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Magnetic-Dielectric Synergy in One-Dimensional Metal Heterostructures for Enhanced Low-Frequency Microwave Absorption 认领 引用 被引量：3
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作者 Feiyue Hu Peigen Zhang +10 位作者 Pei Ding Shuo Zhang Bingbing Fan Ali Saffar Shamshirgar Wei Zheng Wenwen Sun Longzhu Cai Haijiao Xie Qiyue Shao Johanna Rosen ZhengMing Sun 《Nano-Micro Letters》 SCIE EI CAS CSCD 2026年第5期371-390,共20页
Microwave absorption(MA)materials often face poor synergy between impedance matching and attenuation in the low-frequency range.Balancing permittivity and permeability through magnetic-dielectric synergy is a promisin... Microwave absorption(MA)materials often face poor synergy between impedance matching and attenuation in the low-frequency range.Balancing permittivity and permeability through magnetic-dielectric synergy is a promising strategy to address this issue.To realize the synergy,herein,Sn whiskers with an in situ oxide layer served as substrates for magnetic-loss-active CoNi nanosheet growth,forming a hierarchical CoNi@SnO2@Sn(CNS)heterostructure.The CNS absorber achieves a minimum reflection loss(RLmin)value of-62.29 dB with an effective absorption bandwidth(EAB)of 2.2 GHz,covering the entire C-band with 70%absorption at only 2.61 mm thickness.The nanosheet design of CoNi enhances magnetic anisotropy to promote natural resonance,while the conductive Sn core and abundant Sn/SnO2 and CoNi/SnO2 heterointerfaces facilitate conduction loss and dielectric polarization.When composited into a thermoplastic polyurethane(TPU)matrix,the resulting CNS/TPU-2 film(20 wt%CNS)exhibits an RLmin value of-61.04 dB and a 2.5 GHz EAB.Its in-plane and through-plane thermal conductivities reach 2.41 and 0.51 W m-1 K-1,representing 4.1 and 2.6 times those of pure TPU films,respectively,facilitating heat dissipation from protected devices.This work provides valuable insights into magnetic-dielectric synergy for low-frequency MA of 1D metal-based materials,offering promising potential for 5G communications and flexible electronics. 展开更多
关键词 Low frequency microwave absorption Magnetic-dielectric synergy MAX phase CoNi@SnO2@Sn heterostructure Thermal conductivity
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Novel cable-like tin@carbon whiskers derived from the Ti2SnC MAX phase for ultra-wideband electromagnetic wave absorption 认领 引用 被引量：8
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作者 Feiyue Hu Pei Ding +7 位作者 Fushuo Wu Peigen Zhang Wei Zheng Wenwen Sun Rui Zhang Longzhu Cai Bingbing Fan ZhengMing Sun 《Carbon Energy》 SCIE EI CAS CSCD 2024年第12期1-13,共13页
One-dimensional(1D)metals are well known for their exceptional conductivity and their ease of formation of interconnected networks that facilitate electron migration,making them promising candidates for electromagneti... One-dimensional(1D)metals are well known for their exceptional conductivity and their ease of formation of interconnected networks that facilitate electron migration,making them promising candidates for electromagnetic(EM)attenuation.However,the impedance mismatch from high conductivity and their singular mode of energy loss hinder effective EM wave dissipation.Construction of cable structures not only optimizes impedance matching but also introduces a multitude of heterojunctions,increasing attenuation modes and potentially enhancing EM wave absorption(EMA)performance.Herein,we showcase the scalable synthesis of tin(Sn)whiskers from a Ti2SnC MAX phase precursor,followed by creation of a 1D tin@carbon(Sn@C)cable structure through polymerization of PDA on their surface and annealing in argon.The EMA capabilities of Sn@C significantly surpass those of uncoated Sn whiskers,with an effective absorption bandwidth reaching 7.4 GHz.Remarkably,its maximum radar cross section reduction value of 27.85 dBm2 indicates its exceptional stealth capabilities.The enhanced EMA performance is first attributed to optimized impedance matching,and furthermore,the Sn@C cable structures have rich SnO2/C and Sn/SnO2 heterointerfaces and the associated defects,which increase interfacial and defect-induced polarization losses,as visually demonstrated by off-axis electron holography.The development of the Sn@C cable structure represents a notable advancement in broadening the scope of materials with potential applications in stealth technology,and this study also contributes to the understanding of how heterojunctions can improve EMA performance. 展开更多
关键词 cable structure electromagnetic wave absorption interfacial polarization Sn whiskers Sn@C
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基于水量平衡的澳洲坚果灌溉制度研究 认领 引用 被引量：1
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作者 裴鼎 余航 +3 位作者 潘梦楠 何洋 唐红燕 王丽 《江西农业学报》 CAS 2025年第1期84-91,共8页
基于澜沧气象站1958-2017年的实测气象资料,采用作物系数法和水量平衡法计算澳洲坚果各生育期的作物需水量及不同典型年的灌溉定额,利用灌水上、下限的差值制定了适宜的灌溉制度。澳洲坚果在丰水年、平水年、中等干旱年及特枯年的需水... 基于澜沧气象站1958-2017年的实测气象资料,采用作物系数法和水量平衡法计算澳洲坚果各生育期的作物需水量及不同典型年的灌溉定额,利用灌水上、下限的差值制定了适宜的灌溉制度。澳洲坚果在丰水年、平水年、中等干旱年及特枯年的需水量分别为829.55、844.99、875.24、915.07 mm,各生育期的需水量由大到小依次为:成熟期—采摘期>果实膨大期>萌芽期—花期>休眠期。各典型年的作物系数基本不变,萌芽期—花期(休眠期)、果实膨大期、成熟期—采摘期的作物系数分别为0.33、0.91、0.76。不同灌水上、下限的差值会影响灌溉定额和灌溉制度,当差值大于6.0%时,灌溉定额保持不变,约为237.5 mm;当差值小于6.0%时,灌溉定额随差值减小而减小,当差值较小时,灌溉次数增多,灌水规律不一致;而当差值为3.3%时,制定的灌溉制度更为合理,即分别取灌水上限(19.8%)、下限(16.5%),在灌溉保证率分别为25%、50%、75%、95%时,灌溉定额分别为1921.65、2149.35、2317.50、2652.30 m3/hm2,灌溉次数分别为16、18、19、21次。最适宜的灌水上、下限的差值为3.3%,在此条件下制定的灌溉制度科学合理且能够提高水资源的利用效率。研究结果可为目前缺少试验资料的澳洲坚果灌溉管理、灌溉工程规模确定和农业水资源高效利用提供科学依据。 展开更多
关键词 澳洲坚果 作物需水量 灌水上下限 灌溉制度
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Differentiated design strategies toward broadband achromatic and polarizationinsensitive metalenses 认领 引用 被引量：2
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作者 Ximin Tian Yafeng Huang +5 位作者 Junwei Xu Tao Jiang Pei Ding Yaning Xu Shenglan Zhang Zhi-Yuan Li 《Advanced Photonics Nexus》 2023年第5期44-55,共12页
Metasurfaces have emerged as a flexible platform for shaping the electromagnetic field via the tailoring phase,amplitude,and polarization at will.However,the chromatic aberration inherited from building blocks’diffra... Metasurfaces have emerged as a flexible platform for shaping the electromagnetic field via the tailoring phase,amplitude,and polarization at will.However,the chromatic aberration inherited from building blocks’diffractive nature plagues them when used in many practical applications.Current solutions for eliminating chromatic aberration usually rely on searching through many meta-atoms to seek designs that satisfy both phase and phase dispersion preconditions,inevitably leading to intensive design efforts.Moreover,most schemes are commonly valid for incidence with a specific spin state.Here,inspired by the Rayleigh criterion for spot resolution,we present a design principle for broadband achromatic and polarization-insensitive metalenses using two sets of anisotropic nanofins based on phase change material Ge2Sb2Se4Te1.By limiting the rotation angles of all nanofins to either 0 deg or 90 deg,the metalens with a suitable numerical aperture constructed by this fashion allows for achromatic and polarization-insensitive performance across the wavelength range of 4–5μm,while maintaining high focusing efficiency and diffraction-limited performance.We also demonstrate the versatility of our approach by successfully implementing the generation of broadband achromatic and polarization-insensitive focusing optical vortex.This work represents a major advance in achromatic metalenses and may find more applications in compact and chip-scale devices. 展开更多
关键词 metasurfaces broadband achromatic metalenses polarization insensitivity phase change materials of Ge2Sb2Se4Te1
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城市化对干燥度变化的影响——以云南省为例 认领 引用
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作者 潘梦楠 何洋 +3 位作者 陕丽萍 裴鼎 张航锐 王龙 《热带地理》 CSSCI CSCD 北大核心 2025年第5期916-927,共12页
城市化对局地气候的改变受到广泛关注,但城市化对干燥度的影响尚不明确。文章基于云南省16个主要城市1980―2022年的逐年干燥度数据,采用线性斜率、累积距平和滑动T检验分析了干燥度的变化趋势并识别其突变点。此外,建立了一个城市化效... 城市化对局地气候的改变受到广泛关注,但城市化对干燥度的影响尚不明确。文章基于云南省16个主要城市1980―2022年的逐年干燥度数据,采用线性斜率、累积距平和滑动T检验分析了干燥度的变化趋势并识别其突变点。此外,建立了一个城市化效应指标(AIUE)用于定量城市化对干燥度的影响,并进一步采用灰色关联度分析识别了社会经济指标对干燥度变化的影响。结果发现:1)1980―2000年,云南的干燥度呈现下降趋势,距平斜率为-0.0061;自2000年快速城市化以来,在2001―2022年,斜率增加至0.0043,AIUE为0.0104;同时,干燥度也由2000年之前的1.08上升至1.13,上升幅度为4.6%。2)分别根据云南16个主要城市的干燥度突变时间,将其划分为城市化前后2个阶段,各城市的干燥度城市化效应指标(AIUE)介于-0.0147~0.0188,81.3%的城市AIUE值>0,表明城市化使城市局地气候变得更加干燥。3)灰色关联分析结果表明,人口指标对干燥度序列的影响最大,其次为土地指标和交通指标。 展开更多
关键词 城市化效应 干燥度 城市气候 灰色关联分析 云南
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A high-sensitivity H2S gas sensor based on optimized ZnO-ZnS nano-heterojunction sensing material 认领 引用 被引量：8
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作者 Pei Ding Dongsheng Xu +4 位作者 Nan Dong Ying Chen Pengcheng Xu Dan Zheng Xinxin Li 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第8期2050-2054,共5页
This paper reports a high-performance H2S gas sensing material that is made of ZnO nanowires(NWs)modified by an optimal amount of ZnS to form nano-hete rojunctions.Compared with the intrinsic ZnONWs,the three differen... This paper reports a high-performance H2S gas sensing material that is made of ZnO nanowires(NWs)modified by an optimal amount of ZnS to form nano-hete rojunctions.Compared with the intrinsic ZnONWs,the three differently modified nano-heterostructure material ZnO-ZnS-x(x=5,10,15)shows significant improvement in sensing performance to H2S at the working temperatures of 100-400℃,especially in the low temperature range(<300℃).The chemiresistive sensor with ZnO-ZnS-10 sensingmaterial exhibits the largest response signal to H2S among all the other ZnO-ZnS-x(x=5,10,15,20)sensors.Its response signal to 5 ppm H2S at 150℃is about 2.7 times to that of the ZnO-NWs sensor.Besides,the ZnO-ZnS-10 sensor also features satisfactory selectivity and repeatability at 150℃.With the technical advantage attributed to the reduction of the redesigned band gap at the interface between ZnO and ZnS,the ZnO-ZnS hete ro structure sensor rather than the traditional ZnO-NWs sensor can be used for high-sensitivity application at low working temperature. 展开更多
关键词 ZnO-ZnS heterojunction Hydrogen sulfide Gas sensor Sensitivity detection Selectivity Band gap
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马桶冲水行为与微生物气溶胶传播 认领 引用 被引量：9
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作者 毛怡心 丁培 孙宗科 《微生物学报》 CAS CSCD 北大核心 2018年第12期2070-2077,共8页
有关卫生间马桶冲水行为可能产生的微生物气溶胶扩散与病原微生物传播的情况一直受到广泛关注,相关研究或报道时有出现。本文意在总结与马桶冲水行为产生的生物气溶胶相关的研究及进展,讨论马桶冲水行为、开关马桶盖冲水行为以及马桶表... 有关卫生间马桶冲水行为可能产生的微生物气溶胶扩散与病原微生物传播的情况一直受到广泛关注,相关研究或报道时有出现。本文意在总结与马桶冲水行为产生的生物气溶胶相关的研究及进展,讨论马桶冲水行为、开关马桶盖冲水行为以及马桶表面等因素在病毒、细菌及寄生虫等病原微生物通过生物气溶胶进行传播的过程中起到的作用。此外,本文还探讨了与马桶相关的微生物气溶胶的产生可能为人体健康带来的潜在健康风险,并就公众健康防护以及未来研究方向提出建议。 展开更多
关键词 卫生间 气溶胶 空气传播 病原微生物 室内公共场所
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空调启动后板房室内温变特性的实验研究 认领 引用 被引量：1
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作者 王梦伟 梁伟杰 +1 位作者 丁佩 龙恩深 《供热制冷》 2018年第9期60-64,共5页
间歇空调开机阶段建筑室内的温度变化会影响室内的热舒适性。空调开机阶段房间室内温度变化不仅与房间围护结构特性等多种因素有关,而且与使用的空调末端送风方式、室外环境有关。通过实验的方法对比研究了板房冬夏两季室内的温变特性,... 间歇空调开机阶段建筑室内的温度变化会影响室内的热舒适性。空调开机阶段房间室内温度变化不仅与房间围护结构特性等多种因素有关,而且与使用的空调末端送风方式、室外环境有关。通过实验的方法对比研究了板房冬夏两季室内的温变特性,以及冬季板房在不同的空调送风方式和外扰作用下,空调开机阶段室内的温度变化规律。 展开更多
关键词 温变指数 开机阶段 室内温度
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流域蒸散与地理坐标的关系--以中国云南南盘江流域为例 认领 引用
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作者 刘干 余航 +4 位作者 胡凤林 潘梦楠 裴鼎 王绍春 王龙 《水力发电》 CAS 2024年第5期7-15,58,共9页
以中国云南南盘江为研究区,利用1980年~2016年32个雨量站的降水数据、21个蒸发站的蒸发量数据和13个水文站的流量数据,基于Budyko-Fu方程,分析了流域蒸发量及敏感性与地理坐标的关系。结果表明:南盘江流域AET与纬度和海拔间呈显著负相关... 以中国云南南盘江为研究区,利用1980年~2016年32个雨量站的降水数据、21个蒸发站的蒸发量数据和13个水文站的流量数据,基于Budyko-Fu方程,分析了流域蒸发量及敏感性与地理坐标的关系。结果表明:南盘江流域AET与纬度和海拔间呈显著负相关,相关系数分别为R=-0.8607(α<0.01)和R=-0.6003(α<0.05),且PET与纬度的关系与其一致;13个子流域的流域特征值m均与经度、纬度、海拔呈负相关,m值同时受到了经度、纬度、海拔的影响,其中m值与纬度和海拔的关系密切,相关系数分别为R=-0.8885(α<0.01)、R=-0.6224(α<0.05);实际蒸发量和蒸散率对m的敏感性均与纬度存在线性相关关系,相关系数分别为R=0.8476(α<0.01)、R=0.5222(α<0.1),且位于流域西部11个子流域的实际蒸发量、蒸散率对干燥度的敏感性和纬度之间具有2次多项式的非线性关系,降水的空间分布影响了实际蒸发量和蒸散率对干燥度的敏感性空间分布。 展开更多
关键词 实际蒸发量 敏感性 蒸散率 流域特征值 南盘江流域
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Filtration efficiency of face masks against aerosolized surrogate SARS-CoV-2 at different social distances 认领 引用 被引量：2
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作者 Song Tang Xia Li +13 位作者 Pei Ding Yixin Mao Fuchang Deng Yu’e Cha Siqi Zhuang Cheng Ding Jiao Wang Youbin Wang Xiaoning Zhao Rachael M.Jones Biao Kan C.Raina MacIntyre Dongqun Xu Xiaoming Shi 《Science Bulletin》 SCIE EI CAS CSCD 2022年第6期565-568,共4页
The coronavirus disease 2019(COVID-19)pandemic is an unpreedented global event.It has become clear that COVID-19 is transmitted by virus-containing droplets(>5μm)and aerosols(<5μm),and that all human exhalator... The coronavirus disease 2019(COVID-19)pandemic is an unpreedented global event.It has become clear that COVID-19 is transmitted by virus-containing droplets(>5μm)and aerosols(<5μm),and that all human exhalatory activities(e.g.,breathing,speaking,singing,shouting,coughing,and sneezing)result in the emission of suspended droplets/aerosols of various sizes.As an example,COVID-19 patients exhale millions of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)RNA copies into the air per hour[1].SARS-CoV-2-laden aerosols play a profound role in disease transmission,as they can linger and remain viable in the air for a long duration(~16 h)[2]and travel a long distance(~4.8 m)due to their smaller size[3]. 展开更多
关键词 过滤效率 气溶胶 替代物
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Independent and Interactive Effects of Environmental Conditions on Aerosolized Surrogate SARS-CoV-2-Beijing,China,June to September 2020 认领 引用
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作者 Yixin Mao Yueyun Luo +12 位作者 Wenda Zhang Pei Ding Xia Li Fuchang Deng Kaiqiang Xu Min Hou Cheng Ding Youbin Wang Zhaomin Dong Raina MacIntyre Xiaoyuan Yao Song Tang Dongqun Xu 《China CDC weekly》 SCIE CSCD 2022年第26期565-569,I0004,I0005,共5页
Summary What is already known about this topic?Environmental factors such as temperature and humidity play important roles in the transmission of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)via droplets... Summary What is already known about this topic?Environmental factors such as temperature and humidity play important roles in the transmission of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)via droplets/aerosols.What is added by this report?Higher relative humidity(61%–80%),longer spreading time(120 min),and greater dispersal distance(1 m)significantly reduced SARS-CoV-2 pseudovirus loads.There was an interaction effect between relative humidity and spreading time.What are the implications for public health practice?The findings contribute to our understanding of the impact of environmental factors on the transmission of SARS-CoV-2 via airborne droplets/aerosols. 展开更多
关键词 humidity finding interaction
Improvements in energy saving and thermal comfort for electric vehicles in summer through coupled electrochromic and radiative cooling smart windows 认领 引用 被引量：5
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作者 Zhoujie Duan Shuangdui Wu +5 位作者 Hongli Sun Borong Lin Pei Ding Tao Cui Jeremy To Xi Zhang 《Building Simulation》 SCIE EI CSCD 2024年第8期1231-1251,共21页
In hot climates,the large amount of cooling load in electric vehicle(EV)results in a lot of battery energy consumption,leading the decrease of driving range.With the widespread application of windows in EV,the electro... In hot climates,the large amount of cooling load in electric vehicle(EV)results in a lot of battery energy consumption,leading the decrease of driving range.With the widespread application of windows in EV,the electrochromic glass(EC)shows great prospect in lowering the cooling load.However,researches on the application of EC in EV lack the consideration of both passive cooling measures and passenger comfort,which limits the further application of EC.In this paper,we proposed an idea combining the novel techniques of both electrochromism and radiative cooling.Computational fluid dynamics(CFD)is modeled to simulate the application of electrochromic and radiative cooling coupled smart windows in hot parking conditions,exploring the improvement effect of the window on the thermal environment,comfort and energy saving of the EV.The results indicate that,under the intense sunlight with an outdoor temperature of 33℃,activating the air conditioning to maintain an average interior temperature of 26℃,the coupled windows reduced the cooling capacity of the air conditioning by 762 W compared to regular windows,which can further increase the range of EV.Meanwhile,compared to simple electrochromic fully colored glass,the integration of radiative cooling technology can lower the window surface temperature by up to 10.7℃.Moreover,compared to regular windows,the coupled windows lowered the standard effective temperature(SET*)for passengers by approximately 7℃,significantly improving comfort.These research findings are expected to provide guidance for optimizing window design and enhancing the performance of EV. 展开更多
关键词 electrochromism radiative cooling smart windowel ectric vehicle cabin thermal comfort energy saving
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