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- 저자 : Nishida, M. (검색결과 270 건)
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Nishida, Yusuke,Morimoto, Yuma,Lee, Yong-Min,Nam, Wonwoo,Fukuzumi, Shunichi American Chemical Society 2013 Inorganic chemistry Vol.52 No.6
<P>Rates of formation of a non-heme iron(IV)–oxo complex, [Fe<SUP>IV</SUP>(O)(N4Py)]<SUP>2+</SUP> (N4Py = <I>N</I>,<I>N</I>-bis(2-pyridylmethyl)-<I>N</I>-bis(2-pyridyl)methylamine), via electron-transfer oxidation of [Fe<SUP>III</SUP>(OH)(N4Py)]<SUP>2+</SUP> in acetonitrile (MeCN) containing H<SUB>2</SUB>O (0.56 M) were accelerated as much as 390-fold by addition of proton acceptors such as CF<SUB>3</SUB>COO<SUP>–</SUP>, TsO<SUP>–</SUP> (<I>p</I>-MeC<SUB>6</SUB>H<SUB>4</SUB>SO<SUB>3</SUB><SUP>–</SUP>), NsO<SUP>–</SUP> (<I>o</I>-NO<SUB>2</SUB>C<SUB>6</SUB>H<SUB>4</SUB>SO<SUB>3</SUB><SUP>–</SUP>), DNsO<SUP>–</SUP> (2,4-(NO<SUB>2</SUB>)<SUB>2</SUB>C<SUB>6</SUB>H<SUB>3</SUB>SO<SUB>3</SUB><SUP>–</SUP>), and TfO<SUP>–</SUP> (CF<SUB>3</SUB>SO<SUB>3</SUB><SUP>–</SUP>). The acceleration effect of proton acceptors increases with increasing basicity of the proton acceptors. The one-electron oxidation potential of [Fe<SUP>III</SUP>(OH)(N4Py)]<SUP>2+</SUP> was shifted from 1.24 to 0.96 V vs SCE in the presence of TsO<SUP>–</SUP> (10 mM). The electron-transfer oxidation of Fe<SUP>III</SUP>–OH complex was coupled with the deprotonation process by proton acceptors in which deuterium kinetic isotope effects were observed when H<SUB>2</SUB>O was replaced by D<SUB>2</SUB>O.</P><P>Rates of formation of a non-heme iron(IV)−oxo complex, [Fe<SUP>IV</SUP>(O)(N4Py)]<SUP>2+</SUP>, via electron-transfer oxidation of [Fe<SUP>III</SUP>(OH)(N4Py)]<SUP>2+</SUP> in acetonitrile containing H<SUB>2</SUB>O were accelerated as much as 390-fold by addition of proton acceptors. The one-electron oxidation potential of [Fe<SUP>III</SUP>(OH)(N4Py)]<SUP>2+</SUP> was shifted by −0.28 V in the presence of TsO<SUP>−</SUP> (10 mM). The electron-transfer oxidation occurred following the deprotonation equilibrium with proton acceptors in which deuterium kinetic isotope effects were observed when H<SUB>2</SUB>O was replaced by D<SUB>2</SUB>O.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2013/inocaj.2013.52.issue-6/ic302573x/production/images/medium/ic-2012-02573x_0011.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ic302573x'>ACS Electronic Supporting Info</A></P>
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Nishida, T.,Eruden, B.,Hosoda, K.,Matsuyama, H.,Nakagawa, K.,Miyazawa, T.,Shioya, S. Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.12
The effects of green tea (Camellia sinensis) waste silage and supplemental polyethylene glycol (PEG) on rumen fermentation and blood components were studied in cattle. Six Holstein steers were fed three diets in a 3${\times}$3 Latin square design, replicated twice. One diet was a control with no added silage, and the other two diets were supplemented (20% of the dry matter) with green tea waste silage either with (PEG) or without PEG (tea). Most of the fermentation parameters including major volatile fatty acids (VFA) were not affected by the diet treatments. The concentrations of high density lipoprotein cholesterol in the PEG group and urea nitrogen in the tea and PEG groups were greater than those in the control before morning feeding. The plasma 6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid equivalent concentration was not different before morning feeding, but 3 h after morning feeding, its concentrations in both the tea and PEG groups were higher than in the control. Although the concentration of plasma vitamin A in the animals was not affected by feeding green tea waste silage, the concentrations of plasma vitamin E were significantly higher in the tea and PEG groups than in the control, both before and 3 h after morning feeding. The results from the present study suggest that feeding diets containing 20% of the dietary dry matter as green tea waste silage to Holstein steers has no negative impact on their ruminal fermentation, and increases their plasma antioxidative activity and concentration of vitamin E.
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Evaluation of temperatures and flow areas of the Phebus Test FPT0
Nishida Koji,Sano Naoki,Sakurai Seitaro,Murase Michio 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.3
The cladding temperatures and axial mass distribution computed by MAAP5 were compared with their measured values in the test bundle of the Phebus Test FPT0. The computed cladding temperatures were in good agreed with the measured values in the pre-transient phase. In the transient heat-up phase, the computed temperatures were overestimated by the Baker-Just correlation in MAAP5, but the computed temperatures could simulate the subsequently measured values. The computed mass distribution in the axial direction was in qualitative agreement with the measured one for post-test fuel damage observations. The calculated flow areas of inner and outer regions in the test bundle were compared with the photographic observations. MAAP5 computed them at the height of 0.2 m where the molten pool formed was in qualitative agreement with the photographic observations. It was found that the remaining steam flow paths might be caused by the gas-liquid two-phase flow countercurrent flow limitation.
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Robust Deadbeat Current Control Method for Three-Phase Voltage-Source Active Power Filter
Nishida, Katsumi,Ahmed, Tarek,Nakaoka, Mutsuo The Korean Institute of Power Electronics 2004 JOURNAL OF POWER ELECTRONICS Vol.4 No.2
This paper is concerned with a deadbeat current control implementation of shunt-type three-phase active power filter (APF). Although the one-dimensional deadbeat control method can attain time-optimal response of APF compensating current, one sampling period is actually required fur its settling time. This delay is a serious drawback for this control technique. To cancel such a delay and one more delay caused by DSP execution time, the desired APF compensating current has to be predicted two sampling periods ahead. Therefore an adaptive predictor is adopted for the purpose of both predicting the control error of two sampling periods ahead and bringing the robustness to the deadbeat current control system. By adding the adaptive predictor output as an adjustment term to the reference value of half a source voltage period before, settling time is made short in a transient state. On the other hand, in a steady state, THD (total harmonic distortion) of the utility grid side AC source current can be reduced as much as possible, compared to the case that ideal identification of controlled system could be made.
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Nishida, Seiichiro,Satoh, Hiroyasu The Korean Society of Pharmacology 2009 The Korean Journal of Physiology & Pharmacology Vol.13 No.5
Effects of quercetin, a kind of flavonoids, on the vasodilating actions were investigated. Among the mechanisms for quercetin-induced vasodilatation in rat aorta, the involvement with the $Ca^{2+}$ activated $K^+$ ($K_{Ca}$) channel was examined. Pretreatment with NE ($5\;{\mu}M$) or KCl (60 mM) was carried out and then, the modulation by quercetin of the constriction was examined using rat aorta ring strips (3 mm) at $36.5^{\circ}C$. Quercetin (0.1 to $100\;{\mu}M$) relaxed the NE-induced vasoconstrictions in a concentrationdependent manner. NO synthesis (NOS) inhibitor, NG-monomethyl-L-arginine acetate (L-NMMA), at $100\;{\mu}M$ reduced the quercetin ($100\;{\mu}M$)-induced vasodilatation from $97.8{\pm}3.7%$ (n=10) to $78.0{\pm}11.6%$ (n=5, p<0.05). Another NOS inhibitor, L-NG-nitro arginine methyl ester (L-NAME), at $10\;{\mu}M$ also had the similar effect. In the presence of both $100\;{\mu}M$ L-NMMA and $10\;{\mu}M$ indomethacin, the quercetin-induced vasodilatation was further attenuated by $100\;{\mu}M$ tetraethylammonium (TEA, a $K_{Ca}$ channel inhibitor). Also TEA decreased the quercetin-induced vasodilatation in endothelium-denuded rat aorta. Used other $K_{Ca}$ channel inhibitors, the quercetin-induced vasodilatation was attenuated by $0.3\;{\mu}M$ apamin (a SK channel inhibitor), but not by 30 nM charybdotoxin (a BK and IK channel inhibitor). Quercetin caused a concentration-dependent vasodilatation, due to the endotheliumdependent and -independent actions. Also quercetin contributes to the vasodilatation selectively with SK channel on smooth muscle.
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Property of New SEGLESS that is Segregation-free Steel Powder Mixture for Warm Compaction
Nishida Satoshi,Furuta Satoshi 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Recently warm compaction techniques are focused on and commercialization of one high-density compaction process in the P/M industry. Another development is a new SEGLESS using a developed lubricant that reduces ejection force at room temperature compaction. It is possible to achieve high-density by reducing lubricant amount. In this paper we confirmed that green density was 7.35 g/cm3 at 686MPa of compaction pressure when the new SEGLESS was applied to relatively lower temperature warm compaction process, such as 80℃.
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Structural Relaxation of Semiconducting Vanadate and IR-Transmitting Gallate Glasses Containing Iron
Nishida, Tetsuaki The Korean Ceramic Society 2000 The Korean journal of ceramics Vol.6 No.1
Glass transition temperature (T/sub g/) is proportional to the quadrupole splitting(Δ) of Fe(III) obtained from the /sup 57/Fe Mossbauer spectra (T/sub g/-Δ rule (1990)). The values of Δ reflect the distortion of Fe(III) atoms, which occupy the sites of network-forming atoms. Heat treatment of potassium vanadate and calcium gallate glasses at around the individual T/sub g/ causes a structural relaxation, accompanying a linear decrease of T/sub g/ and Δ values. These experimental results prove that T/sub g/ decreases with a decrease in the distortion of VO₄, GaO₄, and FeO₄tetrahedra, as the T/sub g/-Δ rule predicted.
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