Zobrazeno 1 - 10
of 136
pro vyhledávání: '"Yoshiyuki SHIMIZU"'
Publikováno v:
Journal of Marine Science and Engineering, Vol 12, Iss 9, p 1470 (2024)
REE-rich mud under the seabed at a 5500–5700 m water depth around Minamitorishima island and polymetallic nodules buried in the deep seabed are very promising and attractive to explore and develop. REEs are critical to develop due to the recent par
Externí odkaz:
https://doaj.org/article/c6ebead520184a54911edaad56c48e5b
Publikováno v:
Journal of MMIJ, Vol 136, Iss 5, Pp 40-51 (2020)
The mud flow between the borehole and the drill pipe in well drilling can be regarded as the flow of nonNewtonian fluids through a concentric annulus. In recent years, the Herschel-Bulkley rheological model is recommended as a general fluid model of
Externí odkaz:
https://doaj.org/article/09fab0711e784f5e8fa3e6d5a64c04db
Autor:
Yoshiyuki SHIMIZU, Nobuo HATAKEYAMA, Eigo HANAMURA, Kazuo WATANABE, Yuka YOKOYAMA, Tadashi MASUYAMA
Publikováno v:
Journal of MMIJ, Vol 135, Iss 7, Pp 52-62 (2019)
Flow characteristics of slurry with rare-earth rich mud are investigated to examine lifting systems for mining rare-earth elements from deep seabed. Twelve samples, extracted from different locations and depths from seabed around the Minamitorishima
Externí odkaz:
https://doaj.org/article/7ed8b2420f39423b84e16b2c1c4e243d
Publikováno v:
Journal of MMIJ, Vol 135, Iss 2, Pp 15-24 (2019)
The rheological properties of cement slurries (including fresh concrete and high concentration paste for filling etc.) are complicated, therefore they are approximated by the Bingham plastic model. In recent years, the application of Herschel-Bulkley
Externí odkaz:
https://doaj.org/article/2de9832e6b0b4ae7a3d91c9bcfed339f
Autor:
Nao Okuda, Miyako Kyogoku, Yu Inata, Kanako Isaka, Kazue Moon, Takeshi Hatachi, Yoshiyuki Shimizu, Muneyuki Takeuchi
Publikováno v:
PLoS ONE, Vol 16, Iss 3, p e0247360 (2021)
BackgroundIt is important to evaluate the size of respiratory effort to prevent patient self-inflicted lung injury and ventilator-induced diaphragmatic dysfunction. Esophageal pressure (Pes) measurement is the gold standard for estimating respiratory
Externí odkaz:
https://doaj.org/article/3d81496c2b514ebabeff169a4da27d74
Publikováno v:
Journal of MMIJ, Vol 134, Iss 10, Pp 142-150 (2018)
A numerical analysis is conducted to examine an air-lift pumping system for mining rare-earth rich mud under 6000m deep seabed around the Minami-Tori-Shima. The numerical scheme in the analysis adopts the one-dimensional drift-flux model, which solve
Externí odkaz:
https://doaj.org/article/4bc17f6899c544968592f55ca5b98ac9
Autor:
Yusuke Naito, Yoshiyuki Shimizu, Takeshi Hatachi, Yu Inata, Kazue Moon, Kazuya Tachibana, Muneyuki Takeuchi
Publikováno v:
JA Clinical Reports, Vol 4, Iss 1, Pp 1-4 (2018)
Abstract Background The intensity of the electrical activity of the diaphragm (Edi) correlates with inspiratory effort. The ratio of tidal volume to the Edi is known as neuroventilatory efficiency (NVE) and is used as an index for ventilation efficie
Externí odkaz:
https://doaj.org/article/f4b2cbd04bae4ab8b41f1d40a78dc543
Publikováno v:
Journal of MMIJ, Vol 134, Iss 2, Pp 31-40 (2018)
One of the authors has developed a numerical simulator of airlift pump to solve governing equations represented by the drift flux model. The solver is based on the finite volume method which is known as SIMPLER algorithm for numerical scheme. The cal
Externí odkaz:
https://doaj.org/article/81526065cdc94942a5e2e3c6c000aa0f
Publikováno v:
Journal of MMIJ, Vol 133, Iss 10, Pp 241-249 (2017)
A numerical simulator is developed as a part of a Japanese National hydrate research program (MH21, funded by METI) to examine performance of methane gas production system from methane hydrate layer under deep seabed. The simulator solves mass and mo
Externí odkaz:
https://doaj.org/article/df099ff05b324921914740909677cb2e
Publikováno v:
Journal of MMIJ, Vol 133, Iss 7, Pp 157-164 (2017)
The flow through annuli is encountered in drilling operation, in which drilling mud flows between the borehole wall and the drilling pipe. Some drilling muds, depending on their prepared materials, exhibit nonNewtonian characteristics and in many cas
Externí odkaz:
https://doaj.org/article/e95bf45ae4de42979df3b2fedda00c88