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Monte Carlo and Molecular Dynamics Studies of the Effects of Additives in Electrodeposition
Yutaka Kaneko,Shuichi Nishimura,Yasuaki Hiwatari,Katsuhiko Ohara,Fujio Asa 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.3
The microscopic effects of additives on the surface structure in electrodeposition have been studied by using the combined method of molecular dynamics and Monte Carlo simulations, which was recently proposed by our group as a new tool for the molecular simulation of electrodeposition. The basic system is a simple model of the solution-electrode interface and additives with inhibiting effects are included in the solution. The additives are assumed to have a spherical shape with an action range of preventing metal deposition on an electrode surface. The simulations are performed using the solutions with and without additives to compare the surface structures. The roughness of the surface is shown to be reduced in the presence of the additives. The relation between the physical properties of the additives and the leveling efficiency is discussed from a dynamical point of view.
Estimations of Regional Stress Based on Measured Local Stress
( Yuzo Obara ),( Katsuhiko Kaneko ),( Seong Seung Kang ) 대한지질공학회 2016 지질공학 Vol.26 No.2
Estimations of regional stress are demonstrated in this paper. Firstly, regional stress is defined and the characteristics of regional stress are then discussed based on the local stresses measured by the Compact Conical-ended Borehole Overcoring (CCBO) technique and the results from the earthquake focal mechanism. Secondly, the regional stresses are estimated by a back analysis of three-dimensional finite element models, using the local stresses measured by the CCBO and hydraulic fracturing.
Kim, Hakman,Fukuda, Daisuke,Kaneko, Katsuhiko,Lee, Juhyung,Cho, Sang-ho Trans Tech Publications 2017 Key Engineering Materials Vol.744 No.-
<P> Mechanical breakage systems are generally employed to demolish a portion of a concrete building, however it is time consuming and costly. And the mechanical demolition work involves various risks such as those associated with occupational safety and presents a noise hazard to the general public living in the vicinity. Therefore, alternative methods for such work have been sought. For this purpose, a dynamic breakage system utilizing diamond-shaped charge holders was proposed to rapidly remove the desired portion of the concrete foundation. The charge holders which initiate crack growth were placed inside a concrete mass along the desired fracture plane. In this study, full-scale blast experiments utilizing the charge holders were introduced and the roughness of fracture planes was observed using a 3-dimensional photography system. In order to verify the effect of the charge holders on fracture controlling in full-scale blast experiments, the fracture processes of the concrete blocks were analyzed using the dynamic fracture process analysis (DFPA) code. The mechanism required to achieve controlled breakage was discussed after taking into account the influence of various loading conditions and crack tip velocity. It was found that the DFPA tool is a useful instrument in the analysis of full scale blast experiments. </P>
In-situ rock stress measurement at an open-pit limestone mine using the CCBO technique
Seong-Seung Kang,Jun-Mo Kim,Katsuhiko Kaneko,Yuzo Obara 한국지질과학협의회 2002 Geosciences Journal Vol.6 No.3
In-situ rock stress measurement is performed toestimate the state of stress at the Torigata open-pit limestone minein Japan using the compact conical-ended borehole overcoring(CBO) technique. The significance of the state of in-situ rockstress to evaluate the stability analysis of rock slope is then dis-cussed. The CCBO technique was applied to the two horizontalboreholes, Borehole BH-1 at location I and Borehole BH-2 at loca-tion II. As a result of in-situ rock stress measured from the twohorizontal boreholes using the CCBO technique, the maximumhorizontal principal stress is in the NNE-SSW direction at present.The measured average vertical normal stress (-6.50 MPa) forBoreholes BH-1 and BH-2 is in good agreement with the estimatedaverage overburden stress (-6.60 MPa). The horizontal normalstreses sxx (-5.10 MPa) and syy (-6.00 MPa) are 78.5-92.3% ofthe vertical normal stress s zz (-6.50 MPa) suggesting that largehorizontal stresses exist in Mount Torigata. The ratio of the hor-izontal normal stress to the vertical normal stress is relativelylarge at the measured location. Accordingly, for an appropriateevaluation of the mining-induced rock slope stability, not only thevertical stres components but also the horizontal stress compo-nents component should be considered.