Results 191 to 200 of about 733,401 (250)
New Phytologist, EarlyView.Proprioception controls trunk straightness in trees through opposite tension wood formation. A spherical growth chamber (a), combined with a two‐dimensional rotating clinostat (b2), suppresses gravi‐ and phototropic sensing. The tree is first tilted horizontally (b1), triggering upward gravitropic bending, actuated by tension wood formation on the ...
Alexandre Caulus +7 more
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Navigating Digital Transformation? The Guiding Role and Socialization Processes of Change Agents
Public Administration, EarlyView.ABSTRACT This article investigates the role of internal change agents in advancing digital transformation within public sector organizations. In response to the complexities of digitalization, these change agents guide their peers in adopting technology and bridging the gap between strategy and implementation. We draw on an 18‐month diary study (N = 68,
Caroline Fischer, Jessica Breaugh
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Plant, Cell &Environment, EarlyView.ABSTRACT Cytokinins (CKs), classically recognised as plant growth regulators, are increasingly implicated in plant‐microbe interactions. Studies in herbaceous plants suggest that CKs can function as signalling molecules with dual roles in plant defence, either restricting or facilitating pathogen infection.
Chhana Ullah +5 more
wiley +1 more source
30 years of enamel matrix derivative: Mimicking tooth development as a clinical concept
Periodontology 2000, EarlyView.Abstract The use of growth factors (GFs) has become a cornerstone of modern regenerative periodontology. While the extent to which GFs enhance tissue regeneration compared to other biomaterials was initially uncertain, it is now well established that GFs play a critical role in the regeneration of various tissue types.
Richard J. Miron +7 more
wiley +1 more source
A Study on Voltage Sag Compensating Devices Considering with Voltage Sag Characteristics in Power Systemsopenaire +1 more source
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Impact of Voltage Sags on Electric-Vehicle Charger and Critical Voltage Sag Determination
IEEE Transactions on Power Delivery, 2016This letter investigates the impact of voltage sags on electric-vehicle chargers and presents a method to determine the minimum symmetrical voltage sag during and after which chargers can both be kept stable. The proposed method is based on the constraints of pulse-width modulation (PWM), electric circuits, and small-signal stability.
Xiaoyu Wang, Xiaoqiang Guo
exaly +2 more sources
Before and during voltage sags
IEEE Industry Applications Magazine, 2005 The relationship between the voltages and the tripping level for line-operated synchronous machines is discussed. Voltage sags may cause tripping and large torque peaks in electrical machines. Tripping is caused by undervoltage protection or overcurrent protection.
Carlsson, Fredrik,
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Improved Premium Model of Voltage Sag Insurance Based on Voltage Sag Risk
IEEE Transactions on Power Delivery, 2022Voltage sag insurance (VSI) is an effective measure to reduce the voltage sag loss and risk for enterprises with insufficient mitigation confidence or economic ability. However, due to the lack of understanding of voltage sag risk (VSR), it is difficult for power utilities to identify the enterprises with VSI demands, and it is also unable to realize ...
Yun-Zhu Chen +5 more
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Voltage sags and their characterization
2010 International Conference on Power, Control and Embedded Systems, 2010Voltage sags are short duration reductions in rms voltage caused by short circuits, overloads and starting of large motors. Voltage sag is much more of a global problem. For proper analysis and mitigation of voltage sag, their characterization is important. The magnitude and durations are main characteristics of voltage sag.
Surya Prakash Singh, R. K. Tripathi
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Load modeling for voltage sag studies
2003 IEEE Power Engineering Society General Meeting (IEEE Cat. No.03CH37491), 2004This paper investigates the influence of load modeling on voltage sag characteristics and compares the results of voltage sag calculation with different load models. It is shown that some voltage sag characteristics are strongly influenced by the models chosen for representing power system loads.
Martinez, Juan A. +2 more
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