bandwidth 14.1%) with the thickness of 0.5 mm. Then, the main part of perfect electric conductor ground plane of the CP tilted beam antenna is covered by the DLPMA. Simu¬lated and experimental results reveal that the novel antenna performs well from 5.5 GHz to 7 GHz, and its monostatic RCS is reduced significantly from 5.8 GHz to 7 GHz. The agreement between measured and simulated data validates the present design

Andreev Edge State on Semi-Infinite Triangular Lattice: Detecting the Pairing Symmetry in Na_0.35CoO_2.yH_2O

We study the Andreev edge state on the semi-infinite triangular lattice with different pairing symmetries and boundary topologies. We find a rich phase diagram of zero energy Andreev edge states that is a unique fingerprint of each of the possible pairing symmetries. We propose to pin down the pairing symmetry in recently discovered Na_xCoO_2 material by the Fourier-transformed scanning tunneling spectroscopy for the edge state. A surprisingly rich phase diagram is found and explained by a general gauge argument and mapping to 1D tight-binding model. Extensions of this work are discussed at the end.Comment: 4 pages, 1 table, 4 figure

Fake View Analytics in Online Video Services

Online video-on-demand(VoD) services invariably maintain a view count for each video they serve, and it has become an important currency for various stakeholders, from viewers, to content owners, advertizers, and the online service providers themselves. There is often significant financial incentive to use a robot (or a botnet) to artificially create fake views. How can we detect the fake views? Can we detect them (and stop them) using online algorithms as they occur? What is the extent of fake views with current VoD service providers? These are the questions we study in the paper. We develop some algorithms and show that they are quite effective for this problem.Comment: 25 pages, 15 figure

Practitioners\u27 Perpectives on the Impact of Migratory Separation on Attachment Among Southeast Asian Clients: An Exploratory Study

Evidenced by the multitude of literature across disciplines, attachment theory has ignited one of today’s most prolific lines of research. Attachment Theory’s core themes of security, separation, and loss apply well into the common experience of immigrants and refugees who have dealt with these issues in their immigration experience. Consistently, studies have shown that separation and traumas before, during, and after the migration journey have been identified as potential predictors for serious psychological distress and mental health problems among immigrants and refugees. Given the profound implications from recent studies, there exists limited research on how migratory separation affects attachment. Thus, the goal of this exploratory research was to examine the variables of separation and attachment by using both quantitative and qualitative research methodologies to investigate mental health professionals’ perspectives on the impact of separation due to immigration on attachment related issues among Southeast Asian clients. Further, to gather mental health implications and recommendations on culturally sensitive practices. The sample was comprised of fourteen mental health professionals who work predominantly with Southeast Asian immigrant and refugee populations. The participants provided insightful observations on the complex relationship between attachment and separation due to immigration among Southeast Asian diaspora populations. Most notably, they described common challenges, Eastern cultural lens of attachment, and offered intervention recommendations for working with this client populations. This study brings awareness to mental health professionals everywhere of the multifaceted effects separation can have on immigrant and refugees’ well-being and to call for appropriate interventions to assure effective, ethical, and adequate service for this growing populations in our nations and in the Twin Cities metro area