Results 91 to 100 of about 28,237 (308)

Low attenuation microwave waveguides

, 1974
PhDAn investigation of the dispersion and attenuation characteristics of cylindrical structures supporting guided electromagnetic waves with low attenuation is described.
Al-Hariri, Ali Mohammed Bakir
core  

Interferometry of ionospheric E-region irregularities based on Kunming VHF radars

Frontiers in Astronomy and Space Sciences
There is a long history of using VHF radar systems to detect ionospheric irregularities based on the theory of coherent scattering. According to previous work, there is a high occurrence of field-aligned irregularities (FAIs) in the ionospheric E-region ...
Bo Chen, Yihao Xu, Chen Zhou, Yuqiang Zhang, Yi Liu, Tong Xu, Bin Xu, Jian Feng, Ting Lan, Haiyin Qing, Zhongxin Deng, Xiang Wang, Xiang Wang, Xinmiao Zhang   +13 more
doaj   +1 more source

Deep Learning Inverse Design of Phase‐Change Reconfigurable Terahertz Metadevices for Multidimensional Secure Communication

Advanced Materials, EarlyView.
A deep learning inverse‐design framework is established to create versatile reconfigurable terahertz metadevices. By synergizing deep learning with phase‐change materials, this approach enables on‐demand customization of multidimensional electromagnetic responses.
Yisheng Dong, Xieyu Chen, Aarthy Nagarajan, Yi Yang, Zhihao Wang, Rui Yu, Chuang Zheng, Chunmei Ouyang, Xueqian Zhang, Tun Cao, Ranjan Singh, Zhen Tian   +11 more
wiley   +1 more source

PERTURBATION THEORY FOR ELECTROMAGNETIC WAVE SCATTERING IN RANDOM LAYERED STRUCTURES

, 2010
The problem of electromagnetic wave scattering in 3-D random layered structures, is analytical treated by relying on original results of the Boundary Perturbation Theory (BPT) and Volumetric-Perturbative Reciprocal Theory (VPRT), whose structured ...
Imperatore, Pasquale
core  

Double-walled carbon nanotube-based polymer composites for electromagnetic protection. [PDF]

, 2010
In this paper, we present a microwave absorber based on carbon nanotubes (CNT) dispersed inside a BenzoCycloButenw (BCB) polymer. The high aspect ratio and remarkable conductive characteristics of CNT give rise to good absorbing properties for ...
Flahaut, Emmanuel, Katia Grenier, Sébastien Pacchini, Dubuc, David, Grenier, Katia, David Dubuc, Emmanuel Flahaut, Pacchini, Sébastien   +7 more
core   +1 more source

Bias‐Field Free Single‐Frequency CW‐ODMR of Nitrogen‐Vacancy Centers in Diamond for the Detection of Transient Electrical Signals

Advanced Materials Interfaces, EarlyView.
Simplified quantum sensing technique for the detection of short electrical signals occurring in neuronal signaling or bioinspired technologies. We demonstrate a single frequency continuous‐wave optically detected magnetic resonance (CW‐ODMR) approach to sense signals that can be as short as 0.2 ms.
João Paulo Silva, Orlando D. Cunha, Pedro Magalhães, Filipe Camarneiro, Jana B. Nieder   +4 more
wiley   +1 more source

Wiener-Hopf solution for impenetrable wedges at skew incidence [PDF]

, 2006
A new Wiener-Hopf approach for the solution of impenetrable wedges at skew incidence is presented. Mathematical aspects are described in a unified and consistent theory for angular region problems.
V.G. Daniele, V.G, Daniele, G. Lombardi, DANIELE, Vito, Lombardi, Guido   +4 more
core   +1 more source

High‐Sensitivity Terahertz Gas Sensing Enabled by Undercut Metal‐Dielectric‐Metal Metamaterial

Advanced Materials Interfaces, EarlyView.
A terahertz (THz) metamaterial gas sensor is demonstrated using a metal–dielectric–metal (MDM) absorber with an undercut dielectric layer, which enlarges the gas‐replaced volume and strengthens refractive‐index perturbation of the resonant mode. A reflection dip at 0.766 THz is observed, and acetone–nitrogen tests yield concentration‐dependent shifts ...
Naoki Inomata, Yuki Sakai, Yoshiaki Kanamori   +2 more
wiley   +1 more source

Millimetre wave imaging for concealed target detection

, 2011
PhDConcealed weapon detection (CWD) has been a hot topic as the concern about pub- lic safety increases. A variety of approaches for the detection of concealed objects on the human body based on earth magnetic ¯eld distortion, inductive magnetic ¯eld,
Zhang, Lianhong
core  

Two Dimensional Full‐Wave Modeling of Propagation of Low‐Altitude Hiss in the Ionosphere

Geophysical Research Letters, 2020
We investigate the propagation characteristics of low‐altitude hiss in the ionosphere by numerical simulation with a two‐dimensional full‐wave model. The simulation results demonstrate that linear mode conversion from whistler to H+ band electromagnetic ...
Xiang Xu, Chen Zhou, Lunjin Chen, Zhiyang Xia, Xu Liu, Jamesina J. Simpson, Yuannong Zhang   +6 more
doaj   +1 more source