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Numerical Simulation and Analysis of Electromagnetic Fields Induced by a Moving Ship Based on a Three-Layer Geoelectric Model

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Journal of Ocean University of China 2020年第6期19卷 1299-1306页

作者： shao Guihang LI Yuguo College of Marine Geoscience and Key Laboratory of Submarine Geosciences and Prospecting TechniquesMinistry of EducationOcean University of ChinaQingdao 266100China Evaluation and Detection Technology Laboratory of Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

In this paper,we present a numerical simulation method of electromagnetic(EM)fields induced by a moving ship(EMFMS),which consist of both the shaft-rate EM field and the static EM *** shaft-rate EM fields in the frequency domain are first obtained by solving the partial differential equations together with suitable boundary conditions,and then they are transformed into the time domain by using the inverse Fourier ***,the static fields are added to obtain the EM fields of a moving *** effects of the source current intensity and the source position on the EM fields of a moving ship are discussed in detail.A field example of EM response of a moving ship is presented and its characteristics are analyzed.

关键词： moving ship shaft-rate EM field static EM field numerical simulation

Manifolds with pinched 2-positive curvature operator

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Frontiers of Mathematics in China 2012年第5期7卷 873-882页

作者： Gang PENG Hongliang shao Department of Mathematics Capital Normal UniversityBeijing 100048China

In this paper, we show that any complete Riemannian manifold of dimension great than 2 must be compact if it has positive complex sectional curvature and δ-pinched 2-positive curvature operator, namely, the sum of the two smallest eigenvalues of curvature operator are bounded below by δ.scal 〉 O. If we relax the restriction of positivity of complex sectional curvature to non- negativity, we can also show that the manifold is compact under the additional condition of positive asymptotic volume ratio.

关键词： δ-pinched 2-positive curvature operator complex sectional curvature asymptotic volume ratio

Analysis of spatial distribution characteristics and driving factors of ethnicminority villages in China using geospatial technology and statistical models

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Journal of Mountain Science 2024年第8期21卷 2770-2789页

作者： shao Dandan ZOH Kyungjin Interdisciplinary Program in Landscape Architecture Graduate School of Environmental StudiesSeoul National UniversitySeoul 08826Korea Graduate School of Environmental Studies Seoul National UniversitySeoul 08826Korea

This study aims to reveal the spatial structural characteristics of 1,652 Ethnic-Minority Villages(EMV)in China and to analyze the mechanisms driving their spatial *** are a special type of settlement space that preserve a large number of historical traces of the ethnic culture of ancient *** are important carriers of China’s excellent traditional culture and are key to the implementation of rural revitalization *** this study,1652 EMV in China were selected as the research *** Nearest Neighbor Index,kernel density,and spatial autocorrelation index were employed to reveal the spatial structural characteristics of minority *** network models,spatial lag models,and geographical detectors were used to analyze the formation mechanism of spatial heterogeneity in *** results indicate that:(1)EMV exhibit significant spatial differentiation characterized by“single-core with multiple surrounding sub-centers,”“polarization between east and west,”“decreasing quantity from southwest to east coast to northeast to northwest,”and“large dispersion with small agglomeration.”(2)EMV are mainly distributed in areas rich in intangible cultural heritage,with high vegetation coverage and low altitude,far from central cities,and having limited arable land and an underdeveloped economy and transportation,particularly in shaded or riverbank areas.(3)Distance from the nearest river(X3),distance from central cities(X8),national intangible cultural heritage(X9),and NDVI(X10)were the main driving factors affecting the spatial distribution of EMV,whereas elevation(X1)and GDP(X5)had the weakest *** EMV are a relatively unique territorial spatial unit,the identification of their spatial heterogeneity characteristics not only deepens the research content of settlement geography,but also involves the assessment,protection,and development of Minority Villages,which is of great significance for the inheritance and utilization of excellent

关键词： Ethnic-Minority Villages Spatial structure Settlement geography Neural network model Spatial econometric model GeoDetector

Heavy tail and light tail of Cox-Ingersoll-Ross processes with regime-switching

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Science China Mathematics 2020年第6期63卷 1169-1180页

作者： Tongtong Hou Jinghai shao School of Mathematical Sciences Beijing Normal UniversityBeijing 100875China Center for Applied Mathematics Tianjin UniversityTianjin 300072Chind

This study aims to investigate the tail behavior of Cox-Ingersoll-Ross(CIR) processes with regime switching. An essential difference shown in this study between CIR processes with and without regime switching is that the stationary distribution of those with regime switching may be heavy-tailed. We first provide sharp criteria to justify the existence of a stationary distribution for the CIR process with regime switching, which is applied to study the long-term returns of interest rates. Then, we provide a criterion to identify whether this distribution is heavy-tailed. Our results provide theoretical evidence of the existence of regime switching for interest-rate models based on empirical evidence of a heavy-tailed distribution.

关键词： regime switching heavy tail light tail ergodicity

Propagation of chaos and conditional McKean-Vlasov SDEs with regime-switching

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Frontiers of Mathematics in China 2022年第4期17卷 731-746页

作者： Jinghai shao Dong WEI Center for Applied Mathematics Tianjin UniversityTianjin300072China

We investigate a particle system with mean field interaction living in a random environment characterized by a regime-switching *** switching process is allowed to be dependent on the particle *** well-posedness and various properties of the limit conditional McKean-Vlasov SDEs are studied,and the conditional propagation of chaos is established with explicit estimate of the convergence rate.

关键词： Regime-switching propagation of chaos Wasserstein distance conditional McKean-Vlasov SDEs rate of convergence

Orange-emitting bimetallic nanoclusters combined with cyan-emitting Fe@TAOH as white light-emitting materials

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Chinese Chemical Letters 2022年第1期33卷 298-303页

作者： Wenying Mi Na shao College of Chemistry Beijing Normal UniversityBeijing 100875China

White-light-emitting diodes(WLEDs)possess many merits,such as high efficiency and *** cost-effective,environmentally friendly,high-performance luminophores to achieve high-quality,full-spectrum,white lighting is of great importance to the construction and progress of *** this work,solid-state,highly luminescent orange-emitting nanoclusters(MgCl_(2)-Lys-Ag/Au NCs)were prepared via the salt-induced precipitation of Lys-Ag/Au NCs from solution,which showed a high absolute quantum yield of 44.5%.A cyan-emitting metal-organic framework(MOF)-like nanomaterial(named Fe@TAOH)was also prepared by the self-assembly of the coordination compound of Fe^(3+)and TAOH acted upon by H_(3)PO_(4) via H-bonding andπ-πstacking interactions,which showed an emission peak at 485 nm and an absolute quantum yield of 21.7%.The potential application of the two facile-synthesis,low toxicity,and highly luminescent materials in WLEDs was *** WLEDs was constructed by coating powdered Fe@TAOH and MgCl_(2)-Lys-Ag/Au NCs samples on commercial GaN LED chip with 365 nm emissions,and it exhibited acceptable white light characteristics with a CIE color coordinates and a color rendering index(CRI)of(0.28,0.34)and 79.6,respectively,implying good prospects in the field of WLEDs.

关键词： Metal nanoclusters Salt-mediated precipitation Fe@TAOH MOFs Self-assembly White light-emitting materials

Weighted Estimates of Variable Kernel Fractional Integral and Its Commutators on Vanishing Generalized Morrey Spaces with Variable Exponent

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Chinese Annals of Mathematics,Series B 2021年第3期42卷 451-470页

作者： Xukui shao Shuangping TAO School of Mathematics and Statistics LongDong UniversityQingyang 745000GansuChina School of Mathematics and statistics Northwest Normal UniversityLanzhou 730070China Corresponding author.School of Mathematics and Statistics Northwest Normal UniversityLanzhou 730070China

In this paper,the authors obtain the boundedness of the fractional integral operators with variable kernels on the variable exponent generalized weighted Morrey spaces and the variable exponent vanishing generalized w... 详细信息

关键词： Fractional integral Commutator Variable kernel Vanishing generalized weighted Morrey space with variable exponent BMO space

Corrections to Solar Thermal Structure when a Turbulent Magnetic Field is Included

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Chinese Journal of Astronomy and Astrophysics 2004年第5期4卷 490-498页

作者： YiLiao shao-LanBi NationalAstronomicalObservatories YunnanObservatoryKunming650011

Correction of non-ideal effect due to a magnetic fluctuating tensor is derived from the ideal MHD equations. The inclusion of a magnetic turbulent field leads to modifications of the hydrostatic equilibrium equation and thermodynamical variables such as the temperature T, the adiabatic exponent γ, the adiabatic temperature gradient ?ad and the temperature gradient ?. In particular, the modifications in the adiabatic and radiative temperature gradients will result in a change in the Schwarzchild criterion, hence in the location of the base of the convective zone. Incorporating the modifications, we construct a modified thermodynamical equilibrium structure of the Sun.

关键词： solar convection MHD: thermodynamics variables sun: hydrostatic equilibriumequation

Dynamic structure factor of a Bose-Hubbard gas

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Chinese Science Bulletin 2008年第16期53卷 2432-2437页

作者： shao TingLi Department of Mathematics and Physics Shenyang Institute of Chemical Technology Shenyang 110142 China

The dynamic structure factor of a Bose-Einstein condensate in an optical lattice, momentum and en- ergy rates imparted to the condensate are analyzed in detail as the function of both the lattice depth and the strength of the two-body interaction. Our investigation shows that the lattice depth strongly affects the dynamic structure factor. An oscillating behavior of both the static structure factor and ex- citation strength as a function of the momentum transfer has been developed. We also show how in- teratomic interaction affects these processes and discuss the conditions for possible experimental realization.

关键词： Bose-Einstein冷凝物动态结构气体光学晶格