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New Analysis of Electrochemical Impedance Spectroscopy for Lithium-ion Batteries
Osaka, Tetsuya,Nara, Hiroki,Mukoyama, Daikichi,Yokoshima, Tokihiko The Korean Electrochemical Society 2013 Journal of electrochemical science and technology Vol.4 No.4
First of all, we express our deepest sympathies for the passing of Professor Su-Moon Park. In the present paper, an electrochemical impedance spectroscopy (EIS), which Professor Su-Moon Park also used frequently for the investigation of electroconducting polymer, is introduced as a recent evaluation tool for a commercially available lithium-ion battery (LIB). The paper surveys how to design equivalent circuits while explaining physical and chemical phenomena in the LIB and how to get more accurate impedance spectra with varying the measuring temperatures. Additionally, a square current EIS (SC-EIS) technique, which we have suggested, is introduced for the larger LIB system as a promising technique for the future.
Emissions of Volatile Organic Compounds from a Swine Shed
Nao Osaka,Akane Miyazaki,Nobuyuki Tanaka 한국대기환경학회 2018 Asian Journal of Atmospheric Environment (AJAE) Vol.12 No.2
The concentrations and chemical compositions of volatile organic compounds (VOCs), including volatile fatty acids, phenols, indoles, aldehydes, and ketones, which are the main organic compounds generated by swine, were investigated in July and October 2016 and January 2017. In addition, the emission rates and annual emissions of these components from the swine shed were estimated. The concentrations of VOCs in the swine shed averaged 511.3 μg m-3 in summer, 315.5 μg m-3 in fall and 218.6 μg m-3 in winter. Acetone, acetic acid, propionic acid, and butyric acid were the predominant components of the VOCs, accounting for 80-88% of the total VOCs. The hourly variations of VOC concentrations in the swine shed in fall and winter suggest that the VOC concentrations were related to the ventilation rate of the swine shed, the activity of the swine, and the temperature in the swine shed. Accordingly, the emission rates of VOCs from the swine shed were 1-2×103 μg (h kg-swine)-1.
LINEAR MAPS PRESERVING 𝓐𝓝-OPERATORS
Golla, Ramesh,Osaka, Hiroyuki Korean Mathematical Society 2020 대한수학회보 Vol.57 No.4
Let H be a complex Hilbert space and T : H → H be a bounded linear operator. Then T is said to be norm attaining if there exists a unit vector x<sub>0</sub> ∈ H such that ║Tx<sub>0</sub>║ = ║T║. If for any closed subspace M of H, the restriction T|M : M → H of T to M is norm attaining, then T is called an absolutely norm attaining operator or 𝓐𝓝-operator. In this note, we discuss linear maps on B(H), which preserve the class of absolutely norm attaining operators on H.