Results 91 to 100 of about 44,794 (286)

A Variational Principle for the Axisymmetric Stability of Rotating Relativistic Stars

, 2016
It is well known that all rotating perfect fluid stars in general relativity are unstable to certain non-axisymmetric perturbations via the Chandrasekhar-Friedman-Schutz (CFS) instability.
Prabhu, Kartik, Schiffrin, Joshua S., Wald, Robert M.   +2 more
core   +1 more source

Understanding and Optimizing Li Substitution in P2‐Type Sodium Layered Oxides for Sodium‐Ion Batteries

Advanced Functional Materials, EarlyView.
This work explores Li‐substituted P2 layered oxides for Na‐ion batteries by crystallographic and electrochemical studies. The effect of lithium on superstructure orderings, on phase transitions during synthesis and electrochemical cycling and on the interplay of O‐ versus TM‐redox is revealed via various advanced techniques, including semi‐simultaneous 
Mingfeng Xu, Giovanni Gammaitoni, Michael Häfner, Eduardo Villalobos‐Portillo, Carlo Marini, Matteo Bianchini   +5 more
wiley   +1 more source

Consistent Dynamic Mode Decomposition

, 2019
We propose a new method for computing Dynamic Mode Decomposition (DMD) evolution matrices, which we use to analyze dynamical systems. Unlike the majority of existing methods, our approach is based on a variational formulation consisting of data alignment
Azencot, Omri, Bertozzi, Andrea, Yin, Wotao   +2 more
core  

NanoMOF‐Based Multilevel Anti‐Counterfeiting by a Combination of Visible and Invisible Photoluminescence and Conductivity

Advanced Functional Materials, EarlyView.
This study presents novel anti‐counterfeiting tags with multilevel security features that utilize additional disguise features. They combine luminescent nanosized Ln‐MOFs with conductive polymers to multifunctional mixed‐matrix membranes and powder composites. The materials exhibit visible/NIR emission and matrix‐based conductivity even as black bodies.
Moritz Maxeiner, Ruben Maile, Murat Cuvalli, Andreas Wolf, Ayisha Komal, Robert Oestreich, Christoph Janiak, Karl Mandel, Alexander Knebel, Klaus Müller‐Buschbaum   +9 more
wiley   +1 more source

A decomposition clustering ensemble learning approach for forecasting foreign exchange rates

Journal of Management Science and Engineering, 2019
A decomposition clustering ensemble (DCE) learning approach is proposed for forecasting foreign exchange rates by integrating the variational mode decomposition (VMD), the self-organizing map (SOM) network, and the kernel extreme learning machine (KELM).
Yunjie Wei, Shaolong Sun, Jian Ma, Shouyang Wang, Kin Keung Lai   +4 more
doaj   +1 more source

Fermions on an Interval: Quark and Lepton Masses without a Higgs

, 2003
We consider fermions on an extra dimensional interval. We find the boundary conditions at the ends of the interval that are consistent with the variational principle, and explain which ones arise in various physical circumstances.
A. Pomarol, A. Pomarol, B. Holdom, B. Holdom, C. Csáki, C. Csáki, C. Csáki, C. Csáki, C.A. Scrucca, Christophe Grojean, Csaba Csáki, D.B. Kaplan, D.E. Kaplan, D.T. Son, G. Burdman, G. Hiller, G. Hiller, H. Davoudiasl, H. Davoudiasl, H. Davoudiasl, I. Gogoladze, I. Gogoladze, J. Bagger, J. Bagger, J.A. Bagger, J.L. Hewett, Jay Hubisz, John Terning, K. Agashe, K. Yamawaki, L. Randall, L. Randall, L. Randall, L. Randall, M. Carena, M. Carena, M.E. Shaposhnikov, N. Arkani-Hamed, R. Barbieri, R. Rattazzi, R.S. Chivukula, R.S. Chivukula, R.S. Chivukula, S. Chang, S. De Curtis, S. De Curtis, S.J. Huber, S.J. Huber, S.J. Huber, S.J. Huber, S.J. Huber, S.J. Huber, T. Appelquist, T. Appelquist, T. Appelquist, T. Gherghetta, Y. Abe, Y. Grossman, Y. Nomura, Y. Nomura, Yuri Shirman   +60 more
core   +1 more source

Biodegradable and Recyclable Luminescent Mixed‐Matrix‐Membranes, Hydrogels, and Cryogels based on Nanoscale Metal‐Organic Frameworks and Biopolymers

Advanced Functional Materials, EarlyView.
The study presents biodegradable and recyclable mixed‐matrix membranes (MMMs), hydrogels, and cryogels using luminescent nanoscale metal‐organic frameworks (nMOFs) and biopolymers. These bio‐nMOF‐MMMs combine europium‐based nMOFs as probes for the status of the materials with the biopolymers agar and gelatine and present alternatives to conventional ...
Moritz Maxeiner, Julian Burkhart, Kateryna Borysova, Chiara Mazzariol, Klaus Müller‐Buschbaum   +4 more
wiley   +1 more source

Statistical mechanics of Beltrami flows in axisymmetric geometry: Theory reexamined

, 2010
A simplified thermodynamic approach of the incompressible axisymmetric Euler equations is considered based on the conservation of helicity, angular momentum and microscopic energy.
Aurore Naso, Bérengère Dubrulle, D. Montgomery, Pierre-Henri Chavanis, Romain Monchaux   +4 more
core   +3 more sources

Laser‐Induced Graphene from Waste Almond Shells

Advanced Functional Materials, EarlyView.
Almond shells, an abundant agricultural by‐product, are repurposed to create a fully bioderived almond shell/chitosan composite (ASC) degradable in soil. ASC is converted into laser‐induced graphene (LIG) by laser scribing and proposed as a substrate for transient electronics.
Yulia Steksova, Anna Chiara Bressi, Marina Galliani, Attilio Marino, Gianni Ciofani, Eduardo Machado‐Charry, Hilda Gomez Bernal, Alessandra Francini, Luca Sebastiani, Francesco Greco   +9 more
wiley   +1 more source

A Single-End Location Method for Small Current Grounding System Based on the Minimum Comprehensive Entropy Kurtosis Ratio and Morphological Gradient

Applied Sciences
Fault location technology is crucial for enhancing the efficiency of fault maintenance and ensuring the safety of the power supply in small current grounding systems.
Jiyuan Cao, Yanwen Wang, Lingjie Wu, Yongmei Zhao, Le Wang   +4 more
doaj   +1 more source