Publications

Ball, JE & Williams, BJ 1984, 'Characteristic schemes using fixed spatial grids.'.
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Characteristic schemes for the solution of the Saint Venant equations for unsteady flow in a fixed bed prismatic open channel without lateral inflow were examined. The study was restricted to schemes using a fixed spatial grid requiring interpolation between the characteristics and the grid. Five solution techniques which differed in their interpolation procedure and order of finite difference approximation were developed. The accuracy of the water level and flow rate predicted by each solution technique for different grid spacing were compared and mass balances were computed for each technique. (A)

Bird, T 1984, 'Comparison of asymptotic solutions for the surface field excited by a magnetic dipole on a cylinder', IEEE Transactions on Antennas and Propagation, vol. 32, no. 11, pp. 1237-1244.
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Jalaj, S, Singh, I & Joshi, SK 1984, 'Tight-Binding Calculations for the Angle-Resolved Local Density of States of InP(110) Surfaces', physica status solidi (b), vol. 126, no. 2, pp. 669-676.
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Johnson, WA & Ziolkowski, RW 1984, 'The scattering of an H-polarized plane wave from an axially slotted infinite cylinder: A dual series approach', Radio Science, vol. 19, no. 1, pp. 275-291.
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Miyanaga, Y, Miki, N & Nagai, N 1984, 'ARMA digital lattice filter based on a linear prediction theory', Electronics and Communications in Japan (Part I: Communications), vol. 67, no. 10, pp. 30-38.
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This paper proposes some elementary sections of an ARMA lattice filter. an ARMA lattice filter with an arbitrary AR order and an arbitrary MA order is presented. A conventional ARMA lattice filter has already been constructed by a method used to develop an AR lattice filter to a 2‐dimensional filter. Therefore the conventional filter is not suitable for a filter realization when an AR order and an MA order differ from each other, and for the design of a minimum realized ARMA model. the most important characteristic of lattice filters is an orthogonality between every prediction error calculated at each elementary section. Employing this characteristic, we employ the AR lattice filter in a speech analysis, synthesis, an equalizer, and so on. It is shown that the proposed ARMA lattice filter satisfies an orthogonality. Furthermore, the ARMA lattice inverse filter which is an analyzer for an observed waveform and the ARMA lattice filter which is a synthesizer for the waveform are presented. Copyright © 1984 Wiley Periodicals, Inc., A Wiley Company

Svirezhev, YM, Krysanova, VP & Voinov, AA 1984, 'Mathematical modelling of a fish pond ecosystem', Ecological Modelling, vol. 21, no. 4, pp. 315-337.
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Vigneswaran, S & Thiyagaram, M 1984, 'Application of filtration theories to ground water recharge problems', Water, Air, and Soil Pollution, vol. 22, no. 4, pp. 417-428.
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A mathematical model is formulated for filtration of different flow conditions (radial flow, spherical flow and combined radial and vertical downwards flow) from O'Melia's model for deep bed filtration. The simple ground water recharge problems with the above mentioned flow conditions are also presented. The radial flow mathematical model was verified using bench-scale radial flow experiments. The removal efficiency and headless in spherical flow and combined radial - vertical downwards flow models with equal bed volume were simulated. © 1984 D. Reidel Publishing Company.

Voinov, AA & Svirezhev, YM 1984, 'A minimal model of eutrophication in freshwater ecosystems', Ecological Modelling, vol. 23, no. 4, pp. 277-292.
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Waldron, KJ, Vohnout, VJ, Pery, A & McGhee, RB 1984, 'Configuration Design of the Adaptive Suspension Vehicle', The International Journal of Robotics Research, vol. 3, no. 2, pp. 37-48.
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The selection of vehicle and leg configuration and of power transmission and actuation system configuration for the adaptive suspension vehicle ( ASV) are discussed. The ASV will be a proof-of-concept prototype of a proposed class of transportation vehicles for use in terrain that is not passable for conventional vehicles. It uses a legged locomotion princi ple. The machine will not be an autonomous 'robot, ' in the sense that it will carry an operator. It will, however, have a very high level of machine intelligence and environmental sensing capability. Much of the technology involved is unique and has potential for application to future robot systems. In this paper, major aspects of the vehicle and leg geometry, the on-board processing configuration, and the hydrostatic power transmission system are discussed.

Ziolkowski, RW & Deschamps, GA 1984, 'Asymptotic evaluation of high-frequency fields near a caustic: An introduction to Maslov's method', Radio Science, vol. 19, no. 4, pp. 1001-1025.
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Ziolkowski, RW & Deschamps, GA 1984, 'The Asymptotic Poincaré Lemma and Its Applications', SIAM Journal on Mathematical Analysis, vol. 15, no. 3, pp. 535-558.
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Ziolkowski, RW, Johnson, WA & Casey, KF 1984, 'Applications of Riemann-Hilbert problem techniques to electromagnetic coupling through apertures', Radio Science, vol. 19, no. 6, pp. 1425-1431.
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Ball, JE & Williams, BJ 1970, 'CHARACTERISTIC SCHEMES USING FIXED SPATIAL GRIDS.', National Conference Publication - Institution of Engineers, Australia, I.E.Aust. Nat. Conf. Pub. No. 84/7, Barton, Adelaide, Australia, pp. 24-28.
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Characteristic schemes for the solution of the Saint Venant equations for unsteady flow in a fixed-bed prismatic open channel without lateral inflow were examined. The study was restricted to schemes using a fixed spatial grid requiring interpolation between the characteristics and the grid. Five solution techniques which differed in their interpolation procedure and order of finite difference approximation were developed. The accuracy of the water level and flow rate predicted by each solution technique for different grid spacings were compared and mass balances were computed for each technique.

Graham, LB & Hadgraft, RG 1970, 'FARM DAM CHANNEL BYWASHES.', National Conference Publication - Institution of Engineers, Australia, pp. 348-352.
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Channel bywashes are side discharge channel spillways, which provide an alternative to conventional farm dam bywashes on steep sites, or where hydraulic problems of very wide bywash outlet widths occur. They do not, however, offer a means of significantly reducing the width of return slope required for a particular project. Analysis of channel bywash flow requires an iterative step solution, using either a computer or powerful programmable calculator. The engineer must judge whether a conventional bywash or channel bywash is appropriate in a particular circumstance.

JOSHI, SS, JACKSON, JD, SHARP, JG & BRUNSON, KW 1970, 'DIFFERENTIAL EXPRESSION OF ANTIGENS ON THE PARENTAL AND A METASTATIC VARIANT OF THE RAW117 LYMPHOSARCOMA CELL-LINE', PROCEEDINGS OF THE AMERICAN ASSOCIATION FOR CANCER RESEARCH, AMER ASSOC CANCER RESEARCH, pp. 60-60.

Roper, H, Baweja, D & Kirkby, G 1970, 'TOWARDS A QUANTITATIVE MEASURE OF DURABILITY OF CONCRETE STRUCTURAL MEMBERS.', Publication SP - American Concrete Institute, pp. 639-658.
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Brief consideration is given to the uses of a quantitative measure of durability of concrete structural members. A classification scheme of structures, elements, and causes and effects is reviewed by the use of examples. Any quantitative measure of durability of in-situ structural members must be based on data gathered using non-destructive test methods. For any phenomenon such as cracking, corrosion or spalling which influences durability, three factors must be considered, a method of measurement of the phenomenon, the intensity of the phenomenon, and its distribution over the observed area.