Discrete Torsion and WZW Orbifolds

We propose a geometrical interpretation for the discrete torsion appearing in the algebraic formulation of quotients of WZW models by discrete abelian subgroups. Part of the discrete torsion corresponds to the choice of action of the subgroup, yielding different quotient spaces. Another part corresponds to the set of different choices of connection for the H field in each of these spaces. The former is for instance used to describe generalized lens spaces L(n,p).Comment: 11 pages, no figures; references added, typos correcte

The impact of diabetes on employment in Mexico

This study explores the impact of diabetes on employment in Mexico using data from the Mexican Family Life Survey (MxFLS) (2005), taking into account the possible endogeneity of diabetes via an instrumental variable estimation strategy. We find that diabetes significantly decreases employment probabilities for men by about 10 percentage points (

Rietveld refinement of Y2GeO5

Y2GeO5 (yttrium germanium penta­oxide) was synthesized by solid-state reaction at 1443 K. The arrangement, which has monoclinic symmetry, is isostructural with Dy2GeO5 and presents two independent sites for the Y atoms. Around these atoms there are distorted six-coordinated YO6 octa­hedra and seven-coordinated YO7 penta­gonal bipyramids. The YO7 polyhedra are linked together, sharing their edges along a surface parallel to ab, forming a sheet. Each of these parallel sheets is inter­connected by means of GeO4 tetra­hedra, sharing an edge (or vertex) on one side and a vertex (or edge) on the other adjacent side. Parallel sheets of YO7 polyhedra are also inter­connected by undulating chains of YO6 octa­hedra along the c axis. These octa­hedra are joined together, sharing a common edge, to form the chain and share edges with the YO7 polyhedra of the sheets

In vivo imaging of unstained tissues using long gradient index lens multiphoton endoscopic systems

We characterize long (up to 285 mm) gradient index (GRIN) lens endoscope systems for multiphoton imaging. We fabricate a portable, rigid endoscope system suitable for imaging unstained tissues, potentially deep within the body, using a GRIN lens system of 1 mm diameter and 8 cm length. The portable device is capable of imaging a ~200 µm diameter field of view at 4 frames/s. The lateral and axial resolution in water is 0.85 µm and 7.4 µm respectively. In vivo images of unstained tissues in live, anesthetized rats using the portable device are presented. These results show great promise for GRIN endoscopy to be used clinically

X-ray \u3cem\u3eSwift\u3c/em\u3e Observations of SN 2018cow

Supernova (SN) 2018cow is an optical transient detected in the galaxy CGCG 137–068. It has been classified as a SN due to various characteristics in its optical spectra. The transient is also a bright X-ray source. We present results of the analysis of ∼ 62 ks of X-ray observations taken with the Neil Gehrels Swift Observatory over 27 days. We found a variable behavior in the 0 . 3 − 10 keV X-ray light curve of SN 2018cow, with variability timescales of days. The observed X-ray variability could be due to the interaction between the SN ejecta and a non-uniform circum-stellar medium, perhaps related to previous mass ejections from a luminous-blue-variable-like progenitor

Józef Borodzicz, Na rusi gallicyjskiej Schyzma sie gotuje, Drukar Maryi Ziembińskiej, Chrzanowie, 1911.

Several research studies have argued that people evaluate incivilities of places as part of the process of estimating how safe they might be. The study presented here examined whether such an assumption is upheld when people are allowed to express their thoughts about places before rating how disordered a place seems to them. British students evaluated three residential areas with different levels of disorder. First, participants had to write their impressions about the places and then rate how disordered, risky and unsafe the places seemed to them. The qualitative analysis showed that despite participants referred to physical disorder, only few participants mentioned crime and safety. Results from the quantitative analysis revealed that as the more disordered a place was rated the more unsafe it was considered. Findings suggest both that disordered places not always elicit unsafe concerns and that the so predicted relationship between disorder and safety maybe method dependant

The Grizzly, October 30, 2014

Board Announces National Search for New President • Residents Relocated After Fire • Clubs Host First Ever Festifall • Yik Yak Exposes Use of Fake IDs • Midterm Elections Approaching • Halloween Compared to Other International Holidays • UC Alumni Return • Viewers are Drawn to Colonial Theatre in Phoenixville • Student Interns at Disney World • Opinion: Must Halloween Costumes for Women be Sexy?; Occupy Movement in Hong Kong Persists • Local Athlete Stong Giving Field Hockey a Scoring Spark • Diving Into 2014-15 Slate • Seri-ously Goodhttps://digitalcommons.ursinus.edu/grizzlynews/1914/thumbnail.jp

Light-induced disassembly of dusty bodies in inner protoplanetary discs: implications for the formation of planets

Laboratory experiments show that a solid-state greenhouse effect in combination with thermophoresis can efficiently erode a dust bed in a low-pressure gaseous environment. The surface of an illuminated, light absorbing dusty body is cooler than the dust below the surface (solidstate greenhouse effect). This temperature gradient leads to a directed momentum transfer between gas and dust particles and the dust particles are subject to a force towards the surface(thermophoresis). If the thermophoretic force is stronger than gravity and cohesion, dust particles are ejected. Applied to protoplanetary discs, dusty bodies smaller than several kilometres in size which are closer to a star than about 0.4 au are subject to a rapid and complete disassembly to submillimetre size dust aggregates by this process. While an inward-drifting dusty body is destroyed, the generated dust is not lost for the disc by sublimation or subsequent accretion on to the star but can be reprocessed by photophoresis or radiation pressure. Planetesimals cannot originate through aggregation of dust inside the erosion zone. If objects larger than several kilometres already exist, they prevail and further grow by collecting dust from disassembled smaller bodies. The pile-up of solids in a confined inner region of the disc, in general, boosts the formation of planets. Erosion is possible in even strongly gas-depleted inner regions as observed for TW Hya. Reprocessing of dust through light-induced erosion offers one possible explanation for growth of large cores of gas-poor giant planets in a gas-starved region as recently found around HD 149026b