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A comparative study for the impact performance of shaped charge JET on UHPC targets

Defence Technology（防务技术） 2019年第4期15卷 506-518页

作者： Hao Wu feng Hu qin Fang Research Institute of Structural Engineering and Disaster Reduction College of Civil Engineering Tongji University Shanghai 200092 China Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education Tongji University Shanghai 200092 China Research Institute for National Defense Engineering of Academy of Military Sciences PLA Beijing 100091 China Amy Engineering University of PLA Nanjing 210007 China

With the development of two-stage munitions(a precursor shaped charge(SC)and a following kinetic energy projectile)to attack the hard concrete targets,as well as the increasing applications of ultra-high performance concrete(UHPC)in both civil and military protective structures,a comparative study on the impact performance of SC formed jet on UHPC target is performed experimentally and numerically at ***,a series of jet penetration/perforation test on the UHPC,45# steel and UHPC/45# steel composite targets are *** assessing the penetration depth and borehole(crater and tunnel)diameter,the influences of target material and configuration as well as the standoff distance of SC on the impact performance of jet are experimentally ***,by adopting the 2 D multi-material Arbitrary Lagrange-Euler(ALE)algorithm,Fluid-Structure Interaction(FSI)method and erosion algorithm implemented in the finite element code LS-DYNA,the formation and impact performance of jet in the present test are well ***,based on the validated numerical algorithms,constitutive models and the corresponding parameters,the influences of target material(UHPC,NSC and 45# steel),standoff distance,target configuration(stacked and spaced)and weight efficiency on the impact performance of jet are further *** derived conclusions could provide helpful references for evaluating the ballistic performance of jet and designing the protective structures.

关键词： Shaped charge jet Ultra-high performance concrete Penetration Perforation Numerical simulation

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老年人血清胆红素水平与冠状动脉病变程度的关系

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中国动脉硬化杂志 2007年第4期15卷 311-312页

作者：冯国勤杨进王新宝孟春林灵丹吴汉利潍坊医学院附属医院心内科山东省潍坊市261031

目的观察老年人血清胆红素与冠状动脉病变的关系。方法经冠状动脉造影确诊的冠心病患者80例,其中冠状动脉轻度狭窄组15例,中度狭窄组32例,重度狭窄组33例;另外选取冠状动脉造影正常者40例做对照。采用重氮苯磺酸法测定血清胆红素水平,... 详细信息

目的观察老年人血清胆红素与冠状动脉病变的关系。方法经冠状动脉造影确诊的冠心病患者80例,其中冠状动脉轻度狭窄组15例,中度狭窄组32例,重度狭窄组33例;另外选取冠状动脉造影正常者40例做对照。采用重氮苯磺酸法测定血清胆红素水平,并对胆红素与各因素进行直线相关分析。结果冠心病组血清胆红素水平明显低于正常对照组,血清胆红素水平与冠状动脉病变程度成显著负相关关系(r=-0.26,P<0.05)。结论冠心病患者血清胆红素水平较正常人明显降低。低血清胆红素可能是冠心病的一种危险因素。血清胆红素水平与冠状动脉狭窄程度有明显相关性。

关键词：内科学血清胆红素冠状动脉狭窄老年人动脉粥样硬化

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中医外科学课程教学融入思政教育的思考

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中国中医药现代远程教育 2025年第1期23卷 23-26页

作者：覃锋张力刘明广西中医药大学第一附属医院教学部广西南宁530023 广西中医药大学第一附属医院创面修复科广西南宁530023

“思政课程”到“课程思政”是一种新思想政治教育教学模式的改革过程,主要强调挖掘各专业课中的思政元素和思政资源,要求全体教师树立思政教育意识。中医外科学是中医学专业的重要临床课程。在其教学中落实课程思政,以专业知识为载体,... 详细信息

“思政课程”到“课程思政”是一种新思想政治教育教学模式的改革过程,主要强调挖掘各专业课中的思政元素和思政资源,要求全体教师树立思政教育意识。中医外科学是中医学专业的重要临床课程。在其教学中落实课程思政,以专业知识为载体,融入体现专业特色的思政元素,可为课堂注入思想的活力与灵魂,强化医学生的品德素养,实现中医外科学课程教学与思政课教学同向同行。

关键词：课程思政中医外科学中医教育

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Azobenzene/graphene hybrid for high-density solar thermal storage by optimizing molecular structure

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Science China(Technological Sciences) 2016年第9期59卷 1383-1390页

作者： LI Man[[ feng YiYu[[ LIU EnZuo qin ChengQun[[ feng Wei[[ School of Materials Science and Engineering Tianjin University Tianjin 300072 China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072 China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Education Tianjin 300072 China Tianjin Key Laboratory of Composite and Functional Materials Tianjin 300072 China

A large capacity storing solar energy as latent heat in a close-cycle is essentially important for solar thermal fuels. This paper presents a solar thermal molecule model of a photo-isomerizable azobenzene(Azo) molecule covalently bound to graphene. The storage capacity of the Azo depending on isomerization enthalpy(ΔH) is calculated based on density functional theory. The result indicates that the ΔH of Azo molecules on the graphene can be tuned by electronic interaction, steric hindrance and molecular hydrogen bonds(H-bonds). Azo with the withdrawing group on the ortho-position of the free benzene shows a relatively high ΔH due to resonance effect. Moreover, the H-bonds on the trans-isomer largely increase ΔH because they stabilize the trans-isomer at a low energy. 2-hydroxy-4-carboxyl-2′,6′,-dimethylamino-Azo/graphene shows the maximum ΔH up to 1.871 e V(107.14 Wh kg^(-1)), which is 125.4% higher than Azo without functional groups. The Azo/graphene model can be used for developing high-density solar thermal storage materials by controlling molecular interaction.

关键词： solar thermal energy storage azobenzene graphene hydrogen bonds density functional theory

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Flexible and elastic thermal regulator for multimode intelligent temperature control

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SusMat 2023年第6期3卷 843-858页

作者： Can Chen Huitao Yu Tao Lai Jun guo Mengmeng qin Zhiguo Qu Yiyu feng Wei feng Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjinP.R.China MOE Key Laboratory of Thermo-Fluid Science and Engineering School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’anP.R.China

As nonlinear thermal devices,thermal regulators can intelligently respond to temperature and control heat flow through changes in heat transfer capacities,which allows them to reduce energy consumption without external ***,current thermal regulators generally based on high-quality crystallinestructure transitions are intrinsically rigid,which may cause structural damage and functional failure under mechanical strain;moreover,they are difficult to integrate into emerging soft electronic *** this study,we develop a flexible,elastic thermal regulator based on the reversible thermally induced deformation of a liquid crystal elastomer/liquid metal(LCE/LM)composite *** adjusting the crosslinking densities,the LCE foam exhibits a high actuation strain of 121%with flexibility below the nematic–isotropic phase transition temperature(TNI)and hyperelasticity above *** incorporation of LMresults in a high thermal resistance switching ratio of 3.8 over a wide working temperature window of 60◦C with good cycling *** feature originates from the synergistic effect of fragmentation and recombination of the internal LM network and lengthening and shortening of the bond line ***,we fabricate a“grid window”utilizing photic-thermal integrated thermal control,achieving a superior heat supply of 13.7℃ at a light intensity of 180mW/cm^(2)and a thermal protection of 43.4℃at 1200 mW/cm^(2).The proposed method meets the mechanical softness requirements of thermal regulatormaterials with multimode intelligent temperature control.

关键词： intelligent temperature control liquid crystal elastomer liquid metal thermal regulator thermomechanical coupling

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Instability in Two-Sided Thermocapillary-Buoyancy Convection with Interfacial

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Chinese Physics Letters 2020年第1期37卷 19-23页

作者： guo-feng Xu Qiu-Sheng Liu Jun qin Zhi-Qiang Zhu Institute of Mechanics Chinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100049

A new model of two-phase thermocapillary-buoyancy convection with phase change at gas-liquid interface in an enclosed cavity subjected to a horizontal temperature gradient is proposed,rather than the previous onesided model without phase *** study the onset of multicellular convection and two inodes of convective instability,and find four different flow *** transition map is compared with the non-phase-change *** numerical results show the stabilizing effect of interfacial phase change on the thermocapillarybuoyancy convection.

关键词： capillary thermocapillary phase

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Coherent Control of the Hartman Effect through a Photonic Crystal with Four-Level Defect Layer

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Communications in Theoretical Physics 2018年第11期69卷 613-618页

作者： feng-Lian Hu Fazal Badshah Abdul Basit Hai-Yang Zhang qing He guo-qin Ge School of Physics Huazhong University of Science and Technology Quantum Optics Lab.Department of Physics COMSATS Institute of Information Technolgy College of Science Zhongyuan University of Technology

In this paper, we examine the transmission of a probe field through a one dimensional photonic crystal (1DPC) when the sixth layer of the crystal is doped with four level atoms. We analyze effects of the external driving field on the passage of weak probe field across the photonic crystal. It is found that for the phase time delay of the probe photons, intensity of the driving field switches the Hartman effect from sub to superluminal character. It is interesting to note that in our model, the superluminal transmission of the probe pulse is accompanied by a negligibly small absorption of the incident beam. It ensures that the probe field does not attenuate while passing through the photonic crystal. A similar switching of the Hartman effect may be obtained by adjusting detuning of the probe field related to the excited states of the four-level doping atoms.

关键词： phase time delay photonic crystal Hartmann effect superclassicality

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Elevating photoluminescence properties of Y_(3)MgAl_(3)SiO_(12):Ce^(3+)transparent ceramics for high-power white lighting

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Journal of Rare Earths 2023年第5期41卷 649-657,I0001页

作者： Shaowei feng Yongchang guo Xiaoming Sun Jie Fu Jianqiang Li Jun Jiang Haiming qin Hui Wang Yafeng Yang Institute of Process Engineering Chinese Academy of SciencesBejing 100190China University of Chinese Academy of Sciences Bejing 100049China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China

Compared with Y_(3)Al_(5)O_(12):Ce^(3+),Y3MgAl3SiO12:Ce^(3+)(YMASG:Ce^(3+))reveals great potential for highpower white lighting with red-shift ***,YMASG:Ce^(3+)transparent ceramics were explored to be synthesized in the air following hot isostatic pressure(HIP)treatment to obtain tunable and optimized optical *** phase purity,microstructure,transmittance,and photoluminescence of YMASG:Ce^(3+)ceramics were *** emission peak of YMASG:Ce^(3+)transparent ceramic can be tuned from 573 to 592 nm with the variation of Ce^(3+)doping *** should be noted that this YMASG:0.2 at%Ce^(3+)transparent ceramic with emission peak at 579 nm under 450 nm excitation exhibits the highest internal/external quantum efficiency(72%/65%).The white LED device using YMASG:0.2 at%Ce^(3+)transparent ceramic with a 0.4 mm thickness demonstrates a luminous efficiency(LE)of 106 lm/W,correlated color temperature of 3158 K,and color coordinate(0.3933,0.3265).Thermal stability can be significantly imporoved by the incorporation of Lu^(3+)in YMASG transparent ceramic,and the Y3-yLuyMgAl3SiO12:0.2 at/Ce^(3+)(y=0-2.5)transparent ceramics were *** highest thermal stability(88%@150℃of the integrated emission intensity at 25℃)can be achieved wheny=*** maximum LE of 154 Im/W can be obtained from Y_(0.5)Lu_(2.5)MgAl_(3)SiO_(12):0.2 at%Ce^(3+)transparent *** results indicate that YMASG:Ce^(3+)transparent ceramics with optimized properties can be regarded as an encouraging candidate for highpower white lighting.

关键词： Y_(3)Al_(5)O_(12):Ce^(3+) Transparent ceramics Photoluminesce nceproperties High-power white lighting Microstructure Rare earths

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CH_(3)I sensing using yttrium single atom-doped perovskite nanocrystals

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Nano Research 2023年第7期16卷 10429-10435页

作者： Xiaowei feng Yuanlong qin Rui Sui guo Wang Xinyu Zhang Xinyu Liu Jiajing Pei Di Liu Zhengbo Chen Department of Chemistry Capital Normal UniversityBeijing 100048China Department of Chemistry Tsinghua UniversityBeijing 100084China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of ScienceBeijing 100029China

Nanocrystals(NCs)of cesium lead halide perovskites are optically unstable,which prevents their use in optical *** combination of perovskite NCs and metal single atoms(SAs)may be a good solution to this ***,depositing metal SAs on perovskite NCs remains a challenge due to relative weak metal-halide ***,we present that,via a photo assisted method using cesium lead halide perovskite NCs as host material to anchor Y single atoms,we successfully synthesize Y SA anchored CsPbBr_(3)NCs(Y-SA/CsPbBr_(3)NCs)with outstanding fluorescence stability through the formation of two Y-O bonds and two Y-Br *** comparison to bare CsPbBr_(3)NCs,Y-SA/CsPbBr_(3)NCs possess more stable optical *** as-synthesized Y-SA/CsPbBr_(3)NCs can be employed as a colorimetric platform to perform rapid CH_(3)I *** limit of 0.044 ppm is exhibited in this approach with excellent anti-interference *** YSA/CsPbBr_(3)NCs-based system has been applied to the detection of CH_(3)I in sweet potato samples with satisfying results.

关键词： cesium lead halide perovskites Y single atoms fluorescence stability CH_(3)I sensing

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The Relationship between the Nonexistence of Generalized Bent Functions and Diophantine Equations

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Acta Mathematica Sinica,English Series 2011年第6期27卷 1173-1186页

作者： feng Mei LIU qin YUE National Key Laboratory on Information Assurance Technology Sub-box 21 Box 7227 Beijing 100072 P. R. China Department of Mathematics Nanjing University of Aeronautics and Astronautics Nanjing 210016 P. R. China

Two new results on the nonexistence of generalized bent functions are presented by using properties of the decomposition law of primes in cyclotomic fields and properties of solutions of some Diophantine equations, an... 详细信息

关键词： Generalized bent function integral basis Diophantine equation

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