Results 51 to 60 of about 2,083,913 (216)

Technology Transfer to Underwater Archaeology: The LAHKE Project at the Submerged Neolithic Site of La Marmotta

Archaeological Prospection, EarlyView.
ABSTRACT This document is a report on the field application of non‐invasive geophysical and robotic prospecting methods at the submerged Neolithic site of La Marmotta (Lake Bracciano, Italy), within the LAHKE (LAke Heritage Knowledge and Exploration) project; the study focuses on the practical validation, adaptation and transfer of existing ...
dell' Erba Ramiro, Cupertino Giacomo, Cipollini Angelo, Luciano Blasi, Quattrucci Luca   +4 more
wiley   +1 more source

A New Approach to Spread-spectrum OFDM

, 2018
Orthogonal frequency division multiplexing (OFDM) systems are reviewed and the Shannon bound is dis- cussed as a criterion of efficient spectrum use and a design criterion. The problem of efficient sharing of spectrum by wireless communication systems is
Shahab Abdulla, Ronald G. Addie, Mohammad Kaisb Layous Alhasnawi, Abdulla, Shahab, Alhasnawi, Mohammad Kaisb Layous, Addie, Ronald G.   +5 more
core   +1 more source

Embedding a Dinuclear Ru─Pt Photocatalyst Into Polyampholytic Graft Copolymer Matrix Enables Prolonged Hydrogen Evolution While Allowing Catalyst Repair

Chemistry – A European Journal, EarlyView.
A unimolecular polyampholytic graft copolymer matrix provides a protective confinement for an electrostatically embedded tetrapyridophenazine‐bridged heterodinuclear Ru‐Pt hydrogen evolving photocatalyst. The matrix slows the degradation kinetics of the catalyst and at the same time does not hinder its repair by ammonium persulfate.
Yurii Utievskyi, Alexander K. Mengele, Mariet Puthanagady, Nikita Vashistha, Linda Zedler, Christof Neumann, Marius Müßler, Andrey Turchanin, Benjamin Dietzek‐Ivanšić, Sven Rau, Felix H. Schacher   +10 more
wiley   +1 more source

Novel Double Slope Frequency Shift Chirp Symbol

IEEE Access
One of the most significant concerns in serial digital communication is the synchronization of data bits between the transmitter and receiver. Therefore, the preferred coding symbols should contain an inherited clock signal. The cyclic-shift chirp, which
Lerson Kirasamuthranon, Paramote Wardkein, Jeerasuda Koseeyaporn   +2 more
doaj   +1 more source

LoRa and Rotating Polarization Wave: Physical Layer Principles and Performance Evaluation

IEEE Access, 2023
Link reliability and enhanced coverage are the primitive concerns of Low-Power Wide-Area Networks (LPWANs) for suitability to critical Internet of Things (IoT) applications.
Zaid Ahmad, Shaiful J. Hashim, Guillaume Ferre, Fakhrul Z. Rokhani, S. A. R. Al-Haddad, Aduwati Sali   +5 more
doaj   +1 more source

A Co‐Designed Implicit‐Reset Path PFD and Current Mismatch Compensated CP Enabling Sub‐0.5% Mismatch and Dead Zone‐Free for Low‐Spur PLLs

International Journal of Circuit Theory and Applications, EarlyView.
A co‐designed implicit‐reset phase‐frequency detector (PFD) and nonlinear amplifier‐assisted charge pump (CP) achieve dead zone‐free operation from 10 MHz to 4.7 GHz with < 0.5% current mismatch without calibration, enabling −80 dBc of reference spur and 0.50 ps of RMS jitter in a 180 nm of CMOS PLL.
A. Ghaemnia, Jincheng Yang, Xiaojiong Fei, G. Zhang   +3 more
wiley   +1 more source

Success Probability Characterization of Long-Range in Low-Power Wide Area Networks

Sensors, 2020
In low-power wide area networks (LPWAN), a considerable number of end devices (EDs) communicate with the gateway in a certain area, whereas for transmitted data, a low data rate and high latency are allowed.
Yi-Kang Kim, Seung-Yeon Kim
doaj   +1 more source

High‐Voltage Stability of LiCoO2 Cathode Materials Composited With Vanadium‐Based Glass Coatings

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
Vanadium‐based glasses show fluidity and good wettability toward other materials at low temperatures. The controlled precipitation of nanocrystals in vanadium‐based glasses enhances the material's mechanical properties and electrical conductivity. The VPFL coatings bond to the LiCoO2 interface via chemical bonds.
Xu Wang, Zhiquan Su, Weiwen Chen, Qiang Chen, Yihong Chen, Fanhou Kong, Zhe Wang, Yao Zhou, Xiaolong Yu, Changjiu Li   +9 more
wiley   +1 more source

A sub-μs accuracy GPS alternative using electrical transmission grids as precision timing networks

Scientific Reports
It is widely recognised that over-reliance on GNSS (e.g GPS) for time synchronisation represents an acute threat to modern society, and a diversity of alternatives are required to mitigate the threat of an outage.
Stephen Robson, Manu Abderrahmane Haddad
doaj   +1 more source

Inter-Relay Interference Mitigation for Chirp-Based Two-Path Successive Relaying Protocol

Sensors, 2019
Since the chirp spread spectrum (CSS) system is considered as a communication technology for the Internet of things (IoT), long-range communication and a high data rate are required.
Kwang-Yul Kim, Yoan Shin
doaj   +1 more source