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Moduli of Polarized Calabi–Yau Pairs

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Acta Mathematica Sinica,English Series 2020年第6期36卷 631-637页

作者： jános KOLLár Chen Yang XU Princeton University Princeton NJ 08544-1000USA MIT CambridgeMA 02139-4307USA

We prove that the irreducible components of the moduli space of polarized Calabi–Yau pairs are projective.

关键词： Polarized Calabi–Yau stable pairs Moduli spaces

A novel approach to determine residual stress field during FSW of AZ91 Mg alloy using combined smoothed particle hydrodynamics/neuro-fuzzy computations and ultrasonic testing

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journal of Magnesium and Alloys 2021年第4期9卷 1311-1335页

作者： A.r.Eivani H.Vafaeenezhad H.r.jafarian j.Zhou School of metallurgy and materials engineering iran university of science and technology^nartnaktehraniran department of biomechanical engineering delft university of technologymekehveg 22628 cd delftthe netherlands

The faults in welding design and process every so often yield defective parts during friction stir welding(FSW).The development of numerical approaches including the finite element method(FEM)provides a way to draw a process paradigm before any physical *** is not practical to simulate all possible designs to identify the optimal FSW practice due to the inefficiency associated with concurrent modeling of material flow and heat dissipation throughout the *** study intends to develop a computational workflow based on the mesh-free FEM framework named smoothed particle hydrodynamics(SPH)which was integrated with adaptive neuro-fiizzy inference system(ANFIS)to evaluate the residual stress in the FSW *** integrated SPH and ANFIS methodology was established and the well-trained ANIS was then used to predict how the FSW process depends on its *** verify the SPH calculation,an itemized FSW case was performed on AZ91 Mg alloy and the induced residual stress was measured by ultrasonic *** suggested methodology can efficiently predict the residual stress distribution throughout friction stir welding of AZ91 alloy.

关键词： Friction stir welding(FSW) Smoothed particle hydrodynamics(SPH) Adaptive neuro-fuzzy inference system(ANFIS) Ultrasonic residual stress

Numerical Simulation of Interaction Between Laminar Flow and Elastic Sheet

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Transactions of Tianjin University 2012年第2期18卷 85-89页

作者：许栋 Munjiza A Williams j j r School of Engineering and Material Science Queen Mary University of London Tianjin Key Laboratory of Harbour and Ocean Engineering Tianjin University

A numerical simulation of the interaction between laminar flow with low reynolds number and a highly flexible elastic sheet is presented. The mathematical model for the simulation includes a three-dimensional finitevolume based fluid solver for incompressible viscous flow and a combined finite-discrete element method for the three-dimensional deformation of solid. An immersed boundary method is used to couple the simulation of fluid and solid. It is implemented through a set of immersed boundary points scattered on the solid surface. These points provide a deformable solid wall boundary for the fluid by adding body force to Navier-Stokes equations. The force from the fluid is also obtained for each point and then applied on the boundary nodes of the solid. The vortex-induced vibration of the highly flexible elastic sheet is simulated with the established mathematical model. The simulated results for both swing pattern and oscillation frequency of the elastic sheet in low reynolds number flow agree well with experimental data.

关键词： fluid-structure interaction (FSI) numerical simulation immersed boundary method combined finite-discrete element method three-dimensional flow

Dexamethasone in coronavirus disease 2019 care:Dosage and utilization insights

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World journal of Virology 2025年第1期14卷 1-4页

作者： Laiba Shamim Imshaal Musharaf Abdulqadir j Nashwan Department of Clinical Medicine Jinnah Sindh Medical UniversityKarachi 75510SindhPakistan Department of Medicine Jinnah Sindh Medical UniversityKarachi 75510SindhPakistan Department of Nursing and Midwifery research Hamad Medical CorporationDoha 3050Qatar

Coronavirus disease 2019(COVID-19)is a contagious disease caused by severe acute respiratory syndrome coronavirus *** was declared a global pandemic on March 11,2020,by the World Health *** excessive inflammatory response is a severe respiratory manifestation of COVID-19,which becomes predominant in later *** to its immunosuppressive and anti-inflammatory properties,dexamethasone is the first systemic glucocorticoid to treat severe COVID-19 *** editorial reviews the efficacy and safety of highdose vs low-dose dexamethasone in patients with *** indicate that using low-dose dexamethasone is beneficial and emphasize the need for additional research on the use of high-dose *** the study provides a robust evidence base,it is limited by the lack of long-term data,focus on specific outcomes and heterogeneity of the included *** research should focus on the long-term effects of dexamethasone and its impact across varying disease severities and patient populations to refine treatment strategies and improve patient care.

关键词： COVID-19 Severe acute respiratory syndrome Corticosteroid Dexamethasone Anti-inflammatory

Treating amyotrophic lateral sclerosis with allogeneic Schwann cell-derived exosomal vesicles: a case report

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Neural regeneration research 2025年第4期20卷 1207-1216页

作者： Pascal j.Goldschmidt-Clermont Aisha Khan George jimsheleishvili Patricia Graham Adriana Brooks risset Silvera Alexander j.P.Goldschmidt Damien D.Pearse W.Dalton Dietrich Allan D.Levi james D.Guest Miller School of Medicine University of MiamiMiamiFLUSA Stem Cell Institute Miller School of MedicineUniversity of MiamiMiamiFLUSA The Miami Project to Cure Paralysis Miller School of MedicineUniversity of MiamiMiamiFLUSA Alzady International LLC MiamiFLUSA Neurological Surgery Miller School of MedicineUniversity of MiamiMiamiFLUSA

Schwann cells are essential for the maintenance and function of motor neurons,axonal networks,and the neuromuscular *** amyotrophic lateral sclerosis,where motor neuron function is progressively lost,Schwann cell function may also be ***,important signaling and potential trophic activities of Schwann cell-derived exosomal vesicles have been *** case report describes the treatment of a patient with advanced amyotrophic lateral sclerosis using serial intravenous infusions of allogeneic Schwann cell-derived exosomal vesicles,marking,to our knowledge,the first instance of such *** 81-year-old male patient presented with a 1.5-year history of rapidly progressive amyotrophic lateral *** initial diagnosis,the patient underwent a combination of generic riluzole,sodium phenylbutyrate for the treatment of amyotrophic lateral sclerosis,and *** patient volunteered to participate in an FDA-approved single-patient expanded access treatment and received weekly intravenous infusions of allogeneic Schwann cell-derived exosomal vesicles to potentially restore impaired Schwann cell and motor neuron *** confirmed that cultured Schwann cells obtained from the amyotrophic lateral sclerosis patient via sural nerve biopsy appeared impaired(senescent)and that exposure of the patient’s Schwann cells to allogeneic Schwann cell-derived exosomal vesicles,cultured expanded from a cadaver donor improved their growth capacity in *** a period of observation lasting 10 weeks,during which amyotrophic lateral sclerosis Functional rating Scale-revised and pulmonary function were regularly monitored,the patient received weekly consecutive infusions of 1.54×1012(×2),and then consecutive infusions of 7.5×1012(×6)allogeneic Schwann cell-derived exosomal vesicles diluted in 40 mL of Dulbecco’s phosphate-buffered *** of the infusions were associated with adverse events such as infusion reactions(allergic or otherwise)or

关键词： allogeneic amyotrophic lateral sclerosis exosomes infusion neuromuscular junction Schwann cell

Cross-focusing of two chirped Gaussian laser beams and THz wave generation in plasmas of multi-ion species under a weakly relativistic and ponderomotive regime

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Plasma Science and Technology 2022年第10期24卷 1-11页

作者： M r jAFArI MILANI S rEZAEI M j jAFArI Photonics and Quantum Technologies research School Nuclear Science and Technology Research InstituteTehran 14665-678Iran Plasma and Fusion research School Nuclear Science and Technology Research InstituteTehran 14399-51113Iran

The generation of terahertz(THz)waves via the beating of two high-intensity chirped Gaussian lasers in a multi-ion-species plasma is numerically studied by taking into account the weak relativistic and ponderomotive regime of *** coupled differential equations for beamwidth parameters are extracted by introducing the dielectric function of such plasma and using WKB and paraxial ray *** amplitude of THz radiation at beat frequency resulting from the nonlinear current density induced by the beat ponderomotive force of the cross-focusing of beams was *** impacts of the chirp frequency parameter,initial laser intensity and initial ionic species density(specifically,the presence of singly and doubly charged ions)in the plasma on THz generation were *** numerical results reveal that THz radiation generation strongly depends on the chirp frequency parameter.A specific range of chirp frequencies exists for self-focusing as well as THz generation with a'turning point',where the THz emission reaches its maximum *** results show that the strength of self-focusing and consequently the generated THz radiation are reduced by increasing the density of doubly charged ionic species in the plasma due to the suppression of the nonlinear effects.

关键词： laser–plasma interaction THz generation chirped Gaussian laser beams

When and how did plate tectonics begin?Theoretical and empirical considerations

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Chinese Science Bulletin 2007年第5期52卷 578-591页

作者： r. j. STErN Geosciences Department University of Texas at Dallas Box 830688 Richardson TX 75083-0688 USA

板 tectonics 在对流传热的披风(岩流圈) 上是地球的热界面层(岩石圈) 的水平运动并且被岩石圈 inking 主要在 subduction 地区驾驶。板 tectonics 是组织的自我的一个突出的例子，远离平衡建筑群系统(SOFFECS ) ，由热界面层的否定快... 详细信息

板 tectonics 在对流传热的披风(岩流圈) 上是地球的热界面层(岩石圈) 的水平运动并且被岩石圈 inking 主要在 subduction 地区驾驶。板 tectonics 是组织的自我的一个突出的例子，远离平衡建筑群系统(SOFFECS ) ，由热界面层的否定快活开车并且由在弯曲岩石圈的驱散控制并且粘滞披风。板 tectonics 是一个不平常的方法让一个硅酸盐行星失去热，当它存在在上仅仅之一大在内部太阳系的五硅酸盐身体。构造活动和热损失的这个模式什么时候开始了，不被知道在地球上。所有硅酸盐行星可能经历了一个短命岩浆海洋阶段。在这团结的、停滞的盖行为是行星的热损失的普通模式以后，与内部，热被融化在更热的早地球中的火山作用和浅 *** 产生了的分层和“热点”正在失去一个不同岩石圈比今天，与更厚的海洋的外壳和更薄的披风岩石圈；如此的岩石圈将比花更长时间目前变得否定地快活，在早地球上建议那板 tectonics 偶发地发生了如果根本。板 tectonics 变得持续(现代风格) 当土足够地冷却了时，融化在散布山脉下面的那解压缩做了薄海洋的外壳，允许海洋的岩石圈在百万年中的一些十个以后变得否定地快活。板 tectonics 什么时候开始了的 Ultimatelythe 问题必须被从地质的记录检索的信息回答。标准因为板 tectonics 的操作包括 ophiolites，蓝片岩 andultra 高的压力变形的带， eclogites，被动边缘，变换差错，不同 cratons 的不同运动的 paleomagneticdemonstration，和在火的岩石中的诊断 geochemicaland 同位素示踪剂的存在。这个记录必须个别地被解释；我解释记录在锝? 从活跃太古代的 tectonics 和类似于板 tectonics 的 magmatismto 一些东西显示构造式样的前进 9 Ga 到有深 subduction 的持续、现代风格板 tectonics—并且强大的平板拉—在 Neoproterozoic 时间开始。

关键词：板块构造形成时间形成机制俯冲前寒武纪地球动力学岩浆作用

Structural and mechanical properties of Al–C–N films deposited at room temperature by plasma focus device

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Chinese Physics B 2016年第7期25卷 299-304页

作者： Z A Umar r Ahmad r S rawat M A Baig j Siddiqui T Hussain National Centre for Physics Quaid-i-Azam University Campus Department of Physics GC University NSSE National Institute of Education Nanyang Technological University Centre for Advanced Studies in Physics GC University

The Al–C–N films are deposited on Si substrates by using a dense plasma focus（DPF） device with aluminum fitted central electrode（anode） and by operating the device with CH_4/N_2 gas admixture ratio of 1：1. XrD results verify the crystalline Al N（111） and Al_3CON（110） phase formation of the films deposited using multiple shots. The elemental compositions as well as chemical states of the deposited Al–C–N films are studied using XPS analysis, which affirm Al–N, C–C, and C–N bonding. The FESEM analysis reveals that the deposited films are composed of nanoparticles and nanoparticle agglomerates. The size of the agglomerates increases at a higher number of focus deposition shots for multiple shot depositions. Nanoindentation results reveal the variation in mechanical properties（nanohardness and elastic modulus）of Al–C–N films deposited with multiple shots. The highest values of nanohardness and elastic modulus are found to be about 11 and 185 GPa, respectively, for the film deposited with 30 focus deposition shots. The mechanical properties of the films deposited using multiple shots are related to the Al content and C–N bonding.

关键词： dense plasma focus XPS field emission scanning electron microscope elastic modulus

Molecular Dynamics Simulation of MgSiO_(3) Perovskite

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Chinese Physics Letters 1998年第6期15卷 444-446页

作者： ZHOU Lin-xiang j.r.Hardy XU Xin Department of Physics Xiamen UniversityXiamen 361005 Department of Physics and Center for Electro-Optics University of Nebraska-LincolnNE 68588-0111U.S.A State Key Laboratory for Physical Chemistry of Solid Surfaces Department of ChemistryXiamen UniversityXiamen 361005

Using molecular dynamics to simulate MgSiO_(3) perovskite is performed to investigate its phase transitions and *** simulations has used parameter-free Gordon-Kim potentials and a novel technique to monitor the motion of ions which clearly demonstrates the sublattice melting of ions O^(2-) and the rotations of SiO_(6) ***_(3) has to undergo a few of phase transitions,then enter into the cubic *** particular,there is a transitional phase between orthorhombic phase and cubic *** are a superionc phase and the cubic phase in magnesium-rich silicate *** superionic phase occurs after the onset of cubic phase before the melting *** onset temperature T_(c) for superionicity is about 200-700K below the melting point T_(m),T_(c)/T_(m)~0.92.

关键词： cubic perovskite transitions