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Schumann resonance observation in China and anomalous disturbance possibly associated with Tohoku m9.0 earthquake

Earthquake Science 2013年第2期26卷 137-145页

作者： Xinyang Ouyang Xuemin Zhang A.P.Nickolaenko m.hayakawa Xuhui Shen Yuanqing miao Institute of Earthquake Science China Earthquake Administration63 Fuxing RoadP.O.Box 166 Beijing 100036China School of Earth and Space Sciences Peking University Usikov Institute of Radiophysics and Electronics hayakawa Institute of Seismo Electromagnetics Co. Ltd. UEC Incubation Center1-5-1 Chofugaoka Chofu Tokyo 182-8585Japan DFH Satellite Co. Ltd.China Academy of Space Technology

Schumann resonance （SR） is an electromag- netic resonance phenomenon in the Earth-ionosphere cavity exited by global lightning activities when the wavelength matches the circumference of the Earth, and the lowest four peak frequencies of SR are about 8, 14, 20, and 26 Hz. This article presents the new observational data of SR in China. The observations of two horizontal mag- netic components （BNs and BEw） in the frequency band range of 3-29 Hz at Yongsheng observatory （26.7°N, 100.8°E） in southwestern China were mainly analyzed. It is found that the SR amplitudes at peak frequencies in BNs and BEw components all showed diurnal and seasonal variations, and that the SR amplitude in BNS component is always higher than that in BEw component. Diurnal vari- ation of SR amplitude around equinoxes and solstices inBNs component is related to active intervals of three global thunderstorm centers, while SR amplitude in BEw com- ponent is the most significant at around 16 LT, corre- sponding to Asian center. SR amplitudes both in BNs and BEw components increase in the rainy season from may to September. In addition, the SR anomalies in association with the 2011 Japan earthquake are exhibited. The anom- alous effect was characterized by an increase in amplitude at the lowest four SR modes beginning at 4 days before this earthquake. Upon analyzing the wave interference between the direct wave and disturbed wave scattered by localized modification of lower ionosphere over the epicenter, Asian and African thunderstorm centers are found to contribute to anomalous effect observed at Yongsheng station. modeling results of SR regular and disturbed spectra at different local times led to the similar conclusion.

关键词： Schumann resonance amplitudeThunderstorm center Anomalous Schumannresonance

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HIGH CYCLE FATIGUE PROPERTIES OF NICKEL-BASE ALLOY 718

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Acta metallurgica Sinica(English Letters) 2004年第4期17卷 345-349页

作者： K.Kobayashi K.Yamaguchi m.hayakawa m.Kimura National Institute for materials Science Tsukuba Ibaraki 305-0047 JapanNational Institute for Materials Science Tsukuba Ibaraki 305-0047 JapanNational Institute for Materials Science Tsukuba Ibaraki 305-0047 JapanNational Institute for Materials Science Tsukuba Ibaraki 305-0047 Japan

The fatigue properties of nickel-base Alloy 718 with fine- and grain-coarse grains were investigated. In the fine-grain alloy, the fatigue strength normalized by the tensile strength was 0.51 at 107 cycles. In contrast, the fatigue strength of the coarse-grain alloy was 0.32 at the same cycles, although the fatigue strengths in the range from 103 to 105 cycles are the same for both alloys. The fracture appearances fatigued at around 106 cycles showed internal fractures originating from the flat facets of austenite grains for both alloys. The difference in fatigue strength at 107 cycles between the fine- and coarse-grain alloys could be explained in terms of the sizes of the facets from which the fractures originated.

关键词： aerospace material fatigue high temperature internal fracture,facet

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SEISmO ELECTROmAGNETICS（LATEST RESULTS OF NASDA’S EARTHQUAKE REmOTE SENSING FRONTIER PROJECT）

SEISMO ELECTROMAGNETICS（LATEST RESULTS OF NASDA’S EARTHQUA...

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2002 3rd International Symposium on Electromagnetic Compatibility

作者： m.hayakawa O.A.molchanov Dept.of Electric Engineering The Univ.of Electro-Communications1-5-1 ChofugaokaChofu-shiTokyo 182-8585Japan Institute of the Physics of the Earth Russian Academy of Sciences10Bolshaya Gruzinskaya123995Moscow D-424Russia

＜正＞NASDA（National Space Development Agency of Japan） has been conducting the Earthquake Remote Sensing Frontier Project since 1996 within the framework of the Earthquake Frontier Projects（for which the author is the principal scientist） by S.T.A.（Science and Technology Agency）.main emphasis of NASDA’s Frontier Project is the complete understanding of lithosphere-atmosphere-ionosphere（LAI） coupling by means of different kinds of observational items and finally we would like to contribute to the short-term earthquake *** show our latest results on different subjects（subionospheric VLF/LF propagation,ULF emission etc.）

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电离层离子丰度对哨声传播经度效应的影响

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空间科学学报 1990年第3期10卷 197-203页

作者：周怀北徐继生梁百先保宗悌 m.hayakawa 中国科学院空间科学与应用研究中心武汉大学空间物理系日本名古屋大学空电研究所

Iss-b卫星探测结果表明,|电离层离子丰度呈现经度变化.本文选取较真实的电离层模型参数,对130°E和114°E两个子午面内传播的低纬哨声进行了射线跟踪.我们发现,由于[O^+],[He^+]和[H^+]决定的电子浓度垂直梯度的经度变化,导致哨声传播... 详细信息

Iss-b卫星探测结果表明,|电离层离子丰度呈现经度变化.本文选取较真实的电离层模型参数,对130°E和114°E两个子午面内传播的低纬哨声进行了射线跟踪.我们发现,由于[O^+],[He^+]和[H^+]决定的电子浓度垂直梯度的经度变化,导致哨声传播特性的经度效应,使得130°E比114°E内传播的低纬哨声更好地满足透射条件:|μsinδ|≤1.与电子浓度的水平梯度的影响比较,离子丰度决定的电子浓度垂直梯度随经度的变化使哨声传播产生的经度效应明显得多.武昌(地理30.5°N,114.6°E;地磁19.3°N).和鹿儿岛(31.5°N,130.8°E;20.5°N)两台站观测到的哨声出现率的经度效应证实了本文的理论预言.

关键词：电离层哨声传播离子丰度经度

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测量非晶态合金的小磁致伸缩的简易仪器

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中国检验检测 1985年第6期 46-49页

作者： m.hayakawa 饶怡媛

一、前言磁性料材的磁致伸缩系数通常是用应变仪来测量的。为了避免磁阻效应,要选择合适的应变仪,应变仪的灵敏度可达到1×10。然而,对于薄的样品,如在某一范围内呈现近似零的磁致伸缩系数的非晶带,消除样品和应变

关键词：各向异性场非晶合金电磁场金属玻璃精密合金饱和磁化强度退磁场退磁因子磁致伸缩 Joule效应仪器

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Erratum to:Schumann resonance observation in China and anomalous disturbance possibly associated with Tohoku m9.0 earthquake

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Earthquake Science 2014年第3期27卷 353-353页

作者： Xinyan Ouyang Xuemin Zhang A.P.Nickolaenko m.hayakawa Xuhui Shen Yuanqing miao Institute of Earthquake Science China Earthquake Administration School of Earth and Space Sciences Peking University

Erratum to:Earthq Sci(2013)26(2):137–145DOI 10.1007/s11589-013-0009-0In the published article,first author’s name was *** correct name appears in this erratum.

关键词： Erratum to

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与地震有关的电离层扰动的甚低频/低频无线电探测

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世界地震译丛 2009年第2期40卷 53-64页

作者： m. hayakawa 马君钊（译）张磊（校）陈化然（复校）不详天津市地震局

近期人们认识到,电离层对地震影响非常敏感,探测与地震有关的电离层扰动看来对地震短临预测是非常有前途的。我们提出可利用甚低频/低频(3～30kHz/30～300kHz)无线电探测进行地震—电离层扰动的探测。1995年神户地震明显发现电离层扰动... 详细信息

近期人们认识到,电离层对地震影响非常敏感,探测与地震有关的电离层扰动看来对地震短临预测是非常有前途的。我们提出可利用甚低频/低频(3～30kHz/30～300kHz)无线电探测进行地震—电离层扰动的探测。1995年神户地震明显发现电离层扰动现象之后,开始了利用低电离层甚低频/低频传播信号进行地震短临预测的简短历史。在说明先前的甚低频/低频结果之后,我们给出了最新的甚低频/低频发现:一个是电离层扰动与地震在统计上相关,第二个是2004年12月苏门答腊地震的实例研究,说明了这次地震电离层扰动的空间尺度和动力学原理。

关键词：电离层扰动甚低频/低频无线电探测地震预测

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与地壳活动有关的ULF地磁变化:RIKEN-NASDA项目概要和最新结果

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世界地震译丛 2005年第3期36卷 50-53页

作者： K．Hattori I．Takahashi m.hayakawa N．Isezaki K．Yumoto T．Nagao S．Uyeda 李琪杨冬梅不详中国地震局地球物理研究所

尽管地震短临预报极其重要,并且经过了人们多年的努力,但它仍是目前未能解决的问题。近年来,与地震相关的电磁现象被认为是解决地震短临预报的有效途径之一。现在已经积累了大量的地震电磁前兆信号的震例,这些信号分布在很宽的频带范围(... 详细信息

尽管地震短临预报极其重要,并且经过了人们多年的努力,但它仍是目前未能解决的问题。近年来,与地震相关的电磁现象被认为是解决地震短临预报的有效途径之一。现在已经积累了大量的地震电磁前兆信号的震例,这些信号分布在很宽的频带范围(DC-VHF)内,其中ULF地磁变化是最有希望的地磁前兆之一。通过监测ULF地磁变化,有望实现地震短临预报。本文将阐述从ULF电磁信号中提取震磁异常变化的方法。

关键词：地磁变化 ULF 地壳活动地震短临预报概要项目电磁现象前兆信号信号分布地磁前兆异常变化电磁信号震例震磁

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Influence of cerium ions on structure-dependent magnetic properties of Ba-Sr m-type hexaferrite nanocrystals

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Journal of Rare Earths 2024年第2期42卷 364-372,I0005页

作者： Ram A.Pawar Sunil m.Patange P.m.Dighe Sher Singh meena Abdullah GAl-Sehemi mehboobali Pannipara Santosh S.Jadhav Department of Physics ArtsCommerce and Science CollegeAhmednagar413711MaharashtraIndia Department of Physics Shri Krishna MahavidyalayaGunjotiDistOsmanabad413606MaharashtraIndia Padmashri Vikhe Patil College of Arts Science and CommercePravaranagarA/P.Loni(Kd)Tal.RahataDistAhmednagar413713MaharashtraIndia Solid State Physics Division Bhabha Atomic Research CentreMumbai400085MaharashtraIndia Department of Chemistry King Khalid UniversityAbha61413Saudi Arabia Department of Physics D.S.M's ArtsCommerce and Science CollegeJintur431509MaharashtraIndia

The present study is a systematic effort to investigate the structure-sensitive magnetic parameters of Ce^(3+) substituted Ba-Sr hexaferrite nanocrystals chemically formulated as Ba_(0.5)Sr_(0.5)Ce_(x)Fe_(12-x)O_(19) where x=0.0-0.2 with Δx=*** hexaferrite powders were prepared using the sol-gel self-ignition route and structurally characterized by means of powder X-ray diffraction and Fourier transform infrared *** creation of the m-type hexaferrite phase within the synthesized samples was revealed from the Rietveld refinement of the X-ray *** occurrence of a secondary phase of CeO_(2) was revealed within the hexaferrites for the substitution,x> *** refined X-ray diffraction data were utilized to compute the lattice parameters,X-ray density,and lattice parameter *** crystal structure plotted from the refined XRD data reveals the occupancy of the ions at different lattice *** XPS data of the hexaferrite were analyzed to confirm the oxidation states of the constituent *** nanocrystalline nature of the hexaferrites was revealed from the crystallite sizes calculated using Scherer's *** analysis of FTIR spectra confirms that only a fraction of Ce^(3+)accommodated in the lattice and the remaining Ce content reside in the form of the CeO_(2) *** morphology of the hexaferrites was analyzed from the FESEm profiles of the ferrite *** magnetic behavior study was performed by analyzing the Curie temperature,hysteresis loops,and hyperfine interactions by means of susceptibility,V.S.m,and mossbauer spectroscopy,*** hexaferrites with increasing coercivity,decreasing saturation magnetization,and decreasing Curie temperature are reported in the *** substituted Ce^(3+)ions inhibit the grain growth and create lattice imperfections giving rise to hexaferrites with tuned magnetic parameters suitable for different applications.

关键词： Ba-Sr hexaferrite Ce^(3+)substitution XPS Saturation magnetization Coercivity m?ssbauer spectroscopy

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Frequency-dependent viscoelasticity effects on the wave attenuation performance of multi-layered periodic foundations

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Applied mathematics and mechanics(English Edition) 2024年第3期45卷 407-424页

作者： m.SAFI m.VAKILIFARD m.J.mAHmOODI Faculty of Civil Water&Environmental EngineeringShahid Beheshti UniversityTehran ***Iran Faculty of mechanical and Energy Engineering Shahid Beheshti UniversityTehran ***Iran

In this paper,layered periodic foundations(LPFs)are numerically examined for their responses to longitudinal and transverse modes in the time and frequency *** different unit-cells,i.e.,2-layer,4-layer,and 6-layer unit-cells,comprising concrete/rubber,concrete/rubber/steel/rubber,and concrete/rubber/steel/rubber/lead/rubber materials,respectively,are taken into ***,the viscoelasticity behavior of the rubber is modeled with two factors,i.e.,a frequency-independent(FI)loss factor and a linear frequency-dependent(FD)loss *** the extraction of the complex dispersion curves and the identification of the band gaps(BGs),the simulations of wave transmission in the time and frequency domains are performed using the COmSOL *** parametric studies evaluate the effects of the rubber viscoelasticity models on the dispersion curves and the wave transmission for the longitudinal and transverse *** results show that considering the rubber viscoelasticity enhances the wave attenuation ***,the transverse-mode damping is more sensitive to the viscoelasticity model than its longitudinal *** 6-layer unit-cell LPF exhibits the lowest BG,ranging from 4.8 Hz to 6.5 Hz.

关键词： layered metamaterial periodic foundation complex dispersion curve wave transmission diagram

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