Results 101 to 110 of about 188,454 (278)

Spectrum of harmonic excitations on fractals

Journal de Physique, 1984
The density of states and the nature of the eigenmodes of the vibrating d-dimensional Sierpinski gasket are investigated. The results hold for the tight-binding or any general quadratic Hamiltonian. For d > 1, the spectral measure is shown to be a superposition of two distinct pure point measures of relative weights d/(d + 1) and 1/(d + 1).
openaire   +1 more source

Femtosecond photoelectron and photoion spectrometer with vacuum ultraviolet probe pulses

, 2014
We describe a setup to study ultrafast dynamics in gas-phase molecules using time-resolved photoelectron and photoion spectroscopy. The vacuum ultraviolet (VUV) probe pulses are generated via strong field high-order harmonic generation from infrared ...
Grilj, Jakob, Gühr, Markus, Koch, Markus, Sistrunk, Emily, Wolf, Thomas J. A.   +4 more
core   +1 more source

Miniature Nanomesh Mechano‐Acoustic Sensor with Wide Linear Dynamic Range, Broad Bandwidth, and Flat Frequency Response

Advanced Functional Materials, EarlyView.
A miniaturized mechano‐acoustic sensor is developed using an electrospun PVDF nanomesh as the diaphragm in a capacitive sensor structure. Unlike conventional nanomesh‐based sensors, it achieves high linear sensitivity, a broad and flat frequency response, and a compact form factor.
Jeng‐Hun Lee, Kang Hyuk Cho, Seojin Yun, Siyoung Lee, Woongji Kim, Yunsik Kim, Wonkyu Moon, Yoonyoung Chung, Kilwon Cho   +8 more
wiley   +1 more source

Application of PZT Ceramic Sensors for Composite Structure Monitoring Using Harmonic Excitation Signals and Bayesian Classification Approach. [PDF]

Materials (Basel), 2021
Dziendzikowski M, Heesch M, Gorski J, Dragan K, Dworakowski Z.   +4 more
europepmc   +1 more source

2D Calogero Model in the Collective-Field Approach

, 2004
We consider the large-N Calogero-Marchioro model in two dimensions in the Hamiltonian collective field approach based on the 1/N expansion. The Bogomol'nyi limit appears in the presence of the harmonic confinement.
Andrić, Andrić, Barashenkov, Basu-Mallick, Bhaduri, Bogoliubov, Calogero, Danijel Jurman, Date, Date, Feigel'man, Feynman, Ghosh, Ghosh, Ghosh, Ghosh, Ginibre, Iso, Jackiw, Jevicki, Kane, Khare, Khare, Khare, Mehta, Murthy, Oas, Sen, Velimir Bardek   +28 more
core   +1 more source

Tissue Harmonic Imaging with Coded Excitation

, 2011
It becomes more important to obtain medical ultrasound images with higher signal-to-noise ratio (SNR) and higher spatial resolution. In the last decade, tissue harmonic imaging (THI) and coded excitation to medical ultrasound imaging have been investigated.
Tanabe, Masayuki, Yamamura, Takuya, Okubo, Kan, Tagawa, Norio   +3 more
openaire   +3 more sources

A Bespoke Programmable Interpenetrating Elastomer Network Composite Laryngeal Stent for Expedited Paediatric Laryngotracheal Reconstruction

Advanced Functional Materials, EarlyView.
A programmable interpenetrating double‐network architecture, created via 3D‐TIPS printing and resin infusion, synergistically combines thermoplastic and thermosetting elastomers to balance structural rigidity and surface softness—crucial for paediatric laryngeal stents.
Elizabeth F. Maughan, Lei Wu, Dong Zhang, Linxiao Wu, Graca Ferreira Vaz Pinto Mendes, Wanqiao J. Tu, Heping Ma, Toby J. Proctor, Colin R. Butler, Thomas Kjærgaard, Mark W. Lowdell, Martin A. Birchall, Robert E. Hynds, Richard Hewitt, Wenhui Song   +14 more
wiley   +1 more source

Duffing-type oscillator under harmonic excitation with a variable value of excitation amplitude and time-dependent external disturbances. [PDF]

Sci Rep, 2021
Wawrzynski W.
europepmc   +1 more source

Harmonizing the Pyrene and Ether Groups in Covalent Triazine Polymers for Highly Effective H2O2 Photosynthesis via One‐Step Two‐Electron Oxygen Reduction

Advanced Functional Materials, EarlyView.
The pyrene and ether groups are incorporated into the covalent triazine polymer (CTP) structure. The synergistic effect of the two functional groups endows CTP with better electron transfer, light absorption, and oxygen activation properties. An impressive apparent quantum yield (13.2% @420 nm) and a remarkable solar‐to‐chemical conversion efficiency ...
Chong Wang, Jinliang Lv, Yichun Lu, Hanfeng Ye, Xuan Zhang, Leonardo Cancellara, Nadezda Tarakina, Jiande Lin, Xin Gao, Oleksandr Savateev, Jiajia Cheng   +10 more
wiley   +1 more source

A study of the effect of motor structural components on harmonic noise

Scientific Reports
This paper introduces the characteristics of the harmonic noise of the outdoor unit of air conditioner, analyzes the change of the noise sound pressure level and the corresponding spectral characteristics of the outdoor unit when the harmonic noise is ...
Weijie Zhang, Hao Li
doaj   +1 more source