Results 21 to 30 of about 1,236,961 (324)

Propagation of shock wave of nitrogen gas in Titan stratosphere

open access: yesJournal of Taibah University for Science, 2021
Nitrogen gas is considered one of the significant standard gases in stratosphere of Titan, Saturn's largest moon, which represents almost 98.4% of Titan atmosphere chemical composites.
H. G. Abdelwahed, Abeer A. Mahmoud
doaj   +1 more source

Operator-valued zeta functions and Fourier analysis [PDF]

open access: yes, 2019
The Riemann zeta function $\zeta(s)$ is defined as the infinite sum $\sum_{n=1}^\infty n^{-s}$, which converges when ${\rm Re}\,s>1$. The Riemann hypothesis asserts that the nontrivial zeros of $\zeta(s)$ lie on the line ${\rm Re}\,s= \frac{1}{2}$. Thus,
Bender, Carl M., Brody, Dorje C
core   +2 more sources

Clifford algebras, Fourier transforms and quantum mechanics [PDF]

open access: yes, 2012
In this review, an overview is given of several recent generalizations of the Fourier transform, related to either the Lie algebra sl_2 or the Lie superalgebra osp(1|2).
De Bie, Hendrik
core   +2 more sources

Forecasting Inflation Based on Hybrid Integration of the Riemann Zeta Function and the FPAS Model (FPAS + ζ): Cyclical Flexibility, Socio-Economic Challenges and Shocks, and Comparative Analysis of Models [PDF]

open access: yesSocioEconomic Challenges
Inflation forecasting is one of the main socio-economic challenges in modern macroeconomic modeling, especially when cyclical, structural, and shock factors act simultaneously in the system. Traditional forecasting systems, such as Forecasting and Policy
Davit Gondauri
doaj   +1 more source

The cylindrical Fourier transform [PDF]

open access: yes, 2010
In this paper we devise a so-called cylindrical Fourier transform within the Clifford analysis context. The idea is the following: for a fixed vector in the image space the level surfaces of the traditional Fourier kernel are planes perpendicular to that
A. Erdélyi   +5 more
core   +2 more sources

Nonlinear Fourier analysis [PDF]

open access: yesBulletin of the American Mathematical Society, 1989
The author gives an introduction to nonlinear Fourier analysis which can be described as the study of nonlinear functions (often in infinite dimensional Banach spaces) by techniques from or inspired by Fourier analysis. Roughly speaking his survey covers the ground from the proof of Coifman-McIntosh-Meyer that the Cauchy integral on Lipschitz curves is
openaire   +4 more sources

Ophthalmic Bioengineering. Review

open access: yesOftalʹmologiâ, 2023
This article published the materials of the round table “Bioengineering in ophthalmology” (OphthalmicBioengineering), held on May 13, 2021 as part of the international conference Ural Symposium on Biomedical Engineering, Radioelectronics and Information ...
V. O. Ponomarev   +11 more
doaj   +1 more source

Pseudorandomness for Regular Branching Programs via Fourier Analysis [PDF]

open access: yes, 2013
We present an explicit pseudorandom generator for oblivious, read-once, permutation branching programs of constant width that can read their input bits in any order. The seed length is $O(\log^2 n)$, where $n$ is the length of the branching program.
A. Healy   +11 more
core   +1 more source

Development of a fast fourier transform-based analytical method for COVID-19 diagnosis from chest X-ray images using GNU octave

open access: yesJournal of Medical Physics, 2022
Purpose: Many artificial intelligence-based computational procedures are developed to diagnose COVID-19 infection from chest X-ray (CXR) images, as diagnosis by CXR imaging is less time consuming and economically cheap compared to other detection ...
Durjoy Majumder
doaj   +1 more source

Spectral analysis and the death of value investing

open access: yesCogent Economics & Finance, 2021
This study explores the redundancy of the value premium by conducting a Fourier analysis. The results illustrate periodicity in the value premium and merges the Adaptive Market Hypothesis with the Efficient Market hypothesis.
John-Morgan Bezuidenhout   +1 more
doaj   +1 more source

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