Relevant bibliographies by topics / Fourier trans-formation

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  2. Dissertations / Theses

Academic literature on the topic 'Fourier trans-formation'

Author: Grafiati
Published: 28 June 2021
Last updated: 29 July 2025

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Journal articles on the topic "Fourier trans-formation"

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Sarfaraz Ahmed Mahesar, Sarfaraz Ahmed Mahesar, Taimoor Hassan Shaikh Taimoor Hassan Shaikh, Zahid Hussain Shar Ghulam Abbas Kandhro Zahid Hussain Shar Ghulam Abbas Kandhro, and Abdul Rauf Khaskheli and Syed Tufail Hussain Sherazi Abdul Rauf Khaskheli and Syed Tufail Hussain Sherazi. "Evaluation of Trans Fat in Vermicelli by Fourier Transform Infrared Spectroscopy in Combination with Chemometric Technique." Journal of the chemical society of pakistan 42, no. 3 (2020): 468. http://dx.doi.org/10.52568/000642.

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Since there is limited knowledge about trans fat levels in snack foods available in Pakistan. This study aimed to determine trans fat content in fried vermicelli (a common snack food). It is prepared in partially hydrogenated oil (ghee), which is the main cause of trans fat formation. Twenty-one fried vermicelli samples were collected from different local shops of Hyderabad, Pakistan and subjected to oil extraction by using Soxhlet method. Partial least square regression model was developed to quantify trans fats in fried vermicelli using FTIR spectroscopy. Total oil content in fried vermicell
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Sarfaraz Ahmed Mahesar, Sarfaraz Ahmed Mahesar, Taimoor Hassan Shaikh Taimoor Hassan Shaikh, Zahid Hussain Shar Ghulam Abbas Kandhro Zahid Hussain Shar Ghulam Abbas Kandhro, and Abdul Rauf Khaskheli and Syed Tufail Hussain Sherazi Abdul Rauf Khaskheli and Syed Tufail Hussain Sherazi. "Evaluation of Trans Fat in Vermicelli by Fourier Transform Infrared Spectroscopy in Combination with Chemometric Technique." Journal of the chemical society of pakistan 42, no. 3 (2020): 468. http://dx.doi.org/10.52568/000642/jcsp/42.03.2020.

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Since there is limited knowledge about trans fat levels in snack foods available in Pakistan. This study aimed to determine trans fat content in fried vermicelli (a common snack food). It is prepared in partially hydrogenated oil (ghee), which is the main cause of trans fat formation. Twenty-one fried vermicelli samples were collected from different local shops of Hyderabad, Pakistan and subjected to oil extraction by using Soxhlet method. Partial least square regression model was developed to quantify trans fats in fried vermicelli using FTIR spectroscopy. Total oil content in fried vermicell
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Ortega, Jose, Arturo Martínez Zavala, Maribel Hernández, and Joel Díaz Reyes. "Analysis of trans fatty acids production and squalene variation during amaranth oil extraction." Open Chemistry 10, no. 6 (2012): 1773–78. http://dx.doi.org/10.2478/s11532-012-0104-4.

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AbstractThe purpose of this study was to evaluate the decay of squalene and the formation of trans fatty acids (TFAs) in the amaranth oil extracted with hexane with and without heat. Oils were analyzed by determining their chemical values, and the fatty acids were identified and quantified by using Fourier-transform infrared (FTIR) spectroscopy, in the mid-region of 400–4000 cm−1, and gas chromatography. The FTIR analysis shows that two oil extracts (with and without heat) present a well-defined peak at 968 cm−1, which represents the trans double bonds. The quantified TFAs are
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Johnson, W. C., and B. J. Lyons. "Radiolytic formation and decay of trans-vinylene unsaturation in polyethylene: Fourier transform infra-red measurements." Radiation Physics and Chemistry 46, no. 4-6 (1995): 829–32. http://dx.doi.org/10.1016/0969-806x(95)00271-x.

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Antiñolo, María, María Asensio, José Albaladejo, and Elena Jiménez. "Gas-Phase Reaction of trans-2-Methyl-2-butenal with Cl: Kinetics, Gaseous Products, and SOA Formation." Atmosphere 11, no. 7 (2020): 715. http://dx.doi.org/10.3390/atmos11070715.

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The gas-phase reaction between trans-2-methyl-2-butenal and chlorine (Cl) atoms has been studied in a simulation chamber at 298 ± 2 K and 760 ± 5 Torr of air under free-NOx conditions. The rate coefficient of this reaction was determined as k = (2.45 ± 0.32) × 10−10 cm3 molecule−1 s−1 by using a relative method and Fourier transform infrared spectroscopy. In addition to this technique, gas chromatography coupled to mass spectrometry and proton transfer time-of-flight mass spectrometry were used to detect and monitor the time evolution of the gas-phase reaction products. The major primary react
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Kalalian, Carmen, Asma Grira, Jan Niklas Illmann, et al. "Experimental and Theoretical Studies of Trans-2-Pentenal Atmospheric Ozonolysis." Atmosphere 13, no. 2 (2022): 291. http://dx.doi.org/10.3390/atmos13020291.

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We investigated the kinetics, mechanism and secondary organic aerosols formation of the ozonolysis of trans-2-pentenal (T2P) using four different reactors with Fourier Transform InfraRed (FTIR) spectroscopy and Gas Chromatography (GC) techniques at T = 298 ± 2 K and 760 Torr in dry conditions. The rate coefficients and branching ratios were also evaluated using the canonical variational transition (CVT) state theory coupled with small curvature tunneling (CVT/SCT) in the range 278–350 K. The experimental rate coefficient at 298 K was (1.46 ± 0.17) × 10−18 cm3 molecule−1 s−1, in good agreement
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García-González, Diego L., and Frederik R. Van De Voort. "A Novel Wire Mesh “Cell” for Studying Lipid Oxidative Processes by Fourier Transform Infrared Spectroscopy." Applied Spectroscopy 63, no. 5 (2009): 518–27. http://dx.doi.org/10.1366/000370209788346995.

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A novel infrared (IR) sample handling accessory has been developed to monitor and study oxidation processes of edible oils under moderate temperature conditions by Fourier transform infrared (FT-IR) spectroscopy. A reusable stainless steel mesh IR “cell” was designed and evaluated from the standpoint of mesh size, transmission characteristics, its ability to entrap oil, and techniques to apply sample and normalize path length so as to obtain good quality, reproducible spectra. The concept is to entrap oil within the mesh by means of its inherent surface tension and to take advantage of the hig
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Ito, Fumiyuki. "Observation of Light-Induced Reactions of Olefin–Ozone Complexes in Cryogenic Matrices Using Fourier-Transform Infrared Spectroscopy." Photochem 2, no. 1 (2022): 150–64. http://dx.doi.org/10.3390/photochem2010012.

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Each olefin (ethylene, trans-1,3-butadiene, isoprene, dimethyl butadiene (DMB)) and ozone molecules were codeposited on a CsI window at cryogenic temperature, and the products of photolysis with ultraviolet–visible light were observed using Fourier-transform infrared spectroscopy. The products of the C2H4–O3 system could be assigned to glyoxal (CHO–CHO), ethylene oxide (c–C2H4O), CO, and CO2. The formation of CHO–CHO and c–C2H4 and the absence of H2CO and HCOOH indicated that the main reaction channels did not involve C–C bond breaking. Based on this simple scheme, the photoproducts of differe
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Clark, Peter D., James F. Fait, Colin G. Jones, and Martin J. Kirk. "Reactions of benzo[b]thiophene with some aqueous platinum metal species at elevated temperatures." Canadian Journal of Chemistry 69, no. 4 (1991): 590–98. http://dx.doi.org/10.1139/v91-089.

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The desulfurization of benzo[b]thiophene 1 with aqueous transition metal species in the presence of various hydrocarbons at elevated temperatures is described. Mechanistic studies have shown that treatment of 1 with solutions of RuCl3 and other platinum metal species results in the formation of 2,3-dihydrobenzo[b]thiophene 2 and ethylbenzene 3 as major products. Metal coordinated species are probable intermediates in the formation of 2 and hydrocarbon products. 2 readily coordinates to PdCl2 to form square-planar trans-dichlorobis(2,3-dihydrobenzo[b]thiophene) palladium(II), which decomposes t
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Chawananon, Sathapana, Pierre Asselin, Jordan A. Claus, et al. "Rovibrational Spectroscopy of Trans and Cis Conformers of 2-Furfural from High-Resolution Fourier Transform and QCL Infrared Measurements." Molecules 28, no. 10 (2023): 4165. http://dx.doi.org/10.3390/molecules28104165.

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The ortho-isomer 2-furfural (2-FF), which is a primary atmospheric pollutant produced from biomass combustion, is also involved in oxidation processes leading to the formation of secondary organic aerosols. Its contribution to radiative forcing remains poorly understood. Thus, monitoring 2-FF directly in the atmosphere or in atmospheric simulation chambers to characterize its reactivity is merited. The present study reports an extensive jet-cooled rovibrational study of trans and cis conformers of 2-FF in the mid-IR region using two complementary setups: a continuous supersonic jet coupled to
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Dissertations / Theses on the topic "Fourier trans-formation"

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Nwaokocha, Martyns. "Shorův algoritmus v kvantové kryptografii." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-445457.

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Kryptografie je velmi důležitým aspektem našeho každodenního života, protože poskytuje teoretický základ informační bezpečnosti. Kvantové výpočty a informace se také stávají velmi důležitou oblastí vědy kvůli mnoha aplikačním oblastem včetně kryptologie a konkrétněji v kryptografii veřejných klíčů. Obtížnost čísel do hlavních faktorů je základem některých důležitých veřejných kryptosystémů, jejichž klíčem je kryptosystém RSA . Shorův kvantový faktoringový al-goritmus využívá zejména kvantový interferenční účinek kvantového výpočtu k faktorovým semi-prime číslům v polynomiálním čase na kvantové
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Tsao, Yu-Hsuan, and 曹育瑄. "HCl Formation in the Reaction of Cl Atom with trans-2-butene Investigated with Step-scan Time-resolved Fourier-transform Infrared Emission Spectroscopy." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/saxz29.

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碩士<br>國立交通大學<br>應用化學系碩博士班<br>108<br>Reactions between chlorine atoms and unsaturated hydrocarbons play important roles in atmosphere chemistry. In the marine boundary layer and polluted coastal areas, chlorine atom reactions with alkenes produce alkyl or alkenyl radicals, which may further react with O_2 and become potential contributors to secondary organic aerosols. In the reaction, HCl is produced from either direct abstraction of an allylic hydrogen atom by the chlorine atom or addition-elimination, in which the chlorine atom first adds to the C=C double bond to form a chloroalkyl radical,
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