Results 81 to 90 of about 762 (171)

Symplectic Geometry

open access: yes, 2005
This is an overview article on selected topics in symplectic geometry written for the Handbook of Differential Geometry (volume 2, edited by F.J.E. Dillen and L.C.A. Verstraelen).
openaire   +2 more sources

Geometry of Invariant Tori of Certain Integrable Systems with Symmetry and an Application to a Nonholonomic System

open access: yesSymmetry, Integrability and Geometry: Methods and Applications, 2007
Bifibrations, in symplectic geometry called also dual pairs, play a relevant role in the theory of superintegrable Hamiltonian systems. We prove the existence of an analogous bifibrated geometry in dynamical systems with a symmetry group such that the ...
Francesco Fassò, Andrea Giacobbe
doaj  

Real symplectic geometry

open access: yes, 2009
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +2 more sources

基于ISGMD⁃RPT的滚动轴承故障诊断方法

open access: yesZhendong Ceshi yu Zhenduan
针对传统辛几何模态分解(symplectic geometry mode decomposition, 简称SGMD)方法因嵌入维数选择依靠经验公式,导致出现信号模态混叠和过度分解的问题,提出了一种改进的辛几何模态分解(improved symplectic geometry mode decomposition, 简称ISGMD)方法。首先,通过计算原始信号的功率谱密度得到最大主峰的频率并设定嵌入维数区间,根据峭度准则筛选分解后的辛几何分量(symplectic geometry component,
doaj   +1 more source

Symplectic geometry of conical symplectic resolutions

open access: yes, 2020
Ever since Kronheimer's celebrated hyperkähler construction of gravitational instantons thirty years ago, many similar constructions have appeared in the mathematical literature, eventually producing a vast class of holomorphic symplectic manifolds nowadays called Conical Symplectic Resolutions (CSRs).
openaire   +1 more source

Accuracy-Improved Fault Diagnosis Method for Rolling Bearing Based on Enhanced ESGMD-CC and BA-ELM Model

open access: yesShock and Vibration
The current methods for early fault diagnosis of rolling bearing have some flaws, such as poor fault feature information and insufficient fault feature extraction capability, which makes it challenging to guarantee fault diagnosis accuracy.
Wei Yuan   +5 more
doaj   +1 more source

$\mathbf {5 \times 5}$ -graded Lie algebras, cubic norm structures and quadrangular algebras

open access: yesForum of Mathematics, Sigma
We study simple Lie algebras generated by extremal elements, over arbitrary fields of arbitrary characteristic. We show the following: (1) If the extremal geometry contains lines, then the Lie algebra admits a $5 \times 5$ -grading that can be ...
Tom De Medts, Jeroen Meulewaeter
doaj   +1 more source

Symplectic Geometry and Circuit Quantization

open access: yesPRX Quantum
Circuit quantization is an extraordinarily successful theory that describes the behavior of quantum circuits with high precision. The most widely used approach of circuit quantization relies on introducing a classical Lagrangian whose degrees of freedom are either magnetic fluxes or electric charges in the circuit.
Andrew Osborne   +5 more
openaire   +2 more sources

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