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Exact Solution of a Backward Scattering Kondo Model

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Chinese Physics Letters 1996年第9期13卷 703-706页

作者： WANG Yu-peng PU Fu-ke Cryogenic Laboratory Chinese Academy of SciencesBeijing 100080 Department of Physics Guangzhou Teachers’CollegeGuangzhou 510400 Institute of Physics Chinese Academy of SciencesBeijing 100080

To specify the difference between the one-dimensional Kondo problem and the three-dimensional Kondo problem,we consider a model which describes the interaction between one-dimensional free electrons and a magnetic *** ansatz exact results and scaling analysis show that if J_(F)>-|J_(B)|,the Kondo screening *** is no ferromagnetic Kondo screening in such a system but the long range antiferromagnetic Kondo coupling is *** soon as the Coulomb interaction is introduced,the crossovers between the scaling trajectories in the parameter region J_(F)<-|J_(B)|and the trajectories in other parameter regions arise and ferromagnetic Kondo screening may occur.

关键词： Kondo ferromagnetic scaling

Targeting long non-coding RNA MALAT1 alleviates retinal neurodegeneration in diabetic mice

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International Journal of Ophthalmology(English edition) 2020年第2期13卷 213-219页

作者： Yu-Lan Zhang Han-Ying Hu zhi-peng You Bing-Yang Li ke Shi Department of Ophthalmology the Second Affiliated HospitalNanchang UniversityNanchang 330006Jiangxi ProvinceChina

●AIM:To observe the effect of inhibiting long non-coding RNA(lncRNA)metastasis-associated lung adenocarcinoma transcript 1(MALAT1)on diabetic neurodegeneration.●METHODS:Thirty-six 8-week-old C57 BL/6 mice were randomly divided into normal control,diabetic control,diabetic scrambled small interfering RNAs(siRNAs)and diabetic MALAT1-siRNA *** diabetic induction with streptozocin intraperitoneally-injection,the diabetic M A L AT 1-s i R N A g ro u p w a s i n t r av i t r e a l l y i n j e c te d with 1μL 20μmol/L MALAT1 siRNA,and the diabetic scrambled siRNA group was injected with the same amount of scrambled *** was performed to examine photoreceptor functions 16 wk after diabetes ***1 expression was detected via real time polymerase chain *** morphological changes were examined using *** morphological changes were examined by determining outer nuclear layer(ONL)thickness.●RESULTS:The upregulation of retinal MALAT1 expression was detected in the diabetic control mice,while MALAT1 expression in the diabetic MALAT1-siRNA mice was decreased by 91.48%compared to diabetic control *** diabetic MALAT1-siRNA and diabetic control mice showed lower a-wave and b-wave amplitudes than did the normal control mice in scotopic and photopic electroretinogram,while the diabetic MALAT1-siRNA mice showed higher amplitudes than diabetic control *** examination revealed that ONL thickness in the diabetic MALAT1-siRNA and diabetic control mice was lower than normal control ***,ONL thickness was greater in the diabetic MALAT1-siRNA mice than diabetic control ***,the diabetic control mice performed a sparser cone cell arrangement and shorter outer segment morphology than diabetic MALAT1-siRNA mice.●CONCLUSION:Inhibiting retinal MALAT1 results in mitigative effects on the retinal photoreceptors,thus alleviating diabetic neurodegeneration.

关键词： long non-coding RNA MALAT1 small interfering RNA diabetic retinopathy neurodegeneration

NUMERICAL SIMULATION OF PROPAGATION AND BREAKING PROCESSES OF A FOCUSED WAVES GROUP

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Journal of Hydrodynamics 2012年第3期24卷 399-409页

作者： HUANG Zong-liu LIN peng-zhi State key Laboratory of Hydraulics and Mountain River Engineering Sichuan University Chengdu 610065China

A two-dimensional numerical wave flume is developed to study the focused waves group propagation and the consequent breaking processes. The numerical model is based on the Reynolds-Averaged Navier-Stokes （PANS） equations, with the standard k - c turbulence model to simulate the turbulence effects. To track the complicated and broken free-surface, the Volume Of Fluid （VOF） method is employed. The numerical model combines the ＂Partial Cell Treatment （PCT）＂ method with the ＂Locally Relative Stationary （LRS）＂ concept to treat the moving wave paddle so that various waves can be generated directly in a fixed Cartesian grid system. The theoretical results of the linear and nonlinear waves are used to validate the numerical wave flume firstly, and then a plunging breaking wave created by a focused waves group is simulated. The numerical results are compared to the experimental data and other simulation results, with very good agreements. The turbulence intensity, the flow field and the energy dissipation in the breaking processes are analyzed based on the numerical results. It is shown that the present numerical model is efficient and accurate for studying the waves group generation, the waves packet propagation, and the wave breaking processes.

关键词： focused waves group plunging breaking Volume Of Fluid (VOF) k - ε turbulence model irregular wave maker

Numerical Simulation of the Vortex-Induced Vibration of A Curved Flexible Riser in Shear Flow

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China Ocean Engineering 2018年第3期32卷 301-311页

作者： ZHU Hong-jun LIN peng-zhi State key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University State key Laboratory of Hydraulics and Mountain River Engineering Sichuan University

A series of fully three-dimensional(3 D) numerical simulations of flow past a free-to-oscillate curved flexible riser in shear flow were conducted at Reynolds number of 185–1015. The numerical results obtained by the two-way fluid–structure interaction(FSI) simulations are in good agreement with the experimental results reported in the earlier study. It is further found that the frequency transition is out of phase not only in the inline(IL) and crossflow(CF) directions but also along the span direction. The mode competition leads to the non-zero nodes of the rootmean-square(RMS) amplitude and the relatively chaotic trajectories. The fluid–structure interaction is to some extent reflected by the transverse velocity of the ambient fluid, which reaches the maximum value when the riser reaches the equilibrium position. Moreover, the local maximum transverse velocities occur at the peak CF amplitudes, and the values are relatively large when the vibration is in the resonance regions. The 3 D vortex columns are shed nearly parallel to the axis of the curved flexible riser. As the local Reynolds number increases from 0 at the bottom of the riser to the maximum value at the top, the wake undergoes a transition from a two-dimensional structure to a 3 D one. More irregular small-scale vortices appeared at the wake region of the riser, undergoing large amplitude responses.

关键词： vortex-induced vibration flexible riser shear flow fluid–structure interaction computational fluid dynamics

Microspheres trigged-stress concentration regulating piezoelectric properties of PVDF/elastomer composites

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Science China Chemistry 2025年

作者： Wenxian Zhang Jiahong Yang Qijun Sun Lu peng Tong Lin Shouke Yan Xiaoli Sun State key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences State key Laboratory of Separation Membranes and Membrane Processes School of Textile Science and EngineeringTiangong University key Laboratory of Rubber-Plastics of Ministry of Education Shandong Provincial Key Laboratory of Rubber-PlasticsQingdao University of Science & Technology

Wearable self-powered piezoelectric pressure sensors are attracting tremendous ***,fabricating a high-sensitive elastic piezoelectric sensor for a broad response range remains ***,we assemble polar poly（vinylidene fluoride）(PVDF) microsphere-elastomer composites,achieving high-sensitive and wide-responsive pressure *** polar PVDF microspheres are produced cost-effectively through phase separation,enabling *** piezoelectric composite （PC） film demonstrates low Young’s modulus,and excellent anti-fatigue ***,the PC-based piezoelectric sensor exhibits a rather high sensitivity of 540 mV N-1in a wide sensing range （5–40 N）,240 times greater than the PVDF film-based sensor and comparable to the inorganic piezoelectric *** excellent performance is attributed to the highest average stress concentration on the spherical PVDF coupled with the remarkable deformation of dipoles of spherical PVDF in the flexible *** on excellent performance,this piezoelectric sensor achieves precise recognition of motions and sound *** high-sensitive flexible piezoelectric sensor enabling large area production with ultralow price exerts great potential in smart monitoring and intelligent robots.

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Depth-resolved numerical model of dam break mud flows with Herschel-Bulkley rheology

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Journal of Mountain Science 2022年第4期19卷 1001-1017页

作者： TANG Jin-bo LIN peng-zhi CUI peng State key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu 610065China key Laboratory of Mountain Hazards and Earth Surface Processes Chinese Academy of SciencesInstitute of Mountain Hazards and EnvironmentChinese Academy of Sciences and Ministry of Water ConservancyChengdu 610041China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China

Mud flows are common phenomena in mountainous areas,which can threaten human safety and cause property losses under certain extreme *** the dynamic characteristics of mud flows,especially in the vertical direction,is helpful for risk reduction and hazard *** this study,a 2D depth-resolved numerical model based on Herschel-Bulkley rheology was developed to study the vertical structures of unsteady mud flows with a *** numerical model was solved by the projection method,and the free surface of mud flows was captured through the VOF *** fully validate this new model,a series of laboratory experiments involving dam break mud flows were conducted,and the mud flow heights,bottom pressures and envelopes of mud residuum were *** numerical model proposed in this study was first validated by the steady-state solution for uniform flows of Herschel-Bulkley fluid on an inclined ***,the simulated and measured mud flow heights,bottom pressures at different x locations and envelopes with different bed slopes showed good ***,the numerical results for a Herschel-Bulkley fluid dam break flow were used to validate the proposed model,which further revealed good *** that,the scenarios in which mud flows impact on a structure were numerically studied,and the vertical profiles of the front velocity and impact pressure on the structure were analyzed and *** results show that a plug layer was formed in the mud flow under unsteady and nonuniform flow conditions,and the impact pressure on the structure was dominated by the dynamic *** addition,the vertical position with the maximum impact pressure acting on the structure was not at the bottom or the surface of the mud flows,and the normalized vertical position rose as the yield stress and consistency coefficient increase for Herschel-Bulkley fluids.

关键词： Mud flows Herschel-Bulkley rheology Depth-resolved model Numerical simulation Vertical profiles

Nanoscale superconductivity of ?-Ga islands grown by molecular beam epitaxy

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Science China(Physics,Mechanics & Astronomy) 2015年第10期58卷 89-93页

作者： ZHANG HuiMin peng JunPing GUAN JiaQi LI zhi SONG CanLi WANG LiLi HE ke MA XuCun XUE QiKun Institute of Physics Chinese Academy of Sciences State key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Collaborative Innovation Center for Quantum Matter

We report on the preparation and superconductivity of metastable γ-Ga islands on Si(111) substrate. The Ga grows in a typical Volmer-Weber mode at a low temperature of 110 K, resulting in formation of Ga nanoislands at various sizes with the identical γ-phase. In-situ low temperature scanning tunneling spectra reveal quantized electronic states in ultrathin Ga islands. It is found that both the lateral size and thickness of the Ga islands strongly suppress the superconductivity. Due to substantial surface energy contribution, the transition temperature Tc scales inversely with the island thickness and the minimum thickness for the occurrence of superconductivity is calculated to be two monolayers.

关键词： γ-Ga superconductivity size effects molecular beam epitaxy

Intermetallic interphases in lithium metal and lithium ion batteries

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InfoMat 2021年第10期3卷 1083-1109页

作者： ke Sun Zhangquan peng Laboratory of Advanced Spectro-electrochemistry and Li-ion Batteries Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina School of Applied Physics and Materials Wuyi UniversityJiangmenChina Tianmu Lake Institute of Advanced Energy Storage Technologies Co.Ltd. LiyangChina

A robust electrode-electrolyte interface is the cornerstone for every battery system,as demonstrated in the meandering history of the development of Li-ion batteries(LIBs).In the thrust to replace the graphite anode with more energetic ones in LIBs,the effectual strategy for stabilizing the original graphite-electrolyte interface becomes obsolete and a new anode-electrolyte interface needs ***,this interface has become the Achilles'heel for those anodes,such as Li-metal anode(LMA)and Si-based anode owing to their excessive reductivity,enormous volume change,and so ***,in the last decade,impressive progress has been made on taming these extremely unstable interfaces and on the solid-state batteries(SSBs)that are reported to be less susceptible to parasitic *** of the distinguished strategies is the application of artificial Li-alloying intermetallic interphases onto the surface of LMA,via the direct introduction of foreign metals to the Li anode or indirect hetero-cations doping in the electrolyte,to regulate the Li deposition/stripping behavior,which has markedly improved the stability of the LMA-electrolyte *** parallel,the intermetallic interphases are also witnessed to profoundly enhance the anode-solid electrolyte contact and the corresponding charge transfer kinetics in various *** review will provide a panoramic overview of the application of the intermetallic interphases at the anode-electrolyte interfaces in the lithium metal batteries(LMBs),SSBs,and also derivative works in the conventional LIBs,which will focus on different concepts,methodologies,and understandings from the encircled studies.

关键词： anode-electrolyte interface intermetallic interphase Li-alloying interphase lithiophilic interphase lithium metal anode

Effects of time-varying liquid bridge forces on rheological properties,and resulting extrudability and constructability of three-dimensional printing mortar

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Frontiers of Structural and Civil Engineering 2023年第9期17卷 1295-1309页

作者： peng zhi Yu-Ching WU Timon RABCZUK Department of Structural Engineering Tongji UniversityShanghai 200092China Institute of Structural Mechanics Bauhaus University of WeimarWeimar 99423Germany

Extrudability and constructability are two important,yet contradictory issues pertaining to the construction of three-dimensional(3D)printing *** is easily achieved when 3D printing cement mortar has a high water content and low cohesion,but the printed structure is easily ***,a 3D printing cement mortar with a low water content and high cohesion has a relatively stable printed structure although the cement mortar might not be *** study proposes a particle-based method to simulate 3D printing mortar extrusion and construction as an overall planning tool for building ***,a discrete element model with time-varying liquid bridge forces is developed to investigate the microscopic effects of these forces on global rheological ***,a series of numerical simulations relevant to 3D printable mortar extrudability and constructability are carried *** study demonstrates that the effects of time-varying liquid bridge forces on rheological properties and the resulting extrudability and constructability of 3D printing mortar are ***,an optimized region that satisfies both the extrusion and construction requirements is provided for 3D printing industry as a reference.

关键词： particle-based simulation liquid bridge force rheological property 3D printing mortar extrudability constructability