Results 41 to 50 of about 27,401 (218)

Electrolyte Design and Optimization for Alkali Metal‐Sulfur Batteries

Advanced Energy Materials, Volume 15, Issue 40, October 28, 2025.
Alkali metal sulfur‐based batteries, such as Li‐S, Na‐S, and K‐S batteries, are emerging as promising energy storage solutions due to their low cost and high energy density. However, comprehensive studies on the electrolytes used in in these batteries and their impact on electrochemical performance remain limited. This review summarizes recent advances
Min‐Hao Pai, Arumugam Manthiram
wiley   +1 more source

A Multistage Decision-Feedback Receiver Design for LTE Uplink in Mobile Time-Variant Environments

International Journal of Antennas and Propagation, 2012
Single-carrier-frequency division multiple access (SC-FDMA) has recently become the preferred uplink transmission scheme in long-term evolution (LTE) systems.
Juinn-Horng Deng, Shu-Min Liao
doaj   +1 more source

Multi-User CFOs Estimation for SC-FDMA System Over Frequency Selective Fading Channels

IEEE Access, 2018
Frequency synchronization in single-carrier frequency division multiple access (SC-FDMA) uplink system is a challenging task due to the presence of different carrier frequency offsets (CFOs) for different users.
Sushant Kumar, Sudhan Majhi, Chau Yuen
doaj   +1 more source

Electrolyte Development for Enhancing Sub‐Zero Temperature Performance of Secondary Batteries

Small, Volume 21, Issue 35, September 4, 2025.
Sub‐zero temperatures severely impact rechargeable battery performance due to electrolyte limitations like sluggish ion diffusion and interface instability. This review examines ion conduction in various electrolytes, analyzes failure mechanisms, and explores recent advancements for low‐temperature operation.
Tapabrata Dam, An‐Giang Nguyen, Guozhong Cao, Chan‐Jin Park   +3 more
wiley   +1 more source

Energy‐Aware Protocol Design and Evaluation of the PHY Layer in Satellite IoT

International Journal of Satellite Communications and Networking, Volume 43, Issue 2, Page 61-76, March/April 2025.
ABSTRACT Direct‐to‐satellite communication for the Internet of Things (IoT) has attracted significant interest from both the scientific community and major telecommunications players. The integration of satellite connectivity in smartphones and IoT devices promises a transformative impact on critical applications such as environmental monitoring, asset
Simon Heine, Christian A. Hofmann, Andreas Knopp   +2 more
wiley   +1 more source

Multiple Access Trade Study [PDF]

, 1990
The Personal Access Satellite System (PASS) strawman design uses a hybrid Time Division Multiple Access (TDMA)/Frequency Division Multiple Access (FDMA) implementation.
Motamedi, Masoud
core   +1 more source

Impact of Ionospheric Scintillations on GNSS Availability and Precise Positioning

Space Weather, Volume 23, Issue 2, February 2025.
Abstract For many applications where accuracy, availability, and integrity are essential, such as geodetic positioning and civil aviation, Global Navigation Satellite Systems (GNSS) are indispensable. However, GNSS signal dependability is severely hampered by ionospheric disturbances, especially equatorial plasma bubbles (EPBs), particularly in ...
C. R. Aguiar, J. F. G. Monico, A. O. Moraes   +2 more
wiley   +1 more source

Difficult‐to‐transport cases and neurological outcomes of out‐of‐hospital cardiac arrest: A population‐based nationwide study in Japan

Acute Medicine &Surgery, Volume 12, Issue 1, January/December 2025.
A higher proportion of difficult‐to‐transport cases was associated with poorer neurological outcomes and longer transport times in patients with OHCA. Abstract Aim In Japan, emergency medical service personnel often have difficulty obtaining hospitals' acceptance of emergency cases owing to congestion in the emergency unit; such cases are called ...
Azusa Taguchi, Shotaro Aso, Hiroshi Yamagami, Hideo Yasunaga   +3 more
wiley   +1 more source

Partially Overlapping NOMA System with Many Neighboring Channels

Journal of Communications Software and Systems
The increasing usage of the Internet of Things (IoT) and other modern massive machine-type communication applications has led to a growing demand for more efficient u tilization o f a vailable c ommunication bandwidth.
Zoltán Belso, László Pap
doaj   +1 more source

Enhancing System Capacity Through Joint Space‐Ground Multi‐Beam Coordination for LEO Satellite Systems

Engineering Reports, Volume 7, Issue 1, January 2025.
ABSTRACT Due to the long transmission distance of the constellation network represented by the low‐orbit satellite system, the satellite‐to‐ground link is subject to large path loss and limited communication performance. This paper uses multi‐satellite and multi‐beam joint transmission technology to form a virtual multiplex network with ground multi ...
Yuyang Liu, Tong Shi, Hua Wang
wiley   +1 more source