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Mechanical Properties of Uni-Directional Long Bamboo Fiber/Bamboo Powder Composite Materials

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Materials Sciences and Applications 2014年第14期5卷 1011-1019页

作者： shinji Ochi Mechanical Engineering National Institute of Technology Niihama College Ehime Japan

This paper describes the mechanical properties of the composite materials produced using long bamboo fiber and bamboo powder. Bamboo fiber and powder can be hot press-molded much like plastic materials, and the use of these materials in place of plastic products would reduce the environmental impact of extensive plastic use. In this study, the tensile and flexural properties of molded uni-directional long fiber reinforced composites made from bamboo fiber bundles and Bamboo powder were examined. The results showed that the tensile and flexural strength of bamboo fiber/powder composites were increased with increasing fiber content. On the other side, both strengths of composite were decreased with increasing molding temperature after 180℃. The highest tensile and flexural strengths of the bamboo fiber reinforced bamboo powder composites specimens which were tested were recorded at 169.9 MPa and 221.1 MPa, respectively.

关键词： Bamboo Fiber Bamboo Powder Composite Materials Tensile Strength Flexural Strength

Solvability of the Economic Input-Output Equation by Time Irreversibility

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Advances in Linear Algebra & Matrix Theory 2014年第3期4卷 143-155页

作者： shinji Miura Independent Gifu Japan

This paper reinterprets the economic input-output equation as a description of a realized situation without considering decision making. This paper uses the equation that the self-sufficiency rate is added to the Leontief type, and discusses its solvability. The equation has a unique solution if and only if each part of the relevant society satisfies the space-time openness condition. This condition means that commodities which a part of the relevant society possesses are not all inputted to its inside. Moreover, if the process of input and output is time irreversible, each part of the relevant society satisfies the space-time openness condition. Therefore, the solvability of the equation is guaranteed by time irreversibility. This proposition seems to be relevant to the grandfather paradox which is a type of time paradox.

关键词： Input-Output Equation Solvability Time Irreversibility Time Paradox

Investigation of the Characteristics of the 2008 Wenchuan and 2013 Lushan Earthquakes and Their Relationship

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地质学报 2013年第S1期 6-7页

作者： LIN Jian shinji TODA Ross S.STEIN Mustapha MEGHRAOUI Woods Hole Oceanographic Institution Tohoku University U.S.Geological Survey EOST-Institut de Physique du Globe de Strasbourg

This presentation illustrates the characteristics of the 2008 Wenchuan and 2013 Lushan earthquakes, investigates their stress interaction, and discusses the implications on regional seismicity rate changes. In 2008, we calculated that the 12 May 2008 Mw=7.9 Wenchuan earthquake has increased Coulomb failure stress on adjacent major fault systems, including the ends of the 2008 Longmen Shan rupture,

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Fabrication of Manila Hemp Fiber Reinforced Cross Ply Biodegradable Composites and Their Tensile Properties

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Open Journal of Composite Materials 2018年第3期8卷 75-83页

作者： shinji Ochi Department of Mechanical Engineering National Institute of Technology Niihama College Ehime Japan

Natural plant fibers, including flax, kenaf, jute, bamboo, ramie and much more are renewable and sustainable resources and are considered good candidates for cost-effective alternatives to glass and carbon fibers. In this research, cross ply biodegradable composites were fabricated by press-forming method. The biodegradable composites consist of Manila hemp textile as a reinforcement and starch-based biodegradable plastics as a matrix was fabricated and investigated about mechanical properties. The tensile strength increased with the fiber content until fiber content of about 50% and leveled off thereafter. This dependence on the fiber content is due to the decrease in fiber strength of loading direction caused by fiber damages introduced during hot-pressing. In order to decrease the damage of fibers aligned in loading direction, Manila hemp textile was produced by using Manila hemp fibers for warp and biodegradable resin thread for weft. As a result, the tensile strength of cross ply composites increased from 153 MPa to 202 MPa.

关键词： Natural Fiber Biodegradable Plastics Manila Hemp Biocomposites and Mechanical Properties

Current Situation of Drug Abuse and Countermeasures in Japan

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Journal of Sociology Study 2016年第8期6卷 539-551页

作者： shinji Nakamura National Police Academy Tokyo Japan

Flexural Properties of Long Bamboo Fiber/ PLA Composites

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Open Journal of Composite Materials 2015年第3期5卷 70-78页

作者： shinji Ochi Department of Mechanical Engineering National Institute of Technology Niihama College Ehime Japan

This paper describes the flexural properties of biodegradable composites made using natural fiber and biodegradable plastics. Biodegradable composites were fabricated from bamboo fiber bundles and PLA (polylactic acid) resin. In this research, effect of molding temperature and fiber content on flexural properties of bamboo fiber reinforced composites was investigated. The flexural strength of this composite increased with increasing fiber content up to 70%. The flexural strength of composites decreased at molding temperature of 180°C. Biodegradable composites possessed extremely high flexural strength of 273 MPa, in the case of molding temperature of 160°C and fiber content of 70%.

关键词： Bamboo Fiber PLA Biodegradable Composites Natural Fiber Flexural Strength

Non-Singularity Conditions for Two Z-Matrix Types

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Advances in Linear Algebra & Matrix Theory 2014年第2期4卷 109-119页

作者： shinji Miura Independent Gifu Japan

A real square matrix whose non-diagonal elements are non-positive is called a Z-matrix. This paper shows a necessary and sufficient condition for non-singularity of two types of Z-matrices. The first is for the Z-matrix whose row sums are all non-negative. The non-singularity condition for this matrix is that at least one positive row sum exists in any principal submatrix of the matrix. The second is for the Z-matrix which satisfies where . Let be the ith row and the jth column element of , and be the jth element of . Let be a subset of which is not empty, and be the complement of if is a proper subset. The non-singularity condition for this matrix is such that or such that for? . Robert Beauwens and Michael Neumann previously presented conditions similar to these conditions. In this paper, we present a different proof and show that these conditions can be also derived from theirs.

关键词： Z-Matrix M-Matrix Non-Negative Matrix Diagonal Dominance

Quantification of Revenue Induction and Expenditure Reflux in a Monetary Economy

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Advances in Linear Algebra & Matrix Theory 2015年第1期5卷 25-35页

作者： shinji Miura Independent Gifu Japan

In a monetary economy, expenditure induces revenue for each agent. We call this the revenue induction phenomenon. Moreover, in a special case, part of the expenditure by an agent returns as their own revenue. We call this the expenditure reflux phenomenon. Although the existence of these phenomena is known from the olden days, this paper aims to achieve a more precise quantification of them. We first derive the revenue induction formula through solving the partial money circulation equation. Then, for a special case, we derive the expenditure reflux formula. Furthermore, this paper defines the revenue induction coefficient and the expenditure reflux coefficient, which are the key concepts for understanding the two formulas, and examines their range.

关键词： Monetary Economy Money Circulation Revenue Induction Expenditure Reflux

Micropulse laser trabeculoplasty under maximal tolerable glaucoma eyedrops:treatment effectiveness and impact of surgical expertise

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International Journal of Ophthalmology(English edition) 2021年第3期14卷 388-392页

作者： shinji Kakihara Takao Hirano Akira Imai Taihei Kurenuma Yoshiaki Chiku Toshinori Murata Department of Ophthalmology Shinshu University School of MedicineMatsumotoNagano 390-8621Japan

AIM:To evaluate the effectiveness of micropulse laser trabeculoplasty(MLT)for eyes with open angle glaucoma(OAG)under maximal tolerable glaucoma eyedrops and to assess the effect of expertise performing MLT on its clinical ***:Medical records of 42 consecutive eyes of 34 patients diagnosed with OAG who underwent MLT were retrospectively *** effectiveness was determined using the Kaplan-Meier survival *** was defined as an intraocular pressure(IOP)reduction of21 mm Hg during two consecutive follow-up visits,or surgical intervention for *** determine the impact of MLT surgical expertise on clinical effectiveness,the eyes were divided into two groups according to whether the procedure was conducted by an experienced specialist(defined as a glaucoma specialist who had conducted at least ten MLT procedures)or a less experienced glaucoma *** difference in expertise was determined using a log-rank ***:MLT was conducted by three glaucoma *** overall survival rates were 0.76,0.48,and 0.44 at 1,3,and 6 mo,*** survival rates for MLT performed by a less experienced glaucoma specialist were 0.62,0.31,and 0.25(n=21 eyes)at 1,3,and 6 mo,respectively,whereas the survival rates for MLT performed by an experienced glaucoma specialist were 0.90,0.64,and 0.64(n=21 eyes)at 1,3,and 6 mo,*** log-rank test showed a significant difference in the survival curves of the two groups(P=0.0061).CONCLUSION:The 6-month effectiveness of MLT for controlling IOP is relatively limited in eyes with OAG using maximal tolerable glaucoma ***,its effectiveness may be improved if performed by a glaucoma specialist with sufficient MLT experience.

关键词： micropulse laser trabeculoplasty open angle glaucoma inter-operator variability