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Introduction of Functional Safety into the Field of Maintenance and Preventive Maintenance
Masami HASEGAWA 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Ten years have passed since the functional safety standard was issued, and it has extended to a lot of fields including the safety system of the plant. Recently, operation based on a quantitative risk analysis has been required as part of the safety lifecycle also in the field of maintenance and the preventive maintenance. In this paper, it meets the functional safety technology of IEC 61508, and relations of the technology and the theory to the maintenance field are analyzed. At the end introduces how to tackle maintenance in future.
Multi-frequency ESR in EuFe2As2
Masami Ikeda,Masayuki Hagiwara,Tatsuya Kobayashi,Wataru Hirata,Shigeki Miyasaka,Setsuko Tajima 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have performed multi-frequency electron spin resonance (ESR) measurements on EuFe2As2,which is one of the parent compounds of Fe-based superconductors. At TSDW=190 K, this compoundshows a spin-density-wave (SDW) transition. At temperatures above TSDW, the relaxationof Eu2+ spins takes place via the coupling of conduction electrons, resulting in a Korringa-type increasein the linewidth. At temperatures below TSDW, however, this compound shows an anisotropictemperature-independent linewidth except at temperatures near the long-range ordering temperature(19 K) of Eu2+ spins, giving evidence for a gap opening at TSDW. This change of physicalproperties indicates a change in the exchange interaction between localized Eu2+ spins and conductionelectrons in the FeAs layers. We evaluate the exchange constant, which was not reported inprevious X-band ESR studies, and compare it with the value for another Eu metallic compound.