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 WAVE-GUIDES', IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, vol. 38, no. 2, pp. 166-172.
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BIRD, TS 1990, 'BEHAVIOR OF MULTIPLE ELLIPTIC WAVE-GUIDES OPENING INTO A GROUND PLANE', IEE PROCEEDINGS-H MICROWAVES ANTENNAS AND PROPAGATION, vol. 137, no. 2, pp. 121-126.
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BIRD, TS & HAY, SG 1990, 'MISMATCH IN DIELECTRIC-LOADED RECTANGULAR WAVE-GUIDE ANTENNA', ELECTRONICS LETTERS, vol. 26, no. 1, pp. 59-61.
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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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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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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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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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DOSORETZ, CG, CHEN, AHC & GRETHLEIN, HE 1990, 'EFFECT OF OXYGENATION CONDITIONS ON SUBMERGED CULTURES OF PHANEROCHAETE-CHRYSOSPORIUM', APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, vol. 34, no. 1, pp. 131-137.
DOSORETZ, CG, CHEN, HC & GRETHLEIN, HE 1990, 'EFFECT OF ENVIRONMENTAL-CONDITIONS ON EXTRACELLULAR PROTEASE ACTIVITY IN LIGNOLYTIC CULTURES OF PHANEROCHAETE-CHRYSOSPORIUM', APPLIED AND ENVIRONMENTAL MICROBIOLOGY, vol. 56, no. 2, pp. 395-400.
DOSORETZ, CG, DASS, SB, REDDY, CA & GRETHLEIN, HE 1990, 'PROTEASE-MEDIATED DEGRADATION OF LIGNIN PEROXIDASE IN LIQUID CULTURES OF PHANEROCHAETE-CHRYSOSPORIUM', APPLIED AND ENVIRONMENTAL MICROBIOLOGY, vol. 56, no. 11, pp. 3429-3434.
Eze, OC & Loganathan, P 1990, 'Effects of pH on phosphate sorption of some paleudults of Southern Nigeria', Soil Science, vol. 150, no. 3, pp. 613-621.
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The effect of pH on phosphate sorption by soil samples from two coarse-textured pedons of typic Paleudults in the perhumid tropical zone of Nigeria was studied by equilibrating air-dried soil samples adjusted to pH 3.5–6.5 for 48 h with 10 ppm P and 60 ppm P solutions at two concentrations of CaCl2 and NaCl. Phosphate sorption was generally unaffected by pH at low P additions at the two concentrations of the salts, whereas at high P additions sorption generally decreased with increase in soil pH, except in the presence of the high concentration of CaCl2 (10−2 M) where sorption decreased up to pH 5.0–5.5; beyond this pH range it increased. In both 10−2 M CaCl2 and 3 × 10−2 M NaCl systems, phosphate sorption decreased by 19–89% as a result of dithionite-citrate-bicarbonate (DCB) treatment. The effects of pH on phosphate sorption by treated samples were similar to those by untreated samples. Phosphate sorption increased with increase in depth, probably due to the increase in oxalate and dithionite-citrate-bi-carbonate extractable Fe and Al and the decrease in organic matter content down the pedons. Phosphate sorption by samples from the B horizon increased with increase in period of incubation with lime, whereas in the samples of Ap horizons no consistent trend was obtained. © 1990 Williams and Wilkins.
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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Gardner, JF, Srinivasan, K & Waldron, K 1990, 'Closed-loop Trajectory Control Of Walking Machines', Robotica, vol. 8, pp. 13-22.
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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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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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Pugh, D, Ribble, E, Vohnout, V, Bihari, T, Walliser, T, Patterson, M & Waldron, K 1990, 'Technical Description Of The Adaptive Suspension Vehicle', International Journal Of Robotics Research, vol. 9, no. 2, pp. 24-42.
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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.
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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. 3-4, pp. 181-205.
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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,L to define PN space under τT,L and 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, vol. 11, no. 12, pp. 1147-1152.
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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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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.
Horwitz, R, Courtenay, TD & Braun, RM 1990, 'The development of novel modem structures to enhance the throughput of dial up telephone lines', IEEE 1990 South African Symposium on Communications and Signal Processing, COMSIG 1990 - Proceedings, pp. 95-99.
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© 1990 IEEE. A popular approach to designing high-speed modems for use on voice-grade telephone channels is to use a high order modulation scheme combined with a digital architecture. This paper describes the development of a modem structure which uses the DSP56001 signal processor to implement 49 quadrature partial response signalling (49 QPRS). The choice of 49 QPRS is justified by its high spectral efficiency and reasonable error rate performance. This system is being developed for two applications, which are described in the paper.
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, INTERNATIONAL CONF ON GROUNDWATER ENGINEERING, E & FN SPON, CRANFIELD INST TECHNOL, CRANFIELD, ENGLAND, pp. 47-58.
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Murthy, V & Waldron, KJ 1990, 'Parallel dual of the Stanford arm', American Society of Mechanical Engineers, Design Engineering Division (Publication) DE, pp. 141-145.
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The Stanford arm is a robot of well known geometry which is characterized by having eight solutions to the inverse position kinematics problem. Its dual, under the velocity motor/wrench symmetry, is here shown to also have eight solutions to its direct position kinematics problem. Under the duality, the direct kinematics problem of a parallel mechanism corresponds to the inverse kinematics problem of a serial mechanism. Although there is no general proof that the number of solutions in the position kinematics problems of such dual pairs is the same, the example presented here, together with solutions to the corresponding problems of several other dual pairs some which were presented earlier forms a context within which the general relationship at the position level between pairs of mechanisms which are dual to each other can be addressed. The Stanford arm and its parallel dual forms the first such pair containing a prismatic joint in the serial chain to be studied.
Murthy, V & Waldron, KJ 1990, 'Position kinematics of the generalized lobster arm and its series-parallel dual', American Society of Mechanical Engineers, Design Engineering Division (Publication) DE, pp. 253-261.
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The generalized lobster arm is a six revolute open kinematic chain with 3 consecutive intersecting pairs of axes. A new solution of the inverse position kinematics problem of this arm which takes advantage of its specific geometry is presented. A comparison is made with the direct position kinematics problem of the series-parallel dual mechanism. The equations governing the two problems show strong similarity and can each be reduced to a sixteenth degree univariate polynomial equation. The dual series-parallel mechanism is the one that exhibits, with the Lobster arm, the symmetry that exists between the wrench and the velocity motor. Although the results presented here have intrinsic interest, a more generally important feature is the relationship between the solutions to the inverse kinematics of the serial mechanism and the direct kinematics of the parallel mechanism. Although the series-parallel duality has not been shown to hold in the position domain, except in terms of very general characteristics, it is shown here that the two solutions are of the same degree and have other features in common.
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.
Waldron, KJ 1990, 'Solution rectification in three position motion generation synthesis', American Society of Mechanical Engineers, Design Engineering Division (Publication) DE, pp. 301-306.
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In this paper the theory of solution rectification in motion generation synthesis of four-bar linkages is strengthened by presenting the mapping of the three-circle diagram into the center-point plane. This mapping may be used in conjunction with the corresponding mapping of the Filemon construction to eliminate solutions which must change branch to move through all of the design positions when cranks are generated by selecting their center-points. Earlier versions of the theory required that cranks be generated by selection of their circle-points.
Zhou, W & Molinari, B 1990, 'A model of execution time estimating for RPC-oriented programs', Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), pp. 376-384.
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© Springer-Verlag Berlin Heidelberg 1990. This paper describes an execution time estimating model for programs which use Remote Procedure Calls (RPCs) as the tool for distributed computing. At first a general model with no closed-form solution is developed and a nondeterministic algorithm for its solution is given. Then the closed-form solution for a special case of the general model is derived. After using some approximate methods, the lower and upper bounds of the general form solution are described. The last section of this paper presents two examples of the application of the model.