The pearlite transformation in a Mo-containing iron alloy was investigated under 12 T magnetic field. The pearlite transformation was accelerated owing to the application of a strong magnetic field. Pearlite was of de...The pearlite transformation in a Mo-containing iron alloy was investigated under 12 T magnetic field. The pearlite transformation was accelerated owing to the application of a strong magnetic field. Pearlite was of degenerated morphology without the presence of a strong magnetic field; but the degeneracy of pearlite is reduced when a strong magnetic field was applied, which may be attributed to the effect of strong magnetic field on faster carbon diffusion and less molybdenum segregation caused by a strong magnetic展开更多
By analyzing seismograms of short period records at the Beijing SeismoJogicaJ Observatory, the present paper investigates the amplitude ratio of seismic phases. The results indicate that the amplitude ratio of Sn/Lg i...By analyzing seismograms of short period records at the Beijing SeismoJogicaJ Observatory, the present paper investigates the amplitude ratio of seismic phases. The results indicate that the amplitude ratio of Sn/Lg is correlated with the lithosphere structure, the thermal state, and strong earthquake occurrence in the region the seismic rays pass through. The significance of such a correlation in the study on the genesis and prediction of strong earthquakes is discussed.展开更多
The notion of equivalent dispersion of strong seismic waves is further illuminated and a frequency-dependentstochastic model of the Fourier phase of strong earthquake ground motion is presented for use in statistical ...The notion of equivalent dispersion of strong seismic waves is further illuminated and a frequency-dependentstochastic model of the Fourier phase of strong earthquake ground motion is presented for use in statistical estimates of the Fourier phase. The non-stationary features of design ground motions synthesized using the phasemodel in combination with the empirical attenuation model of amplitude spectra of strong ground motion are ableto be consistent with those of observed records in the sense of statistics.展开更多
基于NCEP再分析资料、EC资料和常规观测资料,应用天气分析和诊断分析方法,对2016年1月广西的低温雨雪天气进行了分析,结果表明:(1)此次低温雨雪天气与阻塞高压的强而稳定密切相关。冷空气之强盛为历史所罕见,与历史同期相比,地面冷高压...基于NCEP再分析资料、EC资料和常规观测资料,应用天气分析和诊断分析方法,对2016年1月广西的低温雨雪天气进行了分析,结果表明:(1)此次低温雨雪天气与阻塞高压的强而稳定密切相关。冷空气之强盛为历史所罕见,与历史同期相比,地面冷高压显著偏强,850 h Pa的0℃线明显偏南。850 h Pa华南强锋区的长时间维持,是造成此次过程的重要原因之一。(2)雨夹雪与雪的条件相似,主要是温度垂直结构存在差异;而降雪与降雨相比,温度垂直结构、云顶高度、逆温层顶部气温以及暖层的厚度、高度、强度、地面气温均有明显的区别。(3)降水相态由雨转为雪时,广西上空的锋面垂直结构有明显的变化。(4)持续而强盛的水汽输送、湿层深厚有利于阴雨、雪天气的发生及持续。相关分析结论可为广西低温雨雪冰冻预报提供技术参考。展开更多
基金support for this research from State Ministry of Education (No.NCET-05-0680)support from Natural Science Foundation of Hubei Province (No.2006ABB037)
文摘The pearlite transformation in a Mo-containing iron alloy was investigated under 12 T magnetic field. The pearlite transformation was accelerated owing to the application of a strong magnetic field. Pearlite was of degenerated morphology without the presence of a strong magnetic field; but the degeneracy of pearlite is reduced when a strong magnetic field was applied, which may be attributed to the effect of strong magnetic field on faster carbon diffusion and less molybdenum segregation caused by a strong magnetic
基金This project was sponsored by the Joint Earthquake Science Foundation, China.
文摘By analyzing seismograms of short period records at the Beijing SeismoJogicaJ Observatory, the present paper investigates the amplitude ratio of seismic phases. The results indicate that the amplitude ratio of Sn/Lg is correlated with the lithosphere structure, the thermal state, and strong earthquake occurrence in the region the seismic rays pass through. The significance of such a correlation in the study on the genesis and prediction of strong earthquakes is discussed.
文摘The notion of equivalent dispersion of strong seismic waves is further illuminated and a frequency-dependentstochastic model of the Fourier phase of strong earthquake ground motion is presented for use in statistical estimates of the Fourier phase. The non-stationary features of design ground motions synthesized using the phasemodel in combination with the empirical attenuation model of amplitude spectra of strong ground motion are ableto be consistent with those of observed records in the sense of statistics.
基金Supported by the National Natural Science Foundation of China(10935007,11305180)the National Program on Key Basic Research Project of China(973 Program)(2009CB825200,2015CB856700)
文摘基于NCEP再分析资料、EC资料和常规观测资料,应用天气分析和诊断分析方法,对2016年1月广西的低温雨雪天气进行了分析,结果表明:(1)此次低温雨雪天气与阻塞高压的强而稳定密切相关。冷空气之强盛为历史所罕见,与历史同期相比,地面冷高压显著偏强,850 h Pa的0℃线明显偏南。850 h Pa华南强锋区的长时间维持,是造成此次过程的重要原因之一。(2)雨夹雪与雪的条件相似,主要是温度垂直结构存在差异;而降雪与降雨相比,温度垂直结构、云顶高度、逆温层顶部气温以及暖层的厚度、高度、强度、地面气温均有明显的区别。(3)降水相态由雨转为雪时,广西上空的锋面垂直结构有明显的变化。(4)持续而强盛的水汽输送、湿层深厚有利于阴雨、雪天气的发生及持续。相关分析结论可为广西低温雨雪冰冻预报提供技术参考。
