Results 11 to 20 of about 44,232 (238)

Cerebrovascular regulation dynamics and Alzheimer's neuroimaging phenotypes. [PDF]

Alzheimers Dement
Abstract INTRODUCTION Cerebrovascular dysfunction may contribute to Alzheimer's disease (AD) pathogenesis. We examined how novel cerebral hemodynamic markers relate to neuroimaging phenotypes associated with AD dementia in cognitively impaired and unimpaired older adults.
Tsiknia AA, Terner JA, Tsokolas ZE, Shin DC, Joe EB, Conti PS, Lepping RJ, Kelley BJ, Zhang R, Billinger SA, Chui HC, Marmarelis VZ, Braskie MN.   +12 more
europepmc   +2 more sources

Identifying early changes in imaging, plasma, and digital cognitive biomarkers that correspond to Alzheimer's disease pathology in the presence of autopsy-confirmed co-pathologies. [PDF]

Alzheimers Dement
Abstract INTRODUCTION Alzheimer's disease (AD) biomarkers are assessed on their ability to detect AD pathophysiology in vivo, with confirmation of AD neuropathology only at autopsy. METHODS Positron emission tomography (PET), plasma, and cognitive AD biomarkers were compared to AD neuropathology in Harvard Aging Brain Study participants (10 cognitively
Chen CD, Aguero C, Melloni A, Healy BC, Thibault EG, Fu JF, Farrell ME, Schultz S, Yang HS, Bellier JP, Chhatwal J, Webb PK, Arnold S, Penney D, Davis R, Rentz D, Gomez-Isla T, Sperling RA, Johnson KA, Price JC.   +19 more
europepmc   +2 more sources

Attenuation of Zero Sequence Voltage Using a Conventional Three-Wire Dynamic Voltage Restorer

Energies, 2021
Voltage sags/swells and harmonics are recurring problems in electric energy distribution systems. In order to solve these issues, several dynamic voltage restorer (DVR) topologies, such as the conventional three-wire DVR, have been proposed in the ...
Rafael Neto, Yandi Landera, Francisco Neves, Helber de Souza, Marcelo Cavalcanti, Gustavo Azevedo   +5 more
doaj   +1 more source

Improved dynamic voltage restorer with reduced capacity of power inverter and energy storage for voltage sag mitigation

IET Power Electronics, 2021
As one of the most representative series active compensators, dynamic voltage restorer (DVR) can solve voltage‐related power quality uses effectively. The in‐phase voltage control and energy‐optimised control are the two typical control strategies of DVR.
Qi Guo, Chunming Tu, Fei Jiang, Rongwu Zhu, Fan Xiao, Cheng Chen   +5 more
doaj   +1 more source

Effect of Direct Vertebral Rotation on the Uninstrumented Lumbar Curve in Thoracic Adolescent Idiopathic Scoliosis [PDF]

Asian Spine Journal, 2017
Study DesignRetrospective study.PurposeTo determine the effect and direction of direct vertebral rotation (DVR) in the lowest instrumented vertebra (LIV) on the uninstrumented lumbar curve depending on the lumbar modifier used for the correction of ...
Sung-Soo Kim, Jung-Hoon Kim, Se-Il Suk
doaj   +1 more source

Safe Operation Area of Energy-Storage-Free Dynamic Voltage Restorer

Zhongguo dianli, 2022
Energy-storage-free dynamic voltage restorer (DVR) is a common device used to solve voltage sag problems in engineering, but its actual operation is limited by the parameters of application scenarios.
Mingxing ZHU, Xuan LU, Huaying ZHANG, Qing WANG   +3 more
doaj   +1 more source

A Novel Solar Photovoltaic Fed TransZSI-DVR for Power Quality Improvement of Grid-Connected PV Systems

IEEE Access, 2021
In this article, a new solar PV fed Dynamic Voltage Restorer (DVR) based on Trans-Z-source Inverter (TransZSI) is proposed to improve the power quality of on-grid Photovoltaic (PV) systems.
Ali Moghassemi, Sanjeevikumar Padmanaban, Vigna K. Ramachandaramurthy, Massimo Mitolo, Mohamed Benbouzid   +4 more
doaj   +1 more source

Aortic root enlargement in patients undergoing mitral and aortic replacement: early outcomes in a sub-Saharan population

Frontiers in Cardiovascular Medicine, 2023
IntroductionAortic root enlargement (ARE) is often required to avoid patient–prosthesis mismatch (PPM) in young patients undergoing aortic surgery, including those undergoing combined mitral and aortic valve replacement (double valve replacement, DVR ...
Charles Mve Mvondo, Charles Mve Mvondo, Charles Mve Mvondo, Carole Tchokouani Djientcheu, Laurence Carole Ngo Yon, Laurence Carole Ngo Yon, Douglas Nkomo Banga, Richard Mbele, Amos Bella Ela, Alessandro Giamberti, Alessandro Frigiola, Alain Patrick Menanga, Vincent De Paul Djientcheu, Vincent De Paul Djientcheu, Marcelin Ngowe Ngowe   +14 more
doaj   +1 more source

Power quality improvement in distribution system based on dynamic voltage restorer using PI tuned fuzzy logic controller

Electrical engineering & Electromechanics, 2022
Purpose. This article proposes a new control strategy for Dynamic Voltage Restorer (DVR) in utility grid for distribution system. The proposed DVR using PI tuned fuzzy logic scheme is based on replacement of conventional DVR and voltage sag compensation ...
S. Gopal Reddy, S. Ganapathy, M. Manikandan   +2 more
doaj   +1 more source

Compensation of Distribution System Voltage using DVR [PDF]

, 2002
A dynamic voltage restorer (DVR) is a power-electronic controller that can protect sensitive loads from disturbances in the supply system. In this paper, it is demonstrated that this device can tightly regulate the voltage at the load terminal against ...
Ghosh, Arindam, Ledwich, Gerard
core   +2 more sources