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151.
Statistical nonstationarity of the composition of styrene with methyl methacrylate in the cooligomer
Eishun Tsuchida Kunio Mishima Kiwamu Kitamura Isao Shinohara 《Journal of polymer science. Part A, Polymer chemistry》1972,10(12):3615-3625
It was found that the composition of cooligomer produced in the styrene(A)–methyl methacrylate(B)–CCl4(S) system deviates from the statistical steady-state composition predicted from the Mayo-Lewis equation on the low molecular weight side when the molar ratio of [A]/[B] is large. When the molar ratio of [A]/[B] is small, however, it is not obvious whether or not this phenomenon is observed, because the cooligomer of low molecular weight cannot be obtained easily since the chain transfer constant of the poly(methyl methacrylate) radical to CCl4 is very small in comparison, with that of the polystyryl radical. This behavior is shown to be attributable mainly to the preferential consumption of styrene monomer in the initiation step, based on the structure of the cooligomer, as inferred from the mechanism of the initiation, transfer, and termination, and the stochastic approach in which the cooligomerization process is regarded as a Markov process. 相似文献
152.
153.
Kiyoshi Mishima 《Chemical physics letters》1983,96(5):552-554
An expression of the depolarization ratio is presented for multilayered spherical shells using the Rayleigh-Gans theory of light scattering. The effect of multilamellar bilayers of a phospholipid vesicle on the depolarization is investigated numerically. It is shown that the depolarization ratio decreases markedly with increasing number of bilayers. 相似文献
154.
Spectrophotometric determination of carp vitellogenin using a sequential injection analysis technique equipped with a jet ring cell 总被引:1,自引:0,他引:1
Soh N Nishiyama H Mishima K Imato T Masadome T Asano Y Kurokawa Y Tabei H Okutani S 《Talanta》2002,58(6):1123-1130
A sequential injection analysis (SIA) technique, in which antibody-immobilized microbeads were transferred to a jet ring (JR) cell, was used in determination of carp vitellogenin (Vg). The determination is based on a sandwich immunoassay in which two types of reactions between anti carp Vg antibodies and carp Vg are used. Namely, the antibody for the first reaction step was immobilized on microbeads (Sephadex beads), and an antibody labeled with a horseradish peroxidase (HRP) was used in the second step of the reaction. A mixed solution of hydrogen peroxide and o-phenylenediamine (OPD) was used as the source of the chromophore in the reaction. The microbeads-immobilized antibody, Vg analyte, HRP-labeled anitbody and the color developing solution were introduced automatically into the JR cell of the SIA system in a programmed sequence, and the absorbance of the oxidized OPD product was used to determine the amount of Vg present. The optimal incubation times for the immuno-raction for the first and the second steps were determined at 120 and 60 min, respectively, taking into account the sensitivity to the Vg determination. Under these conditions, a good linear correlation was obtained between Vg concentration and the absorbance of the oxidized OPD. The lower detection limit for the determination of Vg was about 5 ng ml−1 in this system. The method developed here represents a simple, accurate method for the determination method of Vg. 相似文献
155.
Optimal control theory is applied to a molecular vibrational system in light of its possible application to quantum computing (QC). We present the numerical results of an ammonia molecular vibrational model system with two modes: a bending mode and an asymmetric stretching mode. We demonstrate logic gates fundamental to QC algorithms, namely Hadamard and controlled-NOT gates. Our results show that averages of population transfers at each gate are above 93% high fidelity. A mode that has a double-well structured potential is found to have many transfer pathways, which facilitates obtaining optimal laser pulses. 相似文献
156.
N. Shioyasu K. Kagetsu K. Mishima M. K. Kubo T. Tominaga K. Nishiyama K. Nagamine 《Hyperfine Interactions》1994,84(1):477-481
Diamagnetic muon species in a spin-crossover complex diisothiocyanatobisphenanthrolineiron(II) were investigated: two species with different spin relaxation functions and rates were observed over the range from 21 to 293 K. The sum of their yields changed at about the spin transition temperature of the complex, where the spin state of the complex changes from paramagnetic to diamagnetic when it is cooled down across the temperature. The results suggest that paramagnetic muon species could exhibit diamagnetic muon-like SR signals in paramagnetic environment. 相似文献
157.
Morifumi Fujita Eri Mishima Tadashi Okuyama 《Journal of Physical Organic Chemistry》2007,20(4):241-244
Solvolyses of monomethoxy‐ and dimethoxyphenyl(phenyl)iodonium (ArI+Ph) tetrafluoroborates were carried out in methanol and 2,2,2‐trifluoroethanol (TFE) at 130 °C. The solvolysis products include alkoxide substitution products (ArOR and PhOR) as well as iodoarenes (PhI and ArI). The ratios of ArOR/PhOR range from 8/2 to 4/6. The results are argued against formation of aryl cation. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
158.
Miwako Mishima 《Discrete Mathematics》2008,308(12):2617-2619
The spectrum of values v for which a 1-rotational Steiner triple system of order v exists over a dicyclic group is determined. 相似文献
159.
Kenichi Maruyama Yuji Mishima Keiji Minagawa Junko Motonaka 《Journal of Electroanalytical Chemistry》2001,510(1-2)
A transition metal complex as an electrochemical probe of a DNA sensor must have an applicable redox potential, high binding affinity and chemical stability. Some complexes with the dipyrido[3,2-a:2′,3′-c]phenazine (DPPZ) ligand have been reported to have high binding affinity for DNA. However, it was difficult to detect the targeted DNA electrochemically using these complexes because of the relatively high redox potential. In this work, a combination of bipyridine ligands with functional groups (---NH2, ---CH3 and ---COOH) and the DPPZ ligand were studied. The introduction of electron-donating groups was effective for controlling the redox potential of the DPPZ-type osmium complex. The [Os(DA-bpy)2DPPZ]2+ complex (DA-bpy; 4,4′-diamino-2,2′-bipyridine) had a lower half-wave potential (E1/2) of 147 mV (vs. Ag AgCl) and higher binding affinity with DNA {binding constant, K=3.1×107 M−1 in 10 mmol dm−3 Tris–HCl buffer with 50 mmol dm−3 NaCl (pH 7.76)} than those of other complexes. With the single stranded DNA (ssDNA) modified gold electrode, the hybridization signal (ΔI) of the [Os(DA-bpy)2DPPZ]2+ complex was linear in the concentration range of 1.0 pg ml−1–0.12 μg ml−1 for the targeted DNA with a regression coefficient of 0.999. The detection limit was 0.1 pg ml−1. 相似文献
160.