Barsamian, ST & Thornton, BS 1985, 'Dielectric structure of cells indicated from dc polarization methods', Physics Letters A, vol. 107, no. 8, pp. 414-418.
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Electric polarization measurements on calf thymus cells show the existence of recently predicted dielectric zones which develop progressively within whole living cells when transforming from normal to tumourous. © 1985.
Barsamian, ST, Reid, BL & Thornton, BS 1985, 'Origin of dielectric discreteness during the development of Dacus tryoni and its reversal by a carcinogen', IRCS Medical Science, vol. 13, no. 11, pp. 1103-1104.
Bird, TS 1985, 'Accurate Asymptotic Solution for the Surface Field Due to Apertures in a Conducting Cylinder', IEEE Transactions on Antennas and Propagation, vol. 33, no. 10, pp. 1108-1117.
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Asymptotic solutions for the surface field due to a magnetic point source on a cylinder can simplify the computational task in the analysis of mutual coupling-e.g. in conformal arrays. Although several asymptotic solutions are at present available, their accuracy is limited. The aim here is to obtain a new approximate solution with improved accuracy. An asymptotic solution of the exact modal solution for the field on a cylinder which contains terms up to (k0t)-2, where t is the distance from the source, is derived. Approximate terms up to (k0t) -3 are included from the solution for a source on a plane conductor and an earlier asymptotic solution. The new approximate solution consists of the exact solution for a plane conductor, modulated by a Fock function, plus a contribution associated with the cylinder which vanishes in the limit of infinite radius. Typically for cylinders of radius greater than one and half wavelengths it agrees to within O.5 dB in magnitude and 1 ° in phase of the modal solution. Results for dominant mode mutual and self-admittances of rectangular apertures on a cylinder obtained from this solution are presented. A formula is also given for calculating self-admittances from an asymptotic solution. There is excellent agreement between admittances computed from the asymptotic solution and the modal solution. One exception is the self-susceptance of an axial slot where the error is larger than expected, although the error is low enough to be acceptable in most practical cases. Copyright © 1985 by The Institute of Electrical and Electronics Engineers, Inc.
Braun, RM & Downing, B 1985, 'Injection-lock Bandwidth Extension By Control Modulation And Current Hump Slope Detection', Electronics Letters, vol. 21, no. 13, pp. 564-566.
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Burdon, S 1985, 'OPTIMIZING STEEL SALES IN THE AUSTRALIAN CONSUMER GOODS MARKET.', SEAISI Quarterly (South East Asia Iron and Steel Institute), vol. 14, no. 2, pp. 59-64.
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During the last few years the Australian white goods industry has been involved in a major restructuring and rationalisation program which has resulted in fewer, more efficient manufacturers gaining an opportunity to achieve the cost of scale benefits associated with such a move. Manufacturers who survived this shake-out quickly recognised the need to innovate and produce more cost effective products to stimulate and meet market demand while at the same time fend off local and import competition. As a result there has been significant investment in capital equipment to increase productivity and reduce costs. Meanwhile, smart suppliers recognised the part they could play by developing more cost effective products and providing resource input into customer development projects with assistance in areas such as product design, fabrication techniques and material specification. In this paper it is explained how Lysaght recognized the challenge and approached the new opportunities which have evolved within this market.
Moses, RG, Colagiuri, S & Shannon, AG 1985, 'Effectiveness of mass screening for diabetes mellitus using random capillary blood glucose measurements', Medical Journal of Australia, vol. 143, no. 12-13, pp. 544-546.
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The results of 23,228 fingerprick capillary blood glucose tests (the taking of which was coordinates by the Diabetic Association of New South Wales) were reviewed. All non-diabetic persons (n = 860) with a blood glucose result of greater than or equal to 8.0 mmol/L were surveyed and 459 responded (53.4%). The responders were typical of the surveyed group with respect to age and capillary blood glucose level. Sixty-four new cases of diabetes were detected, representing 15.8% of the replies from persons who were not known to have diabetes and 0.28% of the total number of persons screened.
Sedlacek, G, Lopetegui, J, Stutzki, C & Saleh, A 1985, 'Computer Aided Analysis of Space Frames Subjected to Nonlinear Loads.', Bauingenieur Berlin, vol. 60, no. 8, pp. 297-306.
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Two approaches in design of space frame structures are outlined and discussed. The kinematic equations for arbitrary large rotation of beams are formulated by means of rotation vectors. This is the so called displacement method. The other approach uses nonlinear computational algorithms. An iteration procedure was developed using initial stiffness matrix and orthogonal load-deformation-states.
Song, S, Waldron, K & Kinzel, GL 1985, 'Computer-aided Geometric Design Of Legs For A Walking Vehicle', Mechanism And Machine Theory, vol. 20, no. 6, pp. 587-596.
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Vigneswaran, S & Aim, RB 1985, 'The influence of suspended particle size distribution in deep‐bed filtration', AIChE Journal, vol. 31, no. 2, pp. 321-324.
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Vigneswaran, S & Visvanathan, C 1985, 'Mathematical modelling of mobile bed filtration with contact flocculation - filtration arrangement', Effluent & Water Treatment Journal, vol. 25, no. 9, pp. 309-314.
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Mathematical formulation of suspended solids removal in contact-flocculation filtration is complex since both flocculation and suspended solids removal occur within the filter bed itself. In this study, a mathematical formulation based on O'Melia and Alis' model was developed for contact flocculation-filtration incorporating the flocculation phenomena in ideal conditions. This model was then extended to mobile bed filtration with contact flocculation-filtration arrangement and verified with laboratory-scale mobile bed filter experimental results obtained.
Vigneswaran, S, Thiyagaram, M & Aim, RB 1985, 'Mathematical modeling of radial flow filtration and its application to groundwater recharge problems', AIChE Journal, vol. 31, no. 11, pp. 1929-1933.
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Webb, SJ & Thornton, BS 1985, 'Dielectric structure and spatial-temporal organisation in cells', Physica Scripta, vol. 32, no. 3, pp. 253-256.
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A cellular timing mechanism is proposed based on the spiralling motion of membranous blocks of molecules as they pass sequentially through dielectric zones within a cell. The zones can change with altered membrane surface conditions causing altered sequences and timing in metabolic processing and can relate to oncogenesis. © 1985 IOP Publishing Ltd.
Ziolkowski, RW 1985, 'Exact solutions of the wave equation with complex source locations', Journal of Mathematical Physics, vol. 26, no. 4, pp. 861-863.
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New exact solutions of the homogeneous, free-space wave equation are obtained. They originate from complex source points moving at a constant rate parallel to the real axis of propagation and, therefore, they maintain a Gaussian profile as they propagate. Finite energy pulses can be constructed from these Gaussian pulses by superposition. © 1985 American Institute of Physics.
ZIOLKOWSKI, RW 1985, 'N-SERIES PROBLEMS AND THE COUPLING OF ELECTROMAGNETIC-WAVES TO APERTURES - A RIEMANN-HILBERT APPROACH', SIAM JOURNAL ON MATHEMATICAL ANALYSIS, vol. 16, no. 2, pp. 358-378.
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Bakoss, SL, Burfitt, A, Cridland, L & Heiman, JL 1985, 'MEASURED AND PREDICTED LONG-TERM DEFORMATIONS IN A TALL CONCRETE BUILDING.', Publication SP - American Concrete Institute, pp. 63-94.
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A 120m tall building incorporating both in-situ and precast post-tensioned concrete components was instrumented to observe some aspects of its structural behaviour. The instrumentation includes embedded and surface strain and temperature transducers, survey reference points, wind pressure tappings, and anemometers above the roof of the building to measure wind characteristics. The paper describes the strain and deformation instrumentation and method of data acquisition. The measured long-term vertical strains and deformations in one of the columns are presented and are compared with values predicted by two methods which are suitable for use by designers. Reference is made to the results of an extensive materials testing programme the results of which enabled the assessment of methods of prediction for the long-term creep and shrinkage properties of the concrete.
Ball, JE 1985, 'ROUTING OF UNSTEADY FLOWS IN URBAN DRAINAGE NETWORKS.', National Conference Publication - Institution of Engineers, Australia, pp. 146-150.
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Flow in an urban drainage network is generally unsteady. Analysis of such flows therefore requires the solution of the unsteady flow (Saint Venant) equations. Among the numerical techniques which have been developed for the analysis of unsteady flows is the four-point implicit finite difference scheme commonly referred to as the Amein scheme. Use of the Amein scheme requires the solution of C multiplied by DELTA v equals minus R where C is a large sparse matrix and DELTA v and R are n multiplied by 1 column vectors. The algorithm proposed herein uses the properties of the drainage network to develop an efficient solution of C multiplied by DELTA v equals minus R based upon the partitioning and decomposition of the coefficient matrix C. An example urban drainage network is analysed showing the use of the proposed solution algorithm.
Bird, TS 1985, 'MUTUAL COUPLING IN WAVEGUIDE-FED PARALLEL PLATE LENSES.', IREECON International (Convention Digest) (Institution of Radio and Electronics Engineers Australi, pp. 936-939.
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An element-by-element analysis of mutual coupling in waveguide-fed parallel plate lenses is described which uses solutions for the surface field excited by a magnetic dipole on a concave cylindrical conductor. Coupling coefficients computed by this method are compared with measured results for a circular and a Rotman lens.
Bird, TS & Poulton, GT 1985, 'ENVELOPE-CONSTRAINED PATTERN SYNTHESIS FOR SATELLITE ANTENNAS.', IREECON International (Convention Digest) (Institution of Radio and Electronics Engineers Australi, pp. 567-570.
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Two techniques are compared for contoured beam design for on-board satellite antennas with constraints on both co-polar and cross-polar pattern envelopes. The techniques are based respectively on a penalty function approach and the method of successive projections and are applied to an array-fed single-offset reflector antenna producing a beam covering the south-east region of Australia.
Burdon, S 1985, 'OPTIMISING STEEL SALES IN THE AUSTRALIAN CONSUMER GOODS MARKET.'.
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During the last few years the Australian white goods industry has been involved in a major restructuring and rationalisation programme which has resulted in fewer, more efficient manufacturers. Manufacturers who have survived have recognised the need to innovate and produce more cost effective products to stimulate market demand and resist local and import competition. As a result there has been significant investment in capital equipment to increase productivity and reduce costs. This paper explains how Lysaght recognised the challenge and approached the new opportunities which have evolved within this market.
Hoang, DB 1985, 'FLOW CONTROL FOR INTEGRATED VOICE-DATA SERVICES IN LOCAL AREA NETWORKS.', National Conference Publication - Institution of Engineers, Australia, pp. 90-94.
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The paper proposes some flow control strategies for integrated voice-data services in local area networks. The strategies involve determining a threshold level, which depends on both voice and data statistics, and taking into account information on the service available in the past. The flow control algorithms proposed are simple and flexible that they can be implemented on a microprocessor-based network interface unit and that they can be applied in other integrated-service systems.
Hoang, DB 1985, 'PACKET SWITCHED EXCHANGE MODELLING AND PERFORMANCE ANALYSIS.', IREECON International (Convention Digest) (Institution of Radio and Electronics Engineers Australi, pp. 779-782.
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A general method for evaluating the performance of a computer network is developed based on queueing models for packet switched exchange (PSE) and for subcommunication networks. The packet switched exchange is modelled by an open network of queues with constraints in such a way that it resembles practical implementation and operation of the switching node. The subcommunication model, which has been developed is incorporated to form a general method for performance analysis of the whole network.
Hoang, DB 1985, 'PACKET SWITCHED NODE MODELLING AND PERFORMANCE ANALYSIS.', pp. 881-886.
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A general method for evaluating the performance of a computer network is developed based on queuing models for the packet-switched nodes and for the subcommunication network. The packet-switched node is modeled by an open network of queues with constraints in such a way that it resembles practical implementation and operation of the switching node. The subcommunication model is then incorporated to provide a general method for performance analysis of the whole network. The model is flexible in that the structure of each node might be different, and the queuing model can easily be tailored according to the actual implementation.
Pery, A, Gardner, JF & Waldron, KJ 1985, 'DESIGN AND TESTING OF A HIGH PERFORMANCE HYDRAULIC POWER SYSTEM FOR A LEGGED LOCOMOTION APPLICATION.', Proceedings of the American Control Conference, pp. 730-736.
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The requirements imposed on the actuation system of an energy-autonomous, six-legged walking vehicle are unique and rigorous. The analysis, design, and testing of such an actuation system for the adaptive suspension vehicle (ASV) at Ohio State University is presented. Special attention is given to the synthesis of the general system configuration, which is a pump-controlled hydraulic system. The selection, design an testing of individual components and systems are discussed. The system developed and designed for the ASV has reasonably large bandwidth, compatible with equivalent familiar valve control systems. This system, although designed for a rather unique application, may eventually find its way into more conventional applications, such as in the heavy-duty robotics field.
Pham, DT & Dissanayake, G 1985, 'FEASIBILITY STUDY OF A VIBRATORY SENSOR FOR LOCATING 3-D OBJECTS.', Proceedings of the International Machine Tool Design and Research Conference, pp. 201-211.
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A novel sensor is investigated which is intended to be mounted at the wrist of a robot to enable it to determine the co-ordinates of a part it has picked up from a stack or tray. The device operates by letting the part vibrate about two orthogonal axes and measuring its inertia-dependent instantaneous velocities and angles of vibration. The mathematical procedures for extracting position and orientation data from these measurements are described. The results of computer simulations carried out to determine guidelines for the design of the device are presented and discussed.
Pham, DT & Dissanayake, MWMG 1985, 'INERTIA-BASED SENSORS WITH ONE AND TWO DEGREES OF FREEDOM FOR LOCATING PARTS.', pp. 223-237.
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Two inertia-based sensors for determining the position and orientation of three-dimensional objects are described. One of them involves letting the objects vibrate about two orthogonal axes simultaneously and measuring the angles and velocities of vibration at various instants of time. In the other sensor, the objects are also vibrated about two axes but the vibrations are performed sequentially and the frequencies of vibration are measured. The mathematical procedures for obtaining the position and orientation of the objects from the measurements are outlined for the second sensor. Results of the computer simulations carried out to assess the feasibility of the latter are presented.
Pham, DT & Dissanayake, MWMG 1985, 'THREE-DEGREE-OF-FREEDOM INERTIAL SENSOR FOR LOCATING PARTS.', pp. 613-629.
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A compromise solution to the problem of economically feeding parts to industrial robots is investigated. The parts are neither accurately presented as in the case of traditional feeding equipment nor jumbled up as in the case of bin-picking machines. Instead, they are semi-ordered into stacks or trays and then unloaded by the robots as needed. The robots are to be equipped with a novel sensor fitted to their wrists for determining the exact coordinates of the parts they have picked up. The device operates by letting the parts vibrate about three orthogonal axes and measuring their inertia-dependent natural frequencies of vibration. The mathematical procedures for extracting position and orientation data from those measurements are described. The results of computer simulations carried out to determine guidelines for the design of the device are presented and discussed.
Song, SM, Lee, JK & Waldron, KJ 1985, 'MOTION STUDY OF TWO AND THREE DIMENSIONAL PANTOGRAPH MECHANISMS.', Proceedings - OSU Applied Mechanisms Conference (Oklahoma State University).
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Coupling of vertical, horizontal and rotory motions in manipulators slows down calculating speed for real time control and lowers system energy efficiency. Pantograph mechanisms are being used as manipulators to remove the coupling of motion. Methods which are used to determine the workspace of pantograph type manipulators are illustrated in an example. Some aspects of structural design are also discussed.
Song, SM, Lu, FH & Waldron, KJ 1985, 'NUMERICAL METHOD IN DETERMINATION OF THE SHORTEST CRANK IN FOUR POSITION BURMESTER SYNTHESIS.', Proceedings - OSU Applied Mechanisms Conference (Oklahoma State University).
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A numerical implementation based on the Newton-Raphson method of solving seven nonlinear equations is presented. A set of eight simultaneous and nonlinear equations is able to eliminate the spurious solutions which give incorrect geometry, and the spurious solutions which have wrong signs of angles are detected by the computer after convergence. The accurate length and position of the shortest crank can then be determined by a few trials.
Waldron, KJ 1985, 'MECHANICS OF MOBILE ROBOTS.', pp. 533-544.
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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.
Waldron, KJ, Brown, TF, Vohnout, V, Kinzel, G & Srinivasan, K 1985, 'TWO EXPERIMENTS ON LEGGED LOCOMOTION.', Proceedings - OSU Applied Mechanisms Conference (Oklahoma State University).
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This paper contains a discussion of the OSU Monopod and the DUWE (Dynamic Unpowered Walking Experiment). These devices were constructed to experimentally verify ideas relating to legged locomotion with low specific resistance. These ideas were incorporated into the design of the Adaptive Suspension Vehicle. The DUWE was also used to explore the mechanics of ballistic leg return and the energetic interactions of the legs and body of a multi-legged machine.
Waldron, KJ, Song, SM, Wang, SL & Vohnout, J 1985, 'MECHANICAL AND GEOMETRIC DESIGN OF THE ADAPTIVE SUSPENSION VEHICLE.', pp. 295-306.
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Some aspects of the mechanical and geometric design of the adaptive suspension vehicle are presented. In particular, there is an emphasis on aspects of the leg design and vehicle geometry, which affect the ability of the vehicle to operate on steep grades or to cross obstacles. A mechanism that maintains the attitude of the foot approximately parallel to the body is described. Geometric aspects of maintaining static stability on steep grades are discussed. Geometric and gait sequence aspects of crossing severe obstacles are also discussed.