Results 41 to 50 of about 7,200,285 (346)

Monitoring ultrafast vibrational dynamics of isotopic molecules with frequency modulation of high-order harmonics

Nature Communications, 2018
Molecules constituted by different isotopes are different in vibrational modes, making it possible to elucidate the mechanism of a chemical reaction via the kinetic isotope effect.
Lixin He, Qingbin Zhang, P. Lan, W. Cao, Xiaosong Zhu, Chunyang Zhai, Feng Wang, Wenjing Shi, Muzi Li, Xue-Bin Bian, P. Lu, A. Bandrauk   +11 more
semanticscholar   +1 more source

Comparative Analysis of Mathematical Models of Tracking Radio Altimeters

Известия высших учебных заведений России: Радиоэлектроника, 2022
Introduction. Tracking radio altimeters of low altitudes are widely used in civil aviation. These devises use periodic frequency modulated continuous wave (FMCW) signals, while altitude measurements are based on processing the beat signal processing. For
A. A. Monakov, A. A. Tarasenkov
doaj   +1 more source

A Novel Strategy for Signal Denoising Using Two-Layer SVD and Its Application to Rub-Impact Fault Diagnosis of Aeroengine

Applied Sciences, 2022
The rub-impact fault, which occurs in the aeroengine, can cause frequency modulation (FM) in its vibration signal. Oscillated instantaneous frequency (IF) is a phenomenon of such a modulation mode, which carries critical fault information from the ...
Peng Zhang, Shunming Li, Kun Xu, Siqi Gong, Keyi Zhan, Maoxian Shen, Jun Tian, Xin Yuan   +7 more
doaj   +1 more source

A Low Inrush Current Pre-Charging Strategy of M3C with Improved Nearest Level Modulation

Energies
The modular multilevel matrix converter (M3C) can perform AC/AC conversion directly. However, M3C operation often requires a pre-charging process, which can be challenging due to the need for fast pre-charging with low inrush current.
Rufei He, Yikai Li, Yumin Peng, Yiming Ma, Fanqi Huang, Hailong Li, Wei Luo   +6 more
doaj   +1 more source

Measurement and Control System for Atomic Force Microscope Based on Quartz Tuning Fork Self-Induction Probe

Micromachines, 2023
In this paper, we introduce a low-cost, expansible, and compatible measurement and control system for atomic force microscopes (AFM) based on a quartz tuning fork (QTF) self-sensing probe and frequency modulation, which is mainly composed of an embedded ...
Yongzhen Luo, Xidong Ding, Tianci Chen, Tao Su, Dihu Chen   +4 more
doaj   +1 more source

Switching management in couplers with biharmonic longitudinal modulation of refractive index

, 2009
We address light propagation in couplers with longitudinal biharmonic modulation of refractive index in neighboring channels. While simplest single-frequency out-of-phase modulation allows suppression of coupling for strictly defined set of resonant ...
Ablowitz, Della Valle, Dreisow, Eisenberg, Garanovich, Grossmann, Iyer, Kartashov, Kartashov, Kartashov, Kartashov, Lederer, Longhi, Longhi, Longhi, Luo, Rosberg, Staliunas, Staliunas, Szameit, Szameit, Szameit, Szameit, Victor A. Vysloukh, Yaroslav V. Kartashov   +24 more
core   +1 more source

A Hybrid Frequency Selective Absorber With Dual-Polarized Wireless Communication and Ultra-Wideband Absorption

IEEE Open Journal of Antennas and Propagation
Traditional multi-layer frequency selective absorbers (FSAs) with antenna circuit suffer from inter-layer interference, which can adversely affect the in-band frequency bandwidth of wireless communication (fractional bandwidth FBW <20% in ...
Youquan Wen, Sai-Wai Wong, Chunlin Ji, Ruopeng Liu, Yejun He   +4 more
doaj   +1 more source

Effect of plasma resonances on dynamic characteristics of double graphene-layer optical modulator

, 2012
We analyze the dynamic operation of an optical modulator based on double graphene-layer(GL) structure utilizing the variation of the GL absorption due to the electrically controlled Pauli blocking effect. The developed device model yields the dependences
Leiman, V. G., Mitin, V., Otsuji, T., Ryzhii, M., Ryzhii, V., Shur, M. S., Yurchenko, S. O.   +6 more
core   +1 more source

Modeling and Analysis of Microwave Emission from Multiscale Soil Surfaces Using AIEM Model

Remote Sensing, 2022
Natural rough surfaces have inherent multiscale roughness. This article presents the modeling and analysis of microwave emission from a multiscale soil surface.
Ying Yang, Kun-Shan Chen, Rui Jiang
doaj   +1 more source

A Simple Variational Bayes Detector for Orthogonal Time Frequency Space (OTFS) Modulation [PDF]

IEEE Transactions on Vehicular Technology, 2019
The emerging orthogonal time frequency space (OTFS) modulation technique has shown its superiority to the current orthogonal frequency division multiplexing (OFDM) scheme, in terms of its capabilities of exploiting full time-frequency diversity and ...
W. Yuan, Zhiqiang Wei, Jinhong Yuan, Derrick Wing Kwan Ng   +3 more
semanticscholar   +1 more source