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Study of Needle Lift Behavior of Diesel Injector
Get PDFapplication/pdfUsing an injector with a lift sensor, the needle valve openings during injection were measured. Injection with different maximum needle valve openings was achieved by varying the injection signal to injector. A laser 2-focus velocimeter (L2F) was used for measurements of velocity and size of droplets inside diesel sprays intermittently injected into the atmosphere by using 8-hole injector nozzle. The diameter of the nozzle orifice was 0.125mm. The rail pressure was set at 40 MPa. Measurement plane was located at 7 mm downstream from the nozzle exit. The spray image was taken by the high-speed camera, and the spray width was evaluated by using spray image. The spray width at low maximum needle valve opening was wider than those at high maximum needle valve opening. Droplet velocity is lower and droplet size is smaller at low than at high maximum needle valve opening. Radial distances of measurement position were nondimensionalized by maximum spray width. The effect of the maximum needle valve opening on droplet velocity and size were small at the spray periphery.論文(Atticle)departmental bulletin pape
Experiments to Clarify the Problems of High-speed Wireless LAN technology － Impact of Channel bonding and OFDMA on the performance of Wireless LAN －
Get PDFapplication/pdfIn this paper, we clarify the problems in high-speed techniques of wireless LAN, especially in channel bonding (CB) and Orthogonal Frequency Division Multiplexing (OFDM), through an evaluation experiment of communication performance using an actual IEEE802.11ax wireless LAN. Furthermore, we discuss the improvement method of the CB and the OFDMA in IEEE 802.11ax WLAN.論文(Atticle)departmental bulletin pape
Development of the Multicellular Spheroid Formation System for Regenerative Medicine
Get PDFapplication/pdfIn the production of vascular and cardiac cell constructs, the use of the multicellular spheroids with mixture of fibroblasts and endothelial cells has been found to be effective. It is necessary to suppress variation factors that occur from human operation by using automation, improving data accuracy, and obtaining reproducible spheroids. Therefore, the aim of this study was to develop a multicellular spheroid formation system for the fabrication of cell structures for regenerative medicine. As a result of the research, it was found that the multicellular spheroids obtained varied according to the different timing of dispensing.論文(Atticle)departmental bulletin pape
A report on the promotion video production contest between FIT and KMITL - The 1st Cross-Education Project 2020 -
Get PDFapplicationThe 2020 1st cross-education project, which was performed between Fukuoka Institute of technology (FIT) and King Mongkut’s Institute of Technology Ladkrabang (KMITL) Thailand, is reported in this paper. In this project, 10 FIT students and 34 KMITL students participated and created the promotion video for each other’s universities, where the promotional video was produced by a mixed team of Japanese and Thai. Through this project, participating students have acquired communication skills and international understanding.論文(article)othe
Development of High-Thermal-Conductivity Silicon Nitride using Rare-Earth Silicide as Oxygen Getter
Get PDFapplication/pdfThe Silicon Nitride (Si₃N₄) has drawn much attention as electrical substate materials for power module. One of the factors that decrease the thermal conductivity of Si3N4 is phonon scattering caused by the lattice oxygen. Yttrium disilicide (YSi₂) is expected to act as an effective oxygen getter that would actively remove impurity oxygen contained in the raw materials and further added during processing. It was found that the addition of YSi₂ significantly inhibited the phase transformation and densification, which would suggest that YSi₂ effectively acted as an oxygen getter to decrease the SiO₂ content, and hence the amount of the liquid phase. Although the thermal conductivities of gas-pressure sintered Si₃N₄ were improved with increasing the amount of YSi₂, those of reaction-bonded Si₃N₄ were significantly deteriorated due to their much smaller grain size.論文(Atticle)departmental bulletin pape
米国ウイグル強制労働防止法（第117議会H.R.6256）の調査 ―企業倫理の法制度化のあり方の検討へ向けて―
Get PDFapplication/pdf論文(Article)departmental bulletin pape
Ultra-Realistic Japanese Traditional Craft System using Mixed Reality Technology
Get PDFapplication/pdfIn this study, we implemented a ultra-realistic Japanese traditional craft system using mixed reality technology. By using this system, the user can place any traditional craft object on the MR space. When placing a traditional craft object in MR space, the user marks spherical pointers by using the HandRay function. This calculates the center coordinates, distance, and placement angle between the two markers. Furthermore, the traditional craft object is placed in the MR space by calculating the coordinates and distance from the floor to the upper part of the door frame. In the future, in order to realize communication between users and traditional craft dealers, we aim to realize a MR space sharing function by multi-users.論文(Atticle)departmental bulletin pape