Results 31 to 40 of about 1,144,435 (297)

Uncovering Hidden Insights with Long-Memory Process Detection: An In-Depth Overview

open access: yesRisks, 2023
Long-memory models are frequently used in finance and other fields to capture long-range dependence in time series data. However, correctly identifying whether a process has long memory is crucial.
Hossein Hassani   +2 more
doaj   +1 more source

Construction of estimates of spectral densities with a given accuracy over intersecting intervals of observations

open access: yesЖурнал Белорусского государственного университета: Математика, информатика, 2019
The article proposes a new method for determining the number of splitting intervals and the number of observations in them when building estimates of the spectral densities of stationary random processes with a given accuracy over intersecting ...
Natalia V. Semenchuk
doaj   +1 more source

Dirac operator spectral density and low energy sum rules

open access: yes, 2000
The spectral density of euclidean Dirac operator is investigated in partially quenched QCD with arbitrary quark masses. A representation of scalar and pseudoscalar correlators in terms of the spectral density is discussed.
Zyablyuk, K.
core   +1 more source

Constant and switched bias low frequency noise in p-MOSFETs with varying gate oxide thickness [PDF]

open access: yes, 2002
The low-frequency noise power spectral density of MOSFETs is decreased if the MOSFETs are periodically switched 'off' (switched bias conditions). The influence of the gate oxide thickness on fixed bias and switched biased low frequency drain current ...
Knitel, M.J.   +3 more
core   +2 more sources

Spectral density of the non-backtracking operator

open access: yes, 2014
The non-backtracking operator was recently shown to provide a significant improvement when used for spectral clustering of sparse networks. In this paper we analyze its spectral density on large random sparse graphs using a mapping to the correlation ...
Krzakala, Florent   +2 more
core   +1 more source

Recent Advances in the Calculation of Dynamical Correlation Functions

open access: yesFrontiers in Physics, 2020
We review various theoretical methods that have been used in recent years to calculate dynamical correlation functions of many-body systems. Time-dependent correlation functions and their associated frequency spectral densities are the quantities of ...
J. Florencio, O. F. de Alcantara Bonfim
doaj   +1 more source

Electromagnetohydrodynamic (EMHD) Flow in a Microchannel with Random Surface Roughness

open access: yesMicromachines, 2023
This study investigates the effect of small random transverse wall roughness on electromagnetohydrodynamic (EMHD) flow is in a microchannel, employing the perturbation method based upon stationary random function theory.
Nailin Ma, Yanjun Sun, Yongjun Jian
doaj   +1 more source

The Spectral Function for Finite Nuclei in the Local Density Approximation [PDF]

open access: yes, 1994
The spectral function for finite nuclei is computed within the framework of the Local Density Approximation, starting from nuclear matter spectral functions obtained with a realistic nucleon-nucleon interaction. The spectral function is decomposed into a
de Guerra, E. Moya   +2 more
core   +2 more sources

A Large Deviation Principle and an Expression of the Rate Function for a Discrete Stationary Gaussian Process

open access: yesEntropy, 2014
We prove a large deviation principle for a stationary Gaussian process over Rb,indexed by Ζd (for some positive integers d and b), with positive definite spectral density, andprovide an expression of the corresponding rate function in terms of the mean ...
Olivier Faugeras, James MacLaurin
doaj   +1 more source

Spectral analysis of stationary random bivariate signals

open access: yes, 2017
A novel approach towards the spectral analysis of stationary random bivariate signals is proposed. Using the Quaternion Fourier Transform, we introduce a quaternion-valued spectral representation of random bivariate signals seen as complex-valued ...
Bihan, Nicolas Le   +2 more
core   +2 more sources

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