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91.
Samith?S.?Herath Akira?Kusumi Yosuke?Note Etsuhisa?Nakamura Akio?Nozawa Shusaku?NomuraEmail author 《Artificial Life and Robotics》2018,23(1):23-27
A respiration–posture feedback system was developed to control breathing involuntarily. A small air chamber placed under a subject’s back deflates and inflates to make a subject’s upper body move vertically while lying on a bed. By regulating the deflation/inflation of the air chamber in synchronization with actual respiration, the subject’s respiration was successfully lengthened and deepened. The modulation of the respiration acted as a physiological sedative for the subject as the heart rate variability index suggested that the subject’s parasympathetic nervous system activity was enhanced. 相似文献
92.
Yoshihiro Hirata Makoto Nakamura Mari Miyamoto Yosuke Tanaka Xu Hong Wang 《Journal of the American Ceramic Society》2006,89(6):1883-1889
The applied pressure and suspension height during consolidation of an aqueous suspension of nanometer-sized particles (24 nm hydroxyapatite, 30 nm SiC, 68 nm 8 mol% yttria-stabilized zirconia, 150 nm Al2 O3 , and 800 nm SiC) were continuously recorded using a pressure filtration apparatus. The packing density decreased when the particle size was less than 70 nm. The final packing density of 150−800 nm particles at 19 MPa was strongly influenced by the surface charge. However, surface charge does not affect the packing density of particles less than 70 nm. The ratio of the energy applied to two particles during consolidation to the interaction energy between two particles in a suspension was correlated to the packing density. The low packing density of 20−30 nm particles was improved by steric stabilization. The estimated thickness of the dispersant layer adsorbed on the particle surfaces was less than 1 nm and nearly independent of the molecular weight of the dispersants. When the applied pressure was released, the height of the consolidated cake increased because of the release of the elastic strain stored in the dispersant layer. 相似文献
93.
Yosuke Matsumoto Ken Hirota Osamu Yamaguchi Suguru Inamura Hiroki Miyamoto Nobuaki Shiokawa Kazuhiro Tsuji 《Journal of the American Ceramic Society》1993,76(10):2677-2680
Amorphous Al2 O3 –ZrO2 composite powders with 5–30 mol% ZrO2 have been prepared by adding aqueous ammonia to the mixed solution of aqueous aluminum sulfate and zirconium alkoxide containing 2-propanol. Simultaneous crystallization of γ-Al2 O3 and t -ZrO2 occurs at 870°–980°C. The γ-Al2 O3 transforms to α-Al2 O3 at 1160°–1220°C. Hot isostatic pressing has been performed for 1 h at 1400°C under 196 MPa using α-Al2 O3 – t -ZrO2 composite powders. Dense ZrO2 -toughened Al2 O3 (ZTA) ceramics with homogeneous-dispersed ZrO2 particles show excellent mechanical properties. The toughening mechanism is discussed. The microstructures and t / m ratios of ZTA are examined, with emphasis on the relation between strength and fracture toughness. 相似文献
94.
The iodine-initiated, solid-state copolymerization of tetraoxane with 1,3-dioxolane in the presence of methylal has been studied on a beaker scale. It was found that tetraoxane can be easily copolymerized with 1,3-dioxolane by a small amount of iodine as initiator and gives oxymethylene copolymer with excellent thermal stability in a high yield. The copolymerization was largely influenced by the concentrations of iodine, 1,3-dioxolane, and methylal, i.e., the polymerization rate increased with increase not only in iodine but also in 1,3-dioxolane, and the thermal stability and the molecular weight of the copolymer were mainly affected by 1,3-dioxolane and methylal concentration, respectively. 相似文献
95.
Yosuke Iwata Mitsuhiro Murata Kohei Tanaka Tadashi Ohtake Hidefumi Yoshida Koichi Miyachi 《Journal of the Society for Information Display》2014,22(1):35-42
We have developed a novel super fast response (SFR) thin‐film transistor liquid crystal display (TFT‐LCD) with an extremely wide temperature range. Nematic liquid crystal molecules with positive dielectric anisotropy are vertically aligned initially. Any gray‐to‐gray response is forcibly controlled by applying an electric field. Response times of the SFR TFT‐LCD are over several times shorter than those of conventional LCDs such as vertical alignment or in‐plane switching LCDs. 相似文献
96.
Shibuya K Koshimizu M Asai K Muroya Y Katsumura Y Inadama N Yoshida E Nishikido F Yamaya T Murayama H 《The Review of scientific instruments》2007,78(8):083303
We introduce experimental systems which use accelerators to evaluate scintillation properties such as scintillation intensity, wavelength, and lifetime. A single crystal of good optical quality is often unavailable during early stages in the research and development (R&D) of new scintillator materials. Because of their beams' high excitation power and/or low penetration depth, accelerators facilitate estimation of the properties of early samples which may only be available as powders, thin films, and very small crystals. We constructed a scintillation spectrum measurement system that uses a Van de Graaff accelerator and an optical multichannel analyzer to estimate the relative scintillation intensity. In addition, we constructed a scintillation time profile measurement system that uses an electron linear accelerator and a femtosecond streak camera or a microchannel plate photomultiplier tube followed by a digital oscilloscope to determine the scintillation lifetimes. The time resolution is approximately 10 ps. The scintillation spectra or time profiles can be obtained in a significantly shorter acquisition time in comparison with that required by conventional measuring systems. The advantages of the systems described in this study can significantly promote the R&D of novel scintillator materials. 相似文献
97.
Yasuhisa Ando Yosuke Inoue Kazuo Kakuta Takashi Igari Shigeyuki Mori 《Tribology Letters》2007,27(1):13-20
The effects of a self-assembled monolayer (SAM) coating on the friction and pull-off forces were determined by using two-dimensional
asperity arrays on silicon wafers. The arrays were coated with SAM composed of one of five different alkylchlorsilanes. First,
two-dimensional asperity arrays were created by using a focussed ion beam (FIB) system to mill patterns on silicon plates.
Each silicon plate had different patterns of equally spaced asperities. Each pattern (5 × 5 μm2) had a different radius of curvature of the asperity peaks, ranging from about 200 to 2500 nm. Then, each silicon plate was
immersed in a solution of a different alkylchlorsilane in hexane (either hexyltrichlorosilane, octyltrichlorosilane, dodecyltrichlorosilane,
tetradecyltrichlorosilane, or octadecyltrichlorosilane), thus coating the asperity arrays with SAM. The friction and pull-off
forces on the SAM-coated arrays were measured by using an atomic force microscope (AFM) that had a square flat probe. The
pull-off force for SAM-coated silicon was roughly proportional to the radius of curvature of the asperity peaks. The magnitude
of the pull-off force corresponded approximately to the capillary force calculated by using the contact angle of water on
the surface of SAM. The friction coefficient correlated with the inverse of the alkyl-chain length of the SAM. 相似文献
98.
99.
100.
Yosuke Kadomae Masataka Sugimoto Takashi Taniguchi Kiyohito Koyama 《Polymer Engineering and Science》2010,50(9):1788-1796
Relations between beads formation and jet profiles, and beads formation and electric discharge during electrospinning were investigated by changing sample parameters and spinning conditions. The jet profiles were obtained as a function of the position along the spinning line by using photographs. As the molecular weight or concentration increased, the elongational viscosity of jet at the onset of bending instability was increased, and beads formation was suppressed. In addition, beads formation was enhanced with increasing voltage. The electric discharge spark from the apex of cone was observed by using image intensified high‐speed camera. It was found that the beads were also formed easily when the electric discharge generated. POLYM. ENG. SCI., 50:1788–1796, 2010. © 2010 Society of Plastics Engineers 相似文献