Results 291 to 300 of about 9,926,750 (356)

Interpenetrating Nets: Ordered, Periodic Entanglement

Angewandte Chemie International Edition, 1998
Independent one-, two-, and even three-dimensional nets interpenetrate each other in many solid-state structures of polymeric, hydrogen-bonded nets and coordination polymers. For example, the interpenetration of the adamantane units of two diamondlike nets is shown on the right.
Stuart R, Batten, Richard, Robson
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Rolling Bearing Fault Diagnosis Method Base on Periodic Sparse Attention and LSTM

IEEE Sensors Journal, 2022
The rolling bearing fault signals are complex time series with complex dynamic characteristics and non-uniform periodicity due to the influence of random interference, such as random impulse noise and equipment vibration. This will affect the accuracy of
Yiyao An, Ke Zhang, Qie Liu, Yi Chai, Xinghua Huang   +4 more
semanticscholar   +1 more source

(ω,c)‐asymptotically periodic functions, first‐order Cauchy problem, and Lasota‐Wazewska model with unbounded oscillating production of red cells

Mathematical methods in the applied sciences, 2019
In this paper, we study a new class of functions, which we call (ω,c)‐asymptotically periodic functions. This collection includes asymptotically periodic, asymptotically antiperiodic, asymptotically Bloch‐periodic, and unbounded functions.
E. Alvarez, S. Castillo, M. Pinto
semanticscholar   +1 more source

Period Doubling with Higher-Order Degeneracies

SIAM Journal on Mathematical Analysis, 1991
The authors consider a family of local diffeomorphisms \(G(x,\mu)\), \(G(x_ 0,\mu_ 0)=x_ 0\), where i) \(G: U\to\mathbb{R}^ n\), \(U\) is a neighbourhood of \((x_ 0,\mu_ 0)\) in \(\mathbb{R}^ n\times\mathbb{R}^ k\); ii) \(D_ x(x_ 0,\mu_ 0)\) has a single eigenvalue of \(-1\) and no other eigenvalues on the unit circle; iii) on its one-dimensional ...
Peckham, Bruce B., Kevrekidis, Ioannis G.   +1 more
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Almost-Periodic Higher Order Statistic Estimation

IEEE Transactions on Information Theory, 2011
In this paper, stochastic processes with higher order statistical functions decomposable into an almost-periodic function plus a residual term not containing finite-strength additive sinewave components are considered. These processes arise in mobile communications when almost-cyclostationary (ACS) processes pass through time-varying channels.
NAPOLITANO, ANTONIO, TESAURO M.
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Periodic Phases in Second-Order Materials

Archive for Rational Mechanics and Analysis, 1998
The title of this paper is misleading because the notion of ``second-order'' materials is not uniquely accepted. Here the authors are in fact dealing with a material whose energy density depends not only on density and its first spatial gradients (like in some approaches to capillarity), but also on the second gradient of density. These would be called
Mizel, V. J., Peletier, L. A., Troy, W. C.   +2 more
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A second‐order reduced asymptotic homogenization approach for nonlinear periodic heterogeneous materials

International Journal for Numerical Methods in Engineering, 2019
An efficient second‐order reduced asymptotic homogenization approach is developed for nonlinear heterogeneous media with large periodic microstructure.
J. Fish, Zhiqiang Yang, Zifeng Yuan
semanticscholar   +1 more source

Third-order systems: Periodicity conditions

International Journal of Non-Linear Mechanics, 2009
Abstract Recently a third-order existence theorem has been proven to establish the sufficient conditions of periodicity for the most general third-order ordinary differential equation x ‴ + f ( t , x , x ′ , x ″ ) = 0 In this paper we prove a new theorem, and establish a new sufficient condition for ...
Reza N. Jazar, M. Mahinfalah, B. Mehri
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Second-order supersymmetric periodic potentials

Physics Letters A, 2000
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Fernández C., David J., Negro, Javier, Nieto, Luis M.   +2 more
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Periodic Splines of Complex Order

Numerical Functional Analysis and Optimization, 2012
We construct univariate periodic splines of complex order and prove multiresolution and localization properties.
Brigitte Forster, Peter Massopust, Thomas Übelacker   +2 more
openaire   +1 more source