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Antiferromagnetic Resonance in the Quasi-one-dimensional Magnet IPACu(ClxBr1−x)3 (x=0.83)
Takahito Fujita,Masayuki Hagiwara,Hirotaka Manaka 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have performed multi-frequency electron spin resonance (ESR) and magnetization measurementson single crystals of the quasi one-dimensional magnet IPACu(ClxBr1−x)3 (x=0.83) in magneticfields H along the b-axis at temperatures below an antiferromagnetic long-range orderingtemperature (TN ' 13 K). We observed some ESR branches for typical antiferromagnetic modeswith biaxial anisotropy at 1.5 K ( TN). We have analyzed the magnetization curve and the ESRexcitation modes for Hkb by using a two sub-lattice model and obtained good agreement betweenexperiment and calculation. In addition, we show that the origin of a field-induced magnetizationjump is a spin-flop transition. These results show that the phase at temperatures below TN in thisCl-Br mixed compound can be described as a simple two sub-lattice antiferromagnet.
( Takahito Chiba ),( Masakazu Takahara ),( Takeshi Nakahara ),( Shuji Fukagawa ),( Kenjiro Takei ),( Asuka Shono ),( Hiromaro Kiryu ),( Yoichi Moroi ),( Masutaka Furue ) 대한피부과학회 2012 Annals of Dermatology Vol.24 No.1
A 70-year-old woman with an 8-year history of systemic sarcoidosis developed round, red-brown eruptions, with central atrophic lesions on her lower legs. The features of the biopsy specimen resembled those of necrobiosis lipoidica (NL), but although necrobiosis was present there were well-formed non-necrotizing granulomas in the dermis. The histological diagnosis was cutaneous sarcoidosis. Systemic sarcoidosis presenting with NL has rarely been reported. The histological features of cutaneous sarcoidosis sometimes mimic those of other granulomatous diseases, including NL and granuloma annulare, which are difficult to distinguish. We discuss the novel association between sarcoidosis and other granulomatous diseases. (Ann Dermatol 24(1) 74∼76, 2012)
Takahito Mitsui,Yoji Aizawa 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.1I
In a previous study, the refractory-activation oscillator system (RAO system) was proposed to explain the crossbridge formation process in the actomyosin system. In this paper, the RAO system is analyzed to make clear how the geometrical structure of the actomyosin system affects its sliding dynamics and cooperative phenomena in the muscle contraction process. The geometrical structure is characterized by the spatial period ratio between myosin and actin filaments. First, the sliding velocity of the RAO model is shown to depend very sensitively on the period ratio, which we call velocity resonance. Next, the origin and the detailed aspects of the resonance are discussed based on the notion of maximum spacing between the relative equilibrium positions of myosin molecules. An important result is that the condition for the resonance depends not only on the period ratio but also on the number of myosin molecules (the system size N) because the width of each resonance zone changes by a law of O(N.1). This means that an appropriate value of the period ratio must be realized in order to accomplish a coherent sliding motion in the actomyosin system under the condition of a finite N.
Diagrammatic Representation of Environmental Monitoring Data
Yoshioka, Takahito,Sekino, Tatsuki The Korean Society of Limnology 2005 생태와 환경 Vol.38 No.S
The marked increase in the number of environmental problems, combined with the increase in their intensity and spatial extent, has resulted in an ever-increasing need for constant monitoring. This is complicated by the occurrence of new and complicated environmental issues that often prevent a thorough understanding of the entire monitoring framework. In the present study, a diagrammatic method was developed to present the entire framework of a monitoring plan. The diagram was separated into three sections- "Problem Section", "Research Process and Data Section" and "Entities Section" - to clearly present the disparate relationships between monitoring objectives and the monitoring procedure. Notation of the diagrams was undertaken using Unified Modeling Language (UML). A hypothetical monitoring plan for an environmental problem was designed to assess usefulness of the diagrammatic method. The diagram was capable of reviewing and revising the monitoring plan and could be used to select a monitoring procedure according to the monitoring objectives of the plan. The results suggested that this diagrammatic method was effective for designing an appropriate monitoring plan for a given monitoring objective.