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Cathode Property of Na_2C_xO_x [x = 4, 5, and 6] and K_2C_6O_6 for Sodium-ion Batteries
No full textSodium-ion batteries now become a strong alternative candidate for lithium-ion batteries due to abundant Na resources, and organic electrode active materials for sodium-ion batteries also have possibility to bring additional cost reduction. Although many organic-based active materials have been researched as cathode materials for lithium-ion batteries, few works have been conducted for sodium-ion batteries. In this study, the cathode properties of several organic compounds of sodium rhodizonate analogs, Na_2C_xO_x [x = 4 and 5] and K_2C_6O_6 were newly investigated. Among them, it was revealed that Na_2C_5O_5 and Na_2C_6O_6 deliver large first discharge capacity close to 200 mAh g_-1 and exhibit reversible sodium insertion/de-insertion of 1.35 and 1.25Na, respectively, with good cycle performance
Improvement of Electric Conductivity of Non-graphitizable Carbon Material via Breaking-down and Merging of the Microdomains
No full textHighly graphitized carbon with high electric conductivity was successfully prepared from non-graphitizable carbon (NGC) via breaking-down and merging of boundaries of microdomains through the potassium hydroxide (KOH) treatment and subsequent graphitization. After the graphitization at 2800℃, the KOH-treated sample showed modified domains having merged boundaries between the microdomains which could be observed in graphitizable carbon (GC). Such a domain-modified carbon showed less than half electric resistivity of graphitized NGC, indicating that macroscopic properties, such as electric conductivity, of carbon materials can be improved via the modification of nanometer-scale microdomain and domain structures
Implementation of Unstructured Multi-dimensional THINC for Practical Multi-Phase Flow Simulations
No full textThis work presents an application of the Unstructured Multi-dimensional Tangent Hyperbolic Interface Capturing (UMTHINC), volume of fluid, scheme for the multi-phase solution of free surface flows on unstructured mesh. The applicability of the UMTHINC to practical engineering problems with interfacial multiphase flow is investigated and the accuracy of the results are reported. The UMTHINC is integrated into an in-house unstructured incompressible flow solver and used as an engine to capture the moving interface. The well-known dam break problems with and without an obstacle are used to evaluate the accuracy and performance of the scheme. This work is limited to two dimensional cases with no turbulence modeling. The relationship between the sharpness parameter β, and CFL number is examined and reported. The results are well analyzed and compared to experimental data wherever possible. The results show that the UMTHINC interface capturing method is able to accurately capture the interface without the complexity and computation cost of the geometrical reconstruction method
System Identification and Adaptive Control of Mass-Varying Quad-Rotor
No full textModelling, system identification and the controller for variable length quad-rotors are presented in this paper. Modelling was derived using Newton-Euler method, then small disturbance theory was used for linearization. Plackett’s algorithm was used for system identification to predict the system parameters. Mass-varying problem is the main objective of this paper, and the effect of changing the system parameters was discussed in detail. The system parameters are updated in real-time during flight with low sample time. The PID-Accelerator controller of the quad-rotor was updated also in real-time based on the change of the system identification output. The attitude and altitude control of the quad-rotor were presented using an adaptive classical controller. Now the tethered mass-varying quad-rotor can be simulated. The objective of this work is to make the quad rotors fly for long time and to be robust for variable inputs comes from the tether. The simulation results of the system identification and control responses of the attitude and altitude are presented in this paper. The disturbance of the wind was also considered in the controller design
Development of Solvent-Cut Large-Volume Injection System using Deans Switch Type SilFlow for Dioxin Determinations in Blood
No full textWe developed solvent-cut large-volume injection system (SCLV) using Deans switch type SilFlow in dioxins measurement of human blood. The SilFlow worked in the same mechanism as the conventional SCLV for dioxins measurement, showed high reproducibility in dioxins measurement of the standard solution and the control sample. Since the SilFlow has very small dead volume as compared with the conventional method, the influence of contamination is small, and the handling is easy. In this study, we proved that SilFlow is available for an alternative to SCLV in blood dioxins analysis
連立型反応拡散セル・オートマトンの進行波
No full text応用力学研究所研究集会報告No.28AO-S6「非線形波動研究の深化と展開」Reports of RIAM Symposium No.28AO-S6 Deepening and expansion of nonlinear wave scienceProceedings of a symposium held at Chikushi Campus, Kyushu Universiy, Kasuga, Fukuoka, Japan, November 3 - November 5, 2016多成分のセル・オートマトンの中で基本的と考えられるセル・オートマトンとして「連立型反応拡散セル・オートマトン」を提案し，エレメンタリー・セル・オートマトンとの関係を述べる．連立型反応拡散セル・オートマトンに現れる進行波について調査結果を報告する
超離散パーマネントとMax Plus 線形方程式
No full text応用力学研究所研究集会報告No.28AO-S6「非線形波動研究の深化と展開」Reports of RIAM Symposium No.28AO-S6 Deepening and expansion of nonlinear wave scienceProceedings of a symposium held at Chikushi Campus, Kyushu Universiy, Kasuga, Fukuoka, Japan, November 3 - November 5, 2016Max Plus の連立線形方程式から変数を消去しようとすると、方程式が極端に複雑になってしまう事が多い。ここでは、あるクラスのMax Plus 線形方程式では、その様な複雑化が起らず、可解条件を超離散パーマネント(Max Plus での行列式) を使って簡潔に表せる事を示す