Results 41 to 50 of about 2,352 (176)

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

Time of Arrival Based on Chirp Pulses as a means to Perform Localization in IEEE 802.15.4a Wireless Sensor Networks

Advances in Electrical and Computer Engineering, 2010
This paper introduces the technology Time of Arrival (TOA) based on chirp pulses (according to IEEE 802.15.4a) as a means to perform localization in Wireless Sensor Networks (WSN's) active at 2.4 GHz.
NAUWELAERS, B., De STRYCKER, L., GOEMAERE, J.-P., WYFFELS, J., Van NIEUWENHUYSE, A.   +4 more
doaj   +1 more source

Syrinx anatomy and vocalizations in New World vultures (Aves: Cathartidae): Implications for avian vocal evolution

Journal of Anatomy, EarlyView.
New World vultures are the only avian clade proposed to lack a syrinx and have been described as non‐vocal. Using dissection, diceCT, and histology, we demonstrate that cathartid vultures have novel syringeal features that form a syrinx and vocal characterization reveals that they produce more complex vocalizations than previously reported.
Bradley A. Ibarra, Carmen A. Urban, Lucas J. Legendre, Julia A. Clarke   +3 more
wiley   +1 more source

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

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

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

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

Sir and Guys in 20th‐ and 21st‐Century American English

World Englishes, EarlyView.
ABSTRACT This paper examines the diachronic development of formal and informal address and reference terms in American English as an effect of democratization using the COHA corpus (1900–2020). In focus are two address/reference terms with especially drastic frequency trends in the timespan investigated: the honorific sir, which declines sharply from ...
Hanna Bruns, Svenja Kranich
wiley   +1 more source

Seasonal Patterns and Environmental Drivers of Seagrass (Zostera muelleri) Flowering in Aotearoa New Zealand: Implications for Seed‐Based Restoration

New Zealand Journal of Marine and Freshwater Research, Volume 60, Issue 3, September 2026.
Seagrass flowering underpins seed‐based restoration and is governed by the interaction of multiple abiotic and biotic drivers operating across a range of temporal and spatial scales. In New Zealand/Aotearoa, flowering was historically considered rare, but emerging evidence indicates it is more widespread than previously recognised, creating new ...
Dana E. Clark, Dan Crossett, Jessica Barr, Demi Fearn, Georgia Cotter, Javier Atalah, Susie Hine, Eleanor Brettle, Irisa Hudson, Maureen Ho, Sophie Whittall, Al Alder, Halle Unsworth, Anna Berthelsen   +13 more
wiley   +1 more source