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( Asit Kumar Gain ),( Ho Yeon Song ),( Byong Taek Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 대한금속·재료학회지 Vol.44 No.6
The continuously porous t-ZrO2 bodies with different pore sizes (90 ㎛, 150 ㎛, 180 ㎛, 260 ㎛) were fabricated using a multi-pass extrusion process. As the sintering temperature increased from 1300 to 1500℃, the bending strength value of porous t-ZrO2 bodies (260 ㎛ pore size) increased and its maximum value was about 157 MPa. On the other hand, as increasing the pore size, the relative density and bending strength values were remarkably decreased. In the porous body having 90 ㎛ pore, the bending strength was about 450 MPa. Human osteoblast like MG-63 cells and osteoclast like Raw 264.7 cells were well grown and through the continuously pores as well as on the surface of the continuously porous t-ZrO2 bodies. The osteoblast cell was grown with spindle shape, condensed circular growth and three-dimensional network type. In contrast, the osteoclast cells were appeared with pebble stone type.
Asit Kumar Roy,Suman Mitra 대한공간정보학회 2020 Spatial Information Research Vol.28 No.2
Quantification of spatio-temporal shoreline dynamics and detection of human induced landscape alterations of Balari Island of Hooghly estuary were conducted in this study. Digital Shoreline Analysis System had been applied to quantify the shoreline dynamics from 2002 to 2017 and End Point Rate model was developed based on this analysis to simulate the probable shoreline of 2030. Landscape transformations had also been assessed by open source geospatial data of 2012 and 2017. Results highlighted that the south-western part of the island was in a depositional phase. Conversely, erosional actions were detected along the northern and north-eastern parts. Predicted shoreline of 2030 revealed that the south-western shoreline would experience massive progression. However, human encroachment in the form of intensive farming had caused considerable deterioration in this already environmentally fragile landscape and thereby calls for immediate mitigation measures.
Gain, Asit Kumar,Lee, Byong-Taek Elsevier 2006 Materials science & engineering. properties, micro Vol.419 No.1
<P><B>Abstract</B></P><P>Continuously porous t-ZrO<SUB>2</SUB> bodies having different pore sizes were fabricated using the multi-pass extrusion process. The pore size depended on the number of extrusion passes, the extrusion ratio, and rod diameter and tube thickness. The pore size dramatically decreased as the number of extrusion passes and tube thickness increased. The pore sizes of the 2nd passed samples, which were made by a feed roll using different rod diameters and tube thickness, were about 260, 180, 150 and 90μm in diameter while the 3rd passed samples which were made with different extrusion ratios (40:1 and 61:1) were about 80 and 35μm in diameter, respectively. In the 2nd passed t-ZrO<SUB>2</SUB> bodies sintered at 1550°C, the relative density and bending strength decreased as the pore size increased. In the 3rd passed sample having a pore size of 35μm, the bending strength increased as the sintering temperature increased up to 1550°C. The maximum bending strength of the 3rd passed t-ZrO<SUB>2</SUB> body was about 297MPa.</P>
AN SIRS EPIDEMIC MODEL ON A DISPERSIVE POPULATION
Ghosh, Asit K.,Chattopadhyay, J.,Tapaswi, P.K. 한국전산응용수학회 2000 The Korean journal of computational & applied math Vol.7 No.3
The spatial spread of a disease in an SIRS epidemic model with immunity imparted by subclinical infection on a population has been considered. The incidence rate of infection and the rate of immunization are both of nonlinear type. The dynamics of the infectious disease and its endemicity in local and global sense have been investigated.