Results 11 to 20 of about 10,004 (246)

Fourier-series expansion of the dark-energy equation of state [PDF]

Monthly notices of the Royal Astronomical Society, 2019
The dark-energy component of the Universe still remains a mystery; however, several papers based on observational data have shown that its equation of state may have an oscillatory behaviour.
D. Tamayo
semanticscholar   +1 more source

On the approximation accuracy of Gaussian variational inference [PDF]

Annals of Statistics, 2023
The main computational challenge in Bayesian inference is to compute integrals against a high-dimensional posterior distribution. In the past decades, variational inference (VI) has emerged as a tractable approximation to these integrals, and a viable ...
A. Katsevich, P. Rigollet
semanticscholar   +1 more source

Strapdown Attitude Computation: Functional Iterative Integration versus Taylor Series Expansion [PDF]

Gyroscopy and Navigation, 2019
—There are two basic approaches to strapdown attitude computation, namely, the traditional Taylor series expansion approach and the Picard iterative method.
Yuanxin Wu, Y. Litmanovich
semanticscholar   +1 more source

Modeling the Slant Wet Delays From One GPS Receiver as a Series Expansion With Respect to Time and Space: Theory and an Example of Application for the Tahiti Island

IEEE Transactions on Geoscience and Remote Sensing, 2020
Traditionally, the modeling of the water vapor contents of the atmosphere is done through the estimation of precipitable water (PW)—the integrated value of the mass of water vapor over a vertical column expressed in millimeter equivalent height.
Fangzhao Zhang, J. Barriot, Guochang Xu, M. Hopuare   +3 more
semanticscholar   +1 more source

A Numerical Examination of an Unsteady Nonlinear MHD Flow in the Presence of Thermal Radiation and Heat Generation

International Journal of Applied Mechanics and Engineering, 2021
In this study, the spectral perturbation method and the spectral relaxation method are used to solve the nonlinear differential equations of an unsteady nonlinear MHD flow in the presence of thermal radiation and heat generation.
T.M. Agbaje, P.G.L. Leach
doaj   +1 more source

Estimation of the order of the matrix method approximation of numerical integration of boundary-value problems for the second order inhomogeneous linear ordinary differential equations

Vestnik Samarskogo Gosudarstvennogo Tehničeskogo Universiteta. Seriâ: Fiziko-Matematičeskie Nauki, 2014
Using the first three terms of Taylor expansion of the required function in the approximate derivative by finite differences leads to the second order approximation of the traditional numerical quadrature method of boundary value problems for linear ...
Vladimir N Maklakov
doaj   +1 more source

Solutions of the Schrödinger equation with Hulthén-screened Kratzer potential: Application to Diatomic Molecules

East European Journal of Physics, 2022
In this study, the Schrödinger equation with the Hulthén plus screened Kratzer potentials (HSKP) are solved via the Nikiforov-Uvarov (NU) and the series expansion methods.
Etido Inyang, P.C. Iwuji, Joseph E. Ntibi, E.S. William, E.A. Ibanga   +4 more
doaj   +1 more source

Approximation properties of multivariate exponential sampling series

Carpathian Mathematical Publications, 2021
In this paper, we generalize the family of exponential sampling series for functions of $n$ variables and study their pointwise and uniform convergence as well as the rate of convergence for the functions belonging to space of $\log$-uniformly continuous
S. Kursun, M. Turgay, O. Alagöz, T. Acar   +3 more
semanticscholar   +1 more source

Prediction of volcanic fractures based on prestack azimuthal anisotropy: A case study of LFS area in southern Songliao Basin [PDF]

Youqicang pingjia yu kaifa
Anisotropic parameter inversion based on pre-stack azimuth gather seismic data is one of the primary methods for fracture prediction, among which two algorithms, RüGER approximate equation and Fourier series expansion, are more widely used.
LI Ning,MIAO He,CAO Kaifang
doaj   +3 more sources

Approximation of functions of several variables by multidimensional $S$-fractions with independent variables

Karpatsʹkì Matematičnì Publìkacìï, 2021
The paper deals with the problem of approximation of functions of several variables by branched continued fractions. We study the correspondence between formal multiple power series and the so-called "multidimensional $S$-fraction with independent ...
R.I. Dmytryshyn, S.V. Sharyn
doaj   +1 more source