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SiC nanowires formed by high energy ion beam irradiation to polymer films and heating
Satoshi Tsukuda,Shu Seki,Masaki Sugimoto,Seiichi Tagawa,Shun-Ichiro Tanaka 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.5
Ion bombardment can release densely active intermediates within a cylindrical area along the passage of a single ion. The cylindrical area, in which high-energy is deposited from projectile ion, is sometimes called an “ion track”. The high energy charged particle irradiation of a polycarbosilane (PCS) film causes cross-linking reactions, leading to the formation of a polymer gel containing cylindrical nanostructures (nanowires). The diameter and length of the nanowires were completely controlled by changing several parameters. PCS is also a well-known a precursor of silicon carbide (SiC), and the PCS nanowires formed by the present techniques were heated at 1,000 oC in Ar gas. A SiC ceramic wire, which has a higher heat resistance than polymers, was obtained on a Si substrate by conversion from the PCS nanowires. In this paper, the crystal structure and phase of the SiC nanowires obtained are discussed. Ion bombardment can release densely active intermediates within a cylindrical area along the passage of a single ion. The cylindrical area, in which high-energy is deposited from projectile ion, is sometimes called an “ion track”. The high energy charged particle irradiation of a polycarbosilane (PCS) film causes cross-linking reactions, leading to the formation of a polymer gel containing cylindrical nanostructures (nanowires). The diameter and length of the nanowires were completely controlled by changing several parameters. PCS is also a well-known a precursor of silicon carbide (SiC), and the PCS nanowires formed by the present techniques were heated at 1,000 oC in Ar gas. A SiC ceramic wire, which has a higher heat resistance than polymers, was obtained on a Si substrate by conversion from the PCS nanowires. In this paper, the crystal structure and phase of the SiC nanowires obtained are discussed.
Seismic response analysis of an oil storage tank using Lagrangian fluid elements
Nagashima, Toshio,Tsukuda, Takenari Techno-Press 2013 Coupled systems mechanics Vol.2 No.4
Three-dimensional Lagrangian fluid finite element is applied to seismic response analysis of an oil storage tank with a floating roof. The fluid element utilized in the present analysis is formulated based on the displacement finite element method considering only volumetric elasticity and its element stiffness matrix is derived by using one-point integration method in order to avoid volumetric locking. The method usually adds a rotational penalty stiffness to satisfy the irrotational condition for fluid motion and modifies element mass matrices through the projected mass method to suppress spurious hourglass-mode appeared in compensation for one-point integration. In the fluid element utilized in the present paper, a small hourglass stiffness is employed. The fluid and structure domains for the objective oil storage tank are modeled by eight-node solid elements and four-node shell elements, respectively, and the transient response of the floating roof structure or the free surface are evaluated by implicit direct time integration method. The results of seismic response analyses are compared with those by other method and the validation of the present analysis using three-dimensional Lagrangian fluid finite elements is shown.
Effects of π‐Electron Systems on Optical Activity of Au11 Clusters Protected by Chiral Diphosphines
Shinjo Naoaki,Takano Shinjiro,Tsukuda Tatsuya 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.9
We systematically examined the effects of π-electron systems on the chiroptical activity of atomically precise gold clusters [Au11(DP)4L2] +, where DP and L represent chiral diphosphines and achiral anionic ligands, respectively. Reducing the distance between the π-electron systems of the chiral DP and the Au11 core enhanced the anisotropy factor of [Au11(DP)4L2] + in the range of 300–450 nm while extension of the π-electron system of the achiral L did not. This tendency supports our previous proposal that the proximity of the chiral π-electron system to the gold core amplifies the optical activity
Daisuke YUKI,Hyoungseop KIM,Joo Kooi TAN,Seiji ISHIKAWA,Masanori TSUKUDA,Ichiro OMURA 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
Recently, the necessity of environmental regulation, low fuel consumption, and natural energy development is proposed by environmental issues. So the demands of power transistor devices are increased. But measurement technique of the current distribution is not keeping up with further miniaturized and integrated were needed in present condition. Now, therefore, ensuring security attended high functionalization is a subject. IGBT (Insulated Gate Bipolar Transistor) is the device that used for wide range of power devices. So we are developing imaging system used non-contact sensor arrays aimed to IGBT production line. In this paper, we propose a development of a supporting system for visual inspection IGBT device based on statistical feature and complex multi-resolution analysis. First, this performs signal de-noising after entering well-known good data and measured data. Second, the statistical feature is expressed the difference between good data and measured data are calculated. Last, classifying of good and inferiority is performed based on the result of threshold processing. In the paper, we applied our algorithm to 28 sample data including 20 good data and 8 inferiority data.