Results 71 to 80 of about 2,868,537 (226)

Angular CMA: A modified Constant Modulus Algorithm providing steering angle updates [PDF]

open access: yes, 2011
Conventional blind beamforming algorithms have no direct notion of the physical Direction of Arrival angle of an impinging signal. These blind adaptive algorithms operate by adjusting the complex steering vector in the case of changing signal conditions ...
Blom, Koen C.H.   +4 more
core   +2 more sources

Magnetoencephalographic detection of the epileptic activity localized in the hippocampus using stereotactic electroencephalography and magnetoencephalography simultaneously

open access: yesEpilepsia, Volume 66, Issue 9, Page 3453-3464, September 2025.
Abstract Objective To evaluate the ability of magnetoencephalography (MEG) to detect the activity of a deep brain structure, particularly the hippocampus, using simultaneous stereotactic electroencephalography (SEEG) and MEG recordings. Methods We included six patients with intractable temporal lobe epilepsy who underwent simultaneous SEEG and MEG.
Akitake Okamura   +7 more
wiley   +1 more source

Image Enhancement and Noise Reduction Using Modified Delay-Multiply-and-Sum Beamformer: Application to Medical Photoacoustic Imaging

open access: yes, 2018
Photoacoustic imaging (PAI) is an emerging biomedical imaging modality capable of providing both high contrast and high resolution of optical and UltraSound (US) imaging.
Mahloojifar, Ali   +2 more
core   +1 more source

Synaptic inhibitory dynamics drive benzodiazepine response in pediatric status epilepticus

open access: yesEpilepsia, Volume 66, Issue 8, Page 2980-2994, August 2025.
Abstract Objective Pediatric status epilepticus (SE) is a medical emergency associated with significant morbidity. Benzodiazepines (BZPs) are the current first‐line treatment, but do not work in more than one third of children presenting with SE. Animal studies have shown that SE can cause changes in synaptic inhibition signaling that can ultimately ...
Tommaso Fedele   +5 more
wiley   +1 more source

The SIBUS‐IN Fingerheld Ultrasound Machine

open access: yesJournal of Cosmetic Dermatology, Volume 24, Issue 7, July 2025.
ABSTRACT Background Minimally invasive esthetic procedures risk vascular occlusion, necrosis, and other sequelae; real‐time ultrasound guidance mitigates these events, yet conventional devices are bulky and two‐handed. Aim To present the SIBUS‐IN fingerheld ultrasound system and summarize its technical features and clinical advantages for esthetic ...
Jovian Wan   +7 more
wiley   +1 more source

Beamspace Aware Adaptive Channel Estimation for Single-Carrier Time-varying Massive MIMO Channels

open access: yes, 2017
In this paper, the problem of sequential beam construction and adaptive channel estimation based on reduced rank (RR) Kalman filtering for frequency-selective massive multiple-input multiple-output (MIMO) systems employing single-carrier (SC) in time ...
Ayanoglu, Ender, Guvensen, Gokhan M.
core   +1 more source

Label‐Free Dual‐Modal Photoacoustic/Ultrasound Localization Imaging for Studying Acute Kidney Injury

open access: yesAdvanced Science, Volume 12, Issue 22, June 12, 2025.
This work develops a 3D label‐free photoacoustic/super‐resolution ultrasound imaging system as a comprehensive non‐invasive tool for acute kidney injury (AKI) study. This technique visualizes the intricate structure of renal microvessels and provides critical physiological insights, including renal hemodynamics and oxygenation.
Shensheng Zhao   +5 more
wiley   +1 more source

Reconfigurable Intelligent Surfaces (RIS) and Their Role in Next‐Generation Wireless Networks: An Overview

open access: yesTransactions on Emerging Telecommunications Technologies, Volume 36, Issue 6, June 2025.
This paper explicitly reviews the state‐of‐the‐art RIS‐assisted wireless networks, especially open challenges relating to the B5G and 6G networks. This work presents an intensive study of recent research on RIS to provide an in‐depth understanding of the underlying principles surrounding RIS operations, composition, and effect on EM waves.
Chukwuemeka Nwufo   +2 more
wiley   +1 more source

Multipath and interference errors reduction in gps using antenna arrays [PDF]

open access: yes, 1996
The Global Positioning System (GPS) is a worldwide satellite based positioning system that provides any user with tridimensional position, speed and time information.
Fernández Rubio, Juan Antonio   +1 more
core  

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