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31.
Mitsuhiro Hibino Hirokazu Kawaoka Haoshen Zhou Itaru Honma 《Electrochimica acta》2004,49(28):5209-5216
Hydrated sodium manganese oxide was synthesized by reducing permanganate ion using ethanol by a sol–gel method. By including acetylene black in the synthetic reaction, we obtained composite materials in which sodium manganese oxide hydrate particles were small and mixed well with the acetylene black. We evaluated those composites as a lithium battery cathode and found that they showed 170 mA h g−1 under 5 mA g−1 and 117 mA h g−1 under 5 A g−1 on the basis of composite weight. This rapid discharge performance was probably caused by the favorable contact condition of the composite constituents. 相似文献
32.
Itaru Natori Shizue Natori Anna Kanasashi Kosuke Tsuchiya Kenji Ogino 《Reactive and Functional Polymers》2013,73(1):200-206
The synthesis of tetraphenylporphyrin (H2TPP)-end-functionalized poly(p-phenylene) (H2TPP-PPP) as a leaf-green-colored soluble semiconducting polymer with a well-controlled and defined polymer chain structure was achieved for the first time. Chloromethyl-end-functionalized poly(1,3-cyclohexadiene) (CM-PCHD) was prepared by the living anionic polymerization of 1,3-cyclohexadiene and the post-polymerization reaction of poly(1,3-cyclohexadienyl)lithium and chloro(chloromethyl)dimethylsilane. H2TPP-end-functionalized PCHD (H2TPP-PCHD) was then prepared by the addition of 5-(4-hydroxyphenyl)-10,15,20-triphenylporphyrin to CM-PCHD. The dehydrogenation of H2TPP-PCHD with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone was performed under ultrasonic irradiation, and H2TPP-PPP was obtained as a target polymer in almost quantitative yield. The –Si(CH3)2–CH2–O– bond in H2TPP-PPP effectively inhibited the coordination of the H2TPP end-group onto the PPP moiety, and the aggregation of H2TPP-PPP with the accumulation of the H2TPP end-group was formed. H2TPP-PPP exhibited a leaf-green color and had a very broad absorption band overlapping the visible-light region, similar to chlorophyll a. 相似文献
33.
A. Maeda K. Kinoshita Y. Inoue H. Kitano T. Nishizaki T. Sato K. Shibata N. Kobayashi 《Journal of Low Temperature Physics》2003,131(5-6):969-973
We investigated the microwave surface impedance in Zn doped YBa2Cu3O
y
. For low Zn concentrations, crossover frequency
p
and viscosity of vortex do not change significantly (at maximum, factor of 2). This is in sharp contrast to the dramatic change in the zero-field quasiparticle scattering time. The robust nature of viscosity on the impurity doping suggests that the quasiparticle scattering time in the vortex core is determined by a different mechanism from that outside the core. 相似文献
34.
T Ashikaga M Nishizaki M Arita N Yamawake Y Kishi F Numano M Hiraoka 《Canadian Metallurgical Quarterly》1998,82(6):814-6, A10
This study found that increased QT dispersion just before angioplasty is an useful marker to predict the risk for lethal ventricular arrhythmias during angioplasty. The fact that successful coronary revascularization decreased QT dispersion suggested that a part of increased QT dispersion is related to myocardial ischemia. 相似文献
35.
Yuichi Yamasaki Harumi Asami Takashi Isoshima Itaru Kamiya Masahiko Hara 《Science and Technology of Advanced Materials》2013,14(6):519-522
A single chromophore detection using video-microscopy is one of the latest methodologies to reveal unique characteristics, which could not be obtained from ensemble measurements. Among many kinds of subjects, dynamic optical properties observed in colloidal semiconductor nanoparticles are attractive and important not only for the basis of photo-physics but also for application studies, e.g. biological labeling, electronic devices. In this study, fluorescence video-microscopy was performed on cadmium selenide (CdSe) quantum dots (QDs) spin-coated on a glass substrate. From single CdSe QDs detection, emissions at wavelengths separated over 60 nm were observed for the first time. This spectral feature was attributed to the existence of double-emissive relaxation processes in CdSe QDs. Photoluminescence intermittency was also observed both from relaxation processes. Fluorescence video-microscopy, which was advanced in biology, can be applicable for the real-time monitoring of dynamic properties in semiconductor photo-physics. 相似文献
36.
37.
Keisuke Ohdaira Yuki Abe Shogo Nishizaki Kazuo Nakajima Tetsuya Torikai 《Thin solid films》2008,516(5):600-603
Polycrystalline silicon (poly-Si) films thicker than 1.5 μm, consisting of dense small grains called nano-grain poly-Si (ngp-Si), are formed by flash lamp annealing (FLA) of amorphous silicon (a-Si) films prepared by catalytic chemical vapor deposition (Cat-CVD) method. Crystallinity of the ngp-Si films can be controlled by changing lamp irradiance. Secondary ion mass spectroscopy (SIMS) profiles of dopants in the ngp-Si films after FLA shows no serious diffusion. A minority carrier lifetime of over 5 μs is observed from these ngp-Si films after defect termination process using high pressure water vapor annealing (HPWVA), showing possibility of application for high-efficient thin film solar cells. 相似文献
38.
Thermal and electrical conduction properties of vertically aligned carbon nanotubes produced by water-assisted chemical vapor deposition 总被引:1,自引:0,他引:1
Atsuto Okamoto Itaru Gunjishima Takashi Inoue Megumi Akoshima Hidenori Miyagawa Tomohito Nakano Tetsuya Baba Masaki Tanemura Gendo Oomi 《Carbon》2011,(1):294-298
We present both thermal and electrical conduction properties of vertically aligned carbon nanotubes (VACNTs), synthesized by the water-assisted chemical vapor deposition method using Fe–Ti–O nanoparticles as catalyst. Thermal diffusivity and electrical resistance of VACNTs have been measured by the laser flash method and direct-current four-terminal method, respectively. The VACNTs are found to have thermal diffusivities of the same order as isotropic graphite and the electrical characteristics of semiconductors. The electrical resistance shows a T−1/4 temperature dependence, which implies that the conduction of electrons is dominated by 3D Mott variable range hopping. 相似文献
39.
Yohei Iizawa Soichiro Araki Shinya Ishida Itaru Nishioka Kohei Shimada Hiroshi Hasegawa Ken-ichi Sato 《Optical Switching and Networking》2013,10(1):32-43
We discuss issues for controlling an optical path in large-scale photonic networks, and introduce an inter-domain path control system based on Path Computation Elements (PCEs). In the system, maximum flow information enables the load balancing of traffic, and Path Key scheme preserve the confidentiality of internal topology information among carrier networks. Based on the experimental results, we show the path setup in the introduced system is significantly faster than the manual path setup among domains in current carriers' networks. For the additional reduction of the path setup time, we propose the domain-wise paralleled signaling method. We also show that decreasing the number of nodes per domain makes path setup faster in the introduced system with deployment of the proposed signaling method. 相似文献
40.
Keisuke Ohdaira Kazuhiro Shiba Hiroyuki Takemoto Tomoko Fujiwara Yohei Endo Shogo Nishizaki Young Rae Jang Hideki Matsumura 《Thin solid films》2009,517(12):3472-4461
Amorphous Si (a-Si) films with lower hydrogen contents show better adhesion to glass during flash lamp annealing (FLA). The 2.0 µm-thick a-Si films deposited by plasma-enhanced chemical vapor deposition (PECVD), containing 10% hydrogen, start to peel off even at a lamp irradiance lower than that required for crystallization, whereas a-Si films deposited by catalytic CVD (Cat-CVD) partially adhere even after crystallization. Dehydrogenated Cat-CVD a-Si films show much better adhesion to glass, and are converted to polycrystalline Si (poly-Si) without serious peeling, but are accompanied by the generation of crack-like structures. These facts demonstrate the superiority of as-deposited Cat-CVD a-Si films as a precursor material for micrometer-thick poly-Si formed by FLA. 相似文献