6,813 research outputs found
Size and scale effects in composites: II. Unidirectional laminates
No full textThis paper is concerned with the scale and size effects in the strength characterisation of composite materials with particular reference to hand laid-up unidirectional laminates. Attention has been focused on the tensile and flexural strengths of glass/epoxy and carbon/epoxy laminates. The experiments have been designed through the use of statistical, factorial-based techniques, whereby a more comprehensive analysis of the inter-relationship between different parameters and their influence on strength can be made. The work highlights the importance of fabrication factors and the distinguishing difference between scale effects and size effects
Size and scale effects in composites: I. Literature review
No full textThis paper is concerned with a review of the size and scale effects involved in the prediction of strength of fibre-reinforced-plastic (FRP) composite materials and structures. The review covers the basic principles in the establishment of scaling laws and the application of the Buckingham-Pi theorem. An analysis of various theories used in categorising size effects, such as the weak link, extended weak link and fracture mechanics approaches, is presented. This is followed by an examination of the literature devoted to scaling issues in FRP composites
Size and scale effects in composites: III. Woven-roving laminates
No full textThis paper is concerned with scale and size effects in the strength characterisation of composite materials with particular reference to woven-roving laminates. Attention has been focused on the tensile and flexural strengths of glass/polyester laminates fabricated by hand lay-up techniques. Factorial experiments have been designed to allow investigation of the joint influence of different factors on strength. The work highlights the importance of fabrication factors and the distinguishing difference between scale effects and size effects
Use of statistically designed experiments to explore sensitivities in the strength scaling of FRP composites.
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No full textHere is a curious book. Its title-page declares "The Artist's Book of Fables" but its pre-title-page has "Fables, Original and Selected, with a Memoir of the Author." After that title-page, it is identical with "Fables, Original and Selected" as in our copy printed by John Murray in 1833. There is again an AI at the front and an index of engravings and engravers at the back. I found that copy twenty years ago. I had found an inferior copy twenty-two years before that. At that time, I noted Aesopic fables here including "Stone Broth" and "The Mouse and the Oyster."This is a hardbound book (hard cover)James Northcote, R.A
A fair-tale for grown-ups: Christian orthodoxy in the theology of C.S. Lewis
No full textThis thesis investigates C.S. Lewis as one of the most successful Christian apologists of this century. It begins by looking at his influence as part of a movement of lay orthodoxy in the twentieth century, and examining some of the reasons for the emergence of that movement. In the context of this discussion, several key influences are explored. Charles Williams and G.. Chesterton are examined as contemporaries who helped shape Lewis' specifically Christian theology, Edwyn Bevan as an influence on his philosophy of God, Baron von Hugel as a beacon of light in the Modernist crisis, and Rudolf Otto as the primary source of Lewis' synthesis of the rational and the non-rational in his theology. The thesis then goes on to explore three areas where Lewis had a distinctive contribution to make to modern orthodox belief The first of these is the assertion that , he was making an attempt to resurrect Romanticism in some form in theology, in contrast to such figures as Kari Barth, for whom Romantic philosophy was part of the entire problem of the Liberal enterprise. The second area is the regaining of a Christian imagination concerning the life to come and of the doctrines of Heaven and Hell. It will be argued that Lewis' doctrine of Transposition offers suggestions as to an alternative to self-defeating reductionism in this area of Christian thought. The third area is Lewis’ engagement with the ideas and philosophies of his day, and in particular his hostility towards Scientific Materialism. This will be examined through his use of the literary - genre of Utopia/Dystopia to critique materialist and relativist positions. His work will be explored alongside two examples of the genre - H.G. Wells and Yevgeny Zamyatin - to place him in the context of the discussion of possible human fixtures of his time. The thesis will argue that C.S. Lewis was the foremost exponent of a group of lay Christians who were concerned to restate orthodox Christian belief in the modem context. It will argue that Lewisian orthodoxy was a credible and complex construct which encompassed the rational and the non-rational, the moral and the numinous, the intellect and the imagination. Ultimately it will argue that Lewis offers theological suggestions as to the solution of the lost unity of heart and mind - the "dissociation of sensibility" - which the Romantics sought
Predicting the motions of high speed RIBs: a comparison of non-linear strip theory with experiments
No full textAccurate prediction of the motions of high speed craft is an essential element in understanding the response of crew to a particular design configuration. The aim of this work is to evaluate the capability of a numerical method for use in the context of a procedure for designing high speed craft. A numerical model is used to predict the motions of a planing craft in both regular and irregular waves. The model is based on non-linear strip theory, through calculation of the forces occurring on wedge impact. This numerical model and its limitations are well understood for lower planing speeds (up to a length based Froude number of around 1.2). This paper investigates the limitations and accuracy for higher speed craft (Froude number around 3). At present there is an inadequate knowledge of the model performance at these speeds. Lower speed validation is carried out using results from published experiments although this data does not extend to the higher speeds. Validation of the model at higher speeds is achieved using experimental data attained from testing two scale models: A wave piercing rigid inflatable boat (RIB) and an Atlantic 21 RIB. The experiments are conducted in a range of regular wave frequencies for three wave height together with a realistic JONSWAP sea spectrum. Results are promising, with good correlation between the heave motion of the numerical model and the measured experimental data. Based on these results, a number of potential enhancements to the existing numerical model are discussed
A comparison of experimental measurements of high-speed RIB motions with non-linear strip theory
No full textAccurate prediction of the motions of high-speed craft is an essential element in understanding the response of crew to a particular design configuration. The aim of this work is to evaluate the capability of a numerical method for use in the context of a procedure for designing high-speed craft. A numerical model is used to predict the motions of a planing craft in regular waves. The model is based on non-linear strip theory, through calculation of the forces occurring on wedge impact. This numerical model and its limitations are well understood for lower planing speeds (up to a length-based Froude number of around 1.2). This paper describes the limitations and accuracy for higher-speed craft (Froude number around 3). At present there is an inadequate knowledge of the model performance at these speeds. Validation of the model is achieved using experimental data obtained from testing two scale models: A wave piercing rigid inflatable boat (RIB) and an Atlantic 21 RIB. The experiments are conducted in a range of regular wave frequencies for three wave heights. Results are promising, with good correlation between the heave motion of the numerical model and the measured experimental data. Based on these results, a number of potential enhancements to the existing numerical model are discussed
7 International Immunoglobulin Conference : Neurology
No full textData presented demonstrate the versatility of immunoglobulin (Ig) therapy for a variety of neurological disorders with different pathogenesis and presentations. In indications where the efficacy of Ig is well established, the neurology community is striving to improve the use of this valuable and limited resource by perfecting best practice guidelines, individualizing dosing schemes and investigating combination therapies to enhance treatment benefit. The data showing the efficacy of Ig therapy in conditions such as chronic pain and autoimmune encephalitis are promising. Future challenges for Ig use in neurological disorders were also outlined. Ongoing and upcoming randomized controlled trials will be pivotal to the use of Ig in the future, by identifying responder groups and elucidating the most effective administration practices. As our understanding and use of the therapy increases, it is essential that we collect data on the effects of long-term Ig treatment in neurological conditions, of which very little currently exists
7th International Immunoglobulin Conference : Neurology
No full textData presented demonstrate the versatility of immunoglobulin (Ig) therapy for a variety of neurological disorders with different pathogenesis and presentations. In indications where the efficacy of Ig is well established, the neurology community is striving to improve the use of this valuable and limited resource by perfecting best practice guidelines, individualizing dosing schemes and investigating combination therapies to enhance treatment benefit. The data showing the efficacy of Ig therapy in conditions such as chronic pain and autoimmune encephalitis are promising. Future challenges for Ig use in neurological disorders were also outlined. Ongoing and upcoming randomized controlled trials will be pivotal to the use of Ig in the future, by identifying responder groups and elucidating the most effective administration practices. As our understanding and use of the therapy increases, it is essential that we collect data on the effects of long-term Ig treatment in neurological conditions, of which very little currently exists
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