Results 41 to 50 of about 1,955 (219)

The stability number of the Timoshenko system with second sound

Journal of Differential Equations, 2012
AbstractIn this work, we consider the Timoshenko beam model with second sound. We introduce a new number χ0 that characterizes the exponential decay. We prove that the corresponding semigroup associated to the system is exponentially stable if and only if χ0=0. Otherwise there is a lack of exponential stability. In this case we prove that the semigroup
Mauro Santos, D. S. Almeida Júnior, J.E. Muñoz Rivera   +2 more
openaire   +2 more sources

The Haber Bosch Catalyst from Solid state Chemistry to Mesotechnology

Advanced Energy Materials, EarlyView.
A comprehensive, multi‐scale, multi‐modal study of the structural diversity of a technical multi‐promoted Haber Bosch catalyst for ammonia synthesis is provided. The different contributions of ammonia Fe are revealed and the presence of cement phases that have yet not been incorporated into discussions on the function of this catalyst system is shown ...
Kassiogé Dembélé, Jihao Wang, Maxime Boniface, Jan Folke, Luis Sandoval Diaz, Frank Girgsdies, Adnan Hammud, David Kordus, Gregor Koch, Zahra Gheisari, Raoul Blume, Wulyu Jiang, Axel Knop‐Gericke, Rene Eckert, Stephan Reitmeier, Andreas Reitzmann, Robert Schlögl, Beatriz Roldan Cuenya, Janis Timoshenko, Holger Ruland, Thomas Lunkenbein   +20 more
wiley   +1 more source

Vibration of a Reissner–Mindlin–Timoshenko plate–beam system [PDF]

Mathematical and Computer Modelling, 2009
In this paper, we consider a plate-beam system in which the Reissner-Mindlin plate model is combined with the Timoshenko beam model. Natural frequencies and vibration modes for the system are calculated using the finite element method. The interface conditions at the contact between the plate and beams are discussed in some detail.
Labuschagne, A, Van Rensburg, N.J, Van der Merwe, Alna   +2 more
openaire   +2 more sources

Stability of thermoelastic Timoshenko system with variable delay in the internal feedback

Electronic Research Archive
Based on the Fourier law of heat conduction, this paper was concerned with the thermoelastic Timoshenko system with memory and variable delay in the internal feedback, which describes the transverse vibration of a beam. By the Lummer-Phillips theorem and
Xinfeng Ge, Keqin Su
doaj   +1 more source

Smart Bioinspired Material‐Based Actuators: Current Challenges and Prospects

Advanced Intelligent Systems, Volume 7, Issue 3, March 2025.
This work gathers, in a review style, an extensive and comprehensive literature overview on the development of autonomous actuators based on synthetic materials, bringing together valuable knowledge from several studies. Furthermore, the article identifies the fundamental principles of actuation mechanisms and defines key parameters to address the size
Alejandro Palacios, Léon Chiriatti, Simon Poppinga, Thomas Speck, Vincent Le Houérou   +4 more
wiley   +1 more source

Asymptotic behavior of solutions of a viscoelastic Shear beam model with no rotary inertia: General and optimal decay results

Open Mathematics
In this study, we consider a viscoelastic Shear beam model with no rotary inertia. Specifically, we study ρ1φtt−κ(φx+ψ)x+(g∗φxx)(t)=0,−bψxx+κ(φx+ψ)=0,\begin{array}{rcl}{\rho }_{1}{\varphi }_{tt}-\kappa {\left({\varphi }_{x}+\psi )}_{x}+\left(g\ast ...
Al-Mahdi Adel M.
doaj   +1 more source

Harnessing Discrete Differential Geometry: A Virtual Playground for the Bilayer Soft Robots

Advanced Intelligent Systems, EarlyView.
A discrete differential geometry‐based framework is developed to model the mechanics of bilayer structures with asymmetric geometry and material properties. The simulations capture dynamic bending and contact interactions in soft robotic grasping, crawling, jumping, and swimming, demonstrating the framework's versatility for programmable shape morphing
Jiahao Li, Dezhong Tong, Zhuonan Hao, Yinbo Zhu, Hengan Wu, Mingchao Liu, Weicheng Huang   +6 more
wiley   +1 more source

Dynamic Stiffness Matrix for a Beam Element with Shear Deformation

Shock and Vibration, 1995
A method for calculating the dynamic transfer and stiffness matrices for a straight Timoshenko shear beam is presented. The method is applicable to beams with arbitrarily shaped cross sections and places no restrictions on the orientation of the element ...
Walter D. Pilkey, Levent Kitiş
doaj   +1 more source

Laboratory‐Based Time‐Resolved In Situ X‐Ray Absorption Spectroscopy for Tracking Transformations of Working Electrocatalysts

Chemistry–Methods, EarlyView.
The experimental setup presented in this work combining laboratory‐based X‐ray absorption spectroscopy with an electrochemical reactor advances the fundamental understanding of electrocatalysts at extended time scales. By the example of the electrochemical reduction of CO2, the parameters are discussed that are relevant for optimizing the system to ...
Martina Rüscher, Joon Baek Jang, Andrea Martini, Petrik Bischoff, Wiebke Frandsen, Janis Timoshenko, Beatriz Roldan Cuenya   +6 more
wiley   +1 more source

Non-Homogeneous Thermoelastic Timoshenko Systems

Bulletin of the Brazilian Mathematical Society, New Series, 2017
The well-established Timoshenko system is characterized by a particular relation between shear stress and bending moment from its constitutive equations. Accordingly, a (thermal) dissipation added on the bending moment produces exponential stability if and only if the so called “equal wave speeds” condition is satisfied.
M. S. Alves, M. A. Jorge Silva, T. F. Ma, J. E. Muñoz Rivera   +3 more
openaire   +2 more sources