Results 101 to 110 of about 4,561,256 (335)
Advanced Science, EarlyView.Hard carbon derived from templated poly(dicyclopentadiene) as anode for sodium–ion batteries was engineered through carbonization and second‐step CO2${\rm CO}_2$ activation. High‐temperature carbonization and activation increased local ordering while reducing defects without inducing structural fracture.
David Schuster +11 more
wiley +1 more source
Extending the LoRa Direct-to-Satellite Limits: Doppler Shift Pre-Compensation
IEEE Open Journal of the Communications SocietyEarlier studies and field tests have extensively investigated Long Range (LoRa) direct-to-satellite (DtS) communications, confirming the feasibility of integration with Low Earth Orbit (LEO) satellites.
Muhammad Asad Ullah +8 more
doaj +1 more source
Advanced Science, EarlyView.A distinct astrocyte subpopulation, enriched at the lesion border, drives CNS repair through enhanced ketone body metabolism. This process promotes neuronal survival and axonal sparing via CPT1A stabilization and H3K9bhb‐dependent epigenetic reprogramming, positioning astrocytic ketogenesis as a promising therapeutic target for tissue regeneration ...
Dishui Pan +14 more
wiley +1 more source
Doppler frequency analysis for sound-field sampling with moving microphones
Frontiers in Signal ProcessingMoving microphones allow for the fast acquisition of sound-field data that encode acoustic impulse responses in time-invariant environments. Corresponding decoding algorithms use the knowledge of instantaneous microphone positions for relating the ...
Fabrice Katzberg +3 more
doaj +1 more source
Advanced Science, EarlyView.A tiny RNA tips the scales of cardiac injury in aging. piR‐4913 recruits OGT to Drp1 and drives its O‐GlcNAcylation at Thr604, promoting excessive mitochondrial fission that aggravates ischemia‐reperfusion injury. Ischemic postconditioning silences this pathway to restore mitochondrial balance and protect the aged myocardium, revealing piR‐4913 as a ...
Xiangyu Zhao +11 more
wiley +1 more source
Journal of Marine Science and EngineeringWhen an airborne sound source is in rapid motion, the acoustic signal detected by the underwater sensor experiences a substantial Doppler shift. This shift is intricately linked to the motion parameters of the sound source.
Junjie Mao +6 more
doaj +1 more source
Doppler shift experiments with source in periodic motion: Parametrized Doppler shift formulas
, 2003 Doppler shift formulas are derived for two less studied scenarios: stationary receiver and source in harmonic oscillatory motion and stationary receiver and source in uniform circular motion. For each of the scenarios we derive a formula, one which works when the emission period is small enough that it can be considered that two successive signals are ...
Rothenstein, Bernhard +1 more
openaire +2 more sources
Choosing the Right Signal: Doppler Shift Estimation for Underwater Acoustic Signals *
, 2020 In this paper, we consider the problem of estimating the coarse Doppler shift ratio for underwater acoustic communication (UWAC). Since underwater the constant motion of nodes results in Doppler shifts that significantly distort received signals ...
core
Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems
Advanced Electronic Materials, EarlyView.Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang +9 more
wiley +1 more source
A novel method of Doppler shift estimation for OFDM systems
, 2008 Doppler shift estimation has been deployed to improve the performance of Orthogonal Frequency Division Multiplexing (OFDM) systems. A novel method of Doppler shift estimation for OFDM systems in time varying and frequency selective fading channels has ...
Zhou, W, Lam, WH
core +1 more source