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Practical studies on rockfall simulation by DDA

Journal of Rock Mechanics and Geotechnical Engineering 2011年第1期3卷 57-63页

作者： Hiroyuki Matsuyama satoshi nishiyama Yuzo Ohnishi West Nippon Expressway Co. Ltd. School of Civil Engineering Kyoto University Kyoto University

In this paper,simulations of real rockfall by discontinuous deformation analysis (DDA) are *** the simulations,the energy losses of rockfall are categorized into three types,*** loss by friction,the loss by collision,and the loss by *** of the energy loss using absolute parameters is conducted by the DDA ***,in order to verify the applicability and validity of the proposed DDA,field tests on rockfall and corresponding simulations of rockfall tests by DDA are *** simulated results of rockfall velocity and rockfall jumping height agree well with those obtained from the field ***,the new technique properly considers the energy-absorption ability of slope based on vegetation condition and shape of the rockfall,and provides a new method for the assessment and preventive design of rockfall.

关键词： discontinuous deformation analysis (DDA) rockfall numerical simulations field experiment cut slope highway

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Numerical Modelling and Simulation of Chemical Reactions in a Nano-Pulse Discharged Bubble for Water Treatment

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Plasma Science and Technology 2016年第9期18卷 924-932页

作者：何雨辰 satoshi UEHARA Hidemasa TAKANA Hideya nishiyama Graduate school of Engineering Tohoku University Institute of Fluid Science Tohoku University

A zero-dimensional model to simulate a nano-pulse-discharged bubble in water was developed. The model consists of gas and liquid phases corresponding to the inside and outside of the bubble, respectively. The diffusions of chemical species from the gas to the liquid phase through the bubble interface was also investigated. The initial gas is Ar, but includes a little H20 and 02 in the bubble. The time evolution of the OH concentration in the liquid phase was mainly investigated as an important species for water treatment. It was shown that OH was generated in the bubble and then diffused into the liquid. With the application of a continuous nano-pulse discharge, more OH radicals were generated as the frequency increased at a low voltage for a given power consumption.

关键词： chemical reaction model water purification bubble discharge diffusion

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Relationship between Perioperative N-Terminal Pro-Brain Natriuretic Peptide (NT-proBNP) and Complications in Thoracic Surgery

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Open Journal of Thoracic Surgery 2018年第2期8卷 29-36页

作者： Kantaro Hara Takuma Tsukioka Nobuhiro Izumi Kyukwang Chung Hiroaki Komatsu Michihito Toda Hikaru Miyamoto satoshi Suzuki Takuya Kimura Toshihiko Shibata Noritoshi nishiyama Department of Thoracic Surgery Osaka City University Hospital Osaka Japan

Background: In cardiac surgery, the N-terminal pro-brain natriuretic peptide (NT-proBNP) level is reportedly correlated with the onset of postoperative complications. We examined the relationship between the NT-proBNP level and perioperative complications in thoracic surgery and elucidated the significance of NT-proBNP measurement. Methods: We evaluated 48 patients excluding hemodialysis patients who underwent lung resection from November 2015 to February 2016. NT-proBNP measurement was performed three times preoperatively on postoperative days 2 and 5. We examined the relationship between clinical background factors such as preoperative comorbidity and the development of postoperative complications. Based on established criteria for surgical complications (Clavien-Dindo classification), grade ≥ II was defined as a complications. We classified the patients into two groups (with or without complications) and compared and examined the background factors between the groups. Results: The study included 48 patients (33 male, 15 female) with an average age of 72 years (range, 35 - 86 years). Preoperative comorbidities included cardiovascular disease in five patients, diabetes mellitus in four, and chronic obstructive pulmonary disease in six. The average operation time was 163 (29 - 308) minutes, and the bleeding volume was 30 (10 - 620) ml. Early complications were confirmed in 11 patients, and late complications were confirmed in 7 patients. A high NT-proBNP level on postoperative day 5 was an independent risk factor for late complications. Conclusion: The perioperative NT-proBNP level is considered to be a predictor of complications. Its measurement is useful for predicting postoperative complications, and careful perioperative management is required for patients with high levels.

关键词： NT-proBNP Perioperative Management Lung Resection Postoperative Complications

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