Results 31 to 40 of about 125,191 (194)

Hybrid-equilibrium elements with control of spurious kinematic modes

Computer Assisted Methods in Engineering and Science, 2023
A review is presented of a recent formulation of hybrid-equilibrium elements for modelling planar structural problems. The formulation is based on the use of polynomials of general degree to approximate internal stress fields and bounding side ...
Edward Anthony Ward Maunder, Jose Paulo Moitiniho de Almeida   +1 more
doaj  

Wideband Bandpass TM Cavity Filters With Wide Spurious Free Band

IEEE Access, 2023
Recently, the spurious self-suppression method has been introduced and applied to the bandpass TM cavity filters to improve their stopband performance. However, this method has the limitation of being applicable only to TM narrow-band filters. This paper
Abdul Rehman, Cristiano Tomassoni
doaj   +1 more source

Stabilized four-node tetrahedron with nonlocal pressure for modeling hyperelastic materials [PDF]

, 2008
Non-linear hyperelastic response of reinforced elastomers is modeled using a novel three-dimensional mixed finite element method with a nonlocal pressure field. The element is unconditionally convergent and free of spurious pressure modes.
Areias, P., Matou, K.
core   +1 more source

Abnormal phenomena in a one-dimensional periodic structure containing left-handed materials

, 2002
The explicit dispersion equation for a one-dimensional periodic structure with alternative layers of left-handed material (LHM) and right-handed material (RHM) is given and analyzed. Some abnormal phenomena such as spurious modes with complex frequencies,
A. V. Kuznetsov, C. T. Chan, D. Sarid, D.R. Smith, F. Yang, G. C. Cho, I. S. Nefedov, J. B. Pendry, J. Gerardin, J.B. Pendry, K. J. Yee, L. Wu, Liang Wu, Linfang Shen, Michael W. Feise, N. Garcia, R. W. Ziolkowski, R.A. Shelby, R.A. Shelby, Sailing He, V.G. Veselago, Z. M. Zhang   +21 more
core   +1 more source

In-band spurious suppression in first-order antisymmetric-mode resonators using air holes and half electrode

Engineering Science and Technology, an International Journal
Laterally excited bulk acoustic resonator (XBAR) exhibits a high electromechanical coupling coefficient (kt2) due to their intrinsically superior piezoelectric properties, which is highly advantageous for the subsequent design and implementation of ...
Shitao Lv, Dongchen Sui, Qiner Xu, Yi Cao, Qiang Xu, Haiyan Sun, Tengfei Xu, Jicong Zhao   +7 more
doaj   +1 more source

Elimination of spurious modes within QRPA

, 2018
13 pages, 7 figures, to be published in Phys.
Repko, A., Kvasil, J., Nesterenko, V. O.
openaire   +2 more sources

Nanoscale imaging of super-high-frequency microelectromechanical resonators with femtometer sensitivity

Nature Communications, 2023
Implementing MEMS resonators calls for detailed microscopic understanding of the devices and imperfections from microfabrication. Lee et al. imaged super-high-frequency acoustic resonators with a spatial resolution of 100 nm and a displacement ...
Daehun Lee, Shahin Jahanbani, Jack Kramer, Ruochen Lu, Keji Lai   +4 more
doaj   +1 more source

Removal of Spurious Admixture in a Self-consistent Theory of Adiabatic Large Amplitude Collective Motion

, 2005
In this article we analyse, for a simple model, the properties of a practical implementation of a fully self-consistent theory of adiabatic large-amplitude collective motion using the local harmonic approach.
Almehed D, Blaizot J P, Bohr A, Klein A, Kobayasi M Nakatsukasa T Matsuo M Matsuyanagi K, Kobayasi M Nakatsukasa T Matsuo M Matsuyanagi K, Nakatsukasa T, Nakatsukasa T, Niels R Walet, Ring P, Toby D Young   +10 more
core   +1 more source

Collective inertia of Nambu-Goldstone mode from linear response theory [PDF]

, 2015
Background: Spurious zero-energy Nambu-Goldstone (NG) modes appear when the symmetry of a system is spontaneously broken. The Thouless-Valatin inertia, the collective inertia of the NG mode, contains important information concerning collective motion ...
Hinohara Nobuo, 日野原 伸生
core   +2 more sources

Spurious Modes in Dirac Calculations and How to Avoid Them

, 2013
In this paper we consider the problem of the occurrence of spurious modes when computing the eigenvalues of Dirac operators, with the motivation to describe relativistic electrons in an atom or a molecule.
Lewin, Mathieu, Séré, Eric
core   +2 more sources