Results 211 to 220 of about 2,516,127 (237)

Boundedness of pseudo-differential operators via coupled fractional Fourier transform

Applicable Analysis
Kanailal Mahato, Sourav Das, Shraban Das
exaly   +2 more sources

Short-time coupled fractional Fourier transform and asymptotic behaviour of distributions

Integral Transforms and Special Functions
Katerina Hadzi-Velkova Sâneva, Astrit Ferizi   +1 more
exaly   +2 more sources

Fractional Fourier Transform: Main Properties and Inequalities [PDF]

Mathematics, 2023
The fractional Fourier transform is a natural generalization of the Fourier transform. In this work, we recall the definition of the fractional Fourier transform and its relation to the conventional Fourier transform.
Samsul Ariffin Abdul Karim, Mawardi Bahri, Abdul Karim Samsul Ariffin   +2 more
exaly   +2 more sources

Asymmetric multiple-image encryption based on coupled logistic maps in fractional Fourier transform domain

Optics and Lasers in Engineering, 2014
Abstract A multiple-image encryption scheme is proposed based on the asymmetric technique, in which the encryption keys are not identical to the decryption ones. First, each plain image is scrambled based on a sequence of chaotic pairs generated with a system of two symmetrically coupled identical logistic maps.
Liansheng Sui, Kuaikuai Duan, Junli Liang, Zhiqiang Zhang, Haining Meng   +4 more
openaire   +1 more source

Comprehensive Compositional and Structural Comparison of Coal and Petroleum Asphaltenes Based on Extrography Fractionation Coupled with Fourier Transform Ion Cyclotron Resonance MS and MS/MS Analysis

Energy & Fuels, 2020
A recently developed extrography separation method fractionates petroleum asphaltenes based on their ionization efficiency, which correlates with polarity, aggregation tendency, and asphaltene stru...
Sydney F. Niles, Martha L. Chacón-Patiño, Donald F. Smith, Ryan P. Rodgers, Alan G. Marshall   +4 more
openaire   +1 more source

Online coupling of thermal field-flow fractionation and Fourier transform infrared spectroscopy as a powerful tool for polymer characterization

Journal of Chromatography A, 2019
The rapid growth and increasing importance of complex polymers has accelerated the need for advancement in characterization techniques. The analysis of such materials is challenging and the determination of different molecular parameters requires the combination of different advanced analytical techniques.
N.W. Radebe, T. Beskers, G. Greyling, H. Pasch   +3 more
openaire   +2 more sources

A robust and efficient SAR ATR algorithm using a hybrid model of fractional fourier transform and pulse coupled neural network

2014 IEEE International Microwave and RF Conference (IMaRC), 2014
A hybrid framework consisting of Fractional Fourier Transform (FrFT) and Pulse coupled Neural network (PCNN) is proposed in this paper for highly accurate and orientation, position & scale invariant synthetic aperture radar (SAR) automatic target recognition (ATR).
Santu Sardar, Amit K. Mishra
openaire   +1 more source

Fractionation of Asphaltene by Adsorption onto Silica and Chemical Characterization by Atmospheric Pressure Photoionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry, Fourier Transform Infrared Spectroscopy Coupled to Attenuated Total Reflectance, and Proton Nuclear Magnetic Resonance

Energy & Fuels, 2016
Asphaltenes are defined as the petroleum fraction insoluble in n-alkanes and soluble in aromatic solvents, such as toluene. Such definition implies that asphaltenes are not a homogeneous material but a mixture of fractions. Asphaltenes represent one of the major contributors to several problematic issues for the petroleum industry.
Priscila T. H. Nascimento, Alexandre F. Santos, Carlos I. Yamamoto, Lilian V. Tose, Eliane V. Barros, Gustavo R. Gonçalves, Jair C. C. Freitas, Boniek G. Vaz, Wanderson Romão, Agnes P. Scheer   +9 more
openaire   +1 more source

Atmospheric Pressure Photoionization Coupled to Fourier Transform Ion Cyclotron Resonance Mass Spectrometry To Characterize Asphaltene Deposit Solubility Fractions: Comparison to Bulk Properties

Energy & Fuels, 2016
In the present work, a field deposit, the solubility fractions, and heptane-precipitated asphaltenes from the crude oil were analyzed using atmospheric pressure photoionization coupled to Fourier transform ion cyclotron resonance mass spectrometry (APPI FT-ICR MS).
Estrella Rogel, Matthias Witt
openaire   +1 more source

Pseudo-differential operators associated with the coupled fractional Fourier transform and its application

Journal of Pseudo-Differential Operators and Applications
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Das, Shraban, Mahato, Kanailal
openaire   +2 more sources