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Metasurface-assisted low-frequency performance enhancement of ultra-broadband honeycomb absorber based on carbon nanotubes

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Nano Research 2024年第9期17卷 8542-8551页

作者： Cai-Liang wang Shuang Bai Pei-Yan Zhao Tao Zhou hui-Ya wang jun-Peng wang Luo-Xin wang Guang-Sheng wang School of Chemistry Beihang UniversityBeijing 100191China Aerospace Science and Industry Corporation of Wuhan Magnetoelectricity Co. Ltd.Wuhan 430070China College of Materials Science and Engineering Key Laboratory for New Textile Materials and Applications of Hubei ProvinceWuhan Textile UniversityWuhan 430200China School of Chemistry and Chemical Engineering Lingnan Normal UniversityZhanjiang 524048China School of Materials Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China

Here,we present a unique method to enhance the low-frequency absorption performance of a honeycomb absorber by integrating a *** geometrical dimensions of the proposed metasurface have been numerically *** introduction of the metasurface allows exploitation of its robust resonance and superior impedance matching in low-frequency bands,thereby improving microwave absorption *** incorporation of the metasurface does not impact the wave transmission performance of the honeycomb core absorber at high-frequency band,thus preserving its high-frequency *** broadens the absorption range,leading to an expanded *** results reveal that the composite absorber(CA)exhibits strong absorption performance with an incident angle stability up to 45°for both transverse electric(TE)and transverse magnetic(TM)*** absorption mechanism of the CA has been investigated by using an equivalent circuit model and electromagnetic field analysis.A prototype was designed,fabricated,and tested to validate the proposed *** simulation and measurement results demonstrate that the prototype can achieve an average absorption rate exceeding 90%across a 1.0-18.0 GHz *** study introduces an innovative technique for creating microwave absorbers for low-frequency wideband applications.

关键词： low frequency metasurface radar absorption impedance matching

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Greenland Ice Sheet Elevation Change in Winter and Influence of Atmospheric Teleconnections in the Northern Hemisphere

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Atmospheric and Oceanic Science Letters 2009年第6期2卷 376-380页

作者： CHEN Lin-Ling Ola M. JOHANNESSEN Kirill KHVOROSTOVSKY wang hui-jun Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Climate Change Research Center Institute of A tmospherie Physics Chinese Academy of Sciences Beijing 100029 China Nansen Environmental and Remote Sensing Center Bergen 5006 Norway Nansen Scientific Society Bergen 5006 Norway

The relationship between the variability of the surface elevation of the Greenland Ice Sheet (GIS) in winter and sea level pressure is identified through analysis of data from satellite-borne radar altimeters, together with meteorological data fields during 1993 2005. We found that both the North Pacific Oscillation (NPO) and the North Atlantic Oscillation (NAO), the two major teleconnection patterns of the atmospheric surface pressure fields in the Northern Hemisphere, significantly influence the GIS winter elevation change. Further, it is suggested that the NPO may affect the GIS accumulation by influencing the NAO, particularly by changing the intensity and location of the Icelandic Low.

关键词： Greenland ice sheet North Pacific Oscillation North Atlantic Oscillation atmospheric teleconnection patterns

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Phase field modeling of grain stability of nanocrystalline alloys by explicitly incorporating mismatch strain

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Rare Metals 2024年第7期43卷 3370-3382页

作者： Min Zhou Hong-hui Wu Yuan Wu hui wang Xiong-jun Liu Sui-He Jiang Xiao-Bin Zhang Zhao-Ping Lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083Cnina Institute for Carbon Neutrality University of Science and TechnologyBeijing 100083China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China

Ab st ra ct Nanocrystalline materials exhibit unique properties due to their extremely high grain boundary(GB) ***,this high-density characteristic induces grain coarsening at elevated temperatures,thereby limiting the widespread application of nanocrystalline *** experimental observations revealed that GB segregation and second-phase pinning effectively hinder GB migration,thereby improving the stability of nanocry stalline *** this study,a mouified phase-field model that integrates mismatch strain,solute segregation and precipitation was developed to evaluate the influence of lattice misfit on the thermal stability of nanocrystalline *** simulation results indicated that introducing a suitable mismatch strain can effectively enhance the microstructural stability of nanocrystalline *** synergizing precipitation with an appropriate lattice misfit,the formation of second-phase particles in the bulk grains can be suppressed,thereby facilitating solute segregation/precipitation at the *** concentrated solute segregation and precipitation at the GBs effectively hinders grain migration,thereby preventing grain *** findings provide a new perspective on the design and regulation of nanocrystalline alloys with enhanced thermal stability.

关键词： Phase field model Mismatch strain Second-phase precipitation Grain boundary segregation Nanocrystalline alloys

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Benefit evaluation of the Three-Gorges Reservoir migration by an assessment index model based on analytic hierarchy process

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Journal of Chongqing University 2007年第2期6卷 100-106页

作者： wang jun-hui GAN Lian-jun School of Management Chongqing Normal University Chongqing 400047 P.R. China School of Economics ＆ Business Administration Chongqing University Chongqing 400044 P.R. China

An assessment index model was established to evaulate the benefit of the Three-Gorges Reservoir migration through the analytical hierarchy process. Totally 43 indicators were selected to assess the impact of migration on the economic, social and ecological environmental aspects of the migration communities, with the data of the indicators of the years 1992, 1998, 2002 which represented the period of premigration, the end of the first phase migration and the end of the second phase migration, respectively. The evaluation matrix is sufficiently consistent, with a consistency ratio CR equal to 0.086 3. The assessment turned out a benefit value for the economic subsystem in the year 2004 larger than triple the value in the year 1992, indicating a remarkable economic growth in the Reservoir area. The constantly increasing value for the social subsystem reflects the stable social situations. There is a slight decline in the assessment outcome of the ecological subsystem for the year 1998, which implies enviromental conservation was given insufficient importance during that period. On the whole, the implementation of the migration project is favorable to the Reservoir region, as confirmed by the stably increasing overall evaluation value from 42.22% in 1992 to 68.81% in 2002. However, there is still much room to improve from the status quo to the target criteria.

关键词： Three-Gorges Reservoir migration benefit index system comprehensive assessment

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Light People:Professor Laura Na Liu

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Light(Science & Applications) 2024年第2期13卷 184-189页

作者： hui wang Cun Yu Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of Sciences130033ChangchunChina

Editorial The DNA nanotechnology outlines a new chapter in biological sciences,opening a new era of scientific and technological advancements.A pioneer of DNA nanotechnology,Professor Liu from the University of Stuttgart in Germany,our latest Light People,has been working at the interface,where nanophotonics meets biology and *** the path of scientific explorations.

关键词： chemistry. advancement pioneer

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Enhanced hydrogen evolution reaction in FePt film with remanence due to decrease in domain walls

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Rare Metals 2024年第3期43卷 1108-1115页

作者： Hong Hong Dong-Xue Liu jun Li jun-Ming Li Li-Qian Wu Bo Yang Qing-Qi Cao Dun-hui wang National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced MicrostructuresJiangsu Provincial Key Laboratory for NanotechnologySchool of PhysicsNanjing UniversityNanjing210093China Hangzhou Dianzi University Hangzhou310018China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang110819China

As an effective strategy to improve the properties of electrocatalysts,magnetic field-assisted electrocatalytic water splitting has attracted increasing attention ***,the corresponding enhancements mostly depend on the exertion of an external magnetic field during electrochemical reactions,which results in a high cost of industrial production,and makes the magnetic field manipulation of electrocatalysis become a challenging *** this work,instead of the external magnetic field,a bias magnetic field is self-supplied by the remanence state of a ferromagnetic electrocatalyst of *** to the assistance of this bias magnetic field,the FePt film in the remanence state shows the overpotential of 229 mV during hydrogen evolution reaction,which is much lower than that in its demagnetization state(283 mV).Our findings demonstrate that the remanence in ferromagnetic electrocatalysts can improve the catalytic performance,which is attributed to the decrease in domain walls.

关键词： Remanence Magnetic domains Electrocatalysis Hydrogen evolution reaction(HER)

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Light People:Professor Manijeh Razeghi

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Light(Science & Applications) 2024年第8期13卷 1451-1462页

作者： hui wang Cun Yu Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

The sense of light is the first sensation the human body *** importance of light is ***,we all know that the light we can see and perceive covers only a small section of the ***,for Light People,we feature a researcher who is committed to exploring different spectral bands of light ranging from deep ultraviolet to terahertz waves and working on quantum semiconductor technology,*** Razeghi of the Northwestern University in the United *** for her quick thinking and witty remarks,*** is passionate about life and always kind to *** a scientist,she does not limit her research to a single focus,instead,she works on the entire process from material selection,device design,processing,and manufacturing,all the way to product *** has a strong passion for education,a commitment unwavered by fame or *** her students,she is both a reliable source of knowledge and a motherly figure with a caring *** firmly believes that all things in nature can give her energy and *** science,she is a true“pioneer”in research and a“miner”of scientific *** advises young scientists to enjoy and love what they do,and turn their research into their *** a female scientist,she calls on all women to realize their true value and ***,let’s hear from Professor Manijeh Razeghi,a true star who radiates energy and light.

关键词： mother instead passion

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Original article：A new diagnostic algorithm for vascular cognitive impairment： the proposed criteria and evaluation of its reliability and validity

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Chinese Medical Journal 2010年第3期 311-319页

作者： ZHAO Qian-lu ZHOU Yong wang Yi-long DONG Ke-hui wang Yong-jun Department of Neurology Beijing Tiantan Hospital Capital Medical University Beijing 100050 China

Background Vascular cognitive impairment （VCI） is considered to be the most common pattern of cognitive impairment. We aimed to devise a diagnostic algorithm for VCI, and evaluate the reliability and validity of our proposed criteria. Methods We based our new algorithm on previous literature, a Delphi consensus method, and preliminary testing. First, successive 100 patients with cerebrovascular disease （CVD） in hospital underwent a structured medical examination. Twenty-five case vignettes fulfilled the proposed criteria of diagnosis for probable or possible VCI were divided into three subtype categories： vascular cognitive impairment, no dementia （VCIND）, vascular dementia （VaD） or mixed VCI/Alzheimer＇s disease （AD）. Inter-raters reliability was assessed using a Fleiss kappa analysis. Convergent validity was also evaluated by correlation coefficients （r） between the proposed key points for each subtype and the currently accepted criteria. Forty-five patients with probable VCI were examined to determine the accuracy of identification for each subtype. Results The proposed criteria showed clinical diagnostic validity for VCI, and were able to define probable, possible and definite VCI, three VCI subtypes, and vascular causes. There was good consensus between experts （Cronbach＇s a=0.96 for both rounds）. Significant moderate to good items-total correlations were found for two questionnaires （50-r range, 0.40-0.97 and 0.41-0.99, respectively）. Significant slight and moderate inter-raters reliability were obtained for VCI （k=0.13） and three VCI subtypes （k=0.45）. Furthermore, good convergent validity was observed in a comparison of significant correlations between criteria： good （4-r range, 0.75-0.92） to perfect （3-r=1.00） validity for the VCIND subtype, and moderate to good validity for the VaD subtype （1-r=0.46; 5-r range, 0.76-0.92） and for the mixed VCI/AD subtype （r=0.92 and 1.00; 4-r range, 0.47-0.70）. Importantly, the area under receiver operating characteristic （

关键词： criteria vascular cognitive impairment subtype cerebrovascular disease validity

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Ground state of Rydberg-dressed Bose gas confined in a toroidal trap

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Communications in Theoretical Physics 2024年第1期76卷 29-35页

作者： Lin-Xue wang Hong-Li Yang hui Liu Si-Lin Chen Ya-jun wang Xiao-Fei Zhang Department of Physics School of Physics and Information ScienceShaanxi University of Science and TechnologyXi'an 710021China Department of Basic Sciences Air Force Engineering UniversityXi'an 710051China

The experimental realization of Rydberg dressing technology in ultracold atomic systems provides another superior platform for studying novel states of matter and macroscopic quantum *** this work,based on the mean-field theory,we have investigated the ground-state phases of a two-component Bose–Einstein condensate with Rydberg interaction and confined in a toroidal *** effects of the Rydberg interaction and external potential,especially the Rydberg blockade radius,on the ground-state structure of such a system have been investigated in full parameter *** results show that the Rydberg blockade radius,which can be regarded as another controllable parameter,can be used to obtain a variety of ground-state *** interestingly,it is found that for weak Rydberg interactions,the Rydberg blockade radius breaks the spontaneous rotational symmetry of the system,leading to the formation of a discrete unit cell *** strongly interacting cases,it can be used to realize different orders of discrete rotational symmetry breaking.

关键词： Bose-Einstein condensate Rydberg dressing toroidal trap

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THE　SENSITIVITIES　OF　THE　AGCM　TO　THE　SOLAR　CONSTANT　CHANGE　AND　GEOGRAPHICALLY　VARYING　SSTA

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中国科学院大学学报 1994年第1期 45-54页

作者： wang hui-jun (LASG, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing 100080)

ＴＨＥＳＥＮＳＩＴＩＶＩＴＩＥＳＯＦＴＨＥＡＧＣＭＴＯＴＨＥＳＯＬＡＲＣＯＮＳＴＡＮＴＣＨＡＮＧＥＡＮＤＧＥＯＧＲＡＰＨＩＣＡＬＬＹＶＡＲＹＩＮＧＳＳＴＡ￥ＷａｎｇＨｕｉ－ｊｕｎ（ＬＡＳＧ，ＩｎｓｔｉｔｕｔｅｏｆＡｔ... 详细信息

ＴＨＥＳＥＮＳＩＴＩＶＩＴＩＥＳＯＦＴＨＥＡＧＣＭＴＯＴＨＥＳＯＬＡＲＣＯＮＳＴＡＮＴＣＨＡＮＧＥＡＮＤＧＥＯＧＲＡＰＨＩＣＡＬＬＹＶＡＲＹＩＮＧＳＳＴＡ￥ＷａｎｇＨｕｉ－ｊｕｎ（ＬＡＳＧ，ＩｎｓｔｉｔｕｔｅｏｆＡｔｍｏｓｐｈｅｒｉｃＰｈｙｓｉｃｓ，...

关键词： solar constant sea surface temperature anomaly climatic effect

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