We study the electronic instabilities of near 1/4 electron doped graphene using the singular-mode functional renormalization group, with a self-adaptive k-mesh to improve the treatment of the van Hove singularities, and variational Monte-Carlo method. At 1/4 doping the system is a chiral spin density wave state exhibiting the anomalous quantized Hall effect. When the doping drops below 1/4, the d x 2 −y 2 + idxy Cooper pairing becomes the leading instability. Our results suggest that near 1/4 electron-or hole-doping (away from the neutral point) the graphene is either a Chern insulator or a topoligical superconductor.

In several recent experiments the superconducting gap of a single-unit-cell-thick FeSe film on SrTiO 3 substrate has been observed by scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy. The value of the superconducting gap is about nine times larger than that of the bulk FeSe under ambient pressure, suggesting a much higher pairing energy scale and T c than all other iron-based superconductors and thus calling for a better understanding of its superconducting mechanism. In this paper we study the effects of screening due to the SrTiO 3 ferroelectric phonons on Cooper pairing in FeSe. We conclude that it can significantly enhance the energy scale of Cooper pairing and even change the pairing symmetry. Our results also raise some concerns on whether phonons can be completely ignored for bulk iron-based superconductors.

This review provides a current perspective of invasive and noninvasive ICP measurements, along with a sense of their relative strengths, drawbacks and areas for further improvement. At present, none of the noninvasive methods demonstrates sufficient accuracy and ease of use while allowing continuous monitoring in routine clinical use. However, they provide a realizable ICP measurement in specific patients especially when invasive monitoring is contraindicated or unavailable. Among all noninvasive ICP measurement methods, ONSD and TCD are attractive and may be useful in selected settings though they cannot be used as invasive ICP measurement substitutes. For a sufficiently accurate and universal continuous ICP monitoring method/device, future research and developments are needed to integrate further refinements of the existing methods, combine telemetric sensors and/or technologies, and validate large numbers of clinical studies on relevant patient populations.

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A new type of photodegradable low-density polyethylene (LDPE)-TiO2 nanocomposite film was prepared by a melt blending technique. The photocatalytic degradation of the LDPE-TiO2 nanocomposites was investigated. The as-prepared films were characterized by scanning electron microscopy (SEM), high-temperature gel permeation chromatography (HT-GPC), X-ray photoelectron spectroscopy (XPS), FT-IR spectroscopy, and the photoinduced weight loss. The results show that the LDPE-TiO2 nanocomposite films could be efficiently degraded under UV or sunlight illumination. The weight loss rate of the composite film reached 68.38%, the average molecular weight (Mw) of the composite film decreased 94.56%, and the number of average molecular weight (Mn) decreased 93.75% after UV-light irradiation for 400 h. FT-IR and XPS analysis indicated that the LDPE was oxidized during UV-light irradiation. The photocatalytic degradation mechanism of the films is briefly discussed.