Aubrey, T & White, P 1992, 'Simple numerical integration of logarithmic singularities in moment method solutions of electromagnetic problems', Electronics Letters, vol. 28, no. 16, pp. 1519-1521.
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Moment method solutions to electromagnetic problems can require the integration of functions containing logarithmic singularities. A simple technique for the numerical integration of these singularities is presented. The technique is applied in the calculation of the self-impedance of a surface dipole. The convergence of the solution using this method is compared to the convergence of existing methods. © 1992, The Institution of Electrical Engineers. All rights reserved.
Avenel, O, Xia, JS, Andraka, B, Jee, CS, Xu, M-F, Qian, YJ, Lang, T, Moyland, PL, Ni, W, Signore, PJC, Adams, ED, Ihas, GG, Meisel, MW, Stewart, GR, Sullivan, NS & Takano, Y 1992, 'Magnetic measurements ofCeAl3to below 1 mK', Physical Review B, vol. 45, no. 10, pp. 5695-5698.
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Baweja, D, Munn, RL, Roper, H & Sirivivatnanon, V 1992, 'Situ assessments of long-term performance of plain and blended cement concretes', Transactions of the Institution of Engineers, Australia. Civil engineering, vol. CE34, no. 2, pp. 115-127.
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Between 1987 and 1990, selected elements from ten individual structures from within four facilities were examined to assess the long-term performance of concretes used. Structural members examined encompassed slabs on grade, suspended slabs and wharf elements. Individual concretes forming the selected structures had binders of normal portland cement, portland cement with fly ash or ternary systems of fly ash, ground granulated blast furnace slag and portland cement. Slag aggregates were used in certain of the concretes. Interest focused on the long-term in-service durability of the concretes. Conclusions were drawn with respect to the performance of the concretes.
Briscoe, BJ, Thomas, PS & Williams, DR 1992, 'Microscopic origins of the interface friction of organic films: The potential of vibrational spectroscopy', Wear, vol. 153, no. 1, pp. 263-275.
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CAO, HT & SIRIVIVATNANON, V 1992, 'CORROSION OF STEEL IN CONCRETE WITH AND WITHOUT SILICA FUME - REPLY', CEMENT AND CONCRETE RESEARCH, vol. 22, no. 1, pp. 188-189.
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DHARMAPPA, H, VERINK, J, FUJIWARA, O & VIGNESWARAN, S 1992, 'Optimization of granular bed filtration treating polydispersed suspension', Water Research, vol. 26, no. 10, pp. 1307-1318.
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The need for economic optimization of a filter unit leading to its least cost design with respect to filtration velocity, run time, depth and medium size has long been identified but there are no algorithms towards this end. In this study, an algorithm incorporating a NLP (non-linear programming) software (NPSOLâSystem Optimization Laboratory, Stanford University, Calif.) and response surface methodology (RSM) is presented for optimal design and operation of a filter unit. Also, the simulation model included in the optimization takes into account the polydispersity of the influent. The optimization results obtained using laboratory data have shown that the filter design and operating parameters are highly dependent on the particle size distribution (PSD) of the influent. The cost of the filter unit with influent having the same total particles mass concentration and turbidity but with greater fraction of fine particles was about 46% higher. This demonstrates the importance of incorporating PSD instead of suspended solids (SS), turbidity units (TU) or volume average diameter in the design and operation of filter units. The proposed approach, however, is applicable only for single medium filters. Further research is warranted to extend it to dual and tri media filters.
Dharmappa, HB, Verink, J, Ben Aim, R, Yamamoto, K & Vigneswaran, S 1992, 'A comprehensive model for cross-flow filtration incorporating polydispersity of the influent', Journal of Membrane Science, vol. 65, no. 1-2, pp. 173-185.
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A semi-empirical model is presented for the prediction of foulant deposit thickness and concentration, and thereby, predicting the permeate flux in cross-flow microfiltration and ultrafiltration. The scope of the model is limited to colloidal suspensions (i.e. non-diffusive solutes) and its hallmark is its applicability to polydispersed influents. The theoretical model was verified with experimental observations and found to yield a fairly good agreement with an error less than 62% of the average flux over 100 min of filtration. However, evaluation of model coefficients a and b is necessary through laboratory studies. The model was successfully used to predict the effect of particle size distribution (PSD) on permeate flux. The simulation results corroborate the contention that the long-term flux decline is due to the reduction is foulant deposit permeability via infiltration of fines into the cake, thereby demonstrating the importance of influent particle size distribution (PSD) on foulant deposit permeability. The proposed model is a first step towards the modeling of polydispersed influents. As such there is a lot of scope for further refinements which is briefly discussed.
Dr. Pocock, NA, Sambrook, PN, Nguyen, T, Kelly, P, Freund, J & Eisman, JA 1992, 'Assessment of spinal and femoral bone density by Dual X-Ray absorptiometry: Comparison of lunar and hologic instruments', Journal of Bone and Mineral Research, vol. 7, no. 9, pp. 1081-1084.
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Abstract Clinical application of techniques for assessing bone mineral density (BMD) requires accurate and precise measurements that can be related to clearly defined normal ranges. In this study we investigated the clinical interpretation of BMD values in a group of individuals measured on the same day with two different dual-energy x-ray densitometers (Lunar DPX and Hologic QDR 1000). The BMD results were analyzed as absolute values in g/cm2 and with respect to young and age-specific normals as defined by each manufacturer. Absolute BMD values measured by the two instruments were highly correlated (lumbar spine r = 0.98, femoral neck r = 0.95; p < 0.0001). In the lumbar spine, the two instruments assigned almost identical values when expressed as a percentage of age-matched values and as a percentage of young normals, despite a small but systematic difference between the values assigned for the latter index. In the femoral neck, however, there were significant differences in assignments between instruments, expressed both as a percentage of young normal (mean difference 6.2%) and with respect to age-matched values (mean difference 3.3%). In particular, in premenopausal subjects femoral neck values with the Hologic instrument were assigned significantly lower values. This study shows effective comnparability between these two instruments for absolute and relative values for the lumbar spine, as well as for absolute values at the femoral neck, but important differences for normality assignments at the femoral neck. These latter differences may produce bias in the “diagnosis” of femoral neck osteoporosis and may have important implications for clinical decision making. Until these differences are resolved, clinicians should not rely solely on femoral neck BMD measurements in clinical decision making.
Esselle, KP & Stuchly, MA 1992, 'Neural stimulation with magnetic fields: analysis of induced electric fields', IEEE Transactions on Biomedical Engineering, vol. 39, no. 7, pp. 693-700.
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Esselle, KP & Stuchly, MA 1992, 'Simplified analytical solutions for magnetic stimulation of neurons', Applied Computational Electromagnetics Society Journal, vol. 7, no. 2, pp. 162-178.
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Strong pulses of magnetic field are used to stimulate peripheral nerves and motor neurons in the cerebral cortex. Such stimulation is used in neurology for numerous diagnostic purposes. The electric field induced in tissue along the neuron and its spatial derivative are the parameters determining neural response. Another important parameter influencing the efficiency of stimulation is the inductance of a coil producing the magnetic field, as it defines the current time derivative for a given pulse generator. For arbitrarily located coils of arbitrary shapes, a semi-analytical solution is presented to calculate spatial distributions of the electric field and its spatial derivatives in a semi-infinite tissue model. Analytical solutions are given for coils composed of linear segments parallel or perpendicular to the air-tissue interface. Expressions for inductance of coils having suitable geometries for neural stimulation are derived. Coils can be optimized for stimulation of nerves at given orientation and distance from the air-tissue interface. In the optimization, coil dimensions and shape are considered as they affect both the induced field and inductance. A quadruple coil consisting of triangular sections appears to offer some advantages over other shapes for stimulation of shallow nerves. For deep nerves spaced quadruple square and three-dimensional coils are preferred.
Guang-Quan, Z 1992, 'Fuzzy number-valued fuzzy measure and fuzzy number-valued fuzzy integral on the fuzzy set', Fuzzy Sets and Systems, vol. 49, no. 3, pp. 357-376.
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Guang-Quan, Z 1992, 'On fuzzy number-valued fuzzy measures defined by fuzzy number-valued fuzzy integrals I', Fuzzy Sets and Systems, vol. 45, no. 2, pp. 227-237.
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Guang-Quan, Z 1992, 'On fuzzy number-valued fuzzy measures defined by fuzzy number-valued fuzzy integrals II', Fuzzy Sets and Systems, vol. 48, no. 2, pp. 257-265.
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Guang-Quan, Z 1992, 'The structural characteristics of the fuzzy number-valued fuzzy measure on the fuzzy σ-algebra and their applications', Fuzzy Sets and Systems, vol. 52, no. 1, pp. 69-81.
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In this paper, some structural characteristics of the fuzzy number-valued fuzzy measure on the fuzzy σ-algebra are discussed. On the fuzzy number-valued fuzzy measure space, the concepts of 'almost' and 'pseudo-almost' are introduced, and Riesz's theorem, Lebesgue's theorem and Egoroff's theorem for sequences of fuzzy measurable functions and some convergence theorems for sequences of fuzzy number-valued fuzzy integrals on fuzzy sets are proved by some structural characteristics of the fuzzy number-valued fuzzy measure. © 1992.
Guo, YJ & Barton, SK 1992, 'A high-efficiency quarter-wave zone plate reflector', IEEE Microwave and Guided Wave Letters, vol. 2, no. 12, pp. 470-471.
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A multilayered quarter-wave zone plate reflector antenna operating in the microwave range is presented. The theory for designing the reflector and experimental results are given. An efficiency of 55% was obtained with a prototype reflector antenna. © 1992 IEEE
HADGRAFT, R & WIGAN, M 1992, 'On-the-job Training for Engineers Using Hypertext', European Journal of Engineering Education, vol. 17, no. 2, pp. 159-165.
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There is a pressing need for more efficient methods of delivering updated engineering information, especially in the workplace. Hypertext offers the author the ability to structure information in ways which are more flexible than conventional print media. The intention of presenting training material using hypertext is to develop an explorative attitude in the reader. The reader is encouraged to follow his/her own path through the material, with the option of following some topics to a greater depth than would normally be expected. Hypertext also provides a tightly integrated package of information, guidance, and often also the ability to execute programs or procedures described in the document. It can also provide concise support for experts as well as assistance—in the same document. This paper (i) outlines the concepts and facilities in typical hypertext implementations, (ii) describes the reactions that have been obtained in the use of an on-line code of practice (Australian Rainfall and Runoff), and (iii) offers some guidelines for structuring engineering documents for hypertext. © 1992, Taylor & Francis Group, LLC. All rights reserved.
HADGRAFT, RG 1992, 'Experiences of Two Problem-oriented Courses in Civil Engineering', European Journal of Engineering Education, vol. 17, no. 4, pp. 345-353.
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Current engineering courses are not structured to develop real problem-solving skills in their students. They rely on a bottom-up approach to learning, where the first three years is spend mostly on theory, with almost no practice at problem definition. Instead, the students spend most of their time solving carefully designed exercises. Real-world problems are not as neatly packaged as these exercises, and, as a consequence, graduate engineers often lack the problem-definition and problem-recognition skills that are essential if the theory they have learned is to be useful to them. On the contrary, a problem-oriented course requires the students to develop those problem recognition skills. It also is intended to develop student-directed learning, and group and communication skills. A problem-oriented approach was used in 1991 in two second-year courses in civil engineering—surveying and computing. The courses were well received by the students, and the average exam result for surveying showed a noticeable improvement, while the average exam result for computing showed a marginal improvement. (There were, however, other encouraging signs in the computing course. The author believes that the difference in response between the two subjects is due to the difference between working in groups and working individually, and a course change for the computing subject for 1992 is proposed. © 1992, Taylor & Francis Group, LLC. All rights reserved.
Indraratna, B & Nutalaya, P 1992, 'Reinforcement of planar discontinuities in elastic rock', Geotechnical and Geological Engineering, vol. 10, no. 2, pp. 135-140.
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Indraratna, B, Balasubramaniam, AS & Balachandran, S 1992, 'Performance of Test Embankment Constructed to Failure on Soft Marine Clay', Journal of Geotechnical Engineering, vol. 118, no. 1, pp. 12-33.
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Indraratna, B, Balasubramaniam, AS, Phamvan, P & Wong, YK 1992, 'Development of negative skin friction on driven piles in soft Bangkok clay', Canadian Geotechnical Journal, vol. 29, no. 3, pp. 393-404.
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This paper describes the results of short-term pullout tests and long-term full-scale measurements of negative skin friction on driven piles in Bangkok subsoils. Two instrumented cylindrical (hollow) prestressed concrete piles were fully equipped with two independent load-measurement systems, load cells, and telltale rods. Pore pressures and ground movements in the vicinity of the piles were monitored throughout the period of investigation. The effect of bitumen coating on negative skin friction was also studied. The long-term behaviour of driven piles was compared with the estimated values obtained from short-term pullout tests and soil strength data. It was found that the negative skin friction can be predicted well by the effective stress approach using values of β between 0.1 and 0.2. The load–settlement and load–transfer behaviour were numerically modelled to acquire a more comprehensive understanding of negative skin friction developed on driven piles. A settlement-controlled concept is also introduced for piles subjected to negative skin friction, on the basis of these findings. Key words : consolidation, downdrag, driven pile, embankment, finite elements, pore pressures, pullout, settlements, soft clay.
James, M & Hoang, D 1992, 'Design of low-cost, real-time simulation systems for large neural networks', Journal of Parallel and Distributed Computing, vol. 14, no. 3, pp. 221-235.
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Systems with large amounts of computing power and storage are required to simulate very large neural networks capable of tackling complex control problems and real-time emulation of the human sensory, language, and reasoning systems. General-purpose parallel computers do not have communications, processor, and memory architectures optimized for neural computation and so cannot perform such simulations at reasonable cost. This paper analyzes several software and hardware strategies to make feasible the simulation of large neural networks in real-time and presents a particular multicomputer design able to implement these strategies. An important design goal is that the system must not sacrifice computational flexibility for speed as new information about the workings of the brain and new artificial neural network architectures and learning algorithms are continually emerging. © 1992.
Kelly, P, Nguyen, T, Pocock, N, Hopper, J, Sambrook, P & Eisman, J 1992, 'A genetic effect on rates of change in bone density with aging: A twin study', Bone and Mineral, vol. 17, pp. 139-139.
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LEYDEKKERS, P & TEUNISSEN, B 1992, 'SYNCHRONIZATION OF MULTIMEDIA DATA STREAMS IN OPEN DISTRIBUTED ENVIRONMENTS', LECTURE NOTES IN COMPUTER SCIENCE, vol. 614, pp. 94-104.
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This paper presents a study of synchronization mechanisms for real-time video, audio and text data streams. Synchronization is an important and complex issue when multimedia information, stored at geographically distributed locations, has to be transport
Malan, NT, Van Der Merwe, JS, Huisman, HW, Kruger, A, Eloff, FC, Pretorius, PJ & Laubscher, PJ 1992, 'A comparison of cardiovascular reactivity of rural blacks, urban blacks and whites', Stress Medicine, vol. 8, no. 4, pp. 241-246.
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AbstractUrbanization is a worldwide phenomenon and is most often accompanied by an increased prevalence of western‐type diseases like hypertension. The higher cardiovascular reactivity (CVR) of black people compared to white people during passive coping stressors has often been linked to their greater vulnerability to hypertension. Blacks, however, display a lower CVR than whites during active coping stressors. In this study it was found that urban blacks show a higher CVR than whites during a passive coping stressor and a lower CVR than whites during an active coping stressor. However, rural blacks consistently show much higher CVR than either whites or urban blacks during both active and passive coping stressors. It seems that CVR is not only a function of the type of stressor applied but can be altered significantly by environmental factors like those experienced during urbanization.
Mukherjee, S & Waldron, KJ 1992, 'An Exact Optimization of Interaction Forces in Three-Fingered Manipulation', Journal of Mechanical Design, vol. 114, no. 1, pp. 48-54.
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Manipulation with three fingers in frictional contact is known to be an underspecified problem. The minimum norm solution, also referred to as the equilibrating solution field, can be modified by superimposing a linear combination of the resulting null solutions, called the interaction force field. The modification proposed here, applicable to the three-dimensional problem, minimizes the maximum value of the friction angle at the points of contract. A grasp of maximum possible stability under a set of contact and loading conditions is hence achieved.
MURTHY, V & WALDRON, KJ 1992, 'POSITION KINEMATICS OF THE GENERALIZED LOBSTER ARM AND ITS SERIES-PARALLEL DUAL', JOURNAL OF MECHANICAL DESIGN, vol. 114, no. 3, pp. 406-413.
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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 compari
Oberst, S, Villwock, W & Renwrantz, L 1992, 'WESTERN blot analysis of plasma components of the three Tilapia species, Oreocbromis aureus, O. niloticus and Sarotherodon galilaeus', Journal of Applied Ichthyology, vol. 8, no. 1-4, pp. 278-292.
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OLLERTON, RL & SHANNON, AG 1992, 'An extension of circular and hyperbolic functionsAn', International Journal of Mathematical Education in Science and Technology, vol. 23, no. 4, pp. 611-635.
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The ordinary circular and hyperbolic functions are extended in a natural way as functions with recurring derivatives. Many of the usual properties are maintained or enhanced and this leads to a deeper understanding of the original functions. © 1992 Taylor and Francis Ltd.
Quek, KH, Bliss, PJ & Ball, JE 1992, 'Hydrodynamics of sedimentation basin (part I)-model development', Transactions of the Institution of Engineers, Australia. Civil engineering, vol. CE34, no. 1, pp. 37-47.
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Conventional approaches for the design of sedimentation basins based on the Camp-Hazen concept of ideal settling have failed to explain the observed behaviour of many settling basins under normal operating conditions due to neglect of processes such as turbulent mixing, recirculation, short circuiting, flow variations, differences in basin configuration, and influences of inlet and outlet structures. Presented in this paper (Quek et al., 1991a) is a computationally efficient hydrodynamic model for simulating the flow in rectangular sedimentation basins. The model is based on a finite difference solution of the vorticity transport and streamfunction equations, with a constant eddy viscosity whose magnitude was determined from calibration of the model against experimental data. The model can be implemented economically on smaller computers e.g., Personal Computers, thus increasing the likelihood of its use by practising engineers.
Quek, KH, Bliss, PJ & Ball, JE 1992, 'Hydrodynamics of sedimentation basin (part II)-model validation and application', Transactions of the Institution of Engineers, Australia. Civil engineering, vol. CE34, no. 1, pp. 49-56.
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The calibration and validation of a computationally efficient hydrodynamic model (Quek et al., 1991c) is presented in this paper using previously published data of velocity profiles in a rectangular flume. The hydrodynamic model is applied to study the flow field in a rectangular primary sedimentation basin. The predicted velocity profiles are compared with field measurements obtained by Heinke et al. (1977). The effects of different basin design features on the flow patterns are investigated in this paper by application of the hydrodynamic model.
SAMBROOK, P & NGUYEN, T 1992, 'Vertebral Osteoporosis in Rheumatoid Arthritis Patients: Effect of Low Dose Prednisone Therapy', Rheumatology, vol. 31, no. 8, pp. 573-573.
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Sapiano, PC, Holbeche, RJ, Burnett, IS & Pulley, DR 1992, 'Modulation recognition by neural network techniques', Proceedings of IEEE Int. Symp. on Communications.
STEWART, MG 1992, 'A HUMAN RELIABILITY ANALYSIS OF REINFORCED CONCRETE BEAM CONSTRUCTION', Civil Engineering Systems, vol. 9, no. 3, pp. 227-250.
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A significant proportion of performance failures (c.g., structural failure, cost overruns, delays) are due to human error in the construction of in-situ reinforced concrete elements. A Human Reliability Analysis (HRA) model has been developed to simulate the effect of human error on the construction of a reinforced concrete beam. The proposed HRA model incorporates the effect of (i) initial errors (i.e., before engineering inspections) and (ii) errors remaining after engineering inspections. The following typical construction tasks are considered: number and size of reinforcing bars, effective depth of steel reinforcing, beam width, and quality of concrete mix. Human performance models are described for each of these microtasks. It was found that human error leads to a significant loss of structural safety. It was also shown that engineering inspections significantly increased structural reliability, but the resulting structural reliability was still an order of magnitude lower than “nominal” estimates of structural reliability. © 1992, Taylor & Francis Group, LLC. All rights reserved.
Stewart, MG 1992, 'Modelling human error rates for human reliability analysis of a structural design task', Reliability Engineering & System Safety, vol. 36, no. 2, pp. 171-180.
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It is generally accepted that human error, particularly in design, causes a significant proportion of structural failures. It is necessary to understand the 'micro' (or single task) behaviour of human errors before the entire system can be modelled. Reported herein is a description of proposed mathematical models of error occurrence that are suitable for use in a Human Reliability Analysis (HRA). These models may be used to provide error rate information. These models are fitted to realistic error occurrence data. The data was obtained from practising professional engineers and the tasks performed were cognitive; namely, calculation, table look-up and ranking tasks. These tasks are commonly encountered in typical design calculations. It was found that error occurrence behaviour is characterised by variation of error rates between individuals and, to a lesser extent, correlation of error rates for individuals. The effect of response time and experience were also examined. A comparison of the effect on structural reliability (for a typical structural design task) for error occurrence (based on the proposed models) is also reported. © 1992.
Stewart, MG 1992, 'Simulation of human error in reinforced concrete design', Research in Engineering Design, vol. 4, no. 1, pp. 51-60.
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Available statistical data suggest that human error in design causes a significant proportion of performance failures; namely, structural failure, cost overruns, and delays. A Human Reliability Analysis (HRA) model has been developed to simulate the effect of human error on the design computations of a reinforced concrete beam. The proposed HRA model incorporates the effect of 'self-corrections'; this is a process where tasks are re-evaluated if the result appears to be not within 'reasonable' expectations. Calculation, table look-up, chart look-up, and table ranking microtasks were incorporated into the proposed HRA model; human perormance data are described for each of these microtasks. It was found that human error, particularly multiple errors, lead to a significant loss of structural safety. © 1992 Springer-Verlag New York Inc.
Stuchly, MA & Esselle, KP 1992, 'Factors affecting neural stimulation with magnetic fields', Bioelectromagnetics, vol. 13, no. S1, pp. 191-204.
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Veitch, D 1992, 'Windows of stability in control chaos', IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, vol. 39, no. 10, pp. 808-819.
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Vigneswaran, S & Dharmappa, HB 1992, 'Industrial waste minimisation: concepts and technology', National Conference Publication - Institution of Engineers, Australia, no. 92 pt 5, pp. 103-107.
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As the industrialisation takes a leap ahead threatening to incur serious damage to environment, it is necessary to protect the environment through more conservative efforts. Towards this end traditional 'End-of-the-pipe treatment' is grossly inadequate and to achieve the desired results, it is necessary to integrate the pollution control right into the heart of the industrial processes. This not only results in less pollution but also helps in recycling of valuable nonrenewable resources, often with a considerable amount of cost saving. This technology is called 'Waste Minimisation' or 'Low or No Waste Technology (LNWT)'. This paper highlights some of the advantages of LNWT and the methods to implement LNWT in industry. The methodologies are illustrated with some examples. Finally criteria for comparison of various methodologies and the need for research and development are brought out.
Virk, AS & Pradhan, B 1992, 'Prediction of the digestibility of organic matter, metabolizable energy content and dry matter intake of tropical feeds with the Hohenheim feeding value test (Gas Test)', INDIAN JOURNAL OF DAIRY SCIENCE, vol. 45, pp. 226-226.
WATTERSON, PA, ZHU, JG & RAMSDEN, VS 1992, 'OPTIMIZATION OF PERMANENT-MAGNET MOTORS USING FIELD CALCULATIONS OF INCREASING PRECISION', IEEE TRANSACTIONS ON MAGNETICS, vol. 28, no. 2, pp. 1589-1592.
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An algorithm is given for the fast optimization over a constrained domain of an objective function calculated iteratively. To apply the algorithm to optimizing the efficiency of permanent magnet synchronous motors, an iterative magnetic field calculatio
YING, MS 1992, 'A NEW APPROACH FOR FUZZY TOPOLOGY .2.', FUZZY SETS AND SYSTEMS, vol. 47, no. 2, pp. 221-232.
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We introduce the concepts of interior, boundary, subspace, connected space, first- and second-countable spaces, and establish some of their properties in fuzzifying topology.
YING, MS 1992, 'ANOTHER VERSION OF THE FUNDAMENTAL THEOREM OF ULTRAPRODUCT OF LATTICE-VALUED MODELS', CHINESE SCIENCE BULLETIN, vol. 37, no. 17, pp. 1491-1492.
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NA
YING, MS 1992, 'COMPACTNESS, THE LOWENHEIM-SKOLEM PROPERTY AND THE DIRECT-PRODUCT OF LATTICES OF TRUTH VALUES', ZEITSCHRIFT FUR MATHEMATISCHE LOGIK UND GRUNDLAGEN DER MATHEMATIK, vol. 38, no. 5-6, pp. 521-524.
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We show that compactness is preserved by arbitrary direct products of lattices of truth values and that the Lowenheim-Skolem property is preserved by finite direct products of lattices of truth values. MSC: 03C07, 03B50.
YING, MS 1992, 'THE FUNDAMENTAL THEOREM OF ULTRAPRODUCT IN PAVELKAS LOGIC', ZEITSCHRIFT FUR MATHEMATISCHE LOGIK UND GRUNDLAGEN DER MATHEMATIK, vol. 38, no. 3, pp. 197-201.
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In [This Zeitschrift 25 (1979), 45-52, 119-134, 447-464], Pavelka systematically discussed propositional calculi with values in enriched residuated lattices and developed a general framework for approximate reasoning. In the first part of this paper we i
Zhengneng, L & Li, J 1992, 'Study on the single-peak over-load retardation effect of three-dimensional small cracks', Acta Aeronautica et Astronautica Sinica, vol. 3.
Zhou, JL & Banks, CJ 1992, 'Humic acid removal from water by biosorptton', Environmental Technology, vol. 13, no. 8, pp. 727-737.
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Avenel, O, Xu, J, Xia, JS, Xu, M-F, Andraka, B, Lang, T, Moyland, PL, Ni, W, Signore, PJC, van Woerkens, CMCM, Adams, ED, Ihas, GG, Meisel, MW, Nagler, SE, Sullivan, NS, Takano, Y, Talham, DR, Goto, T & Fujiwara, N 1970, 'Low temperature magnetic measurements of NENP', Journal of Low Temperature Physics, SYMP ON QUANTUM FLUIDS AND SOLIDS, Springer Science and Business Media LLC, PA, PENN STATE UNIV, UNIVERSITY PARK, pp. 547-550.
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Bone, D & Stevenson, D 1970, 'Modelling of Colour Hard Copy Devices Using Regularised Linear Splines', APRS workshop on Colour Imaging and Applications.
DUCHIEN, L, GAY, V & HORLAIT, E 1970, 'DESIGN OF AN INTEGRATED X400 FILESTORE', UPPER LAYER PROTOCOLS, ARCHITECTURES AND APPLICATIONS, IFIP TC6/WG6.5 International Conference on Upper Layer Protocols, Architectures and Applications, ELSEVIER SCIENCE PUBL B V, VANCOUVER, CANADA, pp. 395-407.
DUCHIEN, L, GAY, V, HORLAIT, E & MACHINERY, AC 1970, 'X.400-BASED DISTRIBUTED APPLICATION DESIGN METHODOLOGY', 1992 ACM COMPUTER SCIENCE CONFERENCE, PROCEEDINGS, 20TH ANNUAL COMPUTER SCIENCE SYMP, ASSOC COMPUTING MACHINERY, KANSAS CITY, MO, pp. 517-523.
Gelbard, G, Breton, F, Charreyre, M & Dong, D 1970, 'Polypyridine‐based catalysts: Epoxidation of olefins with supported peroxotungstic complexes', Makromolekulare Chemie. Macromolecular Symposia, Wiley, pp. 353-361.
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AbstractEpoxidation of cyclohexene with hydrogen peroxide was performed with tungsten‐based catalysts in the form of polymer supported pyridinium peroxotungstate salts and betaines. These catalysts were obtained from copolymers of 4‐vinylpyridine and divinylbenzene or from aminomethylpyridines alkylated with chloromethylpolystyrene. The free bases and the corresponding N‐oxides were reacted with peroxotungstic acid to give the catalytic species.
Guo, YJ & Barton, SK 1970, 'Flat printed zone plate antennas for DBS reception', IEE Conference Publication, pp. 355-358.
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A systematic investigation on flat printed phase correcting zone plate reflector antennas is presented. A multi-layered structure is proposed and a circular quarter-wave zone plate reflector with 54.8% efficiency is reported. When the zone plate reflector is offset, the circular zones become elliptical ones with their centers moved away successively from where the feed is pointed at. Experimental results on an offset half-wave zone plate reflector is given. Unfortunately, the antenna sidelobe level shown in the paper is much worse than that of the CCIR standard, which presently limits the zone plate reflectors as reception-only antennas. However, more recent experiments have shown that the sidelobes of the quarter-wave zone plate reflectors can be significantly improved by introducing better phase compensation and various approaches are being investigated.
Guo, YJ & Barton, SK 1970, 'On the sidelobe performance of Fresnel zone plate antennas', IEEE Antennas and Propagation Society International Symposium 1992 Digest, IEEE Antennas and Propagation Society International Symposium 1992 Digest, IEEE, pp. 2175-2178 vol.4.
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Hanson, CM, Beratan, HR, Owen, RA, Corbin, M & McKenney, S 1970, 'Uncooled thermal imaging at Texas Instruments', SPIE Proceedings, San Diego '92, SPIE.
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Husain, M & Waldron, KJ 1970, 'Direct position kinematics of the 3-1-1-1 Stewart platforms', American Society of Mechanical Engineers, Design Engineering Division (Publication) DE, pp. 89-97.
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In this work, a closed form solution of the direct position kinematics problem of a special class of Stewart Platform is presented. This class of mechanisms has a general feature that the top platform is connected to the six limbs at four locations. Three limbs connect at one location and the remaining limbs connect to the top platform singly at three separate locations. The base platform is connected at six different locations as is the case in the general platform. This particular class of mechanism is termed as 3-1-1-1 mechanism in this paper. It has been shown that there are a maximum of sixteen real assembly configurations for the direct position kinematics problem. This has been verified using a geometric argument also. The numerical example solved in this paper demonstrates that it is possible to obtain a set of solutions which are all real.
Indraratna, B 1970, 'Influence of bolts on discontinuities and yielding rock - conceptual developments', pp. 249-254.
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The paper highlights the conceptual developments in rock mechanics applied to quantify the effect of bolts in the stabilization of joints and yielding soft rocks.
Lin, CT & Lee, CSG 1970, 'Real-time supervised structure/parameter learning for fuzzy neural network', [1992 Proceedings] IEEE International Conference on Fuzzy Systems, [1992 Proceedings] IEEE International Conference on Fuzzy Systems, IEEE, pp. 1283-1291.
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The authors propose a real-time supervised structure and parameter learning algorithm for constructing fuzzy neural networks (FNNs) automatically and dynamically. This algorithm combines the backpropagation learning scheme for the parameter learning and a novel fuzzy similarity measure for the structure learning. The fuzzy similarity measure is a new tool to determine the degree to which two fuzzy sets are equal. The FNN is a feedforward multi-layered network which integrates the basic elements and functions of a traditional fuzzy logic controller into a connectionist structure which has distributed learning abilities. The structure learning decides the proper connection types and the number of hidden units which represent fuzzy logic rules and the number of fuzzy partitions. The parameter learning adjusts the node and link parameters which represent the membership functions. The proposed supervised learning algorithm provides an efficient way for constructing a FNN in real time. Simulation results are presented to illustrate the performance and applicability of the proposed learning algorithm.
Nanua, P & Waldron, KJ 1970, 'Instability and chaos in quadruped gallop', American Society of Mechanical Engineers, Design Engineering Division (Publication) DE, pp. 599-604.
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A dynamic model for the two dimensional quadruped has been developed. The main body is modelled as a rigid bar and each leg consists of a constant stiffness spring, a viscous damper and a force actuator. Based on symmetry principles, a controller has been devised that will enable the quadruped to gallop at constant speed. The controller consists of two parts: an energy controller which will apply the required amount of force through the legs, and the speed controller that will control the forward speed by appropriately placing the legs. It will be shown that the body pitch need not be explicitly controlled. The stability of this controller will be examined using Poincare maps. Stable systems show either periodic or quasi-periodic response. This system also exhibits chaotic behavior and chaotic response leads to instability. The stability of the system with changes in the initial conditions, as well as variations in the system parameters, will also be examined. It will be shown that the system is stable for a range of leg stiffnesses. Outside this range, the system shows chaotic behavior.
Nelson, P, Sirivivatnanon, V & Khatri, R 1970, 'Development of high volume fly ash concrete for pavements', Proceedings - Conference of the Australian Road Research Board, pp. 37-47.
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This paper describes the development of high volume fly ash (HVFA) concrete for pavements. Concretes with fly ash content (40% and above by weight of the total binder fractions) were designed for structural grades. The workability, mechanical and long-term volume stability properties were evaluated. It was found that HVFA concrete with characteristic compressive strength up to 50 MPa could be designed having fresh concrete properties similar to plain cement concrete with the exception of setting times. For concretes of similar strength grades, it was found that the flexural strength and elastic modulus properties of HVFA concretes were similar to plain cement concretes. HVFA concretes were found to have a 15-20% lower drying shrinkage at 56 days than companion plain cement concretes. These reductions increased to 15-25% at 91 days. The setting times were increased by one to six hours depending on the type of cement and percentage of fly ash used. The concretes also developed considerable strength after 24 hours to withstand loading from normal construction activities. Trial production and placing of these concretes for apron slabs and road pavements was carried out at the Pacific Power's Mount River Piper Station. It ws found that HVFA concrete could be produced and placed successfully through normal concreting practices including pumping. Long term performance of these concretes are being monitored.
NGUYEN, TV, SAMBROOK, PN, KELLY, PJ, LORD, S, FREUND, J & EISMAN, JA 1970, 'BODY SWAY AND BONE-MINERAL DENSITY ARE PREDICTORS OF FRACTURE PREVALENCE - THE DUBBO OSTEOPOROSIS EPIDEMIOLOGY STUDY', JOURNAL OF BONE AND MINERAL RESEARCH, BLACKWELL SCIENCE INC, pp. S112-S112.
SAMBROOK, PN, BIRMINGHAM, J, KELLY, P, KEMPLER, S, NGUYEN, T, POCOCK, N & EISMAN, JA 1970, 'PREVENTION OF CORTICOSTEROID OSTEOPOROSIS - A COMPARISON OF CALCIUM, CALCITRIOL AND CALCITONIN', JOURNAL OF BONE AND MINERAL RESEARCH, BLACKWELL SCIENCE INC, pp. S96-S96.
Stuchly, MA & Esselle, KP 1970, 'Electromagnetic Stimulation of Neurons', AMPC Asia-Pacific Microwave Conference,, AMPC Asia-Pacific Microwave Conference,, IEEE, pp. 221-223.
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© 1992 IEEE. Motor neurons in the cerebral cortex and peripheral nerves can be stimulated by externally applied pulses of an electromagnetic field produced by a coil. Analyses have been performed of a simplified tissue model and various coil shapes and positions with respect to the nerve. Coils are optimized in terms of their geometry (shape and dimensions) and position considering the strength and focality of the nerve stimulus. A quadruple coil consisting of triangular sections appears to offer advantages in stimulation of shallowly-located nerves. For deep nerves, quadruple square or three-dimensional coils are preferred.
TOKITA, A, KELLY, P, SAMBROOK, PN, NGUYEN, TV, LESLIE, A, RISTELI, J & EISMAN, JA 1970, 'GENETIC-DETERMINANTS OF TYPE-I COLLAGEN DEGRADATION AND SYNTHESIS - FURTHER EVIDENCE FOR GENETIC-REGULATION OF BONE TURNOVER', JOURNAL OF BONE AND MINERAL RESEARCH, BLACKWELL SCIENCE INC, pp. S132-S132.
Venkataraman, SC, Kinzel, GL & Waldron, KJ 1970, 'Optimal synthesis of four-bar linkages for four-position rigid-body guidance with selective tolerance specifications', American Society of Mechanical Engineers, Design Engineering Division (Publication) DE, pp. 651-659.
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In practical rigid-body guidance problems, very often one or more of the design positions need not be generated exactly. Further, extreme accuracy at the design positions is somewhat pointless considering the inherent limitations in linkage manufacturing processes. This emphasizes the requirement of synthesis techniques to be able to handle tolerance specifications on the nominal design positions. A favorable offshoot of the tolerance incorporation would be the accompanying increase in the solution space of the synthesis problem thereby yielding better linkage solutions.
Waldron, KJ 1970, 'Actively controlled mobility systems', TENCON'92 - Technology Enabling Tomorrow, TENCON'92 - Technology Enabling Tomorrow, IEEE, pp. 332-336.
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© 1992 IEEE. The author discusses the coordination problem which arises in vehicles with large numbers of independently actuated joints designed to operate in unknown terrain. Coordination requires a considerable amount of sensor data. Some of this may be available from sensors required by other machine systems. Other necessary data mandates installation of sensor systems which would not otherwise be required. Much of the technology discussed is based on the adaptive suspension vehicle legged vehicle. An important application area for this technology is in planetary rover vehicles. A number of the diverse designs under study are reviewed with regard to their coordination requirements.
Xia, JS, Ni, W & Adams, ED 1970, 'Order of the PP-HFP transition in solid3He', Journal of Low Temperature Physics, SYMP ON QUANTUM FLUIDS AND SOLIDS, Springer Science and Business Media LLC, PA, PENN STATE UNIV, UNIVERSITY PARK, pp. 355-364.
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Xianghua Wu & Dissanayake, MWMG 1970, 'A Generalized Classification And Coding System For Computer Aided Process Planning', IEEE International Workshop on Emerging Technologies and Factory Automation,, IEEE International Workshop on Emerging Technologies and Factory Automation,, IEEE, pp. 156-160.
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© 1992 IEEE. Most previous studies on computer aided process planning (CAPP) have shown that conventional group technology (GT) based classification and coding systems do not contain sufficient component information for producing an effective and flexible CAPP system. In this paper we present a generalized classification and coding system which combines GT codes, feature-based codes and specification data bases. The proposed coding system is based on a relational data structure. Information not amenable to coding is stored in data bases. The proposed technique retains all component information necessary for CAPP, which may be easily retrieved using a decoding process. A detailed example to illustrate the proposed method is also presented.
Xu, J, Avenel, O, Xia, JS, Xu, M-F, Lang, T, Moyland, PL, Ni, W, Adams, ED, Ihas, GG, Meisel, MW, Sullivan, NS & Takano, Y 1970, 'Nuclear demagnetization cryostat at University of Florida Microkelvin laboratory', Journal of Low Temperature Physics, SYMP ON QUANTUM FLUIDS AND SOLIDS, Springer Science and Business Media LLC, PA, PENN STATE UNIV, UNIVERSITY PARK, pp. 719-722.
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