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Fabricating bio-inspired high impact resistance carbon nanotube network films for multi-protection under an extreme environment

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Nano Research 2024年第9期17卷 7793-7802页

作者： Mingquan Zhu Kailu Xiao Wei zhang Xudong {1. Yunxiang Bai Shijun {2. Peng zhang Feng Gao Congying {2. Wenqiang Xu Huiyong Li Xianqian Wu Chao {2. Hui zhang Luqi Liu Zhong zhang CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of chinese academy of sciences Beijing 100049China Department of Materials Science and Engineering Texas A&M UniversityCollege StationTexas 77840USA institute of {1. Chinese Academy of SciencesBeijing 100190China School of Astronautics Harbin Institute of TechnologyHarbin150001China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027China

The fabrication of light-weight,highly impact-resistant,and energy-absorbent materials is urgently demanded in many facets of the society from body armor to aerospace engineering,especially under an extreme *** nanotubes(CNTs),one of the strongest and toughest materials ever found,also have good conductivity,chemical stability,and thermal stability,etc,making them a competitive candidate as building blocks to help achieve the above *** this work,a kind of CNT network was prepared by using chlorosulfonic acid(CSA)to release the internal stress of super-aligned carbon nanotube films(SA-CNTF)and dendritic polyamide amine(PAMAM)to further introduce multiple hydrogen bonds and interlocking *** fabricated bioinspired carbon nanotube network films(PAMAM@C-CNTF)have a high toughness of 45.97 MJ/m3,showing an increase of 42.%compared to neat *** importantly,the anti-impact performance of the films(e.g.,with a maximum specific energy absorption of 1.40 MJ/kg under 80-1.0 m/s projectile impact)is superior to that of conventional protective materials from steel and Kevlar fiber,and also exceeds that of any other reported carbon-based *** hierarchical energy dissipation mechanism was further revealed through experiment and *** functions including intelligent heating/anti-icing,ultraviolet protection,as well as electromagnetic interference shielding properties make these network films have great potential in practical multi-protection applications,especially under an extreme environment.

关键词： carbon nanotubes composites mechanical properties multi-function

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Development and evaluation of an online monitoring single-particle optical particle counter with polarization detection

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Journal of Environmental sciences 2024年第4期138卷 585-596页

作者： Weijie Yao Xiaole Pan Yu Tian Hang Liu Yuting zhang Shandong {1. Junbo zhang Yinzhou zhang LinWu Yele Sun Zifa wang State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary sciences University of Chinese Academy of SciencesBeijing 100049China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China

We developed a single-particle optical particle counter with polarization detection(SOPC)for the real-time measurement of the optical size and depolarization ratio(defined as the ratio of the vertical component to the parallel component of backward scattering)of atmospheric particles,the polarization ratio(DR)value can reflect the irregularity of the *** SOPC can detect aerosol particles with size larger than 500 nm and the maximum particle count rate reaches~1.8×1.^(5)particles per *** SOPC uses a modulated polarization laser to measure the optical size of particles according to forward scattering signal and the DR value of the particles by backward S and P signal *** sampling rate of the SOPC was 1.6#/(sec·channel),and all the raw data were processed *** calibration curve was obtained by polystyrene latex spheres with sizes of 0.5-1.μm,and the average relative deviation of measurement was 3.96% for sub 3μm particles.T-matrix method calculations showed that the DR value of backscatter light at 1.0}°could describe the variations in the aspect ratio of particles in the above size *** performed insitu observations for the evaluation of the SOPC,the mass concentration constructed by the SOPC showed good agreement with the PM_(2.5)measurements in a nearby state-controlled monitoring *** instrument could provide useful data for source appointment and regulations against air pollution.

关键词： Instrument development Single particle detection Measurement uncertainty Optical simulation Mass concentration

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Novel Fe-based amorphous magnetic powder cores with ultra-low core losses

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Science china(Technological {1.) 2010年第5期53卷 1290-1293页

作者： zhang liang1,2.LI DeRen1,2.LU ZhiChao1,2.LU CaoWei1,2.LIU TianCheng1,2.GUO Feng2.LIU KaiHuang1,{2. Jun 2.& ZHOU ShaoXiong1,2.1 Central Iron and Steel Research institute,beijing 100081,china 2.Advanced Technology and Materials Co.,Ltd.,beijing 100081,china 1. Central Iron and Steel Research institute Beijing 100081 China2. Advanced Technology and Materials Co. Ltd. Beijing 100081 China

Amorphous magnetic alloy powders were prepared from bulk metallic glasses Fe74Cr2.o2.n2.1.Si4B4C2.with supercooled liq-uid region of 32.K by water *** magnetic powder core precursor was produced from a mixture of the amorphous alloy powder with addition of insulation and bonding materials by mold compacting at room *** annealing the core precursor,the amorphous magnetic core exhibits superior magnetic properties as compared with molypermalloy powder *** initial permeability up to 1.MHz was about 80,the flux density at 300 Oe was 1.06 T and the core loss at 1.0 kHz for Bm=0.1.T was only 32. kW/*** ultra-low core loss is attributed to the combination of relatively high resistivity and the amorphous structure of the Fe-based amorphous *** the outstanding magnetic properties,the Fe-based amorphous magnetic powder core had a much lower cost which renders the powder cores a potential candidate for a variety of industrial applications.

关键词： Fe-based amorphous powder water atomization amorphous powder core ultra-low core loss

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Curve fitting and optimal interpolation on CNC machines based on quadratic B-splines

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Science china(Information {1.) 2011年第7期54卷 1407-1418页

作者： zhang Mei 1,YAN Wei 2.YUAN ChunMing 1,wang DingKang 1 & GAO XiaoShan 1 1 Key Laboratory of Mathematics Mechanization,{2. of Mathematics and Systems Science,chinese {2. of sciences,beijing 100190,china 2.Research institute of Petroleum Exploration and Development,beijing 100083,china 1. Key Laboratory of Mathematics Mechanization Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China2. Research Institute of Petroleum Exploration and Development Beijing 100083 China

In this paper,curve fitting of 3-D points generated by G01.codes and interpolation based on quadratic B-splines are *** points of G01.codes are selected using an adaptive ***,quadratic B-splines are obtained as the fitting curve by interpolating these feature *** required in implementing the velocity planning algorithm mentioned by Timer et *** very complicated because of the appearance of high-order *** improved time-optimal method for the quadratic B-spline curves is presented to circumvent this *** algorithms are verified with simulations as well as on real CNC machines.

关键词： quadratic B-spline G01.codes feature point velocity planning interpolation

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Relative position determination of a lunar rover using high-accuracy multi-frequency same-beam VLBI

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Science china(Physics,{1. & Astronomy) 2010年第3期53卷 571-578页

作者： LIU QingHui1, CHEN Ming1, XIONG WeiMing2. QIAN ZhiHan1, LI JinLing1, HAO wangHong1,4, wang GuangLi1, ZHENG WeiMin1, GUAN Di3, ZHU RenJie1, wang WeiHua1, zhang XiuZhong1, JIANG DongRong1, SHU FengChun1, PING JinSong1 & HONG XiaoYu11 Shanghai Astronomical Observatory, chinese academy of sciences, Shanghai 2.0030, china 2.Center for Space Science and Applied Research, chinese academy of sciences, beijing 100190, china 3 Lunar Explorer Engineering General Department, chinese academy of sciences, beijing 100012. china 4 beijing institute of Tracking and Telecommunications Technology, beijing 100094, china 1. Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China2. Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100190 China4. Beijing Institute of Tracking and Telecommunications Technology Beijing 100094 China3. Lunar Explorer Engineering General Department Chinese Academy of Sciences Beijing 100012 China

Multi-frequency same-beam VLBI means that two explorers with a small separation angle are simultaneously observed with the main beam of receiving antennas. In the same-beam VLBI, the differential phase delay between two explorers and two receiving telescopes can be obtained with a small error of several picoseconds. The differential phase delay, as the observable of the same-beam VLBI, gives the separation angular information of the two explorers in the celestial sphere. The two-dimensional relative position on the plane-of-sky can thus be precisely determined with an error of less than 1.m for a distance of 3.8×1.5 km far away from the earth, by using the differential phase delay obtained with the four chinese VLBI stations. The relative position of a lunar rover on the lunar surface can be determined with an error of 1. m by using the differential phase delay data and the range data for the lander when the lunar topography near the rover and the lander can be determined with an error of 1. m.

关键词： same-beam VLBI differential phase delay relative position determination lunar rover

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Exploring formation mechanism and source attribution of ozone during the 2.1. Wuhan Military World Games:Implications for ozone control strategies

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Journal of Environmental sciences 2024年第2期136卷 400-411页

作者： lei {1. Lili {2. Runyu {2. Nan Chen Yuan Yang Ke Li Jie Sun Dan Yao Yuesi {2. Minghui Tao Yang Sun institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China University of the chinese academy of sciences Beijing 100049China Hubei Ecological Environment Monitoring Center Station Wuhan 430072China Guizhou Research and Designing institute of Environmental {1. Guizhou Academy of Environmental Science and DesignGuiyang 550081China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China School of Environment Key Laboratory for Yellow River and Huai River Water Environment and Pollution ControlMinistry of EducationHenan Normal UniversityXinxiang 453007China Key Laboratory of Regional Ecology and Environmental Change School of Geography and Information EngineeringChina University of GeosciencesWuhan 430074China

A series of emission reduction measures were conducted in Wuhan,Central china,to ensure good air quality during the 7th Military World Games(MWG)in October *** better understand the implications for ozone(O_(3))pollution control strategies,we applied integrated analysis approaches based on the de-weathered statistical model,parameterization methods,chemical box model,and positive matrix factorization *** the MWG,concentrations of O_(3),NO_x,and volatile organic compound(VOCs),OFP(O_(3)formation potential),L_(OH)(OH radical loss rate)were 83μg/m^(3),43μg/m^(3),{1. ppbv,1.8μg/m^(3),and 3.9 s^(-1.,respectively,which were {1.%,1.%,3%,1.%,and 1.%lower than pre-MWG values and 6%,39%,30%,33%,and 50%lower than post-MWG values,*** removing meteorological influence,O_(3)and its precursors during the MWG decreased largely compared with post-MWG values,and only O_(3),NO_({1.,and oxygenated VOCs(OVOCs)declined compared with pre-MWG values,which revealed the emission reduction measures during the MWG played an important role for O_(3)*** six VOCs sources,the mass contributions of biomass burning and solvents usage during the MWG decreased largely compared with pre-MWG values.O_(3)production was sensitive to VOCs and the key species were aromatics,OVOCs,and alkenes,which originated mainly from solvents usage,biomass burning,industrial-related combustion,and vehicle *** O_(3)concentration during the strict control was mainly caused by OVOCs reduction due to biomass burning ***,the O_(3)abatement strategies of Wuhan should be focused on the mitigation of high-reactivity VOCs.

关键词： VOCs Ozone Wuhan Military World Games Source apportionment Relative incremental reactivity Random forest

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Metal-organic framework-derived CoSe_(2.@N-doped carbon nanocubes for high-performance lithium-ion capacitors

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Rare Metals 2024年第5期43卷 2150-2160页

作者： lei {1. Xiong {2. Yan-Yan Kong Chen Li Ya-Bin An Xian-Zhong Sun Kai {1. Yan-Wei Ma institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China School of Engineering sciences University of Chinese Academy of SciencesBeijing 100190China institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu ZhongkeJinan 250013China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Cobalt selenide(CoSe_(2.)has garnered considerable attention as a prospective anode candidate for advanced lithium-ion storage,prompting comprehensive ***,CoSe_(2.-based anodes usually suffer from significant volume variation upon lithiation leading to unsatisfactory cycling ***,a versatile synthesis route is proposed for the in-situ fabrication of CoSe2.anoparticles embedded in N-dope carbon skeleton(CoSe_(2.@NC)through annealing treatment and selenization of a metal–organic framework-derived(MOF)*** N-doped carbon derived from the MOF serves not only as an excellent conductive substrate but also as a confined reactor,effectively inhibiting the structural instability and alleviating the inevitable volume change of CoSe_(2..Owing to their unique nanostructure,the as-prepared CoSe_(2.@NC exhibits a high capacity of 745.9mAh·g^(-1.at 0.1.A·g^(-1.,while maintaining excellent rate capability and an impressive ***,the assembled lithium-ion capacitor(LIC)based on CoSe_(2.@NC demonstrates an energy density of 1.0Wh·kg^(-1.,a power density of 2..6 kW·kg^(-1.,and remarkable capacity retention of 90.8%after 8000 *** results highlight the great potential of CoSe_(2.@NC for practical applications.

关键词： Lithium capacitors Cobalt selenide Metal-organic frameworks N-doped carbon

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A New SHRIMP Age of the Xiamaling Formation in the North china Plate and Its Geological Significance

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Acta Geologica Sinica(English Edition) 2007年第6期81卷 1103-1109页

作者： GAO Linzhi~(1,*)zhang Chuanheng~2.SHI Xiaoying~2.ZHOU Hongrui~2.wang Ziqiang~2.SONG Biao~(1,3) 1 {2. of Geology,chinese academy of Geological sciences,beijing 100037,china 2.8} University of Geosciences(beijing),beijing 100083,china 3 beijing SHRIMP Central,100037 beijing,china institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China

Setting up the hypostratotype of late Precambrian is the main aim of the research on the Meso-and Neoproterozoic in North *** chronostratigraphic position is the key in this study. However,many key horizons have not been calibrated with the high-quality isotopic *** the reported new U-Pb age with the Sensitive High-Resolution Ion Microprobe（SHRIMPⅡ）,a zircon U- Pb age was obtained of the ash bed in the Xiamaling Formation in North china Plate,yielding a weighted mean;Pb/;U age of 1.68±1.1.*** is the first SHRIMP U-Pb age from the Xiamaling Formation in the North china Plate,and represents the depositing time of the middle part of the Xiamaling *** zircon age plays an important role to understanding geological evolution of the North china Plate during Meso-and Neoproterozoic.

关键词： SHRIMP U-Pb Dating Mesoproterozoic Xiamaling Formation North china Plate

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Narrow line Seyfert 1.galaxies: where are the broad line regions?

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Science china(Physics,{1. & Astronomy) 2010年第12期53卷 2307-2311,2339-2343页

作者： MAO WeiMing 1,2.3 , HU Chen 2., wang JianMin 2., BIAN WeiHao 4 , zhang Shu {2. ZHAO Gang 1 1 Key Laboratory of Optical Astronomy, National Astronomical Observatories, chinese academy of sciences, beijing 100012.{2. 2.Key Laboratory for Particle Astrophysics, institute of High Energy Physics, chinese academy of sciences, beijing 100049, china 3 Graduate University of the chinese academy of sciences, beijing 100049, china 4 Department of Physics, Nanjing Normal University, Nanjing 2.0011, china 1. Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China2. Key Laboratory for Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China3. Graduate University of the Chinese Academy of Sciences Beijing 100049 China4. Department of Physics Nanjing Normal University Nanjing 210011 China

A sample consisting of 2.1.narrow line Seyfert 1.galaxies (NLS1.) with high quality spectra from the Sloan Digital Sky Survey (SDSS) is selected to explore where broad line regions are in these objects. We find that the Hβ profile can be fitted well by three (narrow, intermediate and broad) Gaussian components, and the FWHM ratios of the broad to the intermediate components hold a constant of 3.0 roughly for the entire sample. If the broad components originate from the region scaled by the well-determined Hβ reverberation mapping relation, we find that the intermediate components originate from the inner edge of the torus, which is scaled by dust K-band reverberation. We find that the IC and the BC are strongly linked dynamically, but the relation of their covering factors is much more relaxed, implying that both regions are clumpy.

关键词： black hole physics galaxies: evolution quasars: general

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PCAF-mediated acetylation of METTL3 impairs mRNA translation efficiency in response to oxidative stress

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Science china(Life {1.) 2024年第10期67卷 2157-2168页

作者： Cheng Liu Miao Yu Mengyuan wang Siyuan Yang Yenan Fu {1. {2. Chaoyang Zhu Hongquan {2. Program for Cancer and Cell Biology Department of Human AnatomyHistology and EmbryologySchool of Basic Medical SciencesPeking University International Cancer Instituteand State Key Laboratory of Molecular OncologyPeking University Health Science CenterBeijing 100191China Department of General Surgery and Urological Surgery Huaihe HospitalHenan UniversityKaifeng 100084China Department of Human Anatomy Histologyand EmbryologyShenzhen University School of MedicineShenzhen 518055China

METTL3 methylates RNA and regulates the fate of mRNA through its methyltransferase ***3 enhances RNA translation independently of its catalytic ***,the underlying mechanism is still ***,we report that METTL3 is both interacted with and acetylated at lysine 1.7 by the acetyltransferase PCAF and deacetylated by *** the methyltransferase activity nor the stability of METTL3 is affected by its acetylation at ***,acetylation of METTL3 blocks its interaction with EIF3H,a subunit of the translation initiation factor,thereby reducing mRNA translation ***,acetylation of METTL3 responds to oxidative ***,oxidative stress enhances the interaction of PCAF with METTL3,increases METTL3 acetylation,and suppresses the interaction of METTL3 with EIF3H,thereby decreasing the translation efficiency of ribosomes and inhibiting cell ***,we suggest a mechanism by which oxidative stress regulates RNA translation efficiency by the modulation of METTL3 acetylation mediated by PCAF.

关键词： METTL3 acetylation PCAF m^(6)A oxidative stress translation SIRT3

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