检索结果-南通市图书馆

Measurement of the Dielectric Properties of Volcanic scoria and Basalt at 9370 MHz

Acta Geologica Sinica(English Edition) 2005年第2期79卷 291-295页

作者： ZHENGYongchun WANGShijie OUYANGZiyuan LIXiongyao InstituteofGeochemistry ChineseAcademyofSciencesGuiyangGuizhou550002／／GraduateSchoolChineseAcademyofSciencesBeijing100039 InstituteofGeochemistry ChineseAcademyofSciencesGuiyangGuizhou550002

Dielectric data for volcanic scoria and basalt on the earth at microwave frequency are extremely sparse, and also crucial for volcanic terrains imaging, and development. In consideration of their similarity to lunar regolith (soils and rocks) in chemical and mineral composition, the dielectric data is significative for passive and active microwave remote sensing on the Moon. This study provides the data about the dielectric properties of three kinds of scoria and two kinds of basalt in China. The method put forward in this paper is also applicable for measuring the dielectric properties of dry rocks and other granular ground materials with low complex dielectric constants. Firstly, the authors measured the e' and tanδ values of strip specimens prepared from the mixture of scoria or basalt powder and polythene with the resonant cavity perturbation method at 9370 MHz. Secondly, from the ε' and tanδ values of the mixture, the ε' s and tanδ s values of solid scoria and basalt were calculated using Lichtenecker's mixture formulae. Finally, the effective complex dielectric constants, ε' e and tanδ e , of scoria at different bulk densities were calculated. The results have shown that the ε' s and tanδ s values of all solid basaltic materials measured (both solid basaltic scoria or basalt) are approximately 7 and 0.05, respectively. With increasing bulk density of scoria, the ε' c and tanδ e values of scoria increase significantly.

关键词： 9370 MHz resonant cavity perturbation method scoria basalt complex permittivity Lichtenecker's mixture formulae

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Catalyst-Packed Non-Thermal Plasma Reactor for Removal of Nitrogen Oxides

引用

Plasma Science and Technology 2003年第1期5卷 1603-1608页

作者： V.Ravi YoungSunMok B.S.Rajanikanth Ho-ChulKang DepartmentofHighVoltageEngineering IndianInstituteofScienceBangalore-560012India DepartmentofChemicalEngineering ChejuNationalUniversityAraCheju690-756SouthKorea

A single-stage plasma-catalytic reactor in which catalytic materials werepacked was used to remove nitrogen oxides. The packing material was scoria being made of variousmetal oxides including Al_2O_3, MgO, TiO_2, etc. scoria was able to act not only as dielectricpellets but also as a catalyst in the presence of reducing agent such as ethylene and *** plasma discharge, scoria did not work well as a catalyst in the temperature range of 100 ℃to 200 ℃, showing less than 10% of NOx removal efficiency. When plasma is produced inside thereactor, the NOx removal efficiency could be increased to 60% in this temperature range.

关键词： plasma catalyst scoria nitrogen oxides removal

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Study on Pyroclastic Deposits in the Longgang Volcanic Swarm, Northeastern China

引用

Global Geology 2000年第1期5卷 41-47页

作者： Liu Xiang Sui Weiguo Xiang Tianyuan Huang Yiqun Jilin University Changchun 130026 R. P. China

The Dayizishan scoria cone and Jinlongdingzi scoria cone in the Longgang volcanic swarm, northeastern China are comprised of basaltic fallout tephra that derived from sub-Plinian eruptions. The airborn tephra formed a scoria cone and tephra sheets in geomorphological character. The fallout tephra deposits consist of basaltic scoria, bomb, ultramafic xenolith and lithic fragments. The tephra deposits in the tephra sheets developed plane parallel bedding and graded bedding. The size parameters of tephra changed with distance away from source and the lapse of time regularly. The Dalongwan tuff ring and Longquanlongwan tuff ring in Longgang volcanic swarm are comprised of base surge deposits, formed by phreatomagmatic explosions. The base surge deposits are composed of basaltic lapilli, pisolites and tuff. The sedimentary structure, for instance, dunelike structure, chute and pool structure, U-shaped channel and cross bedding, massive beds and sandwave beds etc. are recognized.

关键词： scoria cone Tuff ring Longgang volcanic swarm$

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

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：