Ball, JE 1987, 'A comparison of the hydraulics in three urban drainage models.'.
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Modelling of urban drainage systems is becoming an increasingly important aspect of the management and operation of drainage systems. An important feature of the modelling process is the techniques used in the modelling of both free surfaces and pressurized flow and the different results which alternative techniques will predict. The predicted hydrographs from three models, i.e. ILSAX, SWMM and PIPENET, are compared for situations where free surface and pressurized flow conditions exist in the network. Also discussed will be the theoretical basis for each of the routing techniques employed by these models.
Ball, JE 1987, 'Importance of dynamic wave components for pipe flows.'.
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Presented are the results of an investigation into the magnitude of the terms in the full dynamic wave equation of motion and the influence of neglecting terms upon the predicted hydrograph propagation. A pipe Froude number is proposed as a criteria for selection of the terms in the equation of motion to be included for accurate prediction of hydrograph propagation.
Durance, G, Hogg, GR, Tendys, J & Watterson, PA 1987, 'Studies of equilibrium in the AAEC rotamak', Plasma Physics and Controlled Fusion, vol. 29, no. 2, pp. 227-244.
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LOGANATHAN, P & SUTTON, PM 1987, 'PHOSPHORUS FRACTIONS AND AVAILABILITY IN SOILS FORMED ON DIFFERENT GEOLOGICAL DEPOSITS IN THE NIGER-DELTA AREA OF NIGERIA', SOIL SCIENCE, vol. 143, no. 1, pp. 16-25.
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We investigated in phosphorus (P) status of 12 well-drained to moderately well-drained soil profiles along an east-west transect in the Niger Delta area of Nigeria, by determining available P estimated by the methods of Bray and Kurz no. 1, Bray and Kurtz no. 2, Olsen and Truog, and the various P fractions. Total P in the six profiles of soils developed on Coastal Plain sands (CPS) ranged from 281 to 1469 ppm mean, 821), and total P in the four profiles of soils developed on Meander Belt deposits (MBD) and Sombreiro Warri deposits (SWD) ranged from 63 to 293 ppm (mean, 133). The two profiles in the transitional zone between CPS and SWD had total P of 326 to 595 ppm (mean, 441). Organic P ranged from 11 to 338 ppm and constituted 3 to 44% of total P. Inactive inorganic P accounted for 9 to 65% of total P. The relative abundance of the various active inorganic P forms was, in decreasing or der, Fe-P, Al-P, and Ca-P, except in three of the profiles of MBD-SWD region, where Ca-P was nearly equal to or slightly higher than Al-P. The results showed high availability of P in CPS soils, medium availability of P in the transitional zone, and low P in the MBD and SWD regions. The distribution of P fractions indicated a low degree of development of the soils, especially the MBD and SWD soils. Total P was significantly correlated positively with percentage of clay and negatively with pH and percentage of sand. Fe-P and Al-P had significant correlation with total P, percentage of sands, percent-age of clay, and available P extracted by the methods of Bray and Kurtz no. 1, Bray and Kurtz no. 2, and Truog. © 1987 The Williams & Wilkins Co.
LOGANATHAN, P, ISIRIMAH, NO & NWACHUKU, DA 1987, 'PHOSPHORUS SORPTION BY ULTISOLS AND INCEPTISOLS OF THE NIGER DELTA IN SOUTHERN NIGERIA', SOIL SCIENCE, vol. 144, no. 5, pp. 330-338.
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Phosphorus (P) sorption at equilibrium concentrations of 0.1–2 ppm in 0.01 M CaCl2 by 42 samples of highly acidic surface layers of Ultisols and Inceptisols from three major geomorphological regions of the Niger Delta of Nigeria, West Africa, conformed to the Langmuir isotherm. Langmuir sorption maxima and sorption at 0.2 ppm equilibrium P concentration ranged from 100–767 μ P/g soil and 30–240 fig μ P/g soil, respectively, indicating that the soil samples have low to medium P fertilizer requirements. No significant difference in sorption capacities among the soils of the three geomorphological regions or the two soil orders was noticed. Sorption capacities were significantly correlated with percentages of clay and silt, surface area, and different forms of Fe and Al, but not with pH or organic matter. Multiple regression equations relating P sorption to exchangeable Al, amorphous Al, amorphous Fe, and crystalline Fe are presented, and the relative contributions of these factors in the soils of the three geomorphological regions are discussed. © 1987 The Williams and Wilkins.
Miyanaga, Y, Nagai, N & Miki, N 1987, 'ARMA digital lattice filter based on new criterion', IEEE Transactions on Circuits and Systems, vol. 34, no. 6, pp. 617-628.
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NG, TMJ & HOANG, DB 1987, 'JOINT OPTIMIZATION OF CAPACITY AND FLOW ASSIGNMENT IN A PACKET-SWITCHED COMMUNICATIONS NETWORK', IEEE TRANSACTIONS ON COMMUNICATIONS, vol. 35, no. 2, pp. 202-209.
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Okita, Y, Miyanaga, Y, Nagai, N & Miki, N 1987, 'ARMA digital lattice filters based on geometric approach.', Journal of the Acoustical Society of Japan (E), vol. 8, no. 3, pp. 85-97.
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This paper discusses various ARMA digital lattice filters. The design procedures of these filters have been proposed as various forms. However, if we notice the orthogonal method based on a linear estimation theory, all design procedures are treated with an understandable coherent form. First, this paper examines the ARMA lattice filter whose section increases either AR order or MA order by one independently. The filter section is regarded as elementary. In order to derive this section, the subspace used in the orthogonal projection method is carefully processed with the other subspaces. In other words, this paper shows the implicit dependency in each elementary section. In addition, this paper develops the ARMA filter associated with the Mullis-Roberts' algorithm. This algorithm estimates the AR parameters for the ARMA reference model. Thus, it used to have nothing to do with the construction of the lattice filter. However, if an appropriate subspace is selected, we can design a Mullis-Roberts' algorithm type ARMA lattice filter. In this paper, all relations in the design procedures become clear to understand them easily. © 1987, Acoustical Society of Japan. All rights reserved.
Popolo, SD & Shannon, AG 1987, 'Some aspects of mathematical underachievement in secondary education', International Journal of Mathematical Education in Science and Technology, vol. 18, no. 2, pp. 165-175.
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The purpose of this paper is to demonstrate, in a preliminary fashion, that even though the causes are many, the dynamics of underachievement show a common core of cognitive and motivational factors which are interrelated and which are found in all underachievers. The study involved three groups of selfreferred Year 10 students of mathematics from the lower two of the four classes in the Year 10 at a Sydney high school. Although these students' assessed IQs on Australian Council for Educational Research (ACER) forms ML and MQ ranged from 98 to 130+, their performance, overall, was below expectations when the study commenced. Remedial assistance totalling six hours (nine 45-minute sessions) over a six-week period produced significant improvements in achievement as well as in self-esteem and general study habits. © 1987 Taylor and Francis Group, LLC.
PULMANO, VA, BAKOSS, SL & SHIN, YS 1987, 'A SIMPLIFIED NONLINEAR-ANALYSIS OF CONCRETE FRAMES', MAGAZINE OF CONCRETE RESEARCH, vol. 39, no. 138, pp. 29-34.
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This paper presents a simplified method for the analysis of reinforced concrete frames subjected to sustained service loads. The finite element model used takes into account the non-linearities due to cracking and the time-dependent effects due to creep and shrinkage. It is based on methods widely used by designers at present to analyse short-term linear behaviour. The method is suitable for implementation on microcomputers for applications in the design of medium-rise reinforced concrete frames. Predictions of the behaviour of laboratorytested frames are shown to be in good agreement with measured values. © 1987, Thomas Telford Ltd. All rights reserved.
Pulmano, VA, Bakoss, SL, Shin, YS & Espion, B 1987, 'Discussion: A simplified non-linear analysis of concrete frames', Magazine of Concrete Research, vol. 39, no. 141, pp. 231-234.
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ROPER, H & BAWEJA, D 1987, 'CARBONATION OF CONCRETE AND ITS PREDICTION - DISCUSSION', CEMENT AND CONCRETE RESEARCH, vol. 17, no. 6, pp. 1003-1004.
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SHANNON, AG, CLARKE, JH & HILLS, LJ 1987, 'CONTINGENCY RELATIONS FOR INFECTIOUS-DISEASES', COMPUTERS & MATHEMATICS WITH APPLICATIONS, vol. 14, no. 9-12, pp. 829-833.
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This paper outlines a discrete-time model for the spread of an infectious disease. A partial recurrence relation, which extends the Fibonacci model, is developed from a three-stage process: an immature stage; an infectious stage and a recovery stage. The approach adopted here is essentially aimed at facilitating computational procedures. © 1987.
Sleet, RJ, Shannon, AG & Irvine, B 1987, 'A systematic approach to solving closed problems', International Journal of Mathematical Education in Science and Technology, vol. 18, no. 5, pp. 705-715.
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An investigation of students' unsuccessful attempts to solve a mathematical problem is described, where the students possessed all the prerequisite skills. The results of this study are combined with evidence from previous research to propose a three-stage nine-step procedure for solving closed problems. © 1987 Taylor and Francis Group, LLC.
Vigneswaran, S & Suazo, RB 1987, 'A detailed investigation of physical and biological clogging during artificial recharge', Water, Air, and Soil Pollution, vol. 35, no. 1-2, pp. 119-140.
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An attempt was made to study the physical and biological clogging during artificial recharge with an experimental model that simulates the artificial recharging practice by considering factors such as effective infiltration rate, media size and depth, and inundation period. Recharging was investigated experimentally in terms of suspended solids (SS) removal, 3-day biological oxygen demand (BOD3) removal and chemical oxygen demand (COD) removal at different sand sizes and infiltration rates. To understand the physical phenomenon involved, the effect of suspended solids concentration and initial infiltration rate on cumulative discharge was studied and verified using a simple mathematical model. The simulated cumulative discharge profiles were comparable with the experimental profiles. This indicates that an empirical relationship can be successfully used to predict the biological clogging at different recharge rates. The effect on headloss was also discussed. © 1987 D. Reidel Publishing Company.
Vigneswaran, S & Tien, C 1987, 'Transient behavior of deep-bed filtration of brownian particles', Chemical Engineering Science, vol. 42, no. 11, pp. 2729-2739.
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A new model is proposed for deep-bed filtration of Brownian particles. The model incorporates the unit-collector concept for estimating particle deposition rates and the application of the effective medium approximation (EMT) theory for predicting the instantaneous pressure drop across the filter bed. Case studies are used to show the effects of various variables on filter performance. © 1987.
Voinov, AA & Tonkikh, AP 1987, 'Qualitative model of eutrophication in macrophyte lakes', Ecological Modelling, vol. 35, no. 3-4, pp. 211-226.
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YING, MS 1987, 'A COUNTEREXAMPLE OF GOTTWALD THEOREM', FUZZY SETS AND SYSTEMS, vol. 23, no. 3, pp. 399-400.
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YING, MS 1987, 'FUZZY SEMILATTICES', INFORMATION SCIENCES, vol. 43, no. 3, pp. 155-159.
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Bone, DJ, Bachor, H-A & Sandeman, RJ 1970, 'Level Population Dynamics in a Resonantly Pumped Barium Vapour', Australian Conference on Lasers and Spectroscopy, pp. A-42.
Butler, WB & Baweja, D 1970, 'Long-term durability of fly ash concretes in civil engineering structures', American Concrete Institute, ACI Special Publication, pp. 519-540.
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Results are presented on recent studies undertaken in England, Georgia, U.S.A. and Australia on the durability of a variety of concrete structures containing fly ash. Five of these structures have been in service for over fifteen years and some provided comparisons between fly ash concrete and plain concrete. Details of the fly ashes used in the structures are supported by background data on fly ash availability and use in the areas concerned. Design, construction and service details for the structures are presented along with findings of on-site inspections. Assessments were made of: fly ash hydration characteristics; depth of carbonation; functional efficiency and visible deterioration. Links are ascribed between the determined values.
Indraratna, B & Kaiser, PK 1970, 'Wall convergence in tunnels supported by fully grouted bolts', 28th U.S. Symposium on Rock Mechanics, USRMS 1987, pp. 843-852.
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The scope of this paper is to introduce a method for the design of fully grouted rock bolts in underground excavations. The general design guides and examples presented are intended to facilitate the comprehension and application of the proposed design solution in practice.
