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Recent development of thermoelectric nanofibers and their composites

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Journal of Materiomics 2023年第1期9卷 99-130页

作者： Yong X.gan Department of Mechanical Engineering California State Polytechnic University Pomona3801 W Temple AvenuePomonaCA 91768USA

This review deals with the recent development of thermoelectric(TE)nanofibers and their composite *** processing and manufacturing technologies for preparing nanofibers are ***,electrospinning,electrochemical oxidation,and liquid phase chemical deposition approaches are *** kinds of TE nanofibers are introduced *** important inorganic and organic nanofibers including carbon-based nanofibers,conducting polymer-based nanofibers,and transition metal oxide-based nanofibers with significant thermoelectric responses are *** properties of some important nanofibers are *** applications of TE nanofibers for energy conversion,thermal imaging and temperature sensing are *** and concluding remarks are presented.

关键词： Thermoelectricity Nanofibers and composites Processing and manufacturing Energy conversion Thermal imaging Temperature sensing

The Structure of Vector Bundles on Non-primary Hopf Manifolds

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Chinese Annals of Mathematics,Series B 2020年第6期41卷 929-938页

作者： Ning gan Xiangyu ZHOU School of Sciences Jimei Uni vers计yXiamen 361021FujianChina Institute of Mathematics Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China

Let X be a Hopf manifold with non-Abelian fundamental group and E be a holomorphic vector bundle over X,with trivial pull-back to C^n-{0}.The authors show that there exists a line bundle L over X such that E■L has a nowhere vanishing *** is proved that in case dim(X)≥3,π*(E)is trivial if and only if E is filtrable by vector *** the structure theorem,the authors get the cohomology dimension of holomorphic bundle E over X with trivial pull-back and the vanishing of Chern class of E.

关键词： Hopf manifolds Holomorphic vector bundles Exact sequence Cohomology Filtration Chern class

Space Solar Physics in China

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空间科学学报 2018年第5期38卷 662-664页

作者： gan Weiqun FAN Quanlin Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of Sciences National Space Science Center Chinese Academy of Sciences

The activities of Chinese space solar physics in 2016–2018 can be divided into two categories: prestudy projects and mission-level projects. Both projects were undertaken smoothly. Especially the ASO-S,after several years' promotion, finally got formal approval at the end of 2017. This paper describes in brief the status of all related projects.

关键词：物理太阳空间中国工程

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Pervoskite-type ***0.1Fe0.9O3-δ as Intermediate-Temperature Solid Oxide Fuel Cell Cathode

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Chinese Journal of Chemical Physics 2012年第5期25卷 605-608,I0004页

作者： Yun gan Kui Xie Department of Energy Materials School of Materials Science and EngineerinEHefei University ofTechnologyHefei 230009China

A cobalt-free perovskite-type Ba0.5Sr0.5A10.1Fe0.9O3-δ （BSAF） chemically studied as solid oxide fuel cell （SOFC） cathode. The ductivity, and electrode polarizations in symmetrical cell based is developed and electro- structures, electrical con- on mixed ion conducting electrolyte were investigated, respectively. The temperature dependence of conductivity of BSAF in air shows a typical semiconductor behavior with positive temperature coefficient up to 450℃ where the conductivity reaches 14.0 S/cm while above this temperature the negative temperature coefficient dominates the total conductivity. Electrochemical charac- terizations show desirable polarization resistance of BSAF cathode in a symmetric cell based on mixed ion conducting electrolyte at 650-700℃, A single SOFC with BSAF cathode shows OCV of 1.0 V and maximum output of 420 mW/cm2 at 700 ℃ with humidified hydrogen fuel and static air oxidant.

关键词： Solid oxide fuel cell Perovskite Cathode Cobalt-free Mixed ionic conductor

Progress Report on ASO-S: 2022–2024

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空间科学学报 2024年第4期44卷 687-689页

作者： gan Weiqun Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023

The Advanced Space-based Solar Observatory(ASO-S)marked China's first comprehensive solar mission in *** upon the previous reports covering 2018-2020 and 2020-2022,we present here an update on the ASO-S made from 2022 to *** August 2022,ASO-S completed its Phase D study and was successfully launched on October 9,*** commissioning phase was carried out and concluded within the first nine months following the *** data and associated analysis software have been opened to the community and the research on the early ASO-S data has been well *** anticipate also the achievements in data research pertaining to ASO-S in the near future.

关键词： Space astronomy Solar physics Spacecraft

Supercooled liquids analogous fractional Stokes–Einstein relation in NaCl solution above room temperature

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Chinese Physics B 2019年第7期28卷 381-388页

作者： gan Ren Shikai Tian Departments of Physics & Key Laboratory of Photonic and Optical Detection in Civil Aviation Civil Aviation Flight University of China

The Stokes–Einstein relation D^T/η and its two variants D~τ-1 and D^T/τ follow a fractional form in supercooled liquids, where D is the diffusion constant, T the temperature,η the shear viscosity, and τ the structural relaxation *** fractional Stokes–Einstein relation is proposed to result from the dynamic heterogeneity of supercooled *** this work, by performing molecular dynamics simulations, we show that the analogous fractional form also exists in sodium chloride(NaCl) solutions above room temperature.D~τ-1 takes a fractional form within 300–800 K;a crossover is observed in both D^T/τ and D^T/η.Both D^T/τ and D^T/η are valid below the crossover temperature Tx,but take a fractional form for T > *** results indicate that the fractional Stokes–Einstein relation not only exists in supercooled liquids but also exists in NaCl solutions at high enough temperatures far away from the glass transition *** propose that D^T/η and its two variants should be critically evaluated to test the validity of the Stokes–Einstein relation.

关键词： sodium chloride solutions supercooled liquids molecular dynamics Stokes–Einstein relation

A new procedure for exploring chaotic attractors in nonlinear dynamical systems under random excitations

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Acta Mechanica Sinica 2011年第4期27卷 593-601页

作者： Chun-Biao gan Hua Lei Department of Mechanical Engineering Zhejiang University310027 Hangzhou China Institute of Applied Mechanics SAAZhejiang University310027 Hangzhou China

Due to uncertain push-pull action across boundaries between different attractive domains by random excitations, attractors of a dynamical system will drift in the phase space, which readily leads to colliding and mixing with each other, so it is very difficult to identify irregular signals evolving from arbitrary initial states. Here, periodic attractors from the simple cell mapping method are further iterated by a specific Poincare map in order to observe more elaborate structures and drifts as well as possible dynamical bifurcations. The panorama of a chaotic attractor can also be displayed to a great extent by this newly developed procedure. From the positions and the variations of attractors in the phase space, the action mechanism of bounded noise excitation is studied in detail. Several numerical examples are employed to illustrate the present procedure. It is seen that the dynamical identification and the bifurcation analysis can be effectively performed by this procedure.

关键词： Dynamical system Bounded noise excitationPoincare map Chaotic attractor. Bifurcation

Fractional Stokes–Einstein relation in TIP5P water at high temperatures

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Chinese Physics B 2018年第6期27卷 307-314页

作者： gan Ren Ge Sang Science and Technology on Surface Physics and Chemistry Laboratory Jiangyou 621908 China

Fractional Stokes–Einstein relation described by D ～（τ/T）~ξ is observed in supercooled water, where D is the diffusion constant, τ the structural relaxation time, T the temperature, and the exponent ξ =τ^（-1）. In this work, the Stokes–Einstein relation in TIP5 P water is examined at high temperatures within 400 K–800 K. Our results indicate that the fractional Stokes–Einstein relation is explicitly existent in TIP5P water at high temperatures, demonstrated by the two usually adopted variants of the Stokes–Einstein relation, D ～τ^（-1）τand D ～ T/τ, as well as by D ～ T/η, where η is the shear viscosity. Both D ～τ^（-1）τand D ～ T/τ are crossed at temperature Tx= 510 K. The D ～τ^（-1）τis in a fractional form as D ～ τ ξwith ξ =-2.09 for T ≤ Txand otherwise ξ =τ^（-1）.25. The D ～ T/τ is valid with ξ =τ^（-1）.01 for T ≤ Txbut in a fractional form for T Tx. The Stokes–Einstein relation D ～ T/η is satisfied below Tx = 620 K but in a fractional form above Tx. We propose that the breakdown of D ～ T/η may result from the system entering into the super critical region, the fractional forms of D ～τ^（-1）τand D ～ T/τ are due to the disruption of the hydration shell and the local tetrahedral structure as well as the increase of the shear viscosity.

关键词： Stokes-Einstein relation TIP5P water molecular dynamics hydration shells

Stability of the distributed Kalman filter using general random coefficients

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Science China(Information Sciences) 2021年第7期64卷 66-79页

作者： Die gan Siyu XIE Zhixin LIU Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of Sciences School of Mathematical Sciences University of Chinese Academy of Sciences The Department of Electrical and Computer Engineering Wayne State University

In this paper, we propose a distributed Kalman filter(DKF) for the dynamical system with general random coefficients. In the proposed method, each estimator shares local innovation pairs with its neighbors to collectively complete the estimation task. Further, we introduce a collective random observability condition by which the Lp-stability of the covariance matrix and the Lp-exponential stability of the homogeneous part of the estimation error equation can be established. In contrast, the stringent conditions on the coefficient matrices, such as independency and stationarity are not required. Besides, the stability of the DKF, i.e., the boundedness of the filtering errors, can be established. Finally, from the simulation result,we demonstrate the cooperative effect of the sensors.

关键词： distributed Kalman filter collective random observability L p-stable L p-exponentially stable state estimation