145 research outputs found
Dedication in Memory of William Dewey Rollison
William Dewey Rollison, Professor of Law Emeritus: University of Notre Dame 1897-197
Contributors to the December Issue/Notes
Notes by Robert A. Oberfell, charles M. Boynton, Theodore M. Ryan, William J. O\u27Connell, David S. Landis, Francis J. Paulson, Robert A. Oberfell, and Hal E. Hunter, Jr
Contributors to the December Issue/Notes
Notes by Robert A. Oberfell, charles M. Boynton, Theodore M. Ryan, William J. O\u27Connell, David S. Landis, Francis J. Paulson, Robert A. Oberfell, and Hal E. Hunter, Jr
Predicting the Starquakes in PSR J0537-6910
We report on more than 7 years of monitoring of PSR J0537-6910, the 16 ms
pulsar in the Large Magellanic Cloud, using data acquired with the RXTE. During
this campaign the pulsar experienced 23 sudden increases in frequency
(``glitches'') amounting to a total gain of over six ppm of rotation frequency
superposed on its gradual spindown of d(nu)/d(t) = -2e-10 Hz/s. The time
interval from one glitch to the next obeys a strong linear correlation to the
amplitude of the first glitch, with a mean slope of about 400 days ppm (6.5
days per uHz), such that these intervals can be predicted to within a few days,
an accuracy which has never before been seen in any other pulsar. There appears
to be an upper limit of ~40 uHz for the size of glitches in_all_ pulsars, with
the 1999 April glitch of J0537 as the largest so far. The change in the
spindown of J0537 across the glitches, Delta(d(nu)/d(t)), appears to have the
same hard lower limit of -1.5e-13 Hz/s, as, again, that observed in all other
pulsars. The spindown continues to increase in the long term,
d(d(nu)/d(t))/d(t) = -1e-21 Hz/s/s, and thus the timing age of J0537 (-0.5 nu
d(nu)/d(t)) continues to decrease at a rate of nearly one year every year,
consistent with movement of its magnetic moment away from its rotational axis
by one radian every 10,000 years, or about one meter per year. J0537 was likely
to have been born as a nearly-aligned rotator spinning at 75-80 Hz, with a
|d(nu)/d(t)| considerably smaller than its current value of 2e-10 Hz/s. The
pulse profile of J0537 consists of a single pulse which is found to be flat at
its peak for at least 0.02 cycles.Comment: 54 pages, 12 figures. Accepted for publication in The Astrophysical
Journal. Cleaner figure 2. V4 -- in line with version accepted by Ap
The ABC130 barrel module prototyping programme for the ATLAS strip tracker
For the Phase-II Upgrade of the ATLAS Detector, its Inner Detector,
consisting of silicon pixel, silicon strip and transition radiation
sub-detectors, will be replaced with an all new 100 % silicon tracker, composed
of a pixel tracker at inner radii and a strip tracker at outer radii. The
future ATLAS strip tracker will include 11,000 silicon sensor modules in the
central region (barrel) and 7,000 modules in the forward region (end-caps),
which are foreseen to be constructed over a period of 3.5 years. The
construction of each module consists of a series of assembly and quality
control steps, which were engineered to be identical for all production sites.
In order to develop the tooling and procedures for assembly and testing of
these modules, two series of major prototyping programs were conducted: an
early program using readout chips designed using a 250 nm fabrication process
(ABCN-25) and a subsequent program using a follow-up chip set made using 130 nm
processing (ABC130 and HCC130 chips). This second generation of readout chips
was used for an extensive prototyping program that produced around 100
barrel-type modules and contributed significantly to the development of the
final module layout. This paper gives an overview of the components used in
ABC130 barrel modules, their assembly procedure and findings resulting from
their tests.Comment: 82 pages, 66 figure
Creating and curating an archive: Bury St Edmunds and its Anglo-Saxon past
This contribution explores the mechanisms by which the Benedictine foundation of Bury St Edmunds sought to legitimise and preserve their spurious pre-Conquest privileges and holdings throughout the Middle Ages. The archive is extraordinary in terms of the large number of surviving registers and cartularies which contain copies of Anglo-Saxon charters, many of which are wholly or partly in Old English. The essay charts the changing use to which these ancient documents were put in response to threats to the foundation's continued enjoyment of its liberties. The focus throughout the essay is to demonstrate how pragmatic considerations at every stage affects the development of the archive and the ways in which these linguistically challenging texts were presented, re-presented, and represented during the Abbey’s history
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