Results 41 to 50 of about 1,029,298 (227)

Uniform Ultimate Boundedness of Solutions of Third-Order Nonlinear Delay Differential Equations

Annals of the Alexandru Ioan Cuza University - Mathematics, 2010
Summary: We study the uniform boundedness and uniform ultimate boundedness of solutions of the third order delay differential equation \[ \dddot x+\varphi(x,\dot x)\ddot x+g(\dot x(t-r(t)))+f(x(t-r(t)))=p(t,x,\dot x, \ddot x),\tag{*} \] where \(0\leq r(t)\leq\gamma\), \(\gamma\) is a positive constant, \(\varphi\), \(g\), \(f\) and \(p\) are continuous
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Gallium Microalloying in Bi–Sn Solders: Interfacial Phase Formation, Wettability, and Long‐Term Shear Reliability Under Isothermal Aging

Advanced Engineering Materials, EarlyView.
Gallium microalloying redirects interfacial reactions in low‐temperature Bi–Sn solders from Cu–Sn toward Cu–Ga intermetallic formation. The resulting Cu–Ga layer suppresses intermetallic growth during thermal aging, alters fracture pathways, and improves interfacial stability.
Iva Králová, Markéta Klimtová, Mohd Faizul Mohd Sabri, Yew Hoong Wong, Petr Veselý, Martin Plaček, Karel Dušek   +6 more
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Adaptive Robust Constraint-Following Control of Vector–Rotor UAVs Subject to High-Intensity Time-Varying Water-Jet Disturbances

Dynamics
In high-rise firefighting scenarios, unmanned aerial vehicles (UAVs) equipped with water-spraying systems are subjected to high-intensity and rapidly time-varying reaction forces induced by high-speed water jets.
Zhao Ni, Xinfeng Zhang, Jie Bai, Bing Rao, Jiawen Dai, Bangji Zhang, Zheshuo Zhang   +6 more
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Global Behavior of a Multi–Group Seir Epidemic Model with Spatial Diffusion in a Heterogeneous Environment

International Journal of Applied Mathematics and Computer Science, 2022
In this paper, we propose a multi-group SEIR epidemic model with spatial diffusion, where the model parameters are spatially heterogeneous. The positivity and ultimate boundedness of the solution, as well as the existence of a global attractor of the ...
Liu Pengyan, Li Hong-Xu
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Uniform ultimate boundedness of solutions of predator-prey system with Michaelis-Menten functional response on time scales [PDF]

Advances in Difference Equations, 2016
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Yu, Yang-Yang, Wang, Lin-Lin, Fan, Yong-Hong   +2 more
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High‐Entropy Alloy Interlayers Toward Advanced Joining for High‐Performance Structural Applications: Current Progress and Emerging Challenges

Advanced Engineering Materials, EarlyView.
HEA interlayers offer a versatile route for joining high‐performance structural materials. Their compositional and structural design regulates interfacial reactions, suppresses brittle IMCs, and improves metallurgical bonding. Sandwich interlayers further integrate defect healing with precipitation strengthening, enabling improved strength–ductility ...
Lin Yuan, Jiafen Song, Jinglong Li, Jiangtao Xiong, Tao Yang   +4 more
wiley   +1 more source

Stability and boundedness of nonautonomous neutral differential equation with delay [PDF]

Mathematica Moravica, 2020
We consider the nonautonomous neutral differential equation with delay h p(t) q(t) x(t) + b1x(t - r1) 0 0i0 + a(t) x 00(t) + b2x 00(t - r2) +b(t) x 0 (t) + b3x 0 (t - r3) + c(t)f(x(t - s)) = e(t, x, x0 , x 00).
Remili Moussadek, Oudjedi Linda D.
doaj  

Electrode and Microstructure Dependence of Oxygen Diffusion in Ferroelectric Hafnium Zirconium Oxide Thin Films

Advanced Functional Materials, EarlyView.
Significant nanoscale oxygen diffusion coefficient variations are measured in ferroelectric hafnium zirconium oxide films with grain boundaries and electrode interfaces exhibiting values 104 times larger than the grain cores. Overall coefficients are 10X larger for films prepared with metal nitride electrodes compared to refractory metals. New insights
Liron Shvilberg, Thomas W. Pfeifer, Chuanzhen Zhou, Yong Kyu Choi, Duk‐Hyun Choe, Patrick E. Hopkins, Jon F. Ihlefeld   +6 more
wiley   +1 more source

Fixed-Time Disturbance Observer-Based Connectivity-Preserving Formation Control for High-Order Multi-Agent Systems with Actuator Faults

Actuators
This paper investigates connectivity-preserving formation control for high-order multi-agent systems under switching distance-dependent topologies, actuator faults and external disturbances.
Wenjing Yang, Chen Zhang, Yajun Xu, Chao Lu, Pingyuan Yan, Zhihan Shi   +5 more
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Advances in Sustainable and Wearable Textile Based Soft Robotics

Advanced Functional Materials, EarlyView.
This Review examines advances in wearable textile‐based soft robotics, focusing on sustainable materials, integrated sensing, and scalable actuation. It discusses manufacturing and system integration across healthcare, assistive robotics, prosthetics, and human–machine interfaces, and highlights key challenges in circular design, including life‐cycle ...
Zahir Abbas, Marzia Dulal, Sophia K. Novoselov, Victoria K. Novoselov, Kostya S. Novoselov, Shaila Afroj, Nazmul Karim   +6 more
wiley   +1 more source