Yangjun Ma

ORCID: 0000-0003-0086-547X
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Research Areas
  • Navier-Stokes equation solutions
  • Advanced Differential Equations and Dynamical Systems
  • Nonlinear Waves and Solitons
  • COVID-19 epidemiological studies
  • Electrochemical Analysis and Applications
  • Mathematical and Theoretical Epidemiology and Ecology Models
  • Advanced Photocatalysis Techniques
  • Black Holes and Theoretical Physics
  • Viral Infections and Outbreaks Research
  • SARS-CoV-2 and COVID-19 Research
  • Nonlinear Dynamics and Pattern Formation
  • Cosmology and Gravitation Theories
  • Conducting polymers and applications
  • Stochastic processes and statistical mechanics
  • CO2 Reduction Techniques and Catalysts
  • Electrocatalysts for Energy Conversion
  • Advanced Thermoelectric Materials and Devices
  • Fluid Dynamics and Turbulent Flows
  • Viral Infections and Immunology Research
  • Liquid Crystal Research Advancements
  • Advanced Mathematical Physics Problems
  • T-cell and Retrovirus Studies
  • Fuel Cells and Related Materials
  • Animal Disease Management and Epidemiology
  • Ocean Waves and Remote Sensing

Beijing University of Chemical Technology
2023-2024

Chongqing Jiaotong University
2021-2024

Beijing University of Civil Engineering and Architecture
2024

Guangdong Medical College
2024

North University of China
2013

Abstract Carbon materials are of great significance in state‐of‐the‐art electrochemical CO 2 reduction (ECR) as key components such electrocatalysts, gas diffusion electrodes, and current collectors. Notably, dimensionalities carbons related manipulations play vital roles boosting ECR performance, e.g., mass/charge transfer dynamics, exposure active sites, reaction space, product's Faradaic efficiency/selectivity, durability. Here, recent endeavors dimensionality engineering toward advanced...

10.1002/adfm.202408013 article EN Advanced Functional Materials 2024-08-09

Hand, foot and mouth disease (HFMD) is one of the majorpublic-health problems in China. Based on HFMD data Department Health Shandong Province, we propose a dynamic model with periodic transmission rates to investigate seasonal HFMD. After evaluating basic reproduction number, analyze dynamical behaviors simulate Province. By carrying out sensitivity analysis some key parameters, conclude that recessive subpopulation plays an important role spread HFMD, only quarantining infected not...

10.3934/mbe.2013.10.1159 article EN cc-by Mathematical Biosciences & Engineering 2013-01-01

<abstract> In this paper, we present an SEII$ { _\rm a} $HR epidemic model to study the influence of recessive infection and isolation in spread COVID-19. We first prove that infection-free equilibrium is globally asymptotically stable with condition $ R_0 &lt; 1 positive uniformly persistent when &gt; $. By using COVID-19 data India, then give numerical simulations illustrate our results carry out some sensitivity analysis. know asymptomatic infections will affect disease quarantine rate...

10.3934/mbe.2021095 article EN cc-by Mathematical Biosciences & Engineering 2021-01-01

In this paper we study the incompressible non-inertial Qian-Sheng model, which describes hydrodynamics of nematic liquid crystals without inertial effect in $ Q $-tensor framework. Under some proper assumptions on viscous coefficients, prove local well-posedness with large initial data and global existence small size classical solutions regime.

10.3934/dcds.2020187 article EN Discrete and Continuous Dynamical Systems 2020-01-01

For the inertial Qian–Sheng model of nematic liquid crystals in [Formula: see text]-tensor framework, we illustrate roles played by entropy inequality and energy dissipation well-posedness smooth solutions when employ method. We first derive coefficients requirements from inequality, point out is insufficient to guarantee dissipation. then introduce a novel Condition (H) which ensures prove that both are obeyed, local time exist for large initial data. Otherwise, can only obtain small data...

10.1142/s0219891621500065 article EN Journal of Hyperbolic Differential Equations 2021-03-01

<p style='text-indent:20px;'>In this paper we study the incompressible limit of compressible inertial Qian-Sheng model for liquid crystal flow. We first derive uniform energy estimates on Mach number <inline-formula><tex-math id="M1">\begin{document}$ \epsilon $\end{document}</tex-math></inline-formula> both system and its differential with respect to time under uniformly in id="M2">\begin{document}$ small initial data. Then, based these estimates, pass as id="M3">\begin{document}$...

10.3934/dcds.2020304 article EN Discrete and Continuous Dynamical Systems 2020-08-18

ABSTRACTWe study the Cauchy problem of new model three dimensional inertial nematic electrolyte, which models N-species charged particles diffuse and advect in liquid crystalline matrix. This was proposed by [Calderer MC, Golovaty D, Lavrentovich O, et al. Modeling electrolytes nonlinear electroosmosis. SIAM J Appl Math. 2016;76:2260–2285. doi: 10.1137/16M1056225]. The effect is such that system involves a hyperbolic feature. We first derive local existence large initial data when flow...

10.1080/00036811.2023.2256351 article EN Applicable Analysis 2023-09-14

In this paper, we study the well‐posedness of Cauchy problem to compressible inertial Qian–Sheng model. Inspired by Jiang–Luo–Ma–Tang's work in [J. Hyperbolic. Differ. Equ 18:221‐256, 2021], introduce a novel Condition (H) which ensures energy dissipation, and then, prove that when both viscosity coefficients are satisfied, local‐in‐time solutions exist for large initial data. Otherwise, can only obtain small data local solutions. Finally, solution be extended globally under at least one two...

10.1002/mma.9839 article EN Mathematical Methods in the Applied Sciences 2024-01-14

&lt;abstract&gt;&lt;p&gt;Since the global outbreak of COVID-19, virus has continuously mutated and can survive in air for long periods time. This paper establishes analyzes a model COVID-19 with self-protection quarantine measures affected by viruses environment to investigate influence on spread outbreak, as well develop rational prevention control measure outbreak. The basic reproduction number was calculated Lyapunov functions were constructed discuss stability equilibrium points....

10.3934/mbe.2024213 article EN cc-by Mathematical Biosciences & Engineering 2024-01-01

The Qian–Sheng model is a system describing the hydrodynamics of nematic liquid crystals in Q-tensor framework. When inertial effect included, it hyperbolic-type involving second-order material derivative coupling with forced incompressible Navier–Stokes equations. If formally letting constant [Formula: see text] go to zero, resulting corresponding parabolic model. We provide result on rigorous justification this limit small initial data, which validates mathematically To achieve this, an...

10.1142/s0219530521500184 article EN Analysis and Applications 2021-11-09
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