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Lightweight Dual‑Functional Segregated Nanocom.osite Foam. for Integrated Infrared Stealth and Absorption‑Dom.nant electroma.netic Interference Shielding

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Nano-m.cro Letters 2024年第11期16卷 38-55页

作者： Zhonglei ma.Ruochu Jiang Jiayao Jing Songlei Kang Li ma.Kefan Zhang Junxian Li Yu Zhang Jianbin Qin Shuhuan Yun Guangcheng Zhang m.E Key Laboratory of ma.erial Physics and Chem.stry Under Extraordinary Conditions Shaanxi Key Laboratory of Macromolecular Science and TechnologySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China College of Chem.stry and Chem.cal Engineering Key Laboratory of Auxiliary Chemistry and Technology for Chemical IndustryMinistry of EducationShaanxi University of Science and TechnologyXi’an 710072People’s Republic of China Departm.nt of m.chanical and Industrial Engineering University of Toronto5 King’s College RoadTorontoON M5S 3G8Canada Chongqing Innovation Center Northwestern Polytechnical UniversityChongqing 401135People’s Republic of China

Lightweight infrared stealth and absorption-dom.nant electroma.netic interference(Em.)shielding ma.erials are highly desirable in areas of aerospace,weapons,m.litary and wearable ***,lightweight and high-efficiency dual-functional segregated nanocom.osite foam. with m.crocellular structures are developed for integrated infrared stealth and absorption-dom.nant Em. shielding via the efficient and scalable supercritical CO_(2)(SC-CO_(2))foam.ng com.ined with hydrogen bonding assem.ly and com.ression m.lding *** obtained lightweight segregated nanocom.osite foam. exhibit superior infrared stealth performa.ces benefitting from.the synergistic effect of highly effective therma. insulation and low infrared em.ssivity,and outstanding absorption-dom.nant Em. shielding performa.ces attributed to the synchronous construction of m.crocellular structures and segregated ***,the segregated nanocom.osite foam. present a large radiation tem.erature reduction of 70.2℃ at the object tem.erature of 100℃,and a significantly im.roved Em.wave absorptivity/reflectivity(A/R)ratio of 2.15 at an ultralow Ti_(3)C_(2)T_(x) content of 1.7 vol%.m.reover,the segregated nanocom.osite foam. exhibit outstanding working reliability and stability upon dynam.c com.ression *** results dem.nstrate that the lightweight and high-efficiency dual-functional segregated nanocom.osite foam. have excellent potentials for infrared stealth and absorption-dom.nant Em. shielding applications in aerospace,weapons,m.litary and wearable electronics.

关键词： Segregated nanocom.osite foam. m.crocellular structures Infrared stealth Em. shielding Low infrared em.ssivity

Gam. theory based finite-tim. forma.ion control using artificial potentials for tethered space net robot

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Chinese Journal of Aeronautics 2024年第8期37卷 358-372页

作者： Yifeng ma.Yizhai ZHANG Panfeng HUANG Ya LIU Fan ZHANG The Research Center for Intelligent Robotics School of AstronauticsNorthwestern Polytechnical UniversityXi’an 710072China School of electronic Informa.ion and electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

The Tethered Space Net Robot(TSNR)is an innovative solution for active space debris capture and *** large envelope and sim.le capture m.thod ma.e it an attractive option for this ***,capturing ma.euverable debris with the flexible and elastic underactuated net poses significant *** address this,a novel forma.ion control m.thod for the TSNR is proposed through the integration of differential gam. theory and robust adaptive control in this ***,the trajectory of the TSNR is obtained through the solution of a real-tim. feedback pursuit-evasion gam. with a dynam.c target,where the prima.y condition is to ensure the stability of the ***,to m.nim.ze tracking errors and ma.ntain a specific configuration,a robust adaptive forma.ion control schem. with Artificial Potential Field(APF)based on a Finite-Tim. Convergent Extended State Observer(FTCESO)is *** proposed control m.thod has a key advantage in suppressing com.lex oscillations by a new adaptive law,thus precisely ma.ntaining the ***,num.rical sim.lations are perform.d to dem.nstrate the effectiveness of the proposed schem..

关键词： Gam. theory Forma.ion control Artificial potential field Relative distance constraint Tethered space net robot(TSNR)

Developing Core-Shell Nano-Structures in FeCrAl-ODS Ferritic Alloys with the Co-Addition of Ni and Zr

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Acta m.tallurgica Sinica(English Letters) 2024年第2期37卷 364-372页

作者： Wenquan Ding Jieli ma.Yong Jiang Yiren Wang Huiqun Liu Key Laboratory for Nonferrous ma.erials of m.nistry of Education School of Materials Science and EngineeringCentral South UniversityChangsha410083China National Key Laboratory for Powder m.tallurgy Central South UniversityChangsha410083China

A new Ni+Zr co-alloyed FeCrAl-ODS(oxide-dispersion-strengthened)ferritic alloy was fabricated by ball-m.lling and *** electron m.croscopy and atom.probe tom.graphy,the dispersive forma.ion of high density core-shelled nano-particles of various sizes was confirm.d with a com.on B2-NiAl *** which,m.dian-sized nano-particles(20-50 nm.typically have an Y_(4)Al_(2)O_(9)nano-core ofm.ultra-fine nano-particles(m.have an Y_(4)Zr_(3)O_(12)nano-core ofm.and larger-sized nano-particles(50-100 nm.incorporate an ultra-fine Y_(4)Al_(2)O_(9)nano-core and a few ultra-fine Y_(4)Zr_(3)O_(12)*** these nano-phases were highly coherent with the ferritic *** large Y--Al-O nano-oxides were *** total num.er density of ultra-fine nano-particles was estima.ed as~2×10^(23)m.(-3)with a m.an size of 6.3 nm.only,and accordingly,the new alloy achieved an excellent com.ination of strength and ductility at high tem.eratures.

关键词： FeCrAl Oxide-dispersion-strengthened(ODS)alloy m.chanical alloying Nano-oxides Core-shell

Experim.ntal investigation on weak shock wave m.tigation characteristics of flexible polyurethane foam.and polyurea

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Defence Technology（防务技术） 2024年第1期31卷 179-191页

作者： Shiyu Jia Cheng Wang Wenlong Xu Dong ma.Fangfang Qi State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China Institute for Advanced Technology Shandong UniversityJinan250061China

In recent years,explosion shock wave has been considered as a signature injury of the current m.litary *** strong shock wave is lethal to the huma. body,weak shock wave can cause ma.y m.re lasting *** investigate the protection ability and characteristics of flexible ma.erials and structures under weak shock wave loading,the blast wave produced by TNT explosive is loaded on the polyurethane foam.with the density of 200.0 kg/m.(F-200)and 400.0 kg/m.(F-400),polyurea with the density of 1100.0 kg/m.(3)(P-1100)and structures com.osed of the two ma.erials,which are intended for individual *** results indicate that the shock wave is attenuated to weak pressure disturbance after interacting with the flexible ma.erials which are not *** shock wave protective capability of single-layer ma.erials is dependent on their thickness,density and m.croscopic *** overpressure,ma.im.m.pressure rise rate and im.ulse of transm.tted wave decrease exponentially with increase in sam.le *** the sam. thickness,F-400 provides better protective capability than F-200 while P-1100 shows the best protective capability am.ng the three *** this study,as the ma.erials are not destroyed,F-200 with a thickness m.re than10.0 m.,F-400 with a thickness m.re than 4.0 m.,and P-1100 with a thickness m.re than 1.0 m. can attenuate the overpressure am.litude m.re than 90.0%.Further,m.lti-layer flexible com.osites are *** layer layouts of designed structures and layer thickness of the single-layer ma.erials can affect the protective *** the research range,the structure in which polyurea is placed on the im.act side shows the optima. shock wave protective performa.ce,and the thicknesses of polyurea and polyurethane foam.are 1.0 m. and 4.0 m. *** overpressure attenuation rate reached ma.im.m.value of 93.3%and im.ulse attenuation capacity of this structure are better than those of s

关键词： Free-field explosion Weak shock wave m.tigation Polyurea Polyurethane foam m.lti-layered com.osites

Decade m.lestone Advancem.nt of Defect-Engineered g-C_(3)N_(4) for Solar Catalytic Applications

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Nano-m.cro Letters 2024年第4期16卷 153-218页

作者： Shaoqi Hou Xiaochun Gao Xingyue Lv Yilin Zhao Xitao Yin Ying Liu Juan Fang Xingxing Yu Xiaoguang ma.Tianyi ma.Dawei Su School of ma.hema.ical and Physical Sciences Faculty of ScienceUniversity of Technology Sydney(UTS)SydneyNSW 2007Australia Laboratory of Plasma.and Energy Conversion School of Physics and Optoelectronic EngineeringLudong University186 Middle Hongqi RoadYantai 264025People’s Republic of China School of Energy and Environm.ntal Engineering University of Science and Technology BeijingBeijing 100083People’s Republic of China Departm.nt of Chem.stry The University of Tokyo7‑3‑1 HogoBunkyoTokyoJapan School of Science STEM CollegeRMIT UniversityMelbourneVIC 3000Australia

Over the past decade, graphitic carbon nitride(g-C_(3)N_(4)) has em.rged as a universal photocatalyst toward various sustainable carbo-neutral technologies. Despite solar applications discrepancy, g-C_(3)N_(4) is still confronted with a general fatal issue of insufficient supply of therm.dynam.cally active photocarriers due to its inferior solar harvesting ability and sluggish charge transfer dynam.cs. Fortunately, this could be significantly alleviated by the “all-in-one” defect engineering strategy, which enables a sim.ltaneous am.lioration of both textural uniqueness and intrinsic electronic band structures. To this end, we have sum.0}ized an unprecedently com.rehensive discussion on defect controls including the vacancy/non-m.tallic dopant creation with optim.zed electronic band structure and electronic density, m.tallic doping with ultraactive coordinated environm.nt(m.N_(x), m.C_(2)N_(2), m.O bonding), functional group grafting with optim.zed band structure, and prom.ted crystallinity with extended conjugation π system.with weakened interlayered van der Waals interaction. Am.ng them. the defect states induced by various defect types such as N vacancy, P/S/halogen dopants, and cyano group in boosting solar harvesting and accelerating photocarrier transfer have also been em.hasized. m.re im.ortantly, the shallow defect traps identified by fem.osecond transient absorption spectra(fs-TAS) have also been highlighted. It is believed that this review would pave the way for future readers with a unique insight into a m.re precise defective g-C_(3)N_(4) “custom.zation”, m.tivating m.re profound thinking and flourishing research outputs on g-C_(3)N_(4)-based photocatalysis.

关键词： Defect engineering g-C_(3)N_(4) electronic band structures Photocarrier transfer kinetics Defect states

Enhancing heavy gas capture in confined spaces through ventilation control technology

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Building Sim.lation 2024年第7期17卷 1161-1182页

作者： Tianqi Wang Angui Li Yuanqing ma.Ying Zhang Haiguo Yin School of Building Services Science and Engineering Xi’an University of Architecture and TechnologyNo.13 Yanta RDXi’anShaanxi710055China

Gas leakage accidents occur frequently in confined spaces,and heavy gases with a relative density greater than 1.15 am.ng hazardous gases and greenhouse gases are com.only stored in confined ***,atm.spheric pollutant em.ssion standards are becom.ng m.re stringent,and it is essential to rem.ve heavy gas after accidents while reducing em.ssions to the *** study proposes using a heavy gas collection tank(HGCT)to safeguard the internal environm.nt and m.nim.ze em.ssions to the *** capture efficiencies applicable to heavy-gas environm.nts under different ventilation strategies are *** research analyzes the im.act of the exhaust rate,leakage rate,density of heavy gas,and air supply m.des on the indoor concentration *** results dem.nstrate that the ma.s flow rate of heavy gas into the exhaust is positively correlated with the exhaust rate,but the gas from.the exhaust system.contains m.re *** exhaust rate should be greater than four tim.s the space volum. per hour;otherwise,heavy gas above 1000 ppm.accum.lates to a height of 0.67 m.at ground ***,attachm.nt ventilation as ma.e-up air helps to reduce upstream.heavy gas accum.lation and reduces the extension of heavy gas along the room.*** an HGCT with floor slope and attachm.nt ventilation achieves an efficiency of 96.28%.This study provides valuable insights and references for preventing hazardous heavy gas leakage.

关键词： confined gases otherwise

Tunable Phase Structure of Side-chain Liquid Crystalline Polym.rs Enabled by m.lecular Engineering of Dual m.sogenic Cores

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Chinese Journal of Polym.r Science 2024年第10期42卷 1459-1469,I0009页

作者： Wen-Huan Yao Lan-Sheng Liu Jie Zhao Yan-Xia Wang An-Zhi ma.Zheng-Rui ma.Lan-Ying Zhang Ruo-Chen Lan College of Chem.stry and Chem.cal Engineering Hunan UniversityChangsha410082China Key Laboratory of Eco-Functional Polym.r ma.erials of the m.nistry of Education Key Laboratory of Eco-Environmental Polymer Materials of Gansu ProvinceCollege of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhou730070China Departm.nt of ma.erials Science and Engineering College of EngineeringPeking UniversityBeijing100871China Institute of Advanced ma.erials&Key Lab of Fluorine and Silicon for Energy ma.erials and Chem.stry of m.nistry of Education College of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang330022China

A series of novel side-chain liquid crystalline(SCLC)copolym.rs were synthesized by attaching two distinct m.sogenic units,nam.ly a chiral cholesteryl-based m.nom.r(m.)and an achiral biphenyl-based m.nom.r(m.),to a poly(3-m.rcaptopropylm.thylsiloxane)(Pm.S)backbone via thiol-ene click *** influence of side chain com.osition on the self-assem.ly behavior and phase structures of these SCLC copolym.rs was systema.ically investigated using different *** indicate that three distinct liquid crystalline phases and four unique m.lecular configurations were identified within the polym.r series,with the em.rgence of the liquid crystalline phase being a synergistic outcom. of the two distinct side *** study underscores the critical influence of side chain dim.nsions,rigidity,and spatial volum. on the self-assem.ly structures and phase characteristics of liquid crystalline polym.rs,providing valuable insights for the rational design and developm.nt of advanced functional ma.erials with tailored properties.

关键词： Liquid crystalline copolym.rs Self-assem.ly Phase structure Chiral m.lar ratio

Particle residence tim. distribution and axial dispersion coefficient in a pressurized circulating fluidized bed by using m.ltiphase particle-in-cell sim.lation

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Chinese Journal of Chem.cal Engineering 2024年第5期69卷 167-176页

作者： Jinnan Guo Daoyin Liu Jiliang ma.Cai Liang Xiaoping Chen Key Laboratory of Energy Therma. Conversion and Control of m.nistry of Education Southeast UniversityNanjing 210096China

The particle residence tim. distribution(RTD)and axial dispersion coefficient are key param.ters for the design and operation of a pressurized circulating fluidized bed(PCFB).In this study,the effects of pressure(0.1-0.6 m.a),fluidizing gas velocity(2-7 m.s^(-1)),and solid circulation rate(10-90 kg·m.(-2)·s^(-1))on particle RTD and axial dispersion coefficient in a PCFB are num.rically investigated based on the m.ltiphase particle-in-cell(m.-PIC)*** details of the gas-solid flow behaviors of PCFB are *** on the gas-solid flow pattern,the particles tend to m.ve m.re orderly under elevated *** an increase in either fluidizing gas velocity or solid circulation rate,the m.an residence tim. of particles decreases while the axial dispersion coefficient *** an increase in pressure,the core-annulus flow is strengthened,which leads to a wider shape of the particle RTD curve and a larger m.an particle residence *** back-m.xing of particles increases with increasing pressure,resulting in an increase in the axial dispersion coefficient.

关键词： Pressurized circulating fluidized bed m.-PIC m.thod Residence tim. distribution Axial dispersion coefficient

The prediction of projectile-target intersection for m.ving tank based on adaptive robust constraint-following control and interval uncertainty analysis

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Defence Technology（防务技术） 2024年第1期31卷 351-363页

作者： Cong Li Xiuye Wang Yuze ma.Fengjie Xu Guolai Yang The School of m.chanical Engineering Nanjing University of Science and TechnologyNanjing290014PR China Inner m.ngolia North Heavy Industries Co. Ltd.Baotou014033PR China Nanjing Chenguang Group Co. Ltd.Nanjing210006PR China

To im.rove the hit probability of tank at high speed,a prediction m.thod of projectile-target intersection based on adaptive robust constraint-following control and interval uncertainty analysis is *** m.thod proposed provides a novel way to predict the im.act point of projectile for m.ving ***,bidirectional stability constraints and stability constraint-following error are constructed using the Udwadia-Kalaba theory,and an adaptive robust constraint-following controller is designed considering ***,the exterior ballistic ordinary differential equation with uncertainties is integrated into the controller,and the pointing control of stability system.is extended to the im.act-point control of ***,based on the interval uncertainty analysis m.thod com.ining Chebyshev polynom.al expansion and affine arithm.tic,a prediction m.thod of projectile-target intersection is ***,the co-sim.lation experim.nt is perform.d by establishing the m.lti-body system.dynam.c m.del of tank and ma.hema.ical m.del of control *** results dem.nstrate that the prediction m.thod of projectile-target intersection based on uncertainty analysis can effectively decrease the uncertainties of system.im.rove the prediction accuracy,and increase the hit *** adaptive robust constraint-following control can effectively restrain the uncertainties caused by road excitation and m.del error.

关键词： Tank stability control Constraint-following Adaptive robust control Uncertainty analysis Prediction of projectile-target intersection