Results 21 to 30 of about 64,427 (263)
Tutorial: Topology, Waves, and the Refractive Index
International Journal of Theoretical Physics, 2023 AbstractThis tutorial is divided into two parts: the first examines the application of topology to problems in wave physics. The origins of the Chern number are reviewed, where it is shown that this counts the number of critical points of a complex tangent vector field on the surface.
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On the topology and index of minimal surfaces II
Journal of Differential Geometry, 2023 For an immersed minimal surface in $\mathbb{R}^3$, we show that there exists a lower bound on its Morse index that depends on the genus and number of ends, counting multiplicity. This improves, in several ways, an estimate we previously obtained bounding the genus and number of ends by the index. Our new estimate resolves several conjectures made by J.
Chodosh, Otis, Maximo, Davi
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Influence mechanism of MMC-HVDC grid topology on fault current
电力工程技术, 2022 The line fault of the modular multilevel converter based high voltage direct current (MMC-HVDC) grid seriously threatens the safe and stable operation of the power system,and the MMC-HVDC grid topology has a significant impact on the fault current.
ZHANG Yingmin +4 more
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Seven-level inverter with switched capacitors
The Journal of Engineering, 2019 The seven-level (7L) inverter with a nearly sinusoidal output voltage is suitable for renewable energy conversion applications. A novel 7L inverter topology with switched capacitors is proposed here.
Xuezhi Wu +5 more
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METHOD FOR ASSESSING THE STRUCTURAL RELIABILITY OF NETWORKS WITH UNDETERMINED TOPOLOGY
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska, 2020 This paper shows the relevance of the task of assessing the structural reliability of networks with undetermined topology. Proposed is a method for assessing the structural reliability of networks of undetermined topology based on taking into account the
Nina Kniazieva +2 more
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Power Grid Structure Performance Evaluation Based on Complex Network Cascade Failure Analysis
Energies, 2023 A safe and stable operation power system is very important for the maintenance of national industrial security and social economy. However, with the increasing complexity of the power grid topology and its operation, new challenges in estimating and ...
Di Zhang +5 more
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Identification of a class of index models: A topological approach [PDF]
The Econometrics Journal, 2020 Summary We establish nonparametric identification in a class of so-called index models by using a novel approach that relies on general topological results. Our proof strategy requires substantially weaker conditions on the functions and distributions characterising the model than those required by existing strategies; in particular, it ...
Mogens Fosgerau, Dennis Kristensen
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Jixie qiangdu, 2023 A piston lattice structure design method based on reliability topology optimization is proposed for the lightweight design of internal combustion engine pistons, which is decomposed into two parts of reliability analysis and deterministic topology ...
CHEN JianLiang +3 more
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Applied Sciences, 2022 This study takes an approach to reliability-based topology optimization (RBTO) for 3D structures by applying an expansion of smoothing evolutionary structural optimization (SESO) and sequential element rejection and admission (SERA) for three-dimensional
Hélio Luiz Simonetti +4 more
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Sensors, 2018 In wireless sensor networks, nodes may adopt selfish behavior to save their energy resources, which causes energy imbalance among nodes, because of lacking a central controller with the function of making nodes cooperate.
Yongwen Du +3 more
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