Results 41 to 50 of about 2,329 (164)

BASAT: BLE AOA-Based Spatio-Temporal Acoustic TOA Estimator

IEEE Access
In severely reverberant indoor environments, acoustic Time-of-Arrival (TOA) localization on commercial smartphones is prone to multipath-induced bias and unreliable ranging.
Can Xue, Huixin Zhuge, Zhi Wang
doaj   +1 more source

A novel time of arrival estimation algorithm using an energy detector receiver in MMW systems

EURASIP Journal on Advances in Signal Processing, 2017
This paper presents a new time of arrival (TOA) estimation technique using an improved energy detection (ED) receiver based on the empirical mode decomposition (EMD) in an impulse radio (IR) 60 GHz millimeter wave (MMW) system.
Xiaolin Liang, Hao Zhang, Tingting Lyu, Han Xiao, T. Aaron Gulliver   +4 more
doaj   +1 more source

Comparison of different X‐ray‐based scanning electron microscopy methods to detect sub‐nanometre ultra‐thin InAs layers deposited on top of GaAs

Journal of Microscopy, EarlyView.
Abstract We compare three different methods of X‐ray analysis in a scanning electron microscope (SEM): energy‐dispersive X‐ray spectroscopy (EDX), wavelength‐dispersive X‐ray spectroscopy (WDX) and micro X‐ray fluorescence (μXRF). These methods are all applied to the same gallium arsenide (GaAs) wafer with a 0.8 nm layer of indium arsenide (InAs) on ...
Thomas Walther, Stuart Creasey‐Gray, Stephan Boehm, Heath Young, Yang Yang   +4 more
wiley   +1 more source

A Closed-Form Localization Algorithm and GDOP Analysis for Multiple TDOAs and Single TOA Based Hybrid Positioning

Applied Sciences, 2019
Cellular communication systems support mobile phones positioning function for Enhanced-911 (E-911) location requirements, but the positioning accuracy is poor. The fifth-generation (5G) cellular communication system can use indoor distribution systems to
Zhongliang Deng, Hanhua Wang, Xinyu Zheng, Xiao Fu, Lu Yin, Shihao Tang, Fuxing Yang   +6 more
doaj   +1 more source

Determining bismuth content in GaAsBi alloys by energy‐dispersive X‐ray spectroscopy: A case study with multiple sets of k*‐factors for analytical transmission electron microscopy

Journal of Microscopy, EarlyView.
Abstract Measuring the bismuth (Bi) content of ternary gallium arsenide bismuthide (GaAsBi) alloys is important because it sensitively influences their bandgap, and Bi is known to segregate vertically to the surface and sometimes also laterally during growth, so elemental distribution maps need to be quantified.
T. Walther
wiley   +1 more source

Multi-Sensor Passive Localization Using Second Difference of Coherent Time Delays With Incomplete Measurements

IEEE Access, 2019
The passive localization using multiple sensors is considered for emitter transmitting pulse signals with unknown start transmission time and period.
Shangyu Zhang, Zhen Huang, Xuefeng Feng, Jiazhi He, Lei Shi   +4 more
doaj   +1 more source

Measurement and modeling of diffuse ultraviolet radiation: A review

Photochemistry and Photobiology, EarlyView.
Solar UV radiation consists of direct and diffuse UV components. The diffuse component contributes to the exposure received by humans and to the risk of skin cancer and sun‐related eye disorders. This review aims to determine future research directions for the measurement and modeling of diffuse solar UV radiation.
Alfio V. Parisi, Joanna Turner, Abdurazaq Amar, Damien P. Igoe, Peter Schouten, Nawin Raj, Nathan Downs, Harry Butler   +7 more
wiley   +1 more source

Design of Orthogonal Phase of Arrival Positioning Scheme Based on 5G PRS and Optimization of TOA Performance

IEEE Access
This study analyzes the performance of positioning techniques based on configuration changes of 5G New Radio (NR) signals. In 5G networks, a terminal’s position is determined from the Time of Arrival (TOA) of Positioning Reference Signals (PRS ...
Hyejin Shin, Sohee Kim, Ilmu Byun, Juyeop Kim   +3 more
doaj   +1 more source

Disaster Schooling Experiences and Emergent Crises: Lessons From Puerto Rico

Anthropology &Education Quarterly, Volume 57, Issue 3, September 2026.
ABSTRACT This paper examines the disaster schooling experiences of Puerto Rican educators, families, and students across multiple crises following Hurricane Maria. Drawing on 11 months of ethnographic research, we analyze how schooling unfolded across disasters and how long‐standing vulnerabilities and structural inequalities shaped responses. Findings
Melissa Colón, Rosalyn Negrón, Lisa Jahn   +2 more
wiley   +1 more source

Sprites Observed by ASIM: First Imaging Data Set and Temporal UV Emission Patterns

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 14, 28 July 2026.
Abstract We present the first data set analysis of 41 imaging‐confirmed sprite events detected by the ASIM‐MMIA instrument. They were visible in the 337 nm camera images from an initial list of 102 candidates identified by the ultraviolet (UV 180–230 nm) photometer.
J. A. López, J. Montanyà, O. van der Velde, D. Romero, J. Navarro‐González, V. Reglero, O. Chanrion, T. Neubert, N. Østgaard   +8 more
wiley   +1 more source