Results 221 to 230 of about 2,516,127 (237)

Sample handling and contamination encountered when coupling offline normal phase high performance liquid chromatography fraction collection of petroleum samples to Fourier transform ion cyclotron resonance mass spectrometry

Analytica Chimica Acta, 2012
Normal phase high performance liquid chromatography (HPLC) is used to separate a gas oil petroleum sample, and the fractions are collected offline and analyzed on a high resolution Fourier Transform Ion Cyclotron Resonance Mass Spectrometer (FT-ICR MS).
Nicole E, Oro, Randy M, Whittal, Charles A, Lucy   +2 more
openaire   +2 more sources

Mathematical analysis of a time-fractional coupled tumour model using Laplace and finite Fourier transforms

Physica Scripta
Abstract A time-fractional diffusive tumour growth model is investigated in this paper. The model assumes two different tumour populations having diverse diffusion and proliferation rates. The classical integer model, coupled with the fractional operators with power-law, Mittag-Leffler and exponential kernels is solved analytically with ...
Sadia Munir, Andrew Omame, Fiazud Din Zaman   +2 more
openaire   +1 more source

Atmospheric Pressure Photoionization and Laser Desorption Ionization Coupled to Fourier Transform Ion Cyclotron Resonance Mass Spectrometry To Characterize Asphaltene Solubility Fractions: Studying the Link between Molecular Composition and Physical Behavior

Energy & Fuels, 2015
In the present work, a series of asphaltene solubility fractions extracted from a heavy crude oil have been analyzed using laser desorption ionization (LDI) and atmospheric pressure photoionization (APPI) coupled to Fourier transform ion cyclotron resonance mass spectrometry.
Estrella Rogel, Michael Moir, Matthias Witt   +2 more
openaire   +1 more source

Characterization of Middle-Temperature Gasification Coal Tar. Part 2: Neutral Fraction by Extrography Followed by Gas Chromatography–Mass Spectrometry and Electrospray Ionization Coupled with Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Energy & Fuels, 2012
A commercial lignite gasification-derived middle-temperature coal tar (MTCT) was subjected to acid–base extraction to obtain acidic, basic, and neutral fractions. The neutral fraction was characterized by mass spectrometry (MS) for hydrocarbon-group-type analysis and further fractionated by extrography into six subfractions, which were characterized by
Haiyang Long, Quan Shi, Na Pan, Yahe Zhang, Dechun Cui, Keng H. Chung, Suoqi Zhao, Chunming Xu   +7 more
openaire   +1 more source

On the extension of the coupled fractional Fourier transform and its properties

Integral Transforms and Special Functions, 2021
R. Kamalakkannan, R. Roopkumar, A. Zayed
openaire   +1 more source

Quaternionic Coupled Fractional Fourier Transform on Boehmians

2023
R. Kamalakkannan, R. Roopkumar, A. Zayed
openaire   +1 more source

TWO NEW RELATIONS FOR THE COUPLED FRACTIONAL FOURIER TRANSFORM

Journal of Southwest Jiaotong University, 2023
openaire   +1 more source

On the extension of the coupled fractional Fourier transform and its properties

Integral Transforms and Special Functions, 2022
Roopkumar Rajakumar, Ahmed I. Zayed
exaly  

P14799_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

2021
Amy M. Mckenna, Sydney Niles, Dr Martha Liliana Chacon-Patino, Ryan Rodgers   +3 more
openaire   +1 more source

Fractional Fourier transform: Time-frequency representation and structural instantaneous frequency identification

Mechanical Systems and Signal Processing, 2022
Lian Lu
exaly