Results 231 to 240 of about 69,760 (269)

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

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

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

Investigation on nonlinear and fractional derivative Zener model of coupled vehicle-track system

Vehicle System Dynamics, 2020
The nonlinear and fractional derivative Zener model of viscoelastic material considering Berg’s friction force model is established, which can be used to describe the frequency-dependent and amplitude-dependent behaviour of rubber isolator.
Fan Yang, Ping Wang, Kai Wei, Feng Wang
semanticscholar   +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

A fast normal splitting preconditioner for attractive coupled nonlinear Schroedinger equations with fractional Laplacian

Teoriâ i sistemy upravleniâ
A linearly implicit conservative difference scheme is applied to discretize the attractive coupled nonlinear Schroedinger equations with fractional Laplacian.
Y. Cheng, X. Yang, I. A. Matveev
semanticscholar   +1 more source

Two-Stage Prony-Based Estimation of Fractional Delay and Doppler Shifts in OTFS Modulation

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications
Accurate estimation of fractional delay and Doppler shifts in multipath channels is essential for integrated sensing and communication (ISAC) systems operating in high-mobility environments.
Yutaka Jitsumatsu, Liangchen Sun
semanticscholar   +1 more source

A Multidomain Coupled Spatiotemporal Feature Interaction Model for EEG Emotion Recognition

IEEE Transactions on Instrumentation and Measurement
Electroencephalogram (EEG) is a powerful tool for monitoring the brain’s electrical activity, providing valuable insights into an individual’s emotional state.
Liyun Xu, Xiaofang Xing, Jiang Chang, Pan Lin   +3 more
semanticscholar   +1 more source

Efficient Finite Difference/Spectral Method for the Time Fractional Ito Equation Using Fast Fourier Transform Technic

Communication on Applied Mathematics and Computation, 2022
Dakang Cen, Zhibo Wang, Seakweng Vong
semanticscholar   +1 more source