Results 21 to 30 of about 3,891 (249)

Numerical analysis of light transmission in dual-core waveguides [PDF]

open access: yes, 2023
We use a pseudo-spectral Fast Fourier Transform method on MATLAB to study solitary wave solutions for fractional, coupled non-linear Schrödinger equations and find novel stability boundaries associated with solution symmetry within the fractional ...
McKeiver, Joshua
core   +1 more source

Development of dispersive solid-phase microextraction coupled with high-pressure liquid chromatography for the preconcentration and determination of the selected neonicotinoid insecticides

open access: yesJournal of Analytical Science and Technology, 2022
Neonicotinoid insecticides have raised a lot of societal concerns due to their environmental ubiquity and unique mode of action. Therefore, it is of great research interest to monitor their occurrence in the environmental waters. However, these compounds
Ngwako Joseas Waleng   +3 more
doaj   +1 more source

Magnetic Solid Phase Extraction Based on Nanostructured Magnetic Porous Porphyrin Organic Polymer for Simultaneous Extraction and Preconcentration of Neonicotinoid Insecticides From Surface Water

open access: yesFrontiers in Chemistry, 2020
In this study, a magnetic porphyrin-based porous organic polymer (MP-POP) nanocomposite was successfully synthesized according previous studies and applied as an adsorbent for simultaneous extraction and preconcentration of four neonicotinoid ...
Shirley K. Selahle   +8 more
doaj   +1 more source

Investigation of Island/ Single Core and Archipelago/ Multicore Enriched Asphaltenes and Their Solubility Fractions by Thermal Analysis Coupled to High Resolution Fourier Transform Ion Cyclotron Resonance Mass Spectrometry [PDF]

open access: yesEnergy & Fuels, 2020
Despite extensive research, the molecular-level chemical characterization of asphaltenes, a highly aromatic solubility fraction of petroleum, remains an analytical challenge. This fraction is related to diverse problems in crude oil exploration, transportation, and refining.
Anika Neumann   +4 more
openaire   +2 more sources

Determination of total hydrocarbons in contaminated soil with "Thin Layer Sorptive Extraction coupled with Attenuated Total Reflectance -Fourier Transform Infrared [PDF]

open access: yes, 2020
International audienceSoil analyzing using infrared spectroscopy has been proposed as an alternative to conventional soil analysis to detect soil contamination.
Rocci, Jean-François   +3 more
core   +1 more source

Analytical Solution of Generalized Space-Time Fractional Advection-Dispersion Equation via Coupling of Sumudu and Fourier Transforms [PDF]

open access: yesFrontiers in Physics, 2019
The objective of this article is to present the computable solution of space-time advection-dispersion equation of fractional order associated with Hilfer-Prabhakar fractional derivative operator as well as fractional Laplace operator. The method followed in deriving the solution is that of joint Sumudu and Fourier transforms.
Vinod Gill, Jagdev Singh, Yudhveer Singh
openaire   +2 more sources

On the time-splitting Fourier spectral method for the coupled Klein-Gordon-Schrödinger equations in the quantum field theory [PDF]

open access: yes, 2017
Purpose The purpose of this paper is to consider the time-splitting Fourier spectral (TSFS) method to solve the fractional coupled Klein–Gordon–Schrödinger (K-G-S) equations. A time-splitting spectral approach is applied for discretizing the Schrödinger-
S. Saha Ray
core   +1 more source

Nonlinear differential equations in physics: novel methods for finding solutions [PDF]

open access: yes, 2020
This book discusses various novel analytical and numerical methods for solving partial and fractional differential equations. Moreover, it presents selected numerical methods for solving stochastic point kinetic equations in nuclear reactor dynamics by ...
Saha Ray, Santanu
core   +1 more source

A fast normal splitting preconditioner for attractive coupled nonlinear Schr\"odinger equations with fractional Laplacian [PDF]

open access: yes, 2023
A linearly implicit conservative difference scheme is applied to discretize the attractive coupled nonlinear Schr\"odinger equations with fractional Laplacian.
Cheng, Yan, Yang, Xi
core   +1 more source

A lysing polysaccharide monooxygenase from effectively facilitated rumen microbial fermentation of rice straw [PDF]

open access: yesAnimal Bioscience
Objective This study investigated the impact of Aspergillus niger lysing polysaccharide monooxygenase (AnLPMO) on in vitro rumen microbial fermentation of rice straw. Methods AnLPMO was heterologously expressed in Escherichia coli.
Ting Li   +4 more
doaj   +1 more source

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