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中国科学:技术科学（英文版）
中国科学:技术科学（英文版）

周光召

月刊

1674-7321

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中国科学:技术科学（英文版）/Journal Science China Technological SciencesCSCDCSTPCDEISCI
查看更多>>《中国科学》是中国科学院主办、中国科学杂志社出版的自然科学专业性学术刊物。《中国科学》任务是反映中国自然科学各学科中的最新科研成果，以促进国内外的学术交流。《中国科学》以论文形式报道中国基础研究和应用研究方面具有创造性的、高水平的和有重要意义的科研成果。在国际学术界，《中国科学》作为代表中国最高水平的学术刊物也受到高度重视。国际上最具有权威的检索刊物SCI，多年来一直收录《中国科学》的论文。1999年《中国科学》夺得国家期刊奖的第一名。
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    Modifying Lyapunov exponent of chaotic map by self-cascading

    YI ChenLongLI ChunBiaoLI YongXinXIA Ming...
    2203-2214页
    查看更多>>摘要：The self-cascade(SC)method is an effective technique for chaos enhancement and complexity increasing in chaos maps.Additionally,the controllable self-cascade(CSC)method allows for more accurate control of Lyapunov exponents of the discrete map.In this work,the SC and CSC systems of the original map are derived,which enhance the chaotic performance while preserving the fundamental dynamical characteristics of the original map.Higher Lyapunov exponent of chaotic sequences corresponding to higher frequency are obtained in SC and CSC systems.Meanwhile,the Lyapunov exponent could be linearly controlled with greater flexibility in the CSC system.The verification of the numerical simulation and theoretical analysis is carried out based on the platform of CH32.
      原文链接:
    • 万方数据
    • 维普

    Joint observations of the large-scale ULF wave activity from space to ground associated with the solar wind dynamic pressure enhancement

    SUN XiaoYingHU YunPengZHIMA ZerenDUAN SuPing...
    2215-2229页
    查看更多>>摘要：This study reports the rare ultralow-frequency(ULF)wave activity associated with the solar wind dynamic pressure en-hancement that was successively observed by the GOES-17(Geostationary Operational Environmental Satellite)in the mag-netosphere,the CSES(China Seismo-Electromagnetic Satellite)in the ionosphere,and the THEMIS ground-based observatories(GBO)GAKO and EAGL in the Earth's polar region during the main phase of an intense storm on 4 November 2021.Along with the enhanced-pressure solar wind moving tailward,the geomagnetic field structure experienced a large-scale change.From dawn/dusk sides to midnight,the GAKO,EAGL,and GOES-17 sequentially observed the ULF waves in a frequency range of 0.04-0.36 Hz at L shells of～5.07,6.29,and 5.67,respectively.CSES also observed the ULF wave event with the same frequency ranges at wide L-shells of 2.52-6.22 in the nightside ionosphere.The analysis results show that the ULF waves at ionospheric altitude were mixed toroidal-poloidal mode waves.Comparing the ULF waves observed in different regions,we infer that the nightside ULF waves were directly or indirectly excited by the solar wind dynamic pressure increase:in the area of L-shells～2.52-6.29,the magnetic field line resonances(FLRs)driven by the solar wind dynamic pressure increase is an essential excitation source;on the other hand,around L～3.29,the ULF waves can also be excited by the outward expansion of the plasmapause owing to the decrease of the magnetospheric convection,and in the region of L-shells～5.19-6.29,the ULF waves are also likely excited by the ion cyclotron instabilities driven by the solar wind dynamic pressure increase.
      原文链接:
    • 万方数据
    • 维普

    Towards experimental studying the airborne sound insulation of light frame walls with staggered studs

    ZHANG YuCaiYUE KongXIE YiFanCHENG XiangYu...
    2230-2243页
    查看更多>>摘要：Light frame walls(LFWs)serve as common partition walls in prefabricated buildings due to their lightweight nature,cost-effectiveness,energy efficiency,and adaptability for rapid on-site assembly.However,their acoustic insulation capability is hindered by issues such as sound bridges,resonance,and coincidence dips,resulting in inadequate sound insulation.This study aims to propose LFW designs with superior acoustic insulation suitable for practical engineering while meeting prevailing national standards.Nine full-scale LFW configurations were subjected to laboratory testing to evaluate the impact of staggered stud arrangements,stud types,and incorporation of compounded materials.The tests were performed between 100 and 5000 Hz,and the sound pressure level and reverberation time at 1/3 octave band were measured and used to calculate the weighted sound insulation index(Rw).Results demonstrated that the outlined design modifications significantly enhanced the sound insulation of the LFW.These modifications effectively mitigate the influence of sound bridges while addressing resonance and coincidence dips inherent in the wall system.Particularly noteworthy was the superior sound insulation achieved by staggered-stud LFWs with compounded materials,surpassing that of autoclaved lightweight concrete walls commonly used in prefabricated con-structions despite having lesser thickness and surface density.Rw values increased from 43 to 54 dB compared to conventional LFWs,translating to a notable elevation in airborne sound insulation level from 4 to 7 as an internal separation component,meeting the requisite standards for most applications.
      原文链接:
    • 万方数据
    • 维普

    Exciting broadband thermochromic transmission property opposite to vanadium dioxide in the atmospheric window

    GONG YiQuanGUO YanMingCHEN ShuNiLI Meng...
    2244-2254页
    查看更多>>摘要：The traditional telecommunications band performs poorly in harsh weather conditions due to atmospheric absorption.In recent years,researchers have begun to study optical communication through atmospheric windows,and optical switches are an essential component of optical communication.A broadband atmospheric window optical switch was proposed based on Vanadium dioxide and magnetic polaritons(MP).It is formed by the stacking of two metal-dielectric-metal structures.The simulation results show that the modulation depth can reach 98.38％,and the extinction ratio is 17.93 dB.By calculating the magnetic field,we confirmed that the reason for the"off'mode is the coupling between the different MP modes,while the"on"mode is the excitation of MP.The optical switch we proposed may be applied to radiation cooling and optical satellite communication.
      原文链接:
    • 万方数据
    • 维普

    Screening current in ultra-high-field non-insulated superconducting magnets

    ZHOU BenZheWANG LeiCHEN YongWANG QiuLiang...
    2255-2273页
    查看更多>>摘要：Screening current is recognized as one of the critical elements limiting the progression of superconducting magnets toward achieving higher magnetic fields.Currently,most non-insulated(NI)superconducting magnets consider the magnet as insulated when addressing the issue of screening current.However,the bypass current in the NI magnet can modify the actual history of magnetization,so the screening current in NI magnet will be different from that in the insulated magnet.This paper presents a novel method based on the homogenized T-A formulation(T is the current vector potential,and A is the magnetic vector potential),which enables real-time simulation of both the bypass current behavior and the implications of screening current in NI superconducting magnets,even when these magnets contain tens of thousands of turns.We have developed a 32 T NI hybrid superconducting magnet and validated the effectiveness of this method through experiments.Employing this efficacious method,we conducted a comprehensive calculation of screening current in NI magnets,comparing them with insulated magnets in terms of screening current-induced stress(SCIS),screening current-induced field(SCIF),and losses.The results indicate that in the NI insert coils,the sequential excitation of background coils and insert coils induces a reverse screening current,resulting in slightly lower SCIF and SCIS compared to those in the insulated magnets.The method and results can contribute to the enhancement of magnet design and provide valuable insights for the development of ultra-high fields(UHF)NI magnets.
      原文链接:
    • 万方数据
    • 维普

    Beyond 600G fiber-THz wireless seamless integration system employing cascaded MIMO equalizers

    DING JunJieTONG WeiDongLI XinTongZHANG Zheng...
    2274-2276页
      原文链接:
    • 万方数据
    • 维普

    Toward quantum unmanned systems

    CHENG ShuMingQI HongShengSUN YueLIU LiJun...
    2277-2280页
      原文链接:
    • 万方数据
    • 维普