Results 51 to 60 of about 7,653 (211)

C∞‐Structures for Liénard Equations and New Exact Solutions to a Class of Klein–Gordon Equations

Mathematical Methods in the Applied Sciences, Volume 49, Issue 4, Page 2795-2822, 15 March 2026.
ABSTRACT Liénard equations are analyzed using the recent theory of 𝒞∞‐structures. For each Liénard equation, a 𝒞∞‐structure is determined by using a Lie point symmetry and a 𝒞∞‐symmetry. Based on this approach, a novel method for integrating these equations is proposed, which consists in solving sequentially two completely integrable Pfaffian equations.
Beltrán de la Flor, Adrián Ruiz, Concepción Muriel   +2 more
wiley   +1 more source

2FSK Communication System Demodulation Algorithm for Novel Acoustically Excited SLF Antennas

水下无人系统学报
There exist some problems for acoustically excited super low frequency(SLF) antennas, such as low transmission power and low received signal-to-noise ratio. In addition, it is difficult to design a narrow-band filter in traditional binary frequency-shift
Xiayu ZHANG, Jiahao ZHANG, Jie JIAO, Yi LIU   +3 more
doaj   +1 more source

Unusual Nonpolynomial Van der Pol Oscillator Equations With Exact Harmonic and Isochronous Solutions

International Journal of Analysis and Applications, 2022
We do not know Van der Pol-type equations with nonlinear restoring force having explicitly an exact periodic solution. We present, for the first time, nonpolynomial Van der Pol oscillator equations that do not satisfy the classical existence theorems. We
Kolawolé Kêgnidé Damien Adjaï, Marcellin Nonti, Jean Akande, Marc Delphin Monsia   +3 more
doaj   +1 more source

Rare quantum metastable states in the strongly dispersive Jaynes-Cummings oscillator [PDF]

, 2018
We present evidence of metastable rare quantum-fluctuation switching for the driven dissipative Jaynes-Cummings oscillator coupled to a zero-temperature bath in the strongly dispersive regime.
Asari, U., Barratt, F., Ginossar, E., Mavrogordatos, Th. K., Szafulski, P., Szymańska, M. H.   +5 more
core   +3 more sources

Strictly Positive Solutions of Neumann Boundary Value Problems and Applications to Duffing Type Models

Mathematical Methods in the Applied Sciences, Volume 49, Issue 3, Page 1943-1956, February 2026.
ABSTRACT The existence of one or two strictly positive solutions of Neumann boundary value problems is studied in this paper where the nonlinearities are L1$$ {L}^1 $$‐Carathéodory functions, so they are not necessarily continuous. Additional weaker and better conditions than those used in previous results are posted on the nonlinearities to obtain ...
Kunquan Lan, Gustavo Cicchini Santos
wiley   +1 more source

Needle in a Haystack: Information Recovery in Low Signal‐to‐Noise Piezoresponse Force Microscopy Data

Small Methods, Volume 10, Issue 2, 22 January 2026.
Reconstruction of low signal‐to‐noise ratio signals enables improved information recovery in piezoresponse force microscopy data, even in data with a substantial amount of noise. Incorporating signal processing errors to detect and Bayesian matrix completion methods to reconstruct low SNR signals substantially alters the apparent PFM switching ...
Kerisha N. Williams, Henry Shaowu Yuchi, Gardy Kevin Ligonde, Mathew Repasky, Yao Xie, Nazanin Bassiri‐Gharb   +5 more
wiley   +1 more source

Tunable Broadband Transparency of Macroscopic Quantum Superconducting Metamaterials [PDF]

, 2015
Narrow-band invisibility in an otherwise opaque medium has been achieved by electromagnetically induced transparency (EIT) in atomic systems. The quantum EIT behaviour can be classically mimicked by specially engineered metamaterials via carefully ...
Anlage, Steven. M., Mukhanov, Oleg, Trepanier, Melissa, Zhang, Daimeng   +3 more
core   +3 more sources

Piezoelectric Ceramic Resonator for Physical Reservoir Computing

Electronics Letters, Volume 62, Issue 1, January/December 2026.
This work presents a feedback‐free, maskless physical reservoir computing based on a Pb(Zr,Ti)O3 piezoelectric ceramic disc resonator that harnesses intrinsic Duffing nonlinearity and underdamped transients. A nonlinear equivalent‐circuit model quantifies the mechanism, and the computational capability is validated via end‐to‐end simulations ...
Senhao Wang, Xiaosheng Wu
wiley   +1 more source

Confusion threshold study of the Duffing oscillator with a nonlinear fractional damping term

Journal of Low Frequency Noise, Vibration and Active Control, 2021
In this study, the critical conditions for generating chaos in a Duffing oscillator with nonlinear damping and fractional derivative are investigated. The Melnikov function of the Duffing oscillator is established based on Melnikov theory.
Wang Mei-Qi, Ma Wen-Li, Chen En-Li, Yang Shao-Pu, Chang Yu-Jian, Wanjie Zhang   +5 more
doaj   +1 more source

Aggregation‐Induced Triplet Symmetry‐Breaking Charge Separation Drives Electron Transfer for Autophagy Blockade‐Enhanced Type‐I Photodynamic Therapy

Aggregate, Volume 6, Issue 12, December 2025.
This study presents a novel class of cyanine‐based photosensitizers (PS) to achieve controllable switching between Type‐I and Type‐II mechanisms during photodynamic therapy. The formation of radical ion pairs (PS•+−PS•−) via symmetry‐breaking charge separation in aggregated systems at the triplet state, triggering Type‐I cascade reactions for effective
Xin Li, Fuping Han, Xiao Zhou, Hongyi Zhang, Tiancong Shi, Lihan Cai, Danhong Zhou, Weijie Chi, Saran Long, Wen Sun, Jianjun Du, Jiangli Fan, Xiaojun Peng   +12 more
wiley   +1 more source