Results 91 to 100 of about 43,359 (276)

Stability Analysis Method of a Hierarchical Control Structure Microgrid Based on a Small-Signal Model and Hopf Bifurcation Theory

International Journal of Electrical Power & Energy Systems
To the oscillation and stability problem caused by multi-scale and broadband electromagnetic dynamics among many isomerized power electronic devices in a microgrid, a small-signal model of hierarchical control structure microgrid and stability analysis ...
Xusheng Yang, Wei Chen, Lizhen Wu, Jiying Tuo, Nan Qiu   +4 more
doaj   +1 more source

The Cause and Eliminate Method of Self-excited Oscillation in Long Cable Amplifier Circuits

MATEC Web of Conferences, 2018
SMA long cable distributed capacitance is easy to trigger broadband amplifier circuit’s self-oscillation. In this study we design an amplifier circuit based on OPA691 chip, discuss the influence of long cable’s distributed capacitance, then prompt a ...
Wang Can, Huang Ming, Peng Zhaomin, Cui Jinbao   +3 more
doaj   +1 more source

Periodic spiking pulse formation in broadband nonlinear optoelectronic oscillator

Optics Express
An approach to generating periodic spiking pulses in a broadband opto-electronic oscillator (OEO) without external injection is proposed and demonstrated. Through biasing the electro-optic Mach-Zehnder modulator (MZM) in the OEO cavity at its nonlinear working point, spiking pulses are excited by the self-generated chaos under the combined action of ...
Qingbo Zhao, Huan Tian, Ziwei Xu, Lingjie Zhang, Zhiyao Zhang, Heping Li, Shangjian Zhang, Yong Liu   +7 more
openaire   +2 more sources

Development of Laterally Graded X‐Ray Multilayer Optics

Advanced Materials Technologies, EarlyView.
This work presents the development of laterally graded X‐ray multilayer optics with both constant and variable lateral gradients. By precisely controlling substrate speed profiles and mask design, these multilayers achieve highly accurate lateral gradients and excellent sagittal thickness uniformity, making them ideal for spectroscopy application at ...
Arindam Majhi, Wadwan Singhapong, Wai Jue Tan, Andrey Sokolov, Stefano Agrestini, Mirian Garcia‐Fernandez, Kejin Zhou, Andrew C. Walters, Chris Bowen, Alexander J.G. Lunt, Hongchang Wang, Kawal J. Sawhney   +11 more
wiley   +1 more source

Optical Phase-Space-Time-Frequency Tomography

, 2011
We present a new approach for constructing optical phase-space-time-frequency tomography (OPSTFT) of an optical wave field. This tomography can be measured by using a novel four-window optical imaging system based on two local oscillator fields balanced ...
Beck, Bertrand, Bollen, Boyer, Hillery, John, Kim Fook Lee, Kolobov, Kurtsiefer, Lee, Leibfried, Lvovsky, McAlister, Paul Rojas, Rachel Blaser, Raymer, Reil, Smith, Smithey, Toscano, Vogel, Wagner, Wigner, Wodkiewicz, Yong Meng Sua, Zurek   +25 more
core   +1 more source

Design and Fabrication of High Dielectric GRIN Lens for a Directive Antenna Using a Hybrid Filled Voxel Additive Manufacturing Technique

Advanced Materials Technologies, EarlyView.
Hybrid‐filled voxel AM enables integration of high‐permittivity materials into additively manufactured devices. Using this approach, a graded refractive index (GRIN) lens is demonstrated, achieving a 50% antenna size reduction with enhanced directivity.
Qianfang Zheng, Anna Radkovskaya, Kailun Xu, Ekaterina Shamonina, Patrick S. Grant   +4 more
wiley   +1 more source

Backward wave optical parametric oscillation in a waveguide

npj Nanophotonics
Backward wave oscillators represent a class of tunable sources of electromagnetic radiation that do not require a resonant cavity to satisfy the oscillation condition.
Patrick Mutter, Fredrik Laurell, Valdas Pasiskevicius, Andrius Zukauskas   +3 more
doaj   +1 more source

Terahertz Chiral Metamaterials Enabling Broadband Polarization Conversion Using Polarization Guiding Effect

Advanced Materials Technologies, EarlyView.
A broadband terahertz polarization rotator consisting of twistingly stacked silicon–air metagratings is designed based on the polarization guiding effect and experimentally shown to achieve 90° linear polarization rotation for both TE and TM incidences.
Yun‐Seok Choi, Tae Gwan Park, Antoinette J. Taylor, Hou‐Tong Chen, Abul K. Azad   +4 more
wiley   +1 more source

Semiannual oscillation, annual oscillation, quasibiennial oscillation, and solar cycle variation of the OH airglow emission in the mesopause region

Earth and Planetary Physics
The vertically integrated emission rate, centroid altitude, peak emission rate, and peak height of the hydroxyl (OH) airglow were calculated from Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED)/Sounding of the Atmosphere using ...
Sheng-Yang Gu, Dong Wang, YuSong Qin, Liang Tang, YaFei Wei, XianKang Dou   +5 more
doaj   +1 more source

Cascaded half-harmonic generation of femtosecond frequency combs in mid-IR [PDF]

, 2015
For the growing demand of frequency combs in mid-infrared (mid-IR), known as the "molecular fingerprint" region of the spectrum [1], down conversion of near-IR frequency combs through half- harmonic generation offers numerous benefits including high ...
Byer, Robert L., Ingold, Kirk A., Jankowski, Marc, Marandi, Alireza   +3 more
core   +1 more source