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Crustal electrical structure across the Tangra-Yumco tectonic belt revealed by magnetotelluric data: new insights on the east-west extension mechanism of the Tibetan plateau

Chen Ning, Wang Xuben, Shao Changsheng, Zou Jun, Xu Zhengwei, Li Dewei, Wang Xiangpeng

Acta Geophysica

2023

Vol. 71, no. 2

783--794

Geologic evolution of the Tibetan plateau is characterized by crustal extension and horizontal movement in the post-collision stage, during which, approximate north–south (N–S) trending tectonic belts typically represented by Tangra-Yumco rift are developed. The Tangra-Yumco tectonic belt is an ideal object to investigate the deep structure and mechanism of the crustal extension. The magnetotelluric (MT) method is effective in probing crustal structures, especially for high-conductivity bodies. A MT profile of east–west direction with dense stations has been carried out across the Tangra-Yumco tectonic belt. Resistivity models independently derived from two-dimensional and three-dimensional inversions provided more detailed geophysical constraints on the mechanism of crustal extension and deformation. A significant conductor with estimated melt fraction as 3.0–7.5% in mid-lower crust was revealed under the N–S tectonic belt, where the asthenospheric upwelling through the slab-tearing window might have induced partial melting of the lithospheric mantle and lower crust. Combined with previous studies, the upward migration of hot mantle materials and the expansion of the lower crust should be the primary mechanism driving east–west (E–W) extension of the brittle upper crust with high resistivity above the depth of 30 km. According to lateral electrical discontinuity in the upper crust, we inferred that there might exist three normal faults with the reference of topography and the trend of extension of the existing faults. The expansion and deformation of the conductor might have pulled the brittle upper crust and cause significant E–W extension, leading to the formation of the approximate N–S trending rift and normal faults.

Electronic structure and possible martensitic transformation in Ni2FeIn alloy

Gu Y., Xue F, Zhao G, Liu G., Liu Y., Li S.

Materials Science Poland

2014

Vol. 32, No. 3

396—401

The electronic structure and magnetic properties of Heusler alloys (Ni2FeIn) have been studied by first principle calculations. The possible tetragonal martensitic transformation has been predicted and the structure optimization was made on cubic austenitic Ni2FeIn in Cu2MnAl type. The equilibrium lattice constant of austenitic Ni2FeIn is 6.03 A° . In tetragonal phase, the global energy minimum occurs at c=a = 1.29. The corresponding equilibrium lattice constants for martensite Ni2FeIn are a = b = 5.5393 °A and c = 7.1457 A° , respectively. In the austenitic phase, EF is located at the peak in the minority DOS for c=a = 0.96 to 1.20, but in the martensitic phase, EF moves to the bottom of the valley in the minority DOS, reducing the value of N(EF ) effectively. Both austenitic and martensitic phases are ferromagnetic and the Ni and Fe partial moments contribute mainly to the total moments. Therefore, the martensitic transformation behavior in Ni2FeIn is predicted.

Badanie wrażliwości struktur Esla

Jagodzińska K., Walkowiak M., Wysota M.

Zeszyty Naukowe Akademii Marynarki Wojennej

2009

R. 50 nr 177B

127-134

W pracy przedstawiono metodę "M2" generowania efektywnych struktur elektrycznie małych anten liniowych(ESLA). Za pomocą tej metody możliwe jest badanie wrażliwości struktur antenowych na niewielkie zmiany geometryczne. Badana struktura antenowa składa się z określonej ilości odcinków(segmentów) prostego przewodu. Odcinki przewodu łączone są w sposób szeregowy. Ponadto segmenty są stałe) długości. Antena umieszczona jest nad powierzchnią doskonale przewodzącą i otoczona jest półsferą ograniczającą o zadanym promieniu R. Wszystkie parametry anten ESLA wyznaczone są w środowisku NEC.

This paper introduces a new method called "M2". With this method the susceptibility for small geometrical changes of electrically small linear antenna (ESLA) can be investigated. Our antenna structure is comprised of a number of connected linear wire segments. Segments length are equal. The antenna is confined in a hemispheric space with a given radius over the perfectly conducting ground plane. To predict the performance of antennas we use The Numerical Electromagnetic Code.