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A Novel Method for Producing Hydrogen from a Hydrocarbon Liquid Using Microwave In-liquid Plasma

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Journal of Energy and Power Engineering 2016年第6期10卷 335-342页

作者： Andi Amijoyo Mochtar Shinfuku Nomura shinobu mukasa Hiromichi Toyota Kohji Kawamukai Kojiro Uegaito Fadhli Syahrial Graduate School of Science and Engineering Ehime University Ehime 791-8577 Japan Mechanical Engineering Department Hasanuddin University Makassar 90245 Indonesia Center for Advanced Research on Energy University Teknikal Malaysia Melaka Melaka 76100 Malaysia

The in-liquid plasma method is a technology in which plasma of several thousand degrees Kelvin is generated within bubbles in a liquid. The purpose of this study is to enhance the hydrogen production rate from waste oils by using in-liquid plasma. Two types of microwave in-liquid plasma apparatus are adopted for hydrogen production. One is a conventional MW （microwave） oven, the other is a microwave generator with a waveguide to apply the in-liquid plasma steam reforming method in n-dodecane. The produced gas is 58%-90% hydrogen in these methods. The hydrogen production rate is improved by stabilization of the bubble growth. The gas production rate by plasma feeding steam in n-dodecane is 1.4 times higher than that without feeding steam.

关键词： In-liquid plasma hydrogen microwave n-dodecane steam reforming waste oils.

Fuel Gas Production from Biomass Sources by Radio Frequency In-Liquid Plasma Method

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Journal of Power and Energy Engineering 2015年第8期3卷 28-35页

作者： Ismail Rahim Shinfuku Nomura shinobu mukasa Hiromichi Toyota Katsunori Kawanishi Yoshihiko Makiura Kazuhiko Kogoh Kunihiro Ohshima Susumu Katsuen Department of Engineering for Production and Environment Graduate School of Science and Engineering Ehime University Ehime Japan Department of Automotive Engineering Education State University of Makassar Makassar Indonesia KURABO Industries Ltd. Neyagawa Japan

Cellulose is a kind of saccharide that is the main component in cell walls of plants and therefore is the organic compound that exists in the largest amount in nature. The purpose of this experiment is to convert cellulose to a fuel. Radio frequency (RF) in-liquid plasma is generated in a cellulose distributed solution and a glucose solution, and the generation gas rate is measured. While hydrogen is the main gas generated by the plasma breakdown, carbon monoxide, carbon dioxide, and low-grade flammable gases are also produced. In the glucose water solution or the glucose distributed solution, the solution itself evaporates and decomposes inside the plasma but since the saccharides are non-volatile, they cannot penetrate into the plasma and are not decomposition. However, when the cellulose is at concentrations of 30 wt% or more, it becomes granular and can directly enter the plasma as a solid, where the plasma decomposes the cellulose itself, significantly increasing the amount of gas generated. In addition, the spectrometry of the plasma emission shows the solution after the creation of plasma has the ability to absorb ultraviolet light.

关键词： In-Liquid Plasma Radio Frequency Plasma Saccharide Hydrogen Decomposition

Numerical Investigation on Detonation Wave through U-bend

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Journal of Thermal Science 2010年第6期19卷 540-544页

作者： shinobu Otsuka Masaya Suzuki Makoto Yamamoto Department of Mechanical Engineering Tokyo University of Science

Pulse detonation engine (PDE) is expected for a next-generation propulsion system. PDE is a promising engine that can generates power and thrust by using intermittent detonation. Promotion of deflagration to detonation transition (below DDT) is a key issue to realize this system. PDE has experimentally been investigated, and it was confirmed that detonation tubes with U-shaped bends are useful for fast DDT. However, the mechanism of DDT promotion due to U-bends has not been well clarified. In the present study, the influence of a U-bend on detona-tion wave propagation is researched with computational fluid dynamics (CFD). The numerical results show that detonation wave disappears once near the U-bend inlet and restarts after passing through it. In addition, it was found that the use of the U-bend with small channel width and curvature radius can induce fast DDT.

关键词： Detonation Deflagration to Detonation Transition (DDT) U-bend Computational Fluid Dynamics

A Fine-Grained Runtime Power/Performance Optimization Method for Processors with Adaptive Pipeline Depth

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Journal of Computer Science & Technology 2011年第2期26卷 292-301页

作者：姚骏 shinobu Miwa Hajime Shimada Shinji Tomita Graduate School of Information Science Nara Institute of Science and Technology School of Engineering Tokyo University of Agriculture and Technology Graduate School of Informatics Kyoto University Institute for Integrated Cell-Material Sciences Kyoto University

Recently, a method known as pipeline stage unification （PSU） has been proposed to alleviate the increasing energy consumption problem in modern microprocessors. PSU achieves a high energy efficiency by employing a changeable pipeline depth and its working scheme is eligible for a fine control method. In this paper, we propose a dynamic method to study fine-grained program interval behaviors based on some easy-to-get runtime processor metrics. Using this method to determine the proper PSU configurations during the program execution, we are able to achieve an averaged 13.5% energydelay-product （EDP） reduction for SPEC CPU2000 integer benchmarks, compared to the baseline processor. This value is only 0.14% larger than the theoretically idealized controlling. Our hardware synthesis result indicates that the proposed method can largely decrease the hardware overhead in both area and delay costs, as compared to a previous program study method which is based on working set signatures.

关键词： dynamic optimization energy saving fine-grained pipeline stage unification workload analysis

Efficient Origin-Destination Estimation Using Microscopic Traffic Simulation with Restricted Rerouting

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Computer Modeling in Engineering & Sciences 2023年第5期135卷 1091-1109页

作者： Kazuki Abe Hideki Fujii shinobu Yoshimura Vector Research Institute Inc.Shibuya-kuTokyo150-0002Japan School of Engineering The University of TokyoBunkyo-kuTokyo113-8656Japan

Traffic simulators are utilized to solve a variety of traffic-related *** such simulators,origin-destination(OD)traffic volumes as mobility demands are required to input,and we need to estimate *** authors regard an OD estimation as a bi-level programming problem,and apply a microscopic traffic simulation model to ***,the simulation trials can be computationally expensive if full dynamic rerouting is allowed,when employing multi-agent-based models in the estimation *** paper proposes an efficient OD estimation method using a multi-agent-based simulator with restricted dynamic rerouting to reduce the computational *** though,in the case of large traffic demand,the restriction on dynamic rerouting can result in heavier *** authors resolve this problem by introducing constraints of the bi-level programming problem depending on link *** results show that the accuracy of the link traffic volume reproduced with the proposed method is virtually identical to that of existing methods but that the proposed method is more computationally efficient in a wide-range or high-demand context.

关键词： ODestimation microscopic traffic simulation dynamic rerouting bi-level programming multi-agent basedmodel

A simulation-based study on longitudinal gust response of flexible flapping wings

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Acta Mechanica Sinica 2018年第6期34卷 1048-1060页

作者： Toshiyuki Nakata Ryusuke Noda shinobu Kumagai Hao Liu Graduate School of Engineering Chiba UniversityChiba 263-8522Japan Department of Mechanical Engineering Kanto Gakuin UniversityKanagawa 263-8501Japan

Winged animals such as insects are capable of flying and surviving in an unsteady and unpredictable aerial *** generate and control aerodynamic forces by flapping their flexible *** the dynamic shape changes of their flapping wings are known to enhance the efficiency of their flight,they can also affect the stability of a flapping wing flyer under unpredictable disturbances by responding to the sudden changes of aerodynamic forces on the *** order to test the hypothesis,the gust response of flexible flapping wings is investigated numerically with a specific focus on the passive maintenance of aerodynamic forces by the wing *** computational model is based on a dynamic flight simulator that can incorporate the realistic morphology,the kinematics,the structural dynamics,the aerodynamics and the fluid-structure interactions of a hovering *** longitudinal gusts are imposed against the tethered model of a hovering hawkmoth with flexible flapping *** is found that the aerodynamic forces on the flapping wings are affected by the gust,because of the increase or decrease in relative wingtip velocity or kinematic angle of *** passive shape change of flexible wings can,however,reduce the changes in the magnitude and direction of aerodynamic forces by the gusts from various directions,except for the downward *** adaptive response of the flexible structure to stabilise the attitude can be classified into the mechanical feedback,which works passively with minimal delay,and is of great importance to the design of bio-inspired flapping wings for micro-air vehicles.

关键词： Insect flight Flapping wing Flexible wing Gust response Fluid-structure interaction Mechanical feedback

A fate model of pathogenic viruses in a composting toilet based on coliphage inactivation

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Journal of Environmental Sciences 2011年第7期23卷 1194-1198页

作者： shinobu Kazama Narue Tameike Naoko Nakagawa Masahiro Otaki Department of Human Environmental Science Ochanomizu University INAX Co. 1-23-6 Yoshino-cho Kita-ku Satiama 331-0811 Japan Department of Civil and Environmental Engineering Tokyo Metropolitan University 1-1 Minamiosawa Hachioji City Tokyo 192-0397 Japan

A composting toilet using sawdust as a matrix has the potential to trap pathogens that might occasionally be contained in human feces. Therefore, care should be taken when handling the sawdust. It should also be noted that pathogenic viruses tend to have stronger tolerance than pathogenic bacteria. The fates of several species of coliphages, T4, λ, Qβ and MS2, in sawdust were investigated as a viral model. The fates of coliphages were significantly different among them, and they changed in response to temperature and the water content of the sawdust. As the results, T4 coliphage had the strongest tolerance and Qβ had the weakest one in sawdust. It was estimated the days required to decrease virus to a safe level based on a risk assessment. According to the rates of Qβ and T4, 15 days and 167 days were required respectively for a safe level of infection risk based on actually operated composting toilet condition. Thus, it was significantly different depending on the species and sawdust conditions.

关键词： composting toilet viral indicator coliphage risk assessment

Two-dimensional self-assembly of melem and melemium cations at pH-controlled aqueous solution-Au（111） interfaces under electrochemical control

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Frontiers of Chemical Science and Engineering 2016年第2期10卷 294-300页

作者： shinobu Uemura Kenki Sakata Masashi Aono Yusuke Nakamura Masashi Kunitake Department of Advanced Materials Sciences Faculty of Engineering Kagawa University Kagawa 761-0396 Japan Graduate School of Science and Technology Kumamoto University Kumamoto 860-8555 Japan

Two-dimensional self-assembly of melem at pH-controlled aqueous solution-Au（111） interfaces has been investigated by electrochemical scanning tunneling microscopy. In the solutions with pH 〉 pKbl of melem, two ordered self-assembled structures （honeycomb and close-packed structures） and one disordered fibrillar structure were observed as a function of the surface coverage ofmelem controlled by the electrode potential. In contrast, in the acidic solution with pH 〈 pKbl of melem, only the self-assembled honeycomb network was observed in a relatively wide potential range probably due to the presence of monoprotonated melem cations. Dots attrib- uted to counteranions were frequently observed in the pores of the honeycomb network. The lack of close-packed and fibrillar structures at low pH （〈 pKbl） is attributed to ionic repulsion of melemium cations.

关键词： self-assembly scanning tunneling micro-scopy electrochemistry structural phase transition melem

Wavelength-Dependent Transient Characteristics Caused by Gain Saturation in Highly Nonlinear Fiber-Based Raman Amplifiers

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光学学报 2003年第S1期23卷 417-418页

作者： shinobu Tamaoki Tetsufumi Tsuzaki Motoki Kakui Masayuki Shigematsu Sumitomo Electric Industries Ltd. 1 Taya-cho Sakae-ku Yokohama 244-8588 JapanSumitomo Electric Industries Ltd. 1 Taya-cho Sakae-ku Yokohama 244-8588 JapanSumitomo Electric Industries Ltd. 1 Taya-cho Sakae-ku Yokohama 244-8588 JapanSumitomo Electric Industries Ltd. 1 Taya-cho Sakae-ku Yokohama 244-8588 Japan

We have investigated the transient characteristics of discrete Raman Amplifiers and found that the response time caused by gain saturation is dependent upon the wavelength, which corresponds to the effective length of... 详细信息

关键词： by on length in Wavelength-Dependent Transient Characteristics Caused by Gain Saturation in Highly Nonlinear Fiber-Based Raman Amplifiers