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Microstructure and structural phase transitions in iron-based superconductors 被引量:1
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作者 王臻 蔡瑶 +5 位作者 杨槐馨 田焕芳 王秩伟 马超 陈震 李建奇 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第8期123-134,共12页
Crystal structures and microstructural features, such as structural phase transitions, defect structures, and chemical and structural inhomogeneities, are known to have profound effects on the physical properties of s... Crystal structures and microstructural features, such as structural phase transitions, defect structures, and chemical and structural inhomogeneities, are known to have profound effects on the physical properties of superconducting materials. Recently, many studies on the structural properties of Fe-based high-Tc superconductors have been published. This review article will mainly focus on the typical microstructural features in samples that have been well characterized by physical measurements. (i) Certain common structural features are discussed, in particular, the crystal structural features for different superconducting families, the local structural distortions in the Fe2Pn2 (Pn = P, As, Sb) or FeeCh2 (Ch = S, Se, Te) blocks, and the structural transformations in the 122 system. (ii) In FeTe(Se) (11 family), the superconductivity, chemical and structural inhomogeneities are investigated and discussed in correlation with superconductivity. (iii) In the Ko.sFe1.6+xSe2 system, we focus on the typical compounds with emphasis on the Fe-vacancy order and phase separations. The microstructural features in other superconducting materials are also briefly discussed. 展开更多
关键词 Fe-based superconductor structural transition structural inhomogeneity phase separation
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Present situation of the research and application of engineering multiwave seismic prospecting in China
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作者 吴小平 赵鸿儒 《Acta Seismologica Sinica(English Edition)》 CSCD 1996年第2期335-343,共9页
In four aspects, which are the leading exploration of mine and tunnel f engineering geological hazard prospecting and engineering shock resistance; non-destructive testing of engineering quality 1 the measurement of... In four aspects, which are the leading exploration of mine and tunnel f engineering geological hazard prospecting and engineering shock resistance; non-destructive testing of engineering quality 1 the measurement of rock physical properties, this pope gives a detailed summary and some comments on the present situation of the research and application of the ideas, theories and methods of engineering multiwave seismic prospecting. The content includes: the prospecting of coal field caved pillar, underground gallery, underground cavity and the fault ahead of tunnel; the exploration of earth surface Karst collapse, active fault, and shock resistance Of underground lifeline engineering; the dynamic non-destructive testing of quality and boring capacity of pile foundation, the non-destructive testing of strength, thickness and defects of concrete pavement, and the non-destructive testing of sub marine tunnel engineering quality ; the measurement of rock physical properties under high temperature and high pressure and the determination of physical properties of irregular rock samples. Some existing problems are discussed and the direction which should be developed in the future is proposed. 展开更多
关键词 engineering multiwave seismic prospecting inhomogeneous small-scale complex structure multiwave and multiphase.
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DYNAMICAL STUDY OF DIABATIC HEATING INFLUENCE ON RADIAL INHOMOGENEOUS STRUCTURE OF TROPICAL CYCLONE
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作者 雷小途 陈联寿 《Acta meteorologica Sinica》 SCIE 2002年第1期86-93,共8页
Based on the tropical cyclone(TC)asymmetric disturbance as the superposition of the symmetric environmental circulation,the analytical solution of travelling wave is given by using the barotropical nondivergent model ... Based on the tropical cyclone(TC)asymmetric disturbance as the superposition of the symmetric environmental circulation,the analytical solution of travelling wave is given by using the barotropical nondivergent model with diabatic heating forcing and non-friction in a plane polar coordinate.Then,the TC radial inhomogeneous structure is analyzed on radial/tangential velocity and geopotential height.It is found that the different kinds of structures are influenced by the Coriolis parameter(f),TC intensity(Ω),disturbance circular frequency(ω),and TC angular wavenumber(m).And,the diabatic heating(Q_1)has significant impacts on the radial/tangential velocity distribution shaped like the inner-tight and outer-relaxed. 展开更多
关键词 tropical cyclone(TC) diabatic heating radial inhomogeneous structure
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