Results 21 to 30 of about 57,696 (238)

Covariant gauge fixing and Kuchar decomposition [PDF]

, 1999
The symplectic geometry of a broad class of generally covariant models is studied. The class is restricted so that the gauge group of the models coincides with the Bergmann-Komar group and the analysis can focus on the general covariance.
A. Ashtekar, A. E. Fischer, A. E. Fischer, A. E. Fischer, A. Einstein, A. Weinstein, B. C. DeWitt, C. G. Torre, C. J. Isham, C. J. Isham, J. E. Marsden, J. E. Marsden, J. Kijowski, J. Kijowski, J. Stachel, K. Fredenhagen, K. V. Kuchař, K. V. Kuchař, K. V. Kuchař, K. V. Kuchař, K. V. Kuchař, K. V. Kuchař, K. V. Kuchař, M. Henneaux, P. G. Bergmann, P. Hájíc̆ek, P. Hájíc̆ek, P. R. Chernoff, R. Abraham, R. P. Geroch, R. S. Arnowitt, S. Lang, V. Moncrief, Y. Choquet-Bruhat   +33 more
core   +3 more sources

Lectures on Structural Stability in Dynamics

, 2017
These lectures present results and problems on the characterization of structurally stable dynamics. We will shed light those which do not seem to depend on the regularity class (holomorphic or differentiable).
Berger, Pierre
core   +2 more sources

Time-varying Projected Dynamical Systems with Applications to Feedback Optimization of Power Systems

, 2018
This paper is concerned with the study of continuous-time, non-smooth dynamical systems which arise in the context of time-varying non-convex optimization problems, as for example the feedback-based optimization of power systems. We generalize the notion
Bolognani, Saverio, Dörfler, Florian, Hauswirth, Adrian, Hug, Gabriela, Subotić, Irina   +4 more
core   +1 more source

Least Squares Shadowing method for sensitivity analysis of differential equations [PDF]

, 2017
For a parameterized hyperbolic system $\frac{du}{dt}=f(u,s)$ the derivative of the ergodic average $\langle J \rangle = \lim_{T \to \infty}\frac{1}{T}\int_0^T J(u(t),s)$ to the parameter $s$ can be computed via the Least Squares Shadowing algorithm (LSS).
Blonigan, Patrick J., Chater, Mario, Ni, Angxiu, Wang, Qiqi   +3 more
core   +2 more sources

R-matrix approach to integrable systems on time scales [PDF]

, 2008
A general unifying framework for integrable soliton-like systems on time scales is introduced. The $R$-matrix formalism is applied to the algebra of $\delta$-differential operators in terms of which one can construct infinite hierarchy of commuting ...
Aulbach B Hilger S, Bohner M, Bohner M, Burcu Silindir, Błaszak M, Błaszak M Gürses M Silindir B Szablikowski B M, Błażej M Szablikowski, Dickey L A, Hilger S, Maciej Błaszak, Olver P J, Reyman A G   +11 more
core   +4 more sources

Enteropathogenic E. coli shows delayed attachment and host response in human jejunum organoid‐derived monolayers compared to HeLa cells

FEBS Letters, EarlyView.
Enteropathogenic E. coli (EPEC) infects the human intestinal epithelium, resulting in severe illness and diarrhoea. In this study, we compared the infection of cancer‐derived cell lines with human organoid‐derived models of the small intestine. We observed a delayed in attachment, inflammation and cell death on primary cells, indicating that host ...
Mastura Neyazi, Pilar Samperio Ventayol, Natalie Burkard, Nicolas Schlegel, Carmen Aguilar, Sina Bartfeld   +5 more
wiley   +1 more source

An Analytical Construction of the SRB Measures for Baker-type Maps [PDF]

, 1998
For a class of dynamical systems, called the axiom-A systems, Sinai, Ruelle and Bowen showed the existence of an invariant measure (SRB measure) weakly attracting the temporal average of any initial distribution that is absolutely continuous with respect
Besicovitch A. S., de Rham G., de Rham G., Hata M., Hunt B. R., J. R. Dorfman, S. Tasaki, Takagi T., Thomas Gilbert, Weierstrass K.   +9 more
core   +2 more sources

Parametric Inequalities for s-Convex Stochastic Processes via Caputo Fractional Derivatives

Axioms
This paper establishes a general parametric integral identity involving (n+1)-times differentiable stochastic processes, formulated entirely in terms of stochastic k-Caputo fractional derivatives.
Ymnah Alruwaily, Rabab Alzahrani, Fatimah Alshahrani, Badreddine Meftah, Raouf Fakhfakh   +4 more
doaj   +1 more source

Extended Differential Balancing for Nonlinear Dynamical Systems

IEEE Control Systems Letters, 2022
In this paper, we construct extended balancing theory for nonlinear systems in the contraction framework. At first, we introduce the concept of the extended differential observability Gramian and inverse of the extended differential controllability Gramian for nonlinear dynamical systems and show their correspondence with generalized differential ...
Arijit Sarkar, Jacquelien M. A. Scherpen
openaire   +1 more source

Organoids in pediatric cancer research

FEBS Letters, EarlyView.
Organoid technology has revolutionized cancer research, yet its application in pediatric oncology remains limited. Recent advances have enabled the development of pediatric tumor organoids, offering new insights into disease biology, treatment response, and interactions with the tumor microenvironment.
Carla Ríos Arceo, Jarno Drost
wiley   +1 more source