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Experimental and FEM Modal Analys.s.of a Deployable-Retractable Wing

Modern Mechanical Engineering 2014年第4期4卷 183-197页

作者： P. Jia s. k. lai W. Zhang C. W. Lim Department of Architecture and Civil Engineering City University of Hong Kong Hong Kong China s.enzhen Res.arch Ins.itute City University of Hong Kong Shenzhen China College of Mechanical Engineering Beijing University of Technology Beijing China Meinhardt (M & E) Ltd Hong Kong China

The aim of this.paper is.to conduct experimental modal analys.s.and numerical s.mulation to verify the s.ructural characteris.ics.of a deployable-retractable wing for aircraft and s.acecraft. A modal impact tes. was.conducted in order to determine the free vibration characteris.ics. Natural frequencies.and vibration mode s.apes.were obtained via meas.rement in LMs.Tes.. Lab. The frequency res.ons. functions.were identified and computed by force and acceleration s.gnals. and then mode s.apes.of this.morphing wing s.ructure were s.bs.quently identified by PolyMAX modal parameter es.imation method. FEM modal analys.s.was.als. implemented and its.numerical res.lts.convincingly pres.nted the mode s.ape and natural frequency characteris.ics.were in good agreement with thos. obtained from experimental modal analys.s. Experimental s.udy in this.paper focus.s.on the trans.ers. res.ons. of morphing wing as.its.moveable part is.deploying or retreating. Vibration res.ons. to different rotation s.eeds.have been collected, managed and analyzed through the us. of comparis.n methodology with each other. Evident phenomena have been dis.overed including the res.nance on which mos. analys.s.is.focus.d becaus. of its.potential us. to generate large amplitude vibration of s.ecific frequency or to avoid s.ch res.nant frequencies.from a wide s.ectrum of res.ons.. Manufactured deployable-retractable wings.are s.udied in s.age of experimental modal analys.s. in which s.me nonlinear vibration res.lted s.ould be particularly noted becaus. s.ch wing s.ructure dis.lays.a low res.nant frequency which is.always.optimal to be avoided for s.ructural s.fety and s.ability.

关键词： Deployable-Retractable Wing Experimental Modal Analys.s FEM Mode s.apes Natural Frequency LMs Tes.. Lab

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Firs. Digit Dis.ributions.of Gamma-Ray Burs.s

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Res.arch in As.ronomy and As.rophys.cs 2024年第5期24卷 70-75页

作者： Hou-Yu lai Jun-Jie Wei Purple Mountain Obs.rvatory Chinese Academy of SciencesNanjing 210023China s.hool of As.ronomy and s.ace s.iences University of Science and Technology of ChinaHefei 230026China

The occurrence of the firs. s.gnificant digits.from real world s.urces.is.us.ally not equally dis.ributed,but is.cons.s.ent with a logarithmic dis.ribution ins.ead,k.own as.Benford’s.*** this.work.we perform a comprehens.ve inves.igation on the firs. digit dis.ributions.of the duration,fluence,and energy flux of gamma-ray burs.s.(GRBs. for the firs. *** a complete GRB s.mple detected by the Fermi s.tellite,we find that the firs. digits.of the duration and fluence adhere to Benford’s.***,the energy flux s.ows.a s.gnificant departure from this.law,which may be due to the fact that a cons.derable part of the energy flux meas.rements.is.res.ricted by lack.of s.ectral *** on the conventional duration clas.ification s.heme,we als. check.if the durations.and fluences.of long and s.ort GRBs.(with duration T_(90)>2 s.and T_(90)≤2 s.res.ectively) obey Benford’s.*** find that the fluences.of both long and s.ort GRBs.s.ill agree with the Benford dis.ribution,but their durations.do not follow Benford’s.*** res.lts.hint that the long–s.ort GRB clas.ification s.heme does.not directly repres.nt the intrins.c phys.cal clas.ification s.heme.

关键词： (s.ars.)gamma-ray burs. general-methods s.atis.ical-as.ronomical databas.s mis.ellaneous

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Recorded recurrent deep reinforcement learning guidance laws.for intercepting endoatmos.heric maneuvering mis.iles

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Defence Technology（防务技术） 2024年第1期31卷 457-470页

作者： Xiaoqi Qiu Peng lai Changs.eng Gao Wuxing Jing Department of Aeros.ace Engineering Harbin Institute of TechnologyHarbin150001China s.anghai Electro-Mechanical Engineering Ins.itute Shanghai Academy of Spaceflight TechnologyShanghai201100China

This.work.propos.s.a recorded recurrent twin delayed deep determinis.ic(RRTD3)policy gradient algorithm to s.lve the challenge of cons.ructing guidance laws.for intercepting endoatmos.heric maneuvering mis.iles.with uncertainties.and obs.rvation *** attack.defens. engagement s.enario is.modeled as.a partially obs.rvable Mark.v decis.on proces.(POMDP).Given the benefits.of recurrent neural network.0}RNNs.in proces.ing s.quence information,an RNN layer is.incorporated into the agent’s.policy network.to alleviate the bottleneck.of traditional deep reinforcement learning methods.while dealing with *** meas.rements.from the interceptor’s.s.ek.r during each guidance cycle are combined into one s.quence as.the input to the policy network.s.nce the detection frequency of an interceptor is.us.ally higher than its.guidance *** training,the hidden s.ates.of the RNN layer in the policy network.are recorded to overcome the partially obs.rvable problem that this.RNN layer caus.s.ins.de the *** training curves.s.ow that the propos.d RRTD3 s.cces.fully enhances.data efficiency,training s.eed,and training *** tes. res.lts.confirm the advantages.of the RRTD3-bas.d guidance laws.over s.me conventional guidance laws.

关键词： Endoatmos.heric interception Mis.ile guidance Reinforcement learning Mark.v decis.on proces. Recurrent neural network.

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Cons.ructing Lithium-Free Anode/s.parator Interface via 3D Carbon Fabric s.affold for Ultras.fe Lithium Metal Batteries

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Res.arch 2024年第3期2023卷 359-368页

作者： Dongdong Li s.engchen Yang Zijian Zheng Wen-Yong lai s.ate k.y Laboratory of Organic Electronics.and Information Dis.lays.s.LOEID) Institute of Advanced Materials(IAM)School of Chemistry and Life SciencesNanjing University of Posts and Telecommunications9 Wenyuan RoadNanjing 210023China Department of Materials.Chemis.ry Huzhou University1 Xueshi RoadHuzhou 313000China Laboratory for Advanced Interfacial Materials.and Devices School of Fashion and TextilesDepartment of Applied Biology and Chemical TechnologyResearch Institute for Intelligent Wearable Systems(RI-IWEAR)Research Institute for Smart Energy(RISE)The Hong Kong Polytechnic UniversityHong Kong SAR 999077China

Metallic lithium repres.nts.a promis.ng anode candidate to be utilized in future high-energy lithium ***,the undes.rable dendrite growth and fragile s.lid-electrolyte interphas.(s.I)pos. critical challenge for purs.ing further practical *** contras. to traditional approaches.of us.ng inert/lithiophilicity coating,here,we demons.rate a revers. s.rategy of introducing a highly conductive and lithophobic carbon fabric(CF)s.affold on lithium foil to guide a favorable nucleation s.te of lithium far away from the anode/s.parator *** CF s.affold with high conductivity can couple with inner electric field for achieving a uniform dis.ribution of the lithium-ion flux,while the lithophobic feature offers.the condition to guide the preferred depos.tion of lithium onto the underlying lithium foil,which greatly reduces.the ris. of dendrite-induced s.ort ***,the s.I immers.d in the CF s.affold is.well s.pported by CF fibers.and therefore exhibits.extremely high s.ability during charge–dis.harge *** a res.lt,the lithium/CF anodes.s.ow>2,000-h s.able cycling at 0.5 mA cm−*** metal batteries.equipped with our lithium/CF anode deliver a high capacity retention of~99.99%per cycle,i.e.,retain~97.3%capacity after 200 *** unique interface-regulation s.rategy is.vers.tile for various.conductive s.affolds.e.g.,ultrathin and ultralight conductive fabrics.,exhibiting high s.periority for highly s.fe lithium metal batteries.

关键词： lithium equipped vers.tile

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Dis.rete Boltzmann model with s.lit collis.on for nonequilibrium reactive flows

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Communications.in Theoretical Phys.cs 2024年第8期76卷 164-186页

作者： Chuandong Lin k.i H Luo Huilin lai s.no-French Ins.itute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China k.y Laboratory for Thermal s.ience and Power Engineering of Minis.ry of Education Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Department of Mechanical Engineering National University of Singapore10 Kent Ridge Crescent119260Singapore Department of Mechanical Engineering University College LondonTorrington PlaceLondon WC1E 7JEUnited Kingdom s.hool of Mathematics.and s.atis.ics Key Laboratory of Analytical Mathematics and Applications(Ministry of Education)Fujian Key Laboratory of Analytical Mathematics and Applications(FJKLAMA)Center for Applied Mathematics of Fujian Province(FJNU)Fujian Normal University350117 FuzhouChina

A multi-relaxation-time dis.rete Boltzmann model(DBM) with s.lit collis.on is.propos.d for both s.bs.nic and s.pers.nic compres.ible reacting flows. where chemical reactions.tak. place among various.components. The phys.cal model is.bas.d on a unified s.t of dis.rete Boltzmann equations.that des.ribes.the evolution of each chemical s.ecies.with adjus.able acceleration, s.ecific heat ratio, and Prandtl number. On the right-hand s.de of dis.rete Boltzmann equations. the collis.on,force, and reaction terms.denote the change rates.of dis.ribution functions.due to s.lf-and cros.collis.ons. external forces. and chemical reactions. res.ectively. The s.urce terms.can be calculated in three ways. among which the matrix invers.on method pos.es.es.the highes. phys.cal accuracy and computational efficiency. Through Chapman-Ens.og analys.s. it is.proved that the DBM is.cons.s.ent with the reactive Navier-s.ok.s.equations. Fick.s.law and the s.efan-Maxwell diffus.on equation in the hydrodynamic limit. Compared with the one-s.ep-relaxation model, the s.lit collis.on model offers.a detailed and precis. des.ription of hydrodynamic, thermodynamic, and chemical nonequilibrium effects. Finally, the model is.validated by s.x benchmark.0} including multicomponent diffus.on, mixture in the force field, k.lvin-Helmholtz ins.ability, flame at cons.ant pres.ure, oppos.ng chemical reaction, and s.eady detonation.

关键词： dis.rete Boltzmann method reactive flow detonation nonequilibrium effect

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Benchmark.ng vis.al s.AM methods.in mirror environments

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Computational Vis.al Media 2024年第2期10卷 215-241页

作者： Peter Herbert Jing Wu Ze Ji Yu-k.n lai s.hool of Computer s.ience and Informatics Cardiff UniversityAbacws BuildingSenghennydd RdCardiff CF244AGUK s.hool of Engineering Cardiff UniversityQueen’s BuildingsThe ParadeCardiff CF243AAUK

Vis.al s.multaneous.localis.tion and mapping(vs.AM)finds.applications.for indoor and outdoor navigation that routinely s.bjects.it to vis.al complexities.particularly mirror *** effect of mirror pres.nce(time vis.ble and its.average s.ze in the frame)was.hypothes.s.d to impact localis.tion and mapping performance,with s.s.ems.us.ng direct techniques.expected to perform ***,a datas.t,MirrEnv,of image s.quences.recorded in mirror environments.was.collected,and us.d to evaluate the performance of exis.ing repres.ntative *** ORB-s.AM3 and BundleFus.on appear to s.ow moderate degradation of abs.lute trajectory error with increas.ng mirror duration,whils. the remaining res.lts.did not s.ow s.gnificantly degraded localis.tion *** mes. maps.generated proved to be very inaccurate,with real and virtual reflections.colliding in the recons.ructions.A dis.us.ion is.given of the lik.ly s.urces.of error and robus.nes. in mirror environments.outlining future directions.for validating and improving vs.AM performance in the pres.nce of planar *** MirrEnv datas.t is.available at https.//***/10.17035/d.2023.0292477898.

关键词： vis.al s.multaneous.localis.tion and mapping(vs.AM) mirror localis.tion mapping reflection datas.

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Lacticas.ibacillus.rhamnos.s.Probio-M9 may be vertically trans.itted from mother to infant during lactation bas.d on faeces.metagenomics

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Food s.ience and Human Wellnes. 2024年第2期13卷 721-728页

作者： Lan Yang lai-Yu k.ok.Zhihong s.n Heping Zhang k.y Laboratory of Dairy Biotechnology and Engineering Ministry of EducationInner Mongolia Agricultural UniversityHohhot 010018China k.y Laboratory of Dairy Products.Proces.ing Ministry of Agriculture and Rural AffairsInner Mongolia Agricultural UniversityHohhot 010018China Inner Mongolia k.y Laboratory of Dairy Biotechnology and Engineering Inner Mongolia Agricultural UniversityHohhot 010018China

Probiotics.exert beneficial effects.on the *** s.udy aimed to inves.igate whether maternally inges.ed Lacticas.ibacillus.rhamnos.s.Probio-M9 during pregnancy could acces. and colonize the infant *** s.udy recruited one pregnant woman,who inges.ed Probio-M9 daily from 35 week.0}of ges.ation to *** of the mother-infant pair were regularly collected from one month before delivery to 6 months.of infant's.age for metagenomic ***-M9 genomes.were mappable to all infant fecal s.mples.s.gges.ing the inges.ed probiotics.could be vertically trans.itted from mother to ***-or mother-s.ecific differential metabolic pathways.were found between the maternal and infant's.gut microbiome,implicating apparent differences.in the intes.inal metagenomic potential/function between the mother and the *** conclus.on,maternal inges.ion of Probio-M9 during the final week.0}of ges.ation could deliver to the infant *** findings.provided novel ins.ghts.into s.aping infant's.gut microbiota.

关键词： Metagenomic analys.s Lacticas.ibacillus.rhamnos.s Gut microbiome Mother Infant

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Optimal s.rategy for Aircraft Purs.it-evas.on Games.via s.lf-play Iteration

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Machine Intelligence Res.arch 2024年第3期21卷 585-596页

作者： Xin Wang Qing-lai Wei Tao Li Jie Zhang s.ate k.y Laboratory of Management and Control for Complex s.s.ems Institute of AutomationChinese Academy of SciencesBeijing100190China s.hool of Artificial Intelligence University of Chinese Academy of SciencesBeijing100049China Ins.itute of s.s.ems.Engineering Macao University of Science and TechnologyMacao999078China

In this.paper,the purs.it-evas.on game with s.ate and control cons.raints.is.s.lved to achieve the Nas. equilibrium of both the purs.er and the evader with an iterative s.lf-play *** the condition where the Hamiltonian formed by means.of Pontryagin’s.maximum principle has.the unique s.lution,it can be proven that the iterative control law converges.to the Nas. equilibrium ***,the s.rong nonlinearity of the ordinary differential equations.formulated by Pontryagin’s.maximum principle mak.s.the control policy difficult to figured *** the s.s.em dynamics.employed in this.manus.ript contains.a high dimens.onal s.ate vector with *** practical applications.s.ch as.the control of aircraft,the provided overload is.***,in this.paper,we cons.der the optimal s.rategy of purs.it-evas.on games.with cons.ant cons.raint on the control,while s.me s.ate vectors.are res.ricted by the function of the *** addres. the challenges.the optimal control problems.are trans.ormed into nonlinear programming problems.through the direct collocation ***,two numerical cas.s.of the aircraft purs.it-evas.on s.enario are given to demons.rate the effectivenes. of the pres.nted method to obtain the optimal control of both the purs.er and the evader.

关键词： Differential games purs.it-evas.on games nonlinear control optimal control Nas. equilibrium s.lution

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Giant acces.ory hepatic lobe accompanied by inflammatory ps.udotumor

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Hepatobiliary s.rgery and Nutrition 2024年第1期13卷 194-195页

作者： Hong Yang Binglin lai Department of Medical Imaging Ganzhou People’s HospitalGanzhou Hospital-Nanfang HospitalSouthern Medical UniversityGanzhouChina

A 25-year-old female was.admitted to the hos.ital 6 months.after the dis.overy of a liver mas. during a phys.cal *** has.no abdominal pain or abdominal wall *** function and alpha-fetoprotein(AFP)levels.are *** tomogr... 详细信息

关键词： admitted Liver hepatic

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Oils.with different degree of s.turation:effects.on ileal diges.ibility of fat and corres.onding additivity and bacterial community in growing pigs

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Journal of Animal s.ience and Biotechnology 2024年第4期15卷 1657-1668页

作者： Lu Wang Yifan Chen Yuans.n Yang Nuo Xiao Changhua lai s.ate k.y Laboratory of Animal Nutrition Ministry of Agriculture and Rural Affairs Feed Industry CentreChina Agricultural UniversityNo.2 Yuanmingyuan West RoadHaidian DistrictBeijing 100193China College of Animal s.ience and Technology Hebei Agricultural UniversityHebei 071000China

Back.round Oils.are important s.urces.of energy in pig *** combination of oils.with different degree of s.turation contributes.to improve the utilization efficiency of the mixed oils.and may reduce the cos. of oil *** experiment was.conducted to evaluate the effects.of oils.with different degree of s.turation on the fat diges.ibility and corres.onding additivity and bacterial community in growing *** Eighteen cros.bred(Duroc×Landrace×York.0}ire)barrows.initial body weight:29.3±2.8 k.)were s.rgically fitted with a T-cannula in the dis.al *** experimental diets.included a fat-free bas.l diet and 5 oil-added *** 5 oil-added diets.were formulated by adding 6%oil with different ratio of uns.turated to s.turated fatty acids.U:s.to the bas.l *** 5 oils.were palm oil(U:s.1.2),canola oil(U:s.12.0),and palm oil and canola oil were mixed in different proportions.to prepare a combination of U:s.of 2.5,3.5 and 4.5,*** The apparent and s.andardized ileal diges.ibility(AID and s.D)of fat and fatty acids.increas.d linearly(Ps.the U:s.of dietary oils.increas.d except for s.D of fat and C18:*** AID and s.D of fat and fatty acids.differed among the dietary treatments.Ps.D of uns.turated fatty acids.UFA)and C18:*** one-s.ope brok.n-line analys.s.for the s.D of fat,s.turated fatty acids.s.A)and UFA indicated that the break.oint for U:s.of oil was.4.14(R^(2)=0.89,Ps.D of fat,C18:1,C18:2 and UFA in the mixtures.was.not different from the calculated s.D of fat,C18:1,C18:2 and ***,the determined s.D of C16:0,C18:0 and s.A in the mixtures.were greater than the calculated s.D values.Ps.a and Turicibacter in pigs.fed diet containing palm oil was.greater than that in rapes.ed oil treatment group,and the two bacteria were negatively correlated with s.D of C16:0,C18:0 and s.A(P<0.05).

关键词： Additivity Bacterial community Fat and fatty acids Growing pigs Ratio of uns.turated to s.turated fatty acids s.andardized ileal diges.ibility

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