Publications

Hadgraft, RG & Volker, RE 1981, A model for predicting aquifer recharge from rainfall and river flow..
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Groundwater management programs frequently require data on the response of the aquifer to its various inputs and outputs. A numerical model has been developed to assist in the assessment of recharge quantities. The model is designed to be capable of representing the processes of rainfall and river recharge, irrigation extraction and leakage to the sea.-from Authors

Bird, TS 1981, 'Investigation of crosspolarisation in offset Cassegrain antennas', Electronics Letters, vol. 17, no. 17, pp. 585-585.
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Cohen, GL & Shannon, AG 1981, 'John Ward's method for the calculation of Pi', Historia Mathematica, vol. 8, no. 2, pp. 133-144.
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What may be the last attempt to use geometric methods to calculate pi is found in a textbook published in England in 1707. The underlying algebraic and numerical methods are analyzed in this paper. © 1981.

Hadgraft, RG, Volker, RE & Stark, KP 1981, 'unknown', IN: PROC. 19TH IAHR CONGRESS, (NEW DELHI, INDIA: FEB. 1-7, 1981), vol. 4, New Delhi, India, IAHR, 1981, Subject-C(b), Paper 11.
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Dynamic programming and simulation have been used to study a water resource system involving a major surface storage and an aquifer located downstream. The aquifer provides approximately 250,000 ML of irrigation water annually and natural recharge is augmented by artificial recharge using river water. Results are presented from various operating rules to determine the optimal strategy of releases from the surface storage. The operating rules depend on factors such as reservoir level, expected inflows and water demands. (A)

Hoang, DB & Goodwin, GC 1981, 'Lower bound on one shot error probability', Electronics Letters, vol. 17, no. 7, pp. 261-261.
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A number of upper and lower bounds have been described in the literature for the error performance of digital communication channels for the case of white output noise.1,2 In this letter a lower bound on the probability of error for one shot communication over a general linear channel with coloured noise is derived. © 1981, The Institution of Electrical Engineers. All rights reserved.

Kumar, A & Waldron, KJ 1981, 'The Workspaces of a Mechanical Manipulator', Journal of Mechanical Design, vol. 103, no. 3, pp. 665-672.
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A new theory and a resulting algorithm for tracing the bounding surfaces of mechanical manipulator workspaces is presented. The natures of the numerous singular configurations and means of accommodating them within the algorithm are also studied. In order to sort surfaces of interest from the large number of possible solutions, a numerically implementable labelling technique is also presented. The algorithm is applicable to all practicable manipulator configurations with three, or more, degrees of freedom.

MISTREE, F, HUGHES, OF & PHUOC, HB 1981, 'AN OPTIMIZATION METHOD FOR THE DESIGN OF LARGE, HIGHLY CONSTRAINED COMPLEX SYSTEMS', Engineering Optimization, vol. 5, no. 3, pp. 179-197.
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SAYERS, BM, RUGGIERO, C & FEUERLICHT, J 1981, 'STATISTICAL VARIABILITY OF BIOMEDICAL DATA .1. THE INFLUENCE OF SERIAL-CORRELATION ON MEAN-VALUE ESTIMATES', MEDICAL INFORMATICS, vol. 6, no. 1, pp. 1-11.

SAYERS, BM, RUGGIERO, C & FEUERLICHT, J 1981, 'STATISTICAL VARIABILITY OF BIOMEDICAL DATA .2. THE INFLUENCE OF SERIAL-CORRELATION ON POWER ESTIMATES, AND ON COMPARATIVE TESTING OF SAMPLES', MEDICAL INFORMATICS, vol. 6, no. 3, pp. 207-220.
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Sun, JWH & Waldron, KJ 1981, 'GRAPHICAL TRANSMISSION ANGLE CONTROL IN PLANAR LINKAGE SYNTHESIS.', Mechanism & Machine Theory, vol. 16, no. 4.
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It has long been recognized that in the design of 4-bar mechanisms, control of the transmission angle is one of the many important design criteria. Graphical techniques are presented which permit control of the maximum transmission angles (the transmission angle is here taken as the angle between the coupler and the normal to the driven crank) in the design positions for precision position linkage synthesis. This method does not directly control the maximum transmission angle magnitude throughout a motion cycle. It does permit elimination of all solutions whose transmission angle magnitude exceed nominated limits in the design positions. The constructions involve only circles and lines. Two numerical examples are given to illustrate and present a step-by-step graphical implementation of this new technique to a motion generation problem and a function generation problem.

VOINOV, AA & SVIREZHEV, YM 1981, 'STABILITY OF A SIMPLE FRESH-WATER ECOSYSTEM MODEL', ZHURNAL OBSHCHEI BIOLOGII, vol. 42, no. 6, pp. 936-940.

Bakoss, SL, Faulkes, KA & Pulmano, VA 1970, 'DETERMINATION OF CREEP AND SHRINKAGE CHARACTERISTICS FOR THE PREDICTION OF THE LONG-TERM DEFORMATIONS OF REINFORCED CONCRETE BEAMS.', National Conference Publication - Institution of Engineers, Australia, pp. 31-36.

Hadgraft, RG, Volker, RE & Stark, KP 1970, 'OPTIMAL CONJUNCTIVE OPERATION OF A SURFACE RESERVOIR AND AN AQUIFER.', Proceedings, Congress - International Association For Hydraulic Research, pp. 183-191.

Litherland, KL, Oakley, DR & Proctor, BA 1970, 'The use of accelerated ageing procedures to predict the long term strength of GRC composites', Cement and Concrete Research, Asia-Pacific Conference on FRP in Structures, Elsevier BV, Melbourne, Australia, pp. 455-466.
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This paper presents experimental results and observations to-date of an ongoing research undertaken to investigate the long-term behaviour of bond between externally bonded Carbon Fibre Reinforced polymer (CFRP) and concrete. Carbon FRP strips were externally bonded to concrete prisms and were exposed separately to three different environmental conditions, namely, temperature, humidity and outdoor environment for extended durations. Single-lap-joint shear test (pull-out test) was conducted to investigate bond strengths of control (unexposed) and exposed specimens. Moreover, material characterisation of concrete cylinders and CFRP control and exposed coupons was carried out to observe the changes of mechanical properties with the time of exposure. Finally, experimental results of exposed specimens were compared to those of control specimens in terms of bond strengths and failure modes. Based on the results to-date, the most significant degradation of bond strength was observed in specimens exposed to outdoor environment. Whereas no significant effect of temperature cycles were found provided that the temperature is below the glass transition temperature of epoxy resin.

Song, SM & Waldron, KJ 1970, 'THEORETICAL AND NUMERICAL IMPROVEMENTS TO AN INTERACTIVE LINKAGE DESIGN PROGRAM - RECSYN.', Proceedings - OSU Applied Mechanisms Conference (Oklahoma State University).

Tanner, RI & Phuoc, HB 1970, 'Analysis of Fibre Spinning', Numerical Methods for Coupled Problems, Pineridge Press, University College, Swansea, UK, pp. 127-136.

Waldron, KJ & Kinzel, GL 1970, 'RELATIONSHIP BETWEEN ACTUATOR GEOMETRY AND MECHANICAL EFFICIENCY IN ROBOTS.', pp. 366-374.

Phuoc, HB & Tanner, RI United Kingdom Atomic Energy Authority 1981, Finite Element Program Results, Numerical Solutions for A Comparison Problem on Natural Convection in an Enclosed Cavity, (ed. L.P. Jones and C.P. Thompson), AERE-R 9955, United Kingdom Atomic Energy Authority, Harwell, England, pp. 110-112, January 1981., no. AERE - R 9955, pp. 110-112, Harwell, Oxfordshire, England.