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  • 1
    Publication Date: 2013-12-24
    Description: Coastal dunefields along the east coast of Korea have long been thought to have originated from beach ridges that prograded during the Holocene, but there has been little chronological evidence based on absolute dating. In this paper, we use optically stimulated luminescence (OSL) dating and ground-penetrating radar (GPR) surveys to reconstruct the coastal progradation of Anin dunefield in the Gangneung area on the east coast of Korea. GPR profiles and sedimentological analyses of four beach-foredune ridges reveal that the ridges are composed mainly of beach deposits showing seaward-dipping and horizontal laminae, capped by eolian sands with landward-dipping laminae. The beach deposits are, in places, underlain by fluvial sands with gravels. Coupled with data from OSL dating, we interpret these results to mean that the fluvial sands and rounded cobbles were deposited in the study area, during the last glacial period. Between the mid-Holocene (~6.5 kyr) and c. 3.5–3.0 kyr, the transgression rate of the sea decreased and coastal progradation occurred. Between c. 3.5 and 3.0 kyr, foreshore sediments, including granules and pebbles, accumulated over the older beach deposits, indicating erosional events. Progradation resumed at ~3.0 kyr and continues to the present. During the past 3 kyr, there has been an average rate of progradation of ~0.14 m/yr. The beach-foredune ridges in the Gangneung area represent the evolution of coastal progradation on the east coast of Korea during the Holocene.
    Print ISSN: 0959-6836
    Electronic ISSN: 1477-0911
    Topics: Geography , Geosciences
    Published by Sage
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  • 2
    Publication Date: 2014-12-11
    Description: Parametric study of a hydraulic centrifugal pump with backward curved blades has been performed numerically using three-dimensional Reynolds-averaged Navier-Stokes equations. The shear stress transport turbulence model was used for analysis of turbulence. The finite volume method and an unstructured grid system were used for the numerical solution. The optimal grid system in the computational domain was selected through a grid dependency test. Tested parameters were related to the geometry of the impeller and volute: seven variables defining the hub and shroud contours and the blades angle of impeller, and two variables defining the inlet width and expansion angle of volute. The effects of these parameters on the hydrodynamic performance of the centrifugal pump have been investigated. It was found that the centrifugal water pump with the twisted blades has the enhancing efficiency compared to the straight blades pump.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 3
    Publication Date: 2011-09-17
    Description: The pore generation technology using PAHM (Poly-acrylonitrile Hollow Microsphere) was studied in order to reduce the weights of tableware. In this study, we verify the property of modified slurry and plasticity of green body by adding PAHM. The modified slurry was prepared by adding 25~55vol% of PAHM to the slurry for whiteware. The viscosity of slurry was controlled to be low value (25~45vol%). However, the viscosity of modified slurry increased and the plasticity of modified green body decreased inside the 45~55vol% range. The formed specimen by slip casting was fired at 1225 °C, 1240°C. As the amount of PAHM content increased, the weight decreased and the addition of 45vol/% of PAHM resulted in a weight drop of 39%. However, when the PAHM content increased, the strength decreases over 50%. This is caused by the presence of a large volume of surface defects (pores) and defects from the agglomeration of PAHM.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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