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High performance receiving and processing technology in satellite beam hopping communication

Journal of Systems Engineering and Electronics 2024年第4期35卷 815-828页

作者： ZHAI Shenghua HUI Tengfei GONG Xianfeng ZHANG Zehui GAO Xiaozheng yANG Kai School of Communication Engineering Xi’Dian UniversityXian 710126China CAST(China Academy of Space Technology)-Xi’an institute of Space Radio Technology Xi’an 710010China School of Cyberspace Science and Technology Beijing Institute of TechnologyBeijing 100081China School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China

Beam-hopping technology has become one of the major research hotspots for satellite communication in order to enhance their communication capacity and ***,beam hopping causes the traditional continuous time-division multiplexing signal in the forward downlink to become a burst signal,satellite terminal receivers need to solve multiple key issues such as burst signal rapid synchronization and high-per-formance ***,this paper analyzes the key issues of burst communication for traffic signals in beam hopping sys-tems,and then compares and studies typical carrier synchro-nization algorithms for burst ***,combining the requirements of beam-hopping communication systems for effi-cient burst and low signal-to-noise ratio reception of downlink signals in forward links,a decoding assisted bidirectional vari-able parameter iterative carrier synchronization technique is pro-posed,which introduces the idea of iterative processing into car-rier *** at the technical characteristics of communication signal carrier synchronization,a new technical approach of bidirectional variable parameter iteration is adopted,breaking through the traditional understanding that loop struc-tures cannot adapt to low signal-to-noise ratio burst ***,combining the DVB-S2X standard physical layer frame format used in high throughput satellite communication systems,the research and performance simulation are *** results show that the new technology proposed in this paper can significantly shorten the carrier synchronization time of burst signals,achieve fast synchronization of low signal-to-noise ratio burst signals,and have the unique advantage of flexible and adjustable parameters.

关键词： beam-hopping high throughput satellite high per-formance reception processing

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Analysis of faulting destruction and water supply pipeline damage from the first mainshock of the February 6,2023 Türkiye earthquake doublet

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Earthquake Science 2024年第1期37卷 78-90页

作者： Xiaoqing Fan Libao Zhang Juke Wang yefei Ren Aiwen Liu institute of Geophysics China Earthquake AdministrationBeijing 100081China institute of Engineering Mechanics China Earthquake AdministrationHarbin 150080China

In 2023,two consecutive earthquakes exceeding a magnitude of 7 occurred in Türkiye,causing severe casualties and economic *** damage to critical urban infrastructure and building structures,including highways,railroads,and water supply pipelines,was particularly severe in areas where these structures intersected the seismogenic *** infrastructure projects that traverse active faults are susceptible to the influence of fault movement,pulse velocity,and ground *** this study,we used a unique approach to analyze the acceleration records obtained from the seismic station array(9 strong ground motion stations)located along the East Anatolian Fault(the seismogenic fault of the MW7.8 mainshock of the 2023 Türkiye earthquake doublet).The acceleration records were filtered and integrated to obtain the velocity and displacement time *** used the results of an on-site investigation,jointly conducted by China Earthquake Administration and Türkiye’s AFAD,to analyze the distribution of PGA,PGV,and PGD recorded by the strong motion array of the East Anatolian *** found that the maximum horizontal PGA in this earthquake was 3.0 g,and the maximum co-seismic surface displacement caused by the East Anatolian Fault rupture was 6.50 *** the fault rupture propagated southwest,the velocity pulse caused by the directional effect of the rupture increased gradually,with the maximum PGA reaching 162.3 cm/*** also discussed the seismic safety of critical infrastructure projects traversing active faults,using two case studies of water supply pipelines in Türkiye that were damaged by *** used a three-dimensional finite element model of the PE(polyethylene)water pipeline at the Islahiye State Hospital and fault displacement observations obtained through on-site investigation to analyze pipeline failure *** further investigated the effect of the fault-crossing angle on seismic safety of a pipeline,based on our analysis and the failure p

关键词： Türkiye earthquake fault displacement near-fault ground motion velocity pulse water supply pipeline

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Metrology for sub-Rayleigh-length target positioning in~10^(22)W/cm^(2)laser-plasma experiments

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High Power Laser Science and Engineering 2024年第3期12卷 90-105页

作者： E.A.Vishnyakov A.Sagisaka K.Ogura T.Zh.Esirkepov B.Gonzalez-Izquierdo C.D.Armstrong T.A.Pikuz S.A.Pikuz W.yan T.M.Jeong S.Singh P.Hadjisolomou O.Finke G.M.Grittani M.Nevrkla C.M.Lazzarini A.Velyhan T.Hayakawa y.Fukuda J.K.Koga M.Ishino K.Kondo y.Miyasaka A.Kon M.Nishikino y.V.Nosach D.Khikhlukha I.P.Tsygvintsev D.Kumar J.Nejdl D.Margarone P.V.Sasorov S.Weber M.Kando H.Kiriyama y.Kato G.Korn K.Kondo S.V.Bulanov T.Kawachi A.S.Pirozhkov ELI Beamlines Facility The Extreme Light Infrastructure ERICDolníBrežanyCzech Republic Kansai institute for Photon Science(KPSI) QSTKyotoJapan Central Laser Facility Rutherford Appleton LaboratorySTFCHarwell OxfordDidcotUK institute for Open and Transdisciplinary Research Initiatives Osaka UniversityOsakaJapan HB11 Energy Holdings FreshwaterAustralia Key Laboratory for Laser Plasmas(Ministry of Education) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghaiChina Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghaiChina institute of Plasma Physics ASCR PragueCzech Republic FZU-institute of Physics ASCR PragueCzech Republic Czech Technical University in Prague FNSPEPragueCzech Republic institute of Laser Engineering Osaka UniversityOsakaJapan institute of Physics National Academy of Sciences of UkraineKyivUkraine ISTEQ AR YerevanArmenia

Tight focusing with very small f-numbers is necessary to achieve the highest at-focus ***,tight focusing imposes strong demands on precise target positioning in-focus to achieve the highest on-target irradiance We describe several near-infrared,visible,ultraviolet and soft and hard X-ray diagnostics employed in a~10^(22)W/cm^(2)laser±plasma *** used nearly 10 J total energy femtosecond laser pulses focused into an approximately1.3-μm focal spot on 5±20μm thick stainless-steel *** discuss the applicability of these diagnostics to determine the best in-focus target position with approximately 5μm accuracy(i.e.,around half of the short Rayleigh length)and show that several diagnostics(in particular,3ωreflection and on-axis hard X-rays)can ensure this *** demonstrated target positioning within several micrometers from the focus,ensuring over 80%of the ideal peak laser intensity *** approach is relatively fast(it requires 10±20 laser shots)and does not rely on the coincidence of low-power and high-power focal planes.

关键词： laser-plasma interaction precise target positioning spectroscopy ultra-high intensity X-rays

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Manipulating the Macroscopic and Microscopic Morphology of Large-Area Gravure-Printed ZnO Films for High-Performance Flexible Organic Solar Cells

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Energy & Environmental Materials 2024年第2期7卷 229-239页

作者： Zhenguo Wang Jingbo Guo yaqin Pan Jin Fang Chao Gong Lixin Mo Qun Luo Jian Lin Changqi Ma School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China i-Lab&Printable Electronics Research Center Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of Sciences(CAS)Suzhou 215123China Beijing Engineering Research Center of Printed Electronics Beijing Institute of Graphic CommunicationBeijing 102600China Jiangxi institute of Nanotechnology Chinese Academy of Sciences(CAS)Nanchang 330200China

Gravure printing is a promising large-scale fabrication method for flexible organic solar cells(FOSCs)because it is compatible with two-dimension patternable roll-to-roll ***,the unsuitable rheological property of ZnO nanoinks resulted in unevenness and looseness of the gravure-printed ZnO interfacial *** we propose a strategy to manipulate the macroscopic and microscopic of the gravure-printed ZnO films through using mixed solvent and poly(vinylpyrrolidone)(PVP)*** regulation of drying speed effectively manipulates the droplets fusion and leveling process and eliminates the printing ribbing structure in the macroscopic *** additive of PVP effectively regulates the rheological property and improves the microscopic compactness of the *** this method,large-area ZnO∶PVP films(28×9 cm^(2))with excellent uniformity,compactness,conductivity,and bending durability were *** power conversion efficiencies of FOSCs with gravure-printed AgNWs and ZnO∶PVP films reached 14.34%and 17.07%for the 1 cm^(2)PM6:y6 and PM6∶L8-BO flexible *** efficiency of 17.07%is the highest value to date for the 1 cm^(2)*** use of mixed solvent and PVP addition also significantly enlarged the printing window of ZnO ink,ensuring high-quality printed thin films with thicknesses varying from 30 to 100 nm.

关键词： flexible organic solar cell gravure printing large-area flexible interfacial layer rheology properties zinc oxide

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Total Synthesis of Laurane and Guaiane Sesquiterpenoids via Oxidative Nazarov Reaction

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Chinese Journal of Chemistry 2024年第11期42卷 1267-1274页

作者： yuye Chen Wenqing Chen Zhiting Zhang Jing Xu Shenzhen Grubbs institute and Department of Chemistry and Guangming Advanced Research institute and Guangdong Provincial Key Laboratory of Catalysis and Shenzhen Key Laboratory of Small Molecule Drug Discovery and Synthesis Southern University of Science and TechnologyShenzhenGuangdong518055 China

As one of the most common structural motifs in natural products,cyclopentenones usually can be fabricated by Nazarov cyclization using divinyl ketones or functionalized tertiary divinyl carbinols(TDCs)as ***,straightforward method for transforming unfunctionalized TDCs to their corresponding cyclopentenones is currently ***,we wish to report the total syntheses of four structurally distinct terpenoids,namely laurane-type marine sesquiterpenoids isolaurene,debromoaplysin and aplysin,and guaiane sesquiterpenoid guaiadienone A,all using a novel synthetic method,named oxidative Nazarov cyclization,as the key *** work demonstrated our robust method is suitable for synthesizing various highly substituted cyclopentenones.

关键词： Total synthesis Synthetic methods Sesquiterpenoids Oxidative Nazarov reaction Electrocyclization Oxoammonium salt Pericyclic reaction Annulation

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Measures of Relative and Absolute Convergence and Pro-poor Growth with an Illustration based on China(2010–2018)

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China & World Economy 2024年第2期32卷 1-41页

作者： Elena Bárcena-Martin Jacques Silber yuan Zhang Facultad de Ciencias Económicas y Empresariales Universidad de MálagaSpain Department of Economics Bar-Ilan UniversityIsrael China Center for Economic Studies Fudan UniversityChina

Income mobility is a key issue for understanding the process of economic growth and distributional *** economists have used the concept of“pro-poor growth”to examine,with individual-level panel data,whether the poor benefit more than the rich from economic growth by tracking the extent of income mobility among different population *** is also literature in macroeconomics on the measurement of *** paper introduces population-weighted relative and absolute indices of mobility,convergence,and pro-poor growth;it also distinguishes between anonymous and nonanonymous approaches to these *** empirical analysis is based on Chinese panel data for the period 2010–*** both absolute and relative terms,income growth in China was greater for individuals with an initially lower income but only for lower income deciles in relative *** was also an overall increase in individual welfare from anonymous and nonanonymous perspectives,which was higher among younger *** welfare of the poor did not increase more than that of the *** results shed light on the evolution of income distribution in China during the past decade's rapid economic growth.

关键词： anonymous and nonanonymous approach convergence exchange and structural mobility pro-poor growth

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Diversification of interfaces triggered hydrogen storage properties enhancement

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Rare Metals 2024年第5期43卷 2324-2330页

作者： Jia-Xin Zhang Xin Ding Rui-Run Chen Xiang-Feng Ma Wen-Chao Cao yong Zhang Jing-Jie Guo National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China

Dual effects of grain refinement and alloying are achieved and the mechanism of"diverse interfaces reinforcement"for hydrogen storage Mg alloys is first *** interface reinforced Mg-y-Zn-Al alloy for hydrogen storage is *** work figures out that the adventurous Al-rich phase exhibits an ordered face-centered cubic(FCC)structure with composition of(31±2)at%y-(28±1)at%Zn-(41±3)at%Al,i.e.,y_(3)Zn_(3)Al_(4),and an incoherent interface between y3Zn3Al4phase and Mg substrate is observed.

关键词： hydrogen alloying alloy

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Petrogenesis of Oligocene Granitoids and its Implications on Beryllium Mineralization at Pagele, Nianqingtanggula Mountain(Central Tibet)

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Acta Geologica Sinica(English Edition) 2024年第5期98卷 1202-1225页

作者： ZHANG Linyuan yANG Zhusen HOU Zengqian WU Changda LIU Chang XU Peiyan XIE Lankui institute of Geology Chinese Academy of Geological Sciences School of Earth and Space Sciences Peking University institute of Mineral Resources Chinese Academy of Geological Sciences School of Earth Sciences and Resources China University of Geosciences institute of Geology and Mineral Resources Chengdu Center China Geological Survey

The newly discovered Oligocene granitoids（33.1–28.7 Ma） at Pagele are magmatic rocks related to beryllium mineralization during the India–Asia late-collisional stage. This discovery provides an ideal example to study the latecollisional orogeny and beryllium prospecting in the Lhasa terrane. The Oligocene granitoids include porphyritic granodiorite, Stage Ⅰ, Ⅱ and Ⅲ granites, and granitic pegmatite. Geochemical analysis shows that the porphyritic granodiorite is characterized by high SiO2, K2O, total ΣREE contents, and（La/yb）N ratios; while the latter two by higher SiO2, lower ΣREE and（La/yb）N ratios. Notably, the granitic pegmatite has extremely high y/Ho, low K/Rb and Zr/Hf, and distinct REE tetrad effect（1.14–1.21）. This study suggests that the porphyritic granodiorite may be derived from partial melting of beryllium-rich materials composed of Lhasa ancient crust（70%–80%） and enriched Lhasa lithospheric mantle（20%–30%） under the tearing subduction of Indian slab. The three-stage granites and granitic pegmatite, which contain higher beryllium contents or beryls, were likely generated by highly fractionation of the porphyritic granodioritic magma or other homologous magma. Considering the possible genetic and spatial link between Indian slab tear and rifts, we suggest that highly-fractionated granites in rifting systems represent important Be prospecting targets in the Lhasa terrane.

关键词： beryllium mineralization central Lhasa subterrane enriched Lhasa lithospheric mantle Lhasa ancient crust Oligocene granitoids

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Structural insights into AtABCG25,an angiosperm-specific abscisic acid exporter

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Plant Communications 2024年第1期5卷 284-295页

作者： Jian Xin yeling Zhou yichun Qiu He Geng yuzhu Wang yi Song Jiansheng Liang Kaige yan Department of Chemical Biology School of Life SciencesSouthern University of Science and TechnologyShenzhen 518055China institute of Plant and Food Science Department of BiologySchool of Life SciencesSouthern University of Science and TechnologyShenzhen 518055China Max Planck institute of Molecular Plant Physiology Potsdam-GolmGermany institute for Biological Electron Microscopy Southern University of Science and TechnologyShenzhenGuangdongChina

Cellular hormone homeostasis is essential for precise spatial and temporal signaling responses and *** acid(ABA)plays pivotal roles in orchestrating various developmental and stress re-sponses and confersfitness benefits over ecological and evolutionary timescales in terrestrial *** ABA level is regulated by complex processes,including biosynthesis,catabolism,and ***25 is thefirst ABA exporter identified through genetic screening and affects diverse ABA *** the structural basis of ABA export by ABCG25 is critical for further manipulations of ABA homeostasis and *** used cryo-electron microscopy to elucidate the structural dynamics of AtABCG25 and successfully characterized different states,including apo AtABCG25,ABA-bound AtABCG25,and ATP-bound AtABCG25(E232Q).Notably,AtABCG25 forms a homodimer that fea-tures a deep,slit-like cavity in the transmembrane domain,and we precisely characterized the critical residues in the cavity where ABA *** binding triggers closure of the nucleotide-binding domains and conformational transitions in the transmembrane *** show that AtABCG25 belongs to a conserved ABCG subfamily that originated during the evolution of *** subfamily neofunctionalized to regulate seed germination via the endosperm,in concert with the evolution of this angio-sperm-specific,embryo-nourishing ***,thesefindings provide valuable insights into the intricate substrate recognition and transport mechanisms of the ABA exporter AtABCG25,paving the way for genetic manipulation of ABA homeostasis and plantfitness.

关键词： AtABCG25 abscisic acid ABC transporters cryo-EM structure

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Evaluation of temperature dependent vortex pinning properties in strongly pinned yBa_(2)Cu_(3)O_(7-δ)thin films with y_(2)BaCuO_(5)nanoinclusions

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Superconductivity 2024年第1期9卷 95-105页

作者： Alok K.Jha Kaname Matsumoto Tomoya Horide Shrikant Saini Ataru Ichinose Paolo Mele yutaka yoshida Satoshi Awaji Department of Materials Science and Engineering Kyushu Institute of TechnologyTobata-kuKitakyushu 804-8550Japan Department of Mechanical and Control Engineering Kyushu Institute of TechnologyTobata-kuKitakyushu 804-8550Japan Central Research institute of Electrical Power Industry YokosukaKanagawa 240-0196Japan College of Engineering-Innovative Global Program Shibaura Institute of TechnologyMinuma-kuSaitama 337-8570Japan Department of Energy Engineering and Science Nagoya UniversityChikusa-kuNagoya 464-8603Japan institute for Materials Research Tohoku UniversityAoba-kuSendai 980-8577Japan

The pinning of quantized magnetic vortices in superconducting yBa_(2)Cu_(3)O_(7-δ)(yBCO or y123)thin films with y_(2)BaCuO_(5)(y211)nanoinclusions have been investigated over wide temperature range(4.2-77 K).The concentration of y211 nanoinclusions has been systematically varied inside yBCO thin films prepared by laser ablation technique using surface modified target *** pinning force density values(Fp∼0.5 TNm^(−3)at 4.2 K,9 T)have been observed for the yBCO film with moderate concentration of y211 nanoinclusions(3.6 area%on ablation target).In addition,uniform enhancement in critical current density(J_(c))was observed in the angular dependent J_(c)measurement of yBCO+y211 nanocomposite films.y211 nanoinclusions have been found to be very efficient in pinning the quantized vortices thereby enhancing the in‐field J_(c)values over a wide range of *** the concentration of y211 secondary phase into y123 film matrix results into agglomeration of y211 phase and observed as increased y211 nanoparticle *** larger secondary phase nanoparticles are not as efficient pinning centers at lower temperatures as they are at higher temperatures due to substantial reduction of the coherence length at lower *** of the temperature dependence of J_(c)for yBCO+y211 nanocomposite films has been conducted and possible vortex pinning mechanism in these nanocomposite films has been discussed.

关键词： yBCO thin film Critical current Vortex pinning Nanoscale APCs

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