Results 161 to 170 of about 1,423 (215)

Synergy of Pd Clusters and TiO2 {101} for Photocatalytic Nonoxidative Coupling of Methane

Advanced Science, EarlyView.
This study presents photocatalytic nonoxidative coupling of methane over cal‐Pd0.05/TiO2{101}, achieving near 100% selectivity and long‐term stability under mild flow conditions through synergistic single atoms and clusters catalysis. ABSTRACT Photocatalytic nonoxidative coupling of methane (NOCM) offers a sustainable route to valorize CH4 into C2 ...
Jianlong Yang, Annika S. Tang, Junwang Tang   +2 more
wiley   +1 more source

Insights Into CO2 Loss, pH Effects, and Tafel Kinetics in Ni Single Atom‐Driven Bicarbonate Electroreduction

Advanced Science, EarlyView.
Selective CO formation in bicarbonate electrolysis is achieved by retaining reactive CO2 and tuning pH, while the competing hydrogen evolution reaction occurs at the interface. The rate‐determining step couples the chemical equilibrium of bicarbonate/CO2 with electrochemical charge transfer, offering insight into optimizing reaction conditions for ...
Lin Li, Yi‐Jie Kong, Ting Zhang, Xu Han, Kristine Aalestrup, Steen Uttrup Pedersen, Xin‐Ming Hu, Kim Daasbjerg   +7 more
wiley   +1 more source

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Vibrations of a Plate with Periodically Changing Parameters

Vestnik St. Petersburg University, Mathematics, 2021
In this paper, the equation of vibrations of a plate with periodically changing parameters (material properties and thickness) are derived, and the eigenfrequencies are determined. Solution of the problem is obtained with the approximate theory (Bubnov-Galerkin method). The approximate results are presented by analytical formulas. Asymptotic averaging (
Naumova, N. V., Ivanov, D. N., Dorofeev, N. P.   +2 more
openaire   +2 more sources

Free Vibration of a Disordered Periodic Beam

Journal of Applied Mechanics, 1974
Using a first-order perturbation procedure the statistical properties of the natural frequencies and their associated normal modes of a disordered N-span beam are investigated. Two types of disorder are considered: the random deviation of span length from an ideal design value and the random fluctuation of the bending stiffness along the beam.
Lin, Y. K., Yang, J. N.
openaire   +1 more source

Active Isolation of Periodic Machinery Vibrations

Journal of Sound and Vibration, 1993
Abstract Passive systems for the isolation of machinery vibrations can be supplemented by active techniques. It is shown that using secondary force inputs in parallel with a passive isolation stage has considerable potential advantages, both in the improvement of isolator performance and in the stability of the mounted machine.
Jenkins, M. D., Nelson, P. A., Pinnington, R. J., Elliott, S. J.   +3 more
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Bouncing ball on a vibrating periodic surface

Chaos: An Interdisciplinary Journal of Nonlinear Science, 2018
We present an investigation of a partially elastic ball bouncing on a vertically vibrated sinusoidal surface. Following the work of McBennett and Harris [Chaos 26, 093105 (2016)], we begin by demonstrating that simple periodic vertical bouncing at a local minimum of the surface becomes unstable when the local curvature exceeds a critical value.
Avishai Halev, Daniel M. Harris
openaire   +3 more sources

Vibration of Rotationally Periodic Structures

Journal of Sound and Vibration, 1994
Abstract The purpose of this paper is to determine eigensolutions of a rotationally periodic structure P of period N in terms of those of the i th substructure S(i) of P. Let y(i) be the generalized displacement vector and f(i) be the generalized force vector at interface I(i) , where substructures S(i) and S(i - 1) are connected.
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Periodic vibration of plates with large displacements

19th AIAA Applied Aerodynamics Conference, 2001
An algorithm based on the shooting and Newton methods was used to solve the finite element (FE) equations of motion of isotropic plates. To validate it and to demonstrate that this algorithm has advantages when compared with other methods, results were compared with published ones.
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On Periodic Solutions of a Beam Vibration Equation

Differential Equations, 2018
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Periodic Control of Vibrations in Helicopters

IFAC Proceedings Volumes, 2000
Abstract The problem of rejecting periodic disturbances in helicopters is here addressed by means of a periodic LMI technique. The computational advantage offered by this technique allows to face the important case of helicopter operating at variable velocity.
Francesco A. Cuzzola, Sergio Bittanti
openaire   +1 more source