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Experimental Study on the Electro-osmotic Treatment of Frost Boiling Damage of Cold-Region Subgrade
Deren Liu,Jiale Yang,Shuangyang Li,Xu Wang,Shuochang Xu 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.4
In cold regions, the pore water of subgrade surface soil rises sharply because ice lenses thaw in spring-thawing seasons and cannot drain out in a short time, which leads to a high water content in the thawed layer of the cold-region subgrade. Frost boiling damage of subgrade occurs frequently under repeated traffic loads and seriously affects the normal operation of the road. Based on the advantages of rapid and effective electro-osmotic drainage, a horizontal stage electro-osmotic drainage method (HSEDM) was designed to treat the frost boiling damage of cold-region subgrade. To test the engineering effectiveness of the HSEDM, a model test was carried out, in which many key indexes, such as the current intensity, effective potential, electrode corrosion, water content, shear strength and surface settlement, were closely monitored. Through the controlled trial, it indicates that the pore water was mainly driven to move from the anode to the cathode and further drained out from the slope by electric field force. At the same time, the shear strength of the frost boiling subgrade increases significantly after electro-osmotic consolidation. The experimental results provide a theoretical basis for the engineering application of the HSEDM in the treatment of frost boiling damage of cold-region subgrade.
Ning Zhou,Meng Yuan,Dongsheng Li,Deren Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.3
A time- and energy- saving solution-based chemical precipitation method was developed to synthesize leaf-like CuO nanostructures. The morphology and size of the leaf-like CuO nanostructures could be simply manipulated by controlling the type and concentration of precursors, and the oriented attachment mechanism is responsible for the formation of leaf-like shape. With the concurrent reduction reaction and at appropriate concentration, CuO/Ag microspheres could be prepared and the growth mechanism is proposed. These two structures could serve as effective photocatalyst for the degradation of rhodamine B under visible light irradiation in the presence of hydrogen peroxide. Moreover, compared to pure CuO nanostructures, the photodecomposition activity of CuO/Ag microspheres increases by 42.9% due to plasmon-enhanced light absorption.
Fabrication and Magnetic Properties of A New Fe-based Amorphous Compound Powder Cores
Wang Xiangyue,Guo Feng,Lu Caowei,Lu Zhichao,Li Deren,Zhou Shaoxiong 한국자기학회 2011 Journal of Magnetics Vol.16 No.3
A new Fe-based amorphous compound powder was prepared from Fe-Si-B amorphous powder by crushing amorphous ribbons as the first magnetic component and Fe-Cr-Mo metallic glassy powder by water atomization as the second magnetic component. Subsequently by adding organic and inorganic binders to the compound powder and cold pressing, the new Fe-based amorphous compound powder cores were fabricated. This new Fe-based amorphous compound powder cores combine the superior DC-Bias properties and the excellent core loss. The core loss of 500 ㎾/㎥ at Bm = 0.1T and f = 100 ㎑ was obtained When the mass ratio of FeSiB/FeCrMo equals 3:2, and meanwhile the DC-bias properties of the new Fe-based amorphous compound powder cores just decreased by 10% compared with that of the FeSiB powder cores. In addition, with the increasing of the content of the FeCrMo metallic glassy powder, the core loss tends to decrease.