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Anisotropic phonon softening of uniaxially strained bilayer graphene
Cho, Yujin,Jegal, Seonyoung,Lee, Jae-Ung,Yoon, Duhee,Choi, Seon-Myoung,Son, Young-Woo,Cheong, Hyeonsik Elsevier 2016 Carbon Vol.103 No.-
<P>The effect of strain on the phonon dispersion of bilayer graphene has been studied by polarized Raman spectroscopy on uniaxially strained bilayer graphene. Each of the four peaks that constitute the Raman 2D band splits and redshifts under strain, with the shift rate depending on the strain direction relative to the crystallographic orientation. By comparing the experimental data with first-principles calculation results, it is shown that the splitting and the redshift of the peaks originate from the anisotropic modifications of the phonon dispersion and the electronic band structure of bilayer graphene. The intensity of each peak also depends on the magnitude and direction of strain, which can be explained in terms of the correlation with the momentum of the phonon involved in the Raman scattering path. (C) 2016 Elsevier Ltd. All rights reserved.</P>
A Brief Review on Limestone Sources and Oyster Waste Generation-Bantayan
Yu, Kwang Sun,Thriveni, Thenepalli,Jegal, Yujin,Whan, Ahn Ji The Korean Society for Energy 2017 에너지공학 Vol.26 No.1
Limestone is an important commodity in Philippines. Limestone has numerous uses that range from agricultural applications to building materials to medicines. Many limestone products require rock with specific physical and chemical characteristics. Most limestone is biochemical in origin meaning the calcium carbonate in the stone originated from shelled oceanic creatures. In this paper, we reported the natural sources of limestone, geological formation of limestone and the oyster shell waste in Cebu, Bantayan, Philippines were reported. Due to the mining or quarrying in Cebu, Bantayan, in a limestone area poses the threat of groundwater pollution (since limestone is a porous geologic formation with a high transmissivity). The other environmental issue is oyster shell waste. The oyster shell waste is the major source of limestone. We developed and applied appropriate technologies for the extraction of limestone from oyster shell waste and utilizes as high value added material.