Results 171 to 180 of about 3,785,220 (369)

Surveillance and Intervention of Infrastructure-Free Mobile Communications: A New Wireless Security Paradigm [PDF]

arXiv, 2016
Conventional wireless security assumes wireless communications are rightful and aims to protect them against malicious eavesdropping and jamming attacks. However, emerging infrastructure-free mobile communication networks are likely to be illegally used (e.g., by criminals or terrorists) but difficult to be monitored, thus imposing new challenges on ...
arxiv  

The Rise of Refractory Transition‐Metal Nitride Films for Advanced Electronics and Plasmonics

Advanced Materials Interfaces, EarlyView.
Transition‐metal nitrides (TMNs) are exceptional materials with high stability, biocompatibility, and semiconductor integration, which have been extensively employed in various fields. However, the epitaxial growth of TMN films remains a challenge. The absence of high‐quality TMNs limits the understanding of their condensed matter physics and hinders ...
Jiachang Bi, Ruyi Zhang, Xiong Yao, Yanwei Cao   +3 more
wiley   +1 more source

Orbital-Angular-Momentum Versus MIMO: Orthogonality, Degree of Freedom,and Capacity [PDF]

arXiv
The plane wave based wireless communications have becoming more and more matured, along with the well utilization of the traditional resources such as time and frequency. To further increase the capacity for rapidly increasing capacity demand of wireless communications, it is potential to use the twist wave, which has the orbital angular momentum (OAM).
arxiv  

Single‐Step Fabrication of a 3D Stretchable Inductor with Multi‐jet Modeling Printing Technology

Advanced Materials Technologies, EarlyView.
This paper presents a single‐step process using multi‐jet modeling 3D printing to fabricate hybrid polymeric matrices for stretchable 3D inductors. The technology of printing both rigid and stretchable materials in a single process reduces the fabrication steps, while the novel design of the access channels ensures uniform coil channel dimensions ...
Jung‐Bin Ahn, Byungseok Yoo, Darryll J. Pines, Nathan Lazarus, David Bowen, Soaram Kim   +5 more
wiley   +1 more source

Reconfigurable Manipulation of Sound with a Multimaterial 3D Printed Origami Metasurface

Advanced Materials Technologies, EarlyView.
This paper demonstrates a programmable origami‐inspired metasurface, using multimaterial three‐dimensional printing technology to achieve reconfigurable sound manipulation. The unique bistable design enables rapid switching between configurations, allowing for precise control of acoustic reflections with minimal mechanical input. The results showcase a
Dinh Hai Le, Felix Kronowetter, Yan Kei Chiang, Marcus Maeder, Steffen Marburg, David A. Powell   +5 more
wiley   +1 more source

Biological and Mechanical Limitations for Chronic Fast‐Scan Cyclic Voltammetry Sensor Design

Advanced Materials Technologies, EarlyView.
Real‐time detection of neurochemicals has demonstrated value in the field of neuroscience. However, current methods have limitations for use in the chronic setting, which is often the ideal environment for research. This article discusses these limitations, as well as technologies that have been developed to overcome them, and provides recommendations ...
Mason L. Perillo, Bhavna Gupta, Akash Saxena, Alexandra P. Veltri, Wen Li, James R. Siegenthaler, Erin K. Purcell   +6 more
wiley   +1 more source

Wireless and Self‐Powered Wearable Pressure Sensors Based on Chitosan for Artificial Mechanoreceptors

Advanced Materials Technologies, EarlyView.
A novel self‐powered wearable pressure sensor is fabricated using chitosan‐ZnO composite piezoelectric film, achieving sensitivities of 70.71 mV/kPa and 471.43 mV Hz−1. This lightweight and biodegradable device emulates mechanoreceptors for applications such as object classification, wireless data transmission, and gesture recognition, offering an eco ...
Zhao Wang, Bhavani Prasad Yalagala, Jungang Zhang, Mahshid Hafezi, Hadi Heidari, Andrew Feeney   +5 more
wiley   +1 more source

Fully Passive Electrochemical Oxygen Sensor Enabled With Organic Electrochemical Transistor

Advanced Materials Technologies, EarlyView.
A wireless oxygen sensor that operates with low power without batteries, using organic electrochemical transistors (OECTs) powered by near‐field communication (NFC) is presented. The sensor combines an oxygen‐permeable membrane and a gel electrolyte to detect oxygen in air and complex liquids, making way for sustainable sensor technologies.
Lia Giulia D'Amico, Chenhong Zhang, Francesco Decataldo, Vito Vurro, Marta Tessarolo, Isacco Gualandi, Federica Mariani, Erika Scavetta, Tobias Cramer, Beatrice Fraboni   +9 more
wiley   +1 more source

A Bistable Assistive Device for Wireless Control of a Dysfunctional Bladder Under Minimal Stress

Advanced Materials Technologies, EarlyView.
This paper presents a wireless system designed to restore bladder function in patients with an underactive bladder (UAB). The system features a multilayered structure, combining a pre‐shaped restoration layer with a spring‐based actuator. The system delivers 95–100% voiding efficiency within a 10‐s activation while ensuring minimal stress on the ...
Shujun Xiao, Kieran Holmes‐Martin, Lichang Zhu, Alberto Pirrera, Faezeh Arab Hassani   +4 more
wiley   +1 more source

Comparative Test of Novel Fluorescent Optical Antennas for LED‐ and Laser‐Based Optical Wireless Communications

Advanced Optical Materials, EarlyView.
New fluorescent optical antennas are realized and tested for diverse Optical Wireless Communication (OWC) applications. The fluorescent concentrator slabs, based on different organic fluorophores, convert and convey the digital data conveyed through intensity modulation of incoming light toward a small‐area photodiode.
Marco Meucci, Mauro Aresti, Giulio Cossu, Lorenzo Gilli, Luca Oliviero, Matteo Bartolini, Andrea Pucci, Ernesto Ciaramella, Jacopo Catani   +8 more
wiley   +1 more source