4,332 research outputs found
Liver injury in isolated perfused rat liver preparation exposed to chloroform
No full text Page 548: R. W. Brauer, G. F. Leong and R. J. Holloway, "Liver injury in isolated perfused rat liver preparation exposed to chloroform." Through an unfortunate oversight, throughout the text and figures, chloroform concentrations are referred to in terms of milligrams per liter instead of the correct unit of grams per liter. Thus, the chloroform levels employed and illustrated, for instance, in figure 2 should read 0.016 g/liter, etc. </jats:p
The effect of surface treatments on the mechanical properties of basalt reinforced epoxy composites
No full textBasalt fiber is an emerging alternative reinforcement to glass or carbon depending upon the application. An important contributing parameter to ultimate performance of any composite is the fiber–-matrix interface, to which toughness and compressive strength are intimately related. To better understand this matrix fiber interaction in controlling properties, we compared different modification strategies and the impact upon the properties of composites. Strategies focussing upon mechanical interlocking through increased surface roughness and covalent chemical bonding using sol/get methods were explored. Combined methods were also used to explore synergistic behavior as well as the use of aliphatic triethylenetetramine (TETA) to react with any covalently attached epoxy groups. Results from single ply composites showed that when the properties were fiber or fiber/matrix dominated, the sol/gel or epoxy silane method gave the largest improvement in ultimate tensile strength increasing 66% and 27% for uni-weave 0° and 45° laminas. The combined surface modification methods exhibited increases of 45% and 13% for the same laminas. When properties were matrix dominated, the combined strategies produced the highest improvements in ultimate tensile strength of about 55% compared with 37% for sol/gel modification. For 16-ply plain weave laminates, epoxy silane surface treatments produced the greatest improvements in compressive and interlaminar shear strengths, increasing 52% and 21%, respectively. This correlated with fiber- and fiber/matrix-dominated results from single ply laminas. The combined treatment using TETA however decreased shear and compressive strength by about 20%, while scanning electron microscopy (SEM) evaluation and dynamic mechanical thermal analysis (DMTA) attributed this to increased resin ductility and plasticization
High-nonlinearity dispersion-shifted lead-silicate holey fibers for efficient 1-µm pumped supercontinuum generation
No full textThis paper reports on the recent progress in the design and fabrication of high-nonlinearity lead-silicate holey fibers (HFs). First, the fabrication of a fiber designed to offer close to the maximum possible nonlinearity per unit length in this glass type is described. A value of gamma = 1860 W-1 · km-1 at a wavelength of 1.55 µm is achieved, which is believed to be a record for any fiber at this wavelength. Second, the design and fabrication of a fiber with a slightly reduced nonlinearity but with dispersion-shifted characteristics tailored to enhance broadband supercontinuum (SC) generation when pumped at a wavelength of 1.06 µm - a wavelength readily generated using Yb-doped fiber lasers - are described. SC generation spanning more than 1000 nm is observed for modest pulse energies of ~ 100 pJ using a short length of this fiber. Finally, the results of numerical simulations of the SC process in the proposed fibers are presented, which are in good agreement with the experimental observations and highlight the importance of accurate control of the zero-dispersion wavelength (ZDW) when optimizing such fibers for SC performance
Relationship between disease severity and quality of life and assessment of health care utilization and cost for ulcerative colitis in Australia: a cross-sectional, observational study
No full textAbstract not availablePeter R. Gibson, Carolynne Vaizey, Christopher M. Black, Rebecca Nicholls, Adèle R. Weston, Peter Bampton, Miles Sparrow, Ian C. Lawrance, Warwick S. Selby, Jane M. Andrews, Alissa J. Walshm, David J. Hetzel, Finlay A. Macrae, Gregory T. Moore, Martin D. Weltman, Rupert W. Leong, Tao Fa
A phase 2 study of allogeneic mesenchymal stromal cells for luminal crohn's disease refractory to biologic therapy
No full textAbstract not availableGeoffrey M. Forbes, Marian J. Sturm, Rupert W. Leong, Miles P. Sparrow, Dev Segarajasingam, Adrian G. Cummins, Michael Phillips, and Richard P. Herrman
Utilizing SELinux to Mandate Ultra-secure Access Control of Medical Records
No full textOngoing concerns have been raised over the effectiveness of information technology products and systems in maintaining privacy protection for sensitive data. The aim is to ensure that sensitive health information can be adequately protected yet still be accessible only to those that "need-to-know". To achieve this and ensure sustainability over the longer term, it is advocated that an alternative, stable and secure system architecture is required. This paper considers the adoption of a model targeted at health information that provides much higher degrees of protection. A purpose built demonstrator that was developed based on enterprise-level systems software products is detailed. The long term aim is to provide a viable solution by utilizing contemporary, commercially supported operating system and allied software. The advantages and limitations in its application with a medical database are discussed. The future needs in terms of research, software development and changes in organizational policy for healthcare providers, are outlined
Variations in coronary lumen dimensions measured In vivo
No full textLetter to the EditorRishi Puri, Adam J. Nelson, Gary Y. H. Liew, Stephen J. Nicholls, Angelo Carbone, Dennis T. L. Wong, James E. Harvey, Kiyoko Uno, Barbara Copus, Darryl P. Leong, John F. Beltrame, Stephen G. Worthley, Matthew I. Worthle
The microbiome of otitis media with effusion in Indigenous Australian children
No full textAbstract not available.Jake Jervis-Bardy, Geraint B. Rogers, Peter S. Morris, Heidi C. Smith-Vaughan, Elizabeth Nosworthy, Lex E.X. Leong, Renee J. Smith , Laura S. Weyrich, Jacques De Haan, A. Simon Carney, Amanda J. Leach , Stephen O’Leary, Robyn L. Mars
A lead silicate holey fibre with gamma=1860 W(-1)km(-1) at 1550 nm
No full textCopyright © 2005 Optical Society of AmericaJulie Y.Y. Leong, Periklis Petropoulos, Symeon Asimakis, Heike Ebendorff-Heidepriem, Roger C. Moore, Ken Frampton, Vittoria Finazzi, Xian Feng, Jonathan H.V. Price, Tanya M. Monro, David J. Richardso
Comparative Study of Turbo Equalization Schemes using Convolutional, Convolutional Turbo, and Block-Turbo Codes
No full textTurbo equalizers have been shown to be successful in mitigating the effects of inter-symbol interference introduced by partial response modems and by dispersive channels for code rates of . In this contribution, we comparatively studied the performance of a range of binary phase-shift keying turbo equalizers employing block-turbo codes, namely Bose–Chaudhuri–Hocquenghen turbo codes, convolutional codes, and convolutional turbo codes having high code rates, such as and , over a dispersive five-path Gaussian channel and an equally weighted symbol-spaced five-path Rayleigh fading channel. These turbo equalization schemes were combined with an iterative channel estimation scheme in order to characterize a realistic scenario. The simulation results demonstrated that the turbo-equalized system using convolutional turbo codes was the most robust system for all code rates investigated. Index Terms—Bose–Chaudhuri–Hocquenghen codes, convolutional codes, iterative decoding, iterative equalization, joint equalization and decoding, turbo codes, turbo decoding, turbo equalization
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