Bajracharya, K & Vigneswaran, S 1990, 'Adsorption of cadmium and zinc in saturated soil columns: Mathematical models and experiments', Environmental Technology (United Kingdom), vol. 11, no. 1, pp. 9-24.
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It vas found from experiments that adsorption of Cd and Zn in the dynamic system was higher than that in the static systea. Equilibrium Adsorption Model (EAM) and Two Site Adsorption Model (TSAM) have been validated with the observed concentration history curves of Cd and Zn. In most of the cases the EAM model with dynamic isotherm constants fitted the observed concentration history curves satisfactorily. In those where EAM did not fit well (using Dynamic isotherm constants), the TSAM predicted more accurately. The general conclusion is that for highly adsorbing solutes, EAM is a simple and quite satisfactory model for the prediction of concentration profiles both temporally and spatially. © 1990 Publications Division Selper Ltd.
Bajracharya, K & Vigneswaran, S 1990, 'Competitive adsorption of solutes in saturated soil columns: Mathematical model and experiments', Environmental Technology (United Kingdom), vol. 11, no. 1, pp. 25-32.
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Results of competitive adsorption column experiments of Cadmiua (Cd) and Zinc (Zn) are discussed. A mathematical model termed as Competitive Dynamic Adsorption Model (CDAM) to predict the solute concentration in the multi‐solute system is presented. The CDAM is verified using concentration history curves of Cd and Zn obtained from saturated column experiments. © 1990 Taylor and Francis Group, LLC.
Ball, JE 1990, 'Unsteady flow model for urban drainage systems', Transactions of the Institution of Engineers, Australia. Civil engineering, vol. CE32, no. 2, pp. 66-74.
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A numerical model which uses the algorithm presented by Ball (1) and the results of an investigation into the relative importance of the terms in the full dynamic wave equation of motion presented by Ball (2) for the prediction of unsteady flow propagation within an urban drainage system is presented. Results obtained from the use of the proposed model and also from use of the EXTRAN block of SWMM (3) on sample hypothetical networks are presented. These results indicate a more stable and physically reasonable hydrograph is predicted by the proposed model than that obtained from EXTRAN. Finally, an application of the proposed model to the analysis of an existing drainage network is presented.
Bird, TS 1990, 'Analysis of Mutual Coupling in Finite Arrays of Different-Sized Rectangular Waveguides', IEEE Transactions on Antennas and Propagation, vol. 38, no. 2, pp. 166-172.
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A Green's function approach is used to analyze mutual coupling in a finite array of different-sized rectangular waveguides arranged on a rectangular grid. In calculating the self- and mutual admittances for mode coupling, a quadruple integration over the source and observer apertures is involved. Possible means of reducing the order of integration are discussed, with the change of variables approach (due to Lewin) being selected. This approach is generalized to allow coupling between different-sized apertures, and leads to derivation of mutual admittance expressions for all possible combinations of transverse electric (TE) and transverse magnetic (TM) mode coupling. Calculations using these expressions are shown to be in good agreement with results published earlier by Mailloux and measured data for an antenna comprising a square waveguide and two rectangular waveguides. Coupling between closely spaced different-sized square waveguides is investigated also, and for small apertures minimum coupling is shown to occur when the aperture sidelength is about 1.15 λ. © 1990 IEEE
Bird, TS 1990, 'Behaviour of multiple elliptical waveguides opening into a ground plane', IEE Proceedings H: Microwaves, Antennas and Propagation, vol. 137, no. 2, pp. 121-126.
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Radiation from elliptical waveguides terminating in a ground plane is analysed using a Green's function approach. In the waveguides the field is expressed as a sum of the TEcmn, TMcmn, TEsmn and TMsmn elliptical waveguide modes, and expressions for the mutual admittances of modes excited at the apertures are obtained. From these expressions the mode reflection and conversion coefficients are determined. Of the techniques available for calculating the mutual admittances, the transform representation and direct integration approaches are used, with the latter preferred for detailed calculations. Results obtained for elliptical waveguides are compared with corresponding results for rectangular waveguides in a ground plane. Within limits, the less computationally intense rectangular waveguide solution can be a useful first approximation to the elliptical waveguide solution.
Bird, TS & Hay, SG 1990, 'Mismatch in Dielectric-Loaded Rectangular Waveguide Antenna', Electronics Letters, vol. 26, no. 1, pp. 59-61.
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A method is described for calculating mode reflection and conversion at the aperture of a dielectric-loaded waveguide terminating in a groundplane. Theoretical and measured results are presented for the mismatch in a rectangular waveguide with dielectric placed parallel to the principal electric field. These results demonstrate the importance of high-order modes in estimating mismatch. © 1990, The Institution of Electrical Engineers. All rights reserved.
Bird, TS & Sprey, MA 1990, 'Scan limitations of shaped dual-offset reflector antennas for multiple satellite access', Electronics Letters, vol. 26, no. 4, pp. 228-230.
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The performance of offset Cassegrain antennas, shaped to provide wide scan angles, is outlined for use in earth stations which are capable of accessing several satellites simultaneously. The effect on the beam efficiency of scanning over a rectangular-shaped coverage region located about the geostationary arc is described. Limitations on scan performance are discussed as is the effect of satellite tracking by feed movement. © 1990, The Institution of Electrical Engineers. All rights reserved.
Briers, M & Hirst, M 1990, 'The role of budgetary information in performance evaluation', Accounting, Organizations and Society, vol. 15, no. 4, pp. 373-398.
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This paper provides a review of studies that focus on the use of budgetary information in performance evaluation. Our survey shows that studies have recognized that this information is used in a variety of ways. In addition, various psychological and behavioral effects of alternative uses as well as factors that give rise to a particular use have been identified. Notwithstanding this breadth of analysis, a critical review of the literature shows that in recent years theoretical development has been piece meal, and there are instance of selective referencing and an uncritical acceptance of theory statements in related literature. More generally, theoretical development has taken a secondary role to an emphasis on statistical analysis. Further, recent empirical studies tend to be method-driven in their selection of relevant phenomena and, in addition, include several characteristics that cause an uncoupling of the connection between theory statements and empirical test. The present review interprets these limitations as providing opportunities for future research. © 1990.
Candy, JV, Ziolkowski, RW & Lewis, DK 1990, 'Transient wave estimation: A multichannel deconvolution application', Journal of the Acoustical Society of America, vol. 88, no. 5, pp. 2235-2247.
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The evolution of new concepts in wave theory have led to proof-in-principle experiments aimed at validating the generation of a specified wave front. Not only have these concepts initiated research in transient wave theory, but they have also caused renewed effort in multichannel signal processing. In this paper, the development of a processor to deconvolve a transient acoustic wave from sensor array measurements is discussed. The design of the multichannel deconvolver coupled with model-based signal processing techniques using acoustic pressure field measurements is discussed. Here, it is shown that an efficient solution to this problem can be obtained using a vector form of the Levinson-Wiggins-Robinson (LWR) algorithm. © 1990, Acoustical Society of America. All rights reserved.
Candy, JV, Ziolkowski, RW & Lewis, DK 1990, 'Transient waves: Reconstruction and processing', Journal of the Acoustical Society of America, vol. 88, no. 5, pp. 2248-2258.
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New solutions to the wave equation have been shown to exhibit enhanced localization and energy fluence characteristics. The transmission and reception of these localized waves create unique problems, since they are essentially transient wave fronts in both time and space. Nonetheless, the ability to transmit wave energy through space with these interesting properties has many potential applications in a variety of applications areas. To realize their potential, new methods must be developed to analyze and process these waves. In this paper, approaches to design receiving arrays to reconstruct these special transient waves from noisy measurement data are discussed. © 1990, Acoustical Society of America. All rights reserved.
Chang, J & Vigneswaran, S 1990, 'Ionic strength in deep bed filtration', Water Research, vol. 24, no. 11, pp. 1425-1430.
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The removal efficiency of particles in deep bed filtration depends on both transport and attachment mechanisms of particles. The particle attachment mechanisms depend mainly on chemical characteristics of aqueous phase, suspended particles and filter media. In this study, two different suspensions were used to study the effect of ionic strength on the particle removal efficiency. The ionic strength of suspension was varied by adding a known amount of sodium chloride. The removal efficiencies were related to ionic strength and zeta potential. The clean filter bed efficiency and removal efficiency during the ripening period for various strengths were quantitatively related to the two model coefficients appearing in the O'Melia-Ali model. These model coefficients represent the filter medium-particle and particle-particle attachments. This type of quantification of the effect of ionic strength in terms of filter efficiency is very useful in filter design and operation control.
Colagiuri, S, Caden, MJ, Shannon, AG & Gallagher, P 1990, 'An integrated computerized system for diabetes management', Journal of Clinical Computing, vol. 18, no. 4, pp. 87-91.
Dajani, I, Dipeso, G, Morse, EC & Ziolkowski, R 1990, 'Gaussian beam propagation in a weakly nonlinear medium: A geometrical optics approach', Physical Review A, vol. 41, no. 7, pp. 3740-3745.
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A geometrical optics method for solving wave propagation in weakly nonlinear, weakly inhomogeneous media is presented and applied to the propagation of a two-dimensional Gaussian beam. A complex distorted phase ; is obtained. This complex phase is used to describe both the zeroth-order amplitude and the nonlinear rays along which the energy propagates. This approach recovers standard self-focusing and self-blooming effects in a quadratically nonlinear medium. © 1990 The American Physical Society.
EZE, OC & LOGANATHAN, P 1990, 'EFFECTS OF PH ON PHOSPHATE SORPTION OF SOME PALE-ADULTS OF SOUTHERN NIGERIA', SOIL SCIENCE, vol. 150, no. 3, pp. 613-621.
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Gardner, JF, Srinivasan, K & Waldron, K 1990, 'A Solution For The Force Distribution Problem In Redundantly Actuated Closed Kinematic Chains', Journal Of Dynamic Systems Measurement And Control-transactions Of The ASME, vol. 112, no. 3, pp. 523-526.
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Gowripalan, N, Cabrera, JG, Cusens, AR & Wainwright, PJ 1990, 'Effect of curing on durability', Concrete International, vol. 12, no. 2, pp. 47-54.
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The durability of concrete structures is greatly influenced by the curing of the concrete. Inadequate curing can result in a very weak and porous material near the surface of the concrete that is vulnerable to ingress of various harmful substances from the environment. A review is presented of the effects of methods and duration of curing on concrete properties with respect to permeability, porosity, and water absorption. Results obtained from mortar specimens that were cured using chemical membranes are discussed. A brief discussion on the current method of assessing the curing efficiency of chemical membranes is also presented.
Huang, M & Waldron, K 1990, 'Relationship Between Payload And Speed In Legged Locomotion Systems', IEEE Transactions On Robotics And Automation, vol. 6, no. 5, pp. 570-577.
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Huynh, BP, Coulman, CE & Turner, TR 1990, 'Some turbulence characteristics of convectively mixed layers over rugged and homogeneous terrain', Boundary-Layer Meteorology, vol. 51, no. 3, pp. 229-254.
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Turbulence characteristics of convectively mixed layers over rugged and homogenous terrain are presented, and their differences are sought. The data used in the study were obtained from aircraftborne instruments. Apart from statistics related to the mixing ratio q, there does not seem to be a marked difference between the two sets of data. This lack of difference is attributed to the degree of ruggedness of the terrain and the dominant wind direction. The behaviour of some statistics related to q is attributed to the entrainment effect of the unstable layer of the moist, cool air above the mixed layer. © 1990 Kluwer Academic Publishers.
Jay, CB 1990, 'A note on natural numbers objects in monoidal categories', Studia Logica, vol. 48, pp. 389-93.
Jay, CB 1990, 'Languages for triples, bicategories and braided monoidal categories', Cahiers de Topologie et Géométrie Différentielle Catégoriques, vol. 31, pp. 67-81.
Jay, CB 1990, 'The structure of free closed categories', Journal of Pure and Applied Algebra, vol. 66, pp. 271-285.
Kougias, F & Schulte, J 1990, 'Simulating the immune response to the HIV-1 virus with cellular automata', Journal of Statistical Physics, vol. 60, no. 1/2, pp. 263-273.
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Kumar, V & Waldron, K 1990, 'Force Distribution In Walking Vehicles', Journal Of Mechanical Design, vol. 112, no. 1, pp. 90-99.
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MADSEN, NK & ZIOLKOWSKI, RW 1990, 'A 3-DIMENSIONAL MODIFIED FINITE VOLUME TECHNIQUE FOR MAXWELL EQUATIONS', ELECTROMAGNETICS, vol. 10, no. 1-2, pp. 147-161.
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Mahinthakumar, G & Vigneswaran, S 1990, 'Solute Transport Through Saturated Soils - A Study Of The Physical Nonequilibrium Model', Water Air And Soil Pollution, vol. 51, no. 1-2, pp. 161-180.
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Nanua, P, Waldron, K & Murthy, V 1990, 'Direct Kinematic Solution Of A Stewart Platform', IEEE Transactions On Robotics And Automation, vol. 6, no. 4, pp. 438-444.
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Reuben, AJ & Shannon, AG 1990, 'Some problems in the mathematical modelling of erythrocyte sedimentation', Mathematical Medicine and Biology, vol. 7, no. 3, pp. 145-156.
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The rate at which red blood cells fall in vitro is used as a common clinical test, amongst others, for a number of pathological conditions. The use of this test is cast into doubt when one finds flaws in the underlying models and confusion over fundamental issues such as the aggregation of the red blood cells. Both of these deficiencies are evident in an otherwise innovative publication by Huang et al. (1971). In examining the mathematics of this relatively unknown study, it is found that the Huang model resembles certain moving-boundary problems. The consequences of this observation are discussed. © 1990 Oxford University Press.
REUBEN, AJ & SHANNON, AG 1990, 'SOME PROBLEMS IN THE MATHEMATICAL-MODELING OF ERYTHROCYTE SEDIMENTATION', IMA JOURNAL OF MATHEMATICS APPLIED IN MEDICINE AND BIOLOGY, vol. 7, no. 3, pp. 145-156.
SHAARAWI, AM, BESIERIS, IM & ZIOLKOWSKI, RW 1990, 'A NOVEL-APPROACH TO THE SYNTHESIS OF NONDISPERSIVE WAVE PACKET SOLUTIONS TO THE KLEIN-GORDON AND DIRAC EQUATIONS', JOURNAL OF MATHEMATICAL PHYSICS, vol. 31, no. 10, pp. 2511-2519.
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SHANNON, AG, COLAGIURI, S & MILLER, JJ 1990, 'COMPARISON OF GLYCEMIC CONTROL WITH HUMAN AND PORCINE INSULINS - A META-ANALYSIS', MEDICAL JOURNAL OF AUSTRALIA, vol. 152, no. 1, pp. 49-49.
Veitch, D & Glendinning, P 1990, 'Explicit renormalisation in piecewise linear bimodal maps', Physica D: Nonlinear Phenomena, vol. 44, pp. 149-167.
Veitch, D, Asten, MW & Van Leeuwen, EH 1990, 'Electrical and magnetometric fields in a layered earth containing buried electrodes', Geophysics, vol. 55, pp. 1605-1612.
Vigneswaran, S & Joshi, D 1990, 'Laboratory development of a small-scale iron removal plant for rural water supply', Aqua, vol. 39, no. 5, pp. 300-308.
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This paper outlines the construction and performance of a simple iron and manganese removal plant, suitable for small community water supply in rural areas, where groundwater is extensively used for drinking and other domestic purposes. The unit consists of a contact filter to oxidize iron and manganese and a matrix filter to remove these pollutants. This paper presents a design approach for a new type of fixed-bed filter, known as matrix filter, for the removal of suspended solids, iron, manganese and coliform. -Authors
Vigneswaran, S, Jing Song Chang & Janssens, JG 1990, 'Experimental investigation of size distribution of suspended particles in granular bed filtration', Water Research, vol. 24, no. 7, pp. 927-930.
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Laboratory-scale experimental studies were conducted to show the effect of size distribution of particles in granular bed filtration. The results showed that the investigation of granular bed filtration based merely on the mean size is inadequate as particles of different size have different removal efficiencies. This study also showed that there is an improvement in fine particles removal efficiency when they are present with particles in polydispersed suspension. © 1990.
Voinov, AA & Akhremenkov, AA 1990, 'Simulation modeling system for aquatic bodies', Ecological Modelling, vol. 52, no. C, pp. 181-205.
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Basic principles and advantages of a user-friendly interactive modeling system (SIMSAB) are discussed. The system is designed as a personal-computer interface. The model is formulated in terms of a special flow-language, which is then automatically translated to produce portable Fortran programs that can be run on any computer. Additional blocks and processes can be put into the system by a user who knows Fortran. The system is intended for construction of compartmental models and includes a special hydrodynamic block to calculate wind-induced currents and to account for the material exchange between compartments. © 1990.
Watterson, PA 1990, 'Magnetic-field Penetration Into Thin Disks', Archiv Fur Elektrotechnik, vol. 73, no. 5, pp. 353-363.
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Ying, M 1990, 'On Probabilistic Normed Spaces Under τT,L', International Journal of Mathematics and Mathematical Sciences, vol. 13, no. 4, pp. 731-736.
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We introduce the operation [formula omitted] copulative with τT,Lto define PN space under τT,Land establish some basic properties of probabilistic seminorms and norms under τT,L. Finally, we discuss so-called L-simple spaces. © 1990, Hindawi Publishing Corporation. All rights reserved.
Ying, M 1990, 'The Alternativity Measures Of Fuzzy-Sets', Fuzzy Sets and Systems, vol. 37, no. 1, pp. 105-110.
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ZHANG, N & HAYAMA, S 1990, 'IDENTIFICATION OF STRUCTURAL SYSTEM PARAMETERS FROM TIME DOMAIN DATA - (IDENTIFICATION OF GLOBAL MODAL PARAMETERS OF A STRUCTURAL SYSTEM BY THE IMPROVED STATE VARIABLE METHOD)', JSME INTERNATIONAL JOURNAL SERIES III-VIBRATION CONTROL ENGINEERING ENGINEERING FOR INDUSTRY, vol. 33, no. 2, pp. 168-175.
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Zhou, JL & Banks, CJ 1990, 'Fractionation of humic acid components by ion exchange chromatography', Environmental Technology (United Kingdom), vol. 11, no. 12, pp. 1147-1152.
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Three kinds of resin adsorbents have been used to separate humic acid from water and inorganic salts and to fractionate these solutes into six compound classes. The multistep process consists of adsorption chromatography followed by cation and anion exchange chromatography, rotary vacuum evaporation, desalting and crystallisation. It recovered 96% of the total mass of humic acid from 2 litres of 400mg−1humic acid solution. © 1990 Taylor and Francis Group, LLC.
Ziolkowski, RW & Lewis, DK 1990, 'Verification of the localized-wave transmission effect', Journal of Applied Physics, vol. 68, no. 12, pp. 6083-6086.
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An acoustic array driven with a designed set of localized-wave (LW) solutions of the scalar-wave equation generates a robust, well-behaved, transient pencil beam of ultrasound in water. The performance of the LW-pulse-driven array theoretically and experimentally exceeds a tenfold improvement over related continuous-wave excitations of the same array.
Hong, G & Collings, N 1990, 'Application of self-tuning control', SAE Technical Papers.
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Two kinds of self-tuning control algorithms have been applied using a novel smoke sensor as part of a diesel smoke control system. Firstly, pole assignment self-tuning control was used to achieve the desired engine speed response, with a smoke predictor used to solve the problems caused by the time delay between the fuel input and smoke output; secondly, a Pl self-tuning controller was used to solve the problem caused by the variation of the coefficients in the transfer functions with engine conditions. The experimental results and the problems and the ideas for future work are discussed. Copyright © 1990 Society of Automotive Engineers, Inc.
Huang, XJ & Chen, HB 1990, 'Born migration and its fast implementation in the wavenumber-time domain', 1990 SEG Annual Meeting, pp. 1136-1139.
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© 1990 Society of Exploration Geophysicists. All rights reserved. A new method for wave equation migration is presented in this paper. This migration method, named Born Migration, is formulated by solving the boundary-value problem of the wave equation in an integral closed-form and applying the Born approximation for the Green's function in the inhomogeneous media. The major features of Born migration are: 1. it has no limitation in dip angle; 2. it can accommodate gentle vertical and lateral velocity variations; and 3. it can be implemented by using fast Fourier transformation. It is believed that this technique is especially suitable for migration in 3D seismic survey application.
Lister, R 1990, 'Toward context dependent classification of infra-red spectra by energy minimization', IJCNN. International Joint Conference on Neural Networks, pp. 1-6.
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An architecture for reimplementing an existing expert system is described. The original application, called GOLD, identifies minerals in rock samples, using infrared spectral data, and was developed in the Prospector formalism. The development of GOLD's knowledge base became cumbersome when it was necessary to describe how the spectrum of one mineral is affected by the presence of another mineral in the same sample. This is due to Prospector's one-way flow of information in the inference net, from data to goals. Any form of unidirectional knowledge representation would suffer the same problem. A bidirectional energy minimization network is a more suitable form of knowledge representation. This is illustrated on a simplified version of the spectral interpretation problem.
MCLAUGHLAN, RG & STUETZ, RM 1990, 'TUBEWELL FOULING AT A SALINITY INTERCEPTION SCHEME, WAKOOL, NSW, AUSTRALIA', WATER WELLS, pp. 47-58.
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Poulton, GT, Bird, TS, Hay, SG & Choi, YK 1990, 'Rigorous design of an antenna for AUSSAT-B', IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), pp. 1900-1903.
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The prototype antenna designed, constructed, and tested for the AUSSAT-B western Australia regional beam has operated within specifications in all regards. More importantly, the overall design approach of using highly accurate software tools to obtain a successful first-time design has been vindicated. The antenna, comprising an array of horns illuminating an offset paraboloidal reflector, has a beamforming network (BFN) to provide correct power distribution and phasing to the feed elements. The antenna geometry is defined, showing the specified racetrack projected aperture. The other main constraint imposed on the antenna design was a volumetric limit on the feed and beamforming network. The far-field pattern obtained at 12.5 GHz is shown, with the beam pattern computed from measured BFN excitations superimposed. It is shown that the correspondence between theory and experiment is excellent.
Seeman, P, Niznik, HB, Nguyen, T, Tirpak, A, Jarvie, KR, Israel, Y & O'Dowd, BF 1990, 'Neuroleptic/dopamine receptors: search for new g-linked receptors', European Journal of Pharmacology, pp. 106-107.
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WAINWRIGHT, PJ, CABRERA, JG & GOWRIPALAN, N 1990, 'ASSESSMENT OF THE EFFICIENCY OF CHEMICAL MEMBRANES TO CURE CONCRETE', PROTECTION OF CONCRETE, INTERNATIONAL CONF ON PROTECTION OF CONCRETE, E & FN SPON, UNIV DUNDEE, DUNDEE, SCOTLAND, pp. 907-920.