Bird, TS 1979, 'MODE COUPLING IN A PLANAR CIRCULAR WAVEGUIDE ARRAY.', IEE journal on microwaves, optics and acoustics, vol. 3, no. 5, pp. 172-180.
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By means of an integral-equation approach, expressions are derived for all mode coupling occurring in a finite, planar circuit waveguide array. Modes coupling in the aperture of each waveguide yield terms dependent upon contour integrals. These are placed in a suitable form for numerical integration. A new asymptotic formula is obtained for the coupling between modes in separate waveguides. Theoretical results are presented for the TE//1//1 mode admittance of flanged circular waveguide and for two wavegides coupling in the H-plane. These results are shown to correlate satisfactorily with previously published experimental data.
Bird, TS 1979, 'OPTIMUM ARRAY FEED FOR A MULTIPLE-BEAM REFLECTOR ANTENNA.', IREECON International (Convention Digest) (Institution of Radio and Electronics Engineers Australia), pp. 44-46.
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A method is described whereby the excitation of an array feed for a reflector antenna is synthesized so as to achieve high aperture efficiencies and low cross-polarization throughout a desired coverage region. Results are presented for a dual-offset reflector antenna having a circular waveguide array feed. 5 refs.
Heiman, JL, Bakoss, SL, Burfitt, AJ & Cridland, L 1979, 'MEASURED AND PREDICTED AXIAL STRAINS AND DEFORMATIONS IN A COLUMN OF A TALL REINFORCED CONCRETE BUILDING.', National Conference Publication - Institution of Engineers, Australia, no. 79 /9, pp. 44-51.
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A site investigation was carried out to determine the axial deformations of a column in a tall reinforced concrete building. Strains were measured in the column concrete using vibrating wire gauges and the column deformations were measured by precise levelling. In addition to strain measurements on standard laboratory shrinkage and creep specimens, strain data was obtained from tests that related more closely to the site conditions. Appreciable differences occurred between shrinkage and creep strains measured in the laboratory and some of those obtained by methods given in codes. Shortcomings were found in some of the equations used to predict long-term creep strains from laboratory data and a hyperbolic equation was developed that enabled more accurate predictions to be made. Measured strains in the column were compared with predicted values obtained by two calculation methods and good agreement was obtained.
Shannon, AG 1979, 'Mathematical attitudes and semantic differentials', International Journal of Mathematical Education in Science and Technology, vol. 10, no. 4, pp. 497-507.
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The semantic differential-one approach to attitude measurement- basically records a combination of a person's associations with a particular concept with a scaling procedure. This paper considers the implications of such a device for teachers of mathematics. © Taylor & Francis Group, LLC.
Shannon, AG & Clark, BE 1979, 'Mathematical Attitudes of Some Polytechnic Students', British Journal of Educational Technology, vol. 10, no. 1, pp. 59-68.
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This is an investigation in which semantic differentials are used to study differences in attitudes of some first‐year polytechnic students towards ways of learning mathematics according to the field of study or level of ability of the students. Of particular interest to educational technologists are the attitudes towards audio‐visual aids and individualized instruction. Irrespective of the generalizability of the results, the research is seen as suggesting a methodology for partial course evaluation with minimum interference in the instructional process. Copyright © 1979, Wiley Blackwell. All rights reserved
Thanh, NC, Vigneswaran, S & Polprasert, C 1979, 'OPTIMIZATION OF DUAL‐MEDIA FILTER PERFORMANCE', JAWRA Journal of the American Water Resources Association, vol. 15, no. 5, pp. 1459-1465.
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ABSTRACT: Rapid‐rate filter with sand or anthracite as filter media was studied at filtration rates of 4.5 and 9.0 m3/m2‐h. Different parameters were evaluated by adopting a proposed simplified model. A suitable combination of anthracite‐sand as filter media was given by using corresponding filter parameters of single‐medium filters and break‐even optimization technique. Copyright © 1979, Wiley Blackwell. All rights reserved
Thornton, BS 1979, 'INVERSION OF THE GEOPHYSICAL INVERSE PROBLEM FOR N LAYERS WITH NONUNIQUENESS REDUCED TO N CASES.', Geophysics, vol. 44, no. 4, pp. 801-819.
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A new method is described for reducing nonuniqueness in the geophysical inverse problem for n layers to n cases, provided the ratio of characteristic impedances of sequential layers is of the order of unity and upper and lower layer boundary conditions are known. The method is based on impedance concepts which allow application to a number of different electromagnetic or acoustic experimental methods. Using transformations, the method reduces the nonlinear problem to a linear one as an eigenvalue formulation without approximation. This preserves the nonlinear nature of the problem and increases the significance of the results. Experimental results are given for several electromagnetic applications where the complex permittivity epsilon equals epsilon prime minus i epsilon double prime is determined for shallow (35 m) stratified geosections. The frequency range is dictated by multiples of the electrical or acoustic ″quarter-wave″ thickness of the layers and, in the particular electromagnetic (EM) studies made, it has been 1 to 8 MHz. Application to ocean bottom sub-layering is also proposed, arising from the feasibility of experiments under a conductive lake to which mathematical equivalence is shown.
Waldron, KJ & Sun, JWH 1979, 'CONTROL OF ANGULAR DISPLACEMENT IN BURMESTER SYNTHESIS PROBLEMS.', Urban Systems, vol. 1, pp. 38-41.
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Methods of imposing inequality, or partial equality, constraints on the relative angular displacements of links of planar four-bar linkages synthesized using Burmester's technique have recently been developed as a result of the work of Filemon and of Waldron on the elimination of solutions requiring a change of branch. However, control of these relative displacements has many applications beyond elimination of branch change. The ability to impose inequality constraints on the angular displacements of any joint, or joints, opens a whole new class of synthesis problems. In this paper, a unified theory of the application of inequality constraints on joint angles is presented and illustrated with examples.
Phuoc, HB & Tanner, RI 1979, 'Finite Element Studies of Extrusion and Jets', First National Conference on Rheology : Monash University, Melbourne, May 30 - June 1, 1979, First National Conference on Rheology, Monash University, Monash University, Melbourne, Australia, pp. 3-6.
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Phuoc, HB & Tanner, RI 1979, 'Some Coupled Flow and Heat Transfer Problems', Finite element methods in engineering : proceedings of the third International Conference in Australia on Finite Element Methods, Third International Conference in Australia on Finite Element Methods, Unisearch Ltd., University of New South Wales, Kensington, NSW, Australia, pp. 731-746.
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