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Effect of projectile parameters on opening behavior of PELE penetrating RC target

Defence Technology（防务技术） 2021年第3期17卷 859-873页

作者： Li-zhi xu cheng-xin Du Chun cheng Xiao-dong Wang Jiang-bo Wang Zhong-hua Du Guang-fa Gao School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China

When a penetrator with enhanced lateral effect(PELE) impacts on a reinforced concrete(RC) target,the target is damaged with a large *** understanding of how PELE projectile parameters affect the opening dimension,is essential for effective design of the PELE *** this study,under the condition that the impact velocity and target parameters(strength and thickness) were fixed values,the important influence factors of the PELE(jacket wall thickness B,jacket material strength Y1,filling material strength Y2 and angle of monolithic jacket θ) were determined by a dimensional *** and simulations of the PELE penetrating the RC target were conducted to analyze the influence of these factors on opening diameter(D,an equivalent diameter under relative kinetic energy).Based on the test and simulation results,it is found that the influence of these factors B,Y1 and θ on the deformation mode of the jacket shows a similar trend:as values of the three factors decrease,the jacket deforms from small bending deformation to large one,and then to curling *** causes the opening diameter to first increase with the decrease of these three factors,and then *** is well known that the bending resistance of the jacket is related to these factors B,Y1 and θ.Therefore,a plastic limit bending moment(M0) of the jacket was quoted to characterize the influence of these factors on the bending deformation of the jacket and the opening diameter of the *** influence factor Y2 causes D to first increase with the increase of Y2,and then decreases.A formula was developed to predict the opening diameter,whose influence parameters were considered in a dimensionless *** has been shown that the dimensionless opening diameter D/d1 is dependent on two dimensionless parameters■ and■,where d1 and fc are the outer diameter of the projectile and the compressive strength of the target,respectively.

关键词： Penetrator with enhanced lateral effect Opening behaviour Reinforced concrete target Dimensional analysis

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Experimental and numerical investigation on the gas leakage regime for ventilated tail cavity of an underwater vehicle

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Journal of Hydrodynamics 2023年第1期35卷 46-60页

作者： Xiao-bo Quan Shao-hua cheng College of Shipbuilding Engineering Harbin Engineering UniversityHarbin150001China China Academy of Launch Vehicle Technology Beijing100076China Beijing Institute of Astronautical Systems Engineering Beijing100076China

The objective of this paper is mainly to investigate the ventilated tail cavity flow of an underwater vehicle with focus on the gas leakage regime by experimental and numerical methods.A high-speed camera and pressure measurement system are used to record the cavity flow patterns and pressure behavior,*** numerical simulation is carried out with volume of fluid(VOF)model and Filter-based turbulence model(FBM).Good agreement can be obtained between the experimental and numerical *** are three gas leakage types in the evolution of the intact tail cavity,i.e.,twin-vortex tube entrainment(TVTE),toroidal vortex shedding(TVS)and hybrid twin-vortex tube entrainment and toroidal vortex shedding(TVTE-TVS).With the increase of Fr,the unsteady behavior of the cavity with different gas leakage types becomes more *** internal flow characteristics revealed three distinct regions including the ventilation influence region,the reverse flow region and the high shear flow region and have an important effect on the transition of gas leakage regime.

关键词： Ventilated tail cavity gas leakage regime unsteady behavior internal flow characteristics

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Deflagration and detonation induced by shock wave focusing at different Mach numbers

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Chinese Journal of Aeronautics 2024年第2期37卷 249-258页

作者： Zezhong YANG Jun cheng bo ZHANG School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China

Shock wave focusing is an effective way to create a hot spot or a high-pressure and hightemperature region at a certain place,showing its unique usage in detonation initiation,which is beneficial for the development of detonation-based *** flame propagation behavior after the autoignition induced by shock wave focusing is crucial to the formation and self-sustaining of the detonation *** this study,wedge reflectors with two different angles(60°and 90°)and a planar reflector are employed,and the Mach number of incident shock waves ranging from 2.0 to 2.8 is utilized to trigger different flame propagation *** pressure transducers and the high-speed schlieren imaging system are both employed to investigate the shock-shock collision and ignition *** results reveal a total of four flame propagation modes:deflagration,DDT(Deflagration-to-Detonation Transition),unsteady detonation,and direct *** detonation wave formed in the DDT and unsteady detonation mode is only approximately 75%-85%of the Chapman-Jouguet(C-J)speed;meanwhile,the directly induced detonation wave speed is close to the C-J *** waves,which are strong evidence for the existence of detonation waves,are discovered in *** usage of wedge reflectors significantly reduces the initial pressure difference ratio needed for direct detonation *** also provide a practical method for differentiating between detonation and deflagration modes,which involves contrasting the speed of the reflected shock wave with the speed of the theoretically nonreactive reflected shock *** findings should serve as a reference for the detonation initiation technique in advanced detonation propulsion engines.

关键词： Deflagration Detonation Hydrogen Ignition Shock wave focusing

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Improved mass relations of mirror nuclei

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Nuclear Science and Techniques 2024年第9期35卷 178-185页

作者： cheng xu Man Bao Department of Physics University of Shanghai for Science and TechnologyShanghai 200093China

In this study,we revisit the previous mass relations of mirror nuclei by considering 1/N-and 1/Z-dependent terms and the shell effect across a *** root-mean-squared deviation is 66 keV for 116 nuclei with neutron number N≥10,as com-pared with experimental data compiled in the AME2020 *** predicted mass excesses of 173 proton-rich nuclei,including 98 unknown nuclei,are tabulated in the Supplemental Material herein with competitive accuracy.

关键词： Nuclear mass Mirror nuclei Proton-rich nuclei

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First-principles-aided thermodynamic modeling of transition-metal heterogeneous catalysts:A review

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Green Energy & Environment 2020年第3期5卷 286-302页

作者： Haoxiang xu Daojian cheng State Key Laboratory of Organic-Inorganic Composites and Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing100029China

Over the past decade,the first-principles-aided thermodynamic models have become standard theoretical tools in research on structural stability and evolution of transition-metal heterogeneous catalysts under reaction *** in first-principles-aided thermodynamic models mean it is now possible to enable the operando computational modeling,which provides a deep insight into mechanism behind structural stability and evolution,and paves the way for high-through screening for promising transition-metal heterogeneous ***,we briefly review the framework and foundation of first-principles-aided thermodynamic models and highlight its contribution to stability analysis on catalysts and identification of reaction-induced structural evolution of catalyst under reaction *** present review is helpful for understanding the ongoing developments of first-principles-aided thermodynamic models,which can be employed to screen high-stability catalysts and predict their structural reconstruction in future rational catalyst design.

关键词： First-principles calculation Thermodynamic principle Transition metal catalyst Structural stability Structural evolution

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Mechanism of action of Linggui Zhugan Decoction in treating non-alcoholic fatty liver disease using untargeted metabolomics approach

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Traditional Medicine Research 2025年第2期10卷 65-76页

作者： Huan Pei Ren-Lin Li Xin-Ran Song Qian-Qian Wan Yu-Ming Wang Han-Zhou Li Wei-Quan xu Jia-Bao Liao Wei-bo Wen Jing Miao Huan-Tian Cui School of Basic Medicine Yunnan University of Chinese MedicineKunming 650599China School Clinical Medical College Yunnan University of Chinese MedicineKunming 650599China First School of Clinical Medicine Yunnan University of Chinese MedicineKunming 650599China School of Integrative Chinese and Western Medicine Tianjin University of Traditional Chinese MedicineTianjin 301617China Department of Pharmacy Tianjin Second People's HospitalTianjin 300192China

Background:Non-alcoholic fatty liver disease(NAFLD)is a liver disorder characterized by the accumulation and degeneration of fat in the liver cells,a condition that may further deteriorate and lead to cirrhosis and liver *** studies showed that metabolic dysfunction can promote NAFLD *** Zhugan Decoction(LGZGD)has therapeutic effects on *** mechanism of LGZGD still remains *** study was to examine the impact of LGZGD on the metabolic processes involved in the development of ***:A mice model of NAFLD was treated with *** therapeutic potential of LGZGD was evaluated by assessing the activity of transaminases,lipids levels of blood,and pathological changes in the liver of the mice model of ***,this study also evaluated the influence of LGZGD on liver inflammation and oxidative ***:The results of untargeted metabolomics analysis showed that LGZGD reduced the disordered lipid metabolism in NAFLD *** improved the oxidative stress and also reduced the levels of pro-inflammatory cytokines in the *** metabolomics analysis of liver samples revealed that LGZGD treatment improved metabolic disorders,including alanine,aspartate,glutamate,glycerophospholipid metabolism,and citrate *** RT-qPCR and Western blot results showed that LGZGD could regulate the expression of key enzymes in the metabolic pathway of the citrate cycle,including ATP-citrate lyase(ACLY),alanine-glyoxylate aminotransferase-2(AGXT2),phosphatidylethanolamine N-methyltransferase(PEMT),and succinate dehydrogenase(SDH).Conclusion:We found that LGZGD can treat NAFLD by reducing inflammatory responses,inhibiting oxidative stress,regulating alanine,aspartate,glutamate,and glycerophospholipid metabolism,and citrate cycle pathways.

关键词： NAFLD LGZGD untargeted metabolomics glycerophospholipid metabolism citrate cycle

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Intricate evolutions of multiple-period post-buckling patterns in bilayers

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Science China(Physics,Mechanics & Astronomy) 2021年第1期64卷 72-81页

作者： Zhe cheng Fan xu Institute of Mechanics and Computational Engineering Department of Aeronautics and AstronauticsFudan UniversityShanghai200433China

Surface instability of compliant film/substrate bilayers has raised considerable interests due to its broad applications such as wrinkle-driven surface renewal and antifouling,shape-morphing for camouflaging skins,and micro/nano-scale surface patterning ***,it is still a challenge to precisely predict and continuously trace secondary bifurcation transitions in the nonlinear post-buckling ***,we develop lattice models to precisely capture the nonlinear morphology evolution with multiple mode transitions that occur in the film/substrate *** on our models,we reveal an intricate post-buckling phenomenon involving successive flat-wrinkle-doubling-quadrupling-fold ***-stretch and pre-compression of the substrate,as well as bilayer modulus ratio,can alter surface morphology of film/substrate *** high substrate pre-tension,hierarchical wrinkles emerge in the bilayer with a low modulus ratio,while a wrinkle-to-ridge transition occurs with a high modulus ***,with moderate substrate pre-compression,the bilayer eventually evolves into a period-tripling *** diagrams based on neo-Hookean and Arruda-boyce constitutions are drawn to characterize the influences of different factors and to provide an overall view of ultimate pattern *** understanding and quantitative prediction of the nonlinear morphological transitions of soft bilayer materials hold potential for multifunctional surface regulation.

关键词： hierarchical wrinkle period-doubling period-tripling period-quadrupling fold ridge

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Special issue:innovative nuclear energy technology

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Frontiers in Energy 2021年第4期15卷 791-792页

作者： xu cheng Institute of Applied Thermofluidics Karlsruhe Institute of Technology76131 KarlsruheGermany

Nuclear energy plays an important role in the long-term energy *** to World Nuclear Association(WNA),the nuclear power installation in China will approximate 400 GWe by *** achieve high performance of the future nuclear reactors with respect to safety,sustainability,and economy,extensive research activities are ongoing worldwide to develop advanced nuclear energy systems and related ***,it is important to match the needs in countries where there are high expectations for nuclear technology and in countries where rich expertise and research findings exist.

关键词： energy approximate finding

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Surface functionalization on the thermal conductivity of graphene-polymer nanocomposites

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International Journal of Smart and Nano Materials 2014年第2期5卷 123-132页

作者： Mingchao Wang Dilini Galpaya Zheng bo Lai Yanan xu cheng Yan School of Chemistry Physics and Mechanical EngineeringQueensland University of TechnologyBrisbaneQLD 4001Australia

Exploring thermal transport in graphene-polymer nanocomposite is significant to its applications with better thermal *** thermal conductance between graphene and polymer matrix plays a critical role in the improvement of thermal conductivity of graphene-polymer ***,it is still challenging to understand the interfacial thermal transport between graphene nanofiller and polymer matrix at small material length *** this end,using nonequilibrium molecular dynamics(NEMD)simulations,we investigate the interfacial thermal conductance of graphene-polyethylene(PE)*** influence of functionalization with hydrocarbon chains on the interfacial thermal conductance of graphene-polymer nanocomposites was studied,taking into account the effects of model size and thermal conductivity of *** analytical model is also used to calculate the thermal conductivity of *** results are considered to contribute to the development of new graphene-polymer nanocomposites with tailored thermal properties.

关键词： graphene functionalization nanocomposite interface thermal transport

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广域确定性网络传输技术综述

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软件学报 2025年第1期36卷 371-398页

作者：李彤徐都玲吴波郭雄文蒋岱均罗成卢卫杜小勇数据工程与知识工程教育部重点实验室(中国人民大学) 中国人民大学信息学院腾讯科技有限公司

广域网作为连接新业务、新基础设施和各类新型应用的纽带,已成为21世纪最重要的基础设施之一.近年来,数据量爆炸性增长,伴随着基于广域网的大模型、数字经济、元宇宙和全息社会等新型应用形态的持续涌现,以及东数西算、算力网络和数据... 详细信息

广域网作为连接新业务、新基础设施和各类新型应用的纽带,已成为21世纪最重要的基础设施之一.近年来,数据量爆炸性增长,伴随着基于广域网的大模型、数字经济、元宇宙和全息社会等新型应用形态的持续涌现,以及东数西算、算力网络和数据场等新型业务架构的出现,业务对广域网的数据传输服务质量提出了越来越高的要求.以时延为例,广域网不仅需要提供及时的服务,还需要提供准时的服务,即时延成为必须满足的确定性指标.因此,广域确定性网络作为广域网的新范式应运而生.系统地综述确定性网络的内涵,回顾传统确定性网络相关技术发展脉络,介绍广域确定性网络的新应用,探讨广域网确定性网络传输具有的新特征以及面临的新挑战,并提出广域确定性网络的新目标.基于上述新应用、新特征、新挑战和新目标,详细总结当前广域确定性网络领域的主要研究进展,并给出未来研究的方向.期望能为广域确定性网络领域的研究提供参考和帮助.

关键词：广域网确定性网络数据传输改良式革命式

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