Plethodon petraeus

Number of Pages: 2Integrative BiologyGeological Science

A Holographic Fractional Topological Insulator

We give a holographic realization of the recently proposed low energy effective action describing a fractional topological insulator. In particular we verify that the surface of this hypothetical material supports a fractional quantum Hall current corresponding to half that of a Laughlin state.Comment: 4 pages, 2 figure

Physical Wigner functions

In spite of their potential usefulness, the characterizations of Wigner functions for Bose and Fermi statistics given by O'Connell and Wigner himself almost thirty years ago has drawn little attention. With an eye towards applications in quantum chemistry, we revisit and reformulate them in a more convenient way.Comment: Latex, 10 page

Scaler mode of the Auger Observatory and Sunspots

Recent data from the Auger Observatory on low energy secondary cosmic ray particles are analyzed to study temporal correlations together with data on the daily sunspot numbers and neutron monitor data. Standard spectral analysis demonstrates that the available data shows 1/f^{\beta} fluctuations with {\beta} approximately 1 in the low frequency range. All data behave like Brownian fluctuations in the high frequency range. The existence of long-range correlations in the data was confirmed by detrended fluctuation analysis. The real data confirmed the correlation between the scaling exponent of the detrended analysis and the exponent of the spectral analysis.Comment: 20 pages, 6 figures, to be published in Astrophysical Journal Supplement Serie

2018 IEEE IUS SA-VFI Challenge

The 2018 IEEE IUS SA-VFI challenge consist on estimating blood flow velocities from both simulated and measured ultrasound RF element data sets. The challenge results are meant to be presented during the next IEEE International Ultrasonics Symposium 2018 in Kobe (Japan). The data sets for the challenge consist on pre-beamformed RF element signals using a pre-selected synthetic aperture (SA) sequence on flow phantoms, both simulations and experiments. The details of the provided data sets and example code is given in the main document "2018_IEEE_IUS_SA-VFI_Challenge.pdf". A website for the participants with additional information is available at https://www.creatis.insa-lyon.fr/Challenge/IEEE_IUS_2018/

Expanding Greenland seagrass meadows contribute new sediment carbon sinks

The loss of natural carbon sinks, such as seagrass meadows, contributes to grenhouse gas emissions and, thus, global warming. Whereas seagrass meadows are declining in temperate and tropical regions, they are expected to expand into the Arctic with future warming. Using paleoreconstruction of carbon burial and sources of organic carbon to shallow coastal sediments of three Greenland seagrass (Zostera marina) meadows of contrasting density and age, we test the hypothesis that Arctic seagrass meadows are expanding along with the associated sediment carbon sinks. We show that sediments accreted before 1900 were highly 13C depleted, indicative of low inputs of seagrass carbon, whereas from 1940’s to present carbon burial rates increased greatly and sediment carbon stocks were largely enriched with seagrass material. Currently, the increase of seagrass carbon inputs to sediments of lush and dense meadows (Kapisillit and Ameralik) was 2.6 fold larger than that of sparse meadows with low biomass (Kobbefjord). Our results demonstrate an increasing important role of Arctic seagrass meadows in supporting sediment carbon sinks, likely to be enhanced with future Arctic warming