Results 81 to 90 of about 3,140,596 (304)

MTDC systems for frequency support base on DC voltage manipulation [PDF]

, 2015
This paper presents control strategies for multi-terminal HVDC systems to provide primary frequency support to connected AC networks via coordinated DC voltage manipulation.
Rafferty, J., Wang, Y., Xu, G., Xu, L.
core   +1 more source

A Comparative Study of Cerebral Oxygenation During Exercise in Hemodialysis and Peritoneal Dialysis Patients

Therapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Introduction Cognitive impairment and exercise intolerance are common in dialysis patients. Cerebral perfusion and oxygenation play a major role in both cognitive function and exercise execution; HD session per se aggravates cerebral ischemia in this population. This study aimed to compare cerebral oxygenation and perfusion at rest and in mild
Marieta P. Theodorakopoulou, Konstantina Dipla, Danai Faitatzidou, Fotini Iatridi, Areti Georgiou, Artemios Karagiannidis, Erasmia Sampani, Chrysostomos Dimitriadis, Aggelos Koutlas, Andreas Zafeiridis, Pantelis Sarafidis   +10 more
wiley   +1 more source

Modified p-modes in penumbral filaments?

, 2007
Aims: The primary objective of this study is to search for and identify wave modes within a sunspot penumbra. Methods: Infrared spectropolarimetric time series data are inverted using a model comprising two atmospheric components in each spatial pixel.
A. Lagg, Anstee, Bel, Bogdan, Borrero, Borrero, Borrero, Borrero, Borrero, Cally, Collados, D. S. Bloomfield, Frutiger, Grossmann-Doerth, J. M. Borrero, Kentischer, Khomenko, Krijger, Müller, Nadeau, Nave, P. S. Cally, Ploner, Ploner, Rosenthal, Rueedi, S. K. Solanki, Schlichenmaier, Schunker, Solanki, Solanki, Solanki, Spruit, Title, Webb   +34 more
core   +1 more source

Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM

FEBS Letters, EarlyView.
Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley   +1 more source

A unified framework for co-optimization of PFR and FFR reserves using linearized tri-criteria frequency constraints

International Journal of Electrical Power & Energy Systems
The increasing penetration of inverter-based resources reduces system inertia and heightens concerns about frequency stability. This paper proposes a systematic methodology for jointly optimizing primary frequency response (PFR) and fast frequency ...
Jongin Kim, Jae Woong Shim, Hunyoung Shin   +2 more
doaj   +1 more source

Application of the method of multiple scales for nonlinear vibration analysis of mechanical systems with dry and lubricated clearance joints [PDF]

Journal of Theoretical and Applied Vibration and Acoustics, 2017
In this study, the method of multiple scales is used to perform a nonlinear vibration analysis of a mechanical system in two cases; with dry and lubricated clearance joints.
Saeed Ebrahimi, Esmaeil Salahshoor, Mohsen Maasoomi   +2 more
doaj   +1 more source

Enteropathogenic E. coli shows delayed attachment and host response in human jejunum organoid‐derived monolayers compared to HeLa cells

FEBS Letters, EarlyView.
Enteropathogenic E. coli (EPEC) infects the human intestinal epithelium, resulting in severe illness and diarrhoea. In this study, we compared the infection of cancer‐derived cell lines with human organoid‐derived models of the small intestine. We observed a delayed in attachment, inflammation and cell death on primary cells, indicating that host ...
Mastura Neyazi, Pilar Samperio Ventayol, Natalie Burkard, Nicolas Schlegel, Carmen Aguilar, Sina Bartfeld   +5 more
wiley   +1 more source

New frequency stability assessment based on contribution rates of wind power plants

International Journal of Electrical Power & Energy Systems
In future power systems, various generation units are expected to contribute to frequency stability. Depending on their characteristics, these units will support the frequency stability in diverse ways.
SungHoon Lim, KangWon Seo, Jung-Wook Park, Kwang Y. Lee   +3 more
doaj   +1 more source

Characterization of a Fast Battery Energy Storage System for Primary Frequency Response

Energies, 2018
In response to increasing integration of renewable energy sources on electric grid systems, battery energy storage systems (BESSs) are being deployed world-wide to provide grid services, including fast frequency regulation.
Karl Stein, Moe Tun, Marc Matsuura, Richard Rocheleau   +3 more
doaj   +1 more source

Fast frequency response of inverter-based resources and its impact on system frequency characteristics

Global Energy Interconnection, 2020
The inertia response and primary frequency regulation capability of synchronous grids are declining owing to the increasing penetration of inverter-based resources.
Lining Su, Xiaohui Qin, Shang Zhang, Yantao Zhang, Yilang Jiang, Yi Han   +5 more
doaj   +1 more source