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Study on the Realization of Zinc Point
J. V. Widiatmo,M. Sakai,K. Yamazawa,K. Satou,J. Tamba,M. Arai 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Two zinc-point cells were fabricated using high grade zinc samples, impurity elements of one of which were analyzed extensively. Temperature measurements during the solid-liquid coexistence, under which the zinc fixed-point is defined, were conducted, the result of which was used to perform a thermal analysis. Comparisons of zinc-point temperature realized within the newly fabricated cells were also conducted. Zinc-point depression due to impurity elements was calculated based on the chemical element analysis. Evaluation was made on the thermal analysis, the cell comparison results and the chemical element analysis, to lead to an estimation of uncertainty caused by the impurity elements. The present paper outlines the cell fabrication, the temperature measurements and the evaluation of impurity effect to the zinc-point realization.
Hinvi L. A.,Koukpémèdji A. A.,Monwanou V. A.,Miwadinou C. H.,Kamdoum Tamba V.,Chabi Orou J. B. 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.8
This paper addresses the dynamics of a position-dependent mass-driven Duffing-type oscillator (PDM oscillator) subjected to periodic excitation. The approximate equation of the PDM oscillator is considered to analyze the harmonic oscillations and the possible resonance states. The Amplitudes and frequencies of possible resonances are found by using the harmonic balance method and the multiple scales method. The harmonic resonance, primary resonance, order 3, 5 superharmonic resonances and order 3, 5 subharmonic resonances are obtained. The stability conditions for each of these resonances have also been obtained. Chaotic oscillations, multistability, hysteresis, and coexisting attractors have been found using the bifurcation diagram, the Lyapunov exponents, the phase portraits, and the basin of attraction. The effects of the PDM parameter ξ and of the external excitation have been analyzed. Results obtained by using the approximate equation of the system have been compared to the dynamics obtained with the exact equation of the PDM oscillator. The analytical investigations have been complemented and validated using the numerical simulations.