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Journal Articles

Numerical simulation on molten metal collision behavior using SPH method combined with fractal analysis on morphology of stacking pattern

Futakawa, Masatoshi; Tsutsui, Kihei*; Kogawa, Hiroyuki; Naoe, Takashi

Key Engineering Materials, 715, p.203 - 209, 2016/11

The developments of the high power proton accelerators become a worldwide interest to provide various applications, where the targets are demanded to efficiently produce secondary beams and to survive intensive MW class proton beam power supplied by the accelerators. Solid metal targets might be melted by very high heat flux that is caused by the proton beam bombardment. In fact, the incident occurred at J-PARC, in which the gold solid target was locally melted to explosively jet molten gold. The jet collided with a structural beryllium flange plate that has a function of vacuum boundary. Some parts of gold were splashed and the other stuck on the flange plate. The relationship between the impact velocity and the morphology of the sticking pattern on the plate was quantitatively evaluated by introducing fractal analysis. It was found that the fractal dimension is correlated with the impact velocity and might be a useful factor to indicate the localized impact force and behavior.

Journal Articles

Fabrication of microstructures embedded in SC-CVD diamond with a focused proton microbeam

Kada, Wataru*; Kambayashi, Yuya*; Miura, Kenta*; Saruya, Ryota*; Kubota, Atsushi*; Sato, Takahiro; Koka, Masashi; Kamiya, Tomihiro; Hanaizumi, Osamu*

Key Engineering Materials, 643, p.15 - 19, 2015/05

Journal Articles

Fabrication of Mach-Zehnder polimer waveguides by a direct-drawing technique using a focused proton beam

Miura, Kenta*; Sato, Takahiro; Ishii, Yasuyuki; Kiryu, Hiromu*; Ozawa, Yusuke*; Koka, Masashi; Takano, Katsuyoshi*; Okubo, Takeru; Yamazaki, Akiyoshi; Kada, Wataru; et al.

Key Engineering Materials, 534, p.158 - 161, 2013/00

 Times Cited Count:5 Percentile:92.66

Journal Articles

Fabrication of polymer optical waveguides for the 1.5-$$mu$$m band using focused proton beam

Miura, Kenta*; Machida, Yuki*; Uehara, Masato*; Kiryu, Hiromu*; Ozawa, Yusuke*; Sasaki, Tomoyuki*; Hanaizumi, Osamu*; Sato, Takahiro; Ishii, Yasuyuki; Koka, Masashi; et al.

Key Engineering Materials, 497, p.147 - 150, 2012/00

 Times Cited Count:7 Percentile:96.61

Journal Articles

Fabrication of polymer optical waveguides for the 1.5-$$mu$$m band using focused proton beam

Miura, Kenta*; Machida, Yuki*; Uehara, Masato*; Kiryu, Hiromu*; Ozawa, Yusuke*; Sasaki, Tomoyuki*; Hanaizumi, Osamu*; Sato, Takahiro; Ishii, Yasuyuki; Koka, Masashi; et al.

Key Engineering Materials, 497, p.147 - 150, 2011/12

 Times Cited Count:6 Percentile:2.48

Journal Articles

Design and fabrication of novel photonic crystal waveguide consisting of Si-ion implanted SiO$$_{2}$$ layers

Umenyi, A. V.*; Hommi, Masashi*; Kawashiri, Shinya*; Shinagawa, Teruyoshi*; Miura, Kenta*; Hanaizumi, Osamu*; Yamamoto, Shunya; Inoue, Aichi; Yoshikawa, Masahito

Key Engineering Materials, 459, p.168 - 172, 2011/04

A new type of two-dimensional photonic crystal (2-D PhC) waveguide was designed using finite difference time domain method to operate at a wavelength of 1.55 $$mu$$m applicable to optical fiber-communication systems. We estimated that a triangular-lattice 2-D PhC structure formed by air holes with a diameter of 465 nm and a period of 664 nm suit our purpose. To form a core of the waveguide, Si ions were implanted into a SiO$$_{2}$$ layer by using a 400-kV ion implanter. The implantation energy was 80 keV and the implantation amount was 1$$times$$10$$^{17}$$ ions/cm$$^{2}$$. The electron beam resist was spin-coated on a substrate and the designed pattern was written lithographically in the resist using Electron Beam. Atomic force microscope measurements revealed that the diameter and the period of air holes of the waveguide were 466 and 666 nm. These values were nearly equal to the designed ones. We thus succeeded in fabricating 2-D PhC waveguides in a Si-ion-implanted SiO$$_{2}$$ layer.

Journal Articles

Component-wise meshing approach and evaluation of bonding strategy on the interface of components for assembled finite element analysis of structures

Yamada, Tomonori; Kushida, Noriyuki; Araya, Fumimasa; Nishida, Akemi; Nakajima, Norihiro

Key Engineering Materials, 452-453, p.701 - 704, 2011/01

The paper describes a component-wise meshing approach and bonding strategy on the interface of components. In order to assemble component-wise meshes, the penalty method is introduced not only to constrain the displacements, but also to introduce classical spring connection on the joint interface. The convergence performance of an iterative solver with penalty method is investigated and the detailed component-wise distributed computation scheme is described with numerical examples.

Journal Articles

Thermosensitive micelles composed of poly(lactide)-$$g$$-poly(NIPAM-$$co$$-HEMA) graft copolymers

Quynh, T. M.*; Yoneyama, Masaru*; Maki, Yasuyuki*; Nagasawa, Naotsugu; Dobashi, Toshiaki*

Key Engineering Materials, 459, p.51 - 56, 2010/12

 Times Cited Count:3 Percentile:85.69

Different poly(${it N}$-isopropylacrylamide-${it co}$-hydroxyethyl methacrylate) copolymers [P(NIPAM-${it co}$-HEMA)] were synthesized from ${it N}$-isopropylacrylamide (NIPA) and hydroxyethyl methacrylate (HEMA) monomers by both radical and radiation polymerizations for comparison. PLLA-${it g}$-P(NIPAM-${it co}$-HEMA) graft copolymers were synthesized from L-lactide and respective P(NIPAM-${it co}$-HEMA) copolymers by ring opening polymerization. Both NMR and FTIR analyses demonstrated the PLLA chains have been grafted on to the P(NIPAM-${it co}$-HEMA) backbone. These graft copolymers revealed the cloud point temperature higher than that of PNIPAM homopolymer as determined by optical transmittance. The graft copolymers self-assembled into micelles with regularly spherical structures as observed by atomic force microscopy (AFM). The properties of these graft copolymers are interesting for the drug delivery system.

Journal Articles

Growth and characterization of bismuth magnesium titanate Bi(Mg$$_{1/2}$$Ti$$_{1/2}$$)0$$_3$$

Yoneda, Yasuhiro; Saito, Hiroyuki; Yoshii, Kenji; Nishida, Takashi*; Hayakawa, Hironori*; Ikeda, Naoshi*

Key Engineering Materials, 421-422, p.30 - 33, 2010/00

Polycrystalline Bi(Mg$$_{1/2}$$Ti$$_{1/2}$$)O$$_3$$ samples were prepared under high pressure. A mixed powder of Bi$$_2$$O$$_3$$, Ti$$_2$$O$$_3$$ and MgO with a prescribed ratio was packed into platinum cell and was heated a cubic anvil-type apparatus at 6.5 GPa and 1000 $$^circ$$C. The obtained samples were characterized by powder X-ray diffraction measurements. Although some impurity peaks existed, the main peaks were perovskite peaks. The structure of Bi(Mg$$_{1/2}$$Ti$$_{1/2}$$)O$$_3$$ is rhombohedral, as well as BiFeO$$_3$$. The D-E hysteresis loop was not saturated due to the impurities, but the possibility as ferroelectric can be expected enough.

Journal Articles

Development of silicon carbide coating on Al$$_{2}$$O$$_{3}$$ ceramics from precursor polymers by radiation curing

Wach, R.; Sugimoto, Masaki; Yoshikawa, Masahito

Key Engineering Materials, 317-318, p.573 - 576, 2006/08

no abstracts in English

Journal Articles

The Intelligent catalyst; Pd-perovskite having the self-regenerative function in a wide temperature range

Tanaka, Hirohisa*; Tan, Isao*; Uenishi, Mari*; Taniguchi, Masashi*; Nishihata, Yasuo; Mizuki, Junichiro

Key Engineering Materials, 317-318, p.827 - 832, 2006/08

no abstracts in English

Journal Articles

The Self-regenerative "intelligent" catalyst for automotive emissions control

Tan, Isao*; Taniguchi, Masashi*; Tanaka, Hirohisa*; Uenishi, Mari*; Kajita, Nobuhiko*; Nishihata, Yasuo; Mizuki, Junichiro; Niihara, Koichi*

Key Engineering Materials, 317-318, p.833 - 836, 2006/08

no abstracts in English

Journal Articles

Basic concept on structural design criteria for zirconia ceramics applying to nuclear components

Shibata, Taiju; Sumita, Junya; Baba, Shinichi; Yamaji, Masatoshi*; Ishihara, Masahiro; Iyoku, Tatsuo; Tsuji, Nobumasa*

Key Engineering Materials, 297-300, p.728 - 733, 2005/11

no abstracts in English

Journal Articles

Anisotropic deformation effect on the fracture of core components made of two-dimensional C/C composite

Sumita, Junya; Shibata, Taiju; Ishihara, Masahiro; Iyoku, Tatsuo; Tsuji, Nobumasa*

Key Engineering Materials, 297-300, p.143 - 147, 2005/11

no abstracts in English

Journal Articles

Annealing effect of thermal conductivity on thermal stress induced fracture of nuclear graphite

Sumita, Junya; Shibata, Taiju; Ishihara, Masahiro; Iyoku, Tatsuo; Tsuji, Nobumasa*

Key Engineering Materials, 297-300, p.1698 - 1703, 2005/11

no abstracts in English

Journal Articles

Analytical study on biaxial strength of structural ceramics under tension-compression condition

Hanawa, Satoshi; Ishihara, Masahiro; Motohashi, Yoshinobu*

Key Engineering Materials, 297-300, p.40 - 46, 2005/11

no abstracts in English

Journal Articles

Buckling fracture of two-dimensional carbon-fiber reinforced carbon-matrix composite

Ishihara, Masahiro; Yamaji, Masatoshi*; Baba, Shinichi; Hanawa, Satoshi

Key Engineering Materials, 297-300, p.201 - 206, 2005/11

no abstracts in English

Journal Articles

Radiation curing of polyvinylsilane as a precursor for SiC-based material

Idesaki, Akira; Sugimoto, Masaki; Tanaka, Shigeru; Narisawa, Masaki*; Okamura, Kiyohito*; Ito, Masayoshi*

Key Engineering Materials, 247, p.129 - 132, 2003/00

Polyvinylsilane (PVS), a liquid organosilicon polymer at room temperature, is expected to be used as a precursor for SiC product with minute and complex shape. In the synthesis of the SiC product, it is necessary to cure the polymer in order to retain the shape during the pyrolysis. We have used a radiation for curing of the PVS. However, there is a problem that the PVS foams during electron beam irradiation at room temperature. In this report, the curing of PVS by $$gamma$$-ray irradiation was examined, and effect of irradiation temperature was studied in order to find out conditions that prevent the foaming of PVS. It was found that the PVS is cured without foaming by the $$gamma$$-ray irradiation in both cases of the irradiation temperature at liquid nitrogen temperature (77K) and at room temperature. From the results of measurement of gel fraction and TGA, it was found that the PVS is cured more efficiently by the irradiation at room temperature than at 77K.

Journal Articles

Development of silicon carbide micro-tube from precursor polymer by radiation oxidation

Sugimoto, Masaki; Idesaki, Akira; Tanaka, Shigeru; Okamura, Kiyohito*

Key Engineering Materials, 247, p.133 - 136, 2003/00

no abstracts in English

Journal Articles

Synthesis of SiC-based fibers derived from hybrid polymer of polycarbosilane and polyvinylsilane

Idesaki, Akira*; Narisawa, Masaki*; *; Sugimoto, Masaki; Seguchi, Tadao; Ito, Masayoshi*

Key Engineering Materials, 159-160, p.107 - 111, 1999/00

no abstracts in English

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