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Graphene Aerogel Composites with Self‑Organized Nanowires‑Packed Honeycomb Structure for Highly Efficient Electromagnetic Wave Absorption

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Nano-Micro Letters 2025年第2期17卷 533-547页

作者： Xiao You Huiying Ouyang Ruixiang Deng Qiuqi Zhang Zhenzhong Xing Xiaowu Chen Qingliang shan Jinshan Yang Shaoming Dong State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050People’s Republic of China Key Laboratory of Inorganic Coating Materials CAS Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050People’s Republic of China Structural Ceramics and Composites Engineering Research Center Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050People’s Republic of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049People’s Republic of China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210People’s Republic of China School of Materials Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018People’s Republic of China university of Chinese Academy of Sciences Beijing 100039People’s Republic of China

With vigorous developments in nanotechnology,the elaborate regulation of microstructure shows attractive potential in the design of electromagnetic wave ***,a hierarchical porous structure and composite heterogeneous interface are constructed successfully to optimize the electromagnetic loss *** macro–micro-synergistic graphene aerogel formed by the ice template‑assisted 3D printing strategy is cut by silicon carbide nanowires(SiC_(nws))grown in situ,while boron nitride(BN)interfacial structure is introduced on graphene *** unique composite structure forces multiple scattering of incident EMWs,ensuring the combined effects of interfacial polarization,conduction networks,and magnetic-dielectric ***,the as-prepared composites present a minimum reflection loss value of−37.8 dB and a wide effective absorption bandwidth(EAB)of 9.2 GHz(from 8.8 to 18.0 GHz)at 2.5 ***,relying on the intrinsic high-temperature resistance of SiC_(nws) and BN,the EAB also remains above 5.0 GHz after annealing in air environment at 600℃ for 10 h.

关键词： Hierarchical porous structure Interface High-temperature resistance Graphene aerogel composites Electromagnetic wave absorption

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Stochastic Perturbations of Fat Solenoidal Attractors

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Acta Mathematica Sinica,English Series 2010年第5期26卷 923-936页

作者： yah ZHENG Department of Mathematics National University of Defense Technology Changsha 410073 P. R. China

In this article stochastic perturbations of a class of fat solenoidal attractors are considered. We show the robustness of their invariant densities and rates of mixing under the stochastic perturbations by investigat... 详细信息

关键词： fat solenoidal attractors stochastic perturbations Sinai-Ruelle-Bowen measures

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GRB jet beaming angle statistics

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Research in Astronomy and Astrophysics 2010年第2期10卷 142-150页

作者： yah Gao Zi-Gao Dai Department of Astronomy Nanjing University Nanjing 210093 China

Existing theory and models suggest that a Type I （merger） GRB should have a larger jet beaming angle than a Type II （collapsar） GRB, but so far no statistical evidence is available to support this suggestion. In this paper, we obtain a sample of 37 beaming angles and calculate the probability that this is true. A correction is also devised to account for the scarcity of Type I GRBs in our sample. The probability is calculated to be 83% without the correction and 71% with it.

关键词： gamma rays: bursts -- ISM: jets and outflows -- methods: statistical

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Embedding generalized of circulant graphs and Petersen graphs on projective plane

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Frontiers of Mathematics in China 2015年第1期10卷 209-220页

作者： yah YANG Yanpei LIU Department of Mathematics Tianjin University Tianjin 300072 China Department of Mathematics Beijing Jiaotong University Beijing 100044 China

Both the circulant graph and the generalized Petersen graph are important types of graphs in graph theory. In this paper, the structures of embeddings of circulant graph C（2n ＋ 1; {1, n}） on the projective plane are described, the number of embeddings of C（2n ＋ 1; {1, n}） on the projective plane follows, then the number of embeddings of the generalized Petersen graph P（2n ＋ 1, n） on the projective plane is deduced from that of C（2n ＋ 1; {1, n}）, because C（2n ＋ 1; {1, n}） is a minor of P（2n ＋ 1, n）, their structures of embeddings have relations. In the same way, the number of embeddings of the generalized Petersen graph P（2n, 2） on the projective plane is also obtained.

关键词： Embedding joint tree circulant graph generalized Petersen graph,projective plane

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Constructions of optimal variable-weight OOCs via quadratic residues

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Frontiers of Mathematics in China 2013年第4期8卷 869-890页

作者： yah LIU Dianhua WU Department of Mathematics Guangxi Normal University Guilin 541004 China

Variable-weight optical orthogonal code （OOC） was introduced by G. C. Yang [IEEE Trans. Commun., 1996, 44： 47-55] for multimedia optical CDMA systems with multiple quality of service （QoS） requirements. In this p... 详细信息

关键词： Cyclic packing optical orthogonal code (OOC) quadratic residue relative difference family variable-weight OOC

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Influence of an emulsifier on the pressure desensitization of emulsion explosives

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Journal of university of Science and Technology Beijing 2006年第2期13卷 102-107页

作者： Yinjun Wang Xuguang Wang Shilong yah Civil ＆ Environmental Engineering School University of Science and Technology Beijing Beijing 100083 China Beijing General Research Institute of Mining and Metallurgy Beijing 100044 China Chemical Engineering Department Anhui University of Science and Technology Anhui 232001 China

The desensitization degree of emulsion explosives （EE） was calculated with the peak pressure of explosion shock waves tested in water. To an explosive, the less the desensitization degree, the better the compression resistance, so the compression resistance of an explosive can be compared and analyzed quantificationally with the desensitization degree. The influence of an emulsifier on the pressure desensitization of EE was studied, including the content and category of emulsifiers. Three kinds of emulsifiers （Span-80, compound emulsifier, and T-152） were used in the tests. The experimental results show that both the content and category of emulsifiers make a great effect on the pressure desensitization of EE. The desensitization degree of EE reduces with the emulsifier content being increased, but there is an optimal content of an emulsifier for the compression resistance of EE. While the content of Span-80 reaches 4wt%, the desensitization degree of EE becomes a minimal value, and augments somewhat if the emulsifier content is increased more. That is to say, the compression resistance of EE becomes the highest while the content of Span-80 is 4wt%, and the compression resistance will decline if the content of Span-80 is increased more. The compression resistance of the explosive emulsified by compound emulsifier is the highest among all the explosives, when the content of the whole components and manufacturing engineering are kept invariable.

关键词： emulsion explosive emulsifier pressure desensitization shock wave compression resistance

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Adaptive control for autonomous rendezvous of spacecraft on elliptical orbit

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Acta Mechanica Sinica 2009年第4期25卷 539-545页

作者： shan Lu Shijie Xu School of Astronautics, Beihang university,100191 Beijing, China School of Astronautics Beihang University Beijing China

A strategy for spacecraft autonomous rendezvous on an elliptical orbit in situation of no orbit information is developed. Lawden equation is used to describe relative motion of two spacecraft. Then an adaptive gain factor is introduced, and an adaptive control law for auton- omous rendezvous on the elliptical orbit is designed using Lyapunov approach. The relative motion is proved to be ultimately bounded under this control law, and the final relative position error can achieve the expected magnitude. Simulation results indicate that the adaptive control law can realize autonomous rendezvous on the elliptical orbit with relative state information only.

关键词： Autonomous rendezvous Elliptical orbit Lyapunov approach Adaptive control Gain factor

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Topological Fulde-Ferrell and Larkin-Ovchinnikov states in spin-orbit-coupled lattice system

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Frontiers of physics 2018年第2期13卷 193-200页

作者： Yao-Wu Guo yah Chen Department of Physics and State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China

The spin-orbit coupled lattice system under Zeeman fields provides an ideal platform to realize exotic pairing states. Notable examples range from the topological superfluid/superconducting （tSC） state, which is gapped in the bulk but metallic at the edge, to the Fulde-Ferrell （FF） state （having a phase-modulated order parameter with a uniform amplitude） and the Larkin-Ovchinnikov （LO） state （having a spatially varying order parameter amplitude）. Here, we show that the topological FF state with Chern number （C = -1）（tFF1） and topological LO state with C = 2 （tLO2） can be stabilized in Rashba spin-orbit coupled lattice systems in the presence of both in-plane and out-of-plane Zeeman fields. Besides the inhomogeneous tSC states, in the presence of a weak in-plane Zeeman field, two topological BCS phases may emerge with C = -1 （tBCS1） far from half fining and C = 2 （tBCS2） near half filling. We show intriguing effects such as different spatial profiles of order parameters for FF and LO states, the topological evolution among inhomogeneous tSC states, and different non-trivial Chern numbers for the tFF1 and tLO1,2 states, which are peculiar to the lattice system. Global phase diagrams for various topological phases are presented for both half-rifling and doped cases. The edge states as well as local density of states spectra are calculated for tSC states in a 2D strip.

关键词： topological superfluid Fulde-Ferrell (FF) state

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Inducible effects of icariin,icaritin,and desmethylicaritin on directional differentiation of embryonic stem cells into cardiomyocytes in vitro

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Acta Pharmacologica Sinica 2005年第4期26卷 477-485页

作者： Dan-yah ZHU Yi-jia LOU~2 Department of Pharmacology and Toxicology,College of Pharmaceutical Scienees,Zhejiang university,Hangzhou 310031,China Department of Pharmacology and Toxicology College of Pharmaceutical Sciences Zhejiang University Hangzhou China

Aim:To investigate the possible inducible effects of icariin,icaritin,anddesmethylicaritin on the directional differentiation of embryonic stem(ES)cellsinto cardiomyocytes in ***:ES cells were cultivated as embryoidbodies(EBs)in hanging drops with icariin,icaritin,or *** cellstreated with retinoic acid and with solvent were used as positive and negativecontrols,*** cardiomyocytes derived from the ES cells were veri-fied using *** expression of cardiac developmental-dependent genes was detected using the reverse transcription-polymerase chainreaction(RT-PCR)*** cycle distribution and apoptosis were analyzedusing flow cytometry to determine the partly inducible effect mechanisms ***:The total percentage of beating EBs treated with 1×10-7mol/L icariin,icaritin,or desmethylicaritin was 87%(P<0.01),59%(P<0.01),and 49%,*** the beating cardiomyocytes derived from the ES cells expressed cardiac-specific proteins for α-actinin and troponin *** them,1×10-7mol/L icariintreatment resulted in a significantly advanced and increased mRNA level ofα-cardiac myosin heavy chain(MHC)and myosin light chain 2v(MLC-2v)in EBsin the early cardiac developmental *** shifting to the cardiomyocytephenotype,icariin could evoke the accumulation of ES cells in G0/G1and acceler-ate apoptosis of the cell population(P<0.05).Conclusion:Icariin facilitated thedirectional differentiation of ES cells into cardiomyocytes at a concentration of1×10-7mol/*** promoting effect of icariin on cardiac differentiation was relatedto increasing and accelerating gene expression of a-cardiac MHC and MLC-2v,aswell as regulating the cell cycles and inducing apoptosis.

关键词： embryonic stein cells directional differentiation cardiomyocytes icariin icaritin desmethylicaritin myosin heavy chain myosin light chain 2 cell cycle apoptosis

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Parameter Estimates in Random Intercept Mixed Effects Model for Repeated Measures

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Acta Mathematica Sinica,English Series 2007年第4期23卷 685-696页

作者： yah SUN Gen Xiang CHAI School of Economics Shanghai University of Finance and Economics Shanghai 200433 P. R. China Department of Applied Mathematics Tongji University Shanghai 200092 P. R. China

In this article the following random intercept mixed effects model will be considered： yij = vi =v^τijβ＋ εij,i=1,…,m;j=1,2,…,ni, where {vi} are i.i.d, random effects with mean α 2. 2 and finite variance σ^2 v, {εij} are i.i.d, random errors with finite variance ε^2 ε. Here we will estimate α,σ^2 v,σ^2 ε,β and study their large sample properties, such as strong consistency, strong convergence rates and asymptotic normality.

关键词： Repeated measures Random effects Convergence system Strong convergence Strong convergence rate

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