The effect of a transverse magnetic field on the oscillatory thermocapillary con- vection in the NaBi(WO4)2 melt was studied by using the in-situ observation system. The oscillation was attenuated when the 60 mT magne...The effect of a transverse magnetic field on the oscillatory thermocapillary con- vection in the NaBi(WO4)2 melt was studied by using the in-situ observation system. The oscillation was attenuated when the 60 mT magnetic field was applied, as shown by the decrease in the amplitude and the frequency. Furthermore, the os- cillation under smaller temperature difference was stabilized after the magnetic field was applied. The magnetic effect could be due to the Lorentz force generated by the interaction between motional ions and the vertical magnetic field. The ionic conductivities were measured to demonstrate the effect of the magnetic field. The solid ionic electrical conductivity increases with the temperature rise, and the melt ionic electrical conductivity was measured to be about 2.0×10-4 -1cm-1. Experi- mental results manifest that the effect of the magnetic field on anions and cations in the melt makes the flow change to the direction normal to the applied field, so the flow is more orderly and the oscillation is suppressed.展开更多
A recent fascinating development in the study of high-grade metamorphic basements is represented by the finding of tiny inclusions of crystallized melt(nanogranitoid inclusions) hosted in peritectic phases of migmatit...A recent fascinating development in the study of high-grade metamorphic basements is represented by the finding of tiny inclusions of crystallized melt(nanogranitoid inclusions) hosted in peritectic phases of migmatites and granulites. These inclusions have the potential to provide the primary composition of crustal melts at the source. A novel use of the recently-published nanogranitoid compositional database is presented here. Using granulites from the world-renowned Ivrea Zone(NW Italy) on which the original melt-reintegration approach has been previously applied, it is shown that reintegrating melt inclusion compositions from the published database into residual rock compositions can be a further useful method to reconstruct a plausible prograde history of melt-depleted rocks. This reconstruction is fundamental to investigate the tectonothermal history of geological terranes.展开更多
High P_T experiment with natural massive rock sample of garnet biotite plagioclase gneiss indicates that the metamorphic reaction involving melt (reaction between relic mineral phase and melt) is the most important re...High P_T experiment with natural massive rock sample of garnet biotite plagioclase gneiss indicates that the metamorphic reaction involving melt (reaction between relic mineral phase and melt) is the most important reaction in granulite_facies metamorphism and accompanies anatexis process.展开更多
用新疆105个气象站监测资料,分析了2015年夏季高温过程的极端特征.2015年夏季新疆区域出现高温过程,从7月上旬后期开始,南疆东南部以及东疆最早出现日最高气温≥35℃的高温天气,进入中旬后高温范围迅速向西、向北蔓延发展,下旬初期范围...用新疆105个气象站监测资料,分析了2015年夏季高温过程的极端特征.2015年夏季新疆区域出现高温过程,从7月上旬后期开始,南疆东南部以及东疆最早出现日最高气温≥35℃的高温天气,进入中旬后高温范围迅速向西、向北蔓延发展,下旬初期范围达最大,南北疆均出现高温天气.新疆区域该次高温过程在7月中下旬最为强盛,全疆84.8%的测站(89站)出现高温;52.4%的测站(55站)的高温持续日数位居历史第1位;全疆21.9%的测站(23站)极端最高气温位居历史第1位,极端最高气温出现在吐鲁番东坎,达到47.7℃.这次高温过程造成8站夏季温度位居同期第1位,南疆及天山山区的7月平均气温位居历史同期第1位,有54.3%的测站(57站)7月平均气温突破同期历史极值.海拔3 544 m的天山山区大西沟站7月份日最高气温连续突破历史极值,22日达到20.7℃.高温过程中,新疆区域7月0℃层高度位居1991年以来同期第1位,其中,7月19-23日连续6 d位居1991年以来的第1位.天山开都河流域日0℃层高度持续33 d高于1991-2015年平均值.7月上旬到下旬,在500 h Pa高空,伊朗高压东移并控制新疆,是造成此次高温过程的直接原因.在100 h Pa高空,南亚高压的形态、中心位置、强度变化与新疆此次高温过程演变关系密切.高温过程造成新疆高山区冰雪迅速消融,引发塔里木河流域出现融雪(冰)型洪水.展开更多
基金the National Natural Science Foundation of China (Grant No. 50331040)the Innovation Funds from Shanghai Institute of Ceramics,Chinese Academy of Sciences (Grant No. SCX0623)
文摘The effect of a transverse magnetic field on the oscillatory thermocapillary con- vection in the NaBi(WO4)2 melt was studied by using the in-situ observation system. The oscillation was attenuated when the 60 mT magnetic field was applied, as shown by the decrease in the amplitude and the frequency. Furthermore, the os- cillation under smaller temperature difference was stabilized after the magnetic field was applied. The magnetic effect could be due to the Lorentz force generated by the interaction between motional ions and the vertical magnetic field. The ionic conductivities were measured to demonstrate the effect of the magnetic field. The solid ionic electrical conductivity increases with the temperature rise, and the melt ionic electrical conductivity was measured to be about 2.0×10-4 -1cm-1. Experi- mental results manifest that the effect of the magnetic field on anions and cations in the melt makes the flow change to the direction normal to the applied field, so the flow is more orderly and the oscillation is suppressed.
基金supported by the Italian Ministry of Education, University, Research (Grant SIR RBSI14Y7PF to O.B.)
文摘A recent fascinating development in the study of high-grade metamorphic basements is represented by the finding of tiny inclusions of crystallized melt(nanogranitoid inclusions) hosted in peritectic phases of migmatites and granulites. These inclusions have the potential to provide the primary composition of crustal melts at the source. A novel use of the recently-published nanogranitoid compositional database is presented here. Using granulites from the world-renowned Ivrea Zone(NW Italy) on which the original melt-reintegration approach has been previously applied, it is shown that reintegrating melt inclusion compositions from the published database into residual rock compositions can be a further useful method to reconstruct a plausible prograde history of melt-depleted rocks. This reconstruction is fundamental to investigate the tectonothermal history of geological terranes.
文摘High P_T experiment with natural massive rock sample of garnet biotite plagioclase gneiss indicates that the metamorphic reaction involving melt (reaction between relic mineral phase and melt) is the most important reaction in granulite_facies metamorphism and accompanies anatexis process.
文摘用新疆105个气象站监测资料,分析了2015年夏季高温过程的极端特征.2015年夏季新疆区域出现高温过程,从7月上旬后期开始,南疆东南部以及东疆最早出现日最高气温≥35℃的高温天气,进入中旬后高温范围迅速向西、向北蔓延发展,下旬初期范围达最大,南北疆均出现高温天气.新疆区域该次高温过程在7月中下旬最为强盛,全疆84.8%的测站(89站)出现高温;52.4%的测站(55站)的高温持续日数位居历史第1位;全疆21.9%的测站(23站)极端最高气温位居历史第1位,极端最高气温出现在吐鲁番东坎,达到47.7℃.这次高温过程造成8站夏季温度位居同期第1位,南疆及天山山区的7月平均气温位居历史同期第1位,有54.3%的测站(57站)7月平均气温突破同期历史极值.海拔3 544 m的天山山区大西沟站7月份日最高气温连续突破历史极值,22日达到20.7℃.高温过程中,新疆区域7月0℃层高度位居1991年以来同期第1位,其中,7月19-23日连续6 d位居1991年以来的第1位.天山开都河流域日0℃层高度持续33 d高于1991-2015年平均值.7月上旬到下旬,在500 h Pa高空,伊朗高压东移并控制新疆,是造成此次高温过程的直接原因.在100 h Pa高空,南亚高压的形态、中心位置、强度变化与新疆此次高温过程演变关系密切.高温过程造成新疆高山区冰雪迅速消融,引发塔里木河流域出现融雪(冰)型洪水.
