Results 71 to 80 of about 4,089 (198)

Retrieving Hourly Aerosol Absorption From Space Using Physical Informed Deep Learning

open access: yesGeophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract Retrieving aerosol absorption properties, such as single scattering albedo (SSA) and absorption aerosol optical depth (AAOD) from single‐view satellite observations remains a significant challenge. This study introduces the Physics‐Informed Neural Network for Aerosols (PINA) framework to retrieve hourly aerosol absorption properties from ...
Tao Xia   +3 more
wiley   +1 more source

Static Behaviors of Confined Time-Arrival Operators

open access: yes, 2007
We show that the quantization of the classical Time-of-Arrival (TOA) for arbitrary position X still leads to a class of self-adjoint TOA-operator for a confined particle.
Bahague Jr., R. R., Galapon, E. A.
core   +1 more source

Determining times of arrival of transponder signals in a sensor network using GPS time synchronization

open access: yes, 2022
S.481 (Volltext auf CD-ROM: 9 S.)In this paper, obtaining time of arrival (TOA) measurements in a sensor network is investigated. Differentiating these TOA measurements provides the Time Difference of Arrival (TDOA) measurements between sensor pairs.
Steffes, C., Kaune, R., Rau, S.
core  

Low‐Temperature Initiation Enhances HCN and NH3 Formation From Methane and NO Over Pt/Al2O3

open access: yesChemistry – A European Journal, Volume 32, Issue 24, 23 June 2026.
Hydrogen cyanide (HCN) was formed from CH4 and NO over Pt/Al2O3 at low temperatures. Increasing NO concentration and optimizing reaction‐start conditions significantly enhanced HCN yield. In situ FTIR and DXAFS measurements revealed that dynamically balancing Pt‑CO and Pt‑CN surface species, particularly their desorption under temperature‑swing ...
Emika Yamashita   +3 more
wiley   +1 more source

TOA Estimator for UWB Backscattering RFID System with Clutter Suppression Capability

open access: yesEURASIP Journal on Wireless Communications and Networking, 2010
Time of arrival (TOA) estimation in multipath dense environment for UWB backscattering radio frequency identification (RFID) system is challenging due to the presence of strong clutter.
Xu Chi, Law ChoiL
doaj   +2 more sources

Anthropogenic Aerosols Influence Tropical Pacific Sea Surface Temperature Gradient Trends

open access: yesGeophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract The tropical Pacific is warming more in the west than the east. This observed strengthening of the tropical Pacific east‐to‐west Sea Surface Temperature (SST) gradient is poorly reproduced in climate models—a prominent model bias with far reaching global impacts.
Penelope Maher   +4 more
wiley   +1 more source

Multi-Source Localization Using Time of Arrival Self-Clustering Method in Wireless Sensor Networks

open access: yesIEEE Access, 2019
The localization of multiple signal sources based on Time Of Arrival (TOA) measurements in wireless sensor networks is investigated in this paper. When the signal sources cannot be distinguished by their signatures or other unique characteristics, the ...
Xinwei Guo   +3 more
doaj   +1 more source

Strong Sensitivity of Simulated Biomass Burning Aerosol Transport and Radiative Effects Over the South Atlantic to Carbonaceous Aerosol Aging and Particle Density

open access: yesJournal of Geophysical Research: Atmospheres, Volume 131, Issue 11, 16 June 2026.
Abstract Biomass burning aerosol (BBA) impacts climate through aerosol‐cloud‐radiation interactions, but models disagree on the sign and magnitude of BBA radiative effects. We quantify the sensitivity of BBA radiative effects and transport to three BBA‐relevant processes and properties: parameterized oxidative aging of organic aerosol (OA), a combined ...
Kate Johnson   +9 more
wiley   +1 more source

Time of arrival based location estimation for cooperative relay networks

open access: yes, 2010
In this paper, we investigate the performance of a cooperative relay network performing location estimation through time of arrival (TOA). We derive Cramer-Rao lower bound (CRLB) for the location estimates using the relay network.
Syed I. Hussain   +9 more
core   +1 more source

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