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41.
Takao Ikariya Yasutoshi Ishikawa Kiyomiki Hirai Sadao Yoshikawa 《Journal of organometallic chemistry》1985,288(3):311-315
The reaction of WCl6/LiAlH4 with imines, R′NCHR, gave tertiary amines, R′N(CH2R)2, and secondary amines, R′NHCHRCH2R. Isotope labeling experiments revealed that the reaction involved two types of azatungstenacyclobutanes, HR and HR, produced from the reaction of an alkylidene tungsten intermediate with the imine CN double bond. Formation of these metallacyclobutanes is highly dependent on the solvent used. 相似文献
42.
Makoto Mikami Kwang-Soon Park Yasutoshi Noda Yoshitaka Furukawa 《Journal of Crystal Growth》1994,140(3-4):429-431
Radical-assisted metalorganic chemical vapor deposition (MOCVD) of ZnSe has been performed by using diethylzinc (DEZn) and diethylselenide (DESe) as a source and azo-t-butane ((t-C4H9)2N2)and nitrogen trifluoride (NF3) as co-reactants. The growth rate was significantly increased in the measured temperature range of 623 to 723 K. 相似文献
43.
Structural investigation of SnO-B2O3 glasses by solid-state NMR and X-ray photoelectron spectroscopy
Akitoshi Hayashi Miyuki NakaiMasahiro Tatsumisago Tsutomu MinamiYusuke Himei Yoshinari MiuraMotomi Katada 《Journal of Non》2002,306(3):227-237
Local structure of the SnO-B2O3 glasses was investigated using several spectroscopic techniques. 11B MAS-NMR spectra suggested that BO4 tetrahedral units maximized at around the composition with 50 mol% SnO. The BO4 units were still present at compositions with high SnO content (67 mol% SnO), suggesting that SnO acted not only as a network modifier but also as a network former. O1s photoelectron spectra revealed that the addition of small amounts of SnO formed non-bridging oxygens (NBO) (B-O?Sn) and the amounts of NBO increased with an increase in SnO content. 119Sn Mössbauer spectra indicated that Sn was present only as Sn(II) in the glasses. The structure of the SnO-B2O3 glasses was compared with that of conventional alkali borate glasses and lead borate glasses. The thermal and viscous properties of these glasses were discussed on the basis of the glass structure revealed in the present study. 相似文献
44.
Yasutoshi Shirota Md. Nurul Amin Yoshifumi Watanabe Satoshi Kaneco Hideyuki Katsumata Tohru Suzuki Kiyohisa Ohta 《Analytica chimica acta》2006,560(1-2):159-163
The determination of alkali metal chloride in river waters by sequential molecular vapor elution analysis (SMVEA) using a molecular absorption detector (MA) is reported. An improved molybdenum column was developed for SMVEA. An optimum flow rate of carrier gas (pure argon or nitrogen) for separation of metal vapors was 12.0 ml min−1. Lithium chloride and sodium chloride peaks completely separated from potassium, rubidium, and cesium chlorides but CaCl2, FeCl2, MgCl2, and MnCl2 peaks did not appear at a column temperature of 1000 °C and vaporization temperature of 1000 °C. The appearing order of these metal chlorides was LiCl, NaCl, KCl, RbCl, and CsCl. It was not understood by considering the boiling points of these metal chlorides. The delay of appearing time is due to an interaction between the molecular vapors and inside surface of the column. Under the experimental conditions, the number of theoretical plates was 247 for LiCl and 268 for NaCl in the improved column. Under the optimal experimental conditions, river waters were analyzed for lithium and sodium chlorides. The analytical results agreed well with the recoveries were in the range of 94–105%. By SMVEA, it was found that lithium and sodium chlorides in waters were determined without interference of matrix elements, no chemical treatment for river water samples. 相似文献
45.
Chaotic oscillations of the transverse magnetic (TM) mode, which is not a common lasing mode, are excited by using polarization-rotated
optical feedback from the transverse electric (TE) mode in a semiconductor laser. In our previous paper, we found that the
dynamics were strongly dependent on their RF components under the condition of moderate optical feedback from the TE mode
to the TM mode and that they were divided into three RF regions; low-pass filtered signals with a lower frequency than the
laser relaxation oscillation frequency, intermediate RF components including the relaxation oscillation frequency, and high-pass
filtered signals with a higher frequency higher than the relaxation oscillation frequency. Depending on the frequency bands,
the laser outputs showed different correlations. In the present study, using such schemes, the polarization-rotated beam from
a transmitter laser (i.e., the rotated TE-mode beam of a transmitter laser) is injected into a receiver laser. We experimentally
observe chaos synchronization in accordance with the dynamics of RF components on the transmitter laser side. We also perform
numerical calculations using a model and obtain good agreement between the theoretical and experimental results. 相似文献
46.
47.
Yoshinori Kamiya Yasutoshi Naito Keishin Mizoguchi Katsuhiko Terada Johann Moreau 《Journal of Polymer Science.Polymer Physics》1997,35(7):1049-1053
The Flory–Huggins interaction parameters χ for 23 gases (He, Ne, Ar, Kr, Xe, H2, N2, O2, N2O, CO2, CH4, C2H4, C2H6, C3H6, C3H8, 1,3-C4H6, four C4H8's, n-C4H10, iso-C4H10, and n-C5H12) in five rubbery polymers (1,2-polybutadiene (PB), poly(ethylene-co-vinyl acetate)) (EVAc), polyethylene (PE), polypropylene (PP), and poly(dimethyl siloxane) (PDMS) were determined from either literature data on Henry's law coefficient and partial molar volume or those on sorptive dilation for each polymer/gas system. Values of χ for the gases increased in the order of PDMS < PP ≡ PB < EVAc ≡ PE. Among the gases except He and H2 whose χ values are not reliable, Ne and Xe have respectively the highest and the lowest values of χ for the polyolefins. The χ values of the hydrocarbons were compared together with previously reported χ values of n-alkanes C3-C10. The dependencies of χ upon concentration and temperature were discussed on the basis of the literature data. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35 : 1049–1053, 1997 相似文献
48.
An outer approximation method for minimizing the product of several convex functions on a convex set 总被引:1,自引:0,他引:1
This paper addresses the minimization of the product ofp convex functions on a convex set. It is shown that this nonconvex problem can be converted to a concave minimization problem withp variables, whose objective function value is determined by solving a convex minimization problem. An outer approximation method is proposed for obtaining a global minimum of the resulting problem. Computational experiments indicate that this algorithm is reasonable efficient whenp is less than 4.This research was partly supported by Grant-in-Aid for Scientific Research of the Ministry of Education, Science and Culture, Grant No. (C)03832018 and (C)04832010. 相似文献
49.
Yoshinori Kamiya Yasutoshi Naito Dominique Bourbon 《Journal of Polymer Science.Polymer Physics》1994,32(2):281-286
Sorption and dilation properties of polymer-gas systems involving poly(ethylene-co-vinyl acetate) and N2, CH4, or CO2, have been investigated at pressures up to 50 atm at temperatures of 10–40°C. Sorption isotherms for low-solubility gases (i.e., CH4 and N2) can be described by Henry's law, and those for high-solubility gas (i.e., CO2) by Flory-Huggins dissolution equation. Dilation isotherms are similar in contour to the corresponding sorption isotherms. From the obtained sorption and dilation data, partial molar volumes of the gases in the polymer were determined as a function of temperature. Thermal expansivity of dissolved CO2 molecules was estimated at ca. 2.4 × 10?3°C?1 from the temperature dependence of partial molar volume. The expansivity is smaller than that of liquid CO2 and larger than those of the polymer and organic liquids. © 1994 John Wiley & Sons, Inc. 相似文献
50.