1,002 research outputs found
Optimising neutron production from compact low energy accelerators
No full textThere is currently much development in accelerator
based methods to provide flexible and reliable neutron generators,
in response to a decline in the availability of nuclear
reactors. In this paper the focus is on neutron production
via a low energy DC proton accelerator (1-10 MeV)
and light target system. GEANT4 simulations are being
used to study various aspects of target design, beginning
with studies into light targets, such as lithium and beryllium,
which are already in use. Initially the aim is to replicate
these designs and benchmark these simulations with
other models and experimental results before investigating
how modifications can improve neutron production and tailor
experimental geometries to specific applications such as
neutron capture therapy and medical isotope production
If you don’t know, you can’t help: A practical guide for alcohol and other drug screening in psychological services
No full textAlcohol is implicated in over 60 diseases and injuries and accounted for 6.2 per cent of all male deaths globally in 2004 (WHO, 2011). Alcohol and other drug (AOD) abuse causes significant individual, family and social harms at all age levels and across all socioeconomic groups. These may result from intoxication (e.g., overdose, vulnerability to physical injury/trauma or death, consequences of impulsive behaviour, aggression and driving under the influence) and longer-term consequences (e.g., alcohol or drug-related brain injury, cardiovascular and liver diseases, blood borne viruses e.g., Chikritzhs et al., 2003, Roxburgh et al., 2013). Mental health problems may be triggered or exacerbated, and family breakdown, poor self-esteem, legal issues and lack of community engagement may also be evident. Despite the prevalence of substance use disorders and evident consequences for the individual, family and wider community, it would seem that health professionals, including psychologists, are reluctant to ask about substance use
Impact on calorimeters design, due to ILC staging at 250 GeV centre of mass
No full textInternational audienceThe staging of the ILC accelerator project to run at 250 GeV centre-of-mass energy, impacts directly the calorimeters design. The paper describes some of the consequences and draws the overall picture of the design in view of this impact
Performance considerations for Philippe Gaubert's “Madrigal”
No full textThe purpose of this document is to analyze stylistic interpretations of Philippe Gaubert's Madrigal using performances by the composer himself and nine other flutists. These artists include Robert Aitken, James Galway, Susan Milan, Marcel Moyse, Gary Schocker, Fenwick Smith, Mark Sparks, Kathryn Thomas, and Laurel Zucker. Philippe Gaubert's musical background, compositions, as well as his personal performances of the Madrigal will be the foundation for comparison. Discussion of the other artists' performances will include influences on individual expression, cultural context, and personal musicality. The author will also discuss elements implemented into her own performance of the work
Measurements of mean lifetime and branching fractions of b hadrons decaying to J / psi
No full textFrom a data sample of 450 000 hadronic events recorded with the ALEPH detector at LEP, 92±10 events are observed containing a J/ψ meson decaying to μ+μ− or e+e−. From these data the measured inclusive branching fraction for a b flavoured hadron to decay to a J/ψ is BR(b→ J/ψX) = (1.21±0.13 (stat.)±0.08 (syst.))%, and the average b hadron lifetime in the events tagged with a J/ψ is τb = 1.35+0.19−0.17±0.05 ps. Five events are observed consistent with the exclusive decay B± → J/ψK± and from these events the exclusive branching fraction is measured to be BR(B± → J/ψK±) = (0.22±0.10±0.02)%. Upper limits for other exclusive branching ratios are given
Tau Polarization in Z Decays Measurement of the Z to e's and Tau's Vector to Axial Coupling Ratios
No full textPotential of a compact low energy proton accelertor for medical applications
No full textThis thesis explores the potential of a compact low energy (<10MeV) proton accelerator for medical applications such as the production of neutrons for cancer neutron therapy and the production of SPECT (Single Photon Emission Computed Tomography) and PET (Positron Emission Tomography) radioisotopes.
During the course of this study the simulation code GEANT4 was used to study yields of these neutrons and isotopes from the typically low threshold high cross-‐section (p,n) reactions. Due to the limits of the
current models within GEANT4 some development of a new data-‐driven model for low energy proton interactions was undertaken and has been tested here. This model was found to be suitably reliable for continued study into the low energy production of positron emitting, PET, isotopes of copper and gallium as replacements for the main SPECT isotope technetium-‐99m. While 99mTc is currently the most popular radioisotope being used in over 90% of the worlds nuclear medicine diagnostic procedures supply is under threat by the impending shut down of the current reactor based sources.
Simulations of both thin and thick targets were carried out to study the potential of low energy production of these isotopes. The final activity of the radioisotopes after irradiation of these targets produced by the simulations has been shown here to be sufficient for multiple doses. The useable activity is dependent on the efficiency of the extraction process and the time between irradiation and administration
A figure of chinese French-speaking world : f. Cheng "pilgrim between the Orient and the Occident"
No full textNotre recherche a voulu cerner l'acte d'écriture de F. Cheng tant au niveau de sa réalisation que de sa visée. Nous nous sommes interrogés sur les particularités des textes, leur complexité dans leur élaboration et leur compréhension. En évoquant son parcours de vie nous avons tenté de mettre en relief quels liens effectifs reliaient la Chine et la France dans cet imaginaire asiatique exprimé en langue française. Si l'analyse de l'oeuvre montre comment l'auteur a diversifié ses choix scripturaux, elle évoque aussi le problème de l'achèvement ou de l'inachèvement face à la récurrence d'écrits. Notre étude a voulu aborder l'évolution de sa création littéraire à travers "l'objet-livre", mais aussi avec un regard diachronique permettant de mieux appréhender son rapport au temps. L'analyse de la "poétique" scripturale de F. Cheng, fondée sur l'interculturalité et l'intertextualité, a voulu comprendre l'objectif littéraire de celui qui désire être "passeur" entre l'Orient et l'OccidentOur wish is this research is to define the act of writing of F. Cheng both at the level of his realization and at his design. We wondered about the features of texts, their complexity in their elaboration and their comprehension. By recalling his course of life we tried to put into relief the real links which linked up China to France in this Asiatic imagination expressed in French language. If the analysis of the works shows how the author diversified his writing choices, it also recalls the problem of achievement or incompleteness faced to the recurrence of writings. Our study has approached the evolution of its literary creation across "the object-book" as well as an allowing diachronic look to which enables a better being within time. The analysis of writing "poetics" of F. Cheng, based on the interculturality and the intertextuality, wanted to understand the literary objective of those who wish to be "conductor" between, the Orient and the Occiden
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