Quaternion Fourier Transform spectral analysis of electrical currents for bearing faults detection and diagnosis

2022 ◽  
Vol 168 ◽  
pp. 108656
Author(s):  
Léandre Egole Rikam ◽  
Laurent Bitjoka ◽  
Alexandre Nketsa
Keyword(s):  
Spectral Analysis ◽  
Fourier Transform ◽  
Quaternion Fourier Transform ◽  
Electrical Currents ◽  
Bearing Faults ◽  
Detection And Diagnosis

scholarly journals SYNTHESIS, CHARACTERIZATION, AND ANTHELMINTIC ACTIVITY OF NOVEL BENZOTHIAZOLE DERIVATIVES CONTAINING INDOLE MOIETIES

2019 ◽  
pp. 321-325
Author(s):  
ALETI RAJAREDDY ◽  
SRINIVAS MURTHY M
Keyword(s):  
Spectral Analysis ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Magnetic Resonance ◽  
Fourier Transform Infrared Spectroscopy ◽  
Anthelmintic Activity ◽  
Mass Spectral Analysis ◽  
Standard Drug ◽  
Mass Spectral ◽  
Benzothiazole Derivatives

Objective: The objective of this study was to synthesize and evaluate the anthelmintic activity (AA) of novel benzothiazole derivatives containing indole moieties (BDIM). Methods: The present works which involve the substituted isatin Schiff bases undergo acetylating and reacting with 2-aminobenzothiazole to give novel BDIM. Results: All the newly synthesized molecules (5a-5o) were characterized by Fourier-transform infrared spectroscopy, H_nuclear magnetic resonance, and mass spectral analysis along with physical data. The biological potentials of the newly synthesized compounds are evaluated for their AA using an Indian earthworm (Pheretima posthuma), and albendazole was used as standard drug. Conclusion: The synthesized compound 5f, 5n, and 5o showed good AA, whereas others exhibited significant activities.

Spectral analysis for GNSS coordinate time series using chirp Fourier transform

2017 ◽  
Vol 65 (6) ◽  
pp. 1111-1118
Author(s):  
Shengtao Feng ◽  
Wanju Bo ◽  
Qingzun Ma ◽  
Zifan Wang
Keyword(s):  
Time Series ◽  
Spectral Analysis ◽  
Fourier Transform ◽  
Coordinate Time ◽  
Coordinate Time Series

scholarly journals Spectral Analysis of Traffic Functions in Urban Areas

2015 ◽  
Vol 27 (6) ◽  
pp. 477-484 ◽  
Author(s):  
Florin Nemtanu ◽  
Ilona Madalina Costea ◽  
Catalin Dumitrescu
Keyword(s):  
Spectral Analysis ◽  
Fourier Transform ◽  
Fourier Analysis ◽  
Traffic Flow ◽  
Traffic Control ◽  
Urban Areas ◽  
Urban Traffic ◽  
The Fourier Transform ◽  
The City ◽  
Different Time Scales

The paper is focused on the Fourier transform application in urban traffic analysis and the use of said transform in traffic decomposition. The traffic function is defined as traffic flow generated by different categories of traffic participants. A Fourier analysis was elaborated in terms of identifying the main traffic function components, called traffic sub-functions. This paper presents the results of the method being applied in a real case situation, that is, an intersection in the city of Bucharest where the effect of a bus line was analysed. The analysis was done using different time scales, while three different traffic functions were defined to demonstrate the theoretical effect of the proposed method of analysis. An extension of the method is proposed to be applied in urban areas, especially in the areas covered by predictive traffic control.

Donoho–Stark’s uncertainty principle for the quaternion Fourier transform

2019 ◽  
Vol 26 (2) ◽  
pp. 587-597 ◽  
Author(s):  
A. Abouelaz ◽  
A. Achak ◽  
R. Daher ◽  
N. Safouane
Keyword(s):  
Fourier Transform ◽  
Uncertainty Principle ◽  
Quaternion Fourier Transform
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