2,286 research outputs found
Equivalence between two-dimensional alternating/random Ising model and the ground state of one-dimensional alternating/random XY chain
It is derived that the two-dimensional Ising model with alternating/random
interactions and with periodic/free boundary conditions is equivalent to the
ground state of the one-dimensional alternating/random XY model with the
corresponding periodic/free boundary conditions. This provides an exact
equivalence between a random rectangular Ising model, in which the
Griffiths-McCoy phase appears, and a random XY chain.Comment: 10 page
The sociology of pharmaceuticals: progress and prospects
This paper takes a critical look at progress and prospects regarding the sociology of pharmaceuticals over the years. Key themes examined include: (i) medicalisation and pharmaceuticalisation; (ii) regulation; (iii) consumption and consumerism; (iv) expectations and innovation. Papers in the monograph are also introduced and discussed in relation to these themes. The paper concludes with some further comments and reflections on progress and prospects in this field, emphasising the continuing importance of sociological engagement with these personal and political issues in the 21st century
Screening of the COL8A2 gene in an Australian family with early-onset Fuchs’ endothelial corneal dystrophy
This item is under embargo for a period of 12 months from the date of publication, in accordance with the publisher's policy
The MIDAS experiment: A prototype for the microwave emission of Ultra-High Energy Cosmic Rays
Recent measurements suggest that extensive air showers initiated by
ultra-high energy cosmic rays (UHECR) emit signals in the microwave band of the
electromagnetic spectrum caused by the collisions of the free-electrons with
the atmospheric neutral molecules in the plasma produced by the passage of the
shower. Such emission is isotropic and could allow the detection of air showers
with 100% duty cycle and a calorimetric-like energy measurement, a significant
improvement over current detection techniques. We have built MIDAS (MIcrowave
Detection of Air Showers), a prototype of microwave detector, which consists of
a 4.5 m diameter antenna with a cluster of 53 feed-horns in the 4 GHz range.
The details of the prototype and first results will be presented.Comment: To appear in the proceedings of 12th Topical Seminar on Innovative
Particle and Radiation Detectors (IPRD10), Siena, Italy, 7 - 10 June 201
The MIDAS telescope for microwave detection of ultra-high energy cosmic rays
We present the design, implementation and data taking performance of the
MIcrowave Detection of Air Showers (MIDAS) experiment, a large field of view
imaging telescope designed to detect microwave radiation from extensive air
showers induced by ultra-high energy cosmic rays. This novel technique may
bring a tenfold increase in detector duty cycle when compared to the standard
fluorescence technique based on detection of ultraviolet photons. The MIDAS
telescope consists of a 4.5 m diameter dish with a 53-pixel receiver camera,
instrumented with feed horns operating in the commercial extended C-Band (3.4
-- 4.2 GHz). A self-trigger capability is implemented in the digital
electronics. The main objectives of this first prototype of the MIDAS telescope
- to validate the telescope design, and to demonstrate a large detector duty
cycle - were successfully accomplished in a dedicated data taking run at the
University of Chicago campus prior to installation at the Pierre Auger
Observatory.Comment: 13 pages, 18 figure
Imaging the Black Hole Silhouette of M87: Implications for Jet Formation and Black Hole Spin
The silhouette cast by the horizon of the supermassive black hole in M87 can
now be resolved with the emerging millimeter very-long baseline interferometry
(VLBI) capability. Despite being ~2000 times farther away than SgrA* (the
supermassive black hole at the center of the Milky-Way and the primary target
for horizon-scale imaging), M87's much larger black hole mass results in a
horizon angular scale roughly half that of SgrA*'s, providing another practical
target for direct imaging. However, unlike SgrA*, M87 exhibits a powerful radio
jet, providing an opportunity to study jet formation physics on horizon scales.
We employ a simple, qualitatively correct force-free jet model to explore the
expected high-resolution images of M87 at wavelengths of 1.3mm and 0.87mm
(230GHz and 345GHz), for a variety of jet parameters. We show that future VLBI
data will be able to constrain the size of the jet footprint, the jet
collimation rate, and the black hole spin. Polarization will further probe the
structure of the jet's magnetic field and its effect on the emitting gas.
Horizon-scale imaging of M87 and SgrA* will enable for the first time the
empirical exploration of the relationship between the mass and spin of a black
hole and the characteristics of the gas inflow/outflow around it.Comment: 18 pages, 7 figures, accepted by Ap
President Lincoln and General Grant on Peace and War
The broadside is cream in color and features black ink. It contains an interview of Lincoln conducted by Mills. It also features a letter from Grant, and a poem by Taylor. The broadside has some damage to its corners and right side, but is in otherwise good condition.https://scholarsjunction.msstate.edu/fvw-ephemera/1018/thumbnail.jp
President Lincoln and General Grant on Peace and War
The broadside is cream in color and features black ink. It contains an interview of Lincoln conducted by Mills. It also features a letter from Grant, and a poem by Taylor. The broadside has some damage to its corners and right side, but is in otherwise good condition.https://scholarsjunction.msstate.edu/fvw-artifacts/1091/thumbnail.jp
Hydrogen-enhanced local plasticity in aluminum: an ab initio study
Dislocation core properties of Al with and without H impurities are studied
using the Peierls-Nabarro model with parameters determined by ab initio
calculations. We find that H not only facilitates dislocation emission from the
crack tip but also enhances dislocation mobility dramatically, leading to
macroscopically softening and thinning of the material ahead of the crack tip.
We observe strong binding between H and dislocation cores, with the binding
energy depending on dislocation character. This dependence can directly affect
the mechanical properties of Al by inhibiting dislocation cross-slip and
developing slip planarity.Comment: 4 pages, 3 figure
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