Results 121 to 130 of about 7,095 (298)

Backward-Wave Oscillation Criterion in a Step-Tapered Helix Travelling-Wave Tube

, 2009
Analysis of backward-wave oscillation criterion is one of the essential steps for designing a broadband travelling-wave tube (TWT) amplifier. In this paper, a methodology for the analysis of the backward-wave oscillation criterion in a helix travelling ...
Datta, S. K.
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Over 10‐W, 2.0‐μm, Broadband, All‐Fiber Amplified Spontaneous Emission Source Based on Spectrum Combination

Advanced Photonics Research
Herein, Tm‐doped fiber (TDF) amplified spontaneous emission (ASE) and Ho‐doped fiber ASE to realize a high‐power, 2.0‐μm‐broadband, all‐fiber ASE source are combined.
Junjia Ding, Kehui Zhai, Deqin Ouyang, Yewang Chen, Minqiu Liu, Junqing Zhao, Xu Wu, Qitao Lue, Shuangchen Ruan, Jinzhang Wang, Chunyu Guo, Peiguang Yan   +11 more
doaj   +1 more source

Surface Charges Guided Quasi‐TEM‐mode Microwave Propagation along Dielectric Nanowire

Advanced Physics Research, EarlyView.
According to Maxwell's equations, a single‐conductor transmission line cannot allow TEM‐mode electromagnetic wave propagation, however, this is based upon the assumption that dielectric material is isolated from the environment. In practice, surface electrostatic charges widely existed in nano‐materials with large surface‐to‐volume ratio.
BoYan Xu, Kaibo Zhang, Haojie Gao, Zhiyuan Gao, Kai Wang, Lihuan Zhao, Qi Yang, Bifeng Cui   +7 more
wiley   +1 more source

A Fast Estimation of the Intrinsic Low-Frequency Oscillation Modes of Modular Multilevel Converter Based on AC Impedance Modeling

Complex power electronic topologies, such as modular multilevel converter (MMC), frequently experience broadband oscillation. To reveal the theoretical mechanism, this article models MMC based on linear-time-periodic-variable (LTPV) approach and obtains ...
Chung, Sunjae,, Wang, Na,, Ding, Yike,, Shang, Xiaolei,, Chen, Jikai,   +4 more
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Guiding and Manipulating Light Fields in Microstructured Liquid Crystals

Advanced Physics Research, EarlyView.
This review summarizes recent advances in guided‐wave optics enabled by microstructured liquid crystal (LC) devices, covering their fundamental material properties, key degree of freedom for dynamic light field manipulations. The advances of linear guided‐wave optics, nonlinear‐optics with spatial optical solitons, and microlasers in LC‐based devices ...
Shan‐shan Chang, Yong‐shuai Li, Jin‐hui Chen   +2 more
wiley   +1 more source

Strong Radiation Emission from Plasma Dipole Oscillation

, 2018
The plasma oscillation and Langmuir wave are usually regarded as non-radiating, because their electrostatic, curlfree nature of the electric field prohibits its coupling with the electromagnetic wave in plasma. However, in a nonuniform plasma, the plasma
Hur, Min Sup, Fisch, Nathaniel, Ersfeld, Bernhard, Jaroszynski, Dino, Kang, Teyoun, Qu, Kenan   +5 more
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Parametric Oscillation, Frequency Mixing, and Injection Locking of Strongly Coupled Nanomechanical Resonator Modes

, 2017
We study locking phenomena of two strongly coupled, high quality factor nanomechanical resonator modes to a common parametric drive at a single drive frequency in different parametric driving regimes.
Michael J. Hartmann, Ridolfo, Alessandro, Seitner, Maximilian J., Abdi, Mehdi, Hartmann, Michael J., Maximilian J. Seitner, Seitner, Maximilian, Alessandro Ridolfo, Eva M. Weig, Weig, Eva M., Mehdi Abdi   +10 more
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Comprehensive DFT Analysis of FeSi and RhSi: Structural Stability, Electronic Contrast and Transport‐Optical Responses

Advanced Physics Research, EarlyView.
This comprehensive density functional theory analysis investigates the structural, electronic, optical, mechanical, and thermoelectric properties of FeSi, c‐RhSi, and o‐RhSi. Results reveal distinct electronic and optical contrasts among the materials.
Md Farhan Hassan, Shaher Azad, Md Salim Hossain, Suptajoy Barua, Md Kamruzzaman   +4 more
wiley   +1 more source

Polarization of decayless kink oscillations in a 3D MHD coronal loop model

Astronomy & Astrophysics
Decayless kink oscillations are frequently observed in solar coronal loops and are considered potential contributors to coronal heating. Despite the ubiquity of this wave phenomenon, its driving mechanism remains unclear.
Mandal Sudip, Breu Cosima, Peter Hardi
doaj   +1 more source

Comparison of impedance measured by the forced oscillation technique and pulmonary functions, including static lung compliance, in obstructive and interstitial lung disease

, 2019
Naoya Takeichi,1 Haruna Yamazaki,1 Keisaku Fujimoto21Department of Biomedical Laboratory Sciences, Graduate School of Medicine, Shinshu University, Matsumoto, Nagano, Japan; 2Department of Clinical Laboratory Sciences, Shinshu University School of Health
Yamazaki H, Takeichi N, Fujimoto K
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