Results 31 to 40 of about 442,631 (299)

Non-Gaussian Diffusion Near Surfaces

Physical Review Letters, 2023
We study the diffusion of particles confined close to a single wall and in double-wall planar channel geometries where the local diffusivities depend on the distance to the boundaries. Displacement parallel to the walls is Brownian as characterized by its variance, but it is non-Gaussian having a non-zero fourth cumulant.
Arthur Alexandre, Maxime Lavaud, Nicolas Fares, Elodie Millan, Yann Louyer, Thomas Salez, Yacine Amarouchene, Thomas Guérin, David S. Dean   +8 more
openaire   +4 more sources

Non-Gaussian analysis of diffusion weighted imaging in head and neck at 3T: a pilot study in patients with nasopharyngeal carcinoma. [PDF]

PLoS ONE, 2014
PURPOSE:To technically investigate the non-Gaussian diffusion of head and neck diffusion weighted imaging (DWI) at 3 Tesla and compare advanced non-Gaussian diffusion models, including diffusion kurtosis imaging (DKI), stretched-exponential model (SEM ...
Jing Yuan, David Ka Wai Yeung, Greta S P Mok, Kunwar S Bhatia, Yi-Xiang J Wang, Anil T Ahuja, Ann D King   +6 more
doaj   +1 more source

Non-Gaussian, non-dynamical stochastic resonance [PDF]

, 2013
The archetypal system demonstrating stochastic resonance is nothing more than a threshold triggered device. It consists of a periodic modulated input and noise. Every time an output crosses the threshold the signal is recorded.
Dybiec, Bartlomiej, Szczepaniec, Krzysztof   +1 more
core   +3 more sources

Generating non-Gaussian maps with a given power spectrum and bispectrum [PDF]

, 2001
We propose two methods for generating non-Gaussian maps with fixed power spectrum and bispectrum. The first makes use of a recently proposed rigorous, non-perturbative, Bayesian framework for generating non-Gaussian distributions.
A. R. Cooray, A. Refregier, C. Contaldi, C. R. Contaldi, Carlo R. Contaldi, D. A. Varsalovich, D. M. Goldberg, D. N. Spergel, E. Merzbacher, Eiichiro Komatsu, G. F. Smoot, J. Magueijo, J. Magueijo, João Magueijo, K. Schulten, L. Knox, M. Abramowitz, M. G. Kendall, P. G. Ferreira, U. Seljak, W. H. Press   +20 more
core   +2 more sources

Classical simulation of Gaussian quantum circuits with non-Gaussian input states

Physical Review Research, 2021
We consider Gaussian quantum circuits supplemented with non-Gaussian input states and derive sufficient conditions for efficient classical strong simulation of these circuits. In particular, we generalise the stellar representation of continuous-variable
Ulysse Chabaud, Giulia Ferrini, Frédéric Grosshans, Damian Markham   +3 more
doaj   +1 more source

Equivalent non-Gaussian excitation method for moment calculation of non-Gaussian randomly excited systems

Nihon Kikai Gakkai ronbunshu, 2015
Equivalent non-Gaussian excitation method is developed to obtain the statistical moments up to 4th order of the response of non-Gaussian randomly excited systems. The non-Gaussian excitation is prescribed by the probability density function and the power
Takahiro TSUCHIDA, Koji KIMURA
doaj   +1 more source

Observation impact in data assimilation: the effect of non-Gaussian observation error [PDF]

Tellus: Series A, Dynamic Meteorology and Oceanography, 2013
Data assimilation methods which avoid the assumption of Gaussian error statistics are being developed for geoscience applications. We investigate how the relaxation of the Gaussian assumption affects the impact observations have within the assimilation ...
Alison Fowler, Peter Jan Van Leeuwen
doaj   +1 more source

Impossibility to produce arbitrary non-Gaussian states using zero-mean Gaussian states and partial photon number resolving detection

Physical Review Research, 2021
Gaussian states and measurements collectively are not powerful-enough resources for quantum computing, as any Gaussian dynamics can be simulated efficiently, classically.
Christos N. Gagatsos, Saikat Guha
doaj   +1 more source

A non-Gaussian landscape [PDF]

, 2013
Primordial perturbations with wavelengths greater than the observable universe shift the effective background fields in our observable patch from their global averages over the inflating space.
A. Linde, A.A. Starobinsky, A.D. Linde, B. Freivogel, C.T. Byrnes, C.T. Byrnes, C.T. Byrnes, C.T. Byrnes, C.T. Byrnes, Christian T Byrnes, D.H. Lyth, E. Nelson, G. Tasinato, Gianmassimo Tasinato, K. Enqvist, K. Enqvist, K. Enqvist, L. Kofman, M. Gerstenlauer, N.S. Sugiyama, Planck collaboration, Q.-G. Huang, S.B. Giddings, Sami Nurmi, T. Suyama, V. Assassi, V. Demozzi, W. Unruh   +27 more
core   +2 more sources

Application of maximum statistical entropy in formulating a non-gaussian probability density function in flow uncertainty analysis with prior measurement knowledge

International Journal of Metrology and Quality Engineering
In mechanical, civil and chemical engineering systems the accuracies of flow measurement instruments is conventionally specified by certified measurement capabilities (CMCs) that are symmetric, however it is physically possible for some flow instruments ...
Ramnath Vishal
doaj   +1 more source