Results 71 to 80 of about 873,936 (270)

The Acoustic System of the Fendouzhe HOV

Sensors, 2021
Due to the strong absorption and attenuation of electromagnetic waves by water, radio communications and global positioning systems are lacking in the deep-sea environment.
Yeyao Liu, Jingfeng Xue, Bo Yang, Min Zhu, Weizhen Guo, Feng Pan, Cong Ye, Wei Wang, Tao Liang, Xinguo Li, Linyuan Zhang   +10 more
doaj   +1 more source

Radiative Cooling by Green(er) Solvents‐Upcycled Polyvinyl Chloride From Drug Blisters Waste

Advanced Optical Materials, EarlyView.
This study explores upcycling poly(vinyl chloride) (PVC) from used pharmaceutical blisters into sustainable radiative cooling materials. Using solvent separation and membrane fabrication, PVC was converted into white membranes paired with aluminum foil.
Andrea Lanfranchi, Paola Lova, Davide Comoretto   +2 more
wiley   +1 more source

On Channel Codes for Short Underwater Messages

Information, 2020
Acoustic underwater communication is a challenging task. For a reliable transmission, not only good channel estimation and equalization, but also strong error correcting codes are needed.
Melanie Falk, Gerhard Bauch, Ivor Nissen
doaj   +1 more source

Improving the Robustness of Visual Teach‐and‐Repeat Navigation Using Drift Error Correction and Event‐Based Vision for Low‐Light Environments

Advanced Robotics Research, EarlyView.
Visual teach‐and‐repeat (VTR) navigation allows robots to learn and follow routes without building a full metric map. We show that navigation accuracy for VTR can be improved by integrating a topological map with error‐drift correction based on stereo vision.
Fuhai Ling, Ze Huang, Tony J. Prescott
wiley   +1 more source

Blue Laser Underwater Optical Visible Light Communication Using Recursive OFDM

Wasit Journal of Engineering Sciences
Water covers more than 75% of the earth's surface in the form of the ocean. The ocean investigation is far-fetched because the underwater environment has distinct phenomenal activities.
Sameer Hassan, Yusor Al-Mayouf, Omar Mahdi, Wisam Abd Shukur, Marcel Ambroze   +4 more
doaj   +1 more source

A Novel Fractional Fourier Transform-Based ASK-OFDM System for Underwater Acoustic Communications

Applied Sciences, 2017
A key research area in wireless transmission is underwater communications. It has a vital role in applications such as underwater sensor networks (UWSNs) and disaster detection.
Rami Ashri, Heba Shaban, Mohamad Abou El-Nasr   +2 more
doaj   +1 more source

Gb/s Underwater Wireless Optical Communications Using Series-Connected GaN Micro-LED Arrays

IEEE Photonics Journal, 2020
High speed wireless communications are highly desirable for many industrial and scientific underwater applications. Acoustic communications suffer from high latency and limited data rates, while Radio Frequency communications are severely limited by ...
Georgios N. Arvanitakis, Rui Bian, Jonathan J. D. McKendry, Chen Cheng, Enyuan Xie, Xiangyu He, Gang Yang, Mohamed S. Islim, Ardimas A. Purwita, Erdan Gu, Harald Haas, Martin D. Dawson   +11 more
doaj   +1 more source

Edible Pouch Motors

Advanced Robotics Research, EarlyView.
Edible robotics is an emerging field that leverages edible materials to construct robotic systems. This study presents a method to create thin, lightweight, yet powerful edible soft actuators, namely edible pouch motors. The successful operation of these edible actuators and grippers renders their potential to advance future developments in edible ...
Keigo Takahashi, Kazuma Takai, Ryuma Niiyama, Jun Shintake   +3 more
wiley   +1 more source

The JANUS underwater communications standard

2014 Underwater Communications and Networking (UComms), 2014
There are currently no digital underwater communications standards. In this paper we describe JANUS, a simple multiple-access acoustic protocol designed and tested by the NATO Centre for Maritime Research and Experimentation (CMRE) over the past 6 years that provides a basic and robust tool for collaborative underwater communications.
Potter, J., Alves, J., Green, D., Zappa, G., Nissen, I., McCoy, K.   +5 more
openaire   +2 more sources

Waveguide Photoactuators: Materials, Fabrication, and Applications

Advanced Robotics Research, EarlyView.
Waveguide photoactuators convert guided light into mechanical motion. Their tethered‐flexible design enables minimally invasive surgery and confined‐space robotics. This review aims to guide materials selection, device design, and system integration, accelerating the transition of waveguide photoactuators from laboratory prototypes to versatile ...
Minjie Xi, Hemin Pan, Yang Zong, Yongfeng Mei, Jizhai Cui   +4 more
wiley   +1 more source