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3D contaminant migration model with consolidation dependent transport coefficients

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Acta Mechanica Sinica 2012年第1期28卷 151-163页

作者： Lu Huang Cheng-gang Zhao Yan Liu Guo-qing Cai School of Civil Engineering&Architecture Southwest Petroleum University610500 ChengduChina Department of Civil Engineering&Architecture Beijing Jiaotong University100044 BeijingChina

Soil consolidation would induce variations of its transport coefficients such as hydraulic conductivity and diffusion coefficient. This paper presents a study of the influence of barrier consolidation on transport coefficients, and a 3D transport model based on mixture theory is proposed for describing the liners that involve circular defects in the geomembrane. The elastoplastic ALPHA model is revised by using the spatially mobilized plane （SMP） criterion for simulating the deformation of the soils. Then, the 3D model coupling the nonlinear consolidation and contaminant advection-diffusion is solved using the finite element software ABAQUS. The results show that the importance of reducing the defect size in the geomembrane and the liner porosity to control the contaminant concentration increase

关键词： Porosity Contaminant transport. Consolidation Nonlinearity Elastoplasticity

Optimum of Interleaving Schemes over Combined Channels

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Wuhan University Journal of Natural Sciences 1999年第3期4卷 304-306页

作者： qiao Qin-bao Weng qing Yu Jin Wuhan Univ Wuhan China

The optimum choice of key parameters in the interleaving schemes used in RS codes/Viterbi-decoded convolutional codes concatenated coding systems is discussed. At the same time the simulation results and other optiona... 详细信息

关键词： digital interleave concatenated code combined channel

Stability of Navier–Stokes System with Singular External Force in Fourier–Herz Space

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Acta Mathematica Sinica,English Series 2023年第7期39卷 1203-1218页

作者： De Zai MIN qing Kai WANG gang WU Zhuo Ya YAO School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049P.R.China

We prove the asymptotic properties of the solutions to the 3D Navier–Stokes system with singular external force, by making use of Fourier localization method, the Littlewood–Paley theory and some subtle estimates in Fourier–Herz space. The main idea of the proof is motivated by that of Cannone et al. [J. Differential Equations, 314, 316–339(2022)]. We deal either with the nonstationary problem or with the stationary problem where solution may be singular due to singular external force. In this paper, the Fourier–Herz space includes the function space of pseudomeasure type used in Cannone et al. [J. Differential Equations, 314, 316–339(2022)]

关键词： 3D Navier–Stokes equations Fourier–Herz spaces singular external force Littlewood–Paley theory stability

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Recent progress in two-proton radioactivity

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Nuclear Science and Techniques 2022年第8期33卷 118-146页

作者： Long Zhou Si-Min Wang De-qing Fang Yu-gang Ma Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai 200438China

During the last few decades,rare isotope beam facilities have provided unique data for studying the properties of nuclides located far from the beta-stability *** nuclei are often accompanied by exotic structures and radioactive modes,which represent the forefront of nuclear *** them,two-proton(2p)radioactivity is a rare decay mode found in a few highly proton-rich *** 2p decay lifetimes and properties of emitted protons hold invaluable information regarding the nuclear structures in the presence of a low-lying proton continuum;as such,they have attracted considerable research *** this review,we present some of the recent experimental and theoretical progress regarding the 2p decay,including technical innovations for measuring nucleon-nucleon correlations and developments in the models that connect their structural aspects with their decay *** impressive progress should play a significant role in elucidating the mechanism of these exotic decays,probing the corresponding components inside nuclei,and providing deep insights into the open quantum nature of dripline systems.

关键词： Exotic decay Two-proton radioactivity Nucleon-nucleon correlation Experimental and theoretical development

Dexmedetomidine mediates the mechanism of action of ferroptosis in mice with Alzheimer’s disease by regulating the mTOR-TFR1 pathway

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World Journal of Psychiatry 2023年第8期13卷 511-523页

作者： Li qiao gang Li Hong-Xun Yuan Intensive Care Unit Peking University International HospitalBeijing 102206China

BACKGROUND Alzheimer’s disease(AD)is the most common neurodegenerative disorder,and there are currently no effective drugs to delay progression of the *** may play a vital part in AD,and is therefore receiving increasing attention by *** To investigate the effects of dexmedetomidine(Dex)on ferroptosis in AD mouse *** Hippocampal neurons(HNs)HT22 were induced by amyloidβ-protein(Aβ)and both in vitro and in vivo AD mouse models were prepared via *** cellcounting kit-8 assay and immunofluorescence technique were adopted to determine cell proliferation activity and intracellular Fe2+levels,and the TBA method and microplate method were employed for malondialdehyde and glutathione measurements,*** tissue damage was determined using hematoxylin and eosin and Nissl *** learning and memory ability in each group was assessed by the Morris water maze test,and the expression levels of mammalian target of rapamycin(mTOR)signal molecules and ferroptosis-related proteins transferrin receptor 1(TFR1),SLC7A11 and glutathione peroxidase 4 were examined by western *** Dex enhanced lipid peroxidation and iron influx in mouse HNs in both in vitro and in vivo experiments,while inhibition of the mTOR axis blocked this *** findings demonstrate that Dex can inhibit ferroptosis-induced damage in mouse HNs by activating mTOR-TFR1 signaling to regulate ferroptosis-associated proteins,thus alleviating cognitive dysfunction in AD *** Dex can activate the mTOR-TFR1 axis to inhibit ferroptosis in mouse HNs,thereby improving the learning and memory ability of mice.

关键词： Dexmedetomidine Ferroptosis Alzheimer’s disease Mammalian target of rapamycin Mice

Helmholtz decomposition with a scalar Poisson equation in elastic anisotropic media

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Petroleum Science 2024年第3期21卷 1597-1610页

作者： Xin-Yu Fang gang Yao qing-qing Zheng Ping-Min Zhang Di Wu Feng-Lin Niu State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China Unconventional Petroleum Research Institute China University of Petroleum(Beijing)Beijing102249China Department of Mathematics College of ScienceChina University of Petroleum(Beijing)Beijing102249China College of Geophysics China University of Petroleum(Beijing)Beijing102249China Department of Earth Environmental and Planetary SciencesRice UniversityHoustonTX77005UA

P-and S-wave separation plays an important role in elastic reverse-time *** can reduce the artifacts caused by crosstalk between different modes and improve image *** addition,P-and Swave separation can also be used to better understand and distinguish wave types in complex *** present,the methods for separating wave modes in anisotropic media mainly include spatial nonstationary filtering,low-rank approximation,and vector Poisson *** of these methods require multiple Fourier transforms or the calculation of large matrices,which require high computational costs for problems with large *** this paper,an efficient method is proposed to separate the wave mode for anisotropic media by using a scalar anisotropic Poisson operator in the spatial *** 2D problems,the computational complexity required by this method is 1/2 of the methods based on solving a vector Poisson ***,compared with existing methods based on pseudoHelmholtz decomposition operators,this method can significantly reduce the computational *** examples also show that the P and S waves decomposed by this method not only have the correct amplitude and phase relative to the input wavefield but also can reduce the computational complexity significantly.

关键词： Anisotropic media Scalar anisotropic Poisson equation Improved elastic wavefield decomposition

Safety Risk Assessment of Overturning Construction of Towering Structure Based on Cloud Matter–Element Coupled Model

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Computer Modeling in Engineering & Sciences 2023年第8期136卷 1973-1998页

作者： Yingxue Sang Fengxia Han qing Liu Liang qiao Shouxi Wang School of Architecture and Engineering Xinjiang UniversityUrumqi830017China Xinjiang Key Lab of Building Structure and Earthquake Resistance Urumqi830017China China Railway No.21 Bureau Group No.1 Engineering Co. Ltd.Urumqi830026China

Rapid urbanization has led to a surge in the number of towering structures,and overturning is widely used because it can better accommodate the construction of shaped structures such as variable *** complexity of the construction process makes the construction risk have certain randomness,so this paper proposes a cloudbased coupled matter-element model to address the ambiguity and randomness in the safety risk assessment of overturning construction of towering *** the pretended model,the digital eigenvalues of the cloud model are used to replace the eigenvalues in the matter–element basic element,and calculate the cloud correlation of the risk assessment metrics through the correlation algorithm of the cloud model to build the computational ***,the improved hierarchical analysis method based on the cloud model is used to determine the weight of the *** comprehensive evaluation scores of the evaluation event are then obtained through the weighted average method,and the safety risk level is determined *** empirical analysis,(1)the improved hierarchical analysis method based on the cloud model can incorporate the data of multiple decisionmakers into the calculation formula to determine theweights,which makes the assessment resultsmore credible;(2)the evaluation results of the cloud-basedmatter-element coupledmodelmethod are basically consistent with those of the other two commonly used methods,and the confidence factor is less than 0.05,indicating that the cloudbased physical element coupled model method is reasonable and practical for towering structure overturning;(3)the cloud-based coupled element model method,which confirms the reliability of risk level by performing Spearman correlation on comprehensive assessment scores,can provide more comprehensive information of instances compared with other methods,and more comprehensively reflects the fuzzy uncertainty relationship between assessment indexes,which makes th

关键词： Cloud matter-element model clouded hierarchical analysis method towering structure overturning formwork construction risk assessment

Dynamic Wnt5a expression in murine hair follicle cycle and its inhibitory effects on follicular in vivo

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Asian Pacific Journal of Tropical Medicine 2014年第4期7卷 285-288页

作者： De-Ren Fang Zhong-Fa Lv gang qiao Department of Dermatology the First Affiliated HospitalCollege of MedicineZhejiang University Department of Dermatology the Second Affiliated HospitalCollege of MedicineZhejiang University Department of Dermatology the Third People's Hospital of Hanghzhou

Objective:To analyze the dynamic expression of Wnt family member 5A(Wingless-type MMTV integration Wnt site family,member 5a)in murine hair cycle and its inhibitory effects on follicle in ***:Situ hybridization in full-thickness skin was used to observe the change of mouse protein expression in different growth stages,and Ad-Wnt5a was injected after defeathering to observe the hair follicle growth in ***:The Wnt5a mRNA was expressed at birth,and was firstly increased then decreased along with the progress of the hair *** reached the peak in advanced stage of growth cycle(P<0.05).Rhoa andβ-catenin expression levels were significantly decreased in three ***2 expression was significantly up-regulated,and the expression level of Wnt5a,Shh and Frizzled2 was increased,but less significantly than group ***:The expression of Wnt5a mRNA is consistent with change of murine follicle cycle,and has obvious inhibitory effects on the growth of hair follicle in vivo,indicating that it is antagonistic to Wnts pathway and interferes the growth of follicle together.

关键词： Wnt5a Hair follicle cycle Iinhibition Proliferation

The atlas of ferroicity in two-dimensional MGeX_(3) family:Room-temperature ferromagnetic half metals and unexpected ferroelectricity and ferroelasticity

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Nano Research 2021年第12期14卷 4732-4739页

作者： Kuan-Rong Hao Xing-Yu Ma Hou-Yi Lyu Zhen-gang Zhu qing-Bo Yan gang Su School of Physical Sciences University of Chinese Academy of SciencesBeijing100049China School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing100049China Center of Materials Science and Optoelectronics Engineering College of Materials Science and Optoelectronic TechnologyUniversity of Chinese Academy of SciencesBeijing100049China Kavli Institute for Theoretical Sciences and CAS Center of Excellence in Topological Quantum ComputationUniversity of Chinese Academy of SciencesBeijing100190China

Two-dimensional(2D)ferromagnetic and ferroelectric materials attract unprecedented attention due to the spontaneous-symmetry-breaking induced novel properties and multifarious potential *** we systematically investigate a large family(148)of 2D MGeX3(M=metal elements,X=O/S/Se/Te)by means of the high-throughput first-principles calculations,and focus on their possible ferroic properties including ferromagnetism,ferroelectricity,and *** discover eight stable 2D ferromagnets including five semiconductors and three half-metals,212D antiferromagnets,and 11 stable 2D ferroelectric semiconductors including two multiferroic ***,MnGeSe3 and MnGeTe3 are predicted to be room-temperature 2D ferromagnetic half metals with Tc of 490 and 308 K,*** is probably for the first time that ferroelectricity is uncovered in 2D MGeX3 family,which derives from the spontaneous symmetry breaking induced by unexpected displacements of Ge-Ge atomic pairs,and we also reveal that the electric polarizations are in proportion to the ratio of electronegativity of X and M atoms,and IVB group metal elements are highly favored for 2D *** tunnel junction and water-splitting photocatalyst based on 2D ferroic MGeX3 are proposed as examples of wide potential *** atlas of ferroicity in 2D MGeX3 materials will spur great interest in experimental studies and would lead to diverse applications.

关键词： two-dimensional materials ferroicity ferroelectricity ferroelasticity ferromagnetic half metal