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Three-point bending of honeycomb sandwich beams with facesheet perforations

Acta Mechanica Sinica 2018年第4期34卷 667-675页

作者： Pengbo Su Bin Han Zhongnan zhao Qiancheng Zhang Tian jian lu State Key Laboratory for Strength and Vibration of Mechanical Structures Xi'an Jiaotong University MOE Key Laboratory for Multifunctional Materials and Structures Xi'an Jiaotong University School of Mechanical Engineering Xi'an Jiaotong University

A novel square honeycomb-cored sandwich beam with perforated bottom facesheet is investigated under threepoint bending,both analytically and *** square holes in the bottom facesheet are characterized by the area ratio of the hole to intact facesheet（perforation ratio）.While for large-scale engineering applications like the decks of cargo vehicles and transportation ships,the perforations are needed to facilitate the fabrication process（e.g.,laser welding）as well as service maintenance,it is demonstrated that these perforations,when properly designed,can also enhance the resistance of the sandwich to *** illustration,fair comparisons among competing sandwich designs having different perforation ratios but equal mass is achieved by systematically thickening the core ***,the perforated sandwich beam is designed with a relatively thick facesheet to avoid local indention failure so that it mainly fails in two competing modes：（1）bending failure,i.e.,yielding of beam cross-section and buckling of top facesheet caused by bending moment;（2）shear failure,i.e.,yielding and buckling of core webs due to shear *** sensitivity of the failure loads to the ratio of core height to beam span is also discussed for varying perforation *** the perfo-ration ratio is increased,the load of shear failure increases due to thickening core webs,while that of bending failure decreases due to the weakening bottom *** of a sandwich beam with optimal perforation ratio is realized when the two failure loads are equal,leading to significantly enhanced failure load（up to 60%increase）relative to that of a non-perforated sandwich beam with equal mass.

关键词： Honeycomb sandwich Facesheet perforation Three-point bending Analytical model

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Ab initio Study of Anharmonic Force Field and Spectroscopic Constants for Germanium Dichloride

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Chinese Journal of Chemical Physics 2016年第6期29卷 657-662,I0001页

作者： Wei-xiu Pang Yun-bin Sun jian-jun zhao Yi lu KeyLaboratoryofMagnetismandMaEneticMaterialsatUniversitiesofInnerMongoliaAutonomousRegion DepartmentofPhysicsBaotouNormalUniversityBaotou014030China

Ab initio study of the equilibrium structure, spectroscopy constants, and anharmonic force field for several isotopomers of germanium dichloride （70GeCl2, 72GECl2, and 76GeCl2） have been carried out at the MP2 and CCSD（T） levels of theory using cc-pVTZ basis set. The cal- culated geometries, rotational constants, vibration-rotation interaction constants, harmonic frequencies, anharmonic constants, quartic and sextic centrifugal distortion constants, cubic and quartic force constants are compared with experimental data. For small mass differences of the Ge isotopes, the isotopic effects for germanium dichloride are much weaker. The agreements are satisfactory for these two methods, but the deviations of CCSD（T） results are slightly larger than that of MP2, because of CCSD（T）＇s inadequate treatment of electron correlation in hypervalent Cl atom.

关键词： Anharmonic force field Spectroscopic constants Germanium dichloride

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Effect of Curcumol on NOD-Like Receptor Thermoprotein Domain 3 Inflammasomes in Liver Fibrosis of Mice

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Chinese Journal of Integrative Medicine 2022年第11期28卷 992-999页

作者： ZHENG Yang WANG Lei WANG Jia-hui LIU lu-lu zhao Tie-jian Department of Medicine Faculty of Chinese Medicine ScienceGuangxi University of Chinese MedicineNanning(530021)China Department of Teaching the First Affiliated Hospital of Guangxi University of Chinese MedicineNanning(530022)China Department of Physiology College of Basic MedicineGuangxi University of Chinese MedicineNanning(530021)China

Objective:To investigate the effect of curcumol on NOD-like receptor thermoprotein domain 3(NLRP3)inflammasomes,and analyze the mechanism underlying curcumol against liver ***:Thirty Kunming mice were divided into a control group,a model group and a curcumol group according to a random number table,10 mice in each *** were intraperitoneally injected with 40% carbon tetrachloride(CCl4:peanut oil,2:3 preparation)at 5 m L/kg for 6 weeks,twice a week,for developing a liver fibrosis *** mice in the control group were given the same amount of peanut oil,twice a week for 6 *** mice in the curcumol group were given curcumol(30 m L/kg)intragastrically,and the mice in the model and control groups were given the same amount of normal saline,once a day for 6 *** in liver structure were observed by hematoxylin and eosin(HE)and Masson *** function,liver fiber indices,and the expression of interleukin(IL)-10 and tumor necrosis factor-α(TNF-α)levels were determined by automatic biochemical analyzer and enzyme linked immunosorbent assay *** and reverse transcription-quantitative PCR(RT-qPCR)were performed to detect the expression of NLRP3 inflammasome-related molecules,TGF-β and ***:HE and Masson staining results showed that the hepatocytes of the model group were arranged irregularly with pseudo-lobular structure and a large amount of collagen *** mice in the curcumol group had a significant decrease in liver function and liver fibers indices compared with the model group(Plusion:A potential anti-liver fib

关键词： curcumol NOD-like receptor thermoprotein domain 3 inflammatory body liver fibrosis

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Effect of Stokes number on energy modulation of the fluid in turbulent particle-laden channel flows

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Journal of Hydrodynamics 2022年第3期34卷 510-521页

作者： Zhi-feng Wu jian-zhao Wu Bo-fu Wang Zhi-ming lu Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering ScienceShanghai Key Laboratory of Mechanics in Energy EngineeringShanghai UniversityShanghai200072China

The effect of Stokes number on the kinetic energy(KE)budget in particle-laden turbulent channel flows is examined by conducting two-way coupled direct numerical simulations using the Eulerian-Lagrangian *** friction Reynolds number of the single phase channel flow is Re_(τ)=180,the particle mass loading and volume fraction areφ_(m)=0.2,φ_(v)≈10−4,and the Stokes numbers range from St^(+)=14–*** statistics show that due to the presence of solid particles,the mean velocity is reduced in the vicinity of the wall but enhanced in the outer region,and the off-streamwise intensity of fluctuated velocity and the Reynolds stress are reduced in the whole *** analysis on the budgets of turbulent kinetic energy(TKE)finds that the presence of particles induces a significant reduction on both the production and dissipation *** increasing Stokes number St^(+),both the production and dissipation rates exhibit non-monotonical trends,i.e.,both initially decrease for St^(+)*** suggests that the particle-induced suppression on TKE production and dissipation is the strongest nearly at St^(+)=*** is also found that particles act as an additional sink/source term in the budgets of both mean-flow kinetic energy(MKE)and *** addition,we investigate the influence of St^(+)on the“zero point”which indicates the balance of exchanging energy between the particle and fluid *** is shown that with increasing St^(+),the“zero point”moves toward the wall,suggesting that the position of perfect following between particle and fluid is closer to the wall with larger St^(+).The present results reveal the Stokes number effects on the spatial transport mechanisms of MKE,TKE in turbulent channel flows laden with inertial particles.

关键词： Particle-laden flows two-way coupling Stokes numbers kinetic energy budgets

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HPLC法测定2型糖尿病患者血清中磷脂含量的变化

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实用预防医学 2017年第5期24卷 533-535页

作者：吴越朱敬丽姚建路赵硕王德才哈尔滨医科大学公共卫生学院营养与食品卫生教研室黑龙江哈尔滨150086

目的用高效液相色谱法测定2型糖尿病患者血清中五种磷脂含量的变化。方法取70例2型糖尿病患者血清、81例正常对照组人群血清;采用正向高效液相色谱法测定血清中的磷脂酰丝氨酸(PS)、磷脂酰肌醇(PI)、磷脂酰胆碱(PC)、磷脂酰乙醇胺(PE)... 详细信息

目的用高效液相色谱法测定2型糖尿病患者血清中五种磷脂含量的变化。方法取70例2型糖尿病患者血清、81例正常对照组人群血清;采用正向高效液相色谱法测定血清中的磷脂酰丝氨酸(PS)、磷脂酰肌醇(PI)、磷脂酰胆碱(PC)、磷脂酰乙醇胺(PE)、神经鞘磷脂(SM)的含量,并做对比研究。结果 2型糖尿病患者体内PS[(0.139±0.031)mg/L vs.(0.154±0.029)mg/L]、PI[(0.021±0.016)mg/L vs.(0.027±0.017)mg/L]、PC[(0.150±0.039)mg/L vs.(0.385±0.022)mg/L]、PE[(0.070±0.026)mg/L vs.(0.087±0.044)mg/L]含量均低于正常人,差异有统计学意义(均P0.05)。结论 2型糖尿病患者血清中PS、PI、PC、PE含量呈现下降趋势,提示这四种指标对糖尿病患者在正常人群中的筛查起到了辅助性作用。

关键词： 2型糖尿病高效液相色谱磷脂

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Dynamic response of UHMWPE plates under combined shock and fragment loading

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Defence Technology（防务技术） 2023年第9期27卷 9-23页

作者： Chun-Zheng zhao lu-Sheng Qiang Rui Zhang Qian-Cheng Zhang Jun-Yang Zhong Zhen-Yu zhao Tian jian lu State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing210016PR China MIIT Key Laboratory of Multi-functional Lightweight Materials and Structures(MLMS) Nanjing University of Aeronautics and AstronauticsNanjmg 210016PR China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhai430200PR China School of Aerospace Xi'an Jiaotong UniversityXi'an710049PR Chuia

Ultra-high molecular weight polyethylene(UHMWPE)fiber composite has been extensively used to construct lightweight protective structures against ballistic impacts,yet little is known about its performance when subjected to combined blast and fragment *** upon a recently developed laboratory-scale experimental technique to generate simulated combined loading through the impact of a fragment-foam composite projectile launched from a light gas gun,the dynamic responses of fullyclamped UHMWPE plates subjected to combined loading were characterized experimentally,with corresponding deformation and failure modes compared with those measured with simulated blast loading ***,to explore the underlying physical mechanisms,three-dimensional(3D)numerical simulations with the method of finite elements(FE)were systematically carried *** predictions compared favorably well with experimental measurements,thus validating the feasibility of the established FE *** to the case of blast loading alone,combined blast and fragment loading led to larger maximum deflections of clamped UHMWPE *** position of the FSP in the foam sabot affected significantly the performance of a UHMWPE target,either enhancing or decreasing its ballistic *** the blast loading and fragment impact arrived simultaneously at the target,its ballistic resistance was superior to that achieved when subjected to fragment impact alone,and benefited from the accelerated movement of the target due to simultaneous blast loading.

关键词： UHMWPE composite Ballistic performance Combined blast and fragment loading Impact test Finite element simulation

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Orbitronics for energy-efficient magnetization switching

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Science China(Information Sciences) 2025年第1期 398-399页

作者： Yuxuan YAO Daoqian ZHU Qingtao XIA jianing LIANG Yuhao jianG Zhiyang PENG Jiaxu LI Chen XIAO Renyou XU Wenwen WANG Xiantao SHANG Shiyang lu Dapeng ZHU Hong-Xi LIU Kaihua CAO Weisheng zhao Fert Beijing Institute School of Integrated Circuit Science and Engineering Beihang University National Key Lab of Spintronics Institute of International Innovation Beihang University Qingdao Research Institute Beihang University Truth Memory Corporation

Spin-orbit torque （SOT）,as a promising writing method for magnetic random-access memory （MRAM）,has garnered widespread interest for over a decade [1].Heavy metals,such as β-W,have been broadly adopted as spin current sources,but suffer from phase change at a limited thickness,resulting in a dramatic reduction of the charge-tospin conversion efficiency θSH[2].The thickness limitation leads to stringent etching conditions and large distribution among devices,posing challenges for simultaneously satisfying SOT efficiency,etching-stop margins,and back-end-ofline （BEOL） compatibility.

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基于神经网络的SINS/GPS/TAN容错组合导航系统设计

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上海航天 2003年第2期20卷 22-26页

作者：陆建新赵大炜缪栋西安第二炮兵工程学院陕西西安710025

在联邦滤波器结构的基础上 ,设计了一种基于神经网络的天文惯性导航系统 /全球卫星定位系统 /战术导航系统 (SINS/GPS/TAN)容错组合导航系统。该系统首先在各子滤波器中用神经网络滤波 (NNF)代替传统的卡尔曼滤波 ,然后用模糊神经网络 (... 详细信息

在联邦滤波器结构的基础上 ,设计了一种基于神经网络的天文惯性导航系统 /全球卫星定位系统 /战术导航系统 (SINS/GPS/TAN)容错组合导航系统。该系统首先在各子滤波器中用神经网络滤波 (NNF)代替传统的卡尔曼滤波 ,然后用模糊神经网络 (FNN)对各子系统进行故障检测 ,最后由神经元进行全局融合。通过仿真。

关键词：神经网络天文惯性导航系统全球卫星定位系统战术导航系统容错组合导航故障检测

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Additive manufacturing of metals:Microstructure evolution and multistage control

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Journal of Materials Science & Technology 2022年第5期100卷 224-236页

作者： Zhiyuan Liu Dandan zhao Pei Wang Ming Yan Can Yang Zhangwei Chen jian lu zhaoping lu Additive Manufacturing Institute College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Sino-German College of Intelligent Manufacturing Shenzhen Technology UniversityShenzhen 518118China CityU-Shenzhen Futian Research Institute Shenzhen 518045China Hong Kong Branch of National Precious Metals Material Engineering Research Center(NPMM) City University of Hong KongHong KongChina Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China

As a revolutionary industrial technology,additive manufacturing creates objects by adding materials layer by layer and hence can fabricate customized components with an unprecedented degree of *** metallic materials,unique hierarchical microstructures are constructed during additive manufacturing,which endow them with numerous excellent *** take full advantage of additive manufacturing,an in-depth understanding of the microstructure evolution mechanism is *** this end,this review explores the fundamental procedures of additive manufacturing,that is,the formation and binding of melt pools.A comprehensive processing map is proposed that integrates melt pool energy-and geometry-related process parameters *** on it,additively manufactured microstructures are developed during and after the solidification of constituent melt *** solidification structures are composed of primary columnar grains and fine secondary phases that form along the grain *** post-solidification structures include submicron scale dislocation cells stemming from internal residual stress and nanoscale precipitates induced by intrinsic heat treatment during cyclic heating of adjacent melt *** on solidification and dislocation theories,the formation mechanisms of the multistage microstructures are thoroughly analyzed,and accordingly,multistage control methods are *** addition,the underlying atomic scale structural features are briefly ***,microstructure design for additive manufacturing through adjustment of process parameters and alloy composition is addressed to fulfill the great potential of the *** review not only builds a solid microstructural framework for metallic materials produced by additive manufacturing but also provides a promising guideline to adjust their mechanical properties.

关键词： Additive manufacturing Metallic materials Melt pool Processing map Microstructure evolution

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Geochemical characteristics and formation process of natural gas in Kela 2 gas field

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Chinese Science Bulletin 2002年第S1期47卷 113-119页

作者： zhao Mengjun lu Shuangfang WANG Tingdong LI jian Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China Daqing Petroleum Institute Anda 151400.China Southwest Petroleum Institute Nanchong 637000China

On the basis of a large amount of natural gascomponents and the carbon isotope as well as some otheranalysis data in Kela 2 gas field, the geochemical character-istics, source, origin, and formation process of natural gashave been discussed. The components of gas in the field tendto be 'dry', and the drying coefficient is close to 1.0. Thecarbon isotope tends to be heavier, for instance, the averageof δ13C1 is -27.36‰ and that ofδ13C2 is -18.5‰. Compre-hensive analysis shows that humic natural gas in the Kuqapetroleum system comes mainly from Triassic and Jurassicsource rocks, and the contribution of Jurassic source rocks tothe pool maybe is more than that of Triassic rocks. The maincause that the gas tends to be dry and bears heavier isotopecomposition lies in the fact that Kela 2 natural gas is the ac-cumulation of late production of humic source rocks, and itis affected by the abnormal high pressure as well. Consider-ing the hydrocarbon generating and structural history, wecan regard the gas pool formation processes as twice fillingand twice adjusting （destroying）, that is, the filling anddestroying process in the early Himalayan movement and thefilling and adjusting in the late Himalayan movement.

关键词： natural gas geochemistry source of natural gas reservoir formation process Kela 2 gas field.

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