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Oxygen storage properties of hexagonal HoMnO<sub>3+δ</sub>
a,wierczek, Konrad,Klimkowicz, Alicja,Nishihara, Kengo,Kobayashi, Shuntaro,Takasaki, Akito,Alanizy, Maleeha,Kolesnik, Stanislaw,Dabrowski, Bogdan,Seong, Seungho,Kang, Jeongsoo The Royal Society of Chemistry 2017 Physical chemistry chemical physics Vol.19 No.29
<▼1><P>Structural and oxygen content changes of hexagonal HoMnO3+δ manganite at the stability boundary in the perovskite phase have been studied by X-ray diffraction and thermogravimetry using <I>in situ</I> oxidation and reduction processes at elevated temperatures in oxygen and air.</P></▼1><▼2><P>Structural and oxygen content changes of hexagonal HoMnO3+δ manganite at the stability boundary in the perovskite phase have been studied by X-ray diffraction and thermogravimetry using <I>in situ</I> oxidation and reduction processes at elevated temperatures in oxygen and air. The oxygen storage properties during structural transformation between stoichiometric Hex0 and oxygen-loaded Hex1 phases, transition temperatures and kinetics of the oxygen incorporation and release are reported for materials prepared by the solid-state synthesis and high-impact mechanical milling. Long-term annealing experiments have shown that the Hex0 (<I>δ</I> = 0) → Hex1 (<I>δ</I> ≈ 0.28) phase transition is limited by the surface reaction and nucleation of the new phase for HoMnO3+δ 15MM. The temperatures of Hex0 ↔ Hex1 transitions have been established at 290 °C and 250 °C upon heating and cooling, respectively, at a rate of 0.1° min<SUP>−1</SUP>, also indicating that the temperature hysteresis of the transition could possibly be as small as 10 °C in the equilibrium. Ball-milling of HoMnO3+δ has only a small effect on improving the speed of the reduction/oxidation processes in oxygen, but importantly, allowed for considerable oxygen incorporation in air at a temperature range of 220–255 °C after prolonged heating. The Mn 2p XAS results of the Mn valence in oxygen loaded samples support the oxygen content determined by the TG method. The magnetic susceptibility data of the effective Mn valence gave inconclusive results due to dominating magnetism of the Ho<SUP>3+</SUP> ions. Comparison of HoMnO3+δ with previously studied DyMnO3+δ indicates that a tiny increase in the ionic size of lanthanide has a huge effect on the redox properties of hexagonal manganites and that practical properties could be significantly improved by synthesizing the larger average size (Y,Ln)MnO3+δ manganites.</P></▼2>
Modeling of Autonomous Emergency Braking System with Minimum Jerk
A. S. P. Singh,O. Nishihara 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
Vehicle safety systems have been developed to reduce the numbers of accidents and fatalities. An autonomous emergency braking system is a vehicle safety system that automatically applies braking when a collision is imminent. This paper presents an autonomous emergency braking system with minimum jerk for improved occupant comfort. The tire-road friction constraint is considered in the generation of the minimum jerk trajectory. For this trajectory, the stopping distance is derived analytically. A simple controller was developed to track the desired velocity profile. The effectiveness of this controller was verified by computer simulations using a nonlinear vehicle dynamics model for dry and wet road surfaces.
Stereo Based Vision System for Cardiac Auscultation Tele-Diagnostic System
S. Kumpituck,W. Kongprawechnon,T. Kondo,K. Tungpimolrut,A. Nishihara 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper presents a stereo based vision system which will be used to determine the stethoscope locationon the human body in a cardiac auscultation tele-diagnostic system. The system is aimed at overcoming the problem ofinsufficient number of doctors comparing with the higher number of patients. The stereo vision system simulateshuman vision. The reconstruction of the point in three-dimensional space can be done by using the knowledge ofcamera calibration, image rectification, epipolar geometry, and disparity computation.
Lightcurve survey of V-type asteroids in the inner asteroid belt
Hasegawa, S.,Miyasaka, S.,Mito, H.,Sarugaku, Y.,Ozawa, T.,Kuroda, D.,Nishihara, S.,Harada, A.,Yoshida, M.,Yanagisawa, K.,Shimizu, Y.,Nagayama, S.,Toda, H.,Okita, K.,Kawai, N.,Mori, M.,Sekiguchi, T.,Is Astronomical Society of Japan 2014 Publications of the Astronomical Society of Japan Vol.66 No.3