The kinetics of the reduction and demetalization of hydroxooxo [ 5, 10, 15, 20-tetrakis ( p-sulfonatophenyl ) porphyrinato] molybdenum (V) ,OMo(V) (OH)TPPS ,by ascorbic acid(i. e. Vitamine C,abbr. H2Asc) ,have been st...The kinetics of the reduction and demetalization of hydroxooxo [ 5, 10, 15, 20-tetrakis ( p-sulfonatophenyl ) porphyrinato] molybdenum (V) ,OMo(V) (OH)TPPS ,by ascorbic acid(i. e. Vitamine C,abbr. H2Asc) ,have been studied in aqueous so-lutions,I=0. 10(KC1) at 30 or 35℃. The reactions ivere run under pseudo-first-order conditions with ascorbic acid in at least 30 fold excess over Mo-porpkyrin. Pseudo-first-order rate constants, kabsd, obtained by monitoring the appearance of TPPS peak at 413. 3mm. The experimental data give a good fit to d[TPPS]/dt= (kl-+k2 [OH-]K3Ka2,[H2Asc]/(Ka2 + [H+]))[Mo(V)P](l)where P rep-resents the porphyrin,the rate constants K1,K2,K3 and Ka2 are KI = 2.185XI0-3,K2 =3. 624X10-2,K3 = 3. 210,Ka2 = 1. 29X10-12 at 35℃展开更多
This study analyzed data from the DEMETER satellite,collected 10 days before the Wenchuan M_(s)8.0 earthquake on May 12,2008.The time-frequency power spectrum of the data indicated a narrow-band radiative destabilizat...This study analyzed data from the DEMETER satellite,collected 10 days before the Wenchuan M_(s)8.0 earthquake on May 12,2008.The time-frequency power spectrum of the data indicated a narrow-band radiative destabilization(below the cut-off frequency)6 days prior to the earthquake.A significant anomaly in the Ez component was observed 3 days before the event.However,similar phenomena were found over aseismic regions,suggesting a link between ionospheric changes and the earthquake generation process.展开更多
A destructive shock with magnitude of 6.3 occurred on 2 June 2007 at 21h34min56s UT in Pu’er region (23.0°N, 101.1°E), Yunnan Province, China. The data from DEMETER satellite during the period from 23 May t...A destructive shock with magnitude of 6.3 occurred on 2 June 2007 at 21h34min56s UT in Pu’er region (23.0°N, 101.1°E), Yunnan Province, China. The data from DEMETER satellite during the period from 23 May to 2 June, i.e., ten days before the earthquake and one day just on the day of earthquake occurrence, were analyzed. Among the 284 orbits of DEMETER during the period, 29 orbits with the trace passing through the region within 1 888 km from the epicenter were selected to be studied. Seven anomalous events were found on the dataset of the seven orbits among the 29 ones. There existed synchronous perturbations on the variations of the spectrogram of the electric field and the variations of the density and temperature of the ions and electron, in contrast with the variations of its surround- ing area. And five events appeared in the space within 1 888 km from the epicenter while the other two were out of the studied area. Electrostatic turbulences were also recorded with the synchronous perturbations with that in the electron density and ions density in plasma in the region near the epicenter in the five events, which seems to sug- gest that there be some physical relation between these events and the preparation processes of Pu’er earthquake.展开更多
In this paper,Changli station in Hebei Province was taken as an example,in which the minute data of geomagnetic Z component was used to analyze the spectral values of its main frequencies during normal time,geomagneti...In this paper,Changli station in Hebei Province was taken as an example,in which the minute data of geomagnetic Z component was used to analyze the spectral values of its main frequencies during normal time,geomagnetic storm time and low point displacement time interval respectively. After fitting of ten high spectral values to loga-rithmic functions,it is found that,by using same length of data,the spectral values at geomagnetic storm time in-crease apparently compared with those at normal time,especially at the high frequency segment. While low point displacement occurred,the spectral values at high frequency are approximate to those at normal time,but at period above 4 hours they are mostly lower than those at normal time. Comparison of accumulating of some FFT results at low point displacement and normal time shows that,spectral values at periods of 8.5 and 13.7 hours increase at low point displacement time relative to those at normal time. Compared with the images of Ne observed at DE-METER satellite,it is illustrated that the occurrence of geomagnetic low point displacement is well corresponding with the increase of Ne in ionosphere. Finally it was discussed about those spectral features and the occurrence mechanism of geomagnetic low point displacement.展开更多
法国DEMETER(Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions)卫星是世界上第一颗专门针对地震电离层扰动监测的电磁卫星,于2004年发射,2010年底结束运行,共在轨飞行6.5年,获得3万多条整轨数据,为地震...法国DEMETER(Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions)卫星是世界上第一颗专门针对地震电离层扰动监测的电磁卫星,于2004年发射,2010年底结束运行,共在轨飞行6.5年,获得3万多条整轨数据,为地震监测及电离层物理研究提供了坚实的数据基础。全球科学家利用这颗卫星的数据开展了大量的地震应用研究,发表文章上百篇,将电磁卫星的地震应用研究推向了新的阶段。中国第一颗电磁监测试验卫星CSES(China Seismo-Electromagnetic Satellite)于2018年2月2日成功发射,目前已完成在轨测试并交付使用,科学数据也已正式对外发布。如何充分发挥CSES卫星的应用效能,将空间电磁监测向业务化运行转化,总结和思考DEMETER卫星的技术进步、研究成果及曾经出现过的问题,十分重要。因此,本文着重介绍DEMETER卫星在地震监测应用领域的代表性研究进展,并结合CSES卫星的设计和运转实践,对未来空间地震电磁探测及科学研究的发展方向进行一些初步讨论。展开更多
文摘The kinetics of the reduction and demetalization of hydroxooxo [ 5, 10, 15, 20-tetrakis ( p-sulfonatophenyl ) porphyrinato] molybdenum (V) ,OMo(V) (OH)TPPS ,by ascorbic acid(i. e. Vitamine C,abbr. H2Asc) ,have been studied in aqueous so-lutions,I=0. 10(KC1) at 30 or 35℃. The reactions ivere run under pseudo-first-order conditions with ascorbic acid in at least 30 fold excess over Mo-porpkyrin. Pseudo-first-order rate constants, kabsd, obtained by monitoring the appearance of TPPS peak at 413. 3mm. The experimental data give a good fit to d[TPPS]/dt= (kl-+k2 [OH-]K3Ka2,[H2Asc]/(Ka2 + [H+]))[Mo(V)P](l)where P rep-resents the porphyrin,the rate constants K1,K2,K3 and Ka2 are KI = 2.185XI0-3,K2 =3. 624X10-2,K3 = 3. 210,Ka2 = 1. 29X10-12 at 35℃
基金National Natural Science Foundation of China(No.41274079,No.42304080)Seismic Safety and Health Monitoring of Major Construction Projects-Bridge and Reservoir Seismic Monitoring(No.DZ2024083000001)State Key Research and Development Plan under Grant(No.2018YFE0208300,No.2018YFC0603500).
文摘This study analyzed data from the DEMETER satellite,collected 10 days before the Wenchuan M_(s)8.0 earthquake on May 12,2008.The time-frequency power spectrum of the data indicated a narrow-band radiative destabilization(below the cut-off frequency)6 days prior to the earthquake.A significant anomaly in the Ez component was observed 3 days before the event.However,similar phenomena were found over aseismic regions,suggesting a link between ionospheric changes and the earthquake generation process.
基金Special Project for Earthquake Monitoring of China Earthquake Administration.
文摘A destructive shock with magnitude of 6.3 occurred on 2 June 2007 at 21h34min56s UT in Pu’er region (23.0°N, 101.1°E), Yunnan Province, China. The data from DEMETER satellite during the period from 23 May to 2 June, i.e., ten days before the earthquake and one day just on the day of earthquake occurrence, were analyzed. Among the 284 orbits of DEMETER during the period, 29 orbits with the trace passing through the region within 1 888 km from the epicenter were selected to be studied. Seven anomalous events were found on the dataset of the seven orbits among the 29 ones. There existed synchronous perturbations on the variations of the spectrogram of the electric field and the variations of the density and temperature of the ions and electron, in contrast with the variations of its surround- ing area. And five events appeared in the space within 1 888 km from the epicenter while the other two were out of the studied area. Electrostatic turbulences were also recorded with the synchronous perturbations with that in the electron density and ions density in plasma in the region near the epicenter in the five events, which seems to sug- gest that there be some physical relation between these events and the preparation processes of Pu’er earthquake.
基金National Science and Technology Program (2006BAC011302-04-02)Basic Research Project in Institute of Earthquake Science,China Earthquake Administration.
文摘In this paper,Changli station in Hebei Province was taken as an example,in which the minute data of geomagnetic Z component was used to analyze the spectral values of its main frequencies during normal time,geomagnetic storm time and low point displacement time interval respectively. After fitting of ten high spectral values to loga-rithmic functions,it is found that,by using same length of data,the spectral values at geomagnetic storm time in-crease apparently compared with those at normal time,especially at the high frequency segment. While low point displacement occurred,the spectral values at high frequency are approximate to those at normal time,but at period above 4 hours they are mostly lower than those at normal time. Comparison of accumulating of some FFT results at low point displacement and normal time shows that,spectral values at periods of 8.5 and 13.7 hours increase at low point displacement time relative to those at normal time. Compared with the images of Ne observed at DE-METER satellite,it is illustrated that the occurrence of geomagnetic low point displacement is well corresponding with the increase of Ne in ionosphere. Finally it was discussed about those spectral features and the occurrence mechanism of geomagnetic low point displacement.
文摘法国DEMETER(Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions)卫星是世界上第一颗专门针对地震电离层扰动监测的电磁卫星,于2004年发射,2010年底结束运行,共在轨飞行6.5年,获得3万多条整轨数据,为地震监测及电离层物理研究提供了坚实的数据基础。全球科学家利用这颗卫星的数据开展了大量的地震应用研究,发表文章上百篇,将电磁卫星的地震应用研究推向了新的阶段。中国第一颗电磁监测试验卫星CSES(China Seismo-Electromagnetic Satellite)于2018年2月2日成功发射,目前已完成在轨测试并交付使用,科学数据也已正式对外发布。如何充分发挥CSES卫星的应用效能,将空间电磁监测向业务化运行转化,总结和思考DEMETER卫星的技术进步、研究成果及曾经出现过的问题,十分重要。因此,本文着重介绍DEMETER卫星在地震监测应用领域的代表性研究进展,并结合CSES卫星的设计和运转实践,对未来空间地震电磁探测及科学研究的发展方向进行一些初步讨论。
