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Quantum coherence and ground-state phase transition in a four-chain Bose–Hubbard model

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Communications in Theoretical Physics 2021年第8期73卷 182-188页

作者： Ji-guo Wang Lin-qi guo Ya-Fei Song Department of Mathematics and Physics Shijiazhuang TieDao UniversityShijiazhuang 050043China Institute of Applied Physics Shijiazhuang TieDao UniversityShijiazhuang 050043China

We study the quantum coherence and ground-state phase transition of a four-chain Bose–Hubbard model with the long-range interaction. In a special four-chain Bose–Hubbard model,i.e., each chain only has one optical potential, four types of the ground-state phases are discovered. The effects of the disorder, the on-site interaction and the long-range interaction on the quantum coherence are studied. For the system without the long-range interaction, the quantum coherence changes from one periodic oscillation to two periodic oscillations as the onsite interaction increases. By considering the long-range interaction, the quantum coherence goes back to one periodic oscillation again. The on-site interaction itself suppresses the quantum coherence, both the on-site interaction and long-range interaction together enhance the quantum coherence with the weak disorder. If the disorder strength is increased beyond a critical value,they start to suppress the quantum coherence. In a regular four-chain Bose–Hubbard model, i.e.,each chain has many optical potentials, the ground-state phase transitions are obtained by using the cluster Gutzwiller mean-field method. Exotic ground-state phases are found, i.e., superfluid phase, integer Mott insulator phase, supersolid phase and loophole insulator phase. The combination of the loophole insulator phase and the supersolid phase expands the lobes with the half-integer filling per site for the small ratio β = t_(‖)/t_(⊥).

关键词： Bose-Hubbard model quantum coherence ground-state phase transition

Sulfur cycle as an nitrate in a electron mediator between carbon and constructed wetland microcosm

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Frontiers of Environmental Science & Engineering 2020年第4期14卷 17-29页

作者： Wenrui guo Yue Wen Yi Chen qi zhou State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Key Laboratory of the Three Gorges Region's Eco-Environment Ministry of EducationCollege of Environment and EcologyChongqing UniversityChongqing 400044China

A constructed wetland microcosm was employed to investigate the sulfur cycle-mediated electron transfer between carbon and *** accepted electrons from organics at the average rate of 0.84 mol/(m3·d)through sulfate reduction,which accounted for 20.0%of the electron input *** remainder of the electrons derived from organics were accepted by dissolved oxygen(2.6%),nitrate(26.8%),and iron(III)(39.9%).The sulfide produced from sulfate reduction was transformed into acidvolatile sulfide,pyrite,and elemental sulfur,which were deposited in the substratum,storing electrons in the microcosm at the average rate of 0.52 mol/(m3·d).In the presence of nitrate,the acid-volatile and elemental sulfur were oxidized to sulfate,donating electrons at the average rate of 0.14 mol/(m3•d)and driving autotrophic denitrification at the average rate of 0.30 g N/(m3·d).The overall electron transfer efficiency of the sulfur cycle for autotrophic denitrification was 15.3%.A mass balance assessment indicated that approximately 50%of the input sulfur was discharged from the microcosm,and the remainder was removed through deposition(49%)and plant uptake(1%).Dominant sulfatereducing(i.e.,Desulfovirga,Desulforhopalus,Desulfatitalea,and Desulfatirhabdium)and sulfuroxidizing bacteria(i.e.,Thiohalobacter,Thiobacillus,Sulfuritalea,and Sulfurisoma),which jointly flilfilled a sustainable sulfur cycle,were *** results improved understanding of electron transfers among carbon,nitrogen,and sulfur cycles in constructed wetlands,and are of engineering significance.

关键词： Constructed wetland Sulfur cycle Electron transfer Denitrification

N-soliton solutions for the nonlocal two-wave interaction system via the Riemann–Hilbert method

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Chinese Physics B 2018年第12期27卷 157-163页

作者： Si-qi Xu Xian-guo Geng School of Mathematics and Statistics Zhengzhou UniversityZhengzhou 450001China College of Civil Engineering Xinyang Normal UniversityXinyang 464000China

In this paper, a nonlocal two-wave interaction system from the Manakov hierarchy is investigated via the Riemann–Hilbert approach. Based on the spectral analysis of the Lax pair, a Riemann–Hilbert problem for the nonlocal two-wave interaction system is constructed. By discussing the solutions of this Riemann–Hilbert problem in both the regular and nonregular cases, we explicitly present the N-soliton solution formula of the nonlocal two-wave interaction system. Moreover,the dynamical behaviour of the single-soliton solution is shown graphically.

关键词： nonlocal two-wave interaction system Riemann–Hilbert problem N-soliton solutions

Sound propagation in inhomogeneous waveguides with sound-speed profiles using the multimodal admittance method

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Chinese Physics B 2020年第1期29卷 346-356页

作者： qi Li Juan Liu Wei guo Acoustic Science and Technology Laboratory Harbin Engineering UniversityHarbin 150001China Key Laboratory of Marine Information Acquisition and Security(Harbin Engineering University) Ministry of Industry and Information TechnologyHarbin 150001China College of Underwater Acoustic Engineering Harbin Engineering UniversityHarbin 150001China

The multimodal admittance method and its improvement are presented to deal with various aspects in underwater acoustics,mostly for the sound propagation in inhomogeneous waveguides with sound-speed profiles,arbitrary-shaped liquid-like scatterers,and range-dependent *** all cases,the propagation problem governed by the Helmholtz equation is transformed into initial value problems of two coupled first-order evolution equations with respect to the modal components of field quantities(sound pressure and its derivative),by projecting the Helmholtz equation on a constructed orthogonal and complete local *** admittance matrix,which is the modal representation of Direchlet-to-Neumann operator,is introduced to compute the first-order evolution equations with no numerical instability caused by evanescent *** fourth-order Magnus scheme is used for the numerical integration of differential equations in the numerical *** numerical experiments of sound field in underwater inhomogeneous waveguides generated by point sources are ***,the numerical results computed by simulation software COMSOL Multiphysics are given to validate the correction of the multimodal admittance *** is shown that the multimodal admittance method is an efficient and stable numerical method to solve the wave propagation problem in inhomogeneous underwater waveguides with sound-speed profiles,liquid-like scatterers,and range-dependent *** extension of the method to more complicated waveguides such as horizontally stratified waveguides is available.

关键词： inhomogeneous waveguide multimodal admittance method sound-speed profiles admittance matrix

Harmoniousness analysis of total amount control of water use

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Water Science and Engineering 2014年第1期7卷 49-59页

作者： qian-qi YIN guo-hua FAng College of Water Conservancy and Hydropower Engineering Hohai University

Based on the fundamental principles of total amount control of water use, the harmony theory was used in this study to develop a concept of the degree of harmony of total amount control of water use. Based on this concept, the harmoniousness of total amount control of water use was analyzed in terms of the supply and demand of water resources, water resources management, water use benefits, and water-saving level. An evaluation index system of the degree of harmony of total amount control of water use was established, and a method for calculation of the degree of harmony of total amount control of water use was developed based on the analytic hierarchy process （AHP） and fuzzy comprehensive analysis （FCA） methods. The new evaluation index system was applied to a certain area in Jiangsu Province, China. The degree of harmony of total amount control of water use over this area was calculated for different years. Results indicate that the evaluation index system and calculation method proposed in this study are feasible, and such a harmoniousness analysis can provide scientific references for the strict water resources management system that will be implemented in China in the near future.

关键词： total amount control of water usel degree of harmony evaluation index system quantification method analytic hierarchy process method fuzzy comprehensive analysis method

R2N: A Novel Deep Learning Architecture for Rain Removal from Single Image

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Computers, Materials & Continua 2019年第3期58卷 829-843页

作者： Yecai guo Chen Li qi Liu School of Electronic and Information Engineering Nanjing University of Information Science and TechnologyNanjing Jiangsu210044China Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Nanjing Jiangsu210044China School of Computing Edinburgh Napier UniversityEdinburghEH105DTUK.

Visual degradation of captured images caused by rainy streaks under rainy weather can adversely affect the performance of many open-air vision ***,it is necessary to address the problem of eliminating rain streaks from the individual rainy *** this work,a deep convolution neural network(CNN)based method is introduced,called Rain-Removal Net(R2N),to solve the single image de-raining ***,we decomposed the rainy image into its high-frequency detail layer and lowfrequency base ***,we used the high-frequency detail layer to input the carefully designed CNN architecture to learn the mapping between it and its corresponding derained high-frequency detail *** CNN architecture consists of four convolution layers and four deconvolution layers,as well as three skip *** experiments on synthetic and real-world rainy images show that the performance of our architecture outperforms the compared state-of-the-art de-raining models with respects to the quality of de-rained images and computing efficiency.

关键词： Deep learning convolution neural networks rain streaks single image deraining skip connection.

The role of galectin-4 in physiology and diseases

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Protein & Cell 2016年第5期7卷 314-324页

作者： zhan-qi Cao Xiu-Li guo Department of Pharmacology School of Pharmaceutical Sciences Shandong University Jinan 50012 China

Galectin-4, a tandem repeat member of the β-galactoside-binding proteins, possesses two carbohydraterecognition domains （CRD） in a single peptide chain. This lectin is mostly expressed in epithelial cells of the intestinal tract and secreted to the extracellular. The two domains have 40% similarity in amino acid sequence, but distinctly binding to various ligands. Just because the two domains bind to different ligands simultaneously, galectin-4 can be a crosslinker and crucial regulator in a large number of biological processes. Recent evidence shows that galectin-4 plays an important role in lipid raft stabilization, protein apical trafficking, cell adhesion, wound healing, intestinal inflammation, tumor progression, etc. This article reviews the physiological and pathological features of galectin-4 and its important role in such processes.

关键词： galectin-4 lipid raft crosslinker intestinalinflammation tumor progression

Continuous Sign Language Recognition Based on Spatial-Temporal Graph Attention Network

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Computer Modeling in Engineering & Sciences 2023年第3期134卷 1653-1670页

作者： qi guo Shujun zh.ng Hui Li College of Information Science and Technology Qingdao University of Science and TechnologyQingdao266061China

Continuous sign language recognition(CSLR)is challenging due to the complexity of video background,hand gesture variability,and temporal modeling *** work proposes a CSLR method based on a spatialtemporal graph attention network to focus on essential features of video *** method considers local details of sign language movements by taking the information on joints and bones as inputs and constructing a spatialtemporal graph to reflect inter-frame relevance and physical connections between *** graph-based multihead attention mechanism is utilized with adjacent matrix calculation for better local-feature exploration,and short-term motion correlation modeling is completed via a temporal convolutional *** adopted BLSTM to learn the long-termdependence and connectionist temporal classification to align the word-level *** proposed method achieves competitive results regarding word error rates(1.59%)on the Chinese Sign Language dataset and the mean Jaccard Index(65.78%)on the ChaLearn LAP Continuous Gesture Dataset.

关键词： Continuous sign language recognition graph attention network bidirectional long short-term memory connectionist temporal classification

Antibonding orbital tailor and stress relief engineering for FeS_(2)complex toward superior sodium storage

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Rare Metals 2024年第10期43卷 5048-5059页

作者： You-Bin zh.ng zhen-guo qi Fu-Sheng Liu guo-Hui qin State Key Laboratory Base for Eco-Chemical Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China Shandong Synergetic Innovation Center of Ecological and Chemical Engineering Qingdao 266042China

The sluggish kinetics behaviors and vast volume variations of Na^(+)hosts to FeS_(2)anode involved intercalation,and conversion reactions plague its applicability of sodium-ion batteries(SIBs).Here,a significantly expedited kinetics via cation intercalation and considerably relieved stress accumulation by constructing the concave scaffold protector are approached for FeS_(2)*** Mn^(2+)intercalation into FeS_(2),a new stable Mn-FeS_(2)was generated with distorted coordination;elevated antibonding orbital occupancy and lowed d band center to the release of more free Na^(+)were achieved,which was further encapsulated by hollow bowl-like carbon spheres(BC)This cation intercalation and concave morphology strategies confer Mn-FeS_(2)@BC significantly enhanced electron ion transport kinetics via reversed electron transfer to FeS_(2)fast desolvation kinetics,and evidently depressed structural deformation during Na^(+)insertion and ***,Mn-FeS_(2)@BC delivers the longevity and stable Na^(+)storage capacity in both half and full cell ***,Mn-FeS_(2)@BC also displays excellen adaptability in a wider temperature *** work proposes new views into the deep regulation of electrochemical performance of transition metal anodes via intercalation chemistry and concave engineering.

关键词： FeS_(2) Intercalation chemistry Concave engineering Sodium capture