Search results for: Fangqi Chen

Items from 1 to 20 out of 68 results

article

The emergence of delta shock in the limit process for two‐dimensional steady nonisentropic relativistic Euler flow onto a straight wedge

Jie Cheng, Fangqi Chen, Zejun Wang

ZAMM ‐ Journal of Applied Mathematics and Mechanics / Zeitschrift für... > 103 > 10 > n/a - n/a

In this paper, we mainly study the limit of solutions to the two‐dimensional steady nonisentropic relativistic Euler flow onto a straight wedge. It turns out that the sequence of shock solutions tends to a delta wave adhering to the wedge surface when the velocity of the incident flow goes to the speed of light and the adiabatic index tends to 1 in turn. Meanwhile, it also verifies that the pressure...

article

Biomass‐Based Materials for Sustainably Sourced Solar‐Driven Interfacial Steam Generation

Xiaojie Liu, Yanpei Tian, Andrew Caratenuto, Fangqi Chen, more

Advanced Engineering Materials > 25 > 19 > n/a - n/a

Solar‐driven interfacial water evaporation powered by solar energy has gained significant interest as a sustainable and cost‐efficient desalination technology, owing to its zero reliance on fossil fuels. It aligns the relationship between freshwater demand and environmental‐friendly water yields and provides us with a feasible and effective way to mitigate the global water crisis. Biomass‐derived...

article

Real‐data on the use of baricitinib in adolescents with severe alopecia areata

Jinshan Zhan, Juanmei Cao, Fangqi Chen, Yifan Jin, more

Journal of the European Academy of Dermatology and Venereology > 37 > 8 > e1085 - e1086

article

Blaschko linear lupus erythematosus treated with baricitinib: A case report

Jinshan Zhan, Fangqi Chen, Yifan Jin, Liang Yan, more

The Journal of Dermatology > 50 > 7 > e213 - e215

article

Surface Photon‐Engineered Infrared‐Black Metametal Enabled Enhancement of Heat Dissipation

Yanpei Tian, Xiaojie Liu, Lijia Xie, Shilin Xu, more

Advanced Functional Materials > 32 > 46 > n/a - n/a

Heat dissipation is a severe barrier for ever‐smaller and more functionalized electronics, necessitating the continuous development of accessible, cost‐effective, and highly efficient cooling solutions. Metals, such as silver and copper, with high thermal conductivity, can efficiently remove heat. However, ultralow infrared thermal emittance (<0.03) severely restricts their radiative heat dissipation...

article

Chaotic dynamics and subharmonic bifurcations of current‐carrying conductors subjected to harmonic excitation

Liangqiang Zhou, Sengen Hu, Fangqi Chen

ZAMM ‐ Journal of Applied Mathematics and Mechanics / Zeitschrift für... > 102 > 9 > n/a - n/a

With both analytical and numerical methods, global dynamics including chaotic motions and subharmonic bifurcations of current‐carrying conductors subjected to harmonic excitation are investigated in this paper. The system parameter conditions for chaos are obtained with the Melnikov method. The monotonicity of the critical value for chaos on the damping, alternating current, and excitation amplitude...

article

Global structure of two dimensional Riemann solutions to the Euler system for isentropic Chaplygin gas

Jie Cheng, Fangqi Chen, Zejun Wang

ZAMM ‐ Journal of Applied Mathematics and Mechanics / Zeitschrift für... > 102 > 7 > n/a - n/a

In this paper, we study the two dimensional Riemann problem of the Euler system for isentropic Chaplygin gas, and the initial data consist of three pieces constant states divided by an inverted Y‐type curve. The results extended the results in Chen and Qu where the solution of every one dimensional Riemann problem contains no slip plane. We divide the discussion into several cases and for each case,...

article

Ground state solutions of a fractional advection–dispersion equation

Yan Qiao, Fangqi Chen, Yukun An

Mathematical Methods in the Applied Sciences > 45 > 9 > 5267 - 5282

In this paper, a class of fractional Sturm–Liouville advection–dispersion equations with instantaneous and noninstantaneous impulsive boundary conditions is considered. At the beginning, the existence of at least one nontrivial ground state solution is proved by the method of Nehari manifold without the Ambrosetti–Rabinowitz condition. Then, the existence of infinitely many nontrivial weak solutions...

article

Cockade nevus: A case report

Yan Liang, Juanmei Cao, Xiuyun Xuan, Xiaoying Qu, more

JDDG: Journal der Deutschen Dermatologischen Gesellschaft > 20 > 3 > 350 - 352

article

Kokarden‐Nävus: Ein Fallbericht

Yan Liang, Juanmei Cao, Xiuyun Xuan, Xiaoying Qu, more

JDDG: Journal der Deutschen Dermatologischen Gesellschaft > 20 > 3 > 351 - 354

article

Variational formulation for nonlinear impulsive fractional differential equations with (p, q)‐Laplacian operator

Dongping Li, Fangqi Chen, Yonghong Wu, Yukun An

Mathematical Methods in the Applied Sciences > 45 > 1 > 515 - 531

In this paper, we focus on a class of generalized (p, q)‐Laplacian‐type impulsive fractional differential equation for 1 < p≤q < ∞, with a nonlinearity f containing fractional derivatives

_{0} D_{t}^{α} u

and

_{0} D_{t}^{β} u

simultaneously and being imposed on mild assumptions contrasting with previous works. The underlying idea is based on the Mountain pass theorem and the iterative technique to obtain the existence...

article

An Easy‐to‐Fabricate 2.5D Evaporator for Efficient Solar Desalination

Xiaojie Liu, Yanpei Tian, Fangqi Chen, Andrew Caratenuto, more

Advanced Functional Materials > 31 > 27 > n/a - n/a

Solar‐driven steam generation, whereby solar energy is harvested to purify water directly, is emerging as a promising approach to mitigate the worldwide water crisis. The scalable application of conventional 3D evaporators is hindered by their complex spatial geometries. A 2.5D structure is a spatial extension of a 2D structure with an addition of a third vertical dimension, achieving both the feasibility...

article

Variational method for p‐Laplacian fractional differential equations with instantaneous and non‐instantaneous impulses

Yan Qiao, Fangqi Chen, Yukun An

Mathematical Methods in the Applied Sciences > 44 > 11 > 8543 - 8553

We discuss a class of p‐Laplacian fractional differential equations with instantaneous and non‐instantaneous impulsive boundary conditions. The existence of an unbounded sequence of weak solutions is given by a recent critical point theory proposed by Bonanno and Bisci. At the end, an example is presented to illustrate our main results.

article

Dynamics of a rectangular thin plate with lumped mass under harmonic foundation and in‐plane excitations

Liangqiang Zhou, Peng Ji, Fangqi Chen

ZAMM ‐ Journal of Applied Mathematics and Mechanics / Zeitschrift für... > 101 > 3 > n/a - n/a

Nonlinear dynamic behaviors including global bifurcations and multi‐pulse chaotic dynamics of a rectangular thin plate with lumped mass subjected to a harmonic foundation excitation and in‐plane excitation are investigated in this paper. With the von K

\overset{́}{a}

\overset{́}{a}

n equation and Galerkin method, the dynamic equation of the first two modes for this model is obtained. Utilized the method of multiple scales,...

article

Dynamic Tuning of Near‐Field Radiative Thermal Rectification

Fangqi Chen, Xiaojie Liu, Yanpei Tian, Yi Zheng

Advanced Engineering Materials > 23 > 2 > n/a - n/a

Taking advantage of phase‐transition and reconfigurable metamaterials, dynamic control of nanoscale thermal modulation can be achieved through the near‐field radiative thermal rectification devices. Herein, an active‐tuning near‐field thermal rectifier using reconfigurable phase‐transition metamaterials is explored. The rectifier has two terminals separated by vacuum, working under a controllable...

article

Three solutions for a class of fractional impulsive advection‐dispersion equations with Sturm‐Liouville boundary conditions via variational approach

Dandan Min, Fangqi Chen

Mathematical Methods in the Applied Sciences > 43 > 15 > 9151 - 9168

In this paper, the Sturm‐Liouville problem is studied for fractional advection‐dispersion equations with impulsive effects. The existence of multiple solutions is obtained by making use of three critical points theorem. An example is given as an application of our main results.

article

Multi-pulse jumping orbits and chaotic dynamics of cantilevered pipes conveying time-varying fluid

Li Zhang, Fangqi Chen

Nonlinear Dynamics > 2019 > 97 > 2 > 991-1009

Global bifurcations and multi-pulse chaotic motions of cantilevered pipes conveying time-varying fluid under external excitation are investigated. The method of multiple scales and Galerkin’s approach are utilized on the partial differential governing equation to yield the four-dimensional averaged equation with 1:2 internal resonance and primary parameter resonance. Based on the averaged equations,...

article

The existence of solutions for an impulsive fractional coupled system of (p, q)‐Laplacian type without the Ambrosetti‐Rabinowitz condition

Dongping Li, Fangqi Chen, Yukun An

Mathematical Methods in the Applied Sciences > 42 > 5 > 1449 - 1464

In this article, based on the variational approach, the existence of at least one nontrivial solution is studied for (p, q)‐Laplacian type impulsive fractional differential equations involving Riemann‐Liouville derivatives. Without the usual Ambrosetti‐Rabinowitz condition, the nonlinearity f in the paper is considered under some suitable assumptions.

article

Global bifurcations and chaos of a composite laminated cylindrical shell in supersonic air flow

Xiaoxia Bian, Fangqi Chen, Fengxian An

Nonlinear Dynamics > 2019 > 96 > 2 > 1095-1114

The global bifurcations and chaotic motions in mode interaction of a composite laminated cylindrical shell subjected to complex loads are investigated in the case of 1 / 2 sub-harmonic resonance for the first-order mode, primary resonance for the second-order mode and 1:2 internal resonance. The energy-phase method is implemented to analyze the global dynamics of the shell. The analytical results...

article

Fractional matrix and inverse matrix projective synchronization methods for synchronizing the disturbed fractional‐order hyperchaotic system

Jinman He, Fangqi Chen, Tengfei Lei

Mathematical Methods in the Applied Sciences > 41 > 16 > 6907 - 6920

In this paper, for synchronizing two actual nonidentical fractional‐order hyperchaotic systems disturbed by model uncertainty and external disturbance, the fractional matrix and inverse matrix projective synchronization methods are presented and the methods' correctness and effectiveness are proved. Especially, under certain degenerative conditions, the methods are reduced to study the complete synchronization,...

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INFONA - science communication portal

Search results for: Fangqi Chen

The emergence of delta shock in the limit process for two‐dimensional steady nonisentropic relativistic Euler flow onto a straight wedge

Biomass‐Based Materials for Sustainably Sourced Solar‐Driven Interfacial Steam Generation

Real‐data on the use of baricitinib in adolescents with severe alopecia areata

Blaschko linear lupus erythematosus treated with baricitinib: A case report

Surface Photon‐Engineered Infrared‐Black Metametal Enabled Enhancement of Heat Dissipation

Chaotic dynamics and subharmonic bifurcations of current‐carrying conductors subjected to harmonic excitation

Global structure of two dimensional Riemann solutions to the Euler system for isentropic Chaplygin gas

Ground state solutions of a fractional advection–dispersion equation

Cockade nevus: A case report

Kokarden‐Nävus: Ein Fallbericht

Variational formulation for nonlinear impulsive fractional differential equations with (p, q)‐Laplacian operator

An Easy‐to‐Fabricate 2.5D Evaporator for Efficient Solar Desalination

Variational method for p‐Laplacian fractional differential equations with instantaneous and non‐instantaneous impulses

Dynamics of a rectangular thin plate with lumped mass under harmonic foundation and in‐plane excitations

Dynamic Tuning of Near‐Field Radiative Thermal Rectification

Three solutions for a class of fractional impulsive advection‐dispersion equations with Sturm‐Liouville boundary conditions via variational approach

Multi-pulse jumping orbits and chaotic dynamics of cantilevered pipes conveying time-varying fluid

The existence of solutions for an impulsive fractional coupled system of (p, q)‐Laplacian type without the Ambrosetti‐Rabinowitz condition

Global bifurcations and chaos of a composite laminated cylindrical shell in supersonic air flow

Fractional matrix and inverse matrix projective synchronization methods for synchronizing the disturbed fractional‐order hyperchaotic system

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