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计算网格与湍流模型对柴油喷雾多维数值模拟结果的影响

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天津大学学报（自然科学与工程技术版） 2004年第11期37卷 965-969页

作者：赵昌普苏万华天津大学内燃机燃烧学国家重点实验室天津300072

为探明柴油喷雾数值模拟的影响因素,用CFD多维数值分析软件研究了柴油喷雾的油束特性.计算结果表明,网格的划分直接影响计算结果的正确性和油束的几何形状.建立计算网格时,要注意网格均匀一致,避免网格密度突变;特殊几何形状壁面附近局... 详细信息

为探明柴油喷雾数值模拟的影响因素,用CFD多维数值分析软件研究了柴油喷雾的油束特性.计算结果表明,网格的划分直接影响计算结果的正确性和油束的几何形状.建立计算网格时,要注意网格均匀一致,避免网格密度突变;特殊几何形状壁面附近局部贴体坐标网格的范围不宜太大,否则会引起计算结果的畸变.对不同湍流模型的计算试验发现,RNGκ ε湍流模型计算精度高、成本低,适合于柴油机缸内喷雾的数值模拟.

关键词：柴油机喷雾特性计算网格湍流模型数值模拟

Aligned Ion Conduction Pathway of Polyrotaxane‑Based Electrolyte with Dispersed Hydrophobic Chains for Solid‑State Lithium–Oxygen Batteries

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Nano-Micro Letters 2025年第2期17卷 169-186页

作者： Bitgaram Kim Myeong‑chang Sung Gwang‑Hee Lee Byoungjoon Hwang Sojung Seo Ji‑Hun Seo Dong‑wan Kim Department of Materials Science and Engineering Korea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea School of Civil Environmental and Architectural EngineeringKorea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea Materials Science and Chemical Engineering Center Institute for Advanced Engineering(IAE)Yongin 17180Republic of Korea

A critical challenge hindering the practical application of lithium–oxygen batteries(LOBs)is the inevitable problems associated with liquid electrolytes,such as evaporation and safety *** study addresses these problems by proposing a modified polyrotaxane(mPR)-based solid polymer electrolyte(SPE)design that simultaneously mitigates solvent-related problems and improves ***-SPE exhibits high ion conductivity(2.8×10^(−3)S cm^(−1)at 25℃)through aligned ion conduction pathways and provides electrode protection ability through hydrophobic chain *** this mPR-SPE into solid-state LOBs resulted in stable potentials over 300 *** situ Raman spectroscopy reveals the presence of an LiO_(2)intermediate alongside Li_(2)O_(2)during oxygen *** situ X-ray diffraction confirm the ability of the SPE to hinder the permeation of oxygen and moisture,as demonstrated by the air permeability *** present study suggests that maintaining a low residual solvent while achieving high ionic conductivity is crucial for restricting the sub-reactions of solid-state LOBs.

关键词： Solid polymer electrolyte Lithium-oxygen batteries Polyrotaxane ion conductivity Hydrophobic chain

Maintaining moderate levels of hypochlorous acid promotes neural stem cell proliferation and differentiation in the recovery phase of stroke

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Neural Regeneration Research 2025年第3期20卷 845-857页

作者： Lin-Yan Huang Yi-De Zhang Jie Chen Hai-Di Fan wan wang Bin wang Ju-Yun Ma Peng-Peng Li Hai-Wei pu Xin-Yian Guo Jian-Gang Shen Su-Hua Qi School of Medical Technology Xuzhou Key Laboratory of Laboratory DiagnosticsXuzhou Medical UniversityXuzhouJiangsu ProvinceChina School of Pharmacy Xuzhou Medical UniversityXuzhouJiangsu ProvinceChina Department of Laboratory Medicine Branch Hospital of Huai’an First People’s HospitalHuai’anJiangsu ProvinceChina Department of Laboratory Medicine the Affiliated Hospital of Xuzhou Medical UniversityXuzhouJiangsu ProvinceChina School of Chinese Medicine The University of Hong KongHong Kong Special Administrative RegionChina

It has been shown clinically that continuous removal of ischemia/reperfusion-induced reactive oxygen species is not conducive to the recovery of late ***,previous studies have shown that excessive increases in hypochlorous acid after stroke can cause severe damage to brain *** previous studies have found that a small amount of hypochlorous acid still exists in the later stage of stroke,but its specific role and mechanism are currently *** simulate stroke in vivo,a middle cerebral artery occlusion rat model was established,with an oxygen-glucose deprivation/reoxygenation model established in vitro to mimic *** found that in the early stage(within 24 hours)of ischemic stroke,neutrophils produced a large amount of hypochlorous acid,while in the recovery phase(10 days after stroke),microglia were activated and produced a small amount of hypochlorous ***,in acute stroke in rats,hypochlorous acid production was prevented using a hypochlorous acid scavenger,taurine,or myeloperoxidase inhibitor,4-aminobenzoic acid *** results showed that high levels of hypochlorous acid(200μM)induced neuronal apoptosis after oxygen/glucose deprivation/***,in the recovery phase of the middle cerebral artery occlusion model,a moderate level of hypochlorous acid promoted the proliferation and differentiation of neural stem cells into neurons and *** suggests that hypochlorous acid plays different roles at different phases of cerebral ischemia/reperfusion *** levels of hypochlorous acid(5 and 100μM)promoted nuclear translocation ofβ-*** transfection of single-site mutation plasmids,we found that hypochlorous acid induced chlorination of theβ-catenin tyrosine 30 residue,which promoted nuclear ***,our study indicates that maintaining low levels of hypochlorous acid plays a key role in the recovery of neurological function.

关键词： cell differentiation cerebral ischemia/reperfusion injury chlorination hypochlorous acid microglia neural stem cell neurogenesis nuclear translocation stroke β-catenin

Precision Motion Control of Hydraulic Actuator Using Adaptive Back-Stepping Sliding Mode Controller

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Computer Modeling in Engineering & Sciences 2024年第11期141卷 1047-1065页

作者： Zhenshuai wan Longwang Yue Yanfeng wang pu Zhao Henan Key Laboratory of Superhard Abrasives and Grinding Equipment Henan University of TechnologyZhengzhou450001China School of Mechanical and Electrical Engineering Henan University of TechnologyZhengzhou450001China

Hydraulic actuators are highly nonlinear when they are subjected to different types of model uncertainties and dynamic *** unfavorable factors adversely affect the control performance of the hydraulic *** various control methods have been employed to improve the tracking precision of the dynamic system,optimizing and adjusting control gain to mitigate the hydraulic actuator model uncertainties remains *** study presents an adaptive back-stepping sliding mode controller(ABSMC)to enhance the trajectory tracking precision,where the virtual control law is constructed to replace the position *** adaptive control theory is introduced in back-stepping controller design to compensate for the model uncertainties and time-varying *** on Lyapunov theory,the finite-time convergence of the position tracking errors is ***,the effectiveness of the developed control scheme is conducted via extensive comparative experiments.

关键词： Hydraulic actuator back-stepping control adaptive control model uncertainties

Synthesis of core-shell structured polymers with inserted thioether from a multi-functional scaffold

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Chinese Chemical Letters 2007年第6期18卷 758-761页

作者： pu, Hong Ting Zhou, Qing wan, De Cheng Tongji Univ Sch Mat Sci & Engn Inst Funct Polymers Shanghai 200092 Peoples R China

The synthesis of a thioether inserted, core-shell structured polymer from the scaffold of hyperbranched polyglycerol (PG) was described. PG was first allyl functionalized, and in the presence of AlBN, the allyl groups further underwent radical addition to thiol compounds, thus thiol functional polyethylene oxide monomether (MPEO) were grafted onto PG. Similarly, 2-mercaptoethylammonium chloride was introduced onto PG via thiol addition, and the residual amino groups were further quaternized with decyl bromide, leading to an amphiphilic core-shell structure polymer. (c) 2007 De Cheng wan. published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： core-shell scaffold thioether radical addition hyperbranched polymer

Some Results on Metric n-Lie Algebras

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Acta Mathematica Sinica,English Series 2012年第6期28卷 1209-1220页

作者： Rui pu BAI wan Qing WU Zhen Heng LI College of Mathematics and Computer Science Hebei University Department of Mathematical Sciences University of South Carolina Aiken

We study the structure of a metric n-Lie algebra G over the complex field C. Let G = S＋R be the Levi decomposition, where T4 is the radical of G and S is a strong semisimple subalgebra of G. Denote by re（G） the number of all minimal ideals of an indecomposable metric n-Lie algebra and R^⊥ the orthogonal complement of R. We obtain the following results. As S-modules, R^⊥ is isomorphic to the dual module of G/R. The dimension of the vector space spanned by all nondegenerate invariant symmetric bilinear forms on G is equal to that of the vector space of certain linear transformations on G; this dimension is greater than or equal to rn（G）＋ 1. The centralizer of T4 in G is equal to the sum of all minimal ideals; it is the direct sum of R^⊥and the center of G. Finally, G has no strong semisimple ideals if and only if R^⊥ R.

关键词： Metric n-Lie algebra minimal ideal metric dimension Levi decomposition

Universal Pseudo-PT-Antisymmetry on One-Dimensional Atomic Optical Lattices

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Communications in Theoretical Physics 2018年第9期69卷 303-310页

作者： Xin wang chang-pu Sun Beijing Computational Science Research Center Beijing 100193China Graduate School China Academy of Engineering PhysicsBeijing 100193China

We present the interesting result that under sinusoidal field detuning setting along the propagation direction of 1D atomic lattices, the probe susceptibility response of the lattices, regardless of atomic configuration, uniformly demonstrates pseudo-PT-antisymmetry, which by our definition corresponds to n(z)=-n*(-z), the complex refractive index antisymmetry along propagation axis, and when being cast back to quantum mechanical side, corresponds to V (x, t)=-V*(x,-t), the conjugate time-reversal antisymmetry of complex potential. We define this as the pseudoPT-antisymmetry, and prove the reason for this phenomenon to be the quantum-mechanical nature described by master equation under weak field approximation for any configuration of 1D atomic lattices. This work will help to deepen the understanding of origin of optical response features of atomic lattices, and will certainly open up the gate to a more rigorous, durable and flexible method of atomic optical lattice design.

关键词： pseudo-PT-antisymmetry conjugate time-reversal antisymmetry zigzag-type atom configuration

Semisolid microstructural evolution of (CNTs+Sip)/AZ91D powder compacts prepared from powders by cold pressing and remelting

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Rare Metals 2020年第6期39卷 733-742页

作者： pu-Bo Li wan-Ting Tan Mang-Mang Gao Kuan-Guan Liu Ningxia Key Laboratory of Photovoltaic Materials Ningxia UniversityYinchuan 750021China

The evolution of semisolid microstructure during partial remelting of(CNTs+Sip)/AZ91 D powder compacts prepared by cold pressing was *** results indicate that rapid grain coarsening is driven by the dissolution of eutecticβphase material during the initial heating period of 0-10 min,so the AZ91 D powders with fine equiaxed grains surrounded by intergranular eutectic phases evolve into compact *** the heating time proceeds,α-Mg particles were gradually separated by liquid due to the phase transformations ofα-Mg+β→L andα-Mg→*** primary particles coarsened rather slowly and the as-received Mg powder evolved into nearly spheroidal particles surrounded by liquid phase after partial *** in situ synthesized Mg2 Sip were distributed homogeneously around the CNTs with maintained structural integrity during partial ***,this microstructural evolution was accompanied by densification through pore *** ideal semisolid ingot suitable for thixoforming can therefore be obtained by partially remelting a(CNTs+Sip)/Mg powder compact.

关键词： Semisolid microstructural evolution Densification Phase transformation Coarsening behavior

Discrete rough set analysis of two different soil-behavior-induced landslides in National Shei-Pa Park,Taiwan

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Geoscience Frontiers 2015年第6期6卷 807-816页

作者： Shih-Hsun chang Shiuan wan Information Networking and System Administration Ling Tung University Information Management Ling Tung University

The governing factors that influence landslide occurrences are complicated by the different soil conditions at various *** resolve the problem,this study focused on spatial information technology to collect data and information on ***,remote sensing and digital elevation model（DEM） were used in combination to extract the attribute values of the surface material in the vast study area of SheiPa National Park,*** factors influencing landslides were collected and quantification values *** major soil component of loam and gravel in the Shei-Pa area resulted in different landslide *** major factors were successfully extracted from the influencing ***,the discrete rough set（DRS） classifier was used as a tool to find the threshold of each attribute contributing to landslide occurrence,based upon the knowledge *** rule-based knowledge database provides an effective and urgent system to manage ***（Normalized Difference Vegetation Index）,VI（Vegetation Index）,elevation,and distance from the road are the four major influencing factors for landslide *** landslide hazard potential diagrams（landslide susceptibility maps） were drawn and a rational accuracy rate of landslide was *** study thus offers a systematic solution to the investigation of landslide disasters.

关键词： Landslide Data mining Discrete rough sets Taiwan