Search Results 1-20 of 52648

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Synthesis of Noble Metals and Their Alloy Nanoparticles by Laser-induced Nucleation in a Highly Intense Laser Field

Nakamura Takahiro , Yamazaki Yuki , Sato Shunichi

… Femtosecond laser pulses with an energy on the order of mJ were tightly focused to create an intensity of 1014 W/cm2 … This laser-induced nucleation method can be performed without any reducing agents. …

KONA Powder and Particle Journal, 2022

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2

Estimation of maximum Bio-coke compressive strength based on chemical composition

TAGAMI-KANADA Nami , MIZUNO Satoru , CHERDKEATTIKUL Supitchaya , IDA Tamio

… Bio-coke has been proposed as an alternative energy source to coal due to its high density and compressive strength. … Bio-coke is produced by subjecting wood biomass to the hot press method, and the softening properties of hemicellulose and lignin in the raw biomass affect the formation, physical and mechanical characteristics of Bio-coke. …

Mechanical Engineering Journal, 2021

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3

Thermal Fatigue Life Prediction of BGA Solder Joints Using a Creep Constitutive Equation Incorporating Microstructural Coarsening Effect

Morooka Kouichi , Kariya Yoshiharu

… A thermal fatigue life prediction method is proposed for Sn–Ag–Cu solder joints that incorporates the effect of creep strength reduction due to microstructural coarsening of the solder during thermal cycling. … The proposed method was used to predict the thermal fatigue life of solder joints in a BGA (ball grid array) semiconductor package. …

MATERIALS TRANSACTIONS, 2021

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4

Scheduling Method of Microgrids' Operation Considering Uncertainty in Values of Forecasted Net Load [in Japanese]

Goto Ryota , Takano Hirotaka , Asano Hiroshi

… In the problem framework, we need to set an appropriate reserve power against the uncertainty in forecasted values of the electric power demand and the output of variable renewable energy-based generation systems. … This paper presents a problem framework and its solution method to make an aggregated schedule of operation of controllable components in microgrids and electricity trade with electricity market. …

Journal of Japan Society of Energy and Resources 42(1), 11-17, 2021

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5

Field Experiment of Smartphone-based Energy Efficiency Services for Households: a Proposal of Personalization Method for Neighborhood Comparison [in Japanese]

Nakano Kazuyoshi , Nishio Ken-ichiro , Mukai Toshihiro , Odate Yoko , Sasaki Masanobu

… We propose a method for personalizing neighborhood comparisons towards improving energy efficiency services. … The method uses a regression model considering attributes of households, whose prediction can be regarded as electricity consumption for similar neighborhoods. … The method is implemented in a field experiment based on a smartphone-based service. …

Journal of Japan Society of Energy and Resources 42(1), 18-29, 2021

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6

Topology optimization of transient response problems using step by step integration method (Formulation of analytical sensitivity with displacement as an unknown quantity and synthesis of vibration control structure) [in Japanese]

OGAWA Shun , YAMADA Takayuki

… In this study, we propose a topology optimization method for dynamic problems to control the deformation of the structure. … To derive a structure that minimizes the deformation due to transient loads for an isotropic linear elastic model, the strain energy and the squared norm of dynamic compliance are set as objective functions. … The topology optimization method applies a density method based on the RAMP method. …

Transactions of the JSME (in Japanese), 2021

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7

Investigation on Polishing of Zirconia Ceramics Using Magnetic Compound Fluid: Relationship Between Material Removal and Surface Roughness

Feng Ming , Wang Youliang , Wu Yongbo

… Zirconia ceramics have excellent applicability in the aerospace, defense, new energy, automotive, electronics, and biomedical fields. … In this work, a polishing method using a magnetic compound fluid slurry is proposed. … of 55 nm was obtained at the surfaces of zirconia ceramics, confirming that the proposed method has the potential for polishing of zirconia ceramics. …

International Journal of Automation Technology 15(1), 17-23, 2021

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8

Investigation on Feasibility of Polishing Concave Surfaces Using Magnetic Compound Fluid Slurry

Feng Ming , Xie Yingrui , Chen Leran , Wu Yongbo

… Magnetic assisted polishing is a promising method that can be used to meet the high standard of surface quality required. … Subsequently, a polishing experiment was conducted to investigate the feasibility of this polishing method. … were obtained for both areas, and this method was demonstrated to be capable of polishing concave surfaces and worthy of further research. …

International Journal of Automation Technology 15(1), 34-40, 2021

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9

A Study on Chatter Vibration Suppression by Bringing a Damping Beam into Contact with Workpiece:- Chatter Vibration Suppression in Cutting Workpiece with Low Stiffness - [in Japanese]

YOSHIDA Yuta , TAKANO Masahiro , MIYAKAWA Hiroyasu , HIROSAKI Kenichi

… By this method, following results are obtained. … Workpiece dampening could be improved using a damping beam with spring constant that maximizes strain energy of beam and modal damping ratio of vibration mode. …

Journal of the Japan Society for Precision Engineering 87(1), 146-150, 2021

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10

Optimization of Ion Thruster Grids Using JIEDI Code with Genetic Algorithm

INOUE Atsumu , YAMAMOTO Naoji , NAKAMURA Yusuke , NAKANO Masakatsu

… As a way to address this problem, this paper provides a method of designing grids using numerical simulation with a genetic algorithm. …

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 19(1), 75-80, 2021

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11

Study on Hypersonic Aero- and Aerothermo-Dynamic Characteristics of Natural Atmospheric Entry Object

DONG Zipei , SUZUKI Kojiro

… Based on the constructed shape model, the surface pressure distribution is calculated by the Newtonian method, as well as the force and moment coefficients by pressure integration over the surface. …

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 19(1), 87-95, 2021

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12

Effect of change factors on evaporation loss based on cold end system in natural draft counter-flow wet cooling towers

YUAN Wei , SUN Fengzhong , LIU Ruqing , CHEN Xuehong , LI Ying

… Based on Merkel method, the Merkel number is revised in consideration of the effect of water loss. …

Journal of Thermal Science and Technology 16(2), JTST0015-JTST0015, 2021

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13

Control and Experimental Verification of a Bidirectional Non-isolated DC-DC Converter Based on Three-level Flying-Capacitor Converters

Tesaki Kazuaki , Ishida Yuji , Hagiwara Makoto

… This paper presents a current control method based on dq0 transformation and a voltage control method for the floating dc capacitors used in the auxiliary converters. …

IEEJ Journal of Industry Applications 10(1), 114-123, 2021

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14

Investigation of fluoride layer of yttria coatings prepared by aerosol deposition method

ASHIZAWA Hiroaki , YOSHIDA Katsumi

… coatings prepared by aerosol deposition (AD) method compared with Y2O3 …

Journal of the Ceramic Society of Japan 129(1), 46-53, 2021

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15

Effect of chemical composition on mass transfer in Y2Ti2O7 under oxygen potential gradient at high temperatures

TANAKA Makoto , MATSUDAIRA Tsuneaki , KAWAI Emi , KAWASHIMA Naoki , MATSUMOTO Ushio , OGAWA Takafumi , TAKEUCHI Miyuki , KITAOKA Satoshi

… The oxygen permeability constants for YT increased dramatically with a slight increment in the Y/Ti molar ratio, and the activation energy for oxygen permeation markedly decreased. … The diffusion path for oxide ions in the crystal at high temperature was also investigated based on a spatial distribution map described by the bond valence sum method. …

Journal of the Ceramic Society of Japan 129(1), 22-31, 2021

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16

Driving an Open-Winding Structure PMSM Using Third Harmonic Current Control [in Japanese]

Honda Kazunari , Akatsu Kan

… A harmonic current control method has been used as a controllable approach for realizing its low vibration of PMSMs. …

IEEJ Transactions on Industry Applications 141(1), 39-45, 2021

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17

Operation Point Decision Method for Improvement of Regenerative Efficiency in Power Generation System Using Helical Motor [in Japanese]

Makimura Ayame , Koyama Masato

… Due to the estimated ocean-wave power capacity is large, wave power generations are one of the promising renewable energy. … Then, from the numerical and theoretical analysis, the proposed control and design method were discussed. … From this discussion, it can conclude the proposed design method can predict the existence range of the optimal damper gain. …

IEEJ Transactions on Electronics, Information and Systems 141(1), 68-75, 2021

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18

Method of Predicting for Charge Voltage Due to Ion Flow on Insulated Wire with Grounded Core Conductor under HVDC Overhead Transmission Line [in Japanese]

Shiina Takeo , Miyajima Kiyotomi

Conductive objects insulated from the ground under DC transmission lines are electrified by the flow of ions supplied by corona discharge on the surface of the line conductor. The charge volt …

IEEJ Transactions on Power and Energy 141(1), 13-20, 2021

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19

A Shunt Capacitor Equipped with a Series Inverter for Compensating Harmonics along with Existing Equipment [in Japanese]

Sano Kenichiro , Leandro Guilherme Cirilo , Okada Naotaka

… This paper proposes a novel control method for the shunt capacitor equipped with a series inverter (ISC) in order to use with existing shunt capacitors in parallel. … The proposed method controls the equivalent impedance of the ISC in the normal operation range to be equal to the conventional shunt capacitors equipped with a series inductor (LSC). …

IEEJ Transactions on Power and Energy 141(1), 27-35, 2021

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20

Probabilistic Supply and Demand Balance Control Method based on Electricity Market Mechanism Considering N-1 Criterion [in Japanese]

Koide Akira , Tsuji Takao , Tanaka Kazuyuki , Sugimoto Hitoshi

… To solve energy and environmental issue, Variable Renewable Energy (VRE) has been greatly promoted and power flow in transmission system becomes more uncertain due to VRE output fluctuation. … The effectiveness of the proposed method was verified through numerical simulation using modified IEEE New England 39 bus system model with taking into account bidding curves of both suppliers and customers. …

IEEJ Transactions on Power and Energy 141(1), 1-12, 2021

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