期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Morphological evolution and flow conduction characteristics of fracture channels in fractured sandstone under cyclic loading and unloading 被引量:1
1
作者 Quanle Zou Zihan Chen +4 位作者 Jinfei Zhan Chunmei Chen shikang gao Fanjie Kong Xiaofeng Xia 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2023年第12期1527-1540,共14页
In coal mining,rock strata are fractured under cyclic loading and unloading to form fracture channels.Fracture channels are the main flow narrows for gas.Therefore,expounding the flow conductivity of fracture channels... In coal mining,rock strata are fractured under cyclic loading and unloading to form fracture channels.Fracture channels are the main flow narrows for gas.Therefore,expounding the flow conductivity of fracture channels in rocks on fluids is significant for gas flow in rock strata.In this regard,graded incremental cyclic loading and unloading experiments were conducted on sandstones with different initial stress levels.Then,the three-dimensional models for fracture channels in sandstones were established.Finally,the fracture channel percentages were used to reflect the flow conductivity of fracture channels.The study revealed how the particle size distribution of fractured sandstone affects the formation and expansion of fracture channels.It was found that a smaller proportion of large blocks and a higher proportion of small blocks after sandstone fails contribute more to the formation of fracture channels.The proportion of fracture channels in fractured rock can indicate the flow conductivity of those channels.When the proportion of fracture channels varies gently,fluids flow evenly through those channels.However,if the proportion of fracture channels varies significantly,it can greatly affect the flow rate of fluids.The research results contribute to revealing the morphological evolution and flow conductivity of fracture channels in sandstone and then provide a theoretical basis for clarifying the gas flow pattern in the rock strata of coal mines. 展开更多
关键词 CT imaging Flow conductivity Three-dimensional reconstruction Proportion of fracture channels Cyclic loading and unloading
下载PDF
通过键共价性增加策略获得高性能Cu_(3)SbSe_(4)基热电材料
2
作者 张旦 钟瑞奇 +8 位作者 高仕康 杨磊 徐芳 何平 柳冠楠 伞星源 杨君友 罗裕波 王淑芳 《Science China Materials》 SCIE EI CAS CSCD 2023年第9期3644-3650,共7页
通过Cu_(3)SbSe_(4)-MTe (M=Ge/Sn)固溶体系的对比研究,本文报道了一种增加键共价性来弱化电声耦合进而获得高迁移率的策略,也证实了该策略能提升Cu_(3)SbSe_(4)化合物的热电性能.研究发现,相比于SnTe固溶,GeTe固溶赋予Cu_(3)SbSe_(4)... 通过Cu_(3)SbSe_(4)-MTe (M=Ge/Sn)固溶体系的对比研究,本文报道了一种增加键共价性来弱化电声耦合进而获得高迁移率的策略,也证实了该策略能提升Cu_(3)SbSe_(4)化合物的热电性能.研究发现,相比于SnTe固溶,GeTe固溶赋予Cu_(3)SbSe_(4)化合物在相似载流子浓度情况下更高的迁移率,进而获得更优越的电输运性能.密度泛函理论计算表明,与SnTe固溶相比,GeTe固溶能增加Cu_(3)SbSe_(4)化学键共价性因而具有优越的电输运性能.最终,在Cu_(3)SbSe_(4)-1%GeTe样品中取得了0.8的最大热电优值(@648 K)和0.41的平均热电优值(300–648 K).此研究表明,通过增加键共价性来弱化电声耦合进而获得高迁移率是提升热电性能的有效途径. 展开更多
关键词 密度泛函理论计算 共价性 热电性能 热电优值 高迁移率 热电材料 载流子浓度
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部