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.
Cameron, GR 1986, 'Small business is big business', Journal of Marketing Management, vol. 2, no. 1, pp. 31-37.
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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.
Li, J, Maohua, W & Qingzhi, H 1986, 'Study in Mixed Mode Fatigue Crack Propagation in a Stiffened Sheet', Acta Aeronautica et Astronautica Sinica, vol. 7.
Miki, N, Saga, S, Miyanaga, Y & Nagai, N 1986, 'ARMA spectral estimation using weighted model identification systems.', Journal of the Acoustical Society of Japan (E), vol. 7, no. 1, pp. 21-28.
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Recently, a model identification system (MIS) has been studied for ARMA parameter estimation. Since in MIS an estimator with a high-order ARMA parameter and a model reduction algorithm are used, the tracking ability of the spectral estimation is good. However in real speech analysis, estimation errors are caused by the use of a low-pass filter for A/D conversion. In order to compensate for this estimation error we propose a weighted MIS (WMIS) which includes a compensation for the characteristics of the low-pass filter. The WMIS estimates the input of the reference model and time-varying ARMA parameters, and achieves the property of rapid convergence by using a high order model. Furthermore the algorithm for minimum realization is shown as a model reduction algorithm. The proposed algorithms are applied to synthetic speech and real speech, and it is shown that the estimated spectra sufficiently represent the variation of formants without jitters in the high-frequency part. © 1986, Acoustical Society of Japan. All rights reserved.
Miyanaga, Y, Miki, N & Nagai, N 1986, 'Adaptive identification of a time-varying ARMA speech model', IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. 34, no. 3, pp. 423-433.
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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.
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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Waldron, KJ & McGhee, RB 1986, 'The mechanics of mobile robots', Robotics, vol. 2, no. 2, pp. 113-121.
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The interaction of the mechanics of a mobile platform with control and sensing hardware and software is important to performance in robotic applications. In this paper the basic principles involved will be reviewed, and new material on comparative characterizations will be presented. The application of those principles to a specific example: the Adaptive Suspension Vehicle, will be presented. © 1986.
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.
Waldron, KJ & Reidy, J 1970, 'STUDY OF A KINEMATICALLY REDUNDANT MANIPULATOR STRUCTURE.', pp. 1-8.
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Six degrees of freedom is only the minimum requirement for a manipulator to have full spatial positioning capability. However, effective use of more than six degrees of freedom is not a simple problem. Those systems with redundant degrees of freedom which have been successfully operated are based on end-point sensing. The authors deal with ways of making effective use of additional degrees of freedom in conventional, open-loop, industrial-robot-type operation.
