Yamaguchi, Japan

Oshima National College of Maritime Technology is one of five maritime college in Japan.This college can acquire the licensed mariner of deck or engineer. Wikipedia.


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Kohzuki Y.,Oshima National College of Maritime Technology
Crystal Research and Technology | Year: 2010

It was investigated from (L0 /L)2 versus φ0 curve that the Friedel relation between the effective stress and the average length of dislocation segments, L, is appropriate for the interaction between a dislocation and the monovalent anion in various alkali halides single crystals (NaCl: Br̄, NaBr: Cl̄ or Ī, KCl: Br̄ or Ī, and RbCl: Br̄ or Ī). Here, L0 represents the average spacing of monovalent anions on a slip plane and φ0 is the bending angle at which the dislocation breaks away from the anion at the temperature of 0 K. This is because the anions are the weak obstacles such as impede the dislocation at φ0 above about 150 degrees, where the Friedel relation agrees with the Fleischer one (L 02 = L2(π-φ0)/2). Furthermore, the values of (L/ L0) were found to be within 4.05 to 5.87 for the crystals. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA.


Nakao K.,Yamaguchi University | Furumoto K.,Oshima National College of Maritime Technology | Yoshimoto M.,Yamaguchi University
Journal of Chemical Engineering of Japan | Year: 2012

This work investigates a mechanism and degree for bubble interactions such as bubble clustering, coalescence and breakup to affect the liquid phase mass transfer coefficient k L. Our previous k L data for a normal bubble column (NBC), internal loop airlift (ILBC) and external loop airlift (ELBC) are compared with k LS for single bubbles and k L,BF in the bubble flow (BF) at a fixed mean bubble diameter d B. Our correlations of kL∞ε G 0.1 (NBC and ILBC) and k L∞ε G 0.2 (ELBC) have been found to arise from the relationship for gas holdup ε G=0.5(d B/l) 3, where l is the mean distance between the adjacent bubbles. The reported k L,BF values were reproduced by the Higbie model with the average bubble slip velocity of (gd B 2/ L/)0.5. A factor F=k L,CTF/k L,BF is defined to quantify an effect of the bubble interactions on k L,CTF in the churn-turbulent flow (CTF). The reported correlation gives F=0.5Eo 3/8, where Eo=gd B 2ρ L/σ. Eo<6.4 and Eo>6.4 have been found to give the clustering regime and the coalescence and breakup regime, respectively. Our k L,CTF data (NBC and ILBC) satisfied F=0.5Eo 3/8. F=k L,ELBC/k L,BF for the ELBC roughly correlates as F=1.3. © 2012 The Society of Chemical Engineers, Japan.


Takahashi K.,Oshima National College of Maritime Technology
Journal of the Vacuum Society of Japan | Year: 2014

Removal of small glass spheres on a Si substrate by using adhesion forces between particles and dielectric films was investigated. An upper Si electrode and a dielectric film such as that of polyethylene or polyvinylchloride were placed on a lower Si electrode to which small glass spheres were adhered, and a high voltage was applied to the two Si electrodes for 60 s. The glass spheres had a diameter of 2-20 mm and were adhered to the dielectric film; about 40-50% of the spheres were removed from the Si substrate in the first iteration of a removal process. The removal process was repeated several times, and a high removal rate of about 80% was obtained after the fifth iteration. This implies that the largest glass spheres were removed in the first iteration, and smaller ones were removed in subsequent iterations. The dependence of the particle removal rate on the particle size was evaluated as the ratio of the adhesive force between the particle and film and that between the particle and substrate. Further, it was found that the particle size decreases with the removal rate. This result was in agreement with the experimental result.


Sugino T.,Oshima National College of Maritime Technology | Yamane Y.,Hiroshima University
Key Engineering Materials | Year: 2015

Gloss of a metal surface is an important aspect for product quality evaluation. Evaluating the specular reflection is almost the same as evaluating the gloss. We propose a method that uses patterned area illumination to evaluate specular reflection. In specular reflection, the angle of incidence equals the angle of reflection. Consequently, when light (ray) of the area illumination, which has a striped pattern, are projected on a glossy metal surface, a striped pattern forms on the reflected image as a mirror-like reflection, and the sharpness of the striped pattern of the image provides information about the specular reflection on the surface. This characteristic is applied to a metal with a hairline surface finish. A hairline surface presents different glossiness at different viewpoints. When the direction of the striped pattern of illumination is changed, the sharpness of striped pattern on the reflected image varies owing to the surface roughness of the hairline finish. Therefore, we can evaluate the glossiness in various directions by rotating the pattern. The relationships between gloss evaluation value and surface roughness were indicated in our study. We tried the reproduction of the gloss evaluation by ray tracing to obtain the more detailed relationships between them. Ray tracing is a technique to generate an image in computer graphics. The approximate reproduction of gloss evaluation was obtained by the simulation. © (2015) Trans Tech Publications, Switzerland.


Matsuda N.,Oshima National College of Maritime Technology | Tokutaka H.,2 SOM JAPAN Co.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011

We propose an approach to the determination of class borders on a SOM with non-equal class distributions. Our approach treats the class distribution as a variance-covariance matrix. The class distribution is expressed by a variance-covariance matrix and its decision border between the classes is determined from input data by using the eigenvalues and the corresponding eigenvectors of the matrices. Using the iris dataset of Fisher, it is shown that our approach allows the effect of non-equal class distributions on the decision borders to be successfully visualized in a qualitative and comprehensible manner. © 2011 Springer-Verlag Berlin Heidelberg.


Kohzuki Y.,Oshima National College of Maritime Technology
Philosophical Magazine | Year: 2010

The Friedel relation between the effective stress and the average length of dislocation segments agrees with the Fleischer relation ([image omitted]) in the L0/L versus 0 curve within 150 0 180, where L0 is the average spacing of impurities on a slip plane, L is the impurities along a dislocation and 0 is the angle at which the dislocation embraces the impurity at a temperature of 0 K. Therefore, it was considered that the Friedel relation is suitable for impurity obstacles that impede the dislocation above 0 of about 150 during steady and plastic deformation. In addition, it was confirmed from the value of 0 that the Friedel relation is appropriate for the interaction between a dislocation and the impurity in alkali halides doped with monovalent impurities. This is based on the data obtained by strain-rate cycling tests associated with ultrasonic oscillation at 80 to 300 K.© 2010 Taylor & Francis.


Takahashi K.,Oshima National College of Maritime Technology
Journal of the Vacuum Society of Japan | Year: 2013

This study investigated the removal of glass spheres from the surface of a silicon substrate by using electrostatic adhesion force. An upper silicon electrode and a dielectricfilm, such as polyethylene (PE) and polyvinylchloride, were placed on a lower silicon electrode to which the glass spheres were adhered, and a high voltage was applied to the two silicon electrodes for about 60 s. Glass spheres with a diameter of 0.105-0.125 mm were removed by the PEfilm at voltage of over 500 V, but those with a diameter of 0.04-0.09 mm showed low removal rates. The dielectricfilm could not contact smaller glass spheres deposited near larger ones, which lowered the removal force for the smaller spheres. Repeating the removal process showed a high removal rate of about 90° after thefifth iteration with an applied voltage of 2,510 V. This means that the largest glass spheres were removed by thefirst process, and the smaller ones were removed by the subsequent processes.


Ichibakase T.,Oshima National College of Maritime Technology
Electronics and Communications in Japan | Year: 2011

La0.5Sr0.5CoO3 was used as a cathode for the first time when a plasma display panel was used on a handheld personal computer. It has favorable sputtering resistance characteristics and stable discharge characteristics in gases. A cathode made of La0.5Sr 0.5CoO3 has unique electrical characteristics in early phase discharge voltage and luminescence characteristics. The discharge voltage and luminance continue to decrease from the starting value. The discharge and luminescence area shift of the La0.5Sr0.5CoO3 were investigated by analysis of a DC plasma panel fabricated as a prototype. It is assumed that the shift in the discharge voltage and luminance are caused by a shift in the discharge and luminance area of the cathode surface, and that the shift of the current density is caused by the surface profile of the cathode particles. In order to elucidate this mechanism, a spherical model was applied to the discharge voltage shift, and the shift of the discharge voltage and luminance was simulated by applying this model to the measured values. © 2011 Wiley Periodicals, Inc.


Ichibakase T.,Oshima National College of Maritime Technology
Electronics and Communications in Japan | Year: 2011

La0.5Sr0.5CoO3 was employed as a cathode for the first time when a plasma display panel was used on a handheld personal computer. It has favorable sputtering resistance characteristics and stable discharge characteristics in gases. In this report, the electrical characteristics of La0.5Sr0.5CoO3 are investigated through an analysis of a DC plasma panel fabricated as a prototype. The dimensions of the test plasma panel were measured exactly by an end-measuring machine, and its electrical properties were estimated. In the analysis of the DC plasma panel, LaB6 and metallic Ni cathodes were investigated in the same way, and a comparative analysis was carried out. In the analysis of a sputtering experiment conducted in an AC sputtering apparatus, the sputter rate of La0.5Sr0.5CoO3 was greater than that of LaB6, and the sputter rate of La0.5Sr 0.5CoO3 used as a cathode was smaller than that of other materials. La0.5Sr0.5CoO3 has a greater secondary-emission coefficient γ than LaB6 or metallic Ni. It is inferred that the greater secondary-emission coefficient γ of La 0.5Sr0.5CoO3 reduces the sputter rate when it is used as a cathode. Copyright © 2011 Wiley Periodicals, Inc.


Terashima K.,Toyohashi University of Technology | Kaneshige A.,Oshima National College of Maritime Technology
European Control Conference, ECC 1999 - Conference Proceedings | Year: 2015

This paper presents modeling and control of an overhead traveling crane in a three dimensional(3-D) complex transfer path. A mathematical model of 3-D overhead crane is newly built. It is proposed to feedback a load-position instead of conventional cart-position, in order to evade the collision of load with obstacles and achieve the reduction of both transfer time and residual vibration. In oder to keep control quality against the change of rope length, a variable gain controller using a fixed-pole approach is independently applied in X- and Y- directions. © 1999 EUCA.

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