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44 results on '"Chan, E.S."'

26. Stress Waves in Composite Laminates Excited by Transverse Plane Shock Waves

Author

Liu, G.R., Lam, K.Y., and Chan, E.S.

Subjects
Mechanics of Materials, Mechanical Engineering, Geotechnical Engineering and Engineering Geology, Condensed Matter Physics, Mathematics::Geometric Topology, lcsh:Physics, lcsh:QC1-999, Civil and Structural Engineering
Abstract

A simple 1-dimensional model is presented to investigate elastic stress waves in composite laminates excited by underwater explosion shocks. The focus is on the elastic dynamic stress fields in the composite laminate immediately after the action of the shock wave. In this model, the interaction between the laminate and the water is taken into account, and the effects of the laminate-water interaction on the stress wave fields in the laminate are investigated. In the formulation of the model, wave fields in the laminate and the water are the first obtained in the frequency domain and then transferred into the time domain using the Fourier transform techniques. A quadrature technique is used to deal with the Fourier transform integrals in which the integrands have very sharp peaks on the integral axis. Numerical examples for stress waves in a steel plate and a glass reinforced plastic sandwich laminate are presented. The technique and the results presented in this article may be used in the design of ship hull structures subjected to underwater explosions.

Published
1996
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34. Three-dimensional ecological-eutrophication model for Singapore

Author

Gin, K.Y.H., Zhang, Q.Y., Chan, E.S., and Chou, L.M.

Subjects
Eutrophication -- Models, Water -- Composition, Engineering and manufacturing industries, Environmental issues
Abstract

A 3D multilevel eutrophication model has been developed and applied to the tropical coastal waters of Singapore. The model considers the nitrogen, phosphorus, and carbon cycles; phytoplankton and zooplankton dynamics; and dissolved oxygen balance in the water column coupled to benthic processes and is driven by a 3D multilevel hydrodynamic model. The eutrophication model was calibrated with field data obtained from the Southwest Monsoon in August 1998 and subsequently validated using data from the Northeast Monsoon in December 1998. Predictions of nutrient and phytoplankton concentrations from the model simulation agreed well with the observed data. The model results show that the coastal waters of Singapore are relatively well-mixed and differences in concentration with depth for all state variables are generally

Published
2001

44. New Insights into Segmental Packing, Chain Dynamics and Thermomechanical Performance of Aliphatic Polyurea Composites: Comparison between Silica Oxides and Titanium (III) Oxides

Author

Khanisya Palaniandy, Eng Seng Chan, Sheik Ambarine Banon Auckloo, Giuseppe Cavallaro, Pooria Pasbakhsh, Palaniandy K., Auckloo S.A.B., Cavallaro G., Chan E.S., and Pasbakhsh P.

Subjects
titanium (III) oxide, silica oxide, Materials science, polyurea dynamics, Polymers and Plastics, General Chemical Engineering, Organic Chemistry, Titanium(III) oxide, chemistry.chemical_element, chemistry.chemical_compound, chemistry, Chain (algebraic topology), Materials Chemistry, segmental packing, Composite material, solvent-free polyurea, Settore CHIM/02 - Chimica Fisica, Titanium, Polyurea
Abstract

Polyurea (PU) is intrinsically reinforced by its microphase-separated morphology, giving its excellent mechanical properties. In this study, it is shown how a high-index PU formulation applies easy diffusion of hard segments into the soft phase of the PU matrix and tune its chain mobility. Moreover, the interaction of micro (>100nm), nano (

Published
2021
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