Results 61 to 70 of about 1,709,387 (277)
Compact Manifolds With Unbounded Nilpotent Fundamental Groups and Positive Ricci Curvature
Communications on Pure and Applied Mathematics, EarlyView.ABSTRACT It follows from the work of Kapovitch and Wilking that a closed manifold with nonnegative Ricci curvature has a uniformly almost nilpotent fundamental group. Leftover questions and conjectures, have asked if in this context the fundamental group is actually uniformly almost abelian. The main goal of this work is to construct examples (Mk9,gk)$(
Elia Bruè, Aaron Naber, Daniele Semola
wiley +1 more source
, 2016 Line commutated HVDC systems are widely used due to their high power ratings. However, one of the disadvantages of such HVDC systems is the high risk of commutation failures when AC disturbances arise.
Oketch, Innocent
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Corporate Social Responsibility and Environmental Management, EarlyView.ABSTRACT Employee sustainability teams—groups collaborating continuously and voluntarily on sustainability initiatives—can serve as a bottom‐up driver for organizational change. Despite their potential, however, their role and contributions are underexplored. To fill this gap, our multi‐case study examines 59 projects by 13 teams across three companies
Jennifer Adolph +3 more
wiley +1 more source
Studyonthe CommutationFailureinMulti-infeedHVDCSystem
工程科学与技术, 2014 :Because the accuracy of the traditional minimum voltage drop method used to commutation failure is not high enough, a new commutation failure criterion was proposed.
肖俊, 李兴源, 张英敏, 林桥
doaj
Climate‐related exposures and seizures in children: A systematic review
Epilepsia, EarlyView.Abstract Objective Climate‐related exposures, including air pollution, temperature extremes, humidity, and atmospheric conditions, are increasingly recognized as potential seizure triggers. As climate change intensifies, understanding the environmental contributors to pediatric seizure risk has important implications for anticipatory guidance and ...
Caroline Sarpy +5 more
wiley +1 more source
, 2023 Commutation failure (CF) is a major challenge associated with line-commutated converter high voltage dc (LCC-HVdc) systems. Faults at the inverter ac systems are regarded as main cause of commutation failure.
Kimia Ghaffari (10332005) +5 more
core +1 more source
The Feasibility Test of Electric Propulsion Systems: Case Study for a Light and Fixed‐Wing Aircraft
Energy Science &Engineering, EarlyView.ABSTRACT This study investigates the feasibility and performance of a fully electric propulsion system (EPS) integrated into a light fixed‐wing aircraft. The system consists of a 65 kW‐class electric motor, a high‐efficiency inverter, and dual lithium‐ion battery packs with a total capacity of 27 kWh—collectively engineered to fulfill both power ...
Byeong Gyu Gang
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Feminist Anthropology, EarlyView.Abstract This article explores how working middle‐class women in Karachi navigate the intersecting burdens of care and self‐care within the affective, infrastructural, and ideological conditions of urban precarity. Drawing on twelve semi‐structured interviews conducted across homes, workplaces, and cafés in the city, seven of which anchor the primary ...
Muhammad Huzaifa
wiley +1 more source
IEEE AccessThe HVDC transmission system with a line-commutated converter is prone to commutation failure when connected to a weak AC grid and has disadvantages such as a large footprint of AC filters and high noise from the converter transformer.
Hao Zhang +5 more
doaj +1 more source
Effect of commutation failure on the distance protection and the countermeasures
IET Generation, Transmission & Distribution, 2015 Commutation failure (CF) may be caused by AC fault in AC/DC interconnected system, and it will affect the performance of distance protection. The transient characteristic of equivalent current of power‐frequency of the dc–ac inverter is first analysed by introducing the concept of quadrant.
Shao‐feng Huang +3 more
openaire +1 more source