23,972 research outputs found
The imperial war museum’s social interpretation project
This report represents the output from research undertaken by University of Salford and MTM
London as part of the joint Digital R&D Fund for Arts and Culture, operated by Nesta, Arts
Council England and the AHRC. University of Salford and MTM London received funding from
the programme to act as researchers on the Social Interpretation (SI) project, which was led by
the Imperial War Museum (IWM) and their technical partners, The Centre for Digital
Humanities, University College London, Knowledge Integration, and Gooii. The project was
carried out between October 2011 and October 2012
Free-space quantum key distribution
A working free-space quantum key distribution (QKD) system has been developed
and tested over a 205-m indoor optical path at Los Alamos National Laboratory
under fluorescent lighting conditions. Results show that free-space QKD can
provide secure real-time key distribution between parties who have a need to
communicate secretly.Comment: 5 pages, 2 figures, 2 tables. To be published in Physical review A on
or about 1 April 199
First Results from SPARO: Evidence for Large-Scale Toroidal Magnetic Fields in the Galactic Center
We have observed the linear polarization of 450 micron continuum emission
from the Galactic center, using a new polarimetric detector system that is
operated on a 2 m telescope at the South Pole. The resulting polarization map
extends ~ 170 pc along the Galactic plane and ~ 30 pc in Galactic latitude, and
thus covers a significant fraction of the central molecular zone. Our map shows
that this region is permeated by large-scale toroidal magnetic fields. We
consider our results together with radio observations that show evidence for
poloidal fields in the Galactic center, and with Faraday rotation observations.
We compare all of these observations with the predictions of a magnetodynamic
model for the Galactic center that was proposed in order to explain the
Galactic Center Radio Lobe as a magnetically driven gas outflow. We conclude
that the observations are basically consistent with the model.Comment: 11 pages, 2 figures, 1 table, submitted to ApJ Let
Seasonal contrasts in the diel vertical distribution, feeding behavior, and grazing impact of the copepod Temora Longicornis in Long Island Sound
We studied diel variability in vertical distribution, feeding behavior and grazing impact of female Temora longicornis in Long Island Sound on seven cruises from March to July. T. longicornis usually performed diel vertical migration characterized by deep residence during the day and ascent to near-surface waters at night for variable periods. The pattern of diel migration was independent of either the vertical distribution or relative abundance of chlorophyll in the water column. There was no clear evidence linking the amplitude of vertical migration to food concentration. Rather, the amplitude of migration decreased toward the end of the season probably due to animals avoiding warm waters (\u3e 17°C) near the surface. Gut pigment content showed diel variation characterized by maximum values during the nighttime. However, the estimated mean ingestion rate from the nighttime period was significantly greater than that of the daytime period in only 2 of 11 comparisons indicating that this copepod usually fed throughout the day at about the same rate. The shape of the diel curve was usually similar for females at 5 and 20 m. Usually there was no difference in gut content of females with depth even when differences in chlorophyll with depth were pronounced. Therefore, the diel variability in gut content was unlikely to result from continuous feeding in a vertically stratified food environment. Short-term (hourly) changes in chlorophyll concentration could not entirely account for changes in gut content over a diel cycle. We estimate that female T. longicornis removed daily \u3c 1–34% of the phytoplankton stock and \u3c 1–49% of the primary production in Long Island Sound. Estimates of daily carbon rations indicate that a herbivorous diet can satisfy the metabolic requirements and support egg production of T. longicornis throughout most of its season
A Variational Approach for Minimizing Lennard-Jones Energies
A variational method for computing conformational properties of molecules
with Lennard-Jones potentials for the monomer-monomer interactions is
presented. The approach is tailored to deal with angular degrees of freedom,
{\it rotors}, and consists in the iterative solution of a set of deterministic
equations with annealing in temperature. The singular short-distance behaviour
of the Lennard-Jones potential is adiabatically switched on in order to obtain
stable convergence. As testbeds for the approach two distinct ensembles of
molecules are used, characterized by a roughly dense-packed ore a more
elongated ground state. For the latter, problems are generated from natural
frequencies of occurrence of amino acids and phenomenologically determined
potential parameters; they seem to represent less disorder than was previously
assumed in synthetic protein studies. For the dense-packed problems in
particular, the variational algorithm clearly outperforms a gradient descent
method in terms of minimal energies. Although it cannot compete with a careful
simulating annealing algorithm, the variational approach requires only a tiny
fraction of the computer time. Issues and results when applying the method to
polyelectrolytes at a finite temperature are also briefly discussed.Comment: 14 pages, uuencoded compressed postscript fil
Active Galaxies and Cluster Gas
Two lines of evidence indicate that active galaxies, principally radio
galaxies, have heated the diffuse hot gas in clusters. The first is the general
need for additional heating to explain the steepness of the X-ray
luminosity--temperature relation in clusters, the second is to solve the
cooling flow problem in cluster cores. The inner core of many clusters is
radiating energy as X-rays on a timescale much shorter than its likely age.
Although the temperature in this region drops by a factor of about 3 from that
of the surrounding gas, little evidence is found for gas much cooler than that.
Some form of heating appears to be taking place, probably by energy transported
outward from the central accreting black hole or radio source. How that energy
heats the gas depends on poorly understood transport properties (conductivity
and viscosity) of the intracluster medium. Viscous heating is discussed as a
possibility. Such heating processes have consequences for the truncation of the
luminosity function of massive galaxies.Comment: 14 pages, 16 fig, Feb 2004 talk for Phil Trans Roy So
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Perceptions of unsolicited electronic mail or spam
The proliferation of unsolicited electronic mail or spam is becoming a global concern for many organizations. This paper explores perceptions of unsolicited email, its impact on personal productivity, the question of whether spam is an invasion of privacy, the perceived need to control spam, and the effectiveness of unsolicited email. The results clearly show that while the respondents find spam annoying, they spend very little time in dealing with it. Although the respondents express the need to control spam, they do not believe that governmental control is the solution, but rather that Internet Service Providers and organizations should take the responsibility for controlling unsolicited email. Lastly, the respondents are very unlikely to open, let alone read, and respond to unsolicited email. The results of this study will be useful for guiding organizational, university, and public policies
Advanced propellant management system for spacecraft propulsion systems. Phase 1 - Survey study and evaluation
Apollo spacecraft propulsion system propellant managemen
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