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- 저자 : Qingwei Li* (검색결과 14 건)
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Li, Qingwei,Chen, Fang,Zhao, Weili,Xu, Mingxiu,Fang, Benjie,Zhang, Yuelong,Duo, Liping,Jin, Yuqi,Sang, Fengting Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.10
Using solid inorganic peroxides (including Li2O2, Na2O2, SrO2 and BaO2) as starting materials, three reaction paths for singlet oxygen (1O2) production were developed and studied. Their 1O2 emission spectra in the near- IR region and visible region from these reaction paths were simultaneously recorded by a near-IR sensitive Optical Multichannel Analyzer and a visible sensitive Optical Spectrum Analyzer, respectively. The comparison of their 1O2 emission spectra indicated that: (1) in term of the efficiency for 1O2 production, the gasliquid- solid reaction path (in which Cl2 or HCl and H2O reacted with the solid inorganic peroxides suspension in CCl4) was prior to the gas-solid reaction path (in which Cl2 or HCl reacted with the solid inorganic peroxides suspension in CCl4), but was inferior to the gas-liquid reaction path (in which Cl2 or HCl reacted with the solid inorganic peroxides solution in H2O or D2O); (2) the alkali metal peroxides (such as Li2O2 and Na2O2) was prior to the alkaline earth metal peroxides (such as SrO2 and BaO2) as the solid reactants, and Cl2 was favorable than HCl as the gas reactant in efficiency for 1O2 production in these reaction paths.
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Qingwei Li*,Fang Chen,Weili Zhao,Mingxiu Xu,Benjie Fang,Yuelong Zhang,Liping Duo,Yuqi Jin,Fengting Sang 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.10
Using solid inorganic peroxides (including Li2O2, Na2O2, SrO2 and BaO2) as starting materials, three reaction paths for singlet oxygen (1O2) production were developed and studied. Their 1O2 emission spectra in the near-IR region and visible region from these reaction paths were simultaneously recorded by a near-IR sensitive Optical Multichannel Analyzer and a visible sensitive Optical Spectrum Analyzer, respectively. The comparison of their 1O2 emission spectra indicated that: (1) in term of the efficiency for 1O2 production, the gas-liquid-solid reaction path (in which Cl2 or HCl and H2O reacted with the solid inorganic peroxides suspension in CCl4) was prior to the gas-solid reaction path (in which Cl2 or HCl reacted with the solid inorganic peroxides suspension in CCl4), but was inferior to the gas-liquid reaction path (in which Cl2 or HCl reacted with the solid inorganic peroxides solution in H2O or D2O); (2) the alkali metal peroxides (such as Li2O2 and Na2O2) was prior to the alkaline earth metal peroxides (such as SrO2 and BaO2) as the solid reactants, and Cl2 was favorable than HCl as the gas reactant in efficiency for 1O2 production in these reaction paths.
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Li, Qian,Wang, Jinghua,Yan, Shiqiang,Gong, Jiaye,Ma, Qingwei Techno-Press 2018 Ocean systems engineering Vol.8 No.4
This paper presents a hybrid numerical approach, which combines a two-phase Navier-Stokes model (NS) and the fully nonlinear potential theory (FNPT), for modelling wave-structure interaction. The former governs the computational domain near the structure, where the viscous and turbulent effects are significant, and is solved by OpenFOAM/InterDyMFoam which utilising the finite volume method (FVM) with a Volume of Fluid (VOF) for the phase identification. The latter covers the rest of the domain, where the fluid may be considered as incompressible, inviscid and irrotational, and solved by using the Quasi Arbitrary Lagrangian-Eulerian finite element method (QALE-FEM). These two models are weakly coupled using a zonal (spatially hierarchical) approach. Considering the inconsistence of the solutions at the boundaries between two different sub-domains governed by two fundamentally different models, a relaxation (transitional) zone is introduced, where the velocity, pressure and surface elevations are taken as the weighted summation of the solutions by two models. In order to tackle the challenges associated and maximise the computational efficiency, further developments of the QALE-FEM have been made. These include the derivation of an arbitrary Lagrangian-Eulerian FNPT and application of a robust gradient calculation scheme for estimating the velocity. The present hybrid model is applied to the numerical simulation of a fixed horizontal cylinder subjected to a unidirectional wave with or without following current. The convergence property, the optimisation of the relaxation zone, the accuracy and the computational efficiency are discussed. Although the idea of the weakly coupling using the zonal approach is not new, the present hybrid model is the first one to couple the QALE-FEM with OpenFOAM solver and/or to be applied to numerical simulate the wave-structure interaction with presence of current.
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Yutao Li,Qingwei Guo,Yaodong Jiang,Bo Zhang,Xuehua Li 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.5
Pore-fracture is an important component of coal, affecting the uniaxial compression failure behavior. However, it is difficult to effectively characterize the influence mechanism because of the complexity and randomness of components in coal. In this paper, scanning electron microscope (SEM), computed tomography (CT), indentation hardness and uniaxial compressiontests are conducted for specimens with high, medium and no bursting proneness to investigate it. The results indicate that distribution of three components (matrix, minal and pore-fracture) in specimens are extremely different, which is the embodiment of tectonic structure activity and geological condition of mineralization. The levels of bursting proneness of coal, the tectonic structure features, tectonic structure activities and external functions are related. 3-D reconstruction on the basis of CT images can visualize internal complex structure of specimens. The numerical simulation results demonstrate that distribution of pore-fracture, mechanical properties of matrix and minal are significant inducement of specimen’s failure difference in the identical loading mode. Main failure mode of specimens with high, medium and no bursting proneness are different, which proves that main failure mode of specimen correlates with its mechanical properties. The mechanical failure behavior of specimen under uniaxial compression is influenced by loading mode, mechanical properties of matrix and minal, pore-fracture feature and other considerations. The loading mode is extrinsic cause of mechanical failure behavior of specimens, also an inducing factor and could be intervened. Furthermore, mechanical properties of matrix and minal determine bearing capacity and ultimate failure mode of specimens. Primary pore-fracture seriously affects extension process and extension mode of secondary pore-fracture, and the internal damage development of specimens. Notably, coal composed by the convergence of matrix, minal and pore-fracture, all these are internal cause of mechanical failure behavior of specimens, which belong to basic factors and hard to be intervened.
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Xue Lin,Xiaoyu Guo,Di Liu,Qingwei Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.2
Ag/Bi4Ti3O12 heterostructure with high photocatalytic activity was synthesized via a simple and practical hydrothermal method by using Bi4Ti3O12 nanobelts as substrate materials. The as-prepared Ag/Bi4Ti3O12 heterostructure included Ag quantum dots assembling uniformly on the surface of Bi4Ti3O12 nanobelts. Comparing with pure Bi4Ti3O12 nanobelts, the composite photocatalyst exhibited enhanced photocatalytic activity under visible light irradiation in the decomposition of rhodamine B aqueous solution. The enhancement performance is believed to be induced by the intimate contact interface, where silver quantum dots serve as good electron acceptor for facilitating quick photoexcited electron transfer and thus decreasing electron-hole recombination. It was also found that the photodegradation of rhodamine B molecules is mainly attributed to the oxidation action of the generated O2 radicals.
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Yue Pang,Rong Xiao,Xin Liu,Qingwei Li 한국유전학회 2012 Genes & Genomics Vol.34 No.6
High-mobility group family (HMG) genes are ubiquitous in vertebrates, including mammals, birds, amphibians and fishes. To elucidate the molecular phylogeny of the HMG genes in the primitive vertebrate, we have cloned three homologues of HMG-box genes, called Lj-HMGB1, Lj-HMGB2 and Lj-HMGBX, from a cDNA library generated from lymphocyte-like cells of the Japanese lamprey (Lampetra japonica),an Agnathan that occupies a critical phylogenetic position between invertebrates and vertebrates. The open reading frames of Lj-HMGB1, Lj-HMGB2 and Lj-HMGBX contained 627 bp,585 bp and 678 bp, respectively. The analysis of the deduced amino acid sequences indicated that these three putative Lj-HMGB proteins contain four domains: HMG-box A,HMG-box B, an acidic carboxyl-terminal tail and a linker. A phylogenetic analysis revealed that the Lj-HMGB proteins fall outside the vertebrate clade; Lj-HMGBX is descended from a gene ancestral to the mammalian HMGB1/2/3. This discovery implies that there was a gene duplication event in the HMGB1/2/3 gene family that occurred after the divergence of the vertebrates (Cyclostomata) from the Cephalochordata and Urochordata at least 450 million years ago (MYA). The Lj-HMGB1, Lj-HMGB2 and Lj-HMGBX genes were detected in most tissues of the lamprey by RT-PCR. Our findings provide insight into the phylogeny of the HMGB genes in vertebrates.
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Algorithm of Gaussian Sum Filter Based on SGQF for Nonlinear Non-Gaussian Models
Chen Qian,Chengying Song,Sheng Li,Qingwei Chen,Jian Guo 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.8
To improve the filtering effect of the sparse grid quadrature filter (SGQF) under non-Gaussian conditions, the Gaussian sum technique is introduced, and the Gaussian sum sparse grid quadrature filter (GSSGQF) is developed. We present a systematic formulation of the SGQF and extend it to the discrete-time nonlinear system with the non-Gaussian noise. The proposed algorithm approximates the non-Gaussian probability densities by a finite number of weighted sums of Gaussian densities, and takes the SGQF as the Gaussian sub-filter to conduct the timeand measurement update for each Gaussian component. An application in the discrete-time nonlinear system with the non-Gaussian noise has been shown to demonstrate the accuracy of the GSSGQF. It outperforms the unscented Kalman filter (UKF), the cubature Kalman filter (CKF) and the SGQF. Theoretical analysis and simulation results prove that the GSSGQF provides significant performance improvement in the calculation accuracy for nonlinear non-Gaussian filtering problems.
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