121 research outputs found
Data communications and networking / Behrouz A. Forouzan with Sophia Chung Fegan.
No full textIncludes bibliographical references (p. 1107-1110) and index.xxxiv, 1134 pages.
The Meson Spectroscopy Program Using the Forward Tagger with CLAS12 at Jefferson Lab
No full textThe 12 GeV upgrade to the Continuous Electron Beam Accelerator Facility (CEBAF) will enable a new generation of experiments in hadronic nuclear physics at Jefferson Lab, seeking to address fundamental questions in QCD. For example, confirming the existence of exotic states, suggested by both quark models and lattice calculations, would allow gluonic degrees of freedom to be explored, and may help explain the role played by gluons in the QCD interaction.
In Experimental Hall B, meson spectroscopy (the MesonEx experiment) will be performed using low Q2 electron scattering to produce quasi-real photons. The scattered electron is detected at small angles by the Forward Tagger device, determining the properties of the photon on an event-by-event basis. This technique has notable advantages over real photon beams, and over hadronic beam experiments, where most experimental data exists.
This article will focus on the development of the Forward Tagger by the INFN Genova group, and the proposed MesonEx experiment
KSX Issue 1
No full textOne story, by Alexis Fegan Black, has been removed due to author opt-outThis publication may contain explicit sexual literary descriptions and/or artistic depictions
Permanence and transgression of the revenge tragedy motif in Stuart Neville’s The Twelve (2009)
No full textInternational audienceThe concept of "hauntology" - a word combining both haunting and ontology – was coined by Jacques Derrida to characterise a situation where an ideology that is no longer operative continues to haunt a place, informing its ongoing representations, its latent conflicts. The term refers to a temporal disjunction where the past persists in the present through the paradoxical observation that something has been lost but persists in the spirit of the place. Northern Ireland embodies this concept, as its history, geography and institutions are marked by a radical political schizophrenia stemming from a troubled past that even the peace process has not managed to erase. In The twelve (2009), Stuart Neville questions the feasibility and consequences of coming to terms with one’s past when confronted with this haunting. Gerry Fegan, an IRA hitman, drowned in alcohol and depression, is shown to be obsessed, haunted by the ghosts of his twelve victims. This article assesses the extent to which the book simultaneously renews the usual codes of thrillers and takes up the hackneyed classical tropes of the Elizabethan revenge tragedy, in a move that echoes the postmodern concept of differential repetition
Polarisation observables from strangeness photoproduction on a frozen spin target with CLAS at Jefferson Lab
Get PDFThis thesis presents the first, preliminary, measurements of the and G polarisation observables from strangeness photoproduction on a frozen spin polarised target, for the reactions and .
The data were collected at the Thomas Jefferson National Accelerator Facility using the CLAS detector in Experimental Hall B in conjunction with the FROST longitudinally polarised frozen spin target and a linearly polarised photon beam in the energy range W = 1.66 to 2.32 GeV.
The work forms part of a wider experimental program seeking to obtain experimental data on the excitation spectrum of the nucleon in order to better understand its structure via the measurement of polarisation observables, whose sensitivity to resonances makes them a desirable quantity to measure.
By studying strangeness reactions, it may be possible to find "missing" baryon resonances, predicted by symmetric quark models but not observed in previous experiments, whose results are consistent with the di-quark model.
It is thought these "missing" resonances remain undiscovered because they have different coupling strengths for different reaction channels, such as the strangeness reactions, whereas the current data is dominated by studies of reactions.
Measurements of the photon asymmetry, , have been made which agree with previous CLAS measurements, validating the use of the FROST polarised target for the measurement of other polarisation observables, such as the G beam-target double observable.
The G observable was measured on the FROST target via two techniques; from beam asymmetry measurements for the two available states of target polarisation, and a novel double asymmetry method intended to combine all the available polarised data.
Some inconsistencies between the G measurements for each state of target polarisation are observed, particularly at forward angles, and are much greater once dilution effects from the target material are accounted for.
As well as these dilution effects, the double asymmetry technique is also limited by insufficient constraint of the associated parameters from the limited data available on the reactions studied.
For , the results are compared to the Kaon-MAID isobaric model calculations, both with and without the inclusion of the missing resonance.
Both calculations are inconclusive when compared with the data, although at higher energies the calculation without the state better matches the trend of the results.
For , the model prediction, which does not include any missing states, shows agreement with the trend of the data for some of the energy bins.
In light of this new data, refitting of the models should be undertaken, as the next step in the theoretical interpretation of these results.
These measurements provide new information to the world dataset of polarisation observables, and with further analysis of the associated systematics of beam polarisation and dilution, the data will provide new insights into the process of strangeness photoproduction
FeTGAN: Federated Time-Series Generative Adversarial Network
No full textThe key to producing high-fidelity time-series data is to preserve temporal dynamics. This means that generated sequences respect the relationship between variables across time as in the original data. While new types of GANs have been used to generate time-series data, they, like previous GANimplementations, are time consuming to train. A novel federated framework is proposed, which generates realistic time-series data, by combining supervised and unsupervised training. The framework is based on the work in TimeGAN and Federated GAN (FeGAN). Using an embedded learning space, TimeGANencourages the network to mimic the structure of the training data. FeGAN allows the results of TimeGAN to be combined at a central server, which has benefits for both throughput, and potential to improve data privacy. This also introduces the possibility of using cross domain data. The challenge with creating applying federated learning to TimeGAN, and timeseries data in general is whether the learned temporal dynamics can be combined. This is accomplished by the combination of the weighting and sampling scheme used. This paper demonstrates, by qualitative and quantitative analysis, the ability novel framework proposed, to produce equivalent quality synthetic timeseries data compared to the original TimeGAN, without sharing local data between nodes in the network. This is based on the predictive and discriminative scores described, as well as PCA and t-SNE analysis. Additionally, there is an approximate eleven percent increase in Floating Point Operations per second when using one machine, and up to a thirty percent increase when using multiple.CSE3000 Research ProjectComputer Science and Engineerin
University of Queensland St John's College Football Team, John Denis Fryer seated extreme right and St John’s Warden, Rev Stevenson seated third from left, Brisbane, c1920
No full textJohn Denis (Jack) Fryer was born in 1895 at Springsure, Queensland, son of Charles George Fryer and his wife Rosina, née Richards. Charles and Rosina had seven children: Elizabeth Stuart (later Gilmour), William Thomas, Charles George, Henry Hardy, John Denis, Richard Alexander James and Walter Ponsonby. Jack won a scholarship to the University of Queensland and commenced study in 1915. By the end of first term, Jack decided to volunteer for military service in the first Australian Imperial Force. He was commissioned in 1916 and went to France where he was gassed in early 1917. After hospitalisation in England, Jack returned to France for the final push to Amiens, in August 1918. There he was again wounded, by a stick bomb. After the war he re-enrolled at the University of Queensland for the first term of 1920 to complete his English honours examinations. His health failed in 1922 and he died in February 1923. In 1926, as a memorial to their former member and vice-president, members of the University Dramatic Society donated £10 to establish a collection of works in Australian literature. The Fryer collection was maintained in the English Department until the 1950s when it became part of the University of Queensland Library
La mode à l’étrangeté: « The Ghosts of Belfast » de Stuart Neville
Get PDFDer Artikel enthält Zusammenfassungen nur in Englisch.In The Ghosts of Belfast (2009), spectres of the conflict’s victims haunt Gerry Fegan, a former “soldier” and assassin. Picking up the metaphorical cue from the epigraph to Neville’s novel – “the place that lacks its ghosts is a barren place” – the article addresses the thriller’s supernatural content. The meaning and role of the titular ghosts have been in part determined by Neville’s debt to the Western traditions of making sense of the supernatural. However, they assume new roles within the narrative and possibly also in the author’s vision of the peace process: i.e. in keeping Northern Ireland “fertile”.L'article contient uniquement les résumés en anglais
Hydrophilic and organophilic properties of zeolites and silica molecular sieves
Get PDFThe research work described in this thesis encompasses a number
of different aspects of zeolite science. Involvement with the
aqueous solution chemistry of zeolitic materials is prevalent throughout
and the greater proportion of the work relates to the silica molecular
sieve silicalite-1. The ability of this material to adsorb organic
molecules from aqueous solution is described and adsorption isotherms
for the uptake of a, w-alkanediols are presented.
Whilst the aforementioned sorption studies were in progress it
became apparent that these microporous silica sieves were far more
complex solids than originally thought. In particular, the mode of
synthesis was found to have a critical bearing on the resultant chemical
compositions of the crystals. More specifically, alkali metal ions
from reaction mixtures become incorporated in products even though
crystals are virtually aluminium free. "..T q learn more about this
phenomenon and, more generally, to aquire a greater understanding of
these solids detailed synthesis studies were undertaken. Crystallisation
in the Na20-TPABr-SiO2-H20 and in the Amine-TPABr-SiO2-H2O systems
has been investigated. The experimental work is complemented by a
theoretical analysis of silica . molecular sieve crystallisation.
A collection of the physicochemical properties of silicalite
are discussed and these are-compared and contrasted to properties
typical of aluminous zeolitic materials.
The latter part of this thesis discusses the subject of salt
imbibition by zeolites, the uptake of salts from aqueous solution into
the intracrystalline channels and cavities. In general, aluminous
zeolites were found to favour adsorption of inorganic salts, the more
silicious materials preferring salts with organic character. The postsynthesis
sorption of salts is correlated to the incorporation of guest
species in zeolitic materials during synthesis.
The aforementioned salt imbibition studies were carried out using
a new experimental procedure based on isopiestic vapour pressure
measurements. The results presented show the powerful nature of this
technique and demonstrate some of its many applications
Polarisation observables for strangeness photoproduction on a frozen spin target with CLAS at Jefferson Lab
No full text- …
