检索结果-南通市图书馆

DESIGN AND PHOTOFUNCTIONS OF DENDRIMER-ENCAPSULATED POLY(PHENYLENEETHYNYLENE)S

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2001年第2期19卷 161-166页

作者： Takafumi sato Takuzo Aida Department of Chemistry and Biotechnology Graduate School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 JapanDepartment of Chemistry and Biotechnology Graduate School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan

A series of dendrimer-encapsulated poly(phenyleneethynylene)s 4～6 were Synthesize d. The light-harvesting antenna functions of dendrimer frameworks together with the blue-light emitting activities of 4～6 were highli... 详细信息

关键词： Dendrimer Poly(phenyleneethynylene) Molecular wire Light-harvesting antenna Energy transfer

Changes in Repetitive Firing Rate Related to Phase Response Curves for Andronov-Hopf Bifurcations

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2014年第5期31卷 13-16页

作者： Yasuomi D. sato Department of Brain Science and Engineering Graduate School of Life Science and Systems Engineering Kyushu Institute of Technology 2-4 Hibikino Wakamatsu Kitakyushu 808-0196 Japan Frankfurt Institute for Advanced Studies (FIAS) Johann Wolfgang Goethe University Ruth-Moufang-Str.1 D60438 Frankfurt am Main Germany Institute of Industrial Science the University of Tokyo 4-6-1 Komaba Meguro Tokyo 153-8505 Japan

We study specific changes in repetitive firing in the two-dimensional Hindmarsh-Rose （2dHR） oscillatory sys- tem that undergoes a bifurcation transition from the supercritical Andronov-Hopf （All） type to the subcritical Andronov-Hopf （SAH） type. We identify dynamical mechanisms which are responsible for changes of the repeti- tive firing rate during the AH to SAH bifurcation transitions. These include frequency-shift functions in response to small perturbations of a timescale parameter, its multiplicative parameter, and an external input current in the 2dHR oscillatory system. The frequency-shift functions are explicitly represented as functions relating to the phase response curves （PRCs）. Then, we demonstrate that when the timescale is normal and relatively fast, the repetitive firing rate slightly increases and decreases respectively during the AH to SAH bifurcation transition with a change of the intrinsic parameter, whereas it decreases during the SAH to AH bifurcation transition with an increase in the timescale. By analyzing the three different frequency-shift functions, we show that such changes of the repetitive firing rate depend largely on changes of the PRC size. The PRC size for the SAH bifurcation shrinks to the PRC size for the AH bifurcation.

关键词： HOPF bifurcations FREQUENCY shift keying MONOTONIC functions VAN der Pol oscillators (Physics) LIMIT cycles

Temperature Dependence and P/Zn Ratio in Phosphoric Acid Treatment of Zinc Oxide

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2016年第5期32卷 432-436页

作者： Hiroaki Onoda Yurie sato Department of Informatics and Environmental Sciences Kyoto Prefectural University1-5Shimogamo Nakaragi-cyoSakyo-kuKyoto 606-8522Japan

Zinc oxide, which has photocatalytic activity, is used as white pigment for cosmetics. A certain degree of sebum on the skin is decomposed by ultraviolet radiation in sunlight. In this work, zinc oxide was shaken with phosphoric acid to synthesize a white pigment for cosmetics. Zinc oxide was set with 0.1 mol/L of phosphoric acid at P/Zn = 1/1 and 1/2, and then shaking in hot water for 1 h. The chemical composition, powder properties, photocatalytic activity, color phase, and smoothness of the obtained powder were studied. The P/Zn ratio in preparation had an effect on the reaction between phosphoric acid and zinc oxide. The photocatalytic activity of zinc oxide was inhibited by phosphoric acid treatment. The obtained samples had enough high reflectance at the visible light region.

关键词： Zinc oxide Photocatalytic activity Powder processing

An Optimal Power-Law for Synchrony and Lognormally Synaptic Weighted Hub Networks

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第9期30卷 190-193页

作者： Yasuomi D.sato Department of Brain Science and Engineering Graduate School of Life Science and Systems EngineeringKyushu Institute of Technology2-4HibikinoWakamatsuKitakyushu808-0196Japan Frankfurt Institute for Advanced Studies(FIAS) Johann Wolfgang Goethe UniversityRuth-Moufang-Str.1D60438Frankfurt am MainGermany

Details about the structure of a network model are revealed at the spontaneous spike activity level,in which the power-law of synchrony is optimized to that observed in the CA3 hippocampal slice *** network model is subject to spike noise with exponentially distributed interspike *** excitatory(E)and/or inhibitory(I)neurons interact through synapses whose weights show a log-normal *** spike behavior observed in the network model with the appropriate log-normal distributed synaptic weights fits best to that observed in the *** best-fit is then achieved with high activities of I neurons having a hub-like structure,in which the I neurons,subject to optimized spike noise,are intensively projected from low active E neurons.

关键词： app weights network

Tool path generation and optimization for freeform surface diamond turning based on an independently controlled fast tool servo

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Extreme Manufacturing 2022年第2期4卷 145-160页

作者： Yusuke sato Jiwang Yan Department of Mechanical Engineering Keio UniversityYokohama 223-8522Japan

Diamond turning based on a fast tool servo(FTS)is widely used in freeform optics fabrication due to its high accuracy and machining *** a new trend,recently developed high-frequency and long-stroke FTS units are independently driven by a separate control system from the machine tool ***,the tool path generation strategy for the independently controlled FTS is far from *** study aims to establish methods for optimizing tool path for the independent control FTS to reduce form errors in a single step of *** from the conventional integrated FTS control system,where control points are distributed in a spiral pattern,in this study,the tool path for the independent FTS controller is generated by the ring method and the mesh method,*** machined surface profile is predicted by simulation and the parameters for the control point generation are optimized by minimizing the deviation between the predicted and the designed *** demonstrate the feasibility of the proposed tool path generation strategies,cutting tests of a two-dimensional sinewave and a micro-lens array were conducted and the results were *** a result,after tool path optimization,the peak-to-valley form error of the machined surface was reduced from 429 nm to 56 nm for the two-dimensional sinewave by using the ring method,and from 191 nm to 103 nm for the micro-lens array by using the mesh method,respectively.

关键词： ultraprecision machining diamond turning fast tool servo freeform surface tool path optimization

Frequency Gradient with Respect to Temperature for Determination of Classification of the Phase Response Curve

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第12期30卷 170-173页

作者： Yasuomi D.sato Department of Brain Science and Engineering Graduate School of Life Science and Systems EngineeringKyushu Institute of Technology2-4HibikinoWakamatsuKitakyushu808-0196Japan Frankfurt Institute for Advanced Studies(FIAS)Johann Wolfgang Goethe UniversityRuth-Moufang-Str.1D60438Frankfurt am MainGermany

The interesting task here is to study the frequency-current(f–I)curve and phase response curve(PRC),subject to neural temperature variations,because the f–I curve and PRC are important measurements to understand dynamical mechanisms of generation of neural oscillations,and the neural temperature is widely known to significantly affect the ***,little is discussed about how the temperature affects the f–I curve and *** this study,frequencies of the neural oscillations,modulated with the temperature variations,are quantified with an average of the *** frequency gradient with respect to temperature derived here gives clear classifications of the PRC,regardless of the *** is also indicated that frequency decreases with an increase in temperature,resulted from bifurcation switching of the saddle-homoclinic to the saddle-node on an invariant circle.

关键词： form saddle invariant

Frequency Switches at Transition Temperature in Voltage-Gated Ion Channel Dynamics of Neural Oscillators

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2018年第5期35卷 152-155页

作者： Yasuomi D.sato Department of System Information Sciences Graduate School of Information Sciences Tohoku University Institute of Industrial Science University of Tokyo

Understanding of the mechanisms of neural phase transitions is crucial for clarifying cognitive processes in the brain. We investigate a neural oscillator that undergoes different bifurcation transitions from the big saddle homoclinic orbit type to the saddle node on an invariant circle type, and the saddle node on an invariant circle type to the small saddle homoclinic orbit type. The bifurcation transitions are accompanied by an increase in thermodynamic temperature that affects the voltage-gated ion channel in the neural oscillator. We show that nonlinear and thermodynamical mechanisms are responsible for different switches of the frequency in the neural oscillator. We report a dynamical role of the phase response curve in switches of the frequency, in terms of slopes of frequency-temperature curve at each bifurcation transition. Adopting the transition state theory of voltagegated ion channel dynamics, we confirm that switches of the frequency occur in the first-order phase transition temperature states and exhibit different features of their potential energy derivatives in the ion channel. Each bifurcation transition also creates a discontinuity in the Arrhenius plot used to compute the time constant of the ion channel.

关键词： Frequency Switches at Transition Temperature in Voltage-Gated Ion Channel Dynamics of Neural Oscillators

Characteristics of gas-liquid pulsed discharge plasma reactor and dye decoloration efficiency

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2012年第5期24卷 840-845页

作者： Nyein Nyein Aye Masayuki sato Environmental Science and Engineering College Dalian Maritime University

The pulsed high-voltage discharge is a new advanced oxidation technology for water treatment. Methyl Orange （MO） dye wastewater was chosen as the target object. Some investigations were conducted on MO decoloration including the discharge characteristics of the multi-needle reactor, parameter optimization, and the degradation mechanism. The following results were obtained. The color group of the azo dye MO was effectively decomposed by water surface plasma. The decoloration rate was promoted with the increase of treatment time, peak voltage, and pulse frequency. When the initial conductivity was 1700 μS/cm, the decoloration rate was the highest. The optimum distance between the needle electrodes and the water surface was 1 mm, the distance between the grounding electrode and the water surface was 28 mm, and the number of needle electrodes and spacing between needles were 24 and 7.5 mm, respectively. The decoloration rate of MO was affected by the gas in the reactor and varied in the order oxygen 〉 air〉 argon 〉 nitrogen, and the energy yield obtained in this investigation was 0.45 g/kWh.

关键词： multi-needle plasma reactor water surface plasma decoloration efficiency Methyl Orange decoloration

POLYMER COLLOIDS FORMED BY POLYELECTROLYTE COMPLEXATION OF VINYL POLYMERS AND POLYSACCHARIDES IN AQUEOUS SOLUTION

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2013年第1期31卷 39-49页

作者： Hui-dan Liu Takahiro sato Department of Macromolecular Science Osaka University

The polyelectrolyte complex formed from the polyanion and polycation was studied by turbidimetry, static and electrophoretic light scattering, and elementary analysis. Sodium salts of polyacrylate （PA） and heparin （Hep） were chosen as the polyanion, and hydrochloric salts of poly（vinyl amine）（PVA） and chitosan （Chts） as the polycation. Although these vinyl polymers and polysaccharides have remarkably different backbone chemical structures and linear charge densities, all the four combinations PA-PVA, PA-Chts, Hep-PVA, and Hep-Chts provide almost stoichiometric polyelectrolyte complexes which are slightly charged owing to the adsorption of the excess polyelectrolyte component onto the neutral complex. The charges stabilize the complex colloids in aqueous solution of a non-stoichiometric mixture, and the aggregation number of the complex colloids increases with approaching to the stoichiometric mixing ratio. The mixing ratio dependence of the aggregation number for the four complexes is explained by the model proposed in the previous study.

关键词： Polyelectrolyte complex Colloidal dispersion Polyacrylate Poly(vinyl amine) Heparin Chitosan Lightscattering.