Publications

Deschamps, GA & Ziolkowski, RW 1986, 'Comparison of Clifford and Grassmann Algebras in Applications to Electromagnetics' in Clifford Algebras and Their Applications in Mathematical Physics, Springer Netherlands, pp. 501-515.
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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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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.

lyengar, NGR & Joshi, SP 1986, 'Optimal design of antisymmetric laminated composite plates', Journal of Aircraft, vol. 23, no. 5, pp. 359-360.
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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, 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.

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.

Ziolkowski, RW 1986, 'A path‐integral–Riemann‐space approach to the electromagnetic wedge diffraction problem', Journal of Mathematical Physics, vol. 27, no. 9, pp. 2271-2281.
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Ziolkowski, RW & Grant, JB 1986, 'Vortex Formation Near an Iris in a Rectangular Waveguide', IEEE Transactions on Microwave Theory and Techniques, vol. 34, no. 11, pp. 1164-1182.
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JACKSON, JD, MANN, SL, JOSHI, SS, CROUSE, DA & SHARP, JG 1970, 'FLOW CYTOMETRIC AND IMMUNOPEROXIDASE STAINING PATTERNS OF MONOCLONAL-ANTIBODIES RAISED AGAINST LYMPHOHEMATOPOIETIC STROMAL CELL-LINES', EXPERIMENTAL HEMATOLOGY, CARDEN JENNINGS PUBL CO LTD, pp. 512-512.

JOSHI, SS, TILDEN, PA, MANN, SL & SHARP, JG 1970, 'EVIDENCE FOR THE IMPORTANCE OF NK CELL-TARGET CELL-SURFACE INTERACTIONS IN THE REGULATION OF MALIGNANCY OF LYMPHOID-CELL LINES', FEDERATION PROCEEDINGS, FEDERATION AMER SOC EXP BIOL, pp. 630-630.

JOSHI, SS, TILDEN, PA, SHARP, JG & BRUNSON, KW 1970, 'MODULATION OF INVIVO MALIGNANCY AND INVITRO NK-SUSCEPTIBILITY OF RAW117 LYMPHOSARCOMA CELLS BY BUTANOL', PROCEEDINGS OF THE AMERICAN ASSOCIATION FOR CANCER RESEARCH, AMER ASSOC CANCER RESEARCH, pp. 62-62.

MANN, SL, JOSHI, SS, WEISENBURGER, DD, ARMITAGE, JO, KESSINGER, MA, VAUGHAN, WP & SHARP, JG 1970, 'DETECTION OF TUMOR-CELLS IN HISTOLOGICALLY NORMAL BONE-MARROW OF AUTOLOGOUS TRANSPLANT PATIENTS USING CULTURE TECHNIQUES', EXPERIMENTAL HEMATOLOGY, CARDEN JENNINGS PUBL CO LTD, pp. 541-541.

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, 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.

SINGH, R, BOKHARI, AA & JOSHI, SP 1970, 'A NEW METHOD OF JUNCTION FORMATION IN COMPOUND SEMICONDUCTORS BY RAPID ISOTHERMAL PROCESSING (RIP)', JOURNAL OF THE ELECTROCHEMICAL SOCIETY, ELECTROCHEMICAL SOC INC, pp. C177-C177.

WEISENBURGER, DD, JOSHI, SS & MIRVISH, SS 1970, 'INDUCTION OF B-CELL LYMPHOMA LEUKEMIA IN WISTAR RATS BY 2-HYDROXYETHYLNITROSOUREA (HENU)', PROCEEDINGS OF THE AMERICAN ASSOCIATION FOR CANCER RESEARCH, AMER ASSOC CANCER RESEARCH, pp. 98-98.