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| 1 | Robust ionospheric clutter mitigation method for high frequency surface wave radar显示文摘This paper analyzes the characteristics of ionospheric clutter, which has proven to be the greatest impediment in high frequency surface wave radar (HFSWR). Iono-spheric clutter influences most range bins, all Doppler bins and beams, and exhib-its a high directivity. A robust adaptive side-lobe cancellation algorithm based on orthogonal auxiliary beams, which use the difference beams to estimate the iono-spheric clutter information, is introduced to suppress the ionospheric clutter. Training data was selected by excluding the sea clutter and probable target unit; and diagonal loading was added to enhance the robustness of the algorithm. Ex-perimental results demonstrate that the algorithm is able to suppress the iono-spheric clutter whilst preserving the desired characteristics of the target echoes and is suitable for practical implementation. | LI Lei XU RongQing LI GaoPeng | 2008 | Science in China(Series F)2008，51，12： | 1 |
| 2 | Understanding the dynamical-microphysical-electrical processes associated with severe thunderstorms over the Beijing metropolitan region显示文摘The Dynamical-microphysical-electrical Processes in Severe Thunderstorms and Lightning Hazards(STORM973)project conducted coordinated comprehensive field observations of thunderstorms in the Beijing metropolitan region(BMR)during the warm season from 2014 to 2018.The aim of the project was to understand how dynamical,microphysical and electrical processes interact in severe thunderstorms in the BMR,and how to assimilate lightning data in numerical weather prediction models to improve severe thunderstorm forecasts.The platforms used in the field campaign included the Beijing Lightning Network(BLNET,consisting of 16 stations),2 X-band dual linear polarimetric Doppler radars,and 4 laser raindrop spectrometers.The collaboration also made use of the China Meteorological Administration’s mesoscale meteorological observation network in the Beijing-Tianjin-Hebei region.Although diverse thunderstorm types were documented,it was found that squall lines and multicell storms were the two major categories of severe thunderstorms with frequent lightning activity and extreme rainfall or unexpected local short-duration heavy rainfall resulting in inundations in the central urban area,influenced by the terrain and environmental conditions.The flash density maximums were found in eastern Changping District,central and eastern Shunyi District,and the central urban area of Beijing,suggesting that the urban heat island effect has a crucial role in the intensification of thunderstorms over Beijing.In addition,the flash rate associated with super thunderstorms can reach hundreds of flashes per minute in the central city regions.The super(5%of the total),strong(35%),and weak(60%)thunderstorms contributed about 37%,56%,and 7%to the total flashes in the BMR,respectively.Owing to the close connection between lightning activity and the thermodynamic and microphysical characteristics of the thunderstorms,the lightning flash rate can be used as an indicator of severe weather events,such as hail and short-duration heavy rainfall.Lightning data can also be assimilated into numerical weather prediction models to help improve the forecasting of severe convection and precipitation at the cloud-resolved scale,through adjusting or correcting the thermodynamic and microphysical parameters of the model. | Xiushu QIE Shanfeng YUAN Zhixiong CHEN Dongfeng WANG Dongxia LIU Mengyu SUN Zhuling SUN Abhay SRIVASTAVA Hongbo ZHANG Jingyu LU Hui XIAO Yongheng BI Liang FENG Ye TIAN Yan XU Rubin JIANG Mingyuan LIU Xian XIAO Shu DUAN Debin SU Chengyun SUN Wenjing XU Yijun ZHANG Gaopeng LU Da-Lin ZHANG Yan YIN Ye YU | 2021 | Science China Earth Sciences2021，64，1： | 1 |
| 3 | Review on corrosion resistance of mild steels in liquid aluminum显示文摘The corrosion of mild steels by liquid aluminum is an intractable issue in aluminum industry.This review aims to provide an overview of the corrosion behavior of mild steels in the static liquid aluminum with an emphasis on the thermodynamic and kinetic aspects.The corrosion mechanisms of mild steels in liquid aluminum are discussed systematically,based on which four corrosion control approaches including alloying,introducing secondary phase,matrix microstructure control and surface treatment are introduced.Currently,a combination of improvement approaches may have a great potential for further enhancement in corrosion resistance. | Gaopeng Xu Kui Wang Xianping Dong Lei Yang Mahmoud Ebrahimi Haiyan Jiang Qudong Wang Wenjiang Ding | 2021 | Journal of Materials Science & Technology2021，，12： | 1 |
| 4 | Angle-frequency estimation using trilinear decompo- sition of the oversampled output显示文摘 | ZHANG Xiaofei FENG Gaopeng Xu Dazhuang | 2009 | Wireless Personal Communications2009，51，2： | 1 |
| 5 | The First Case of COVID-19 by an A.27 Lineage Variant Detected in a Returning Employee—Sichuan Province,China,January 7,2021显示文摘On January 7,2021,a 32-year-old returning employee arrived in Chengdu from Algeria via airplane and tested positive for coronavirus disease 2019(COVID-19)by nucleic acid tests.He was transferred to the designated hospital for further diagnosis and treatment.The patient was diagnosed as a mild COVID-19 case on January 16.After medical treatment,this patient recovered and left the hospital on February 18. | Li Liu Tao Luo Gaopeng Lei Yuliang Feng Xiang Zhao Huiping Yang Jianan Xu Ming Pan Linlin Zhou | 2021 | China CDC weekly2021，3，34： | 1 |
| 6 | Recent observations and research progresses of terrestrial gamma-ray flashes during thunderstorms显示文摘Terrestrial gamma-ray flashes(TGFs)are high-energy emissions in thunderstorms that were discovered first by satellite-based and then by ground-based gamma-ray detectors with photon energy up to tens of Me V.TGFs are a natural highenergy phenomenon associated with lightning discharges that frequently occur during thunderstorms.However,their production mechanisms and associated processes are still unclear.TGF studies have already been a research spotlight in the atmospheric electricity and high-energy atmosphere research areas.In this paper,we review recent research progresses on TGF studies in the past decade,including TGF detection,the relationship between TGFs and lightning processes,and thunderstorm activities.Several unsolved important scientific questions are discussed.Results suggest that upward TGFs observed by satellite-based detectors are closely connected with the development of in-cloud upward negative leaders.They are usually generated in milliseconds of the initiation of upward negative leaders and may produce a kind of distinct radio emissions because of the generation and propagation of huge amounts of high-energy electrons.By contrast,its counterpart,i.e.,downward TGFs observed by ground-based gamma-ray detectors,is associated with different types of lightning processes,such as downward negative or upward positive leaders,the initial continuing current stage of rocket-triggered lightning flashes return stroke processes.Because of limited observations,how these downward TGFs are generated is still unclear.Benefiting from the development of state-of-the-art instruments with high temporal and spatial resolutions,new insights into the processes and mechanisms of TGFs will be achieved with coordinated observations from satellite-based and ground-based measurements. | Fanchao LYU Yijun ZHANG Gaopeng LU Baoyou ZHU Hongbo ZHANG Wei XU Shaolin XIONG Weitao LYU | 2023 | Science China Earth Sciences2023，66，3： | 0 |
| 7 | Crafting of plasmonic Au nanoparticles coupled ultrathin BiOBr nanosheets heterostructure: steering charge transfer for efficient CO_(2) photoreduction显示文摘Integrating semiconductor photocatalysts with outstanding visible light absorption and fast surface/interface charge transfer kinetics is still an enormous challenge for efficient CO_(2)photoreduction.In this work,the Au nanoparticles have been coupled with ultrathin BiOBr nanosheets,the formed heterostructure(Au/BiOBr)pos-sesses a localized surface plasmon resonance(LSPR)and enhances the visible light absorption ability,as well as forms a fast charge transport channel on the interface between Au and BiOBr.Thus,the heterostructure photo-catalyst exhibits higher photocatalytic CO_(2)to CO performance(135.3/16.43μmol g^(-1))than that of BiOBr(89.0/6.46μmol g^(-1))under 300 W Xe lamp and visible light(λ>400 nm)irradiation for 5 h,respectively.Finally,the in situ FT-IR spectroscopy revealed CO_(2)photoreduction process and found that the*COOH is the key intermediate for CO_(2)to CO.This work provides an effective method to construct multielectron transfer scheme for efficient photocatalytic CO_(2)reduction. | Gaopeng Liu Lin Wang Xin Chen Xingwang Zhu Bin Wang Xinyuan Xu Ziran Chen Wenshuai Zhu Huaming Li Jiexiang Xia | 2022 | Green Chemical Engineering2022，3，2： | 0 |
| 8 | Advances in the Researches of the Middle and Upper Atmosphere in China in 2020-2022显示文摘This report reviews the researches for the middle and upper atmosphere in 2020-2022 by Chinese scientists.The report consists of five parts introducing primarily the results from the aspects of the development of infrastructure,the structure and composition,the climate and modeling,the dynamics for the middle and upper atmosphere,and Coupling between Stratosphere and Troposphere,respectively. | CHEN Zeyu XU Jiyao CHEN Hongbin CHEN Wen REN Rongcai HU Xiong ZHU Yajun XUE Xianghui LU Gaopeng ZHANG Shaodong HUANG Kaiming TIAN Wenshou ZHANG Jiankai HU Dingzhu RAO Jian HU Yongyun XIA Yan | 2022 | 空间科学学报2022，42，4： | 0 |
| 9 | D-π-D molecular layer electronically bridges the NiO_(x) hole transport layer and the perovskite layer towards high performance photovoltaics显示文摘Nickel oxide (NiO_(x)) has significant cost and stability advantages over poly[bis (4-phenyl)(2,4,6-trimethyl phenyl)amine](PTAA) for inverted p-i-n perovskite solar cells (PSCs),but the poor NiO_(x)/perovskite contact stemming from some reactive species at the interface led to suboptimal device performance.To solve this problem,we take a multiple donor molecule approach,using 3,3’-(4,8-bis(hexylthio)benzo[1,2-b:4,5-b’]dithiophene-2,6-diyl)bis(10-(6-bromohexyl)-10H-phenoxazine)(BDT-POZ) as an example,to modify the NiO_(x)/perovskite interface.The primary goal was to reduce the under-coordinated Ni^(≥3+) cations via electron transfer from the donor molecules to NiO_(x),thus mitigating the detrimental reactions between perovskite and NiO_(x).Equally importantly,the hole extraction at the interface was greatly enhanced after the organic donor modification,since the hydrophobic species atop NiO_(x) not only enabled pinhole-free crystallization of the perovskite but also properly tuned the interfacial energy level alignment.Consequently,the PSCs with NiO_(x)/BDT-POZ HTL achieved a high power conversion efficiency (PCE) up to 20.16%,which compared excellently with that of the non-modified devices (17.83%).This work provides a new strategy to tackle the exacting issues that have so far impeded the development of NiO_(x) based PSCs. | Rongguo Xu Xiuwen Xu Ruixi Luo Yu Li Gaopeng Wang Tongfa Liu Ning Cai Shihe Yang | 2022 | Journal of Energy Chemistry2022，31，4： | 0 |
| 10 | Oxygen defect modulating the charge behavior in titanium dioxide for boosting photocatalytic nitrogen fixation performance显示文摘Extremely high-temperature and high-pressure requirement of Haber-Bosch process motivates the search for a sustainable ammonia synthesis approach under mild conditions.Photocatalytic technology is a potential solution to convert N2 to ammonia.However,the poor light absorption and low charge carrier separation efficiency in conventional semiconductors are bottlenecks for the application of this technology.Herein,a facile synthesis of anatase TiO_(2)nanosheets with an abundance of surface oxygen vacancies(TiO_(2)-OV)via the calcination treatment was reported.Photocatalytic experiments of the prepared anatase TiO_(2)samples showed that TiO_(2)-OV nanosheets exhibited remarkably increased ammonia yield for solar-driven N2 fixation in pure water,without adding any sacrificial agents.EPR,XPS,XRD,UV-Vis DRS,TEM,Raman,and PL techniques were employed to systematically explore the possible enhanced mechanism.Studies revealed that the introduced surface oxygen vacancies significantly extended the light absorption capability in the visible region,decreased the adsorption and activation barriers of inert N2,and improved the separation and transfer efficiency of the photogenerated electronhole pairs.Thus,a high rate of ammonia evolution in TiO_(2)-OV was realized.This work offers a promising and sustainable approach for the efficient artificial photosynthesis of ammonia. | Mengxia Ji Nianhua Liu Kai Li Qing Xu Gaopeng Liu Bin Wang Jun Di Huaming Li Jiexiang Xia | 2023 | Materials Reports(Energy)2023，3，4： | 0 |
| 11 | Advances in the Researches of the Middle and Upper Atmosphere in China显示文摘In this paper we summarize the research results by Chinese scientists in 2016–2018. The focuses are placed on the researches of the middle and upper atmosphere, specifically the researches associated with groundbased observation capability development, dynamical processes, and properties of circulation and chemistryclimate coupling of the middle atmospheric layers. | CHEN Zeyu CHEN Hongbin XU Jiyao L Daren ZHANG Shaodong XUE Xianghui TIAN Wenshou LIU Renqiang CHEN Wen HU Yongyun WANG Rui HU Dingzhu HU Xiong YANG Guotao GONG Yun LU Gaopeng | 2018 | 空间科学学报2018，38，5： | 0 |
| 12 | Effective inhibition of anomalous grain coarsening in cast AZ91 alloys during fast cooling via nanoparticle addition显示文摘In this work, the effects of Ti CN and γ-Al_(2)O_(3) nanoparticle(NP) addition on the microstructural evolution of cast AZ91 alloys at the cooling rate ranging from 15 to 120 K/s have been systematically investigated. Experimental results reveal that grain coarsening occurs in cast AZ91 alloys when the cooling rate exceeds 90 K/s, while it can be effectively inhibited upon addition of NPs. The marked inhibition effect may originate from the formation of Ti CN or γ-Al_(2)O_(3) NP-induced undercooling zone ahead of solid/liquid(S/L) front of α-Mg, which not only can restrict grain growth effectively, but also can reactivate the native nucleants that are inactive in AZ91 melts to participate in nucleation events. And if possessing high nucleation potency, NPs can also promote further nucleation events and lead to significant grain refinement. An analytical model has been established to quantitatively account for the restriction effect of NPs on grain growth. The present work may shed a new light on the grain coarsening of cast alloys during fast cooling and provide an effective approach to circumvent it. | Haonan Li Kui Wang Gaopeng Xu Haiyan Jiang Qudong Wang Yingxin Wang | 2023 | Journal of Magnesium and Alloys2023，11，12： | 0 |
| 13 | Microstructure design of advanced magnesium-air battery anodes显示文摘Metal-air battery is an environmental friendly energy storage system with unique open structure.Magnesium(Mg)and its alloys have been extensively attempted as anodes for air batteries due to high theoretical energy density,low cost,and recyclability.However,the study on Mg-air battery(MAB)is still at the laboratory level currently,mainly owing to the low anodic efficiency caused by the poor corrosion resistance.In order to reduce corrosion losses and achieve optimal utilization efficiency of Mg anode,the design strategies are reviewed from microstructure perspectives.Firstly,the corrosion behaviors have been discussed,especially the negative difference effect derived by hydrogen evolution.Special attention is given to the effect of anode micro-structures on the MAB,which includes grain size,grain orientation,second phases,crystal structure,twins,and dislocations.For further improvement,the discharge performance,long period stacking ordered phase and its enhancing effect are considered.Meanwhile,given the current debates over Mg dendrites,the potential risk,the impact on discharge,and the elimination strategies are discussed.Microstructure control and single crystal would be promising ways for MAB anode. | Xu Huang Qingwei Dai Qing Xiang Na Yang Gaopeng Zhang Ao Shen Wanming Li | 2024 | Journal of Magnesium and Alloys2024，12，2： | 0 |
| 14 | A highly sensitive breathable fuel cell gas sensor with nanocomposite solid electrolyte显示文摘The present work deals with a poly(vinyl alcohol)-based membrane mixed with poly(4-styrenesulfonic acid)to be used as a proton-conducting solid-state electrolyte in an electrochemical gas sensor for the detection of alcohol.A cross-linking bonding semi-interpenetrating network is formed between the polymer backbones,providing the membrane with superior mechanical property and excellent water retention.Meanwhile,the graphene oxide nanosheets are incorporated into the polymer fibrous backbones,creating impermeable block layers to limit ethanol gas penetration.Importantly,the modification of graphene oxide facilitates the protons transportation in both in-plane and through-plane channels of the membrane,boosting excellent conductivities of 0.13 S cm^−1(in-plane)and 22.6 mS cm^−1(through-plane)at 75C,respectively.An alcohol fuel cell sensor assembled with this semi-interpenetrating network solid electrolyte membrane is fabricated based on direct ethanol fuel cell principle,exhibiting excellent sensitivity,linearity,as well as low ethanol detection limits of 25 ppm. | Jing Zhang Gaopeng Jiang Timothy Cumberland Pan Xu Yalin Wu Stephen Delaat Aiping Yu Zhongwei Chen | 2019 | InfoMat2019，1，2： | 0 |
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