Results 71 to 80 of about 404,835 (279)
Open Mathematics, 2022 In this article, by using critical point theory, we prove the existence of multiple TT-periodic solutions for difference equations with the mean curvature operator: −Δ(ϕc(Δu(t−1)))+q(t)u(t)=λf(t,u(t)),t∈Z,-\Delta ({\phi }_{c}\left(\Delta u\left(t-1)))+q ...
Wang Zhenguo, Li Qiuying
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Advanced Engineering Materials, EarlyView.This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal +2 more
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Removing Oxide Layers and Retaining Oxide‐Free Steel Surfaces by Polishing in Oxygen‐Free Atmosphere
Advanced Engineering Materials, EarlyView.In this study, the efficacy of wet mechanical polishing under an oxygen‐free atmosphere for deoxidation and the retention of an oxide‐free steel surface are elucidated using X‐ray photoelectron spectroscopy. The methodology proved successful; however, the results were highly dependent on the preparation of the solvents used to clean the samples after ...
Friedrich Bürger +2 more
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On The Existence Of Periodic Solutions Of Certain Fourth Order Differential Equations with Dealy [PDF]
, 2013 We derive existence results for the periodic boundary value problem .r'" ' + uf.· + f (.); ).\: + ex + g (f. r(..r - r) = p ( l ) \ ( OJ = x(2rrl .. ~ (0) = .\· (2 17' ) . . \' Ol = x! '21r ).
Iyase, S.A .
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Evaluating Energy Absorption Performance of Filled Lattice Structures
Advanced Engineering Materials, EarlyView.Maximum stress must be considered to robustly evaluate energy absorber designs. This approach was applied to compare all types of absorbers in a single Ashby diagram and determine the utility of filling lattice voids with a second material. High‐performance fillers can improve the performance of lattices that are limited by buckling or catastrophic ...
Christian Bonney +2 more
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About Two Finite-Dimensional Approximations of the Periodic Boundary Value Problem
Моделирование и анализ информационных систем, 2011 Two numerical methods for solving the periodic boundary value problem are considered: Galerkin's method and the method of polygonal lines. The original problem is mapped to the sequence of its discretization - systems of equations in finite spaces ...
N. A. Demyankov
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Solutions to a moving boundary problem on the Boltzmann equation
, 2018 Let the motion of a rarefied gas between two parallel infinite plates of the same temperature be governed by the Boltzmann equation with diffuse reflection boundaries, where the left plate is at rest and the right one oscillates in its normal direction ...
Duan, Renjun, Zhang, Zhu
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Nonlinear second-order periodic boundary value problems
Journal of Mathematical Analysis and Applications, 1988 For the nonlinear boundary value problem (BVP) with periodic boundary conditions \(u''+f(t,u)=0\), \(u(0)=u(2\pi)\), \(u'(0)=u'(2\pi)\), the existence of lower and upper solutions \(\alpha\) and \(\beta\) with \(\alpha\leq \beta\) on [0,2\(\pi\) ] guarantees the existence of a solution u(t) of the BVP with \(\alpha\leq u\leq \beta\). In this paper, the
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Surface Tension Measurement of Ti‐6Al‐4V by Falling Droplet Method in Oxygen‐Free Atmosphere
Advanced Engineering Materials, EarlyView.In this article, the temperature‐dependent surface tension of free falling, oscillating Ti‐6Al‐4V droplets is investigated in both argon and monosilane doped, oxygen‐free atmosphere. Droplet temperature and oscillation are captured with one single high‐speed camera, and the surface tension is calculated with Rayleigh's formula.
Johannes May +9 more
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The Existence of Positive Solutions for Singular Impulse Periodic Boundary Value Problem
International Journal of Differential Equations, 2011 We obtain new result of the existence of positive solutions of a class of singular impulse periodic boundary value problem via a nonlinear alternative principle of Leray-Schauder.
Zhaocai Hao, Tanggui Chen
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