Publications
投稿論文や研究記事の紹介ができたらいいなと思います
中村竜太, 久住孝幸, 大久保義真, 南條博, 南谷佳弘, 赤上陽一, 電界撹拌技術を用いた抗原抗体反応の迅速メカニズムの解明，精密工学会誌 Vol. 85 No.2 (2019) pp. 208-212
By applied electric field mixing (EFM) showed antigen-antibody reaction time in an immunohistochemical staining can be shortened from 90 minutes of conventional method to 10 minutes. In this study, EFM examined the mechanism which makes antigen-antibody reaction of an immunohistochemical staining quicken. As a result, we obtained that it has the mechanism which a reaction time of an immunohistochemical staining is shorten because antigen and antibody improve to increase the frequencies of contact under EFM compared with conventional method. Further, we investigated the effect of AC electric field is applied on antibody. As a result, it found that by applied AC electric field to antibody liquid, antibody dispersed and stabilized, therefore, staining quality is improved.
中村竜太，加賀谷昌美，赤上陽一，池田 洋，久住孝幸，佐藤安弘，南谷佳弘，南條 博, 電界砥粒制御技術を応用した電界非接触微粒子撹拌技術の開発, 精密工学会誌，Vol.80，No.9（2014） pp.862-866.
In this study, we aim to develop innovative stirring technology (electric field non-contact stirring technique (E.N.S.)) applied abrasive control technique with AC electric field. This technique allows for stirring without contact by applying AC electric field to droplets. We examined observation of fundamental behavior and inside behavior for droplet by AC electric field and investigated the feature of electric field non-contact stirring technique as parameter frequency and voltage, quantitatively. As a result, we found that applied voltage affected magnitude of the attractive force acting on droplet, and the resonant frequency of droplet was greatly affected amount of droplet and bottom diameter of droplet, and there is no increase in the droplet temperature, and the motion speed of particles in droplet was accelerated by this stirring technology.
R. Nakamura, A. Iwabuchi, Role of graphite in cast iron on tribological behavior in nano-scratch test, Journal of Advanced Mechanical Design, Systems, and Manufacturing, Vol.6, No.7 (2012) pp.1046-1056.
In previous study, the role of graphite on tribological behavior of cast iron was examined, and the model of cast iron in wear mechanism was proposed. However, this wear mechanism is the model for macro scale test, and has the possibility of showing behavior different from the model shown by the macro scale test in micro-nano scale test. Then, in this study, nano scratch test was carried out by using cast iron and S45C steel as a comparison, it aimed to examine role of graphite in cast iron for the micro-nano scale. As a result, it was understood that the model shown in the macro scale test was the same in micro-nano scale test. And in micro-nano scale, it thought that formation and maintenance of graphite film were dependent on the stick slip phenomenon by increase in indentation depth accompanying increase in load.
中村竜太, 岩渕明, 吉野泰弘, 内舘道正, 成田榮一, 鋳鉄における微視的及び巨視的焼付きメカニズムの研究, 日本機械学会論文集(C編), Vol.77, No.778 (2011) pp.2466-2475.
In this study, seizing was considered as the state when the sliding surface became severe wear according to Nakahara's model. The aim of this research was to evaluate the seizing of cast iron from the viewpoints of temperature rise, coefficient of friction, wear volume and surface state, under two different conditions, and the mechanism of seizing was discussed. Two kinds of seizing were observed, “macro-seizing” and “micro-seizing”. Moreover, a model of the seizing concerning micro and macro-seizing was proposed. When the disturbance like an abrupt increase in load is given in a stable sliding condition, the seizure occurs, followed by plastic flows and an increase in contact area. The contact pressure keeps lower than the critical pressure, the surface becomes smooth and stable sliding is recovered due to the formation of a surface film in the micro-seizing. It seems that the predominant film formed is of graphite at low velocity and oxide at high velocity for cast iron. When the contact pressure becomes greater than critical pressure, the macro-seizing occurs. The apparent critical pressure is 20 MPa at 4.8 m/s for cast iron.
中村竜太, 岩渕明, 内舘道正, 鋳鉄のトライボロジー挙動におけるグラファイトの役割, 日本機械学会論文集(C編), Vol.76, No.772 (2010) pp.3800-3805.
Generally, it is known that graphite decreases friction and wear of cast iron. However, the literatures that logically explained this common sense are few. In this study, we observed the surface before and after friction test in lubricant test and dry test by SEM, EPMA and XPS to clarify the mechanism. In lubrication test and mild wear region of dry test, increase in the carbon content was confirmed on the top surface. However, it has decreased on the top surface in severe wear region of dry test. And, we proposed the wear mechanism that first, graphite in cast iron was extruded in cast iron matrix to the surface by plastic deformation, it was supplied to the top surface, it was rolled and extended on the surface, and ultra thin carbon film of about 2nm was formed on the surface.
中村竜太, 岩渕明, 吉野泰弘, 鋳鉄の摩擦摩耗特性に及ぼす潤滑油の低粘度化, 日本機械学会論文集(C編), Vol.76, No.768 (2010) pp.2148-2153.
In order to preserve environment and save energy, some resembles using low viscous engine oils have been made. We examined the tribological properties in base oils with low viscosities of 8.3, 17.5 and 78.7mPa・s. Friction test was carried out using a lathe, similar to a block on ring tribometer. Block specimen and ring specimen was the same cast iron. Frictional force and temperature rise were measured. As a result, the type of frictional properties and the type of wear curve can respectively be classified into three. Those types corresponded. It is possible to divide by the classification like H type, T type, and B type. For T type, pressure from which oil is supported has lowered as the viscosity lowers. From the PV diagram, it is understood that the area of H type narrows from L3 of a high viscosity as for L1 and L2 of a low viscosity. Moreover, if L1 is compared with L2, the area of B type is growing in L1. This suggests that the possibility of transition to B type that friction and wear keeps increasing when the viscosity is lowered in excess rise.