检索结果-南通市图书馆

Resistivity Measurement of Molten Olivine in a Laser-Heated Diamond Anvil Cell

Chinese Physics Letters 2007年第4期24卷 1010-1012页

作者：李明高春晓马艳章贺春元郝爱民张东梅李延春刘景王多君 National Laboratory of Superhard Materials Institute of Atomic and Molecular Physics Jilin University Changchun 130012 Department of Mechanical Engineering Texas Tech University Lubbock TX 79409 USA Beijing Synchrotron Radiation Laboratories Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002

The electrical conductivity of molten olivine is studied up to 3720K and 13.2 GPa. The results indicate that the electrical conductivity of molten olivine exhibits the perfect Arrhenius behaviour. The activation energy as well as temperature effect is much smaller than that of the solid olivine. It is expected that the high conductivity zone in the mantle is almost independent of the melting based on our experimental data.

关键词： X-RAY-DIFFRACTION electrical-conductivity HIGH-PRESSURE MEGABAR PRESSURES UPPER-MANTLE SUPERconductivity TEMPERATURE GPA

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Phase Transition Kinetics in Bi3NbO7 Evaluated by in situ Isothermal conductivity Measurements

引用

Chinese Physics Letters 2007年第4期24卷 1013-1016页

作者：王先平程帜军方前锋 Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031

Kinetics of phase transformation from pseudocubic to tetragonal phase in Bi3NbO7 solid solution is studied by using the ac impedance method under isothermal conditions. conductivity of the investigated compound is used to characterize the kinetic process of the transition. The Avrami exponent and the activation energy of phase transition are around 1.5 and 3.5eV, respectively. These kinetic parameters reveal that the pseudocubic-tetragonal transition in Bi3NbO7 .belongs to a three-dimensional diffusion-controlled growth with zero nucleation rate.

关键词： BI2O3-NB2O5 SOLID-SOLUTION OXIDE-ION CONDUCTORS X-RAY-DIFFRACTION CRYSTALLIZATION KINETICS electrical-conductivity SYSTEM TRANSFORMATION ELECTROLYTES BI2O3-TA2O5 BI2O3-MOO3

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Lengthening the Lifetime of Long Plasma Channel in Air Generated by Femtosecond Laser Pulse

引用

Chinese Physics Letters 2006年第6期23卷 1482-1485页

作者：陈笑蒋红兵龚旗煌 State Key Laboratory for Mesoscopic Physics and Department of Physics Peking University Beijing 100871

We theoretically investigate the lifetime of self-guided plasma channel in air by launching an auxiliary delayed long-pulsed laser beam following an ultrashort laser. A detailed model makes the electron-ion recombination, the attachment of electrons on neutral particles, and particularly the impact ionization and electron-detachment mechanism incorporate. The calculated results show that the temporal evolution of electron density is greatly flattened and broadened. When the auxiliary laser intensity exceeds the threshold 3.32 × 10^4 Wcm^-2, the channel lifetime is distinctly prolonged from nanosecond to microsecond, or even longer due to the electrical field enhancement. Furthermore, with the laser intensity up to 109 Wcm^-2, the impact ionization overwhelms the detachment in effect. Thus, it is an effective way to extend the channel lifetime and provides a real opportunity for applications.

关键词： electrical-conductivity CONICAL EMISSION

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：