Results 71 to 80 of about 368,669 (336)

A Modification Fractional Homotopy Perturbation Method for Solving Helmholtz and Coupled Helmholtz Equations on Cantor Sets

Fractal and Fractional, 2019
In this paper, we apply a new technique, namely, the local fractional Laplace homotopy perturbation method (LFLHPM), on Helmholtz and coupled Helmholtz equations to obtain analytical approximate solutions.
D. Baleanu, H. Jassim
semanticscholar   +1 more source

Near‐Field Electrospinning Micro‐Printhead Achieves Precise Control of Nanofiber Deposition

Advanced Engineering Materials, EarlyView.
A micro‐printhead for near‐field electrospinning enables reproducible deposition of polymer nanofibers with diameters below 50 nm. Systematic parameter studies uncover the mechanisms linking operating conditions to fiber morphology, paving the way for precise and low‐cost nanoscale 3D manufacturing.As a high‐resolution, cost‐effective, and rapid ...
Han Xu, Dario Mager, Jan G. Korvink
wiley   +1 more source

Acoustic waveguide frequency-selective demultiplexing realized by Helmholtz-resonator-mediated extraordinary acoustic transmission

AIP Advances
An acoustic frequency-selective Y-shaped waveguide splitter based on in-line Helmholtz resonators is demonstrated analytically via a modified transfer matrix method, computationally through finite element simulations using COMSOL, and experimentally by ...
William M. Robertson, Kyle Sprague, Tague Carlyon   +2 more
doaj   +1 more source

Experimental realization of extraordinary acoustic transmission using Helmholtz resonators

AIP Advances, 2015
The phenomenon of extraordinary acoustic transmission through a solid barrier with an embedded Helmholtz resonator (HR) is demonstrated. The Helmholtz resonator consists of an embedded cavity and two necks that protrude, one on each side of the barrier ...
Brian C. Crow, Jordan M. Cullen, William W. McKenzie, Vijay Koju, William M. Robertson   +4 more
doaj   +1 more source

Semi-basic 1-forms and Helmholtz conditions for the inverse problem of the calculus of variations

, 2009
We use Fr\"olicher-Nijenhuis theory to obtain global Helmholtz conditions, expressed in terms of a semi-basic 1-form, that characterize when a semispray is locally Lagrangian.
Bucataru, Ioan, Dahl, Matias F.
core   +1 more source

Non-linear dynamics of Kelvin-Helmholtz unstable magnetized jets: three-dimensional effects [PDF]

, 1999
A numerical study of the Kelvin-Helmholtz instability in compressible magnetohydrodynamics is presented. The three-dimensional simulations consider shear flow in a cylindrical jet configuration, embedded in a uniform magnetic field directed along the jet
Bodo G., G. Tóth, Keppens R., R. Keppens, Tóth G., Tóth G.   +5 more
core   +2 more sources

Air‐Pressure–Actuated Vibroacoustic Metamaterial With Tunable Bandgap: Design, Modeling, and Characterization

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, Michael M. Becker, Sarah C. L. Fischer   +2 more
wiley   +1 more source

Using a Divergence Regularization Method to Solve an Ill-Posed Cauchy Problem for the Helmholtz Equation

Abstract and Applied Analysis, 2022
The ill-posed Helmholtz equation with inhomogeneous boundary deflection in a Hilbert space is regularized using the divergence regularization method (DRM).
Benedict Barnes, Anthony Y. Aidoo, Joseph Ackora-Prah   +2 more
doaj   +1 more source

FEM Investigation of a Multi-Neck Helmholtz Resonator

Applied Sciences, 2023
An increasingly significant area of research with several applications in numerous disciplines is that of multi-neck Helmholtz resonators. This research is set to explore the accuracy and applicability of the finite element method (FEM) for the ...
Nikolaos M. Papadakis, Georgios E. Stavroulakis   +1 more
doaj   +1 more source

Dust sedimentation and self-sustained Kelvin-Helmholtz turbulence in protoplanetary disk mid-planes. I. Radially symmetric simulations

, 2006
We perform numerical simulations of the Kelvin-Helmholtz instability in the mid-plane of a protoplanetary disk. A two-dimensional corotating slice in the azimuthal--vertical plane of the disk is considered where we include the Coriolis force and the ...
Anders Johansen, Barge P., Chavanis P. H., Fromang S., Hodgson L. S., Hubert Klahr, Ishitsu N., Sekiya M., Thomas Henning, Weidenschilling S. J.   +9 more
core   +1 more source