检索结果-南通市图书馆

MicroGrid Designer:user-friendly design,operation and control assist tools for resilient microgrid and autonomous community

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Global Energy Interconnection 2022年第3期5卷 249-258页

作者： ryuichi Yokoyama Yicheng Zhou Energy and Environment and Technology Research Institute and Waseda University 1-22-2 Nishi-Waseda ShinjukuNishi-Waseda East Wing 106Tokyo169-0051Japan

During this decade,many countries have experienced natural and accidental disasters,such as typhoons,floods,earthquakes,and nuclear plant accidents,causing catastrophic damage to infrastructures.Since the end of 2019,all countries of the world are struggling with the COVID-19 and pursuing countermeasures,including inoculation of vaccine,and changes in our lifestyle and social structures.All these experiences have made the residents in the affected regions keenly aware of the need for new infrastructures that are resilient and autonomous,so that vital lifelines are secured during calamities.A paradigm shift has been taking place toward reorganizing the energy social service management in many countries,including Japan,by effective use of sustainable energy and new supply schemes.However,such new power sources and supply schemes would affect the power grid through intermittency of power output and the deterioration of power quality and service.Therefore,new social infrastructures and novel management systems to supply energy and social service will be required.In this paper,user-friendly design,operation and control assist tools for resilient microgrids and autonomous communities are proposed and applied to the standard microgrid to verify its effectiveness and performance.

关键词： Microgrid Autonomous community Grid design and analysis Resilience Unit commitment Economic load dispatch Load frequency control Dynamic power flow Energy management system

A fuzzy control and neural network based rotor speed controller for maximum power point tracking in permanent magnet synchronous wind power generation system

在线全文

学校读者我要写书评

暂无评论

全球能源互联网:英文版 2023年第5期6卷 554-566页

作者： Min Ding Zili Tao Bo Hu Meng Ye Yingxiong Ou ryuichi Yokoyama School of Automation China University of GeosciencesWuhan 430074P.R.China Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan 430074P.R.China Global Energy Interconnection Group Co. LtdSTATE GRID Corporation of ChinaBeijing 100032P.R.China School of Environment and Energy Engineering Waseda UniversityTokyo169-8050Japan

When the wind speed changes significantly in a permanent magnet synchronous wind power generation system,the maximum power point cannot be easily determined in a timely manner.This study proposes a maximum power reference signal search method based on fuzzy control,which is an improvement to the climbing search method.A neural network-based parameter regulator is proposed to address external wind speed fluctuations,where the parameters of a proportional-integral controller is adjusted to accurately monitor the maximum power point under different wind speed conditions.Finally,the effectiveness of this method is verified via Simulink simulation.

关键词： Maximum wind power tracking Fuzzy control Neural network

Microgrids and a Community with a Shared Future for Mankind

在线全文

学校读者我要写书评

暂无评论

Global Energy Interconnection 2022年第3期5卷 I0002-I0005页

作者： Yasuyo Yamazaki ryuichi Yokoyama Waseda University

1.The community with a shared future for humankind is the community of the earth’s biosphere The civilization and culture that human beings have created thus far,the economy,society and ideas,the nation,and religion,will vanish if human beings perish.Recent developments in astrophysics have been remarkable,and observations have been made from telescopes with incredible accuracy and range at great expense.Although extraterrestrial exploration has reached celestial bodies far away,the existence of“life”is yet to be discovered beyond Earth.Experiments aimed at establishing an earthly“artificial biosphere”on Mars have been unsuccessful.

关键词： earth establishing hough

A Series of Soluble Planar Oligorylenes up to Hexarylene

维普期刊数据库评论

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 Chemistry 2023年第9期41卷 1023-1027页

作者： ryuichi Fujita Shoko Yoshida Haruka Kano Kyohei Matsuo Hironobu Hayashi Hiroko Yamada Naoki Aratani Division of Materials Science Nara Institute of Science and Technology(NAIST)8916-5 Takayama-choIkoma 630-0192Japan

Preparation of large rylenes often needs the use of solubilizing groups along the rylene backbone,which results in the distortion of the skeleton and thus broadening of the absorption spectrum.In this work,we successfully synthesized 2,5,8,16,19,22-hexakis[2,6-bis(tri-fluoromethyl)phenyl]hexarylene(H)by using an oxidative fusion reaction of perylene trimer in 5%yield.The product is soluble in common organic solvents and could be purified with column chromatography.Single-crystal X-ray diffraction analysis revealed that the hexarylene core is not disturbed by the substituents very much and is almost planar.The longest absorption of H exhibits a sharp peak at 831 nm and an on-set at 875 nm in toluene with a small full-width-at-half-maximum(FWHM)of 660 cm^(-1).The molar extinction coefficient is as large as 131,000 M^(-1)cm^(-1).The substituents could not perturb the electronic properties of the hexarylene because aryl groups are perpendicular to the hexarylene core and the carbon atoms at 2,5,16,19-positions have negligible coeffi-cients on its HOMO and LUMO,estimated by theoretical calculations.As a result,the hexarylene having less absorption at the visible light region was stable enough in solution under the LED room light for more than 1 week.This strategy gives a useful guideline to establish the near-infrared materials that exhibit stability under ambient conditions.

关键词： Oligorylenes Undistorted skeleton Near infrared absorption Crystal structure Effective conjugation length

Liquid–liquid equilibrium extraction of ethanol with mixed solvent for bioethanol concentration

维普期刊数据库评论

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 Chemical Engineering 2016年第2期24卷 253-258页

作者： Hiroaki Habaki Haihao Hu ryuichi Egashira Department of International Development Engineering Graduate School of Science and EngineeringTokyo Institute of Technology

The extraction of ethanol with the solvents of aldehydes mixed with m-xylene was studied for the bioethanol concentration process.Furfural and benzaldehyde were selected as extraction solvents,with which the solubility of water is small,expecting large distribution coefficient of ethanol.The liquid–liquid two-phase region was the largest with m-xylene solvent,followed by benzaldehyde and furfural.The region of two liquid–liquid phase became larger with the mixed solvent of m-xylene and furfural than that with furfural solvent.The NRTL model was applied to the ethanol–water–furfural–m-xylene system,and the model could well express the liquid–liquid equilibrium of the system.For any solvent used in this study,the separation selectivity of ethanol relative to water decreased as the distribution coefficient of ethanol increased.The separation selectivity with m-xylene was the largest among the employed solvents,but the distribution coefficient was the smallest.The solvent mixture of furfural and m-xylene showed relatively high distribution coefficient of ethanol and separation selectivity,even in the higher mass fraction of m-xylene in the solvent phase.The ethanol extraction with a countercurrent multistage extractor by a continuous operation was simulated to evaluate the extraction performance.The ethanol content could be concentrated in the extract phase with relatively small number of extraction stages but low yield of ethanol was obtained.

关键词：混合溶剂乙醇浓度萃取平衡分离选择性乙醇提取混合二甲苯间二甲苯分布系数

A Simple Method for Synthesizing Ultra-high-molecular-weight Polystyrene through Emulsion Polymerization Using Alkyl-9-BBN as an Initiator

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2018年第5期36卷 592-597页

作者： Chao Zhao ryuichi Sugimoto Yusuke Naruoka School of Environmental Science and Engineering Kochi University of Technology

Styrene emulsion polymerization using an alkyl-9-BBN, synthesized by reacting 9-BBN（9-borabicyclo-[3.3.1]-nonane） and styrene, in an aqueous sodium dodecyl sulfate（SDS） solution was studied. Ultra-high-molecular-weight（〉 1.0 × 10~7） polystyrene was synthesized using a radical initiator formed through the aerobic oxidation of this alkyl-9-BBN in a high yield（〉 80%）. The kinetics of this emulsion polymerization of styrene with the alkyl-9-BBN was investigated. We confirmed that in the initial stage of the polymerization, the initial reaction rate followed first-order kinetics. The activation energy for this emulsion polymerization of styrene was approximately 56.2 kJ/mol.

关键词： Emulsion polymerization 9-BBN Ultra-high molecular weight polystyrene

The Dauki Fault at the Shillong Plateau-Bengal Basin Boundary in Northeastern India:2D Finite Element Modeling

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2012年第6期23卷 854-863页

作者： Md Shofiqul Islam ryuichi Shinjo Faculty of Science University of the RyukyusOkinawa 903-0213Japan Department of Petroleum and Mining Engineering Shahjalal University of Science and TechnologySylhet 3114Bangladesh

The Dauki fault is a major fault along the southern boundary of the Shillong plateau that may be a source of destructive seismic hazards for the adjoining areas, including northeastern Bangladesh. In this study, we simulated the present stress distribution and the ongoing convergence deformation within the study area using numerical simulation. This simulation attempts to deter- mine the proper dip angle of the Dauki fault from a variety of differently established models but with the same realistic boundary conditions. The simulated stress field helped to predict the type of tec- tonic environment and the faulting patterns of the study area. The best-fit model can account for the compressive stress regime in the study area, except in the uppermost part of the Shillong plateau, the Bengal basin, and Assam areas where extensional stress regimes exists. In the model, the elements for which Mohr-Coulomb＇s failure occurs correspond with the observed earthquake data that refer to the Dauki fault as a north-dipping thrust fault.

关键词： Dauki fault Bengal basin tectonic stress earthquake.

Tectonics in the Northwestern West Philippine Basin

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Geosciences 2008年第3期19卷 191-199页

作者：倪祥龙吴时国 Shinjo ryuichi Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of SciencesQingdao 266071 Research Institute of Petroleum Exploration ＆ Development-Northwest （NWGI） PetroChina Lanzhou 730020 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China China University of Petroleum （Huadong） Qingdao 266555 China Department of Physics and Earth Sciences University of the Ryukyus Senbaru-1 Nishihara Okinawa 903-0213 Japan

The West Philippine basin （WPB） is a currently inactive marginal basin belonging to Philippine Sea plate, which has a complex formation history and various crust structures. Based on gravity, magnetic and seismic data, the tectonics in West Philippine basin is characterized by amagma spreading stage and strike slip fractures. NNE trending Okinawa-Luzon fracture zone is a large fracture zone with apparent geomorphology and shows a right-handed movement. The results of joint gravity-magnetic-seismic inversion suggest that the Okinawa-Luzon fracture zone has intensive deformation and is a transform fault. Western existence of the NW trending fractures under Ryukyu Islands Arc is the main cause of the differences between south and north Okinawa Trough. The Urdaneta plateau is not a remained arc, but remnant of mantle plume although its lava chemistry is similar to oceanic island basalt （OIB）.

关键词： tectonics amagma spreading gravity anomaly magnetic anomaly West Philippine basin.

Neutral-point voltage control for a three-level DC-AC inverter using equivalent-input-disturbance approach

在线全文

学校读者我要写书评

暂无评论

电力系统保护与控制 2013年第1期41卷 183-189页

作者： Zhang Jie Yokoyama ryuichi She Jinhua Wu Win Waseda University Japan Tokyo 169-8050 Tokyo University of Technology Japan Tokyo 192-0982 Central South University Changsha 410083

One problem with a single source three-level inverter is the drafting of its neutral-point voltage. This may occur during transition or when unbalanced loads are connected to the inverter system. Wiation of neutral-point voltage may greatly deteriorate the power quality. In this paper, we employ an equivalent-input-disturbance approach to deal with this problem. By adding an extra neutral leg, the control problem of neutral-point voltage is converted to a disturbance rejection problem. This method suppresses the variation of the neutral-point voltage to a low level and reduces the capacity of DC-link capacitors. Simulation results show the effectiveness of the method.

关键词： inverter multi-level neutral-point voltage EID disturbance