Results 31 to 40 of about 34,434 (155)

Invariant measures of the 2D Euler and Vlasov equations [PDF]

, 2010
We discuss invariant measures of partial differential equations such as the 2D Euler or Vlasov equations. For the 2D Euler equations, starting from the Liouville theorem, valid for N-dimensional approximations of the dynamics, we define the ...
Chavanis P H, Chavanis P H Campa A Giansanti A Morigi G Labini F S, Courant R, Dauxois T, Eyink G, Freddy Bouchet, Holm D D Marsden J E Ratiu T S, Kiessling M K-H Campa A Giansanti A Morigi G Labini F S, Kraichnan R H, Lee T D, Lynden-Bell D, Marianne Corvellec, Mattingly J C Sinai Y G, Mouhot C Villani C, Robert R, Rockafellar R T, Salmon R, Spohn H   +17 more
core   +3 more sources

Coulomb field of an accelerated charge: physical and mathematical aspects [PDF]

, 1991
The Maxwell field equations relative to a uniformly accelerated frame, and the variational principle from which they are obtained, are formulated in terms of the technique of geometrical gauge invariant potentials.
C Teitelboim, C. Teitelboim, C. Teitelboim, C. Teitelboim, D. A. Macdonald, D. A. Macdonald, D. G. Boulware, F. Strocchi, Francis J. Alexander, I. S. Gradshteyn, J. A. Wheeler, J. D. Bekenstein, J. D. Jackson, R. L. Znajek, R. P. Feynman, R. S. Hanni, S. A. Fulling, S. Schweber, T. Damour, T. Damour, U. H. Gerlach, U. H. Gerlach, U. H. Gerlach, U. H. Gerlach, U. H. Gerlach, U. H. Gerlach, Ulrich H. Gerlach, W. H. Press, W. N. Bailey   +28 more
core   +2 more sources

Gearbox Composite Fault Diagnosis Method Based on Minimum Entropy Deconvolution and Improved Dual-Tree Complex Wavelet Transform

Entropy, 2018
Dual-tree complex wavelet transform has been successfully applied to the composite diagnosis of a gearbox and has achieved good results. However, it has some fatal weaknesses, so this paper proposes an improved dual-tree complex wavelet transform (IDTCWT)
Ziying Zhang, Xi Zhang, Panpan Zhang, Fengbiao Wu, Xuehui Li   +4 more
doaj   +1 more source

Planetary Gearbox Fault Diagnosis Based on ICEEMD-Time-Frequency Information Entropy and VPMCD

Applied Sciences, 2020
Planetary gearboxes are more and more widely used in large and complex construction machinery such as those used in aviation, aerospace fields, and so on.
Yihan Wang, Zhonghui Fan, Hongmei Liu, Xin Gao   +3 more
doaj   +1 more source

Mine seismic adaptive noise suppression method based on VMD and GA-SVM

Meitan xuebao
The seismic signals collected underground in coal mines often exhibit complex waveforms accompanied by significant noise interference, leading to a reduction in the accuracy of first arrival time picking of seismic signals and thereby impacting the ...
Bo WANG, Sihongren SHEN, Liyuan YU, Shengdong LIU, Linfeng ZENG   +4 more
doaj   +1 more source

Parallel preconditioners for high order discretizations arising from full system modeling for brain microwave imaging [PDF]

, 2016
This paper combines the use of high order finite element methods with parallel preconditioners of domain decomposition type for solving electromagnetic problems arising from brain microwave imaging.
Bonazzoli, Cai, Dolean, Dolean, Hecht, Mikael, Nédélec, Parks, Rapetti, Rapetti, Semenov   +10 more
core   +5 more sources

Improved Variational Mode Decomposition Based on Scale Space Representation for Fault Diagnosis of Rolling Bearings

Sensors
Accurate extraction of weak fault information from non-stationary vibration signals collected by vibration sensors is challenging due to severe noise and interference.
Baoxiang Wang, Guoqing Liu, Jihai Dai, Chuancang Ding   +3 more
doaj   +1 more source

A multi-modal feature combination mechanism for identification of harmonic load in distribution networks based on artificial intelligence models

International Journal of Electrical Power & Energy Systems
The challenge of harmonic pollution in active distribution networks is inherently complex, a data-driven approach being necessitated to comprehensively capture the nonlinear and non-stationary characteristics of harmonic power sequence signals, thereby ...
Renzeng Yang, Shuang Peng, Gang Yao
doaj   +1 more source

Classical and Quantum Ensembles via Multiresolution. I. BBGKY Hierarchy

, 2004
A fast and efficient numerical-analytical approach is proposed for modeling complex behaviour in the BBGKY hierarchy of kinetic equations. We construct the multiscale representation for hierarchy of reduced distribution functions in the variational ...
Antonina N. Fedorova, Balescu, Fedorova, Meyer, Michael G. Zeitlin   +4 more
core   +1 more source

Transfer matrices and excitations with matrix product states [PDF]

, 2015
We use the formalism of tensor network states to investigate the relation between static correlation functions in the ground state of local quantum many-body Hamiltonians and the dispersion relations of the corresponding low-energy excitations.
Degroote, Matthias, Draxler, Damian, Haegeman, Jutho, Rams, Marek M, Schuch, Norbert, Stojevic, Vid, Vanderstraeten, Laurens, Verstraete, Frank, Zauner, Valentin   +8 more
core   +2 more sources