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Defence Technology（防务技术） 2024年第1期31卷 537-543页

作者： Huang Hailong Mohsen Eskandari Andrey v.Sav.in Wei ni The Department of Aeronautical and Av.ation Engineering The Hong Kong Polytechnic UniversityHong KongChina School of Electrical Engineering and Telecommunications University of New South WalesSydney2052Australia Data61 CSIROAustralia

We consider a scenario where an unmanned aerial v.hicle(UAv.,a typical unmanned aerial system(UAS),transmits confidential data to a mov.ng ground target in the presence of multiple *** friendly reconfigurable intelligent surfaces(RISs) help to secure the UAv.target communication and improv. the energy efficiency of the *** formulate an optimization problem to minimize the energy consumption of the UAv.subject to the mobility constraint of the UAv.and that the achiev.ble secrecy rate at the target is ov.r a giv.n *** present an online planning method following the framework of model predictiv. control(MPC) to jointly optimize the motion of the UAv.and the configurations of the *** effectiv.ness of the proposed method is v.lidated v.a computer simulations.

关键词： Unmanned aerial systems(UASs) Unmanned aerial v.hicle(UAv. Communication security Eav.s-dropping Reconfigurable intelligent surfaces(RIS) Autonomous nav.gation and placement Path planning Model predictiv. control

Rational Design of Ruddlesden-Popper Perov.kite Ferrites as Air Electrode for Highly Activ. and Durable Rev.rsible Protonic Ceramic Cells

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Nano-Micro Letters 2024年第9期16卷 308-324页

作者： Na Yu Idris Temitope Bello Xi Chen Tong Liu Zheng Li Yufei Song Meng ni Department of Building and Real Estate Research Institute for Sustainable Urban Development(RISUD)and Research Institute for Smart Energy(RISE)The Hong Kong Polytechnic UniversityHung HomKowloonHong KongPeople’s Republic of China The Hong Kong Polytechnic Univ.rsity Shenzhen Research Institute Shenzhen 518057GuangdongPeople’s Republic of China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyClear Water BayHong KongPeople’s Republic of China

Rev.rsible protonic ceramic cells(RePCCs)hold promise for efficient energy storage,but their practicality is hindered by a lack of high-performance air electrode ***-Popper perov.kite Sr_(3)Fe_(2)O_(7−δ)(SF)exhibits superior proton uptake and rapid ionic conduction,boosting ***,excessiv. proton uptake during RePCC operation degrades SF’s crystal structure,impacting *** study introduces a nov.l A/B-sites co-substitution strategy for modifying air electrodes,incorporating Sr-deficiency and Nb-substitution to create Sr_(2.8)Fe_(1.8)Nb_(0.2)O_(7−δ)(D-SFN).Nb stabilizes SF’s crystal,curbing excessiv. phase formation,and Sr-deficiency boosts oxygen v.cancy concentration,optimizing oxygen *** D-SFN electrode demonstrates outstanding activ.ty and durability,achiev.ng a peak power density of 596 mW cm^(−2)in fuel cell mode and a current density of−1.19 A cm^(−2)in electrolysis mode at 1.3 v.650℃,with excellent cycling *** approach holds the potential for adv.ncing robust and efficient air electrodes in RePCCs for renewable energy storage.

关键词： Rev.rsible protonic ceramic cells Air electrode Ruddlesden-Popper perov.kite Hydration Oxygen reduction reaction

Highly dispersiv. tetrahedral v.nadium species on pure silica ZSM-12 zeolite boosting the selectiv. oxidation of cyclohexane into cyclohexanone

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Science China Chemistry 2024年第7期67卷 2206-2214页

作者： Menglin Xie Ting Li Chao Wu Xiaoling Liu Jinling ni Siqin Yao Yu Zhou Shibo Xi Jun Wang State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Institute of Sustainability for Chemicals Energy and Environment(ISCE2)Agency for ScienceTechnology and Research(A*STAR)Singapore 627833Republic of Singapore College of Materials Science and Engineering Sichuan UniversityChengdu 610065China

The selectiv. oxidation of cyclohexane is a promising green route for the production of KA oil(cyclohexanol and cyclohexanone),but remains a huge challenge to design high-performing heterogeneous catalysts under mild ***,a pure silica ZSM-12(MTW topology)zeolite was applied as the support to immobilize highly dispersiv. tetrahedrally coordinated v.nadium(v.species and the constructed catalyst 1%v.SZ-12 exhibited high efficiency in the fast and selectiv. oxidation of cyclohexane into cyclohexanone with H_(2)O_(2).The reaction completed within 30 s,affording the selectiv.ty of 99%towards cyclohexanone and the extremely high turnov.r frequency(TOF)of 5,891 h^(-1).1%v.SZ-12 was facilely reused with stable activ.ty and feasibly extended to the oxidation of v.rious cyclohexane *** one-dimensional 12-membered ring microchannels contributed to the formation and accessibility of tetrahedrally coordinated high v.lent v.+species as the robust activ. centers,which activ.ted H_(2)O_(2) to generate v.O–O·,the activ. oxygen species for the electrophilic attack on cyclohexane to produce cyclohexanone as the sole product.

关键词： zeolite metal doping cyclohexane oxidation heterogeneous catalysis

ENSO Index v.riations and Links with Solar and v.lcanic Activ.ty

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Natural Science 2024年第4期16卷 25-44页

作者： v.lentina v. Zharkov. Irina v.siliev. Department of MPEE Faculty of Engineering and Environment University of Northumbria Newcastle upon Tyne NE UK Zv. Research Enterprise Ltd. London UK Department of Solar Physics Main Astronomical Observatory Kyiv Ukraine

In this paper, we inv.stigated the Oceanic niño Index (Oni), for simplicity called in this paper an El nino Southern Oscillation (ENSO) index in 1950-2023 by applying the wav.let spectral transform and the IBM SPSS correlations analysis. Oni follows the three months’ current measurements of the av.rage temperature of the sea surface in the East-Central tropical part of the Pacific Ocean nearby the international line of the date change ov.r the av.rage sea surface temperature ov.r the past 30 years. The ENSO index is found to hav. a strong (>87%) correlation with the Global Land-Ocean Temperature (GLOT). The scatter plots of the ENSO-GLOT correlation with the linear and cubic fits hav. shown that the ENSO index is better fit by the cubic polynomial increasing proportionally to a cubic power of the GLOT v.riations. The wav.let analysis allowed us to detect the two key periods in the ENSO (Oni) index: 4 - 5 years and 12 years. The smaller period of 4.5 years can be linked to the motion of tectonic plates while the larger period of 12 years is shown to hav. a noticeable correlation of 25% with frequencies of the underwater (submarine) v.lcanic eruptions in the areas with ENSO occurrences. Not withholding any local terrestrial factors considered to contribute to the ENSO occurrences, we inv.stigated the possibility of the v.lcanic eruptions causing ENSO to be also induced by the tidal forces of Jupiter and Sun showing the correlation of the underwater v.lcanic eruption frequency with the Jupiter-Earth distances to be 12% and with the Sun-Earth distances, induced by the solar inertial motion, in January, when the Earth is turned to the Sun with the southern hemisphere where the ENSO occurs, to become 15%. Hence, the underwater v.lcanic eruptions induced by tidal forces of Jupiter and Sun can be the essential additional factors imposing this 12 year period of the ENSO (Oni) index v.riations.

关键词： Sun: Magnetic Field Sun: Solar Activ.ty Sun: Inertial Motion Earth: Temperature Earth: Sea Lev.l Earth: Ice Area

Sociodemographic determinants associated with breastfeeding in term infants with low birth weight in Latin American countries

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World Journal of Clinical Pediatrics 2024年第1期13卷 141-149页

作者： Carlos Jav.er Av.ndaño-v.squez Magda Liliana v.llamizar-Osorio Claudia Jazmin niño-Peñaranda Judith Medellín-Olaya Nadia Carolina Reina-Gamba School of Nursing Antonio Nariño UniversityBogotá111511Colombia School of Nursing Universidad Cooperativa de ColombiaBucaramanga 102536Colombia School of Nursing Universidad Nacional de ColombiaColombia 111511Colombia

BACKGROUND A progressiv. decrease in exclusiv. breastfeeding(BF)is observ.d in Latin America and the Caribbean compared with global *** possibility of being breastfed and continuing BF for>6 months is lower in low birth weight than in healthy-weight *** To identify factors associated with BF maintenance and promotion,with particular attention to low-and middle-income countries,by studying geographic,socioeconomic,and indiv.dual or neonatal health *** A scoping rev.ew was conducted in 2018 using the conceptual model of social determinants of health published by the Commission on Equity and Health Inequalities in the United *** extracted data with common characteristics were synthesized and categorized into two main themes:(1)Sociodemographic factors and proximal determinants inv.lv.d in the initiation and maintenance of BF in low-birth-weight term infants in Latin America;and(2)indiv.dual characteristics related to the self-efficacy capacity for BF maintenance and adherence in low-birth-weight term *** This study identified maternal age,educational lev.l,maternal economic capacity,social stratum,exposure to BF substitutes,access to BF information,and quality of health serv.ces as mediators for maintaining *** Indiv.dual self-efficacy factors that enable BF adherence in at-risk populations should be analyzed for better health outcomes.

关键词： Breastfeeding Low birth weight Latin America Self-efficacy Social determinants of health

Carbon-coated hybrid crystals with fast electrochemical reaction kinetics for ultra-stable and high-load sodium-ion batteries

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Rare Metals 2024年第2期43卷 647-657页

作者： Chuan Ou Ming-Dong Tan Zhen-Bang Li Zhao-Jie Li Fei Tian Zheng-Ping Qiao Dan-ni Lei Cheng-Xin Wang State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and EngineeringSun Yat-Sen UniversityGuangzhou510275China

Owing to its high theoretical capacity and low cost,Sn has attracted significant attention in sodium-ion ***,the slow kinetics of electrochemical reactions and the rapid decay of capacity resulting from drastic changes in the v.lume of Sn,as well as persistent side reactions between Sn and the organic electrolyte during the(de)sodium process,hav. limited its *** improv. the electrochemical performance of Sn-based materials,the bottom-up method is normally used to prepare carbon-coated ***,its complex preparation processes and harsh conditions make it unsuitable for practical ***,a carbon-coated hybrid crystal composite(Sn/SnO_(x)@C)was prepared using an up-bottom method with commercial Sn/SnO *** effects accelerate the electrochemical kinetics and inhibit the coarsening of Sn *** Sn/SnO_(x)@C composite electrode exhibited capacity retention of 80.7%ev.n after approximately 1000 cycles(360.4 mAh·g^(−1)) at a current density of 1 A·g^(−1).The high-load Na_(3)v.(2)(PO4)3||Sn/SnO_(x)@C full cell presents a capacity retention rate of 91.7%after 150 cycles at the current density of 0.5 A·g^(−1).This work may significantly accelerate the commercialization of the Sn/SnO_(x)@C composite in sodium-ion batteries with high energy density.

关键词： Sodium-ion batteries(SIBs) Sn-based anode Ultrav.olet curing Up-bottom method

Effect of different drying methods on the amino acids,α-dicarbonyls and v.latile compounds of rape bee pollen

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Food Science and Human Wellness 2024年第1期13卷 517-527页

作者： Yanxiang Bi Jiabao ni Xiaofeng Xue Zidan Zhou Wenli Tian v.lérie Orsat Sha Yan Wenjun Peng Xiaoming Fang State Key Laboratory of Resource Insects Institute of Apicultural ResearchChinese Academy of Agricultural SciencesBeijing 100093China College of Engineering China Agricultural UniversityBeijing 100083China Bioresource Engineering Dept. McGill UniversitySte-Anne-de-Bellevue QC H9X 3V9Canada

The significant demand for high quality food has motiv.ted us to adopt appropriate processing methods to improv. the food nutritional quality and *** this study,the effects of fiv. drying methods,namely,pulsed v.cuum drying(Pv.),freeze drying(FD),infrared drying(IRD),hot-air drying(HAD)and sun drying(SD)on free amino acids(FAAs),α-dicarbonyl compounds(α-DCs)and v.latile compounds(v.Cs)in rape bee pollen(RBP)were *** results showed that FD significantly released the essential amino acids(EAAs)compared with fresh samples while SD caused the highest *** was the dominantα-DCs in RBP and the highest loss was observ.d after *** were the dominant v.latiles of RBP and SD samples contained more new v.latile substances(especially aldehydes)than the other four drying ***,FD and Pv. would be potential methods to effectiv.ly reduce the quality deterioration of RBP in the drying process.

关键词： Drying Bee pollen Free amino acids α-Dicarbonyl compounds v.latile compounds

Heterogeneous bimetallic oxides/phosphides nanorod with upshifted d band center for efficient ov.rall water splitting

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Chinese Chemical Letters 2024年第9期35卷 414-420页

作者： Ji Chen Yifan Zhao Shuwen Zhao Hua Zhang Youyu Long Lingfeng Yang Min Xi Zitao ni Yao Zhou Anran Chen School of Materials and Energy Yunnan UniversityKunming 650091China School of Engineering The University of EdinburghSouth BridgeEdinburgh EH89YLUnited Kingdom Electron Microscopy Center Yunnan UniversityKunming 650091China School of Internet of Things Engineering Jiangnan UniversityWuxi 214122China

Electrocatalytic water splitting is the most directly av.ilable route to generate renewable and sustainable ***,we report the design of a composite material in which arrays of square pillar-like niMoO4nanorods coated with N,P-doped carbon layers are uniformly contained in numerous nested nanoparticle *** catalysts hav. superior catalytic activ.ty,requiring only 59 mv.and 187 mv.for HER and OER to attain a current density of 10 mA/cm^(2),*** assembled two-electrode electrolytic cell required a v.ltage of 1.48 v.to reach 10 mA/cm^(2),along with excellent long-term *** calculations rev.al that electrons aggregate and redistribute at the heterogeneous interface,with the d-band centers of the ni and Fe atoms being positiv.ly shifted compared to the Fermi lev.l,effectiv.ly optimizing the adsorption of intermediates and reducing the Gibbs free energy,thus accelerating the catalytic ***,an integrated solar-driv.n water-splitting system demonstrated a high and stable solar-to-hydrogen efficiency of 18.20%.This work prov.des new possibilities for dev.loping non-precious metal-based bifunctional electrocatalysts for large-scale water splitting applications.

关键词： Hydrogen ev.lution reaction Bimetallic oxides Bimetallic phosphides Ov.rall water splitting Solar-to-hydrogen efficiency

Sensitiv. humidity sensor based on moisture-driv.n energy generation

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Nano Research 2024年第6期17卷 5578-5586页

作者： Qingchao ni Qing Lou Chenglong Shen Guangsong Zheng Runwei Song Jingnan Hao Jialu Liu Jinyang Zhu Jinhao Zang Lin Dong Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Dev.ces Key Laboratory of Materials PhysicsMinistry of Educationand School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China State Centre for International Cooperation on Designer Low-Carbon&Env.ronmental Materials and School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

The emergence of nov.l self-powered humidity sensors has attracted considerable attention in the fields of smart electronic dev.ces and personal ***,self-powered humidity sensors hav. been fabricated using a moisture-driv.n energy generation(MEG)dev.ce based on asymmetric tubular graphitic carbon nitride(g-CN)films prepared on anodized aluminum(AAO)*** a relativ. humidity(RH)of 96%,the MEG dev.ce can prov.de an open-circuit v.ltage of 0.47 v.and a short-circuit current of 3.51μA,with a maximum output power of 0.08μ*** inherent self-powered ability and humidity response v.a current v.riation,an extraordinary response of 1.78×106%(41%-96%RH)can be gained from the MEG *** possible power generation mechanism is that g-CN/AAO heterostructure can form ion gradient and diffusion under the action of moisture to conv.rt chemical potential into electrical potential,ev.king a connaturally sensitiv. response to ***-powered respiration monitoring dev.ce based on the sensor is designed to monitor human mov.ment(sitting,warming up,and running)and sleep status(normal,snoring,and apnea),maintaining excellent stability during cumulativ. 12-h respiration *** self-powered humidity sensing technology has promising potential for extensiv. integration into smart electronic and round-the-clock health monitoring dev.ces.

关键词： graphitic carbon nitride moisture-driv.n energy generation humidity sensor respiration monitoring

Fine mapping and characterization of a major QTL for grain length,***-2D.1,that has pleiotropic effects in synthetic allohexaploid wheat

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Journal of Integrativ. Agriculture 2024年第9期23卷 2911-2922页

作者： Mingming Wang Jia Geng Zhe Zhang Zihan Zhang Lingfeng Miao Tian Ma Jiewen Xing Baoyun Li Qixin Sun Yufeng Zhang Zhongfu ni Frontiers Science Center for Molecular Design Breeding/Key Laboratory of Crop Heterosis and Utilization Ministry of Education/Beijing Key Laboratory of Crop Genetic ImprovementChina Agricultural UniversityBeijing 100193China National Plant Gene Research Centre Beijing 100193China

Grain size is one of the determinants of grain yield,and identifying the genetic loci that control grain size will be helpful for increasing grain *** our prev.ous study,a quantitativ. trait locus(QTL)for grain length(GL),***-2D.1,was identified from an F2 population dev.loped from the cross between the natural(TAA10)and synthetic(XX329)allohexaploid *** the present study,we mainly fine mapped and v.lidated its genetic *** this end,multiple near-isogenic lines(niLs)were obtained through marker-assisted selection with TAA10 as the recurrent *** secondary populations deriv.d from 25 heterozygous recombinants were used for fine mapping of ***-2D.1,and the allele from XX329 significantly increased GL,thousand-grain weight(TGW),total spikelet number per spike(TSN)and spike compactness(SC).Using niLs for XX329(2D+)and TAA10(2D−),we determined the genetic and pleiotropic effects of *** target sequences were aligned with the wheat reference genome RefSeq v..1 and spanned an~0.9 Mb genomic ***2D03G0114900(ortholog of Os03g0594700)was predicted as the candidate gene based on whole-genome re-sequencing and expression *** summary,the map-based cloning of ***-2D.1 will be useful for improv.ng grain weight with enhanced GL and TSN.

关键词： grain length total spikelet number per spike spike compactness near-isogenic lines QTL wheat