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Your search keyword '"Sekine, Ryo"' showing total 25 results
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25 results on '"Sekine, Ryo"'

1. Assessment of Water Absorption and Retention Capacities of Waste-Based Stabilizers to Treat Soft Clay Used as Subgrade Soils

Author

Kassa, Alula, Sekine, Ryo, Hayano, Kimitoshi, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Cui, Zhen-Dong, Series Editor, Lu, Xinzheng, Series Editor, Rujikiatkamjorn, Cholachat, editor, Xue, Jianfeng, editor, and Indraratna, Buddhima, editor

Published
2025
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3. Development of Surgical Simulator Providing Force Feedback from Organs

Author

Sekine, Ryo, Miura, Satoshi, Ceccarelli, Marco, Series Editor, Agrawal, Sunil K., Advisory Editor, Corves, Burkhard, Advisory Editor, Glazunov, Victor, Advisory Editor, Hernández, Alfonso, Advisory Editor, Huang, Tian, Advisory Editor, Jauregui Correa, Juan Carlos, Advisory Editor, Takeda, Yukio, Advisory Editor, and Okada, Masafumi, editor

Published
2023
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24. Vanadium Speciation in Ancient Shales Revealed through Synchrotron-Based X-ray Spectroscopy

Author

William W. Bennett, Enzo Lombi, Kirk G. Scheckel, Ryo Sekine, Scott G. Johnston, Edward D. Burton, Daryl L. Howard, Peter Kappen, Donald E. Canfield, Bennett, William W, Lombi, Enzo, Scheckel, Kirk G, Sekine, Ryo, Johnston, Scott G, Burton, Edward D, Howard, Daryl L, Kappen, Peter, and Canfield, Donald E

Subjects
paleoredox, Atmospheric Science, sediment, speciation, Space and Planetary Science, Geochemistry and Petrology, synchrotron, vanadium, XANES
Abstract

Refereed/Peer-reviewed Redox-sensitive trace elements, such as vanadium, are frequently used as paleoredox proxies to infer the redox status of ancient marine depositional environments. When applied to vanadium, this approach relies on an accurate understanding of vanadium geochemistry in marine sediments. This, in turn, requires the application of analytical techniques capable of providing reliable chemical information on vanadium host phases of vanadium and thus the ability to distinguish authigenic from detrital phases. The increasing availability of synchrotron-based X-ray spectroscopic techniques capable of providing chemical speciation information at both the bulk and micro-scale presents an opportunity to refine our understanding of vanadium geochemistry in ancient marine sediments. Here, we show the utility of synchrotron-based X-ray absorption near-edge structure (XANES) spectroscopy and scanning X-ray fluorescence microscopy (SXFM) for investigating vanadium host phases in ancient marine sediments. The studied samples from the 1400 Ma Xiamaling Formation came from strongly contrasting depositional settings (ranging from oxic to euxinic) with a wide range of vanadium enrichments (enrichment factors from 0.7 to 9.6), yet vanadium speciation determined by XANES was consistently found to be phyllosilicate-hosted vanadium (III). High-resolution elemental imaging by SXFM coupled with global statistical colocalization analyses revealed strong associations between vanadium and potassium, consistent with vanadium hosted by potassium-rich clay minerals. These findings, while demonstrating the power of synchrotron-based X-ray methods, imply that differentiating authigenic and detrital vanadium in ancient marine sediments is unlikely to be possible given that post-depositional processes result in similar chemical speciation for both fractions. This will also limit the reliability of vanadium isotope system studies that depend on differentiating authigenic and detrital fractions using selective extraction procedures.

Published
2023
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25. Combination design of drive mechanism considering delay of surgical robot.

Author

Sekine R and Miura S

Subjects
Minimally Invasive Surgical Procedures, Neurosurgical Procedures, Robotics, Robotic Surgical Procedures
Abstract

Surgical robots have contributed greatly to the development of minimally invasive surgery. However, these robots suffer from issues such as the looseness of wires acting as the robot's drive mechanism, and high maintenance cost. The objective of this study was to derive a combination of driving mechanisms other than wires that satisfies the required positional accuracy of a surgical robot. The robot operation trajectory was obtained using a virtual surgical simulator. Based on the operation trajectory obtained in the suture task experiment, the delay of each joint was virtually simulated, and the robot's position was calculated. The positions of the robot with and without delay were compared, and the drive mechanism combinations that satisfy the required positional accuracy were obtained. Thus, satisfactory accuracy was achieved when the alternative drive mechanism was properly placed.Clinical Relevance- This paper presents an accurate and low-maintenance surgical robot that uses few wires and alternative drive mechanisms.

Published
2023
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