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Scaling Crater Dimensions: Implications for the Mercury’s Cratering Record
Yu Kyung Shin,Yongjae Yu 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
Morphological description of Mercury’s impact craters was investigated using crater diameter (D), excavation depth (h), and/or compensation–related depth (h*). Volumes of impact craters are determined using a spherical cap geometry as nominal volume (V) and compensation-related volume (V*). Degree of correlation is represented as coefficient of determination (R2). There is a strong correlation between pairs of h versus D (R² = 0.998) and h* versus D (R² = 0.999). Crater-to-depth ratio and D displayed a weak inverse correlation (R² = 0.726 for D/h versus D; R² = 0.553 for D/h* versus D). As anticipated from a spherical cap geometry, excavated volume of impact crater is proportional to D as V = 0.012 × D<SUP>2.843</SUP>. On the same token, a linear relation between the volume of impact crated determined from compensation depth and D is observed as V* = 0.024 × D<SUP>2.929</SUP>. As far as the present study is concerned, it should be highlighted that h* is linked with h on Mercury with a relation of h* = 1.686 × h - 0.101 in kilometers.
柳知雅(Yu Jia),金智恩(Kim Jieun),鄭容在(Chung Yongjae) 미술사연구회 2017 미술사연구 Vol.- No.32
Dry lacquer Buddha statues are fundamentally made using hemp and lacquer. The form of the Buddha statue is fashioned from clay and other materials, then repeatedly covered with layers of fabric and lacquer that will fill the holes in the hemp. Once this process is complete, the clay form is removed from the inside of the statue. Unlike those of gilt bronze, molded and wooden statues, this manufacturing process distinct is highly complex and produces a very light statue. In this study, we used scientific analysis to determine the material characteristics of the dry lacquer seated Medicine Buddha (Bhaisajyaguru) and Bodhisattva of Wisdom (Manjusri) statues at Cheongnyangsa Temple in Bonghwa. Microscopy and color reaction were used to identify textile and paper fibers. We also analyzed the adhesive used to bond the lacquered textile layers. Results indicated that the fibers in the lacquered textile layers were hemp. Paper fibers in the urna, part of the inner neck, and the base of the statue were identified as types of traditional Korean hanji paper, made from mulberry bast fiber. In case of the Medicine Buddha statue, comparative analysis with purpose-made reference samples identified the adhesive used in part of the inner neck and lacquer used in central textile layers as a type of plant-derived resin. This study has confirmed the material properties of dry lacquer seated Buddha statues at Cheongnyangsa Temple. It is hoped that it will be used as a source of basic data for scientific analysis of the material properties of other dry lacquer Buddha statues in the future.