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Research on the influences of motion characteristics of jetting projectile charge under water

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Defence Technology（防务技术） 2024年第3期33卷 411-425页

作者： Xing Chen Yong-gang Lu Institute of Systems Engineering China Academy of Engineering PhysicsMianyang 621900SichuanChina

Shaped charge warhead is important for enhancing the damage performance of underwater *** paper used finite element analysis software and based on JPC water penetration experiments to examine the influence of liner parameters(wall thickness,material),charge aspect ratio,and stand-off distance on the movement characteristics of JPC in *** findings reveal that the head diameter of the JPC increases and experiences significant erosion after entering the water,the effective length of the JPC in water undergoes two distinct phases:a growth phase and a decrease phase,with the velocity of the JPC decaying *** the liner thickness,stand-off distance and the charge aspect ratio can improve the erosion resistance and the velocity retention capacity of the *** optimal ranges for liner thickness and stand-off distance are 0.0363D_(k) to 0.0545D_(k)(D_(k) is the charge diameter),the stand-off distance should be within 1.0D_(k).After the charge aspect ratio higher than 1.25,the charge structure exerts minimal influence the movement characteristics of the JPC in *** density plays a crucial role in the velocity decay pattern of the JPC during *** with higher densities exhibit superior velocity retention capabilities in water,with the velocity decay pattern converging if the densities are ***,copper,tantalum and tungsten liners are deemed appropriate for underwater shaped charge ***,the results will provide an important reference for the design of underwater shaped charge warhead.

关键词： JPC Movement characteristics Underwater penetration Numerical simulation

Long-range asymmetric Cherenkov radiation

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Science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 170-171页

作者： gang Zhong Qingdong Ou Macao Institute of Materials Science and Engineering(MIMSE) Faculty of Innovation EngineeringMacao University of Science and TechnologyTaipaMacao 999078China

Cherenkov radiation(CR)is gaining increasing attention as a high-output power Terahertz radiation source,and it plays a significant role in particle detectors,accelerators,and space science[1].This captivating phenomenon was first observed by Cerenkov in 1934 and was later explained theoretically by Tamm and Frank in 1937,earning them the Nobel Prize in Physics in *** occurs when charged particles move faster than the phase velocity of light in a specific medium.

关键词： asymmetric faster explained

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改性陶瓷膜在含油废水处理中的研究进展

应用化工 2023年第5期52卷 1502-1507页

作者：宗刚郭文靖西安工程大学环境与化学工程学院陕西西安710600

综述了陶瓷膜改性方法,以及在含油废水中的应用,然后对改性陶瓷膜处理含油废水的性能进行了讨论和比较。发现除了传统的溶胶-凝胶法和浸镀方法外,原子层堆积(ALD)在控制层厚和孔径调整方面具有良好的应用前景。纳米级的金属氧化物,如二... 详细信息

综述了陶瓷膜改性方法,以及在含油废水中的应用,然后对改性陶瓷膜处理含油废水的性能进行了讨论和比较。发现除了传统的溶胶-凝胶法和浸镀方法外,原子层堆积(ALD)在控制层厚和孔径调整方面具有良好的应用前景。纳米级的金属氧化物,如二氧化钛、ZrO_(2)、Fe_(2)O_(3)以及氧化石墨烯被认为是含油废水处理中陶瓷膜改性的潜在候选材料。而带电陶瓷膜在污垢控制、拒油和增加水通量方面有一定潜力,但也有其局限性。

关键词：膜改性陶瓷膜含油废水

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三维电极电化学技术及其在废水处理中的应用

应用化工 2023年第12期52卷 3428-3433页

作者：宗刚冯岚婷西安工程大学环境与化学工程学院陕西西安710000

针对三维电催化氧化工艺的应用及进展进行了综述。介绍了三维电催化氧化技术的概念,并且以废水中氨氮污染物的处理探究了该技术的降解机理;简要概括了三维电催化氧化技术的影响因素,如电池电压和电流密度、初始pH、温度等;阐述了三维电... 详细信息

针对三维电催化氧化工艺的应用及进展进行了综述。介绍了三维电催化氧化技术的概念,并且以废水中氨氮污染物的处理探究了该技术的降解机理;简要概括了三维电催化氧化技术的影响因素,如电池电压和电流密度、初始pH、温度等;阐述了三维电催化氧化的典型电极材料,主要是通过构建中间层及涂层多元化改性的DSA电极、改性的掺硼金刚石电极、传统粒子电极和近年来研究热门的负载型粒子电极;分别总结了三维电催化氧化技术在氨氮废水、苯酚废水及印染废水处理方面的应用现状,提出了三维电催化氧化技术目前存在的问题并且对该技术今后的发展方向做出了展望。

关键词：改性DSA电极改性BDD电极粒子电极

Best Paper Award 2022

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Building Simulation 2024年第1期17卷 1-2页

作者： gang Tan College of Civil Engineering and Architecture Zhejiang University HangzhouZhejiang 310058China

I am pleased to announce that the following paper has been awarded the Best Review Paper 2022,which stands out from the 24 review papers published by Building Simulation from 2018(Volume 11)to 2022(Volume 15):Yuejing Zhao&Bin Zhao."Emissions of air pollutants from Chinese cooking:A literature review."Building Simulation,2018,11(5):977-995.

关键词： cooking stands award

Pulses in ground motions identified through surface partial matching and their impact on seismic rocking consequence

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Earthquake Engineering and Engineering Vibration 2024年第1期23卷 35-50页

作者： Tang Yuchuan Wang Jiankang Wu gang School of Civil Engineering Southeast UniversityKey Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of EducationNanjing 211102China National and Local Joint Engineering Research Center for Intelligent Construction and Maintenance Nanjing 211102China

In seismology and earthquake engineering,it is fundamental to identify and characterize the pulse-like features in pulse-type ground *** capture the pulses that dominate structural responses,this study establishes congruence and shift relationships between response spectrum surfaces.A similarity search between spectrum surfaces,supplemented with a similarity search in time series,has been applied to characterize the pulse-like features in pulse-type ground *** identified pulses are tested in predicting the rocking consequences of slender rectangular blocks under the original ground ***,the prediction is promising for the majority of the ground motions where the dominant pulse is correctly identified.

关键词： velocity pulse ground motion surface similarity rocking overturning

2-Independent Domination in Trees

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Journal of the Operations Research Society of China 2024年第2期12卷 485-494页

作者： gang Zhang Baoyindureng Wu College of Mathematics and System Sciences Xinjiang UniversityUrumqi830046XinjiangChina

A subset D■V(G)in a graph G is a dominating set if every vertex in V(G)I D is adjacent to at least one vertex of S.A subset S■V(G)in a graph G is a 2-independent set if△(G[S])<*** 2-independence numberα2(G)is the order of a largest 2-independent set in ***,a subset D■V(G)in a graph G is a 2-independent dominating set if D is both dominating and *** 2-independent domination number i^(2)(G)is the order of a smallest 2-independent dominating set in *** this paper,we characterize all trees T of order n with i^(2)(T)=n/***,we prove that for any tree T of order n≥2,i^(2)(T)≤2/3α2(T),and this bound is sharp.

关键词： Domination-Independent domination 2-Independent domination:2-Independence.Trees

Analysis of a class of globally divergence-free HDG methods for stationary Navier-Stokes equations

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Science China Mathematics 2024年第5期67卷 1133-1158页

作者： gang Chen Xiaoping Xie School of Mathematics Sichuan University Chengdu 610064China

In this paper,we analyze a class of globally divergence-free(and therefore pressure-robust)hybridizable discontinuous Galerkin(HDG)finite element methods for stationary Navier-Stokes *** methods use the P_(k)/P_(k-1)(k≥1)discontinuous finite element combination for the velocity and pressure approximations in the interior of elements,piecewise Pm(m=k,k-1)for the velocity gradient approximation in the interior of elements,and piecewise P_(k)/P_(k) for the trace approximations of the velocity and pressure on the inter-element *** show that the uniqueness condition for the discrete solution is guaranteed by that for the continuous solution together with a sufficiently small mesh *** on the derived discrete HDG Sobolev embedding properties,optimal error estimates are *** experiments are performed to verify the theoretical analysis.

关键词： Navier-Stokes equations HDG methods divergence-free uniqueness condition error estimates

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基于回收意识的废旧衣物回收模式对比分析

系统工程理论与实践 2016年第10期36卷 2583-2589页

作者：宗刚魏素豪北京工业大学经济与管理学院北京100124 北京工业大学循环经济研究院北京100124

针对废旧衣物回收再利用,在对废旧衣物回收模式分析的基础上,基于消费者回收意识建立了企业自主回收模式和第三方回收模式的废旧衣物资源化经济模型,并对二者进行比较分析.结果表明两种模式渠道利润均存在最优解,渠道最优利润的高低取... 详细信息

针对废旧衣物回收再利用,在对废旧衣物回收模式分析的基础上,基于消费者回收意识建立了企业自主回收模式和第三方回收模式的废旧衣物资源化经济模型,并对二者进行比较分析.结果表明两种模式渠道利润均存在最优解,渠道最优利润的高低取决于二者回收量的比较,第三方回收商支付的废旧衣物回收价格和处理商设立回收箱数量决定两种模式的优劣,处理商自主回收模式规模经济效应更为明显,政府扶持下的第三方处理商回收模式存在正的外部性以及寻租利润,导致两种模式的渠道利润比较分界线的移动,制定废旧衣物价值评估准则、提高居民废旧衣物回收再利用意识是推进废旧衣物模式在全国范围内普及的关键.

关键词：回收意识废旧衣物回收模式渠道利润