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Search Results: 1 - 10 of 297731 matches for " J McDermott "
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Detecting Disordered Eating among Recreational Exercisers; Exploring the Role of Personal Trainers  [PDF]
Hilary J. McDermott, Carolyn Plateau, Leigh Martin
Psychology (PSYCH) , 2018, DOI: 10.4236/psych.2018.914162
Abstract: This study aimed to understand how personal trainers identify and manage disordered eating among their clients. Semi-structured interviews were undertaken with eleven UK based personal trainers to document their experiences of working with clients exhibiting symptoms of disordered eating. The interviews were recorded, fully transcribed and subjected to a thematic analysis. The findings suggest that personal trainers rely on external cues to identify disordered eating among clients such as changes to physical appearance, exercise behaviours and performance. The findings also revealed that personal trainers lack knowledge and hold misconceptions about disordered eating. Such misconceptions influenced their ability to identify and manage potential problems among their clients. Participants described the need for further education and guidelines to increase their knowledge and confidence in identifying and managing disordered eating among their clients. The findings from this study will be useful for professional bodies and practitioners in the development of guidelines and educational material for personal trainers.
A Technical Comparison of Digital Frequency-Lowering Algorithms Available in Two Current Hearing Aids
Hugh J. McDermott
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0022358
Abstract: Background Recently two major manufacturers of hearing aids introduced two distinct frequency-lowering techniques that were designed to compensate in part for the perceptual effects of high-frequency hearing impairments. The Widex “Audibility Extender” is a linear frequency transposition scheme, whereas the Phonak “SoundRecover” scheme employs nonlinear frequency compression. Although these schemes process sound signals in very different ways, studies investigating their use by both adults and children with hearing impairment have reported significant perceptual benefits. However, the modifications that these innovative schemes apply to sound signals have not previously been described or compared in detail. Methods The main aim of the present study was to analyze these schemes'technical performance by measuring outputs from each type of hearing aid with the frequency-lowering functions enabled and disabled. The input signals included sinusoids, flute sounds, and speech material. Spectral analyses were carried out on the output signals produced by the hearing aids in each condition. Conclusions The results of the analyses confirmed that each scheme was effective at lowering certain high-frequency acoustic signals, although both techniques also distorted some signals. Most importantly, the application of either frequency-lowering scheme would be expected to improve the audibility of many sounds having salient high-frequency components. Nevertheless, considerably different perceptual effects would be expected from these schemes, even when each hearing aid is fitted in accordance with the same audiometric configuration of hearing impairment. In general, these findings reinforce the need for appropriate selection and fitting of sound-processing schemes in modern hearing aids to suit the characteristics and preferences of individual listeners.
Realisations of Quantum GL_p,q(2) and Jordanian GL_h,h'(2)
Deepak Parashar,Roger J. McDermott
Physics , 1999, DOI: 10.1023/A:1022849704316
Abstract: The quantum group GL_p,q(2) is known to be related to the Jordanian GL_h,h'(2) via a contraction procedure. It can also be realised using the generators of the Hopf algebra G_r,s. We contract the G_r,s quantum group to obtain its Jordanian analogue G_m,k, which provides a realisation of GL_h,h'(2) in a manner similar to the q-deformed case.
Inhomogeneous Multiparameter Jordanian Quantum Groups by Contraction
Roger J. McDermott,Deepak Parashar
Physics , 1999, DOI: 10.1023/A:1022845603408
Abstract: It is known that the inhomogeneous quantum group IGL_{q,r}(2) can be constructed as a quotient of the multiparameter q-deformation of GL(3). We show that a similar result holds for the inhomogeneous Jordanian deformation and exhibit its Hopf structure.
On some two parameter Quantum and Jordanian deformations, and their Coloured extensions
Deepak Parashar,Roger J. McDermott
Physics , 1999,
Abstract: This paper suveys some recent algebraic developments in two parameter Quantum deformations and their Nonstandard (or Jordanian) counterparts. In particular, we discuss the contraction procedure and the quantum group homomorphisms associated to these deformations. The scheme is then set in the wider context of the coloured extensions of these deformations, namely, the so-called Coloured Quantum Groups.
Contraction of the G_r,s Quantum Group to its Nonstandard analogue and corresponding Coloured Quantum Groups
Deepak Parashar,Roger J. McDermott
Physics , 1999, DOI: 10.1063/1.533248
Abstract: The quantum group G_r,s provides a realisation of the two parameter quantum GL_p,q(2) which is known to be related to the two parameter nonstandard GL_hh'(2) group via a contraction method. We apply the contraction procedure to G_r,s and obtain a new Jordanian quantum group G_m,k. Furthermore, we provide a realisation of GL_h,h'(2) in terms of G_m,k. The contraction procedure is then extended to the coloured quantum group GL_r{\lambda,\mu}(2) to yield a new Jordanian quantum group GL_m{\lambda,\mu}(2). Both G_r,s and G_m,k are then generalised to their coloured versions which inturn provide similar realisations of GL_r{\lambda,\mu}(2) and GL_m{\lambda,\mu}(2).
Duality for the G_r,s Quantum Group
Deepak Parashar,Roger J. McDermott
Mathematics , 1999,
Abstract: The two parameter quantum group G_r,s is generated by five elements, four of which form a Hopf subalgebra isomorphic to GL_q(2), while the fifth generator relates G_r,s to GL_p,q(2). We construct explicitly the dual algebra of G_r,s and show that it is isomorphic to the single parameter deformation of gl(2) + gl(1), with the second parameter appearing in the costructure. We also formulate a differential calculus on G_r,s which provides a realisation of the calculus on GL_p,q(2).
A Combined Probabilistic and Optimization Approach for Improved Chemical Mixing Systems Design  [PDF]
Matthew J. Opgenorth, William E. McDermott, Peter Laz, Corinne S. Lengsfeld
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.36077
Abstract: A design analysis of a mixing nozzle was performed using a combination of probabilistic and optimization techniques. A novel approach was utilized where probabilistic analysis was used to reduce the number of geometric constraints based on sensitivity factors. An optimization algorithm used only the most significant parameters to maximize mixing. A second probabilistic analysis was performed after optimization was com-plete in order to quantitatively predict the effects of manufacturing tolerances on mixing performance. This process for automated design is attractive over full parameter optimization techniques due to the computa-tional efficiency resulting from an intelligent reduction in evaluated variables.
Further analysis of the BFKL equation with momentum cutoffs
M. F. McDermott,J. R. Forshaw
Physics , 1996, DOI: 10.1016/S0550-3213(96)00600-1
Abstract: In this paper we investigate the effect of introducing transverse momentum cutoffs on the BFKL equation. We present solutions in moment space for various models of the BFKL kernel for different combinations of these cutoffs. We improve on previous calculations by using the full BFKL kernel (rather than simplified analytic approximations). The significance of the next-to-leading or ``higher twist'' terms in the kernel are assessed. We find that, while these terms are negligible in the absence of cutoffs, introducing an infra-red cutoff markedly enhances their significance.
Dynamic Regimes for Driven Colloidal Particles on a Periodic Substrate at Commensurate and Incommensurate Fillings
D. McDermott,J. Amelang,C. J. Olson Reichhardt,C. Reichhardt
Physics , 2013, DOI: 10.1103/PhysRevE.88.062301
Abstract: We examine colloidal particles driven over a periodic muffin tin substrate using numerical simulations. In the absence of a driving force this system exhibits a rich variety of commensurate and incommensurate static phases in which topological defects can form domain walls, ordered stripes, superlattices, and disordered patchy regimes as a function of the filling fraction. When an external drive is applied, these different static phases generate distinct dynamical responses. At incommensurate fillings the flow generally occurs in the form of localized pulses or solitons correlated with the motion of the topological defect structures. We also find dynamic transitions between different types of moving states that are associated with changes in the velocity force curves, structural transitions in the topological defect arrangements, and modifications of the velocity distributions and particle trajectories. We find that the dynamic transitions between ordered and disordered flows exhibit hysteresis, while in strongly disordered regimes there is no hysteresis and the velocity force curves are smooth. When stripe patterns are present, transport can occur along the stripe direction rather than along the driving direction. Structural dynamic transitions can also occur within the pinned regimes when the applied drive causes distortions of the interstitially pinned particles while the particles trapped at pinning sites remain immobile.
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