Results 151 to 160 of about 758,632 (333)

In Situ Polyurea Integration for Self‐Healing, Durable Transparent Electromagnetic‐Interference Shielding Film

Advanced Science, EarlyView.
A steric‐hindrance molecular engineering strategy uses dimethyl maleate (DMM) to convert poly(1,4‐butanediol) bis(4‐aminobenzoate) (PBDAB) into a precursor with reduced reactivity via Michael addition, thereby retarding the curing process to form a transparent, ultraflexible, and self‐healable secondary‑amine polyurea (PuSA) with a crosslinked network.
Sinan Zheng, Shanyu Zhao, Gengjiang Yao, Yue Liu, Fei Pan, Mingrui Han, Zecheng Li, Shanbo Li, Jiurong Liu, Na Wu, Zhihui Zeng   +10 more
wiley   +1 more source

Tunable broadband terahertz absorber based on graphene with bilayer hexagonal

AIP Advances
An ultra-wideband absorber with an absorption rate of near unit is studied and numerically simulated in the terahertz frequency band. The proposed absorber is a stacked compact structure consisting of a double-layer patterned graphene embedded between ...
Maixia Fu, Na Xia, Yule Duan, Fei Zhou, Yinsheng Li   +4 more
doaj   +1 more source

Robust Physical-Layer Key Generation Using UWB in Industrial IoT: A Measurement-Based Analysis

Journal of Sensor and Actuator Networks
This paper addresses the confidentiality of wireless communications in industrial internet-of-things environments by investigating the feasibility of secret key generation for link-layer encryption using ultra wideband (UWB) signals.
Lorenzo Mario Amorosa, Stefano Caputo, Lorenzo Mucchi, Gianni Pasolini   +3 more
doaj   +1 more source

Ultra-Wideband Array Antennas

, 2014
Wireless communication has become an indispensable part of modern life. One of the mostimportant components of wireless communication systems are antennas, termed as "eyes" and "ears" of communication systems. A printed antenna, one of the most commercial antennas, is widely used for civil and military applications, i.e., for communication systems ...
openaire   +2 more sources

Programmable Hydration Pathways Enable Reconfigurable Ionic Thermoelectrics for Energy Harvesting and Thermal‐Tactile Interaction

Advanced Science, EarlyView.
Programmable hydration pathways enable reconfigurable ionic thermoelectrics in polyquaternium hydrogels. By coupling microscopic solvation, mesoscale water channels, and macroscopic boundary control, hydration‐gated protonics decouples thermopower, response speed, and stability.
Zehao Zhao, Yun Shen, Dongyan Xu
wiley   +1 more source

Multidimensional and Multifunctional Laser‐Induced Graphene (LIG) for Point‐of‐Care and Wearable Biosensing, Theranostics, and Bioactive Interfaces Toward Personalized Healthcare and Regenerative Medicine

Advanced Science, EarlyView.
Multidimensional laser‐induced graphene (LIG) spanning from 0D to 3D architectures is comprehensively reviewed for multifunctional biomedical platforms, including biosensing, theranostics, and bioactive interface applications, which highlights its potentials for point‐of‐care diagnostics, wearable health monitoring, smart drug delivery, and tissue ...
Li Zhang, Yurou Yuan, Xiaohong Ding, Wing Cheung Mak   +3 more
wiley   +1 more source

A Tightly Coupled Ultra-Wideband Antenna Array With Wide-Angle Scanning Capability Based on a Novel Interdigital Structure

International Journal of Antennas and Propagation
To address the urgent demands of modern electronic countermeasure systems for antennas with ultra-wideband performance, high gain, and wide-angle scanning capability, this paper proposes a novel dual-polarized wideband antenna structure.
Qingchao Guo, Da Ran, Ying Yuan, Leisong Wang, Shuqi Jing, Liming Xu, Tianliang Zhang   +6 more
doaj   +1 more source

High‐Power Terahertz Emission from Picosecond Nano‐Plasma Switching Driven by Secondary Electron Emission Avalanche

Advanced Science, EarlyView.
A nano‐plasma device enables watt‐level on‐chip THz generation through picosecond switching triggered by secondary electron emission avalanche. An ultra‐dense electron sheet initiates nano‐plasma formation within a ∼100 nm gap, driving rapid energy release into an integrated resonator.
Guangyu Sun, Mohammad Rezaei, Yuheng Hu, Guan‐Jun Zhang, Elison Matioli   +4 more
wiley   +1 more source

Channel Uncertainty in Ultra Wideband Communication Systems

, 2005
Wide band systems operating over multipath channels may spread their power over bandwidth if they use duty cycle. Channel uncertainty limits the achievable data rates of power constrained wide band systems; Duty cycle transmission reduces the channel ...
Nacu, Serban, Porrat, Dana, Tse, David N. C.   +2 more
core   +3 more sources

Helical Electron Beam Micro‐Bunching by High‐Order Modes in a Micro‐Plasma Waveguide

Advanced Science, EarlyView.
ABSTRACT Electron acceleration by a high‐power Laguerre‐Gaussian pulse in a micro‐plasma waveguide is investigated. When the incident laser travels in the waveguide, electrons on the wall are extracted into the vacuum core and accelerated by the longitudinal field of the waveguide mode.
Xingju Guo, Longqing Yi
wiley   +1 more source