Edgar F. Westrum, Yoichi Takahashi, N.D. Stout,
... 5 to 350°K.1Edgar F. Westrum Jr., Yoichi Takahashi, and Norman D. StoutCite this: J. Phys. Chem. ...
Tópico(s): Rocket and propulsion systems research
1965 - American Chemical Society | The Journal of Physical Chemistry
Edgar F. Westrum, Yoichi Takahashi, Fredrik Grønvold,
... Enneaoxide at 348°K.Edgar F. Westrum Jr., Yoichi Takahashi, and Fredrik GrønvoldCite this: J. Phys. Chem. 1965, ...
Tópico(s): History and advancements in chemistry
1965 - American Chemical Society | The Journal of Physical Chemistry
Yoichi Takahashi, Edgar F. Westrum,
... and Thermodynamic Properties from 5° to 350° K.Yoichi Takahashi and E. F. Westrum Jr.Cite this: J. ...
Tópico(s): Chemical and Physical Properties in Aqueous Solutions
1965 - American Chemical Society | Journal of Chemical & Engineering Data
Yoichi Takahashi, Edgar F. Westrum, R. A. Kent,
... RETURN TO ISSUEPREVArticleNEXTThorium Dicarbide-Low Temperature Thermodynamic Properties.Yoichi Takahashi, E. F. Westrum Jr., and R. A. KentCite ...
Tópico(s): Energetic Materials and Combustion
1965 - American Chemical Society | Journal of Chemical & Engineering Data
Hikaru Yanai, Ryuta Takahashi, Yoichi Takahashi, A. Kotani, Hideki Hakamata, Takashi Matsumoto,
On mixing (Rf SO2 )2 CH2 (Rf =perfluoroalkyl), paraformaldehyde, and substituted pyridines, a three-component reaction proceeded smoothly to give unusual zwitterions bearing both pyridinium and stabilized carbanion moieties in good to excellent yields. Of these, 2-fluoropyridinium derivatives rapidly dissociated in acetonitrile to give equilibrium mixtures of the zwitterions and (Rf SO2 )2 C=CH2 /2-fluoropyridine, as confirmed by detailed variable-temperature NMR studies. The dynamic behavior of such 2- ...
Tópico(s): Cyclopropane Reaction Mechanisms
2017 - Wiley | Chemistry - A European Journal
Naoya Ogata, Kohei Sanui, Kiyoshi Oguchi, Tomihiro Nakada, Yoichi Takahashi,
... JapanSearch for more papers by this authorYoichi Takahashi, Yoichi Takahashi Dai Nippon Printing Co. Ltd., 1500 Fukuoka Kamifukuoka- ... JapanSearch for more papers by this authorYoichi Takahashi, Yoichi Takahashi Dai Nippon Printing Co. Ltd., 1500 Fukuoka Kamifukuoka- ...
Tópico(s): Copper Interconnects and Reliability
1983 - Wiley | Journal of Applied Polymer Science
Hideki Kakimoto, Takefumi Arikawa, Yoichi Takahashi, Tatsuya Tanaka, Yutaka Imaida,
In this study, the closing behavior of internal voids was examined by a deformation analysis involving the 2-D finite element method (FEM), which simulates voids in steel ingots in the compression process (upset process). In the compression process, a model experiment that uses internal voids was carried out to confirm the accuracy of the deformation analysis. By comparing the model experiment with the analytical results, it was confirmed to simulate the internal void behavior by this analysis. The ...
Tópico(s): Aluminum Alloy Microstructure Properties
2009 - Elsevier BV | Journal of Materials Processing Technology
Hikaru Yanai, Yoichi Takahashi, Haruhiko Fukaya, Yasuo Dobashi, Takashi Matsumoto,
Stable and easy-to-handle zwitterions containing carbanion and pyridinium moieties were synthesized, and their structural studies by both X-ray crystallography and theoretical methods revealed the stereoelectronic effect in the zwitterionic 'C−–C–N+' system.
Tópico(s): Organic and Inorganic Chemical Reactions
2013 - Royal Society of Chemistry | Chemical Communications
Muka Moriyama, Kyoko Ohno‐Matsui, Toshio Modegi, Junichi Kondo, Yoichi Takahashi, Makoto Tomita, Takashi Tokoro, Ikuo Morita,
We analyzed the symmetry and pointedness of the posterior segment of highly myopic eyes.We studied 234 eyes of 117 patients with bilateral high myopia (refractive error ≤-8.00 diopters [D]) and 40 eyes of 20 patients with emmetropia (refractive error between -1.0 and +1.0 D). Volume renderings of high-resolution magnetic resonance (MR) images were performed to obtain 3D images of the eye. To analyze the symmetry and pointedness of the posterior surface, a software was developed to measure the area and angle ...
Tópico(s): Glaucoma and retinal disorders
2012 - Cadmus Press | Investigative Ophthalmology & Visual Science
Hideyuki Sawada, Yoichi Takahashi, Sou Miyata, Shinji Kanehashi, Shūichi Satō, Kazukiyo Nagai,
Gas transport properties (i.e., permeability, diffusivity, and solubility) and the crystallinity/crystalline structure of poly(lactic acid) (PLA) membranes were systematically investigated. PLA membranes with different crystalline structures were prepared by regulating the heating and cooling conditions during their membrane preparation. The PLA membrane that was thermally-treated at 70°C was amorphous, while the membrane heated at higher than 80°C had crystalline structures. As the treatment temperature ...
Tópico(s): Membrane Separation Technologies
2010 - Materials Research Society of Japan | Transactions of the Materials Research Society of Japan
Rika Matsumoto, Noboru Akuzawa, Yoichi Takahashi,
The thermoelectric properties of cesium–graphite intercalation compounds (Cs-GICs) and some other GICs were studied. The electrical conductivities of the Cs-GICs prepared from Grafoil were around 106 Ω−1 m−1, about 10 times higher than that of the host graphite, and the thermal conductivities were 50–100 Wm−1 K−1, about 1/4–1/2 of that of the host graphite. While the Seebeck coefficient of the host graphite was nearly zero, those of the Cs-GICs were found to be around −30 μV K−1. These properties ...
Tópico(s): Advanced Thermoelectric Materials and Devices
2006 - | MATERIALS TRANSACTIONS
Akemi Sugita, Toshiyuki Yanagisawa, Tsutomu Kamo, Yoichi Takahashi, Nobuhiro Yuki,
Tópico(s): Pharmacological Effects of Natural Compounds
2002 - Springer Science+Business Media | Journal of Neurology
Natsuko Sakai, Takuya Hashimoto, Tomoyuki Katsube, Katsuhiko Yamaji, Hideyuki Negishi, Teruhisa Horita, Harumi Yokokawa, Yue Ping Xiong, Megumi Nakagawa, Yoichi Takahashi,
To detect miscibility gap in [(CeO2)x(ZrO2)1−x]0.8(YO1.5)0.2 (x=0–1), powders prepared by liquid-mixing method were investigated by conventional X-ray diffraction (NXRD) and Synchrotron X-ray diffraction (SXRD). The NXRD pattern of the samples, calcined at 873 K, exhibited a broadened cubic structure without any secondary phases. The lattice constants or samples annealed at different temperatures were determined, and they show linear dependence on cerium content (x) except for 1273 K, which indicates ...
Tópico(s): Catalysis and Oxidation Reactions
2001 - Elsevier BV | Solid State Ionics
Masahiro Horiuchi, Tsutomu Kamo, Hiroshi Sugihara, Koshiro Fujisawa, Yoichi Takahashi, Ritsuko Ikeda, Hiroyuki Morishima, Yoshitaro Yamaguchi,
A 27-year-old man with congenital external carotid-jugular arteriovenous fistula presented with a diminished level of consciousness and an ataxic gait. Axial fluid-attenuated inversion-recovery (FLAIR) MR imaging revealed venous congestion, a dilated right jugular vein, and an area of high signal intensity in the brain stem and cerebellum. Angiography showed a dilated right external carotid artery and jugular vein and the presence of a fistula. After coil embolization of the fistula, axial MR FLAIR ...
Tópico(s): Cerebral Venous Sinus Thrombosis
2001 - American Society of Neuroradiology | American Journal of Neuroradiology
Yukio Ando, Motoi Satake, Yoichi Takahashi,
Positional distribution of fatty acids in triacyl-sn-glycerols of docosahexaenoic acid (DHA)-rich tuna orbital and bonito head oils has been reanalyzed by a method based on chromatographic separation of isomeric and enantiomeric monoacyl-sn-glycerol (MAG) derivatives. When boric acid thin-layer chromatography (TLC) was used for separation of 1(3)- and 2-MAG analytical intermediates, the stereospecific analysis showed the preferential association of DHA to the sn-2 position followed by the sn-3 position. ...
Tópico(s): Biochemical Analysis and Sensing Techniques
2000 - Wiley | Lipids
Toshiaki Yoneoka, Takayuki Terai, Yoichi Takahashi,
Yttrium sesquioxide has been proposed as a promising candidate material for collector electrodes used in the laser enrichment system of uranium-235. For this purpose, yttria is expected to be compatible with molten uranium and electrically conductive. A corrosion test of yttria with molten lanthanum as a simulating metal for uranium and a measurement of its electrical conductivity under extremely low oxygen pressure were performed. It was shown from the corrosion test that a yttria sample was considerably ...
Tópico(s): Fusion materials and technologies
1997 - Elsevier BV | Journal of Nuclear Materials
Takayuki Terai, Yoichi Takahashi, Shinya Masumura, Toshiaki Yoneoka,
Heat capacity from 300 K to 1100 K and enthalpy change of the phase transition of Zircaloy-4 between 1080 K and 1270 K were measured with a triple-cell-type differential scanning calorimeter and a twin-type drop calorimeter. Heat capacities measured with these two apparatuses were in good agreement with each other, and they were several % less than the other literature values. They were also in good agreement with the values calculated by assuming the additivity of the contributions of the elements ...
Tópico(s): Thermodynamic and Structural Properties of Metals and Alloys
1997 - Elsevier BV | Journal of Nuclear Materials
Tomoya Asaka, Eishun Nitta, Takao Makifuchi, Yoichi Shibazaki, Yoshihisa Kitamura, Hiroyasu Ohara, Kazuhiko Matsushita, Masaharu Takamori, Yoichi Takahashi, Akira Genda,
Sensory ataxia in inorganic germanium intoxication is rare. A 63-year-old housewife had taken inorganic germanium preparations at a dosage of 36 mg a day for about 6 years (total dose about 80 g). She subsequently developed difficulty in writing and gait disturbance with peripheral neuropathy and renal involvement. Germanium, which is not usually detected in the non-germanium user, was accumulated in her hair and nails, permitting a diagnosis of inorganic germanium intoxication. The peripheral neuropathy ...
Tópico(s): Aluminum toxicity and tolerance in plants and animals
1995 - Elsevier BV | Journal of the Neurological Sciences
Yoichi Takahashi, Masami Asou,
A new differential scanning calorimeter (DSC) for heat capacity measurements up to 1500 K has been developed. In order to overcome difficulties encountered in high-temperature heat capacity measurements with conventional DSC equipment, two new concepts were adopted for the design of this apparatus: a "triple-cell" system and triple-adiabatic temperature control. The heat capacities of Mo, Pt and UO2 were determined from 300 to 1500 K to test the new apparatus. The heat capacities of Ni and Ti, which ...
Tópico(s): Thermodynamic and Structural Properties of Metals and Alloys
1993 - Elsevier BV | Thermochimica Acta
Yoichi Takahashi, Masami Asou,
Heat capacities of U1−xGdxO2 (x ≤ 0.142) were determined from 400 to 1000 K by drop calorimetry, and also from 400 to 1500 K by differential scanning calorimetry (DSC). The reliability of the heat-capacity measurements by the two methods was confirmed by the measurements on UO2, the results being consistent with the published values within experimental uncertainty over the temperature range of the measurements. In the heat capacities of U1−xGdxO2(x ≤ 0.142), no thermal anomalies were observed. Their heat- ...
Tópico(s): Nuclear reactor physics and engineering
1993 - Elsevier BV | Journal of Nuclear Materials
Takayuki Terai, Shin'ichi Nagai, Toshiaki Yoneoka, Yoichi Takahashi,
The diffusion coefficient of tritium in molten Li17Pb83 alloy was determined under neutron irradiation at 300–700°C. Tritium residence time in the experimental system decreased with increasing H2 pressure in He sweep gas up to 1000 Pa, and above this limiting concentration it became constant. This result suggests that the tritium release rate was controlled only by the tritium diffusion processes in the molten Li17Pb83 alloy sample and in the Fe sample holder above PH2 = 1000 Pa. From the data on ...
Tópico(s): Nuclear reactor physics and engineering
1992 - Elsevier BV | Journal of Nuclear Materials
Takayuki Terai, Shin'ichi Nagai, Yoichi Takahashi,
An in situ tritium release experiment from molten Li17Pb83 alloy was performed under neutron irradiation at 300–700 °C to investigate the chemical form and release rate of tritium. The dominant chemical form of the released tritium ( > 99.9%) from fresh Li17Pb83 was the water-insoluble component (HT, T2), irrespective of the H2 concentration in He carrier gas (0, 100, 1000, 10000 ppm). After 10 runs, however, the fraction of the water-insoluble component decreased considerably, and depended strongly upon ...
Tópico(s): Nuclear Materials and Properties
1991 - Elsevier BV | Journal of Nuclear Materials
Takayuki Terai, Tamaki Masegi, Kazuyuki Kusagaya, Yoichi Takahashi, K. Kishio, N. Motohira, Koichi Nakatani,
Effect of 28 MeV electron irradiation was investigated on the critical current density (Jc) of high-Tc superconductor Bi2Sr2CaCu2Oy single crystal grown by floating zone method. For the single crystal sample irradiated with a fluence between 3.4 × 1017 cm−2 and 2.3 × 1018 cm−2, Jc was enhanced at temperatures from 4.2 to 40 K below 8 T in magnetic field parallel to c-axis of the crystal. Enhancement ratio in Jc by irradiation increased with increasing fluence below 40 K, while at 60 K it has a maximum ...
Tópico(s): Superconducting Materials and Applications
1991 - Elsevier BV | Physica C Superconductivity
Takayuki Terai, Shin'ichi Nagai, Toshiaki Yoneaka, Yoichi Takahashi,
The mass transfer coefficient of tritium from molten Li17Pb83 alloy to environmental gas was determined by in-situ tritium release experiments under neutron irradiation in the temperature range from 400 to 700°C. The tritium residence time in the sample in Al2O3 crucible was measured and a tritium release model was applied to obtain the mass transfer coefficient. The mass transfer coefficient decreased with increasing H2 partial pressure in He sweep gas up to 104 Pa at 600°C, and its maximum value ...
Tópico(s): Molten salt chemistry and electrochemical processes
1991 - Elsevier BV | Fusion Engineering and Design
Masami Asou, Takayuki Terai, Yoichi Takahashi,
Enthalpies and heat capacities of LiAlO2 and Li2SnO3 in the 300–1000 K temperature range have been determined by drop calorimetry. In order to derive heat capacity values precisely from the corresponding enthalpy data, two analytical procedures were used. The heat capacities obtained for LiAlO2 agree well with the published values over the temperature range of the measurements, and are smoothly linked to the low-temperature literature values. The derived heat capacities of Li2SnO3 at 0298.15 K and ...
Tópico(s): Nuclear Materials and Properties
1990 - Elsevier BV | Journal of Nuclear Materials
Takayuki Terai, Tamaki Masegi, Yoichi Takahashi, Youichi Enomoto, Shugo Kubo,
Effect of 28 MeV electron irradiation was investigated on the critical current density ( J c ) of high- T c superconductor Ba 2 YCu 3 O 7-δ thin films. For the film irradiated with a fluence of 4.7×10 16 electrons/cm 2 , J c determined from I - V characteristics at temperatures from 75 to 85 K was enhanced by about 8%. The enhance ratio of J c due to irradiation increased with fluence over the range investigated, while the critical temperature ( T c ) was unchanged. The temperature dependence of J c was not ...
Tópico(s): Magnetic properties of thin films
1990 - Institute of Physics | Japanese Journal of Applied Physics
Kiyoshi Oguchi, Kohei Sanui, Naoya Ogata, Yoichi Takahashi, Tomihiro Nakada,
Abstract Vinyl polymers containing pendant acetal groups were synthesized using (2,2‐dimethyl‐l,3‐dioxolan‐4‐yl)methyl acrylate (DMA) and (2,2‐dimethyl‐l,3‐dioxo‐lan‐4‐yl)methyl methacrylate (DMM), and were evaluated as negative electron beam (EB) resists. It was found that the EB sensitivity of polymers containing acetal groups in the side chain was higher than that of polymers containing acetal groups in the main chain. A high sensitivity of 3.6 × 10 −8 C/cm 2 was observed. Copolymers of DMA or DMM with ...
Tópico(s): Electron and X-Ray Spectroscopy Techniques
1990 - Wiley | Polymer Engineering and Science
Satoru Tanaka, Atsushi Kawamoto, Michio Yamawaki, Takayuki Terai, Yoichi Takahashi, Hiroshi Kawamura, Minoru Saito,
In-situ tritium release experiments were performed for γ-LiAlO2 polycrystalline powder (5–9, 6–7, 9–16, 10–14 mesh) and pellets (8 mm diameter × 10 mm high) with three bulk densities of 55% T.D., 78% T.D. and 90% T.D. at 470–780 °C using sweep gas of He+10; 100; 1000; 10000; 30000 ppm H2. The particle size dependence of tritium residence time in the sample was measured using sweep gas of He+10000 ppm H2. The experimental results were analyzed using a two-step diffusion model. Tritium diffusivities in ...
Tópico(s): Ammonia Synthesis and Nitrogen Reduction
1989 - Elsevier BV | Fusion Engineering and Design
Tamaki Masegi, Takayuki Terai, Yoichi Takahashi, Youichi Enomoto, Shugo Kubo,
Effects of ion irradiation on the critical current density of high- T c superconducting Ba 2 YCu 3 O 7-δ thin films have been studied. For the film subjected to a fluence of 5.02×10 11 ions/cm 2 of 514 keV O + , the critical current density determined from I - V characteristics was enhanced by about 10% from 53 to 75 K. The temperature dependence of the critical current density was not affected by ion irradiation. Irradiation effects on the critical temperature of these films have also been investigated.
Tópico(s): Superconducting Materials and Applications
1989 - Institute of Physics | Japanese Journal of Applied Physics
Yoichi Takahashi, Kazutaka Yamamoto, Tetsuo Ohsato, Hiroshi Shimada, Takayuki Terai, Michio Yamawaki,
The heat capacities of four metallic uranium zirconium alloys (Zr at%: 14, 35, 72 and 91) were determined by laser-flash calorimetry from 300 to 1100 K. The heat capacities of uranium-rich alloys showed the normal temperature dependence up to 890 K, while those of zirconium-rich showed a small hump at the temperature region from 650 to 870 K. Above 870 K, heat-capacity anomalies were observed for each alloy sample at respective temperatures corresponding to the phase transitions expected in the uranium- ...
Tópico(s): High Temperature Alloys and Creep
1989 - Elsevier BV | Journal of Nuclear Materials