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Xiaoshan Wang,Yujing Jiang,Bo Li 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.2
Understanding the process of crack propagation and deformation around underground openings is a key issue in several engineering fields, such as tunneling, mining, and radioactive waste disposal facilities. Many failures of underground openings are commonly induced by the geological discontinuities of host rock masses, which contain the existing discontinuities and the new cracks generated during the construction of underground structures. In this study, base friction tests were conducted to investigate the influence of dip angle of layered joints on the stability of circular openings in jointed rock masses and a series of numerical simulations utilizing an originally developed code based on distinct element method (DEM) were performed on the experimentbased and extended numerical models, respectively. The results show that the main propagation direction of newly generated cracks is approximately perpendicular to the joint dip angle. For the brittle host rock masses, the deformation around the underground openings is governed by the tensile failure of host rock masses. A decrease in joint dip angle gives rise to an increase of plastic failure zone in the host rock masses. The models with lower joint dip angles could generate a larger number of cracks. The maximum displacement observed at the left shoulder of openings is approximately 1.8–2 times of the minimum displacement at the right side wall of circular opening. The influences of the opening shape on the main propagation direction of newly generated cracks could be negligible. Due to the stress concentration at the sharp corner of square openings, a larger area of plastic zones is developed, which leads to obvious increment of displacements around the underground openings.
Cao, Linfen,Wang, Xiaoshan Korean Mathematical Society 2021 대한수학회지 Vol.58 No.6
In this paper, we consider the following nonlocal fractional Laplacian equation with a singular nonlinearity (-∆)<sup>s</sup>u(x) = λu<sup>β</sup> (x) + a<sub>0</sub>u<sup>-γ</sup> (x), x ∈ ℝ<sup>n</sup>, where 0 < s < 1, γ > 0, $1<{\beta}{\leq}\frac{n+2s}{n-2s}$, λ > 0 are constants and a<sub>0</sub> ≥ 0. We use a direct method of moving planes which introduced by Chen-Li-Li to prove that positive solutions u(x) must be radially symmetric and monotone increasing about some point in ℝ<sup>n</sup>.
ZnO/TiO2 core–shell heterojunction for CdS and PbS quantum dot-cosensitized solar cells
Fangfang Gao,Qian Chen,Xiaoshan Zhang,Huan Wang,Tianjiao Huang,Liya Zhou 한국물리학회 2018 Current Applied Physics Vol.18 No.5
ZnO nanorods (NRs) with regular morphology were prepared through hydrothermal method, and the TiO2 shell was assembled onto the surface of ZnO NRs by spin coating to the ZnO/TiO2 core–shell heterojunction. CdS and PbS quantum dots (QDs) were used to cosensitize the ZnO/TiO2 nanostructure by direct adsorption (DA) and successive ionic layer adsorption and reaction, respectively. SEM, TEM, and HRTEM images show that the samples possessed a rough surface and four lattice fringes indicating the successful synthesis of the ZnO/TiO2/ CdS/PbS composite structure. The ZnO/TiO2(10T)/CdS/PbS sample showed a high absorption intensity at a broad range of wavelength to visible light region. The ZnO/TiO2(10T)/CdS/PbS photoelectrode with QDSSCs showed the highest IPCE of 36.04% and photoelectric efficiency (η) of 1.59%; these values increased by approximately 550% and 150% compared with those of unsensitized ZnO (0.29%) and ZnO/TiO2(10T) (1.04%) and about 146% and 120% compared with those of ZnO/TiO2(10T)/CdS and ZnO/TiO2(10T)/PbS, respectively. The fill factor was 0.36, and the photocurrent density (Jsc) and open circuit voltage (Voc) reached the maximum values of 9.73 mA cm−2 and 0.46 V, respectively.
New Path-Setup Method for Optical Network-on-Chip
Huaxi Gu,Zhengyu Wang,Yintang Yang,Xiaoshan Yu 한국전자통신연구원 2014 ETRI Journal Vol.36 No.3
With high bandwidth, low interference, and low powerconsumption, optical network-on-chip (ONoC) hasemerged as a highly efficient interconnection for the futuregeneration of multicore system on chips. In this paper, wepropose a new path-setup method for ONoC to mitigatecontentions, such as packets, by recycling the setup packethalfway to the destination. A new, strictly non-blocking6 × 6 optical router is designed to support the new method. The simulation results show the new path-setup methodincreases the throughput by 52.03%, 41.94%, and 36.47%under uniform, hotspot-I, and hotspot-II traffic patterns,respectively. The end-to-end delay performance is alsoimproved.
Ammonia etched petroleum pitch-based porous carbon as efficient catalysts for CO2 electroreduction
Ning Hui,Guo Zhihao,Wang Wenhang,Wang Xiaoshan,Yang Zhongxue,Ma Zhengguang,Tian Yangming,Wu Chenghao,Hao Jian,Wu Mingbo 한국탄소학회 2022 Carbon Letters Vol.32 No.3
Electrochemical reduction of carbon dioxide to valuable chemicals is a promising way of storing renewable energy through electric-to-chemical energy conversion, while its large-scale application is in urgent need of cheap and high-performance catalysts. Herein, we invent a convenient method to synthesize N-doped porous carbon by ammonia etching the pyrolysis carbon of petroleum pitch. We found the ammonia etching treatment not only increase the pyridinic-N content, but also enlarge the specific surface area of the petroleum pitch-based porous carbon. As a cheap and easily available catalyst for carbon dioxide electroreduction, up to 82% of Faradaic efficiency towards carbon monoxide was obtained at − 0.9 V vs the reversible hydrogen electrode in 0.1 M KHCO3. After a long time electrocatalysis of more than 20 h, the Faradaic efficiency of carbon monoxide remains 80%, indicating the porous carbon as made have an ultra-high stability as catalyst for carbon dioxide reduction. Our work provides a new technology to economically prepare efficient electrocatalysts for carbon dioxide reduction.
Zhengzhong Zhou,Lingli Zhou,Yi Liu,Qian Wang,Xiaoshan Meng,Qigang Wu,Taoli Huhe 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-
The technologies for enantiomeric resolution are essential to the development of pharmaceutical industry. The membrane technology has great potential in chiral separation owing to its low cost and highthroughput; however, the enantioselective of membrane is limited by the thickness of the active layer,which is closely related to the number of theoretical separation plates. In this work, the layered doublehydroxides (LDH) are synthesized by hydrothermal process and then vacuum filtrated with bcyclodextrin(b-CD) and polyvinyl alcohol (PVA) on a porous substrate to fabricate chiral selective membranes. 2D channels with increased number of separation stages are formed in the selective layer afterheat post-treatment. The enantiomeric excesses value is enhanced from 10.95% to 24.32% for racemicL/D- tryptophan resolution. This work provides a new approach for designing high performance chiralseparation membranes from the aspect of increasing the transport path.