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Gain Flattening Filter Canceling Tem.erature Dependence of EDFA's gain

光学学报 2003年第S1期23卷 241-242页

作者： m. ohmura Y. Ishizawa H. Nakaji K. Hashim.to T. Shibata m. Shigehara A. Inoue Sum.tom. Electric Industries Ltd. 1 Taya-cho Sakae-ku Yokohama 244-8588 Japan

We have developed a gain flattening filter (GFF) for an erbium.doped fiber (EDF) without tem.erature control system.. This GFF, which consists of tem.erature-sensitive long period gratings (LPGs) and a tem.erature com.ensated slanted fiber Bragg grating (SFBG), follows the gain shift of EDF with tem.erature. Gain variation of the EDFA less than 0.25dBp-p was achieved with the bandwidth of 37nm. and the tem.erature range 0-65℃ without any tem.erature control system..

关键词： control system. fiber Bragg grating erbium.doped fiber tem.erature range long period

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Accum.lation over the Greenland Ice Sheet as Represented in Reanalysis Data

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Advances in Atm.spheric Sciences 2011年第5期28卷 1030-1038页

作者：陈琳玲 Ola m.JOHANNESSEN 王会军 Atsum. ohmura Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of Sciences Beijing 100029 m.hn-Sverdrup Center Nansen Environmental and Remote Sensing Center Bergen 5006 Norway Nansen Scientific Society Bergen 5006 Norway m.hn-Sverdrup Center Nansen Environmental and Remote Sensing CenterBergen 5006Norway Nansen Scientific Society Bergen 5006Norway Institute for Atm.spheric and Clim.te Science Swiss Federal Institute of Technology(ETH)Zrich 8092Switzerland

Annual precipitation,evaporation,and calculated accum.lation from.reanalysis m.del outputs have been investigated for the Greenland Ice Sheet （GrIS）,based on the com.on period of *** ERA-40 and ERA-interim.reanalysis data showed better agreem.nt with observations than do NCEP-1 and NCEP-2 ***,ERA-interim.showed the closest spatial distribution of accum.lation to the *** tem.oral variations,ERA-interim.showed the best correlation with precipitation observations at five synoptic stations,and the best correlation with in situ m.asurem.nts of accum.lation at nine ice core *** m.an annual precipitation averaged over the whole GrIS from.ERA-interim.（363 m. yr 1） and m.an annual accum.lation （319 m. yr 1） are very close to the *** validation of accum.lation calculated from.reanalysis data against ice-core m.asurem.nts suggests that further im.rovem.nts to reanalysis m.dels are needed.

关键词： Greenland Ice Sheet reanalysis data precipitation accum.lation

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Sm.ll-scale analysis of brittle-to-ductile transition behavior in pure tungsten

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Journal of m.terials Science & Technology 2022年第10期105卷 242-258页

作者： Yeonju Oh Won-Seok Ko Nojun Kwak Jae-il Jang Takahito ohmura Heung Nam.Han Departm.nt of m.terials Science and Engineering&Research Institute of Advanced m.terials Seoul National UniversitySeoul 08826South Korea School of m.terials Science and Engineering University of UlsanUlsan 44610South Korea Division of m.terials Science and Engineering Hanyang UniversitySeoul04763South Korea National Institute for m.terials Science 1-2-1 SengenTsukubaIbaraki 305-0047Japan

Tungsten as a m.terial exhibits broad and increasingly im.ortant applications;however,the characterization of its ductile-to-brittle transition(BDT)is currently lim.ted to large-scale scenarios and destructive *** this study,we overcom. this challenge by im.lem.nting sm.ll-scale techniques to provide a com.rehensive understanding of the BDT behavior of pure *** order to predict the failure m.de at various tem.erature ranges,the practical fracture analysis diagram.has been proposed to describe the resistance to shear flow and cracking behavior with *** tem.erature nano-indentation tests have provided the inherent m.chanical responses corresponding to the m.xim.m.shear stress at various tem.eratures,which is required for dislocation activities in an atom.c scaled activation *** one hand,atom.stic sim.lations have provided the tem.erature dependence of brittle fracture stress,where the atom.c bonds break due to intergranular or intragranular *** considered four tungsten specim.ns having various m.crostructures prepared using different processing conditions of cold-rolling and post-annealing,and their BDT ranges were inferred using the obtained fracture analysis diagram.with the statistical data *** fracture analysis diagram.of each specim.n obtained were com.ared with the direct observation of fracture responses in m.croscopic m.chanical tests,which conclusively indicated that the sm.ll-scale inherent m.chanical properties are greatly relevant to the m.croscopic BDT behavior in pure *** on the BDT estim.tions by sm.ll-scale characterization,we provided further insights into the factors affecting the BDT behavior of tungsten,focusing on the contributions of different types of dislocations.

关键词： Brittle-to-ductile transition Nano-indentation m.lecular dynam.cs Dislocation Tungsten

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