Results 51 to 60 of about 85,320 (260)

Influence of Grid Aperture Ratio on Electron Transmittance and Electron Beam Spot Size in Field Emission Processes of Carbon Nanotubes

Applied Sciences
Field emission is an important work mode for electron sources, and carbon nanotubes (CNTs) have been extensively studied for their good emission properties.
Yongbo Li, Xinchuan Liu, Shichao Feng, Yuanxun Li, Xiaodong Sun, Aiwei Wang, Ke Chen, Shenghan Zhou, Chi Li, Liye Zhao, Zhenjun Li   +10 more
doaj   +1 more source

A Multi-Stage Model for the Electromagnetic Shielding Effectiveness Prediction of an Infinite Conductor Plane With Periodic Apertures

IEEE Access, 2019
This paper focuses on the shielding effectiveness (SE) prediction of the periodic aperture array on an infinite conductor plane against a plane electromagnetic wave with its wavelength much larger than the size of a unit cell of the array.
Wanxin Bai, Anqi Guo, Tianle Li, Ruiqi Cheng, Chongqing Jiao   +4 more
doaj   +1 more source

Investigation of transformers' turn ratios and design procedure for an aperture coupled slot antenna

Active RF Devices, Circuits and Systems Seminar, 2011
An aperture coupled antenna consists of feed, slot, and a radiation patch. The feed is normally a microstrip line with the slot etched in the ground plane and the radiating patch is located above the ground plane. To obtain maximum power transfer the microstrip line is orientated at right angle to the slot to obtain tight coupling. It is shown by Pozar
Liu, Lei, Ghassemlooy, Zabih, Sambell, Alistair, Danaher, Sean, Lu, Qing, Korolkiewicz, Edward   +5 more
openaire   +2 more sources

Electrocapillary Modulated Interfacial Tension Amplifies Liquid Metal Transduction

Advanced Functional Materials, EarlyView.
This study presented an electrocapillary‐enhanced magnetohydrodynamic pumping strategy that harnesses the Lorentz force and interfacial tension modulation of liquid metal droplets to achieve amplified fluidic power. The system enabled low‐voltage, self‐oscillating fluidic transduction with enhanced pressure and flow generation, supporting compact ...
Saba Firouznia, Ciqun Xu, Michael D. Dickey, Jonathan Rossiter   +3 more
wiley   +1 more source

Simulation of Water Entry Jet and Cavitation Characteristics of Hollow Projectiles

水下无人系统学报
In the water entry process of hollow projectiles, the formation of high-speed water jets is a crucial factor influencing their water entry. In order to study the influence of the through-hole aperture of hollow projectiles on jet and water entry ...
Junbang XIANG, Xiaoguang WANG, Huifeng KANG, Jialin XUAN, Liu YANG   +4 more
doaj   +1 more source

Comparative study on absorbing characteristics of aperture-type and patch-type FSS

Journal of Aeronautical Materials, 2020
Aperture-type and patch-type frequency selective surfaces (FSS) were prepared by using carbon fiber paper containing carbon fiber. Using honeycomb as the matching dielectric layer, microscopic characterization of carbon fiber distribution in carbon fiber
YUAN Xujiong, LIU Wenyan, WANG Yan, LU Zetao, ZHANG Youwei, HAN Muchou, LI Xiao, LIU Min   +7 more
doaj   +1 more source

Low‐Profile, High‐Gain GRIN RF Lenses via Multi‐Material Vat Photopolymerization

Advanced Functional Materials, EarlyView.
We investigate the opportunity of leveraging multi‐material vat photopolymerization printing to manufacture intricate lenses exhibiting permittivity gradients that can increase signal gain in transmitted radiofrequency signals in the X‐ and Ku‐bands. Lenses produced with more distinct low‐loss materials (up to 5) can deliver an 18 dB signal gain with a
Lawrence Romangsuriat, Alexander Peraire‐Bueno, A. John Hart, Randall M. Erb   +3 more
wiley   +1 more source

Influence of diffraction by a rectangular aperture on the aspect ratio of femtosecond direct-write waveguides

Optics Express, 2005
Rectangular apertures have been used as a simple means to approximate elliptical Gaussian beams in femtosecond direct writing systems to correct for the elongated focus inherent in low numerical aperture (NA) systems. In this work it is recognized that the rectangular aperture, more accurately functions as a diffractive element and hence redistributes ...
K, Moh, Y, Tan, X-C, Yuan, D, Low, Z, Li
openaire   +2 more sources

Shaping Matter with Acoustic Waves: From Particles to Functional Structures

Advanced Functional Materials, EarlyView.
Acoustic‐directed assembly is reviewed as a materials‐oriented strategy for organizing particles, polymers, metals, and biological systems into functional structures. The review distinguishes reversible manipulation from permanent structure formation through medium fixation, particle fixation, and in situ material generation, highlighting routes toward
Avraham Kenigsberg, Shelly Zlotnikov, Maya Fiorentino, Yuval Elias, Ornit Nagler‐Avramovitz, Hagay Shpaisman   +5 more
wiley   +1 more source

Microscopic Origin of Temperature‐Dependent Anisotropic Heat Transport in Ultrawide‐Bandgap Rutile GeO2

Advanced Functional Materials, EarlyView.
Rutile GeO2${\rm GeO}_{2}$ exhibits orientation‐dependent heat transport with temperature‐dependent anisotropy, showing higher cross‐plane thermal conductivity along [001] than along the equivalent in‐plane [100] and [010] directions. Temperature‐dependent TDTR measurements and first‐principles phonon calculations identify the microscopic phonon ...
Pouria Emtenani, Marta Loletti, Felix Nippert, Eduardo Bedê Barros, Zbigniew Galazka, Hans Tornatzky, Christian Thomsen, Juan Sebastián Reparaz, Riccardo Rurali, Markus R. Wagner   +9 more
wiley   +1 more source