Ball, JE & Henderson, FM 1986, 'Tidal influence upon flow in rivers.'.
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Increasing development along coastal regions has resulted in engineers and water resource managers having to become conversant with the interaction between flow, flood or otherwise, in rivers and the tidal cycle in the ocean. The tidal cycle and its interaction with river flows is an example of unsteady flow. Consequently, determination of the interaction between the tidal cycle and the river flows requires solution of the unsteady flow equations. This paper presents results from a solution of the non dimensional unsteady flow equations for alternative tidal and river conditions. Also presented is a summary of the algorithm used for the numerical solution of the non dimensional unsteady flow equations.
Ball, JE & Henderson, FM 1986, 'Tidal influence upon flow in rivers.'.
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Increasing development along coastal regions has resulted in engineers and water resource managers having to become conversant with the interaction between flow, flood or otherwise, in rivers and the tidal cycle in the ocean. The tidal cycle and its interaction with river flows is an example of unsteady flow. Consequently, determination of the interaction between the tidal cycle and the river flows requires solution of the unsteady flow equations. This paper presents results from a solution of the non dimensional unsteady flow equations for alternative tidal and river conditions. Also presented is a summary of the algorithm used for the numerical solution of the non dimensional unsteady flow equations.
Bird, T, James, G & Skinner, S 1986, 'Input mismatch of TE<inf>11</inf>mode coaxial waveguide feeds', IEEE Transactions on Antennas and Propagation, vol. 34, no. 8, pp. 1030-1033.
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Bird, TS 1986, 'Erratum: Finite-element analysis of leaky waveguide antennas', Electronics Letters, vol. 22, no. 18, pp. 967-967.
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Bird, TS 1986, 'Finite-element analysis of leaky waveguide antennas', Electronics Letters, vol. 22, no. 13, pp. 697-697.
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Bird, TS, James, GL, Poulton, GT & Thomas, BMA 1986, 'ANTENNA DESIGN PRINCIPLES FOR SATELLITE COMMUNICATIONS.', Journal of Electrical and Electronics Engineering, Australia, vol. 6, no. 1, pp. 6-13.
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The antenna configurations used for both earth stations and satellites are considered in some detail following an introduction outlining relevant basic antenna principles. The specifications applicable to antennas used for satellite communications and their effects on the design of the antennas are considered. Examples of both earth-station and satellite antennas and their characteristics are illustrated by reference to the INTELSAT and AUSSAT networks. Future trends in earth-station and satellite antenna design ae also considered.
Bone, DJ, Bachor, H-A & Sandeman, RJ 1986, 'Fringe-pattern analysis using a 2-D Fourier transform', Applied Optics, vol. 25, no. 10, pp. 1653-1653.
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Bone, DJ, Bachor, H-A & Sandeman, RJ 1986, 'Spectral line interferometry with temporal and spatial resolution', Optics Communications, vol. 57, no. 1, pp. 39-44.
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BRAUN, RM & DOWNING, BJ 1986, '35 GHZ PHASE-LOCKED GUNN SOURCE BASED ON CURRENT HUMP PHASE DETECTION', ELECTRONICS LETTERS, vol. 22, no. 11, pp. 575-577.
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The letter describes the implementation of a phase-locking scheme described earlier to a 35 GHz Gunn solid-state source (SSS). The CLTF is developed, a loop filter is chosen and the response to a step disturbance is measured. This response is compared to the theoretical response obtained by a Runge-Kutta simulation.
CHIARELLA, C & SHANNON, AG 1986, 'AN EXAMPLE OF DIABETES COMPARTMENT MODELING', MATHEMATICAL MODELLING, vol. 7, no. 9-12, pp. 1239-1244.
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A general biomedical two-compartment model is described and analyzed. An application in diabetes research is then illustrated by reference to a study which is comparing subcutaneous and intravenous insulin kinetcs.
LOGANATHAN, P & ATPUTHARAJAH, PP 1986, 'EFFECTS OF FERTILIZERS ON YIELD AND LEAF NUTRIENT CONCENTRATIONS IN COCONUT', TROPICAL AGRICULTURE, vol. 63, no. 2, pp. 143-148.
Schiebel, EN, Busby, HR & Waldron, KJ 1986, 'Design of a mechanical proximity sensor', Robotica, vol. 4, no. 4, pp. 221-228.
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SUMMARYA proximity sensor using a mechanical contact principle is under development for robotic applications. Good discrimination between contact loads and inertial windage loads is essential. Rugged design and easy replacement of sensing elements is also necessary. The sensor is under consideration for use on the feet of the Adaptive Suspension Vehicle.
Vigneswaran, S & Jing Song, C 1986, 'Mathematical modelling of the entire cycle of deep bed filtration', Water, Air, and Soil Pollution, vol. 29, no. 2, pp. 155-164.
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This study proposes a mathematical model which was developed from the 'O'Melia-Ali' and 'Adin-Rebhun' models, to describe the entire filtration cycle. The three coefficients appearing in this model were calculated for different operating conditions using 30 cm depth filter experiments. The concentrations and headloss profiles simulated for different filter depths using these coefficients were found to fit very well with experimental results. © 1986 D. Reidel Publishing Company.
Vigneswaran, S & Setiadi, T 1986, 'Flocculation study on spiral flocculator', Water, Air, and Soil Pollution, vol. 29, no. 2, pp. 165-188.
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Traditionally, the Jar Test has been used to assess the suitability of flocculation treatment for a given raw water. Unfortunately, the Jar Test suffers from a number of disadvantages. The new method of assessment of flocculation, Spiral Flocculator, has been claimed to be a better method than the Jar Test apparatus and a good method for continuous assessment of flocculation. This study compares the performance of Spiral Flocculator and Jar Test, and mathematical modeling of the Spiral Flocculator performance. The experiments conducted reveal that the Spiral Flocculator has a better effective energy dissipation compared to that of Jar Test. However, the size of flocs in Spiral Flocculator seems to be overestimated relative to the real flocculator and Jar Test. © 1986 D. Reidel Publishing Company.
Vigneswaran, S, Balasuriya, BLN & Viraraghavan, T 1986, 'Anaerobic wastewater treatment - Attached growth and sludge blanket process', ENVIRON. SANIT. REV., vol. No. 19-20, pp. 1-101.
Vijaykumar, R, Waldron, KJ & Tsai, MJ 1986, 'Geometric Optimization of Serial Chain Manipulator Structures for Working Volume and Dexterity', The International Journal of Robotics Research, vol. 5, no. 2, pp. 91-103.
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Broadly speaking, the regional structure of a manipulator, which consists of the three inboard joints and their associated members, determines the workspace shape and volume. The orientation structure, which for a six-degrees-of-free dom manipulator consists of the three outboardjoints and members, determines the geometric dexterity or orientation potential of the manipulator. It is possible to determine the optimal dimensions of the regional structure for a given total length, using straightforward geometric arguments. By the use of the spherical counterpart of Grashof's theorem formu lated by Freudenstein (1964-65), it is also possible to show that there is an optimum geometry of the orientation structure. Two methods of characterizing geometric dexterity are utilized in this paper. The first is the concept of a dexterous workspace, which is a portion of the workspace within which the hand may assume any orientation. Although the dex terous workspace is a very useful concept for theoretical purposes, it is of limited practical utility because mechanical joint motion limits usually preclude its existence in real industrial robot structures. The second method of character izing geometric dexterity is to trace the portion of the work space within which the hand can assume a specified orienta tion. In this paper, the geometric conditions for the existence of a dexterous workspace are formulated for geometrically optimum, six-revolute manipulator structures. The optimiza tion criteria used include,freedom from geometric singular ities. We show that for an optimal geometry, singular posi tions can be completely excluded with small reductions of the joint motion ranges. These reductions have a negligible effect on the geometric performance of the system.
Waldron, K 1986, 'Force and motion management in legged locomotion', IEEE Journal on Robotics and Automation, vol. 2, no. 4, pp. 214-220.
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Watterson, PA 1986, 'Infinite contraction in force-free magnetic field evolution in cylindrical geometry', Journal of Plasma Physics, vol. 35, no. 2, pp. 273-293.
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This paper provides a new formulation of the resistive force-free evolution of cylindrically symmetric magnetic fields subject to purely radial motions. It is shown analytically that the evolution bounded by a perfect conductor ceases to exist after a finite time if the initial field has total axial flux of opposite sign to the field on the axis of symmetry. A numerical solution indicates that the evolution ceases to exist owing to the unlimited contraction of the field profile producing a line of infinite current density. The asymptotic form of this ‘blow-up’ is identified as the particular self-similar contraction for which the field direction is exactly reversed in the limit of large radius. Possible applications to solar flares and the reversed-field pinch are discussed.
Bone, DJ, Bachor, H-A & Sandeman, RJ 1970, 'Automated Analysis of Interferograms', Fourth Conference of the Australian Optical Society.
Poulton, GT & Bird, TS 1970, 'IMPROVED REAR-RADIATING WAVEGUIDE CUP FEEDS.', IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), pp. 79-82.
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An improved rear-radiating coaxial waveguide feed is described with application to small compact antennas. The antenna feed comprises a coaxial waveguide radiator with a center conductor extending to the reflector vertex. A coaxial waveguide operating in the TE//1 //1 mode is excited by circular waveguide. The radiation pattern is modified by adjusting the length of the cup rim, or by using a coaxial slot. The various regions may be dielectric-loaded, providing increased design flexibility as well as mechanical support for the cup.
Roper, H, Baweja, D & Kirkby, GA 1970, 'PRODUCTION AND CHARACTERIZATION OF FLY ASH FROM NEW SOUTH WALES COALS.', Materials Research Society Symposia Proceedings, pp. 115-124.
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Factors affecting fly ash characteristics are examined by consideration of the various processes and constituents involved in its production. Coal conversion, boiler-furnace operations and collection procedures are discussed. Current classification schemes applied to fly ash, in particular to those for use as a pozzolanic mineral admixture in concrete are reviewed. The variability of the material is highlighted using physical and chemical data. Shape and size characteristics of selected fly ashes from sources within New South Wales, Australia are illustrated by electron micrographs.
Roper, H, Kirkby, G & Baweja, D 1970, 'Long-term durability of blended cement concretes in structures', American Concrete Institute, ACI Special Publication, pp. 463-482.
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Although abundant data are available on early-age properties of blended cement concretes, relatively little Information has been published on the long-term durability of blended cement concretes In service. The paper Is a summary of an Investigation of over two hundred structures In Australia. Some of these have service lives In excess of twenty years. Cored materials from some of the structures are described, and petrological and mineralogical examination allow conclusions on the efficacy hydration processes under field curing to be made. Porosity and permeability is discussed. Carbonation and corrosion effects on long-term durability are considered by the examination of data obtained from in situ concretes. The interactions between cement content and water: cement ratio on carbonation rate is discussed, and data from concretes both from in service and laboratory mixes are considered. Cracking is the predominant defect observed on most of the examined concrete surfaces and the role of pozzolans on elastic deformations, creep and shrinkage of concrete in structures is discussed. Data suggest that, for those structures studied, the long-term durability of blended cement concretes is at least the equal of ordinary portland cement concretes under service conditions.
Roper, H, Kirkby, G & Baweja, D 1970, 'LONG-TERM DURABILITY OF BLENDED CEMENT CONCRETES IN STRUCTURES.', Publication SP - American Concrete Institute, pp. 463-482.
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Relatively little information has been published on the long-term durability of blended cement concretes in service. The paper is a summary of an investigation of over two hundred structures in Australia. Some of these have service lives in excess of twenty years. Cored materials from some of the structures are described, and petrological and mineralogical examination allow conclusions on the efficacy hydration processes under field curing to be made. Porosity and permeability is discussed. Carbonation and corrosion effects on long-term durability are considered by the examination of data obtained from in situ concretes.
Vigneswaran, S & Setiadi, T 1970, 'SPIRAL FLOCCULATOR: MATHEMATICAL MODELLING AND EXPERIMENTS.'.
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Spiral flocculator has been claimed to be a good method for continuous assessment of flocculation in water treatment plant, and overcome most of the limitations experienced in jar test procedure. This paper deals with the mathematical modelling of spiral flocculator performance. The effluent turbidity, and temporal variation of floc size and floc density were related to the velocity gradient and influent concentrations. These formulations were then verified with the experimental results obtained from the laboratory-scale spiral flocculator experimental study. The experimental study also revealed that the spiral flocculator has a better effective energy dissipation compared to that of jar test although the size of flocs in spiral flocculation seems to be overestimated relative to the real flocculator.
Ying, MS 1970, 'FIRST ORDER FUZZY PREDICATE LOGIC (I).', Proceedings of The International Symposium on Multiple-Valued Logic, pp. 242-247.
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Some tools for analyzing fuzzy measures (Sugeno's integrals, etc. ) are introduced into the semantics of first-order predicate logic to explain the concept of fuzzy quantifiers. The truth value of a fuzzy quantification proposition is represented by Sugeno's integral. With this framework, the concepts of formation rules, fuzzy valuations, and fuzzy validity are discussed.
