Results 1 to 10 of about 8,995,831 (132)
The multipliers of multiple trigonometric Fourier series
Open Engineering, 2016 Abstract We study the multipliers of multiple Fourier series for a regular system on anisotropic Lorentz spaces. In particular, the sufficient conditions for a sequence of complex numbers {λk}k∈Zn in order to make it a multiplier of multiple trigonometric Fourier series from Lp[0; 1]n to Lq[0; 1]n , p > q.
Lyazzat Sarybekova
exaly +4 more sources
ON Λ-CONVERGENCE ALMOST EVERYWHERE OF MULTIPLE TRIGONOMETRIC FOURIER SERIES [PDF]
Ural mathematical journal, 2017 Let \(\Lambda=\{\lambda_{ \nu}\}_{\nu=1}^{\infty}\) be a nonincreasing sequence of positive numbers. Set \[ \Omega_{\Lambda}=\{\mathfrak{n}=(n^1, n^2, \dots, n^d)\in\mathbb{N}^d:\, \frac{1}{1+\lambda_{n^i}}\leq \frac{n^i}{n^j}\leq 1+\lambda_{n^j}, \,\, 1\leq i, j\leq d\}. \] We will say that a multiple Fourier series of a function \(f\in L(\mathfrak{T}^
Nikolai Yu. Antonov +2 more
openaire +14 more sources
Equiconvergence of expansions in multiple trigonometric Fourier series and Fourier integral with "Jk-lacunary sequences of rectangular partial sums" [PDF]
Acta et Commentationes Universitatis Tartuensis de Mathematica, 2014 We give a review of recent results on equiconvergence of expansions in multiple trigonometric Fourier series and Fourier integral in the case of summation over rectangles.
Igor L. Bloshanskii, Denis A. Grafov
openaire +3 more sources
Comparative Performance of Mechanistic, Statistical, and Hybrid Models of Forecasting Dengue Fever Incidence in Somalia. A Retrospective Time Series Analysis. [PDF]
Health Sci RepABSTRACT Background and Aims Dengue fever is a growing menace in Somalia, a climate change prone region with a weak healthcare system. An imperative of public health is effective forecasting models. This paper will provide a detailed comparative analysis comparing mechanistic, statistical, and hybrid models in order to find the best forecasting model ...
Abdi AM, Nadarajah S, Muse AH.
europepmc +2 more sources
Concerning the multiplicators of fourier series in the trigonometric system [PDF]
Mathematical Notes, 1998 The author proves two theorems on the boundedness (in the norm of \(L_p(\mathbb{T}^n)\)) of the partial sums of Fourier series and three theorems on Fourier multipliers in \(L_p(\mathbb{T}^n)\). As a pattern, here we present Theorem 5.
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FinTech and Environmental Sustainability: Evidence From Brazil
Sustainable Development, EarlyView.ABSTRACT This study explores the dynamic interplay between economic growth and environmental sustainability from a FinTech perspective, using Brazil as a case study. While FinTech's contribution to green transformation, sustainable finance, and resource efficiency has gained increasing attention, a notable lack of empirical research remains to assess ...
Kemal Eyuboglu, Umut Uzar
wiley +1 more source
Real Analysis Exchange, 2016 Sufficient conditions for the convergence (almost everywhere) of multiple trigonometric Fourier series of functions $f$ in the classes $L_p$, $p>1$, are obtained in the case where rectangular partial sums $S_n(x;f)$ of this series have numbers $n=(n_1,\dots,n_N)\in \mathbb Z^N$, $N\geq 3$, such that of $N$ components only $k$ ($1\leq k\leq N-2$) are ...
Bloshanskii, Igor L., Grafov, Denis A.
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Tracking SDG‐7 in China, India, and Japan
Sustainable Development, EarlyView.ABSTRACT This study examines the impact of clean energy consumption on environmental quality, supporting the UN Sustainable Development Goal (SDG) 7, which aims to ensure access to clean, affordable energy for all. The Auto‐Regressive Distributed Lag (ARDL) model is used for Japan, and the Fourier ARDL for China and India, followed by a Granger ...
Arvind Goswami +3 more
wiley +1 more source
Sustainable Development, EarlyView.ABSTRACT Understanding whether the interaction between economic activity and forest ecosystems manifests as conflict or synergy is central to designing effective, sustainable development policies. Although the environmental Kuznets curve framework is frequently utilized to explain this relationship, its analytical scope remains limited, as it ...
Umut Uzar, Kemal Eyuboglu
wiley +1 more source
High Voltage, EarlyView.ABSTRACT The alternate arm converter (AAC) is one of the most efficient multilevel topologies based on voltage source converters (VSCs), which has recently gained attention in various applications, particularly in high voltage direct current (HVDC) systems.
Ehsan Akbari, Milad Samady Shadlu
wiley +1 more source