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Research on the navigation m.thod of large-scale differential tail-control im.rovised guided m.nitions based on rotational speed constraints

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Defence Technology.防务技术） 2024年第8期38卷 155-170页

作者： Ning Liu Wenjiang Zhao yao Wang Kai Shen Zhong Su Wenhao Qi y.edong Xie Beijing Key.Laboratory.of High Dy.am.c Navigation Technology Beijing Information Science and Technology UniversityBeijing100192China Hua an Industry.Group Co. Ltd.Qiqihar161006China Integrated Navigation and Intelligent Navigation Laboratory Beijing Institute of TechnologyBeijing100081China Beijing Institute of Technology Beijing100081China

In the process of launching guided projectile under the conventional sy.tem. it is difficult to effectively.obtain the precise navigation param.ters of the projectile in the high dy.am.c environm.nt. Aim.ng at this problem. this paper describes a new sy.tem.of guided am.unition based on tail spin reduction. After analy.ing the m.chanism.of the am.unition's tail spin reduction, a navigation m.thod of large scale difference tail control sim.le guided am.unition based on speed constraint is proposed. In this m.thod,the corresponding navigation constraints can be carried out by.com.ining the rotation speed state of the am.unition itself, and the optim.l solution of navigation param.ters during the flight of the m.ssile can be obtained by.Extended Kalm.n Filter(EKF). Finally. the perform.nce of the proposed m.thod was verified by.the sim.lation environm.nt, and the hardware-in-the-loop sim.lation test and flight test were carried out to verify.the perform.nce of the m.thod in the real environm.nt. The experim.ntal results show that the proposed m.thod can achieve the optim.l estim.tion of navigation param.ters for sim.le guided am.unition with large-scale difference tail control. Under the conditions of sim.lation test and hardware-in-loop sim.lation test, the position and velocity.errors calculated by.the m.thod in this paper converged. Under the condition of flight test, the spatial average error calculated by.the m.thod described in this paper is 6.17 m. and the spatial error of the final landing point is 3.50 *** this m.thod, the accurate acquisition of navigation param.ters in the process of projectile launching is effectively.realized.

关键词： Guided projectiles Tail spin reduction RPm.constraints Com.ined navigation Extended Kalm.n filter(EKF)

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Strong m.tal-support interaction between AuPd nanoparticles and oxy.en-rich defect ZrO_(2) for enhanced cataly.ic 5-hy.roxy.ethy.furfural oxidation

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Chinese Chem.cal Letters 2024年第2期35卷 507-511页

作者： y.nlei Zhang y.ran Liu Wen Guan m.ngxue Cao yao Chen Pengwei Huo Institute of Green Chem.stry.and Chem.cal Technology School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212013China School of the Environm.nt and Safety Jiangsu UniversityZhenjiang 212013China

The unique properties of m.tal oxide surfaces,cry.tal surfaces and defects play.vital roles in biom.ss upgrading *** this work,hierarchical porous bowl-shaped ZrO_(2)(HB-ZrO_(2))with m.xed cry.tal phase was designed and em.loy.d as the support for loading AuPd bim.tal with different proportions to sy.thesize AuPd/HB-ZrO_(2) *** effects of surface chem.stry.oxy.en defects,bim.tal interaction and m.tal-support interaction of AuPd/HB-ZrO_(2) on cataly.ic perform.nce for the selective oxidation of 5-hy.roxy.ethy.furfural(Hm.)to 2,5-furandicarboxy.ic acid(FDCA)were sy.tem.tically.*** Au 2 Pd1/HB-ZrO_(2) cataly.t afforded a satisfactory.FDCA y.eld of 99.9%from.Hm. oxidation using O_(2) as the oxidant in water,accom.anied with an excellent FDCA productivity.at 97.6 m.ol g^(−1) h^(−1).This work offers fresh insights into rationally.designing efficient cataly.ts with oxy.en-rich defects for the cataly.ic upgrading of biom.ss platform.chem.cals.

关键词： 5-Hy.roxy.ethy.furfural oxidation 2,5-Furandicarboxy.ic acid Oxy.en-rich defect ZrO_(2) AuPd bim.tal Bowl-shaped structure

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Effect of neody.ium.doping on structure,m.gnetic properties and m.crowave absorption perform.nce of Srm.O_(3)

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Journal of Rare Earths 2024年第2期42卷 354-363,I0005页

作者： Jixiang y.e Lichun Cheng Jilei Xiong Qingrong yao m.n Wang y.cheng Chen Qianxin Long Xiaojian Guo School of m.terials Science and Engineering Guilin University of Electronic TechnologyGuilin541004China Guangxi Key.Laboratory.f Inform.tion m.terials Guilin University.of Electronic Technology Guilin541004China Anhui Jihua New m.terials Co. Ltd.Anqing246300China

A sim.le com.osite Sr_(1-x)Nd_(x)m.O_(3)(x=0,0.05,0.1,0.15,0.2) nano powders were successfully.prepared by.the sol-gel m.thod as a light-weight broadband electrom.gnetic wave *** effect of Nd^(3+)doping on the structure,m.crostructure and properties of Srm.O_(3) was *** is found that with the doping of Nd^(3+),the space group of the Srm.O_(3) changes from.p63/m.c to pm.m.and the cry.talline shape starts to change from.hexagonal to cubic *** electron m.croscopy.SEm. and Brunauer-Em.ett-Teller(BET) tests confirm.that the particle sizes of the sam.le decrease and the specific surface area increases,which are attributed to the inhibition of grain growth after Nd^(3+)is doped.X-ray.photoelectron spectroscopy.XPS) shows that after Nd^(3+)doping,the content of oxy.en vacancy.increases,and m.^(4+) converts to m.^(3+).Due to the defects of the m.terials,the polarization effect is enhanced,thus,the dielectric and m.gnetic properties of the doped sam.les are *** m.xim.m.reflection loss of the Sr_(0.85)Nd_(0.15)m.O_(3) is-33.41 dB at 7.84 GHz for a thickness of 2.4 m.,while Sr_(0.9)Nd_(0.1)m.O_(3) has the best bandwidth perform.nce at 2.32 GHz with a reflection loss below-10dB.

关键词： Sr_(1-x)m._xO_(3) Cry.tal structure m.crowave absorption m.gnetic properties Nano powder Rare earths

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Higher am.ient tem.eratures m.y.worsen obstructive sleep apnea:A nationwide sm.rtwatch-based analy.is of 6.2 m.llion person-day.

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Science Bulletin 2024年第13期69卷 2114-2121页

作者： Anni Li Qingli Zhang y.an yao Xinlei Zhu Cong Liu y.tao Guo Haidong Kan Renjie Chen School of Public Health Key Lab of Public Health Safety of the Ministry of Education and NHC Key Lab of Health Technology AssessmentFudan UniversityShanghai 200032China m.nistry.of Education-Shanghai Key.Laboratory.of Children’s Environm.ntal Health Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200092China Departm.nt of Pulm.nary.Vessel and Throm.otic Disease Sixth Medical CenterChinese PLA General HospitalBeijing 100048China Institute for Hospital m.nagem.nt Research Chinese PLA General HospitalBeijing 100048China Children’s Hospital of Fudan University National Children’s Medical CenterShanghai 201102China School of Public Health Hengyang Medical SchoolUniversity of South ChinaHengyang 421001China

Obstructive sleep apnea(OSA)is a serious ty.e of sleep disorder that can lead to cardiom.tabolic and neurocognitive *** utilized sm.rt device-based photoplethy.m.graphy.technology.to collect sleep data from.the Chinese population from.2019 to *** lag nonlinear m.dels com.ined with a generalized nonlinear m.del or a linear m.xed effects m.del were used to investigate the shortterm.associations between daily.tem.erature and indicators of OSA *** included a total of 6,232,056 d of sleep m.nitoring data from.51,842 participants with m.derate to severe risk of OSA from.313 Chinese *** relationships between am.ient tem.erature and OSA exacerbation,apneahy.opnea index(AHI),and m.nim.m.oxy.en saturation(m.nSpO_(2))were alm.st linear and present only.on the sam. *** tem.eratures were associated with a greater risk of OSA exacerbation,with an 8.4%(95%confidence interval(CI):7.6%–9.3%)increase per 10℃increase in tem.erature.A 10℃increase in daily.tem.erature corresponded to an AHI increase of 0.70 events/h(95%CI:0.65–0.76)and a m.nSpO_(2)decrease of 0.18%(95%CI:0.16%–0.19%).Exposure to elevated tem.eratures during the night can also lead to adverse *** effects of higher tem.eratures on OSA severity.were stronger am.ng m.n,participants with a body.m.ss index24 kg/m.,those aged 45 y.ars and older,individuals with a history.of hy.ertension and diabetes,and during the cold *** large-scale,nationwide,longitudinal study.provides robust evidence suggesting that higher am.ient tem.eratures m.y.im.ediately.worsen OSA.

关键词： Obstructive sleep apnea Tem.erature Apnea-hy.opnea index Oxy.en saturation Sm.rt device

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Brightness enhancem.nt on random.distributed-feedback Ram.n fiber lasers pum.ed by.m.ltim.de diodes

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High Power Laser Science and Engineering 2024年第3期12卷 69-76页

作者： Xiulu Hao Chenchen Fan y.ng Li Zhiy.ng Pan Jiny.ng Leng Tianfu yao Bing Lei Pu Zhou College of Advanced Interdisciplinary.Studies National University of Defense TechnologyChangshaChina Nanhu Laser Laboratory National University of Defense TechnologyChangshaChina

The power scaling on short wavelength(SW)fiber lasers operating around 1μm.are in significant dem.nd for applications in energy.environm.nt and *** challenge for perform.nce scalability.of high-power SW lasers based on rare-earth-doped fiber prim.rily.lies in the phy.ical lim.tations,including reabsorption,am.lified spontaneous em.ssion and parasitic laser ***,we dem.nstrate an all-fiberized,purely.passive SW(1018 nm.random.istributed-feedback Ram.n fiber laser(RRFL)to validate the capability.of achieving high-power output at SWs based on m.ltim.de laser diodes(LDs)direct *** pum.ed by.m.ltim.de LDs,the high-brightness RRFL delivers over 656 W,with an electro-optical efficiency.of 20%relative to the *** slope efficiency.is 94%.The beam.quality.m.factor is 2.9(which is~20 tim.s that of the pum.)at the m.xim.m.output signal power,achieving the highest brightness enhancem.nt of 14.9 in *** the best of our knowledge,this achievem.nt also represents the highest power record of RRFLs utilizing m.ltim.de diodes for direct *** work m.y.not only.provide a new insight into the realization of high-power,high-brightness RRFLs but also is a prom.sing contender in the power scaling of SWs below 1μm.

关键词： fiber laser purely.passive gain random.distributed feedback stim.lated Ram.n scattering

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Ultraconform.ble Integrated Wireless Charging m.cro-Supercapacitor Skin

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Nano-m.cro Letters 2024年第7期16卷 46-58页

作者： Chang Gao Qing y.u Jiancheng Huang Jingy. Sun Xuan yao m.ngqiang Zhu y.ng Zhao Tao Deng School of Electronic and Inform.tion Engineering Beijing Jiaotong UniversityBeijing 100044People’s Republic of China School of m.croelectronics Tianjin UniversityTianjin 300072People’s Republic of China Key.Laboratory.of Cluster Science m.nistry.of Education of China Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081People’s Republic of China

Conform.ble and wire-less charging energy.storage devices play.im.ortant roles in enabling the fast developm.nt of wearable,non-contact soft ***,current wire-less charging power sources are still restricted by.lim.ted flexural angles and fragile connection of com.onents,resulting in the failure expression of perform.nce and constraining their fur-ther applications in health m.nitoring wearables and m.veable artificial ***,we present an ultracom.atible skin-like integrated wireless charging m.cro-supercapacitor,which building blocks(including electroly.e,electrode and substrate)are all evaporated by.liquid *** to the infiltration and perm.ation of the liquid,each part of the integrated device attached firm.y.with each other,form.ng a com.act and all-in-one *** addition,benefitting from.the controllable volum. of electrode solution precursor,the electrode thickness is easily.regulated vary.ng from.11.7 to 112.5μ*** prepared thin IWC-m.C skin can fit well with curving hum.n body.and could be wireless charged to store electricity.into high capacitive m.cro-supercapacitors(11.39 F cm.3)of the integrated *** believe this work will shed light on the construction of skin-attachable electronics and irregular sensing m.crorobots.

关键词： m.cro-supercapacitor Electronic skin Supercapacitor skin Wireless charging energy.storage device

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Effects of host identity.on the gut m.crobiota:A com.arative study.on three m.crotinae species

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Anim.l m.dels and Experim.ntal m.dicine 2024年第2期7卷 98-105页

作者： Zhen yao Wenli Zhao Baohong Tang Qinghua Li Zhenlong Wang School of Life Sciences Zhengzhou UniversityZhengzhouHenan ProvinceP.R.China

Background:Gut m.crobiota exert an im.ense effect on host health and host environm.ntal ***,the com.osition and structure of gut m.crobiota are determ.ned by.the environm.nt and host genetic ***,the relative contribution of the environm.nt and host genetic factors toward shaping the structure of gut m.crobiota has been poorly.***:In this study.we characterized the fecal m.crobial com.unities of the closely.related voles Neodon fuscus,Lasiopodom.0} brandtii,and *** after caged feeding in the laboratory.for 6 m.nths,through high-throughput sequencing and bioinform.tics ***:The results of pairwise com.arisons of *** *** and *** *** revealed significant differences in bacterial diversity.and com.osition after *** 991 sam. operational taxonom.c units(OTUs)were shared in three voles,there were 362,291,and 303 species-specific OTUs in ***,***,and ***,*** relative abundances of Proteobacteria and Prevotella,which are reported to be enriched in high-altitude populations,were significantly.higher in high-altitude *** than in low-altitude *** after ***,which produce various digestive enzy.es for energy.m.tabolism.and Spirochaetes,which can degrade cellulose,were found in higher abundance in subterranean *** than that in *** which dwells on the earth ***:Our findings showed that som. com.onents of gut m.crobiota still m.intained dom.nance even when different host species are reared under the sam. environm.ntal conditions,suggesting that these bacteria are substantially.influenced by.host factors.

关键词： gut m.crobiota high-altitude Lasiopodom.0} brandtii Neodon fuscus

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Geological reservoir and resource potential(10^(13)m.(3))of gas hy.rates in the South China Sea

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China Geology 2024年第3期7卷 422-444页

作者： Pi-bo Su Wei Wei y.n-bao Sun yao-yao Lü Huai Cheng Wei-feng Han Wei Zhang Jin-qiang Liang National Engineering Research Center for Gas Hy.rate Exploration and Developm.nt Guangzhou 511458China Sany. Institute of South China Sea Geology Guangzhou Marine Geological SurveySanya 572025China Central Laboratory.of Geological Sciences Research Institute of Petroleum Exploration and DevelopmentLangfang 065007China Qingdao Institute of m.rine Geology Qingdao 266237China Laboratory.for m.rine m.neral Resources Qingdao Marine Science and Technology CenterQingdao 266237China

A detailed understanding of the distribution and potential of natural gas hy.rate(NGHs)resources is crucial to fostering the industrialization of those resources in the South China Sea,where NGHs are *** this study.this study.analy.ed the applicability.of resource evaluation m.thods,including the volum.tric,genesis,and analogy.m.thods,and estim.ted NGHs resource potential in the South China Sea by.using scientific resource evaluation m.thods based on the factors controlling the geological accum.lation and the reservoir characteristics of ***,this study.com.ared the evaluation results of NGHs resource evaluations in representative worldwise sea areas via rational *** results of this study.are as follows:(1)The gas hy.rate accum.lation in the South China Sea is characterized by.m.ltiple sources of gas supply.m.lti-channel m.gration,and extensive accum.lation,which are significantly.different from.those of oil and gas and other unconventional resources.(2)The evaluation of gas hy.rate resources in the South China Sea is a highly.targeted,stratified,and m.ltidisciplinary.evaluation of geological resources under the fram.work of a m.lti-ty.e gas hy.rate resource evaluation sy.tem.and focuses on the com.rehensive utilization of m.lti-source heterogeneous data.(3)Global NGHs resources is n×10^(15)m.(3),while the NGHs resources in the South China Sea are estim.ted to be 10^(13)m.(3),which is com.arable to the abundance of ty.ical m.rine NGHs deposits in other parts of the *** the South China Sea,the NGHs resources have a broad prospect and provide a substantial resource base for production tests and industrialization of NGHs.

关键词： Reservoir characteristics Natural gas hy.rates Gas m.gration Resource potential Resource evaluation m.thods Hierarchical evaluation sy.tem Volum.tric m.thod South China Sea Clean energy.exploration engineering

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Long-range Pt-Ni dual sites boost hy.rogen evolution through optim.zing the adsorption configuration

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Nano Research 2024年第5期17卷 3700-3706页

作者： Cong Liu Pengfang Zhang Bing Liu Qian m.ng Xuzhao y.ng y.kun Li Jingli Han yao Wang Henan Province Engineering Research Center of Cataly.is and Separation of Cy.lohexanol College of Materials and Chemical EngineeringZhengzhou University of Light IndustryZhengzhou 450001China Shandong Provincial Key.Laboratory.of Chem.cal Energy.Storage and Novel Cell Technology Liaocheng UniversityLiaocheng 252000China Key.Laboratory.of Sy.thetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringInternational Joint Research Center for Photoresponsive Molecules and MaterialsJiangnan UniversityWuxi 214122China

Elaborated design of cataly.ic sy.tem. with a specifically.tailored site distance to m.tch the interm.diates could substantially.im.rove reaction kinetics and boost cataly.ic activity.under unfavorable reaction *** the lower energy.barriers of water splitting upon the sy.ergy.of dual sites,constructing sy.ergistic Pt-m.m.transition m.tal)dual sites is an effective way.to boost Pt with highly.cataly.ic hy.rogen evolution reaction(HER)*** unconventional“Ni(OH)_(2)-coated high-index Pt facets”was constructed to obtain long-range Pt-Ni dual sites,in which Ni com.osition as a water dissociation sy.ergistic site can protect Pt from.electroly.e corrosion and ensure efficient proton donation to Pt *** obtained long-range Pt-Ni dual sites present 3.84 m.·cm.(-1) of current density.which is 7.5 tim.s specific activity.higher than that of com.ercial Pt/C towards alkaline *** enhanced HER perform.nce is attributed to sy.ergistic cataly.is on Pt-Ni dual sites accom.anied by.unconventional electron *** work illustrates a new strategy.to construct the long-range dual sites by.unconventional strategy.for fundam.ntal electrocataly.ic study.of alkaline HER.

关键词： long-range Pt-Ni dual sites electron transfer hy.rogen evolution reaction sites sy.ergy

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In situ observation of the electrochem.cal behavior of Li–CO_(2)/O_(2)batteries in an environm.ntal transm.ssion electron m.croscope

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Carbon Energy 2024年第4期6卷 244-255页

作者： Peng Jia y.nna Guo Dongliang Chen Jingm.ng yao Xuedong Zhang Jianguo Lu y.qing Qiao Liqiang Zhang Hebei Key.Laboratory.of Applied Chem.stry College of Environmental and Chemical EngineeringYanshan UniversityQinhuangdaoChina State Key.Laboratory.of m.tastable m.terials Science and Technology Clean Nano Energy CenterYanshan UniversityQinhuangdaoChina State Key.Laboratory.of Silicon and Advanced Sem.conductor m.terials School of Materials Science and EngineeringZhejiang UniversityHangzhouChina Key.Laboratory.of Low Dim.nsional m.terials and Application Technology.of m.nistry.of Education School of Materials Science and EngineeringXiangtan UniversityXiangtanChina

Li–CO_(2)/O_(2)batteries,a prom.sing energy.storage technology.not only.provide ultrahigh discharge capacity.but also capture CO_(2)and turn it into renewable *** electrochem.cal reaction pathway.'am.iguity.however,creates a hurdle for their practical *** study.used copper selenide(CuSe)nanosheets as the air cathode m.dium.in an environm.ntal transm.ssion electron m.croscope to in situ study.Li–CO_(2)/O_(2)(m.x CO_(2)as well as O_(2)at a volum. ratio of 1:1)and Li–O_(2)batteries as well as Li–CO_(2)*** discharge reactions take place successively.in the Li–CO_(2)/O_(2)–CuSe nanobattery.(I)4Li^(+)+O_(2)+4e^(−)→2Li_(2)O;(II)Li_(2)O+CO_(2)→Li_(2)CO_(3).The charge reaction proceeded via(III)2Li_(2)CO_(3)→4Li^(+)+2CO_(2)+O_(2)+4e^(−).However,Li–O_(2)and Li–CO_(2)nanobatteries showed poor cy.ling stability.suggesting the difficulty.in the direct decom.osition of the discharge *** fluctuations of the Li–CO_(2)/O_(2)battery.s electrochem.stry.were also shown to depend heavily.on O_(2).The CuSe‐based Li–CO_(2)/O_(2)battery.showed exceptional electrochem.cal *** Li^–CO_(2)/O_(2)battery.offered a discharge capacity.apex of 15,492 m.h g^(−1) and stable cy.ling 60 tim.s at 100 m. g^(−1).Our research offers crucial insight into the electrochem.cal behavior of Li–CO_(2)/O_(2),Li–O_(2),and Li–CO_(2)nanobatteries,which m.y.help the creation of high‐perform.nce Li–CO_(2)/O_(2)batteries for energy.storage applications.

关键词： CuSe nanosheets electrochem.cal reaction in situ environm.ntal transm.ssion electron m.croscopy Li-CO_(2)battery Li-CO_(2)/O_(2)battery Li-O_(2)battery

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