5,472 research outputs found
wakefield: wakefield 0.1.0
No full text<a class="anchor" href="#news"><span class="octicon octicon-link"></span></a>NEWS
<a class="anchor" href="#versioning"><span class="octicon octicon-link"></span></a>Versioning
<p>Releases will be numbered with the following semantic versioning format:</p>
<p><major>.<minor>.<patch></p>
<p>And constructed with the following guidelines:</p>
<ul>
<li>Breaking backward compatibility bumps the major (and resets the minor
and patch)</li>
<li>New additions without breaking backward compatibility bumps the minor
(and resets the patch)</li>
<li>Bug fixes and misc changes bumps the patch</li>
</ul>
<a class="anchor" href="#wakefield-010"><span class="octicon octicon-link"></span></a>wakefield 0.1.0
<p><b>BUG FIXES</b></p>
<ul>
<li>
employment was misspelled as empoyment. Caught by Danilo Freire (<a href="https://github.com/trinker/wakefield/issues/2">issue #2</a>).</li>
</ul>
<p><b>NEW FEATURES</b></p>
<ul>
<li><p>r_list & r_data_frame now add a suffix to repeat variable names in a
sensible way. The separator is controlled by rep.sep. Suggested by
Ananda Mahto. See <a href="https://github.com/trinker/wakefield/issues/1">issue #1</a> for details.</p></li>
<li><p>r_list and r_data_frame can utilize r_series and r_dummy to produce
series of variables. Suggested by Ananda Mahto. See <a href="https://github.com/trinker/wakefield/issues/1">issue #1</a> for details.</p></li>
<li><p>r_series added to produce a series of grouped data. This is useful for
simulating repeated measures or survey questions. Suggested by Ananda Mahto.
See <a href="https://github.com/trinker/wakefield/issues/1">issue #1</a> for details.</p></li>
<li><p>as_integer added as a means of coercing all columns of a factor
data.frame to integers.</p></li>
<li><p>r_dummy added to produce multiple dummy columns from a single factor.</p></li>
<li><p>dob and birth functions added for date of birth variable.</p></li>
<li><p>peek added to allow a truncated head inspection of all columns of a
data.frame.</p></li>
<li><p>table_heat & plot.tbl_df added to visualize column types & NAs.</p></li>
<li><p>r_insert added to safely insert data.frames into a r_data_frame or
r_list object.</p></li>
</ul>
<p><b>MINOR FEATURES</b></p>
<ul>
<li>
seriesname function added to give a data.frame an attribute seriesname.
Typicaly this is for internal use.</li>
</ul>
<p>IMPROVEMENTS</p>
<p><b>CHANGES</b></p>
<a class="anchor" href="#wakefield-001"><span class="octicon octicon-link"></span></a>wakefield 0.0.1
<p>This package is designed to generates random data sets including: data.frames,
lists, and vectors.</p>
Medicine and society in Wakefield and Huddersfield, 1780-1870
No full textThe thesis examines the formation and evolution of medical
provisions in Wakefield and Huddersfield between circa 1780 and
1870. The survey covers 'institutional' facilities, namely hospital and dispensary provisions and Poor Law medical services,
friendly society facilities for the sick and the development of
'fringe' or 'peripheral' medical practices. The thesis also
discusses the structural, professional and social development of
medical communities in the two towns.
A wide range of source material was utilised, to include
Poor Law material (pre- and post-1834), the records of friendly
societies and medical charities census returns, newspapers, trade
and medical directories and parliamentary reports and returns.
The use of such a combination of material gives a better indication
of the range of facilities available and their relative importance.
It will be suggested that the emphasis medical historians have
put on institutional provisions has been misplaced. The importance
of previously neglected options, the friendly society and 'peripheral'
forms of treatment, will be stressed. Leading on from this,
it is possible to suggest that self-help forms of medical relief
(compared with those 'provided' by the wealthy classes for the poor)
were of greater significance-than has previously been assumed.
An attempt has been made to place the development of medical
services against the backdrop of the communities that they evolved in.
The growth of institutional provisions and the progress of self-help
forms are linked to the organisation of the two communities, their
class structure and social, civic and economic developments. The
leading role of laymen in creating a demand for, and in the setting
up and evolution of, medical provisions has also been stressed.
It is hoped an analysis of these factors will lead to a clearer
understanding of how and why medical facilities developed-as they
did, and to a greater insight into the relationships between medicine
and society
Near-threshold electron injection in the laser-plasma wakefield accelerator leading to femtosecond bunches
No full textWe gratefully acknowledge the support of the UK EPSRC (grant no. EP/J018171/1), the EU FP7 programmes: the Extreme Light Infrastructure (ELI) project, the Laserlab-Europe (no. 284464), and the EUCARD-2 project (no. 312453).The laser-plasma wakefield accelerator is a compact source of high brightness, ultra-short duration electron bunches. Self-injection occurs when electrons from the background plasma gain sufficient momentum at the back of the bubble-shaped accelerating structure to experience sustained acceleration. The shortest duration and highest brightness electron bunches result from self-injection close to the threshold for injection. Here we show that in this case injection is due to the localized charge density build-up in the sheath crossing region at the rear of the bubble, which has the effect of increasing the accelerating potential to above a critical value. Bunch duration is determined by the dwell time above this critical value, which explains why single or multiple ultra-short electron bunches with little dark current are formed in the first bubble. We confirm experimentally, using coherent optical transition radiation measurements, that single or multiple bunches with femtosecond duration and peak currents of several kiloAmpere, and femtosecond intervals between bunches, emerge from the accelerator.Peer reviewe
Plasma wakefield accelerators
No full textEdda Gschwendtner and Patric Muggli discuss the concept of plasma wakefield acceleration and
its potential for future particle colliders and other applications
An ultrashort pulse ultra-violet radiation undulator source driven by a laser plasma wakefield accelerator
No full textNarrow band undulator radiation tuneable over the wavelength range of 150–260 nm has been produced by short electron bunches from a 2 mm long laser plasma wakefield accelerator based on a 20 TW femtosecond laser system. The number of photons measured is up to 9 × 106 per shot for a 100 period undulator, with a mean peak brilliance of 1 × 1018 photons/s/mrad2/mm2/0.1% bandwidth. Simulations estimate that the driving electron bunch r.m.s. duration is as short as 3 fs when the electron beam has energy of 120–130 MeV with the radiation pulse duration in the range of 50–100 fs
Pepper-pot emittance measurement of laser-plasma wakefield accelerated electrons
No full textThe transverse emittance is an important parameter governing the brightness of an electron beam. Here we present the first pepper-pot measurement of the transverse emittance for a mono-energetic electron beam from a laser-plasma wakefield accelerator, carried out on the Advanced Laser-Plasma High Energy Accelerators towards X-Rays (ALPHA-X) beam line. Mono-energetic electrons are passed through an array of 52 mu m diameter holes in a tungsten mask. The pepper-pot results set an upper limit for the normalised emittance at 5.5 +/- 1 pi mm mrad for an 82 MeV beam
An investigation into the efficacy of methods commonly employed by mix engineers to reduce frequency masking in the mixing of multitrack musical recordings
No full textStudio engineers use a variety of techniques to reduce frequency masking between instruments when mixing multi-track musical recordings. This study evaluates the efficacy of three techniques, namely mirrored equalization, frequency spectrum sharing and stereo panning, against their variations to confirm the veracity of accepted practice. Mirrored equalisation involves boosting one instrument and cutting the other at the same frequency. Frequency spectrum sharing involves low pass filtering one instrument and high pass filtering the other. Panning involves placing two competing instruments at different pan positions. Test subjects used eight tools comprising a single unlabeled slider to reduce frequency masking in several two instrument scenarios. Satisfaction values were recorded. Results indicate subjects preferred using tools that panned both audio tracks
John D. Wakefield
No full textMarietta College Baseball Team; photograph of baseball player in uniform. John D. Wakefield? See team photo (Mariettana, 1927, p. 202)
Francis, John Wakefield
No full textA carte-de-visite card of John Wakefield Francis, 1789-1861, an American author and physician.https://digitalcommons.lmunet.edu/allmcdv/1190/thumbnail.jp
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