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Search Results: 1 - 10 of 449517 matches for " J. C. Bewick "
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Internal Nasal Valve Incompetence Is Effectively Treated Using Batten Graft Functional Rhinoplasty
J. C. Bewick,M. A. Buchanan,A. C. Frosh
International Journal of Otolaryngology , 2013, DOI: 10.1155/2013/734795
Internal Nasal Valve Incompetence Is Effectively Treated Using Batten Graft Functional Rhinoplasty
J. C. Bewick,M. A. Buchanan,A. C. Frosh
International Journal of Otolaryngology , 2013, DOI: 10.1155/2013/734795
Abstract: Introduction. Internal nasal valve incompetence (INVI) has been treated with various surgical methods. Large, single surgeon case series are lacking, meaning that the evidence supporting a particular technique has been deficient. We present a case series using alar batten grafts to reconstruct the internal nasal valve, all performed by the senior author. Methods. Over a 7-year period, 107 patients with nasal obstruction caused by INVI underwent alar batten grafting. Preoperative assessment included the use of nasal strips to evaluate symptom improvement. Visual analogue scale (VAS) assessment of nasal blockage (NB) and quality of life (QOL) both pre- and postoperatively were performed and analysed with the Wilcoxon signed rank test. Results. Sixty-seven patients responded to both pre- and postoperative questionnaires. Ninety-one percent reported an improvement in NB and 88% an improvement in QOL. The greatest improvement was seen at 6 months (median VAS 15?mm and 88?mm resp., with a P value of <0.05 for both). Nasal strips were used preoperatively and are a useful tool in predicting patient operative success in both NB and QOL (odds ratio 2.15 and 2.58, resp.). Conclusions. Alar batten graft insertion as a single technique is a valid technique in treating INVI and produces good outcomes. 1. Introduction Internal nasal valve incompetence (INVI) is an often overlooked cause of nasal obstruction which in turn can mistakenly be attributed to other anatomical variations such as septal deviation and turbinate hypertrophy. It is characterised by the collapse during inspiration of the upper lateral cartilages; a narrowing of the angle between the dorsal septum and upper laterals can also contribute but to a lesser extent. Functional rhinoplasty procedures for INVI have evolved over the past decade. A wide range of techniques exists in which surgeons use alar batten and/or spreader grafts, butterfly grafts, lateral crural strut grafts, alar rim grafts [1], and lateral suspension sutures. Alar batten grafts were first shown by Toriumi et al. [2] as an effective technique for correction of internal nasal valve collapse. Since then they have been widely used, but a reliable case series has yet to be published. Case-based series assessing specific techniques are not widely available. When single-technique series are published, they often concentrate on the cosmetic outcomes. Series are usually small [3] and involve several operating surgeons [4] without specific outcomes. Recent papers have called for a single technique by a single operating surgeon to be assessed
A Study of the Scintillation Induced by Alpha Particles and Gamma Rays in Liquid Xenon in an Electric Field
J. V. Dawson,A. S. Howard,D. Akimov,H. Araujo,A. Bewick,D. C. R. Davidge,W. G. Jones,M. Joshi,V. N. Lebedenko,I. Liubarsky,J. J. Quenby,G. Rochester,D. Shaul,T. J. Sumner,R. J. Walker
Physics , 2005, DOI: 10.1016/j.nima.2005.01.343
Abstract: Scintillation produced in liquid xenon by alpha particles and gamma rays has been studied as a function of applied electric field. For back scattered gamma rays with energy of about 200 keV, the number of scintillation photons was found to decrease by 64+/-2% with increasing field strength. Consequently, the pulse shape discrimination power between alpha particles and gamma rays is found to reduce with increasing field, but remaining non-zero at higher fields.
Measurements of Scintillation Efficiency and Pulse-Shape for Low Energy Recoils in Liquid Xenon
D. Akimov,A. Bewick,D. Davidge,J. Dawson,A. S. Howard,I. Ivaniouchenkov,W. G. Jones,M. Joshi,V. A. Kudryavtsev,T. B. Lawson,V. Lebedenko,M. J. Lehner,P. K. Lightfoot,I. Liubarsky,R. Luscher,J. E. McMillan,C. D. Peak,J. J. Quenby,N. J. C. Spooner,T. J. Sumner,D. R. Tovey,C. K. Ward
Physics , 2001, DOI: 10.1016/S0370-2693(01)01411-3
Abstract: Results of observations of low energy nuclear and electron recoil events in liquid xenon scintillator detectors are given. The relative scintillation efficiency for nuclear recoils is 0.22 +/- 0.01 in the recoil energy range 40 keV - 70 keV. Under the assumption of a single dominant decay component to the scintillation pulse-shape the log-normal mean parameter T0 of the maximum likelihood estimator of the decay time constant for 6 keV < Eee < 30 keV nuclear recoil events is equal to 21.0 ns +/- 0.5 ns. It is observed that for electron recoils T0 rises slowly with energy, having a value ~ 30 ns at Eee ~ 15 keV. Electron and nuclear recoil pulse-shapes are found to be well fitted by single exponential functions although some evidence is found for a double exponential form for the nuclear recoil pulse-shape.
Study and suppression of anomalous fast events in inorganic scintillators for dark matter searches
V. A. Kudryavtsev,N. J. C. Spooner,P. K. Lightfoot,J. W. Roberts,M. J. Lehner,T. Gamble,M. J. Carson,T. B. Lawson,R. Luscher,J. E. McMillan,B. Morgan,S. M. Paling,M. Robinson,D. R. Tovey,N. J. T. Smith,P. F. Smith,G. J. Alner,S. P. Hart,J. D. Lewin,R. M. Preece,T. J. Sumner,W. G. Jones,J. J. Quenby,B. Ahmed,A. Bewick,D. Davidge,J. V. Dawson,A. S. Howard,I. Ivaniouchenkov,M. K. Joshi,V. Lebedenko,I. Liubarsky,J. C. Barton,G. Gerbier,J. Mallet,L. Mosca,C. Tao
Physics , 2001, DOI: 10.1016/S0927-6505(01)00167-0
Abstract: The status of dark matter searches with inorganic scintillator detectors at Boulby mine is reviewed and the results of tests with a CsI(Tl) crystal are presented. The objectives of the latter experiment were to study anomalous fast events previously observed and to identify ways to remove this background. Clear indications were found that these events were due to surface contamination of crystals by alphas, probably from radon decay. A new array of unencapsulated NaI(Tl) crystals immersed either in liquid paraffin or pure nitrogen atmosphere is under construction at Boulby. Such an approach allows complete control of the surface of the crystals and the ability to remove any surface contamination. First data from the unencapsulated NaI(Tl) do not show the presence of anomalous fast events.
Changes in undergraduate student alcohol consumption as they progress through university
Bridgette M Bewick, Brendan Mulhern, Michael Barkham, Karen Trusler, Andrew J Hill, William B Stiles
BMC Public Health , 2008, DOI: 10.1186/1471-2458-8-163
Abstract: Data were collected over three years from 5895 undergraduate students who began their studies in either 2000 or 2001. Longitudinal data (i.e. Years 1–3) were available from 225 students. The remaining 5670 students all responded to at least one of the three surveys (Year 1 n = 2843; Year 2 n = 2219; Year 3 n = 1805).Students reported consuming significantly more units of alcohol per week at Year 1 than at Years 2 or 3 of their degree. Male students reported a higher consumption of units of alcohol than their female peers. When alcohol intake was classified using the Royal College of Physicians guidelines [1] there was no difference between male and females students in terms of the percentage exceeding recommended limits. Compared to those who were low level consumers students who reported drinking above low levels at Year 1 had at least 10 times the odds of continuing to consume above low levels at year 3. Students who reported higher levels of drinking were more likely to report that alcohol had a negative impact on their studies, finances and physical health. Consistent with the reduction in units over time students reported lower levels of negative impact during Year 3 when compared to Year 1.The current findings suggest that student alcohol consumption declines over their undergraduate studies; however weekly levels of consumption at Year 3 remain high for a substantial number of students. The persistence of high levels of consumption in a large population of students suggests the need for effective preventative and treatment interventions for all year groups.Heavy alcohol intake amongst the student population has implications for the individual, educational institutions, and wider society [2-4]. Students have been reported to drink at higher levels than non-student peers [5-9], making this an issue of public health concern given the negative social and health consequences of heavy intake [10] and the link with other unhealthy behaviours (e.g. cigarette smoking
The NAIAD experiment for WIMP searches at Boulby mine and recent results
B. Ahmed,G. J. Alner,H. Araujo,J. C. Barton,A. Bewick,M. J. Carson,D. Davidge,J. V. Dawson,T. Gamble,S. P. Hart,R. Hollingworth,A. S. Howard,W. G. Jones,M. K. Joshi,V. A. Kudryavtsev,T. B. Lawson,V. Lebedenko,M. J. Lehner,J. D. Lewin,P. K. Lightfoot,I. Liubarsky,R. Luscher,J. E. McMillan,B. Morgan,G. Nicklin,S. M. Paling,R. M. Preece,J. J. Quenby,J. W. Roberts,M. Robinson,N. J. T. Smith,P. F. Smith,N. J. C. Spooner,T. J. Sumner,D. R. Tovey
Physics , 2003, DOI: 10.1016/S0927-6505(03)00115-4
Abstract: The NAIAD experiment (NaI Advanced Detector) for WIMP dark matter searches at Boulby mine (UK) is described. The detector consists of an array of encapsulated and unencapsulated NaI(Tl) crystals with high light yield. Six crystals are collecting data at present. Data accumulated by four of them (10.6 kg x year exposure) have been used to set upper limits on the WIMP-nucleon spin-independent and WIMP-proton spin-dependent cross-sections. Pulse shape analysis has been applied to discriminate between nuclear recoils, as may be caused by WIMP interactions, and electron recoils due to gamma background. Various calibrations of crystals are presented.
Limits on the spin-dependent WIMP-nucleon cross-sections from the first science run of the ZEPLIN-III experiment
V. N. Lebedenko,H. M. Araujo,E. J. Barnes,A. Bewick,R. Cashmore,V. Chepel,D. Davidge,J. Dawson,T. Durkin,B. Edwards,C. Ghag,V. Graffagnino,M. Horn,A. S. Howard,A. J. Hughes,W. G. Jones,M. Joshi,G. E. Kalmus,A. G. Kovalenko,A. Lindote,I. Liubarsky,M. I. Lopes,R. Luscher,K. Lyons,P. Majewski,A. StJ. Murphy,F. Neves,J. Pinto da Cunha,R. Preece,J. J. Quenby,P. R. Scovell,C. Silva,V. N. Solovov,N. J. T. Smith,P. F. Smith,V. N. Stekhanov,T. J. Sumner,C. Thorne,R. J. Walker
Physics , 2009, DOI: 10.1103/PhysRevLett.103.151302
Abstract: We present new experimental constraints on the WIMP-nucleon spin-dependent elastic cross-sections using data from the first science run of ZEPLIN-III, a two-phase xenon experiment searching for galactic dark matter WIMPs based at the Boulby mine. Analysis of $\sim$450 kg$\cdot$days fiducial exposure revealed a most likely signal of zero events, leading to a 90%-confidence upper limit on the pure WIMP-neutron cross-section of $\sigma_n=1.8\times 10^{-2}$ pb at 55 GeV/$c^2$ WIMP mass. Recent calculations of the nuclear spin structure based on the Bonn CD nucleon-nucleon potential were used for the odd-neutron isotopes $^{129}$Xe and $^{131}$Xe. These indicate that the sensitivity of xenon targets to the spin-dependent WIMP-proton interaction is much lower than implied by previous calculations, whereas the WIMP-neutron sensitivity is impaired only by a factor of $\sim$2.
Measurement and simulation of the muon-induced neutron yield in lead
L. Reichhart,A. Lindote,D. Yu. Akimov,H. M. Araujo,E. J. Barnes,V. A. Belov,A. Bewick,A. A. Burenkov,V. Chepel,A. Currie,L. DeViveiros,B. Edwards,V. Francis,C. Ghag,A. Hollingsworth,M. Horn,G. E. Kalmus,A. S. Kobyakin,A. G. Kovalenko,V. A. Kudryavtsev,V. N. Lebedenko,M. I. Lopes,R. Luscher,P. Majewski,A. St J. Murphy,F. Neves,S. M. Paling,J. Pinto da Cunha,R. Preece,J. J. Quenby,P. R. Scovell,C. Silva,V. N. Solovov,N. J. T. Smith,P. F. Smith,V. N. Stekhanov,T. J. Sumner,C. Thorne,R. J. Walker
Physics , 2013, DOI: 10.1016/j.astropartphys.2013.06.002
Abstract: A measurement is presented of the neutron production rate in lead by high energy cosmic-ray muons at a depth of 2850 m water equivalent (w.e.) and a mean muon energy of 260 GeV. The measurement exploits the delayed coincidences between muons and the radiative capture of induced neutrons in a highly segmented tonne scale plastic scintillator detector. Detailed Monte Carlo simulations reproduce well the measured capture times and multiplicities and, within the dynamic range of the instrumentation, the spectrum of energy deposits. By comparing measurements with simulations of neutron capture rates a neutron yield in lead of (5.78^{+0.21}_{-0.28}) x 10^{-3} neutrons/muon/(g/cm^{2}) has been obtained. Absolute agreement between simulation and data is of order 25%. Consequences for deep underground rare event searches are discussed.
WIMP-nucleon cross-section results from the second science run of ZEPLIN-III
D. Yu. Akimov,H. M. Araujo,E. J. Barnes,V. A. Belov,A. Bewick,A. A. Burenkov,V. Chepel,A. Currie,L. DeViveiros,B. Edwards,C. Ghag,A. Hollingsworth,M. Horn,W. G. Jones,G. E. Kalmus,A. S. Kobyakin,A. G. Kovalenko,V. N. Lebedenko,A. Lindote,M. I. Lopes,R. Luscher,P. Majewski,A. StJ. Murphy,F. Neves,S. M. Paling,J. Pinto da Cunha,R. Preece,J. J. Quenby,L. Reichhart,P. R. Scovell,C. Silva,V. N. Solovov,N. J. T. Smith,V. N. Stekhanov,T. J. Sumner,C. Thorne,R. J. Walker
Physics , 2011, DOI: 10.1016/j.physletb.2012.01.064
Abstract: We report experimental upper limits on WIMP-nucleon elastic scattering cross sections from the second science run of ZEPLIN-III at the Boulby Underground Laboratory. A raw fiducial exposure of 1,344 kg.days was accrued over 319 days of continuous operation between June 2010 and May 2011. A total of eight events was observed in the signal acceptance region in the nuclear recoil energy range 7-29 keV, which is compatible with background expectations. This allows the exclusion of the scalar cross-section above 4.8E-8 pb near 50 GeV/c^2 WIMP mass with 90% confidence. Combined with data from the first run, this result improves to 3.9E-8 pb. The corresponding WIMP-neutron spin-dependent cross-section limit is 8.0E-3 pb. The ZEPLIN programme reaches thus its conclusion at Boulby, having deployed and exploited successfully three liquid xenon experiments of increasing reach.
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