Results 81 to 90 of about 623,412 (262)

PLL-Current Controller Stabilizer for Weak Grid-Connected Mixed-Domain Controlled Converters

IEEE Access
Instability issues arising from the interaction of Phase-Locked Loops (PLLs) and weak grids have become relevant research topics due to the increasing penetration of inverter-based resources in distribution systems.
Andre G. P. Alves, Cleiton M. Freitas, Oscar C. Zevallos, Lais F. Crispino, Marcello S. Neves, Luis G. B. Rolim   +5 more
doaj   +1 more source

Assessment of the pharmacological effects of alprazolam on electroencephalography using connectivity indexes not affected by volume conduction

Frontiers in Systems Neuroscience, 2015
Introduction Electroencephalographic analysis techniques have become a very useful tool to assess brain activity and interactions between cerebral regions, that is, the so-called cerebral connectivity analysis.
Joan Francesc Alonso, Joan Francesc Alonso, Joan Francesc Alonso, Jordi Riba   +3 more
doaj   +1 more source

Scaffolding a Low‐Cost Experiential Bioreactor Module: Reducing Cognitive Load to Enhance Competency and Self‐Efficacy

Biochemistry and Molecular Biology Education, EarlyView.
ABSTRACT Low‐cost experiential modules are critical for democratizing biotechnology education, yet most undergraduates lack hands‐on experience with continuous‐culture bioreactor operations, which are fundamental to industrial bioprocessing. This study employed design‐based research across two iterative cycles (Fall 2024, n = 8; Fall 2025, n = 11) to ...
Russell K. Pirlo, Matthew Lopper, Justin C. Biffinger   +2 more
wiley   +1 more source

MMC HVDC Controls for Damping Subsynchronous Interactions With LCC HVDC and Thermal Generator

International Transactions on Electrical Energy Systems
This paper develops a subsynchronous damping controller (SSDC) on modular multilevel converter (MMC) HVDC with the aim of mitigating three-way torsional interactions between a line commutated converter (LCC) HVDC, MMC HVDC and a nuclear generator.
Stefan Kovacevic, Dragan Jovcic, Pierre Rault, Olivier Despouys   +3 more
doaj   +1 more source

Switching people who smoke to unfiltered cigarettes: Effects on smoking topography

Addictive Behaviors Reports
Introduction: Smoking topography (ST) describes smoking behavior and patterns. Removal of the cigarette filter and subsequent impact on ST has not been investigated.
Devan R. Romero, Giovanni Appolon, Thomas E. Novotny, Kim Pulvers, LaRee Tracy, Nora Satybaldiyeva, Jose Magraner, Eyal Oren   +7 more
doaj   +1 more source

Diagnostic Accuracy and Feasibility of Quantitative Flow Ratio at Low Frame Rate Angiography: The Prospective Multicentre Australian AVALON Study

Catheterization and Cardiovascular Interventions, EarlyView.
ABSTRACT Background Quantitative Flow Ratio (QFR) is a well‐established, non‐hyperemic, angiographic, wire‐free predictor of ischemia when compared to Fractional Flow Reserve (FFR). However, its diagnostic accuracy at low frame rates (< 10 frames/second), commonly used in contemporary practice to minimize radiation exposure, has not been evaluated ...
Joseph M. O'Brien, Michael Zhang, Thomas J. Ford, Peter J. Psaltis, Jessica A. Marathe, Jayant Ravindran, Rajan Rehan, Vidushi Tripathi, Eleanor Redwood, Kelly Easey, Adam J. Brown, Derek P. Chew, Andy Yong, Dennis T. L. Wong   +13 more
wiley   +1 more source

The Role of Various Filters in Hypoxemia Levels of Hemodialysis Patients

Majallah-i Dānishgāh-i ’Ulūm-i Pizishkī-i Shahīd Ṣadūqī Yazd, 2008
Introduction: One of the main complications of hemodialysis in patients with chronic renal failure is hypoxemia which is related to several factors including the type of filter.
Sh Mousavi, M Malek, MR Tamadon, J Toussy, F Malek, M Ghaderi   +5 more
doaj  

On Metal Carbonyl Compounds in Catalytic Methanol Synthesis: Detection, Consequences, and Removal

Chemie Ingenieur Technik, EarlyView.
Deactivation of Cu/ZnO/Al2O3 catalysts by metal carbonyl compounds in the feed gas is a critical problem in catalytic methanol synthesis. We utilize PTR–MS to identify potential chemical sources, detect contamination in an in‐house CO gas line, and validate filter methods for removing these catalyst poisons before synthesis.
Florian Stappert, Daniel Laudenschleger, Tim Herrendorf, Julia Menten, Holger Ruland   +4 more
wiley   +1 more source

High Strength Erosion Resistant Sand Screen for Thermal Recovery Horizontal Well

Shiyou jixie, 2015
To maintain a consistent heavy oil production of thermal recovery horizontal well and extend the sand control validity period,a high strength erosion resistant sand screen for thermal recovery horizontal well has been developed considering the actual ...
Zhang Xijuan, Ma Ding, Wang Dong, Yan Jinyou, Zhang Bingyang, Zhang Yu, Chen Gang   +6 more
doaj  

Hopf bifurcation control of the Rössler system based on Washout filter controller

Acta Physica Sinica, 2011
The Washout filter is adopted to control Hopf bifurcation in Rössler system. The effect of its parameters on the position of bifurcation point, the bifurcation type, and the amplitude of periodic solution is discussed in detail. Based on Routh criterion, the stability region in parameter space is found out firstly.
null Wu Zhi-Qiang, null Sun Li-Ming
openaire   +1 more source