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9 results on '"Hung, Nguyen Khanh"'

4. Determination of saturated fat, unsaturated fat, and transfat in commercial instant noodles based on the analysis of fatty acid composition by gas chromatography

Author

Hung, Nguyen Khanh, Trang, Nguyen Phuong, and Du, Nguyen Huy

Abstract

In the food processing sector, it is crucial to identify the composition and fat content of items that have undergone heat‐processing. The total fat content is the primary factor used to determine the fat content of instant noodle products. As a result, a technique must be developed to identify fat content by determination of fatty acid composition, particularly transfatty acids. In this study, we used the reliable GC‐FID/MS technique to analyze the methyl ester derivatives of 37 different kinds of fatty acids. The results showed that high saturated fat concentration in all samples was mostly palmitic acid, whereas the low unsaturated fatty acid content in the cisform was primarily oleic acid and linoleic acid. The amount of monounsaturated and polyunsaturated fats is quite low. Transfat level was almost non‐existent in all samples. The amounts of palmitic acid and oleic acid in the samples ranged from 4.10% to 12.84% and 2.62% to 7.65%, respectively, as did linoleic acid and stearic acid. Monounsaturated and polyunsaturated fatty acid concentration ranged from 2.62% to 7.82% and 0.52 to 1.81%, respectively. The proportion of polyunsaturated fat to saturated fat was quite low. Therefore, it is essential to have procedures in place to keep an eye on the saturated fatty acid level, which has a negative impact on consumers' health. The findings of experimental research demonstrated that transfatty acids were not present in instant noodle products. It revealed that the food processing sector has advanced favorably and catered to the demands of both the domestic and international markets.

Published
2023
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5. Preparation of a Key Tetraene Precursor for the Synthesis of Long Acenes

Author

Levet, Gaspard, Hung, Nguyen Khanh, Šámal, Michal, Rybáček, Jiří, Císařová, Ivana, Jancarik, Andrej, Gourdon, André, Groupe NanoSciences (CEMES-GNS), Centre d'élaboration de matériaux et d'études structurales (CEMES), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Charles Univ Prague, Fac Sci, Dept Inorgan Chem, Charles University [Prague] (CU), The Foundation EXPERIENTIAERDF/ESF 'UOCHB MSCA Mobility' (No. CZ.02.2.69/0.0/0.0/17_050/0008490), ORQUID, MQWIRES, PASIMOD, Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)

Subjects
carboxylation, ozonolysis, [CHIM.ORGA]Chemical Sciences/Organic chemistry, tetraene, cycloaddition, protecting group
Abstract

International audience; The tetraene 7,7-dimethoxy-2,3,5,6-tetramethylenebicyclo[2.2.1]heptane is a key compound for the preparation of a large variety of acenes protected by a carbonyl bridge. We report here a medium scale preparation in seven steps of this valuable starting material. Diels-Alder addition between 6,6-dimethyl fulvene and maleic anhydride, followed by carboxylation, ozonolysis of the double bond, reduction of the four ester group, then chlorination of the alcohol groups and dehydrochlorination give the target compound in 17% overall yield.

Published
2020

6. Agent-based simulation of contract rice farming in the Mekong Delta, Vietnam

Author

Richard H. Middleton, Manuel Chica, Raymond Chiong, and Hung Nguyen Khanh

Subjects
Context model, Agriculture, business.industry, Process (engineering), Supply chain, Spot market, Rice farming, Context (language use), Business, Environmental economics, Contract farming
Abstract

We present a contract farming model in the context of rice supply chain in the Mekong Delta, Vietnam, with the use of agent-based simulation. The purpose of the simulation is to understand the motivation of farmers and contractors in their participation into the contract rice farming scheme. The decision-making process is based on two main factors: cost-benefit analysis and the role of trust. The context is also extended with the introduction of a spot market in which both parties can renege on the contractual relationship. The simulation model then evaluates the performance of contract farming under different commitment decisions of farmers and contractors.

Published
2017

8. Target tracking system using lateration estimation method in wireless sensor networks

Author

Thu Ngo-Quynh, Hung Nguyen-Khanh, and Vinh Tran-Quang

Subjects
Computer science, business.industry, Real-time computing, Tracking system, Kalman filter, Energy consumption, Tracking (particle physics), Invariant extended Kalman filter, Extended Kalman filter, Trajectory, Computer vision, Artificial intelligence, business, Wireless sensor network
Abstract

A tracking system can track a moving target, report to the Base Station (BS) and predict the wake-up zone while considering the trade-off between energy consumption and the accuracy of tracking performance. To estimate and predict the trajectory of a dynamic target, the use of Bayesian filter, Kalman filter and its derivations are proposed in [1]. The implementation of these different filters for a tracking system is also analysed. In this paper, we propose a new method to estimate the trajectory of a target: Lateration estimation. We then continue to simulate and analyse the performance of this method and compare to extended Kalman filter (EKF) in term of residual energy and tracking accuracy. Simulation results show that the Lateration estimation method can achieve better energy consumption while maintaining reasonable tracking performance.

Published
2013

9. Target tracking system using lateration estimation method in wireless sensor networks.

Author

Vinh Tran-Quang, Hung Nguyen-Khanh, and Thu Ngo-Quynh

Abstract

A tracking system can track a moving target, report to the Base Station (BS) and predict the wake-up zone while considering the trade-off between energy consumption and the accuracy of tracking performance. To estimate and predict the trajectory of a dynamic target, the use of Bayesian filter, Kalman filter and its derivations are proposed in [1]. The implementation of these different filters for a tracking system is also analysed. In this paper, we propose a new method to estimate the trajectory of a target: Lateration estimation. We then continue to simulate and analyse the performance of this method and compare to extended Kalman filter (EKF) in term of residual energy and tracking accuracy. Simulation results show that the Lateration estimation method can achieve better energy consumption while maintaining reasonable tracking performance. [ABSTRACT FROM PUBLISHER]

Published
2013
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