23 papers · ranked by Valyu relevance
Bharat Monga, Jeff Moehlis
Oscillators - dynamical systems with stable periodic orbits - arise in many systems of physical, technological, and biological interest. The standard phase reduction, a model reduction technique based on isochrons, can be unsuitable for oscillators which have a small-magnitude negative nontrivial Floquet exponent. This…
Petar Mircheski, Jinjie Zhu, Hiroya Nakao
We present a phase-amplitude reduction framework for analyzing collective oscillations in networked dynamical systems. The framework, which builds on the phase reduction method, takes into account not only the collective dynamics on the limit cycle but also deviations from it by introducing amplitude variables and…
Makoto Iima
Phase reduction theory has been applied to many systems with limit cycles; however, it has limited applications in incompressible fluid systems. This is because the calculation of the phase sensitivity function, one of the fundamental functions in phase reduction theory, has a high computational cost for systems with a…
Pierre Houzelstein, Peter J. Thomas, Benjamin Lindner, Boris Gutkin + 1 more
'Alberto Pérez-Cervera'] Phase reduction is an important tool for studying coupled and driven oscillators. The question of how to generalize phase reduction to stochastic oscillators remains actively debated. In this work, we propose a method to derive a self-contained stochastic phase equation of the form dϑ =…
Haoyang Fu, Qingze Chen, Benzhi Min, Shuzhou Li + 2 more
Probing the molecular-level redox behavior and mechanism of oxides is essential to developing innovative applications in different fields such as catalysis, but remains a challenge for the scientific community. Using in-situ transmission electron microscopy, here we provide an overall reduction view of…
Bakyt Suleimen, Almas Yerzhanov, Nurlybai Kosdauletov, Galymzhan Adilov + 9 more
'Galymzhan Adilov' 'Assylbek Nurumgaliyev' 'Assemay Pushanova' 'Bauyrzhan Kelamanov' 'Pavel Gamov' 'Konstantin Smirnov' 'Talgat Zhuniskaliyev' 'Yerbol Kuatbay' 'Assylbek Abdirashit' 'Chih-Chun Hsieh'] This study investigates the behavior of phosphorus during high-temperature smelting of hydrogen-reduced high-phosphorus…
Marcus J. Kitchen, Genevieve A. Buckley, Timur E. Gureyev, Megan J. Wallace + 4 more
'Megan J. Wallace' 'Nico Andres-Thio' 'Kentaro Uesugi' 'Naoto Yagi' 'Stuart B. Hooper'] Phase-contrast X-ray imaging can improve the visibility of weakly absorbing objects (e.g. soft tissues) by an order of magnitude or more compared to conventional radiographs. Combining phase retrieval with computed tomography (CT)…
Quynh N. Nguyen, Eun Mi Kim, Yong Ding, Annemieke Janssen + 5 more
of Reduction Kinetics in the Phase-Controlled Growth on Preformed Nanocrystal Seeds: A Case Study of Ru Authors: ['Quynh\nN. Nguyen' 'Eun Mi Kim' 'Yong Ding' 'Annemieke Janssen' 'Chenxiao Wang' 'Kei Kwan Li' 'Junseok Kim' 'Kristen A. Fichthorn' 'Younan Xia'] This study demonstrates the crucial role of reduction…
Bakyt Suleimen, Nurlybai Kosdauletov, Galymzhan Adilov, Pavel Gamov + 6 more
Reduction of iron in high-phosphorus oolitic ore from the Lisakovsk deposit using solid carbon, carbon monoxide, and hydrogen. An X-ray phase analysis was used to determine the phase composition of the samples after reduction roasting. When reduced with carbon monoxide or hydrogen, α-iron appears in the samples, while…
Vyacheslav Lysov
We describe the symplectic reduction construction for the physical phase space in gauge theory and apply it for the BF theory. Symplectic reduction theorem allows us to rewrite the same phase space as a quotient by the gauge group action, what matches with the covariant phase space formalism. We extend the symplectic…
David Salido-Monzú, Francisco J. Meca-Meca, Ernesto Martín-Gorostiza, José L. Lázaro-Galilea + 1 more
'José L. Lázaro-Galilea' 'Xue Wang'] A wide range of measuring applications rely on phase estimation on sinusoidal signals. These systems, where the estimation is mainly implemented in the digital domain, can generally benefit from the use of undersampling to reduce the digitizer and subsequent digital processing…
Marvin Michak, Frank‐Constantin Ideker, Holger Kohlmann
In situ X-ray diffraction studies were conducted to elucidate the reduction pathways of U3O8 using various reducing agents, including hydrogen, the fluorinating agent polyvinylidene fluoride (PVDF), and calcium hydride (CaH2). The reduction processes were characterized by a transition from the orthorhombic…
Antoine Barbot, John T. Pirog, Cherlyn J. Ng, Geunyoung Yoon
How does the brain achieve a seemingly veridical and ‘in-focus’ perception of the world, knowing how severely corrupted visual information is by the eye’s optics? Optical blur degrades retinal image quality by reducing the contrast and disrupting the phase of transmitted signals. Neural adaptation can attenuate the…
Christoph Zechner, Frank Jülicher
Biomolecular condensates have been proposed to buffer intracellular concentrations and reduce noise. Recent results demonstrate that concentrations need not be buffered in multicomponent systems, leading to a non-constant saturation concentration ( c_sat_ ) when individual components are varied. Simplified equilibrium…
Yilei Li, Noah Toyonaga, James Jiang, Alex Cable + 1 more
Speckle is the major artifact in ultrasound imaging, and it is well-known that speckle can be reduced by compounding (averaging) images taken either at different frequencies or from different angles. By averaging images of a phantom taken over a frequency range and a 90° span of angles, the combined speckle reduction…
Authors not listed
Manganese (oxyhydr)oxides are abundant redox-active minerals that influence diverse biogeochemical processes, yet their redox reactivity remains poorly understood due to variations in mineral structure and manganese oxidation state. We quantified the reduction kinetics of three manganese oxides—birnessite, manganite…
Celine Lippens, Jo De Vrieze
Anaerobic digestion is shifting from a single-purpose technology for renewable energy recovery from organic waste streams to a process for integrated resource recovery. The valorisation of high-rate energy- and phosphorus-rich sludge creates the opportunity for their combined recovery. This phosphate is present in a…
Authors not listed
To rationalize and improve the performance of high energy density electrode materials for all-solid-state fluoride ion batteries and abstract the increasing demands of energy storage, it is important to gain a fundamental understanding of structure/phase evolution during cell operation, which is closely correlated to…
Daniel W. Davies, Sang Kyu Park, Stephen B. Shiring, Hyunjoong Chung + 7 more
Cooperativity is used by living systems to circumvent energetic and entropic barriers to yield highly efficient molecular processes. Cooperative structural transitions involve the simultaneous, concerted displacement of molecules in a crystalline material, in stark contrast to the more typical molecule-by-molecule…
Shani Doron, Nardy Lampl, Alon Savidor, Amir Pri-Or + 4 more
Photosynthetic induction, characterized by the lag in CO_2_ assimilation rates typically observed upon plant transition from darkness to light, has traditionally been attributed to Rubisco activase activity and stomatal opening. Yet, the faster induction of photosynthesis in the 2-Cys peroxiredoxins (Prxs) mutant…
Authors not listed
Reduction and oxidation are cornerstone transformations in organic synthesis. While reagents have traditionally been used to effect organic redox reactions, recent advances in electrochemical methodology have offered an attractive alternative approach. In principle, the electrification of these processes could minimize…
Authors not listed
Bio-oil derived from lignocellulosic biomass represents a sustainable alternative to fossil fuels as an energy source and chemical feedstock. Fast pyrolysis of lignocellulosic biomass yields a rich mixture of oxygenated organic species with low energy density and low stability, which can be electrochemically upgraded…
M Cao, H-B Zhang, Y Lu, R Nishi + 1 more
We have analysed the formation of streak artefacts in the reconstruction based on the filtered back projection algorithm in electron tomography (ET) and accordingly applied an adaptive interpolation technique to artefact reduction. In the adaptive interpolation to recover the missing information, the edge positions in…