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181 results on '"Chilvers, G. A."'

30. Differentiating Pakistani long-grain rice grown inside and outside the accepted Basmati Himalayan geographical region using a ‘one-class’ multi-element chemometric model

Author

Arif, M., primary, Chilvers, G., additional, Day, S., additional, Naveed, S.A., additional, Woolfe, M., additional, Rodionova, O.Ye., additional, Pomerantsev, A.L., additional, Kracht, O., additional, Brodie, C., additional, Mihailova, A., additional, Abrahim, A., additional, Cannavan, A., additional, and Kelly, S.D., additional

Published
2021
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32. Analysis of the structural behaviour of grouted pile/sleeve connections for offshore structures

Author

Chilvers, G. A.

Subjects
623.8, TA Engineering (General). Civil engineering (General)
Abstract

Existing experimental results are studied to determine the factors (including those not previously identified) affecting the strength of grouted connections. The current bond strength formula is evaluated and its limitations noted. Previous analytical work is examined and strengths and weaknesses investigated. A nonlinear finite element analysis is developed using a friction gap element to model the steel/grout bond. This includes a dilation effect when slip occurs and successfully simulates the behaviour of plain pipe connections up to ultimate load. An elastic-plastic, work-hardening, cracking and crushing constitutive model is developed to represent the behaviour of grout material. This is used for a detailed finite element analysis of the load-slip behaviour of individual shear keys of various shapes. The friction-gap element is adapted to give a representation of the shear keys using data derived from the detailed shear key analysis. A confinement factor is used to give higher ultimate shear key loads when the bond opening is small. This accounts for the observed fact that higher key loads are achieved with increased sleeve and pile dimensions due to greater confinement of the grout. Load-slip behaviour and strains up to ultimate load for shear keyed connections are successfully simulated using the friction-gap element. Bond stress distributions show that high normal bond stress concentrations are necessary to balance the bending moments in the grout annulus. Various extreme geometries are analysed and their failure modes determined. The effects of connection length, stiffeners, alternative loading arrangements, scale and shear key geometry are also fully investigated. Results are used to produce a new bond strength formula which takes into account most factors affecting bond strength and is stle to give good results over the full rang of geometries. Experimental tests have been conducted to determine the coefficient of friction between shot-blasted steel and grout for use in the numerical analyses.

Published
1984

35. Abstracts Of Contributed Papers — National Plant Pathology Conference, Sydney, May 1974

Author

Arentz, F., Heather, W. A., Pratt, B. H., Burnbieris, M., Marks, G. C., Kassaby, F. Y., Pratt, B. H., Shepherd, C. J., Heather, W. A., Taylor, P. A., Pratt, B. H., Heather, W. A., shepherd, C. J., Bertus, A. L., Walker, J., Chou, C. K. S., Marks, G. C., Minko, G., Chou, C. K. S., van Kraayenoord, C. W. S., Hartigan, D. T., Alcorn, J. L., Mayfield, A. H., Clare, B. G., Dube, A. J., Wildermuth, G. B., Rees, R. G., Keogh, R., Sanderson, F. R., Blackstock, J. M., Ikegami, M., Francki, R. I. B., Moghal, S. M., Francki, R. I. B., Price, R. D., Blackstock, J., McGechan, J. K., Bowyer, J. W., Gibbs, A. J., Skotnicki, A., Brown, R. H., Brown, R. H., Meagher, J. W., Brown, R. H., Davies, Kerrie A., Fisher, J. M., McLeod, R. W., Burnett, W. M., Goss, Olga M., Banyer, R. J., Colbran, R. C., McCulloch, Janet S., Htay, Khin, Roberts, W. P., Cother, E. J., Fahy, P. C., Lloyd, A. B., Shamsuddin, M. N., Praed, Joan, Moffett, Melda L., Allen, R. N., Biggs, D. R., Rezaian, M. A., Francki, R. I. B., Simpson, R. S., Scott, K. J., Walker, J., Burdon, J. J., Chilvers, G. A., Jenkins, P. T., Emmett, R., Pascoe, I., Kajornchaiyakul, P., Phon, C. J., Sanson, Martha, Weste, Greta, Parr-Smith, Pamela, Williams, P. G., Smith, A. M., Wildermuth, G. B., Kollmorgen, J. F., Wong, P., Kassaby, F. Y., Kile, G. A., Irwin, J. A. G., MacNish, G. C., Chin, J. C., Scott, K. J., Seviour, R. J., Chilvers, G. A., Gerrettson-Cornell, L., Whan, J. H., Muirhead, I. F., Blackstock, J. M., Sutton, J., Garrett, R. G., Sutton, J., Leggat, Frances W., Williams, P. F., O’Brien, P. C., Fisher, J. M., Brown, R. H., lnglis, I. M., Broadley, R. A., Broadley, R. A., Khair, G. T., McLeod, R. W., Sauer, M. R., Meagher, J. W., Clare, B. G., Shepherd, C. J., Totterdell, C. J., Stynes, B. A., Wallace, H. R., Arnold, J. R., Brown, J. F., Kochrnan, J. K., Siddiqui, M. Q., Rees, R. G., Kajornchaiyakul, P., Allen, S. J., McGee, D. C., McGee, D. C., Hartigan, D. T., Williams, P. F., Bamber, R. K., Delmas, Rosanne, and Dowden, H.

Published
1974
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46. THE DEVELOPMENT OF MYCORRHIZAL POPULATIONS ON POT-GROWN SEEDLINGS OF EUCALYPTUS ST-JOHNII R.T. BAK.

Author

Chilvers, G. A. and Gust, L. W.

Subjects
*MYCORRHIZAL fungi, *EUCALYPTUS, *ROOT diseases, *AGRICULTURAL pests, *PLANT populations, *SHOOT apexes
Abstract

The development of a population of mycorrhizas on the root system of a pot-grown Eucalyptus seedling has many of the characteristics of a disease epidemic. For example, the number of mycorrhizal apices tends to increase exponentially in the early stages. The disposition of these mycorrhizal apices is non-random, a fact which should engender care when sampling during field surveys. The final pattern of distribution of mycorrhizal apices within the root system reflects the degree of pre-infective ectotrophic spread, the frequency and location of primary infection events, the perpetuation of mycorrhizal apices by forward growth, the extent to which they proliferate by branching, and the contribution of later secondary infections from mycorrhiza- derived inoculum. The relative importance of these different processes is determined, as in a plant disease, by interaction between prevailing fungal, plant and environmental factors. The importance of inoculum availability and the capabilities of the fungus with respect to different regions of the root surface are stressed. The different modes of origin of mycorrhizal apices must be taken into account in any studies which seek to understand the mechanisms involved in conversion of normal root apices into mycorrhizas. [ABSTRACT FROM AUTHOR]

Published
1982
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